82 results on '"Adrian Lungu"'
Search Results
2. Review of the Pathologic Characteristics in Myhre Syndrome: Gain-of-Function Pathogenic Variants in SMAD4 cause a Multisystem Fibroproliferative Response
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Lois J Starr, Mark E Lindsay, Deborah Perry, Gregory Gheewalla, Paul A VanderLaan, Adnan Majid, Charlie Strange, George-Claudiu Costea, Adrian Lungu, and Angela E Lin
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Pediatrics, Perinatology and Child Health ,General Medicine ,Pathology and Forensic Medicine - Abstract
Background: Myhre syndrome, caused by pathogenic variants in SMAD4, is characterized by compact body habitus with short stature, distinctive craniofacial appearance, stiff skin, cardiovascular abnormalities (valve stenosis, coarctation, hypoplasia, or stenosis of aorta), effusions of potential spaces (pericardium, pleura, peritoneum), restricted movement of the joints (including thorax), and hearing loss. Lung and airway disease has been reported, but not always well-defined, to include interstitial lung disease, large airway obstruction, and pulmonary arterial hypertension. Excessive fibroproliferation of tissues especially following trauma or surgical instrumentation has been recognized, although these may also present spontaneously. Method: We report the pathologic features of 1 new patient with progressive choanal stenosis, and 22 literature cases, including the expanded history of 5 patients (3 who died). Results: Examination of patient tissues documents cellular fibroproliferation and deposition of excessive extracellular matrix explaining some of the observed clinical features of Myhre syndrome. Conclusion: Excessive fibrosis is noted in multiple tissues, especially heart, lung, and upper and lower airways. Our research provides the first systematic review to provide a knowledge base of gross and pathologic findings in Myhre syndrome.
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- 2022
3. Pandemic video communication: those who think they understand it and those who really do – a randomized controlled between-subjects design (Preprint)
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Daniel Adrian Lungu, Jo Røislien, Ionica Smeets, Siri Wiig, and Kolbjørn Kallesten Brønnick
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BACKGROUND Video played an important role in health communication throughout the COVID-19 pandemic. It was used to communicate pandemic information to the public, with a variety of formats, presenters, and topics. Evidence regarding the effectiveness of video features is available, while how individual characteristics of recipients influence communication comprehension is still limited. OBJECTIVE The aim of this study was to test six individual characteristics and assess their effect on the comprehension of pandemic video communication. METHODS Short health communication videos were presented to a large sample of subjects, receiving questionnaire-responses from 1194 participant. Individual characteristics consisted of age, sex, living area, education level, income level, and belief in science. Communication comprehension consisted of both perceived and objective comprehension. The data was analyzed by multiple linear regression. RESULTS Age had a negative effect on both perceived and objective comprehension – increasing age is associated with lower comprehension. There were sex differences with higher perceived comprehension among women than men, while lower objective comprehension among women compared to men. Living in an urban or a rural area had no significant effect. The level of education and income had a positive effect on both subjective and objective comprehension. Finally, the belief in science had a positive effect on perceived comprehension, while no statistically significant effect on objective comprehension. CONCLUSIONS The main differences between those who think they understand pandemic communication and those who comprehend it better are gender (women have a higher perception of having comprehended, while men have higher levels of objective comprehension) and belief in science (higher belief in science leads to higher perceived comprehension, while it does not have any impact on objectively understanding the message conveyed).
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- 2023
4. Is Heia Meg, a smartphone app, effective in helping users to make healthier lifestyle decisions about nutrition and physical activity? (Preprint)
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Christine Olsen and Daniel Adrian Lungu
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BACKGROUND Obesity is a prevalent and serious chronic condition associated with abnormal or excessive fat buildup that poses significant health risks. The rates of overweight and obesity in adults and children continue to rise, with global rates of overweight or obese children aged 5–19 years growing from 4% to 18% between 1975 and 2016. Furthermore, in 2017, nearly 4 million people died due to complications arising from being overweight or obese. OBJECTIVE The present study aims to investigate the potential impact of the mobile application Heia Meg on promoting healthier lifestyle choices regarding nutrition and physical activity. A prospective longitudinal study was conducted in collaboration with the Norwegian Directorate of Health. METHODS Participants were recruited via the Heia Meg app, and were asked to complete a questionnaire before and after using the app. A total of 199 responses were included in the first (pre-intervention) questionnaire, while 99 valid responses were obtained in the second (post-intervention) questionnaire. RESULTS The majority of participants were women, and their age ranged from 18 years to 70 years and older. Men had a higher Body Mass Index (BMI) than women, but had a higher health score. The results show a reduction in BMI after the digital intervention, but a higher health score was observed in the pre-intervention group. The BMI accounted for a significant amount of variance in the individual’s health score for both groups (26.22% & 18.63%). Regression analysis showed that gender, age, education, smoking, and BMI had a statistically significant effect and accounted for a significant amount of variance (44% & 35%) in the health score. CONCLUSIONS Our study found weak evidence to support the effectiveness of the Heia Meg app in promoting healthier lifestyle choices. However, limitations and confounding factors suggest that further research is needed to confirm our findings. Keywords: lifestyle change, motivation, health, smartphone applications, Heia Meg CLINICALTRIAL Norwegian senter of research 385157
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- 2023
5. Correction: Consensus statement on standards and guidelines for the molecular diagnostics of Alport syndrome: refining the ACMG criteria
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Judy Savige, Helen Storey, Elizabeth Watson, Jens Michael Hertz, Constantinos Deltas, Alessandra Renieri, Francesca Mari, Pascale Hilbert, Pavlina Plevova, Peter Byers, Agne Cerkauskaite, Martin Gregory, Rimante Cerkauskiene, Danica Galesic Ljubanovic, Francesca Becherucci, Carmela Errichiello, Laura Massella, Valeria Aiello, Rachel Lennon, Louise Hopkinson, Ania Koziell, Adrian Lungu, Hansjorg Martin Rothe, Julia Hoefele, Miriam Zacchia, Tamara Nikuseva Martic, Asheeta Gupta, Albertien van Eerde, Susie Gear, Samuela Landini, Viviana Palazzo, Laith al-Rabadi, Kathleen Claes, Anniek Corveleyn, Evelien Van Hoof, Micheel van Geel, Maggie Williams, Emma Ashton, Hendica Belge, Elisabeth Ars, Agnieszka Bierzynska, Concetta Gangemi, and Beata S. Lipska-Ziętkiewicz
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Genetics ,Genetics (clinical) - Published
- 2023
6. Numerical Investigation of the 6-DOF Seakeeping Performances of the KCS Containership
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Adrian Lungu
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seakeeping ,CFD ,added resistance in waves ,breaking waves ,Ocean Engineering ,Water Science and Technology ,Civil and Structural Engineering - Abstract
The topic of the present paper subscribes to one of the most challenging themes that are nowadays under the spotlight of the scientific community. It describes a substantiated method aimed not only at predicting accurately the consequences of the associated effects of navigation in waves but also at contributing to ruling the conditions in which the operation of a ship should be performed is presented. A series of multiple degrees of freedom (DOF hereafter) simulations of the MOERI (Korea Research Institute for Ships and Ocean Engineering) container ship (KCS hereafter) hull moving in regular waves are performed and thoroughly validated with the experimental data provided by the organizers of the Tokyo 2015 Workshop on CFD in Ship Hydrodynamics. A verification and validation (V&V hereafter) is performed for the calm water navigation case to prove the robustness of the theoretical approach. Several numerical innovations are proposed, and the solutions are discussed in every detail aimed at setting up a properly established methodology usable in further similar studies. Finally, a set of remarks will conclude the present research.
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- 2022
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7. Review of the Pathologic Characteristics in Myhre Syndrome: Gain-of-Function Pathogenic Variants in
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Lois J, Starr, Mark E, Lindsay, Deborah, Perry, Gregory, Gheewalla, Paul A, VanderLaan, Adnan, Majid, Charlie, Strange, George-Claudiu, Costea, Adrian, Lungu, and Angela E, Lin
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Male ,Gain of Function Mutation ,Humans ,Facies ,Constriction, Pathologic ,Hand Deformities, Congenital ,Smad4 Protein - Published
- 2022
8. The multifaceted phenotypic and genotypic spectrum of type-IV-collagen-related nephropathy—A human genetics department experience
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Jasmina Ćomić, Korbinian M. Riedhammer, Roman Günthner, Christian W. Schaaf, Patrick Richthammer, Hannes Simmendinger, Donald Kieffer, Riccardo Berutti, Velibor Tasic, Nora Abazi-Emini, Valbona Nushi-Stavileci, Jovana Putnik, Nataša Stajic, Adrian Lungu, Oliver Gross, Lutz Renders, Uwe Heemann, Matthias C. Braunisch, Thomas Meitinger, and Julia Hoefele
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Medicine ,type-IV-collagen-related nephropathy ,Alport syndrome ,General Medicine ,ddc - Abstract
Disease-causing variants in COL4A3-5 are associated with type-IV-collagen-related nephropathy, a genetically and phenotypically multifaceted disorder comprising Alport syndrome (AS) and thin basement membrane nephropathy (TBMN) and autosomal, X-linked and a proposed digenic inheritance. Initial symptoms of individuals with AS are microscopic hematuria followed by proteinuria leading to kidney failure (90% on dialysis < age 40 years). In contrast, individuals with TBMN, an outdated histology-derived term, present with microscopic hematuria, only some of them develop kidney failure (>50 years of age). An early diagnosis of type-IV-collagen-related nephropathy is essential for optimized therapy and slowing of the disease. Sixty index cases, in whom exome sequencing had been performed and with disease-causing variant(s) in COL4A3-5, were evaluated concerning their clinical tentative diagnosis and their genotype. Of 60 reevaluated individuals with type-IV-collagen-related nephropathy, 72% had AS, 23% TBMN and 5% focal segmental glomerulosclerosis (FSGS) as clinical tentative diagnosis. The FSGS cases had to be re-classified as having type-IV-collagen-related nephropathy. Twelve percent of cases had AS as clinical tentative diagnosis and a monoallelic disease-causing variant in COL4A3/4 but could not be classified as autosomal dominant AS because of limited or conflicting clinical data. This study illustrates the complex clinical and genetic picture of individuals with a type IV-collagen-related nephropathy indicating the need of a refined nomenclature and the more interdisciplinary teamwork of clinicians and geneticists as the key to optimized patient care.
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- 2022
9. Measuring research in the big data era: The evolution of performance measurement systems in the Italian teaching hospitals
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Frank Horenberg, Sabina Nuti, and Daniel Adrian Lungu
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Big Data ,Knowledge management ,Impact factor ,Computer science ,business.industry ,030503 health policy & services ,Health Policy ,Citation index ,Scopus ,Benchmarking ,Bibliometrics ,Citation impact ,03 medical and health sciences ,0302 clinical medicine ,Italy ,Humans ,Performance measurement ,030212 general & internal medicine ,Performance indicator ,Teaching hospitalsResearch productivityPerformance evaluationImpact factorField-Weighted Citation Impact ,Hospitals, Teaching ,0305 other medical science ,business - Abstract
Background In the healthcare system, Teaching Hospitals(THs) not only provide care, but also train healthcare professionals and carry out research activities. Research is a fundamental pillar of THs’ mission and relevant for the healthcare system monitored by Performance Evaluation Systems. Research activities can be measured using citation index services and this paper highlights differences between two services based on bibliometrics, describes opportunities and risks when performance indicators rely on data collected, controlled and validated by external services and discusses the possible impact on health policy at a system and provider level. Methods A bibliometric analysis was done on data between 2014-2016 from ISI Web of Science and Scopus of 18.255 physicians working in 26 Italian THs. Quantity was defined as the number of publications and quality as Impact Factor or Field-Weighted Citation Impact. Results Overall, 41.233 and 66.409 documents were extracted from respectively ISI Web of Science and Scopus. While benchmarking results, significant differences in ranked position both in metrics emerged. Discussion Utilizing secondary data sources to measure research activities of THs allows benchmarking at an (inter)national level and overcoming self-referment. To utilize indicators for multiple governance purposes at the system and provider level, indicators need to be profoundly understood, require formalizations in data validation, internal analysis and a sharing process among health professionals, management and policymakers.
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- 2020
10. Key topics in pandemic health risk communication: A qualitative study of expert opinions and knowledge
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Siv Hilde Berg, Marie Therese Shortt, Jo Røislien, Daniel Adrian Lungu, Henriette Thune, and Siri Wiig
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Multidisciplinary ,Health Communication ,Medisinske Fag: 700 [VDP] ,Communication ,COVID-19 ,Humans ,Public Health ,Expert Testimony ,Pandemics - Abstract
Background Science communication can provide people with more accurate information on pandemic health risks by translating complex scientific topics into language that helps people make more informed choices on how to protect themselves and others. During pandemics, experts in medicine, science, public health, and communication are important sources of knowledge for science communication. This study uses the COVID-19 pandemic to explore these experts’ opinions and knowledge of what to communicate to the public during a pandemic. The research question is: What are the key topics to communicate to the public about health risks during a pandemic? Method We purposively sampled 13 experts in medicine, science, public health, and communication for individual interviews, with a range of different types of knowledge of COVID-19 risk and communication at the national, regional and hospital levels in Norway. The interview transcripts were coded and analysed inductively in a qualitative thematic analysis. Results The study’s findings emphasise three central topics pertaining to communication about pandemic health risk during the first year of the COVID-19 pandemic in Norway: 1) how the virus enters the human body and generates disease; 2) how to protect oneself and others from being infected; and 3) pandemic health risk for the individual and the society. Conclusion The key topics emerging from the expert interviews relate to concepts originating from multiple disciplinary fields, and can inform frameworks for interprofessional communication about health risks during a pandemic. The study highlights the complexity of communicating pandemic messages, due to scientific uncertainty, fear of risk amplification, and heterogeneity in public health and scientific literacy. The study contributes with insight into the complex communication processes of pandemic health risk communication.
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- 2022
11. Exploring health experts’ and creative communicators’ focus in pandemic video communication: A qualitative study
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Marie Therese Shortt, Siv Hilde Berg, Siri Wiig, Daniel Adrian Lungu, Ionica Smeets, Henriette Thune, and Jo Røislien
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Samfunnsvitenskap: 200 [VDP] - Abstract
Pandemic video communication aimed at the general public often lacks creativity and fails to reach large audiences. Yet, the scientific content should not be compromised by attempts to improve the creativity or reach. This study explores the processes utilised by various health experts and professional communicators when creating communication, to identify similarities and differences, and how pandemic video communication thus can be improved through an interdisciplinary approach. We interviewed 12 individuals from 6 different professional domains: health, public health, film/science communication, video journalism, advertising, and social media/YouTube. Semi-structured individual interviews were conducted using the same interview guide. The interview data were subjected to thematic analysis with both deductive and inductive coding, and the results were visualised in a bubble chart. Our study has highlighted both similarities and differences between health professionals and creative communicators relating to their creative processes and their approaches to pandemic video communication. We found that participants from health domains assigned great importance to and efforts on the content, but were unsure or lacked experience in how content is translated through form and creativity. Creative communicators, on the other hand, emphasise and specialise in form, yet depend on health professionals, experts, and scientists to provide and validate content. The key to improving pandemic-related video communication appears to lie in striking the right balance between high-quality and evidence-based content and creativity. This study found that both health professionals and creative communicators play crucial roles in reaching a solid end result, and we suggest a fusion model approach to interdisciplinary collaboration.
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- 2022
12. Creating effective, evidence-based video communication of public health science (COVCOM Study)
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Jo Røislien, Jane K O'Hara, Ionica Smeets, Kolbjørn Brønnick, Siv Hilde Berg, Marie Therese Shortt, Daniel Adrian Lungu, Henriette Thune, and Siri Wiig
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Medisinske Fag: 700 [VDP] ,General Medicine - Abstract
Background The nonlinear nature of contagious diseases and the potential for exponential growth can be difficult to grasp for the general public. This has strong implications for public health communication, which needs to be both easily accessible and efficient. A pandemic is an extreme situation, and the accompanying strict societal measures are generally easier to accept if one understands the underlying reasoning behind them. Bringing about informed attitude change and achieving compliance to strict restrictions requires explanations of scientific concepts and terminologies that laypersons can understand. Objective The aim of the project is to develop effective, evidence-based modes of video communication for translating complex, but important, health messages about pandemics to both the general population and decision makers. The study uses COVID-19 as a case to learn and prepare society for handling the ongoing and future pandemics, as well as to provide evidence-based tools for the science communication toolbox. Methods The project applies a mixed methods design, combining qualitative methods (eg, interviews, observational studies, literature reviews) and quantitative methods (eg, randomized controlled trials [RCTs]). The project brings together researchers from a wide range of academic fields, as well as communication industry professionals. Results This study has received funding from the Trond Mohn Foundation through the Research Council of Norway’s “COVID-19 Emergency Call for Proposals” March 2020. Recruitment and data collection for the exploratory first phase of the project ran from February 2021 to March 2021. Creative communication work started in May 2021, and the production of videos for use in the RCTs in the final phase of the project started in September 2021. Conclusions The COVCOM project will take on several grand challenges within the field of communicating science and provide evidence-based tools to the science communication toolbox. A long-term goal of the project is to contribute to the creation of a more resilient health care system by developing communication responses tailormade for different audiences, preparing society for any future pandemic. International Registered Report Identifier (IRRID) DERR1-10.2196/34275
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- 2022
13. Numerical Simulation of the Squatting of Floating Bodies Moving in Shallow Water
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Adrian Lungu
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0209 industrial biotechnology ,Computer simulation ,business.industry ,02 engineering and technology ,Paper based ,Computational fluid dynamics ,Industrial and Manufacturing Engineering ,Trim ,Physics::Fluid Dynamics ,Waves and shallow water ,020303 mechanical engineering & transports ,020901 industrial engineering & automation ,0203 mechanical engineering ,Artificial Intelligence ,Hull ,Squatting position ,Hydrodynamic resistance ,business ,Geology ,Marine engineering - Abstract
In restricted waterways, ship operation is affected by the proximity of the boundaries such as the bottom, horizontal restrictions due to banks and quay walls. Numerical simulations of the ship behavior when moving in restricted water are proposed in the present paper based on a computational fluid dynamics (CFD hereafter) investigation technique. Comparisons with the corresponding numerical solutions for the unlimited water are provided to emphasize the effects of the water depths not only on the pressure distributions on the hull, but also on the sinkage, trim and overall hydrodynamic resistance.
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- 2020
14. A Numerical Study of the Roll Damping for Double-Symmetric Bodies
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Adrian Lungu
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Physics ,0209 industrial biotechnology ,Turbulence ,Flow (psychology) ,02 engineering and technology ,Mechanics ,Industrial and Manufacturing Engineering ,Physics::Fluid Dynamics ,Bilge keel ,020303 mechanical engineering & transports ,020901 industrial engineering & automation ,0203 mechanical engineering ,Artificial Intelligence ,Free surface ,Hull ,Shear stress ,Detached eddy simulation ,Reynolds-averaged Navier–Stokes equations - Abstract
Roll damping is essential for describing properly the motions of a ship, particularly when operating in rough sea conditions, being determinant for parametric or synchronous roll phenomena. Roll damping is a complex process of energy transfer from the hull to the water, which affects the amplitude of motion. Roll damping is dominated by viscous effects as well as by the interaction of the ship with the free surface. Numerical simulations of the free roll decay are carried out in this paper for a double-symmetric floating hull with one or two bilge keels based on an unsteady viscous flow solver. The numerical solutions reported in here are computed with the ISIS-CFD viscous flow solver, part of the Numeca FineTM/Marine suite. Turbulent flow is simulated by solving the unsteady equations of flow. Closure to the turbulence is achieved through the Shear Stress Transport (SST hereafter) based Detached Eddy Simulation (DES), which provides the accuracy of LES for highly separated flow regions and a computational efficiency of RANS in the near-wall region. Free roll decay is studied for various initial roll angles at a given advancing speed of the main hull. The influences of the bilge keel surface and initial roll angle on the roll damping coefficient are discussed.
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- 2020
15. Exponential Growth Bias of Infectious Diseases: Protocol for a Systematic Review
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Daniel Adrian Lungu, Stig Harthug, Jo Røislien, Kolbjørn Brønnick, and Siv Hilde Berg
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systematic review ,smittsom sykdom ,COVID-19 ,kommunikasjon ,smitte ,epidemiologi ,General Medicine ,folkehelse ,pandemi ,Medisinske Fag: 700::Klinisk medisinske fag: 750::Infeksjonsmedisin: 776 [VDP] - Abstract
Background Humans struggle to grasp the extent of exponential growth, which is essential to comprehend the spread of an infectious disease. Exponential growth bias is the tendency to linearize exponential functions when assessing them intuitively. Effective public health communication about the nonlinear nature of infectious diseases has strong implications for the public’s compliance with strict restrictions. However, there is a lack of synthesized knowledge on the communication of the exponential growth of infectious diseases and on the outcomes of exponential growth bias. Objective This systematic review identifies, evaluates, and synthesizes the findings of empirical studies on exponential growth bias of infectious diseases. Methods A systematic review will be conducted using the PRISMA-P (Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols) 2015 statement. Eligibility criteria include empirical studies of exponential growth bias of infectious diseases regardless of methodology. We include studies both with and without interventions/strategies. For information sources, we include the following five bibliographic databases: MEDLINE, Embase, Cochrane Library, PsychINFO, and Web of Science Core Collection. The risk of bias will be assessed using RoB 2 (Risk of Bias 2) and STROBE (Strengthening the Reporting of Observational Studies in Epidemiology). Data synthesis will be achieved through a narrative synthesis. Results By February 2022, we included 11 experimental studies and 1 cross-sectional survey study. Preliminary themes identified are the presence of exponential growth bias, the effect of exponential growth bias, and communication strategies to mitigate exponential growth bias. Data extraction, narrative synthesis, and the risk of bias assessment are to be completed by February 2023. Conclusions We anticipate that this systematic review will draw some lines related to how people comprehend and misperceive exponential growth and its consequences for infectious disease mitigation and communication. Furthermore, the study will conclude with the limitations of the research and suggestions for future research. International Registered Report Identifier (IRRID) DERR1-10.2196/37441
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- 2022
16. Exponential growth bias of infectious diseases: a systematic review protocol (Preprint)
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Daniel Adrian Lungu, Stig Harthug, Jo Røislien, Kolbjørn Brønnick, and Siv Hilde Berg
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BACKGROUND Humans have fundamental difficulties to grasp the extent of exponential growth, which is fundamental to grasp the extent of a spreading infectious disease. Exponential growth bias is the pervasive tendency to linearize exponential functions when assessing them intuitively. OBJECTIVE This systematic review aims to identify, evaluate and synthesise the findings of empirical studies concerning exponential growth bias of infectious diseases METHODS A systematic review will be conducted using the preferred reporting items for systematic review and meta-analysis protocols (PRISMA-P) 2015 statement. Risk of bias will be assessed using ROBINS-2 and STROBE. Data synthesis will be achieved through a narrative synthesis RESULTS As of February 2022, we included 11 studies, see PRISMA flow diagram, figure 1. This comprises 10 quasi-experimental studies and one cross sectional survey study. Preliminary themes identified are: The presence and effect of EGB of infectious diseases, visual and educational strategies to mitigate EGB of infectious diseases. Data extraction, narrative synthesis and risk of bias assessment will be expected to be due June 2022. CONCLUSIONS This systematic review concludes on limitation of the research and drawing some lines related to how people comprehend and misperceive exponential growth and its’ consequences for mitigating infectious diseases. Furthermore, the study will give recommendations for communication of exponential growth of infectious diseases and suggestion for future research.
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- 2022
17. Guidelines for genetic testing and management of Alport syndrome
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Judy Savige, Beata S. Lipska-Zietkiewicz, Elizabeth Watson, Jens Michael Hertz, Constantinos Deltas, Francesca Mari, Pascale Hilbert, Pavlina Plevova, Peter Byers, Agne Cerkauskaite, Martin Gregory, Rimante Cerkauskiene, Danica Galesic Ljubanovic, Francesca Becherucci, Carmela Errichiello, Laura Massella, Valeria Aiello, Rachel Lennon, Louise Hopkinson, Ania Koziell, Adrian Lungu, Hansjorg Martin Rothe, Julia Hoefele, Miriam Zacchia, Tamara Nikuseva Martic, Asheeta Gupta, Albertien van Eerde, Susie Gear, Samuela Landini, Viviana Palazzo, Laith al-Rabadi, Kathleen Claes, Anniek Corveleyn, Evelien Van Hoof, Micheel van Geel, Maggie Williams, Emma Ashton, Hendica Belge, Elisabet Ars, Agnieszka Bierzynska, Concetta Gangemi, Alessandra Renieri, Helen Storey, Frances Flinter, Savige, J, Lipska-Zietkiewicz, B, Watson, E, Hertz, Jm, Deltas, C, Mari, F, Hilbert, P, Plevova, P, Byers, P, Cerkauskaite, A, Gregory, M, Cerkauskiene, R, Ljubanovic, Dg, Becherucci, F, Errichiello, C, Massella, L, Aiello, V, Lennon, R, Hopkinson, L, Koziell, A, Lungu, A, Rothe, Hm, Hoefele, J, Zacchia, M, Martic, Tn, Gupta, A, van Eerde, A, Gear, S, Landini, S, Palazzo, V, Al-Rabadi, L, Claes, K, Corveleyn, A, Van Hoof, E, van Geel, M, Williams, M, Ashton, E, Belge, H, Ars, E, Bierzynska, A, Gangemi, C, Renieri, A, Storey, H, Flinter, F., RS: GROW - R3 - Innovative Cancer Diagnostics & Therapy, and MUMC+: DA KG Lab Centraal Lab (9)
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Feature ,Collagen Type IV ,KIDNEY-TRANSPLANTATION ,RENAL-FAILURE ,MICROSCOPIC HEMATURIA ,Epidemiology ,Nephritis, Hereditary ,Alport syndrome ,COL4A3 ,COL4A4 ,COL4A5 ,FSGS ,collagen IV ,digenic Alport syndrome ,genetic testing ,kidney cysts ,thin basement membrane nephropathy ,Critical Care and Intensive Care Medicine ,urologic and male genital diseases ,Autoantigens ,DIGENIC INHERITANCE ,SEQUENCE VARIANTS ,Humans ,GENOTYPE-PHENOTYPE CORRELATIONS ,Transplantation ,urogenital system ,COL4A3/COL4A4 MUTATIONS ,GLOMERULAR-BASEMENT-MEMBRANE ,NATURAL-HISTORY ,female genital diseases and pregnancy complications ,Nephrology ,Practice Guidelines as Topic ,FAMILIAL HEMATURIA - Abstract
Genetic testing for pathogenic COL4A3-5 variants is usually undertaken to investigate the cause of persistent hematuria, especially with a family history of hematuria or kidney function impairment. Alport syndrome experts now advocate genetic testing for persistent hematuria, even when a heterozygous pathogenic COL4A3 or COL4A4 is suspected, and cascade testing of their first-degree family members because of their risk of impaired kidney function. The experts recommend too that COL4A3 or COL4A4 heterozygotes do not act as kidney donors. Testing for variants in the COL4A3-COL4A5 genes should also be performed for persistent proteinuria and steroid-resistant nephrotic syndrome due to suspected inherited FSGS and for familial IgA glomerulonephritis and kidney failure of unknown cause.
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- 2022
18. UNELE ASPECTE JURIDICE ALE NUMIRII ÎN FUNCȚIE PE BAZĂ DE CONCURS A CONDUCĂTORILOR INSTITUȚIILOR MEDICO-SANITARE PUBLICE
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Adrian LUNGU
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concurs, candidat, etapă, conducător, intituție medico-sanitară publică - Abstract
Concursurile pentru ocuparea funcțiilor de conducători ai instituțiilor medico-sanitare publice desfășurate în ultima perioadă au coincis în mare parte cu evoluțiile crizei politice la nivel național și local. Hotărârea Parlamentului RM nr.89/2021 pentru aprobarea listei ministerelor, precum și decretul Președintelui RM nr.129-IX din 06.08.2021 privind numirea Guvernului au dat posibilitate Ministerului Sănătății să anuleze concursurile pentru ocuparea funcției de director al mai multor instituții medico-sanitare aflate în desfășurare, dar nu și rezultatele concursurilor deja afișate, chiar dacă unele dintre ele au semne vădite de viciere. Aprecierea legalității și temeiniciei rezultatelor concursurilor ține de competența instanței de judecată și doar ca urmare a exercitării dreptului subiectiv al unuia dintre candidați la contestarea lor. Cu regret, cadrul normativ care reglementează numirea în funcţie pe bază de concurs a conducătorilor instituţiilor medico-sanitare publice implică și multiple carențe care se răsfrâng negativ asupra: activității instituțiilor medico-sanitare publice; colectivelor de muncă ale respectivelor instituții; beneficiarilor de servicii de sănătate, inclusiv asupra raporturilor dintre administrația publică centrală de specialitate și administrația publică locală. În consecință, Ministerul Sănătății al Republicii Moldova în cel mai scurt timp urmează să promoveze modificări și completări, în vederea eliminării respectivelor lacune din legislație.
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- 2021
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19. Comprehending and Acting on Pandemic Health Risk Information Differently: A Qualitative Study Using the Mental Models’ Approach
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Marie Therese Shortt, Jane O’Hara, Jo Røislien, Siv Hilde Berg, Daniel Adrian Lungu, Siri Wiig, and Henriette Thune
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Applied psychology ,Pandemic ,Health risk ,Psychology ,Qualitative research - Abstract
BackgroundA worldwide pandemic of a new and unknown virus is characterised by scientific uncertainty. Yet, health authorities still need to communicate complex health risk information to the public – despite this uncertainty. The mental models approach to risk communication describes how people perceive and make decisions regarding complex risks, with the aim of identifying decision-relevant information that can be targeted in risk communication interventions. This study used COVID-19 as a case to explore how people make sense of scientific information and apply it to their lives and behaviour using the concept of mental models.MethodsThis qualitative study included 15 male and female participants of different ages and from different geographical regions in Norway, occupational areas and with different education levels. The participants were interviewed individually, and the interview data analysed via directed content analysis, with predetermined themes and codes derived the Norwegian Institute of Public Health’s official website. Materials in the interview data not represented by deductive codes were coded inductively. The participants’ perceptions and behaviours related to health risk information were analysed across three themes: virus transmission, exposure to risk and consequences of COVID-19. ResultsThe results imply that people put different meanings to the medical and scientific words used by experts to explain the pandemic, e.g. virus transmission and the reproduction number. And while some people expressed the need to comprehend why certain behavior and activities involve a high risk, others preferred simple, clear messages focusing on what to do and how to protect themselves. Similarly, information about health consequences caused panic for some and awareness for others. ConclusionThere is no one-size fits all to public health risk communication, and empowering people with decision-relevant information necessitates targeted and balanced risk communication.
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- 2021
20. Creating Effective, Evidence-Based Video Communication of Public Health Science (COVCOM Study): Protocol for a Sequential Mixed Methods Effect Study (Preprint)
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Jo Røislien, Jane K O'Hara, Ionica Smeets, Kolbjørn Brønnick, Siv Hilde Berg, Marie Therese Shortt, Daniel Adrian Lungu, Henriette Thune, and Siri Wiig
- Abstract
BACKGROUND The nonlinear nature of contagious diseases and the potential for exponential growth can be difficult to grasp for the general public. This has strong implications for public health communication, which needs to be both easily accessible and efficient. A pandemic is an extreme situation, and the accompanying strict societal measures are generally easier to accept if one understands the underlying reasoning behind them. Bringing about informed attitude change and achieving compliance to strict restrictions requires explanations of scientific concepts and terminologies that laypersons can understand. OBJECTIVE The aim of the project is to develop effective, evidence-based modes of video communication for translating complex, but important, health messages about pandemics to both the general population and decision makers. The study uses COVID-19 as a case to learn and prepare society for handling the ongoing and future pandemics, as well as to provide evidence-based tools for the science communication toolbox. METHODS The project applies a mixed methods design, combining qualitative methods (eg, interviews, observational studies, literature reviews) and quantitative methods (eg, randomized controlled trials [RCTs]). The project brings together researchers from a wide range of academic fields, as well as communication industry professionals. RESULTS This study has received funding from the Trond Mohn Foundation through the Research Council of Norway’s “COVID-19 Emergency Call for Proposals” March 2020. Recruitment and data collection for the exploratory first phase of the project ran from February 2021 to March 2021. Creative communication work started in May 2021, and the production of videos for use in the RCTs in the final phase of the project started in September 2021. CONCLUSIONS The COVCOM project will take on several grand challenges within the field of communicating science and provide evidence-based tools to the science communication toolbox. A long-term goal of the project is to contribute to the creation of a more resilient health care system by developing communication responses tailormade for different audiences, preparing society for any future pandemic. INTERNATIONAL REGISTERED REPORT DERR1-10.2196/34275
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- 2021
21. Differences in comprehending and acting on pandemic health risk information: a qualitative study using mental models
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Siv Hilde Berg, Marie Therese Shortt, Henriette Thune, Jo Røislien, Jane K. O’Hara, Daniel Adrian Lungu, and Siri Wiig
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Male ,pandemic ,kognitiv psykologi ,healthcare communication ,Communication ,helsekommunikasjon ,Public Health, Environmental and Occupational Health ,COVID-19 ,Models, Psychological ,cognitive psychology ,risk communication ,Medisinske Fag: 700 [VDP] ,Humans ,Female ,Pandemics ,pandemi ,Qualitative Research ,risikokommunikasjon - Abstract
Background A worldwide pandemic of a new and unknown virus is characterised by scientific uncertainty. However, despite this uncertainty, health authorities must still communicate complex health risk information to the public. The mental models approach to risk communication describes how people perceive and make decisions about complex risks, with the aim of identifying decision-relevant information that can be incorporated into risk communication interventions. This study explored how people use mental models to make sense of scientific information and apply it to their lives and behaviour in the context of COVID-19. Methods This qualitative study enrolled 15 male and female participants of different ages, with different levels of education and occupational backgrounds and from different geographical regions of Norway. The participants were interviewed individually, and the interview data were subjected to thematic analysis. The interview data were compared to a expert model of COVID-19 health risk communication based on online information from the Norwegian Institute of Public Health. Materials in the interview data not represented by expert model codes were coded inductively. The participants’ perceptions of and behaviours related to health risk information were analysed across three themes: virus transmission, risk mitigation and consequences of COVID-19. Results The results indicate that people placed different meanings on the medical and scientific words used by experts to explain the pandemic (e.g., virus transmission and the reproduction number). While some people wanted to understand why certain behaviour and activities were considered high risk, others preferred simple, clear messages explaining what to do and how to protect themselves. Similarly, information about health consequences produced panic in some interviewees and awareness in others. Conclusion There is no one-size-fits-all approach to public health risk communication. Empowering people with decision-relevant information necessitates targeted and balanced risk communication.
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- 2021
22. A continuous PREMs and PROMs Observatory for elective hip and knee arthroplasty: study protocol
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Daniel Adrian Lungu, Sabina De Rosis, Sabina Nuti, Francesca Pennucci, and Mario Manca
- Subjects
protocols & guidelines ,hip ,medicine.medical_treatment ,Arthroplasty, Replacement, Hip ,health services administration & management ,knee ,Computer-assisted web interviewing ,Oxford hip score ,quality in health care ,orthopaedic & trauma surgery ,Observatory ,Surveys and Questionnaires ,Health care ,Medicine ,Data Protection Act 1998 ,Humans ,Patient Reported Outcome Measures ,Arthroplasty, Replacement, Knee ,Protocol (science) ,business.industry ,General Medicine ,medicine.disease ,Arthroplasty ,Elective Surgical Procedures ,Medical emergency ,Health Services Research ,business ,Delivery of Health Care ,Oxford knee score - Abstract
IntroductionScholars, healthcare practitioners and policymakers have increasingly focused their attention on patient-centredness. Patient-reported metrics support patient-driven improvement actions in healthcare systems. Despite the great interest, patient-reported outcome measures (PROMs) are still not extensively collected in many countries and not integrated with the collection of patient-reported experience measures (PREMs). This protocol describes the methodology behind an innovative observatory implemented in Tuscany, Italy, aiming at continuously and longitudinally collecting PROMs and PREMs for elective hip and knee total replacement.Methods and analysisThe Observatory is digital. Enrolled patients are invited via SMS or email to online questionnaires, which include the Oxford Hip Score or the Oxford Knee Score. Data are real-time reported to healthcare professionals and managers in a raw format, anonymised and aggregated on a web platform. The data will be used to investigate the relationship between the PROMs trend and patients’ characteristics, surgical procedure, hospital characteristics, and PREMs. Indicators using patient data will be computed, and they will integrate the healthcare performance evaluation system adopted in Tuscany.Ethics and disseminationThe data protection officers of local healthcare organisations and the regional privacy office framed the initiative referring to the national and regional guidelines that regulate patient surveys. The findings will be reported both in real time and for publication in peer-reviewed journals.
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- 2021
23. Review of: 'Patient prioritisation methods to shorten waiting times for elective surgery: A systematic review of how to improve access to surgery'
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Daniel Adrian Lungu
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Waiting time ,medicine.medical_specialty ,business.industry ,General surgery ,medicine ,Elective surgery ,business - Published
- 2021
24. Health authorities’ health risk communication with the public during pandemics: a rapid scoping review
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Henriette Thune, Kolbjørn Kallesten Brønnick, Daniel Adrian Lungu, Siv Hilde Berg, Jane O’Hara, Marie Therese Shortt, Jo Røislien, and Siri Wiig
- Subjects
medicine.medical_specialty ,020205 medical informatics ,Swine ,media_common.quotation_subject ,02 engineering and technology ,Risk communication ,03 medical and health sciences ,Influenza A Virus, H1N1 Subtype ,Media communication ,Social sciences: 200 [VDP] ,0302 clinical medicine ,risk communication ,Pandemic ,0202 electrical engineering, electronic engineering, information engineering ,medicine ,Animals ,Humans ,Social media ,030212 general & internal medicine ,Pandemics ,Health communication ,pandemi ,risikokommunikasjon ,media_common ,Digital marketing ,SARS-CoV-2 ,business.industry ,Communication ,Research ,pandemic ,healthcare communication ,Samfunnsvitenskap: 200 [VDP] ,Source credibility ,Public health ,H1N1 ,helsekommunikasjon ,Public Health, Environmental and Occupational Health ,COVID-19 ,Public relations ,Content analysis ,Public Health ,Public aspects of medicine ,RA1-1270 ,business ,Social Media ,Diversity (politics) - Abstract
Background Responses from the H1N1 swine flu pandemic and the recent COVID-19 coronavirus pandemic provide an opportunity for insight into the role of health authorities’ ways of communicating health risk information to the public. We aimed to synthesise the existing evidence regarding different modes of communication used by health authorities in health risk communication with the public during a pandemic. Methods We conducted a rapid scoping review. MEDLINE and EMBASE were searched for publications in English from January 2009 through October 2020, covering both the full H1N1 pandemic and the response phase during the COVID-19 pandemic. The search resulted in 1440 records, of which 48 studies met our eligibility criteria. Results The present review identified studies across a broad interdisciplinary field of health risk communication. The majority focused on the H1N1 pandemic and the COVID-19 pandemic. A content analysis of the studies identified three categories for modes of communication: i) communication channels, ii) source credibility and iii) how the message is communicated. The identified studies on social media focused mainly on content and engagement, while studies on the effect of the use of social media and self-protective behaviour were lacking. Studies on the modes of communication that take the diversity of receivers in the field into account are lacking. A limited number of studies of health authorities’ use of graphic and audio-visual means were identified, yet these did not consider/evaluate creative communication choices. Conclusion Experimental studies that investigate the effect of health authorities’ videos and messages on social media platforms and self-protective behaviour are needed. More studies are needed across the fields of health risk communication and media studies, including visual communication, web design, video and digital marketing, at a time when online digital communication is central to reaching the public.
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- 2021
25. The Role of Recipient Characteristics in Health Video Communication Outcomes: Scoping Review (Preprint)
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Daniel Adrian Lungu, Jo Røislien, Siri Wiig, Marie Therese Shortt, Francesca Ferrè, Siv Hilde Berg, Henriette Thune, and Kolbjørn Kallesten Brønnick
- Abstract
BACKGROUND The importance of effective communication during public health emergencies has been highlighted by the World Health Organization, and it has published guidelines for effective communication in such situations. With video being a popular medium, video communication has been a growing area of study over the past decades and is increasingly used across different sectors and disciplines, including health. Health-related video communication gained momentum during the SARS-CoV-2 pandemic, and video was among the most frequently used modes of communication worldwide. However, although much research has been done regarding different characteristics of video content (the message) and its delivery (the messenger), there is a lack of knowledge about the role played by the characteristics of the recipients for the creation of effective communication. OBJECTIVE The aim of this review is to identify how health video communication outcomes are shaped by recipient characteristics, as such characteristics might affect the effectiveness of communication. The main research question of the study is as follows: do the characteristics of the recipients of health videos affect the outcomes of the communication? METHODS A scoping review describing the existing knowledge within the field was conducted. We searched for literature in 3 databases (PubMed, Scopus, and Embase) and defined eligibility criteria based on the relevance to the research question. Recipient characteristics and health video communication outcomes were identified and classified. RESULTS Of the 1040 documents initially identified, 128 (12.31%) met the criteria for full-text assessment, and 39 (3.75%) met the inclusion criteria. The included studies reported 56 recipient characteristics and 42 communication outcomes. The reported associations between characteristics and outcomes were identified, and the potential research opportunities were discussed. Contributions were made to theory development by amending the existing framework of the Integrated-Change model, which is an integrated model of motivational and behavioral change. CONCLUSIONS Although several recipient characteristics and health video communication outcomes were identified, there is a lack of robust empirical evidence on the association between them. Further research is needed to understand how the preceding characteristics of the recipients might affect the various outcomes of health video communication.
- Published
- 2021
26. Consensus statement on standards and guidelines for the molecular diagnostics of Alport syndrome: refining the ACMG criteria
- Author
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Tamara Nikuševa Martić, Carmela Errichiello, Albertien M. van Eerde, Anniek Corveleyn, Pascale Hilbert, Rimante Cerkauskiene, Micheel van Geel, Samuela Landini, Concetta Gangemi, Miriam Zacchia, Emma Ashton, Evelien Van Hoof, Valeria Aiello, Martin C. Gregory, Elisabeth Ars, Viviana Palazzo, Constantinos Deltas, Asheeta Gupta, Laura Massella, Susie Gear, Laith Al-Rabadi, Danica Galešić Ljubanović, Louise Hopkinson, Julia Hoefele, Jens Michael Hertz, Peter H. Byers, Elizabeth Watson, Judy Savige, Agnieszka Bierzynska, Francesca Becherucci, Pavlina Plevova, Beata S. Lipska-Ziętkiewicz, Maggie Williams, Adrian Lungu, Ania Koziell, Kathleen Claes, Agne Cerkauskaite, Francesca Mari, Hendica Belge, Alessandra Renieri, Helen Storey, Hansjorg Martin Rothe, Rachel Lennon, Savige, J., Storey, H., Watson, E., Hertz, J. M., Deltas, C., Renieri, A., Mari, F., Hilbert, P., Plevova, P., Byers, P., Cerkauskaite, A., Gregory, M., Cerkauskiene, R., Ljubanovic, D. G., Becherucci, F., Errichiello, C., Massella, L., Aiello, V., Lennon, R., Hopkinson, L., Koziell, A., Lungu, A., Rothe, H. M., Hoefele, J., Zacchia, M., Martic, T. N., Gupta, A., van Eerde, A., Gear, S., Landini, S., Palazzo, V., al-Rabadi, L., Claes, K., Corveleyn, A., Van Hoof, E., van Geel, M., Williams, M., Ashton, E., Belge, H., Ars, E., Bierzynska, A., Gangemi, C., Lipska-Zietkiewicz, B. S., RS: GROW - R3 - Innovative Cancer Diagnostics & Therapy, and MUMC+: DA KG Lab Centraal Lab (9)
- Subjects
Collagen Type IV ,medicine.medical_specialty ,Consensus ,IV COLLAGEN ,030232 urology & nephrology ,AMINO-ACID-SEQUENCE ,MEDICAL GENETICS ,Diseases ,Nephritis, Hereditary ,AMERICAN-COLLEGE ,Meeting Report ,urologic and male genital diseases ,Autoantigens ,DISEASE ,03 medical and health sciences ,diseases ,Alport syndrome ,0302 clinical medicine ,Genetics ,medicine ,GLYCINE SUBSTITUTIONS ,Humans ,Genetic Testing ,Genetics (clinical) ,030304 developmental biology ,0303 health sciences ,business.industry ,MUTATIONS ,Molecular diagnostics ,medicine.disease ,Phenotype ,female genital diseases and pregnancy complications ,Minor allele frequency ,OSTEOGENESIS IMPERFECTA ,BASEMENT-MEMBRANE ,Practice Guidelines as Topic ,Medical genetics ,CHAIN ,business ,Nephrotic syndrome ,Minigene ,Founder effect - Abstract
The recent Chandos House meeting of the Alport Variant Collaborative extended the indications for screening for pathogenic variants in the COL4A5, COL4A3 and COL4A4 genes beyond the classical Alport phenotype (haematuria, renal failure; family history of haematuria or renal failure) to include persistent proteinuria, steroid-resistant nephrotic syndrome, focal and segmental glomerulosclerosis (FSGS), familial IgA glomerulonephritis and end-stage kidney failure without an obvious cause. The meeting refined the ACMG criteria for variant assessment for the Alport genes (COL4A3–5). It identified ‘mutational hotspots’ (PM1) in the collagen IV α5, α3 and α4 chains including position 1 Glycine residues in the Gly-X-Y repeats in the intermediate collagenous domains; and Cysteine residues in the carboxy non-collagenous domain (PP3). It considered that ‘well-established’ functional assays (PS3, BS3) were still mainly research tools but sequencing and minigene assays were commonly used to confirm splicing variants. It was not possible to define the Minor Allele Frequency (MAF) threshold above which variants were considered Benign (BA1, BS1), because of the different modes of inheritances of Alport syndrome, and the occurrence of hypomorphic variants (often Glycine adjacent to a non-collagenous interruption) and local founder effects. Heterozygous COL4A3 and COL4A4 variants were common ‘incidental’ findings also present in normal reference databases. The recognition and interpretation of hypomorphic variants in the COL4A3–COL4A5 genes remains a challenge.
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- 2021
27. Identification of disease-causing variants by comprehensive genetic testing with exome sequencing in adults with suspicion of hereditary FSGS
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Matias Wagner, Thomas Meitinger, Matthias C. Braunisch, Sarah Draut, Bader Alhaddad, Lutz Renders, Christoph Schmaderer, Tim M. Strom, Adrian Lungu, Uwe Heemann, Julia Hoefele, Marc Weidenbusch, Roman Günthner, Pierre-Maurice Herr, and Korbinian M. Riedhammer
- Subjects
Adult ,Male ,Pediatrics ,medicine.medical_specialty ,Genetic Research ,Nephrotic Syndrome ,Genetic counseling ,030232 urology & nephrology ,Focal segmental glomerulosclerosis ,Disease ,Consanguinity ,Article ,03 medical and health sciences ,Young Adult ,End-stage renal disease ,0302 clinical medicine ,Exome Sequencing ,Genetics research ,Genetics ,medicine ,Humans ,Exome ,Genetic Testing ,Genetics (clinical) ,Exome sequencing ,030304 developmental biology ,Genetic testing ,0303 health sciences ,Paediatric kidney disease ,medicine.diagnostic_test ,business.industry ,Glomerulosclerosis, Focal Segmental ,medicine.disease ,ddc ,Phenotype ,Female ,Kidney Diseases ,Renal biopsy ,business ,Nephrotic syndrome - Abstract
In about 30% of infantile, juvenile, or adolescent patients with steroid-resistant nephrotic syndrome (SRNS), a monogenic cause can be identified. The histological finding in SRNS is often focal segmental glomerulosclerosis (FSGS). Genetic data on adult patients are scarce with low diagnostic yields. Exome sequencing (ES) was performed in patients with adult disease onset and a high likelihood for hereditary FSGS. A high likelihood was defined if at least one of the following criteria was present: absence of a secondary cause, ≤25 years of age at initial manifestation, kidney biopsy with suspicion of a hereditary cause, extrarenal manifestations, and/or positive familial history/reported consanguinity. Patients were excluded if age at disease onset was
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- 2021
28. Caesarean sections in teaching hospitals: systematic review and meta-analysis of hospitals in 22 countries
- Author
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Jeta Bunjaku, Krenare Grezda, George A. Little, Manila Bonciani, Fitim Sadiku, Daniel Adrian Lungu, Ilir Hoxha, Riaz Agahi, Esra Zhubi, and Blerta Kryeziu
- Subjects
medicine.medical_specialty ,medicine.medical_treatment ,Population ,education ,statistics & research methods ,lcsh:Medicine ,CINAHL ,Cochrane Library ,Odds ,03 medical and health sciences ,0302 clinical medicine ,Pregnancy ,medicine ,Humans ,Caesarean section ,030212 general & internal medicine ,Prospective Studies ,Hospitals, Teaching ,Retrospective Studies ,education.field_of_study ,030219 obstetrics & reproductive medicine ,obstetrics ,business.industry ,Cesarean Section ,Public health ,lcsh:R ,public health ,Parturition ,General Medicine ,Sample size determination ,Family medicine ,Meta-analysis ,Female ,Health Services Research ,business - Abstract
ObjectiveThe aim of this study is to determine the odds of caesarean section in all births in teaching hospitals as compared with non-teaching hospitals.SettingOver 3600 teaching and non-teaching hospitals in 22 countries. We searched CINAHL, The Cochrane Library, PubMed, sciELO, Scopus and Web of Science from the beginning of records until May 2020.ParticipantsWomen at birth. Over 18.5 million births.InterventionCaesarean section.Primary and secondary outcome measuresThe primary outcome measures are the adjusted OR of caesarean section in a variety of teaching hospital comparisons. The secondary outcome is the crude OR of caesarean section in a variety of teaching hospital comparisons.ResultsIn adjusted analyses, we found that university hospitals have lower odds than non-teaching hospitals (OR=0.66, 95% CI 0.56 to 0.78) and other teaching hospitals (OR=0.46, 95% CI 0.24 to 0.89), and no significant difference with unspecified teaching status hospitals (OR=0.92, 95% CI 0.80 to 1.05, τ2=0.009). Other teaching hospitals had higher odds than non-teaching hospitals (OR=1.23, 95% CI 1.12 to 1.35). Comparison between unspecified teaching hospitals and non-teaching hospitals (OR=0.91, 95% CI 0.50 to 1.65, τ2=1.007) and unspecified hospitals (OR=0.95, 95% CI 0.76 to 1.20), τ2ConclusionsWith smaller sample of participants and studies, in clearly defined hospitals categories under comparison, we see that university hospitals have lower odds for caesarean. With larger sample size and number of studies, as well as less clearly defined categories of hospitals, we see no significant difference in the likelihood of caesarean sections between teaching and non-teaching hospitals. Nevertheless, even in groups with no significant effect, teaching hospitals have a lower or higher likelihood of caesarean sections in several analysed subgroups. Therefore, we recommend a more precise examination of forces sustaining these trends.PROSPERO registration numberCRD42020158437.
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- 2021
29. The impact of new surgical techniques on geographical unwarranted variation: The case of benign hysterectomy
- Author
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Andrea Giannini, Tommaso Simoncini, Paolo Belardi, Elisa Foresi, Sabina Nuti, and Daniel Adrian Lungu
- Subjects
Waiting time ,medicine.medical_specialty ,Health, Toxicology and Mutagenesis ,medicine.medical_treatment ,benign hysterectomy ,Hysterectomy ,Article ,treatment rate ,03 medical and health sciences ,0302 clinical medicine ,Postoperative Complications ,Health care ,International literature ,medicine ,Humans ,030212 general & internal medicine ,Elective surgery ,Retrospective Studies ,business.industry ,elective surgery ,waiting times ,unwarranted variation ,030503 health policy & services ,General surgery ,Public Health, Environmental and Occupational Health ,Robotics ,Variation (linguistics) ,Elective Surgical Procedures ,Medicine ,Female ,Laparoscopy ,Benign hysterectomy ,Treatment rate ,Unwarranted variation ,Waiting times ,0305 other medical science ,Elective Surgical Procedure ,business ,Developed country - Abstract
Since the 1980s, the international literature has reported variations for healthcare services, especially for elective ones. Variations are positive if they reflect patient preferences, while if they do not, they are unwarranted, and thus avoidable. Benign hysterectomy is among the most frequent elective surgical procedures in developed countries, and, in recent years, it has been increasingly delivered through minimally invasive surgical techniques, namely laparoscopic or robotic. The question therefore arises over what the impact of these new surgical techniques on avoidable variation is. In this study we analyze the extent of unwarranted geographical variation of treatment rates and of the adoption of minimally invasive procedures for benign hysterectomy in an Italian regional healthcare system. We assess the impact of the surgical approach on the provision of benign hysterectomy, in terms of efficiency (by measuring the average length of stay) and efficacy (by measuring the post-operative complications). Geographical variation was observed among regional health districts for treatment rates and waiting times. At a provider level, we found differences for the minimally invasive approach. We found a positive and significant association between rates and the percentage of minimally invasive procedures. Providers that frequently adopt minimally invasive procedures have shorter average length of stay, and when they also perform open hysterectomies, fewer complications.
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- 2021
30. The Role of Recipient Characteristics in Health Video Communication Outcomes: Scoping Review
- Author
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Daniel Adrian Lungu, Jo Røislien, Siri Wiig, Marie Therese Shortt, Francesca Ferrè, Siv Hilde Berg, Henriette Thune, and Kolbjørn Kallesten Brønnick
- Subjects
health communication (36) ,video communication (1) ,communication outcomes ,recipient characteristics ,recipient factors ,health video communication ,SARS-CoV-2 ,Communication ,Communications Media ,video communication ,COVID-19 ,Health Informatics ,Review ,Health Communication ,Medisinske Fag: 700 [VDP] ,Humans ,Pandemics - Abstract
Background The importance of effective communication during public health emergencies has been highlighted by the World Health Organization, and it has published guidelines for effective communication in such situations. With video being a popular medium, video communication has been a growing area of study over the past decades and is increasingly used across different sectors and disciplines, including health. Health-related video communication gained momentum during the SARS-CoV-2 pandemic, and video was among the most frequently used modes of communication worldwide. However, although much research has been done regarding different characteristics of video content (the message) and its delivery (the messenger), there is a lack of knowledge about the role played by the characteristics of the recipients for the creation of effective communication. Objective The aim of this review is to identify how health video communication outcomes are shaped by recipient characteristics, as such characteristics might affect the effectiveness of communication. The main research question of the study is as follows: do the characteristics of the recipients of health videos affect the outcomes of the communication? Methods A scoping review describing the existing knowledge within the field was conducted. We searched for literature in 3 databases (PubMed, Scopus, and Embase) and defined eligibility criteria based on the relevance to the research question. Recipient characteristics and health video communication outcomes were identified and classified. Results Of the 1040 documents initially identified, 128 (12.31%) met the criteria for full-text assessment, and 39 (3.75%) met the inclusion criteria. The included studies reported 56 recipient characteristics and 42 communication outcomes. The reported associations between characteristics and outcomes were identified, and the potential research opportunities were discussed. Contributions were made to theory development by amending the existing framework of the Integrated-Change model, which is an integrated model of motivational and behavioral change. Conclusions Although several recipient characteristics and health video communication outcomes were identified, there is a lack of robust empirical evidence on the association between them. Further research is needed to understand how the preceding characteristics of the recipients might affect the various outcomes of health video communication.
- Published
- 2021
31. Energy-Saving Devices in Ship Propulsion: Effects of Nozzles Placed in Front of Propellers
- Author
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Adrian Lungu
- Subjects
Nozzle ,020101 civil engineering ,Ocean Engineering ,Thrust ,nozzles ,02 engineering and technology ,Inflow ,Propulsion ,01 natural sciences ,performance coefficients ,010305 fluids & plasmas ,0201 civil engineering ,lcsh:Oceanography ,lcsh:VM1-989 ,0103 physical sciences ,Duct (flow) ,lcsh:GC1-1581 ,rotating frame ,Water Science and Technology ,Civil and Structural Engineering ,Physics ,DES-SST turbulence model ,Propeller ,sliding grids ,lcsh:Naval architecture. Shipbuilding. Marine engineering ,Mechanics ,propeller open water ,Drag ,numerical simulation ,Detached eddy simulation - Abstract
The hydrodynamic effect exerted by a nozzle placed in front of a KP505 propeller on the propulsive performances is studied by using extensive numerical simulations. The influence of a NACA 0015 nozzle with a chord length of 0.3 of the propeller diameter, D, mounted at 0.2 D in front of the propeller plane is studied for a various range of relevant nozzle diameters and different angles of attack. A detached eddy simulation (DES)-based hybrid technique implemented on the ISIS-CFD finite volume solver of the Numeca&rsquo, s FineTM/Marine environment is proposed to fit the purpose. Systematically conducted simulations have proven that the net thrust reflecting the overall drag, which includes the nozzle, depends on the duct size. The duct presence determines two regions of the inflow into the propeller. One is the inner region of the nozzle where the high-speed flow exists because of the contraction of the duct. The other is the outer region of the nozzle where the flow decelerates due to the duct wake. Lower- and higher-pressure coefficients on the suction and pressure sides, cover a significantly wider area than those of the case without the nozzle, leading therefore to greater thrust and torque. The existence of a critical attack angle for which the magnitude of the relative axial force becomes maximum for the smallest nozzle diameter has been noticed.
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- 2021
32. Shortcomings in Public Health Authorities’ Videos on COVID-19: Limited Reach and a Creative Gap
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Marie Therese Shortt, Ionica Smeets, Siri Wiig, Siv Hilde Berg, Daniel Adrian Lungu, Henriette Thune, and Jo Røislien
- Subjects
communication ,Medisinske Fag: 700 [VDP] ,Samfunnsvitenskap: 200 [VDP] ,public health ,Communication. Mass media ,COVID-19 ,General Earth and Planetary Sciences ,video ,authorities ,P87-96 ,youtube ,General Environmental Science - Abstract
Video communication has played a key role in relaying important and complex information on the COVID-19 pandemic to the general public. The aim of the present study is to compare Norwegian health authorities’ and WHO’s use of video communication during the COVID-19 pandemic to the most viewed COVID-19 videos on YouTube, in order to identify how videos created by health authorities measure up to contemporary video content, both creatively and in reaching video consumers. Through structured search on YouTube we found that Norwegian health authorities have published 26 videos, and the WHO 29 videos on the platform. Press briefings, live videos, news reports, and videos recreated/translated into other languages than English or Norwegian, were not included. A content analysis comparing the 55 videos by the health authorities to the 27 most viewed videos on COVID-19 on YouTube demonstrates poor reach of health authorities’ videos in terms of views and it elucidates a clear creative gap. While the videos created by various YouTube creators communicate using a wide range of creative presentation means (such as professional presenters, contextual backgrounds, advanced graphic animations, and humour), videos created by the health authorities are significantly more homogenous in style often using field experts or public figures, plain backgrounds or PowerPoint style animations. We suggest that further studies into various creative presentation means and their influence on reach, recall, and on different groups of the population, are carried out in the future to evaluate specific factors of this creative gap.
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- 2021
33. Management of a company's communication structures with its collaborators
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Adrian Lungu, Mihaela Baritz, and Luciana Cristea
- Published
- 2020
34. Some considerations regarding the use of protective lenses in computer activities
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Adrian Lungu, Luciana Cristea, and Mihaela Baritz
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Protective lenses - Published
- 2020
35. PR3 Patient-Reported Outcome Measures to Prioritize Surgical Lists during Pandemic Events
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Sabina Nuti, Daniel Adrian Lungu, S. De Rosis, and Francesca Pennucci
- Subjects
Prioritization ,2019-20 coronavirus outbreak ,Coronavirus disease 2019 (COVID-19) ,Health professionals ,business.industry ,Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ,Health Policy ,Public Health, Environmental and Occupational Health ,Oncological surgery ,medicine.disease ,Article ,female genital diseases and pregnancy complications ,Pandemic ,medicine ,Patient-reported outcome ,Medical emergency ,business - Abstract
Objectives: When pandemic events arise, there are complex decisions to take under pressure, such as the prioritization of cases While there are international examples of using PROMs to organize waiting lists, there are no such experiences in Italy Italy was the first European country to be hit hard by the COVID-19 outbreak, and a selection of patients was necessary Could PROMs be used in a prioritization process? Methods: We focused on robotic oncological surgery for prostate cancer in three different surgical units (SU) in Tuscany (Italy) We selected all patients who replied to the baseline PROMs questionnaire (EORTC-QLQ-C30) and received surgery during the COVID-19 crisis (March-May 2020) (n=86) We comparatively analyzed, for each SU, their baseline score with their position both in the real weekly surgical list and the simulation of an optimized list by using the PROMs, considering ±3 positions of tolerance We discussed the findings with healthcare professionals Results: More than 65 7% of cases were not operated accordingly to the severity perceived by patients In one SU, the two surgical lists did not significantly differ In the others, those who underwent later the surgery reported a worse condition (mean PROMs score 69/100;mean n positions in surgical list SU1 +16 on 40) Healthcare professionals discussed the limits and potential of integrating PROMs-scores among the prioritization criteria, reaching a consensus on specific PROMs indicators to be tested to this eds Conclusions: PROMs may represent a key tool to prioritize patients in oncological surgery Surgical activities are still organized from a provider perspective We proposed the use of PROMs as a tool to consider patient-reported needs to prioritize procedures Further analysis should be done to estimate the value of using PROMs for the prioritization of most severe cases
- Published
- 2020
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36. A DES-SST Based Assessment of Hydrodynamic Performances of the Wetted and Cavitating PPTC Propeller
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Adrian Lungu
- Subjects
020101 civil engineering ,Ocean Engineering ,02 engineering and technology ,DES turbulence model ,01 natural sciences ,010305 fluids & plasmas ,0201 civil engineering ,Physics::Fluid Dynamics ,lcsh:Oceanography ,cavitation ,lcsh:VM1-989 ,0103 physical sciences ,Advance ratio ,lcsh:GC1-1581 ,Water Science and Technology ,Civil and Structural Engineering ,Mathematics ,Finite volume method ,Computer simulation ,Turbulence ,Propeller ,lcsh:Naval architecture. Shipbuilding. Marine engineering ,Mechanics ,Solver ,propeller open water ,Variable pitch propeller ,numerical simulation ,Detached eddy simulation - Abstract
The paper describes an investigation of the hydrodynamic performances of a five-bladed controllable pitch propeller, whose geometry was provided by Schiffbau-Versuchsanstalt (SVA) Potsdam GmbH Model Basin. Both cavitating and non-cavitating regimes are numerically simulated for different advance ratio coefficients. The numerical approach is based on a finite volume approach in which closure to the turbulence is achieved through detached eddy simulation (DES). Propeller open water (POW) characteristics are computed, and the numerical solutions are validated through extensive comparisons with experimental data. In addition, the bi-phasic flow for the cavitating regime is simulated, for which comparisons with the cavitation sketches are performed to check the ability of the solver to estimate the cavitation extent. Grid convergence tests are performed for both working regimes together with validation and verification checks, not only to size the level of the numerical errors, but also to prove the robustness of the chosen numerical approach. Finally, a set of final remarks will conclude the present research.
- Published
- 2020
37. Implementing successful systematic Patient Reported Outcome and Experience Measures (PROMs and PREMs) in robotic oncological surgery—The role of physicians
- Author
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Francesca Pennucci, Franca Melfi, Daniel Adrian Lungu, Sabina De Rosis, and Gaetano Romano
- Subjects
Adult ,medicine.medical_specialty ,media_common.quotation_subject ,Oncological surgery ,03 medical and health sciences ,PROMs ,Robotic Surgical Procedures ,patient reported experience measures ,patient reported outcome measures ,PREMs ,robotic surgery ,Daily practice ,Medicine ,Humans ,Robotic surgery ,Personal motivation ,Program Development ,Intensive care medicine ,Physician's Role ,media_common ,Teamwork ,business.industry ,030503 health policy & services ,Health Policy ,Colorectal Neoplasms ,Colorectal Surgery ,Italy ,Surgical Oncology ,Patient Reported Outcome Measures ,Colorectal surgery ,Patient-reported outcome ,0305 other medical science ,business - Abstract
Patient Reported Outcome and Experience Measures (PROMs and PREMs) play an increasingly important role in monitoring the quality of the oncological pathway. The aim of this study is to describe the case of five hospitals a year after the adoption of PROMs and PREMs for robotic oncological colorectal surgery in Tuscany and to investigate how the clinicians can impact the process of implementation and the efficacy of such measures. We used 14 months of data from the five robotic centers in Tuscany. Above all, the physician's personal motivation to improve the treatment of patients, the teamwork, and the possibility to use data for research purposes proved to be the essential factors for their engagement and the successful implementation of patient reported measures. Physicians play a key role in the adoption of systematic PROMs and PREMs. The higher their level of engagement, the higher the collection success, both in terms of number of patients enrolled and response rates. Moreover, the collection of patient reported measures may become part of physicians' daily practice and may lead to a change in their relationship and communication with patients, as clinicians accept to have their job reviewed and are not afraid to be evaluated by their patients.
- Published
- 2020
38. Large Flow Separations around a Generic Submarine in Static Drift Motion Resolved by Various Turbulence Closure Models
- Author
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Adrian Lungu
- Subjects
numerical simulation ,DARPA Suboff ,turbulent separated flow ,turbulence modeling ,Ocean Engineering ,Water Science and Technology ,Civil and Structural Engineering - Abstract
A thorough numerical introspection for assessing the particular issues of large flow separations around a submersible hull by using various turbulence models is described. The generic Defense Advanced Research Projects Agency (DARPA hereafter) Suboff hull is considered in the present study. Detailed descriptions of the mathematics behind the hybrid Shear Stress Transport (SST), Detached Eddy Simulation (DES) and the Improved Delayed Detached Eddy Simulation (IDDES) are given. The ISIS solver of the FineTM/Marine package is used to solve the flow problems. An adaptive mesh refinement is employed for resolving the flow inside the areas hosting significant flow gradients. Two sets of computations are analyzed: one refers to the straight-ahead course, whereas the other is focused on the static drift motions. Four angles of incident flow and three different incoming flow velocities are proposed for clarifying the details of the flow separation. Extensive grid convergence tests are performed for both working regimes and for all the meshes used in the present investigation. Extended verification and validation (V&V hereafter) of the numerical approach is performed through extensive comparisons with the experimental data. Global hydrodynamic performance of the hull as well as the local flow features are discussed in detail. The study is concluded by a series of final remarks aimed at providing useful information for further similar investigations.
- Published
- 2022
39. A DES-based study of the flow around the self-propelled DARPA Suboff working in deep immersion and beneath the free-surface
- Author
-
Adrian Lungu
- Subjects
Environmental Engineering ,Ocean Engineering - Published
- 2022
40. Numerical Simulation of the Resistance and Self-Propulsion Model Tests1
- Author
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Adrian Lungu
- Subjects
Computer simulation ,business.industry ,Mechanical Engineering ,Computation ,020101 civil engineering ,Ocean Engineering ,02 engineering and technology ,0201 civil engineering ,Physics::Fluid Dynamics ,Self propulsion ,Hull ,Aerospace engineering ,business ,Geology - Abstract
The paper proposes a series of numerical investigations performed to test and demonstrate the capabilities of a Reynolds-averaged Navier–Stokes equation (RANSE) solver in the area of complex ship flow simulations. The focus is on a complete numerical model for hull, propeller, and rudder that can account for the mutual interaction between these components. The paper presents the results of a complex investigation of the flow computations around the hull model of the 3600 TEU MOERI containership (KCS hereafter). The resistance for the hull equipped with a rudder, the propeller open-water (POW hereafter) computations, as well as the self-propulsion simulation are presented. Comparisons with the experimental data provided at the Tokyo 2015 Workshop on Computational Fluid Dynamics (CFD) in Ship Hydrodynamics are given to validate the numerical approach in terms of the total and wave resistance coefficients, sinkage and trim, thrust and torque coefficients, propeller efficiency, and local flow features. Verification and validation based on the grid convergence tests are performed for each computational case. Discussions on the efficiency of the turbulence models used in the computations as well as on the main flow features are provided aimed at clarifying the complex structure of the flow around the ship stern.
- Published
- 2019
41. Insights on the effectiveness of reward schemes from 10‐year longitudinal case studies in 2 Italian regions
- Author
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Milena Vainieri, Sabina Nuti, and Daniel Adrian Lungu
- Subjects
Computer science ,Pay for performance ,03 medical and health sciences ,0302 clinical medicine ,Reward ,Humans ,030212 general & internal medicine ,Longitudinal Studies ,Set (psychology) ,Reimbursement, Incentive ,Research Articles ,Quality of Health Care ,Actuarial science ,030503 health policy & services ,Health Policy ,Corporate governance ,Quality Improvement ,incentive ,Variable (computer science) ,Incentive ,Italy ,Qualitative longitudinal ,Key (cryptography) ,Performance improvement ,0305 other medical science ,performance ,Research Article - Abstract
Background Pay for performance (P4P) programs have been widely analysed in literature, and the results regarding their impact on performance are mixed. Moreover, in the real-life setting, reward schemes are designed combining multiple elements altogether, yet, it is not clear what happens when they are applied using different combinations. Objectives To provide insights on how P4P programs are influenced by 5 key elements: whom, what, how, how many targets, and how much to reward. Methods A qualitative longitudinal analysis of 10 years of P4P reward schemes adopted by the regional administrations of Tuscany and Lombardy (Italy) was conducted. The effects of the P4P features on performance are discussed considering both overall and specific indicators. Results Both regions applied financial reward schemes for General Managers by linking the variable pay to performance. While Tuscany maintained a relatively stable financial incentive design and governance tools, Lombardy changed some elements of the design and introduced, in 2012, a P4P program aimed to reward the providers. The main differences between the 2 cases regard the number of targets (how many), the type (what), and the method applied to set targets (how). Conclusion Considering the overall performance obtained by the 2 regions, it seems that whom, how, and how much to reward are not relevant in the success of P4P programs; instead, the number (how many) and the type (what) of targets set may influence the performance improvement processes driven by financial reward schemes.
- Published
- 2018
42. Clin J Am Soc Nephrol
- Author
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Lukas Kaltenegger, Karlien Cransberg, Timo Jahnukainen, Runolfur Palsson, Jaap W. Groothoff, Marjolein Bonthuis, Era-Edta Registry, Etienne Bérard, Jérôme Harambat, Ali Duzova, Elisabeth Maurer, Adrian Lungu, Kitty J Jager, Liliana Garneata, Manish D. Sinha, Maria Herthelius, Sara Testa, Gema Ariceta, Bordeaux population health (BPH), Université de Bordeaux (UB)-Institut de Santé Publique, d'Épidémiologie et de Développement (ISPED)-Institut National de la Santé et de la Recherche Médicale (INSERM), Pediatrics, ACS - Pulmonary hypertension & thrombosis, APH - Quality of Care, APH - Aging & Later Life, APH - Methodology, Medical Informatics, AGEM - Inborn errors of metabolism, ARD - Amsterdam Reproduction and Development, Paediatric Nephrology, and APH - Global Health
- Subjects
Male ,medicine.medical_specialty ,Adolescent ,Epidemiology ,medicine.medical_treatment ,030232 urology & nephrology ,Renal function ,Kidney ,Critical Care and Intensive Care Medicine ,LEHA ,Peritoneal dialysis ,03 medical and health sciences ,0302 clinical medicine ,Renal Dialysis ,Interquartile range ,030225 pediatrics ,Internal medicine ,medicine ,Humans ,Registries ,Child ,Dialysis ,Kidney transplantation ,Transplantation ,business.industry ,Hazard ratio ,Infant ,Recovery of Function ,Original Articles ,medicine.disease ,3. Good health ,Europe ,Nephrology ,Child, Preschool ,Female ,Kidney Diseases ,[SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie ,Hemodialysis ,business - Abstract
Background and objectives Data on recovery of kidney function in pediatric patients with presumed ESKD are scarce. We examined the occurrence of recovery of kidney function and its determinants in a large cohort of pediatric patients on maintenance dialysis in Europe. Design, setting, participants, & measurements Data for 6574 patients from 36 European countries commencing dialysis at an age below 15 years, between 1990 and 2014 were extracted from the European Society for Pediatric Nephrology/European Renal Association-European Dialysis and Transplant Association Registry. Recovery of kidney function was defined as discontinuation of dialysis for at least 30 days. Time to recovery was studied using a cumulative incidence competing risk approach and adjusted Cox proportional hazard models. Results Two years after dialysis initiation, 130 patients (2%) experienced recovery of their kidney function after a median of 5.0 (interquartile range, 2.0–9.6) months on dialysis. Compared with patients with congenital anomalies of the kidney and urinary tract, recovery more often occurred in patients with vasculitis (11% at 2 years; adjusted hazard ratio [HR], 20.4; 95% confidence interval [95% CI], 9.7 to 42.8), ischemic kidney failure (12%; adjusted HR, 11.4; 95% CI, 5.6 to 23.1), and hemolytic uremic syndrome (13%; adjusted HR, 15.6; 95% CI, 8.9 to 27.3). Younger age and initiation on hemodialysis instead of peritoneal dialysis were also associated with recovery. For 42 patients (32%), recovery was transient as they returned to kidney replacement therapy after a median recovery period of 19.7 (interquartile range, 9.0–41.3) months. Conclusions We demonstrate a recovery rate of 2% within 2 years after dialysis initiation in a large cohort of pediatric patients on maintenance dialysis. There is a clinically important chance of recovery in patients on dialysis with vasculitis, ischemic kidney failure, and hemolytic uremic syndrome, which should be considered when planning kidney transplantation in these children.
- Published
- 2018
43. Verification and validation study for the total ship resistance of the DTMB 5415 ship model
- Author
-
Adham Bekhit and Adrian Lungu
- Subjects
Physics::Fluid Dynamics ,lcsh:VM1-989 ,lcsh:Ocean engineering ,lcsh:TC1501-1800 ,lcsh:Naval architecture. Shipbuilding. Marine engineering ,CFD, ship resistance, free-surface flow, RANSE, verification and validation - Abstract
The present study describes the viscous flow simulation of the bare hull ship resistance of the DTMB 5415 model ship. The study includes computations for ship resistance as well as free-surface and sinkage and trim prediction for three different Froude numbers. Computations are performed using the ISIS-CFD solver included in FineTM/Marine software available under the NUMECA suite where the discretization in space is based on finite volume method using unstructured grid. The Reynolds Average Navier-Stokes equations are numerically solved in a quasi-static approach where the turbulence is modeled by making use of the k-ω SST model. Four different computational grids were generated for performing a verification and validation study based on Richardson extrapolation method. Results are compared with the benchmark experimental data provided in the Gothenburg workshop on CFD in ship hydrodynamics in 2010. Validation of the numerical results shows a reasonable agreement with the experimental data.
- Published
- 2017
44. Numerical simulation of a cavitating propeller working in open water
- Author
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Adrian Lungu
- Subjects
Physics::Fluid Dynamics ,lcsh:VM1-989 ,lcsh:Ocean engineering ,lcsh:TC1501-1800 ,lcsh:Naval architecture. Shipbuilding. Marine engineering ,Numerical simulation, ONRT tumblehome, RANSE, turbulence, vortical flow, cavitation - Abstract
A viscous open water flow investigation around a four blade propeller model which equips the ONRT tumblehome is described in the present paper. The main purpose of the present study is that of establishing an appropriate method for computing the flow solution around a propeller working under the imminence of cavitation occurrence. The ISISCFD solver of FINETM/Marine software package is used to fulfill the task. The Reynoldsaveraged Navier-Stokes equations in which the turbulence is modeled with the EASM model are numerically solved by using a finite-volume based method. The performance diagrams of the propeller are computed for a range of advance coefficient between 0 and 1. Comparisons with the experimental data are provided to validate the numerical approach. A detailed analysis of the flow field structure as well as of the vortical character of the flow behind the propeller is provided. A special attention will be paid to the cavitation regime for which a particular model will be proposed.
- Published
- 2017
45. Long-range magnetic interaction in Mn $$_{x}$$ x Ge $$_{1-x}$$ 1 - x : structural, spectromicroscopic and magnetic investigations
- Author
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Nicoleta G. Apostol, C. M. Teodorescu, Laura Elena Abramiuc, Alexey Barinov, D. Macovei, George-Adrian Lungu, Ioana Cristina Bucur, Liviu Cristian Tanase, Cristian-Alexandru Tache, and Ruxandra M. Costescu
- Subjects
Materials science ,Kerr effect ,Extended X-ray absorption fine structure ,Mechanical Engineering ,Analytical chemistry ,chemistry.chemical_element ,02 engineering and technology ,Substrate (electronics) ,Manganese ,021001 nanoscience & nanotechnology ,01 natural sciences ,Crystallography ,Chemical state ,X-ray photoelectron spectroscopy ,chemistry ,Mechanics of Materials ,0103 physical sciences ,General Materials Science ,010306 general physics ,0210 nano-technology ,Spectroscopy ,Molecular beam epitaxy - Abstract
We report the structural, electronic and magnetic investigation using extended X-ray absorption fine structure spectroscopy (EXAFS), photoelectron microscopy, spin-resolved photoemission and magneto-optical Kerr effect on the properties of Mn $$_{x}$$ Ge $$_{1-x}$$ systems obtained by molecular beam epitaxy deposition of manganese on Ge(001) wafers annealed on temperatures between 50 and 450 $$^{\circ }$$ C. Magnetic ordering can be achieved when the substrate temperature is higher than 250 $$^{\circ }$$ C, when the manganese tends to diffuse into the Ge matrix and segregate in Mn $$_{5}$$ Ge $$_{3}$$ -like compounds, as proved by EXAFS. High spatial resolution photoelectron spectroscopy reveals Mn inhomogeneities in the 5–10 $$\upmu $$ m range, even though Mn is found mostly in the same chemical state all over the surface.
- Published
- 2016
46. Trial computations of the free-surface flow around a bulk carrier ship model
- Author
-
Adrian Lungu
- Subjects
Physics::Fluid Dynamics ,lcsh:VM1-989 ,lcsh:Ocean engineering ,lcsh:TC1501-1800 ,lcsh:Naval architecture. Shipbuilding. Marine engineering ,Numerical simulation, JBC, RANSE, free-surface flow, turbulence - Abstract
A comprehensive viscous flow investigation around the Japan Bulk Carrier bare ship model is described in the present paper. The aim of the investigation is that of the necessity of calibration for the FINETM/Marine component of the NUMECA solver for further deeper numerical investigations. The global hydrodynamic resistance components, freesurface elevation, wake structure in the propeller plane as well as the trim and sinkage values are computed by using the ISIS-CFD numerical solver for the Reynolds-averaged Navier-Stokes equations in which the turbulence is modeled with the k-ω SST model. Comparisons with the experimental data are provided to validate the numerical approach.
- Published
- 2016
47. Numerical prediction of the performances of a non-cavitating propeller working in open water
- Author
-
Adrian Lungu
- Subjects
numerical simulation, propeller, RANSE, open water test, turbulence ,lcsh:VM1-989 ,lcsh:Ocean engineering ,lcsh:TC1501-1800 ,lcsh:Naval architecture. Shipbuilding. Marine engineering - Abstract
The present study describes a 3D numerical simulation of the viscous flow around a five blade propeller model, as an intermediate step in developing a robust technique for a further investigation of the flow around a self-propelled ship hull. Several computations are performed by using either the FINETM/Marine component of the NUMECA suite, or the ANSYS CFX to estimate through the comparisons with the available experimental the level of accuracy of each of the two solvers. For the sake of similarity, in both cases the numerical simulation is based on the unsteady solution for the Reynolds-averaged NavierStokes (RANS hereafter) equations in which the turbulence is modeled with the k-ω SST model. The global hydrodynamic forces, moments and efficiency are computed for eight different advance coefficients to draw the open water diagram. A few introspections into the propeller freestream structure will be performed as well.
- Published
- 2016
48. Scale Effects on a Tip Rake Propeller Working in Open Water
- Author
-
Adrian Lungu
- Subjects
Discretization ,Computer science ,Full scale ,Ocean Engineering ,02 engineering and technology ,DES turbulence model ,01 natural sciences ,010305 fluids & plasmas ,lcsh:Oceanography ,lcsh:VM1-989 ,0103 physical sciences ,lcsh:GC1-1581 ,Water Science and Technology ,Civil and Structural Engineering ,Finite volume method ,Computer simulation ,Numerical analysis ,Rake ,Propeller ,lcsh:Naval architecture. Shipbuilding. Marine engineering ,Solver ,021001 nanoscience & nanotechnology ,TRP propeller ,viscous flow simulation ,ITTC benchmark ,scale effect ,0210 nano-technology ,Marine engineering - Abstract
The scale effect on the accuracy of a numerical simulation in ship hydrodynamics represents an important issue of the propeller numerical analysis. To grasp a better understanding on the influence of this effect, an introspection on the performances of an unconventional propeller is proposed in the present study. The paper describes an investigation of the performances of a tip rake propeller recently chosen as benchmark by the International Towing Tank Conference organization (ITTC hereafter). The numerical simulation is carried out by making use of the ISIS-CFD solver, part of the FineTM/Marine package available in the NUMECA suite. The solver is based on the finite volume method to build the spatial discretization of the governing equations. The incompressible unsteady Reynolds Averaged Navier-Stokes Equations (RANSE) are solved in a global approach. Reported solutions are compared with the experimental data provided by Schiffbau-Versuchsanstalt (SVA) Potsdam GmbH to validate the accuracy of the numerical approach. Since for the full scale the experimental data could not be possible, the ITTC&rsquo, 78 extrapolation method-based proposed by the SVA Potsdam has been taken as a basis for comparisons and discussions. A set of remarks will conclude the paper by providing some guidelines for further approaches in terms of the particulars of the numerics that may be further employed in similar studies.
- Published
- 2019
- Full Text
- View/download PDF
49. Resistance hysteresis correlated with synchrotron radiation surface studies in atomic sp
- Author
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Nicoleta Georgiana, Apostol, Daniel, Lizzit, George Adrian, Lungu, Paolo, Lacovig, Cristina Florentina, Chirilă, Lucian, Pintilie, Silvano, Lizzit, and Cristian Mihai, Teodorescu
- Abstract
Carbon layers are deposited on 100 nm thick atomically clean (001) lead zirconate titanate (PZT) in ultrahigh vacuum, ruling out the presence of any contaminants. X-ray photoelectron spectroscopy is used to assess the substrate surface or interface composition, substrate polarization and the thickness of carbon layers, which ranges from less than one monolayer (1 ML) of graphene to several monolayers. Atomically clean PZT(001) exhibit inwards polarization, and this polarization reverses the sign upon carbon deposition. Cationic vacancies are detected near the PZT surface, consistent with heavy p doping of these films near the surface. The carbon layers exhibited a consistent proportion of atoms forming in-plane sp
- Published
- 2019
50. Numerical Simulation for Predicting Ship Resistance and Vertical Motions in Regular Head Waves
- Author
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Adrian Lungu and Adham S. Bekhit
- Subjects
Physics ,Computer simulation ,Turbulence ,business.industry ,Computation ,Computer software ,Head (vessel) ,Mechanics ,Computational fluid dynamics ,Navier–Stokes equations ,business - Abstract
The present study is concerned with predicting the resistance and vertical motions of the surface combatant DTMB5512 ship model in regular head waves. A series of numerical simulations are performed for various wave lengths, heights and different ship speeds. Computations are performed by making use of the ISIS-CFD solver of the commercial software Fine™/Marine provided by NUMECA, where the discretization in space is based on finite volume method using unstructured grid. The unsteady Reynolds-Averaged Navier-Stokes equations are numerically solved while the turbulence is modeled by making use of the k-ω SST model. The free-surface is captured through an air-water interface based on the Volume of Fluid (VOF) method. Computed results are validated through direct comparisons with the experimental data provided by IIHR test cases. For the sake of numerical results verification, a grid convergence study is performed on four computational grids and a time step convergence test is also included. Validation of the numerical results shows a reasonable agreement with the experimental data.
- Published
- 2019
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