253 results on '"Lotfi K"'
Search Results
2. A CHARACTERIZATION OF MEIXNER ORTHOGONAL POLYNOMIALS VIA A CERTAIN TRANSFERT OPERATOR
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Emna Abassi and Lotfi Khériji
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orthogonal polynomials, regular form, meixner polynomials, divided-difference operator, transfert operator, hahn property ,Mathematics ,QA1-939 - Abstract
Here we consider a certain transfert operator \(\mathrm{M}_{(c,\omega)}=I_{\mathcal{P}}-c \, \tau_{\omega},\) \(\omega\neq0,\) \({c \in \mathbb{R}-\{0,1\},}\) and we prove the following statement: up to an affine transformation, the only orthogonal sequence that remains orthogonal after application of this transfert operator is the Meixner polynomials of the first kind.
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- 2024
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3. PO-1459 Patients’ feelings concerning the approach of sexuality by the radiation oncologist
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khissal, B.A., primary, Meriem, B., additional, Zeineb, N., additional, Imene, A., additional, Dorra, A., additional, and Lotfi, K., additional
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- 2022
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4. A comprehensive survey on an IoT-based smart public street lighting system application for smart cities
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Siwar Khemakhem and Lotfi Krichen
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Internet of things (IOT) ,Smart public street lighting ,Smart poles ,Leds technology ,Communication network ,Monitoring unit ,Technology - Abstract
The swift advancement and updating of urban lighting systems, along with the incorporation of smart and Internet of Things (IoT) infrastructure, have opened up numerous opportunities for technological progress across various facets of life. This paper offers a comprehensive overview on the development of smart public street lighting infrastructure tailored for IoT applications in smart cities. Initially, the focus lies on transitioning from conventional lighting to Light-Emitting Diodes (LEDs) technology in street lighting. Complementing this transition, the incorporation of the wireless networked sensors and controllers ensures dynamic brightness control in operational zones, envisioning substantial energy savings. Furthermore, the notion characterizing smart cities denotes incorporating modern digital infrastructures to develop innovative functionalities and connect various application, following the IoT paradigm. The key findings from the proposed study have enhanced knowledge regarding smart public street lighting application. This system integrates smart poles equipped with LEDs lamps technology, smart sensors, communication network and monitoring unit, leveraging current technological advancements in IoT applications. The implementation of IoT-based smart public street lighting systems presents several challenges, including integrating diverse sensors and actuators ensuring robust device communication, secure data management, and effective system scaling and maintenance. Despite these challenges, this system significantly advances smart city infrastructure by enhancing energy efficiency, safety, and sustainability. However, addressing their high initial costs, data privacy and security concerns, and ongoing maintenance are crucial in future studies to realize their full potential in smart cities.
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- 2024
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5. Fitting a mixture-based response surface using computer simulation.
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Lotfi K. Gaafar and Tariq A. Aldowaisan
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- 1994
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6. Automatic model initialization for real-time decision support.
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Lotfi K. Gaafar and Javeed Shaik
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- 1993
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7. Frequent and long-term follow-up of health-related quality of life following allogeneic haematopoietic stem cell transplantation
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Frödin, U., Lotfi, K., Fomichov, V., Juliusson, G., and Börjeson, S.
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- 2015
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8. Potential of E-Learning Interventions and Artificial Intelligence–Assisted Contouring Skills in Radiotherapy: The ELAISA Study
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Mathis Ersted Rasmussen, Kamal Akbarov, Egor Titovich, Jasper Albertus Nijkamp, Wouter Van Elmpt, Hanne Primdahl, Pernille Lassen, Jon Cacicedo, Lisbeth Cordero-Mendez, A.F.M. Kamal Uddin, Ahmed Mohamed, Ben Prajogi, Kartika Erida Brohet, Catherine Nyongesa, Darejan Lomidze, Gisupnikha Prasiko, Gustavo Ferraris, Humera Mahmood, Igor Stojkovski, Isa Isayev, Issa Mohamad, Leivon Shirley, Lotfi Kochbati, Ludmila Eftodiev, Maksim Piatkevich, Maria Matilde Bonilla Jara, Orges Spahiu, Rakhat Aralbayev, Raushan Zakirova, Sandya Subramaniam, Solomon Kibudde, Uranchimeg Tsegmed, Stine Sofia Korreman, and Jesper Grau Eriksen
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
PURPOSEMost research on artificial intelligence–based auto-contouring as template (AI-assisted contouring) for organs-at-risk (OARs) stem from high-income countries. The effect and safety are, however, likely to depend on local factors. This study aimed to investigate the effects of AI-assisted contouring and teaching on contouring time and contour quality among radiation oncologists (ROs) working in low- and middle-income countries (LMICs).MATERIALS AND METHODSNinety-seven ROs were randomly assigned to either manual or AI-assisted contouring of eight OARs for two head-and-neck cancer cases with an in-between teaching session on contouring guidelines. Thereby, the effect of teaching (yes/no) and AI-assisted contouring (yes/no) was quantified. Second, ROs completed short-term and long-term follow-up cases all using AI assistance. Contour quality was quantified with Dice Similarity Coefficient (DSC) between ROs' contours and expert consensus contours. Groups were compared using absolute differences in medians with 95% CIs.RESULTSAI-assisted contouring without previous teaching increased absolute DSC for optic nerve (by 0.05 [0.01; 0.10]), oral cavity (0.10 [0.06; 0.13]), parotid (0.07 [0.05; 0.12]), spinal cord (0.04 [0.01; 0.06]), and mandible (0.02 [0.01; 0.03]). Contouring time decreased for brain stem (–1.41 [–2.44; –0.25]), mandible (–6.60 [–8.09; –3.35]), optic nerve (–0.19 [–0.47; –0.02]), parotid (–1.80 [–2.66; –0.32]), and thyroid (–1.03 [–2.18; –0.05]). Without AI-assisted contouring, teaching increased DSC for oral cavity (0.05 [0.01; 0.09]) and thyroid (0.04 [0.02; 0.07]), and contouring time increased for mandible (2.36 [–0.51; 5.14]), oral cavity (1.42 [–0.08; 4.14]), and thyroid (1.60 [–0.04; 2.22]).CONCLUSIONThe study suggested that AI-assisted contouring is safe and beneficial to ROs working in LMICs. Prospective clinical trials on AI-assisted contouring should, however, be conducted upon clinical implementation to confirm the effects.
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- 2024
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9. PIN58 The U.S. International Trade of Medical Products in the COVID-19 Era
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Preciado, S.M., primary, Lotfi, K., additional, Seoane-Vazquez, E., additional, Rodriguez-Monguio, R., additional, and Brancazio, P., additional
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- 2021
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10. Association of ABCB1 polymorphisms with survival and in vitro cytotoxicty in de novo acute myeloid leukemia with normal karyotype
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Gréen, H, Falk, I J, Lotfi, K, Paul, E, Hermansson, M, Rosenquist, R, Paul, C, and Nahi, H
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- 2012
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11. A prospective evaluation of patients' health-related quality of life during auto-SCT: a 3-year follow-up
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Frödin, U, Börjeson, S, Lyth, J, and Lotfi, K
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- 2011
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12. A particle swarm-based genetic algorithm for scheduling in an agile environment
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Gaafar, Lotfi K., Masoud, Sherif A., and Nassef, Ashraf O.
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- 2008
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13. On the well posedness of a mathematical model for a singular nonlinear fractional pseudo-hyperbolic system with nonlocal boundary conditions and frictional damping terms
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Said Mesloub, Hassan Altayeb Gadain, and Lotfi Kasmi
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pseudo-hyperbolic system ,energy inequality ,existence and uniqueness ,iterative method ,weak solution ,sobolev fractional space ,nonlocal boundary condition ,Mathematics ,QA1-939 - Abstract
This paper is devoted to the study of the well-posedness of a singular nonlinear fractional pseudo-hyperbolic system with frictional damping terms. The fractional derivative is described in Caputo sense. The equations are supplemented by classical and nonlocal boundary conditions. Upon some a priori estimates and density arguments, we establish the existence and uniqueness of the strongly generalized solution for the associated linear fractional system in some Sobolev fractional spaces. On the basis of the obtained results for the linear fractional system, we apply an iterative process in order to establish the well-posedness of the nonlinear fractional system. This mathematical model of pseudo-hyperbolic systems arises mainly in the theory of longitudinal and lateral vibrations of elastic bars (beams), and in some special case it is propounded in unsteady helical flows between two infinite coaxial circular cylinders for some specific boundary conditions.
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- 2024
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14. Fixed-quantity dynamic lot sizing using simulated annealing
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Gaafar, Lotfi K., Nassef, Ashraf O., and Aly, Ahmed I.
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- 2009
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15. Exploring Cold plasma technology: Enhancements in Carob seed germination, phytochemical Composition, and antioxidant activity
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Khadija Ben Othman, Mohamed Majdi Cherif, Imen Assadi, Walid Elfalleh, Lotfi Khezami, Achraf Ghorbal, and Aymen Amine Assadi
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Carob seeds ,Ceratonia siliqua L. ,Cold plasma ,Germination ,Phytochemicals ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
The cultivation of carob tree does not need many climatic and ecological requirements. The main limit to its large-scale cultivation is the defects for propagation with seeds. Addressing this, our study evaluated the effect of cold plasma pretreatment on carob seed germination.Impressively, cold plasma showcased beneficial effects by significantly increasing water uptake in seeds (CS: 1.71 ± 0.59; PS/3.99 ± 1.56) and decreasing the contact angle from 80.7° to 57.9°, enhancing the seed surface's hydrophilicity. While the germination rate enhancement was subtle, the treatment presented an innovative route to modifying the seed's physiochemical properties. Specifically, storage proteins like albumin, globulin, and prolamin were notably reduced (Albumin (from 7.67 to 4.95 mg/g DW), Globulin (from 8.52 to 5.80 mg/g DW) and Prolamin (from 3.53 to 1.66 mg/g DW)). Additionally, there was a decline in the overall content of polyphenols (from 846.88 to 760.94 mg GAE/100g DW) and flavonoids (from 790.93 to 502.95 mg GAE/100g DW) and a decrease in the ferric reducing power (from 34.48 to 26.39 mg AAE/g DW). However, radical scavenging activity remained consistent. Intriguingly, FTIR-ATR spectral analysis post plasma treatment indicated oxidative alterations in the seed coat, marked by a distinctive intensity at 1732 cm⁻1.This investigation suggests that the application of eco-friendly technology could provide improvements in seed surface's hydrophilicity, but appropriate conditions could be chosen to increase germination efficiency.
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- 2024
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16. Pain assessments during autologous stem cell transplantation: P1420
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Lyth, J., Börjeson, S., Lotfi, K., and Frödin, U.
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- 2011
17. PCN200 ASSESSMENT OF THE SAFETY OF ONCOLOGY THERAPEUTIC BIOLOGIC DRUGS USING THE US FDA ADVERSE EVENT REPORTING SYSTEM
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Lotfi, K., primary, Althobaiti, H., additional, Rodriguez-Monguio, R., additional, and Seoane-Vazquez, E., additional
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- 2020
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18. A neural network model for solving the lot-sizing problem
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Gaafar, Lotfi K. and Choueiki, M. Hisham
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Economics -- Models ,Business ,Business, general - Abstract
Artificial neural network models have been used successfully to solve demand forecasting and production scheduling problems; the two steps that typically precede and succeed Material Requirements Planning (MRP). In this paper, a neural network model is applied to the MRP problem of lot-sizing. The model's performance is evaluated under different scenarios and is compared to common heuristics that address the same problem. Results show that the developed artificial neural network model is capable of solving the lot-sizing problem with notable consistency and reasonable accuracy. Keywords: Neural network models; Lot-sizing; Heuristics; Design of experiments
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- 2000
19. The beta cell glucokinase promoter variant is an unlikely risk factor for diabetes mellitus
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Lotfi, K., Sund, G., Lowe, R., Graham, J., Landin-Olsson, M., Kockum, I., Deeb, S., Lernmark, Å., and the Diabetes Incidence Studyin Sweden (DISS)
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- 1997
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20. Optimum design of space structures by combining genetic algorithms and simulated annealing using a response surface approximation
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Salajegheh, E., primary and Lotfi, K., additional
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- 2002
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21. Cu-Doped TiO2 Thin Films by Spin Coating: Investigation of Structural and Optical Properties
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Syrine Sassi, Amal Bouich, Anouar Hajjaji, Lotfi Khezami, Brahim Bessais, and Bernabé Mari Soucase
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titanium dioxide TiO2 nanoparticles ,copper Cu doping ,perovskite solar cells PSCs ,electron transport layer ETL ,Inorganic chemistry ,QD146-197 - Abstract
Cu-doped TiO2 films were synthesized directly on FTO glass with a spin coating method. With a variation in copper amount, samples were prepared with 0%, 1%, 2%, 4% and 8% of dopant concentrations. Morphological and structural characterization of undoped and Cu-doped TiO2 samples were investigated and the obtained results showed the small, spherical shapes of the nanoparticles forming a thin film on top of FTO glass and their preferred orientation of TiO2 anatase (101), which is the same for each sample. However, this peak exhibited a slight shift for the 2% sample, related to the inflation of the microstrain compared to the other samples. For the optical properties, the 4% sample displayed the highest transmittance whereas the 2% sample exhibited the lowest band gap energy of 2.96 eV. Moreover, the PL intensity seems to be at its highest for the 2% sample due to the present peaking defects in the structure, whereas the 8% sample shows a whole new signal that is related to copper oxide. These properties make this material a potential candidate to perform as an electron transport layer (ETL) in solar cells and enhance their power conversion efficiency.
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- 2024
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22. Monitoring oral cyclosporine therapy
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Lotfi, K, Peterson, C, and Juliusson, G
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- 2005
23. Impulsive choice in individuals with comorbid amphetamine use disorder and attention deficit-hyperactivity disorder
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Christoffer Brynte, Lotfi Khemiri, Hannes Stenström, Maija Konstenius, Nitya-Jayaram Lindström, and Johan Franck
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ADHD ,Substance use disorder ,Impulsive behavior ,Psychiatry ,RC435-571 - Abstract
Abstract Background Amphetamine use disorder (AMPH) and attention deficit-hyperactivity disorder (ADHD) often co-occur and are associated with poor treatment outcomes. Elevated impulsivity is a core feature in both disorders. Little is known however about the specific neurocognitive profile regarding different facets of impulsivity, and specifically impulsive choice, in comorbid populations. Methods Three groups (ADHD + AMPH, ADHD only and healthy controls (HC)) were assessed with self-reported impulsivity and cognitive tasks of impulsive choice, operationalized as delay aversion (DA) and reflection impulsivity. Results Twenty-nine participants with comorbid ADHD + AMPH, 25 participants with ADHD only and 116 HC completed screening, including self-rating scales, and cognitive testing. 20, 16 and 114 participants completed computerized cognitive tasks in the ADHD + AMPH group, ADHD group and HC group, respectively. The ADHD + AMPH group reported significantly higher motor, attentional and non-planning impulsiveness, and showed a significantly higher degree of impulsive choice, compared to both groups. There were no differences in task-related impulsiveness between ADHD only and HC. Conclusions The current findings suggest that individuals with ADHD + AMPH have overall elevated levels of impulsivity compared to individuals with ADHD only. In addition, that ADHD + AMPH is specifically associated with impairments in task-related impulsive choice, which was not found in ADHD only compared to HC. The neurocognitive profile in this specific patient group may represent a need for more systematic screening within healthcare settings in order to develop effective and targeted treatment for comorbid patients. Trial registration EudraCT, 2012–004298-20.
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- 2023
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24. Rethinking the paradigmatic frameworks of performance measurement systems in the light of recurring globalized crises
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Sonia Snadli, Wafa Khlif, and Lotfi Karoui
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performance management systems ,crises ,complexity ,managerial doxa ,Business ,HF5001-6182 ,Accounting. Bookkeeping ,HF5601-5689 - Abstract
Research question: Is the failure of performance measurement systems (PMS) due to the crisis in itself or to a radical change in the paradigm that governs the world that has caused a loss of momentum? Motivation: In the era of recurrent/multiple crises, some researchers have signaled the inadequacy of the industrial economics paradigm and the managerial tools arising from them, and their inability to address the new characteristics of the environmental context. On this subject, we wonder whether the observed "malaise" of PMS is due to a possible paradigmatic obsolescence. If necessary, a redefinition of these systems should be considered so that the indicators regain their relevance. Idea: In recent decades, crisis meant no more than a temporary disruption of an idealized situation. The recurrence of systemic natural, social, economic and other crises and the ensuing volatile, uncertain, complex and ambiguous business environment has become the rule and we need to reappraise the capacity for our tools to grasp the complex reality of our world. Data/Tools: Building on complexity theory authors, the article aims to critically reflect on the paradigmatic foundations that give meaning (or not) to PMS. Findings: The recurrence of crises reflects an obsolescence of the dominant economic and managerial paradigm advocating determinism, simplicity and certainty/predictability. PMS must be redefined in order to regain their relevance in line with the paradigm characterized by volatility, complexity, uncertainty and ambiguity. Contribution: This paper makes two major contributions. First, we deconstruct the dominant model of performance assessment and measurement based on mechanistic industrial economics highlighting the limitations of traditional accounting methods in capturing the complex and dynamic nature of modern business environments. Second, we describe the main characteristics of the new business landscape and the original understanding of crisis to highlight the need to review traditional approaches to accounting indicators and performance measurement in this context of a complex, uncertain world.
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- 2023
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25. Maintaining the validity of simulation models using prediction intervals
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Gaafar, Lotfi K.
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Simulation of computer systems -- Analysis ,Flexible manufacturing systems -- Analysis ,Manufacturing industry -- Research - Abstract
This paper presents a methodology for maintaining the operational validity of simulation models of observable systems in order to support operational decisions. In this methodology, real-time system data are continuously compared against simultaneous prediction intervals on selected responses constructed using the simulation model. The methodology is illustrated through using a case example of a simulation model of a flexible manufacturing system. Different invalidating discrepancies between the model and the system are investigated. Results indicate that using nontraditional responses may lead to a faster detection of invalidating changes, the speed of detection is a function of the scope of the change, and the model may evolve with the system and continue to be used to guard against random changes. Keywords: Simulation; Validation; Operational decisions; Prediction intervals
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- 1999
26. Prospective Comparison of Thulium and Holmium Laser Lithotripsy for the Treatment of Upper Urinary Tract Lithiasis
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Bertrand Delbarre, Faris Baowaidan, Thibault Culty, Lotfi Khelfat, Marie Brassier, Matthieu Ferragu, Alexandre Magnier, Alexandre Secourgeon, Francois Tariel, Souhil Lebdai, and Pierre Bigot
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Urolithiasis ,Ureteroscopy ,Laser lithotripsy ,Holmium ,Thulium ,Stone free ,Diseases of the genitourinary system. Urology ,RC870-923 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Background: Lithotripsy with holmium:yttrium-aluminum-garnet (Ho:YAG) laser is the current gold standard for treating stones of the upper urinary tract (UUT). The recently introduced thulium fiber laser (TFL) has the potential to be more efficient and as safe as Ho:YAG. Objective: To compare the performance and complications between Ho:YAG and TFL for UUT lithotripsy. Design, setting, and participants: This was a prospective single-center study of 182 patients treated between February 2021 and February 2022. In a consecutive approach, laser lithotripsy was performed via ureteroscopy with Ho:YAG for 5 mo, and then with TFL for 5 mo. Outcome measurements and statistical analysis: Our primary outcome was stone-free (SF) status at 3 mo after ureteroscopy with Ho:YAG versus TFL lithotripsy. Secondary outcomes were complication rates and results regarding the cumulative stone size. Patients were followed at 3 mo with abdominal imaging (ultrasound or computed tomography). Results and limitations: The study cohort comprised 76 patients treated with Ho:YAG laser and 100 patients treated with TFL. Cumulative stone size was significantly higher in the TFL than in the Ho:YAG group (20.4 vs 14.8 mm; p = 0.01). SF status was similar in both groups (68.4% vs 72%; p = 0.06). Complication rates were comparable. In subgroup analysis, the SF rate was significantly higher (81.6% vs 62.5%; p = 0.04) and the operative time was shorter for stones measuring 1–2 cm, whereas the results were similar for stones 2 cm. The lack of randomization and single-center design are the main limitations of the study. Conclusions: TFL and Ho:YAG lithotripsy are comparable in terms of the SF rate and safety for the treatment of UUT lithiasis. According to our study, for a cumulative stone size of 1–2 cm, TFL is more effective than Ho:YAG. Patient summary: We compared the efficiency and safety of two laser types for the treatment of stones in the upper urinary tract. We found that stone-free status at 3 months did not significantly differ between the holmium and thulium lasers.
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- 2023
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27. A framework for developing technical process reengineering designs
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Aldowaisan, Tariq A. and Gaafar, Lotfi K.
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Manufacturing processes -- Analysis ,Reengineering (Management) -- Analysis - Abstract
Process Reengineering (PR) is one of the most popular work system improvement concepts in industry today. In PR, the basic designs of key organizational processes are reconsidered in light of the tremendous advancements in technology; especially with regard to computer power, software capabilities, and communication. In this paper, PR is presented as a constrained design search problem, where a solution is located using one of two proposed algorithms. The first is an aggregation algorithm which commences the search from the current design of the process, whereas the second is a decomposition algorithm which commences the search from a hypothetical design composed of non-distinct activities. Each algorithm supports a different approach for reconsidering the current process. Aggregation supports orderly elimination of activities from the current process, whereas decomposition supports a novel construction of the reengineered process. Alternative designs are compared using a specially constructed utility function tailored to the objectives of PR. An architecture for a PR decision support system (PRDSS) is presented. PRDSS supports the entire process of generating, evaluating, and selecting the best design using either of the two proposed algorithms. A case example of process reengineering in a public service organization is also included to explain the various concepts presented in the paper.
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- 1997
28. A framework for a process reengineering decision support system
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Aldowaisan, Tariq A. and Gaafar, Lotfi K.
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Decision support systems -- Evaluation ,Reengineering (Management) -- Models ,Search theory -- Usage - Abstract
In this paper, process reengineering (PR) is presented as a constrained design search problem, where a solution is located using one of two alternative search algorithms. The algorithms are used to develop a framework for a PR decision support system (PRDSS). We believe that the result of our work lays the ground for a more orderly and structured definition and development of the PR concept. KEYWORDS Process reengineering; decision support system; search algorithms.
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- 1996
29. Parental substance use disorder and risk of intellectual disability in offspring in Sweden: a national register studyResearch in context
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Lotfi Khemiri, Ralf Kuja-Halkola, Henrik Larsson, Agnieszka Butwicka, Magnus Tideman, Brian M. D'Onofrio, Antti Latvala, and Paul Lichtenstein
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Intellectual disability ,Mental retardation ,Parental substance use disorder ,Parental alcohol use disorder ,Parental drug use disorder ,Medicine (General) ,R5-920 - Abstract
Summary: Background: Intellectual disability (ID) is a disorder with unknown aetiology in many cases. Maternal alcohol use is a known risk factor for ID, but less is known about the importance of maternal and paternal substance use disorder (SUD) and risk of ID in offspring. Methods: Data from multiple nationwide registers were used to create a cohort of children born from January 01, 1978 to December 31, 2002. All participants were born in Sweden, had available parental identification information and did not emigrate or die before age 12 (n = 1,940,820). Logistic regression modelling was performed with exposure defined as having a parent who received any SUD diagnosis, including alcohol use disorder (AUD) and drug use disorder (DUD). The outcome was registration of diagnosis of any form of ID. First, we analysed the risk of ID if parental SUD was registered prior to childbirth with stepwise adjustment of multiple covariates. Second, the effect of timing of SUD diagnosis in relation to childbirth was analysed. Findings: Of 37,410 offspring with parental SUD registered prior to birth, 3.0% (n = 1110) had any form of ID compared to 1.2% (n = 23,168) of those 1,903,410 individuals without parental SUD prior birth. Parental SUD prior birth was associated with an increased risk of any form of ID (Odds Ratio [OR]: 2.3 [2.2–2.5]), with ORs similar for maternal (OR: 2.3 [2.1–2.5]) and paternal SUD (OR: 2.3 [2.1–2.5]). These ORs were reduced but remained statistically significant after adjusting for parental education, migration, psychiatric comorbidity, and co-parent SUD (OR parental SUD: 1.6 [1.5–1.8]; OR maternal SUD: 1.4 [1.2–1.5]; OR paternal SUD: 1.6 [1.5–1.7]). Parental SUD was associated with increased risk of ID in offspring irrespective of timing of diagnosis, but if mothers or fathers were diagnosed with AUD during pregnancy (OR maternal AUD: 5.0 [3.1–8.2]; OR paternal AUD: 2.8 [2.2–3.6]), the risk was significantly greater than if the AUD diagnosis was first registered after childbirth (OR maternal AUD: 1.9 [1.8–2.0]; OR paternal AUD: 1.6 [1.6–1.7]). Interpretation: Both paternal and maternal SUD were associated with an increased risk of ID in offspring, with greatest risk observed when AUD was diagnosed during pregnancy. Possible mechanisms may involve shared genetic and environmental factors, including toxic effects from alcohol intake. These findings have clinical implications in suggesting that parental SUD in either parent represents a possibly modifiable risk factor to consider when developing prevention, diagnostics and treatment programs for children with ID. Funding: Stockholm County Council, the Research Council of the Swedish Alcohol Retailing Monopoly, Fredrik and Ingrid Thurings stiftelse, Academy of Finland, the Swedish Research Council and the Swedish Research Council for Health, Working Life and Welfare, Nordforsk by the Nordic Council of Ministers and the Polish Medical Research Agency.
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- 2023
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30. Business process reengineering: an approach for process mapping
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Aldowaisan, Tariq A. and Gaafar, Lotfi K.
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- 1999
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31. Increased proportion of mature NK cells is associated with successful imatinib discontinuation in chronic myeloid leukemia
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Ilander, M, Olsson-Strömberg, U, Schlums, H, Guilhot, J, Brück, O, Lähteenmäki, H, Kasanen, T, Koskenvesa, P, Söderlund, S, Höglund, M, Markevärn, B, Själander, Anders, Lotfi, K, Dreimane, A, Lübking, A, Holm, E, Björeman, M, Lehmann, S, Stenke, L, Ohm, L, Gedde-Dahl, T, Majeed, W, Ehrencrona, H, Koskela, S, Saussele, S, Mahon, F-X, Porkka, K, Hjorth-Hansen, H, Bryceson, Y T, Richter, J, Mustjoki, S, Ilander, M, Olsson-Strömberg, U, Schlums, H, Guilhot, J, Brück, O, Lähteenmäki, H, Kasanen, T, Koskenvesa, P, Söderlund, S, Höglund, M, Markevärn, B, Själander, Anders, Lotfi, K, Dreimane, A, Lübking, A, Holm, E, Björeman, M, Lehmann, S, Stenke, L, Ohm, L, Gedde-Dahl, T, Majeed, W, Ehrencrona, H, Koskela, S, Saussele, S, Mahon, F-X, Porkka, K, Hjorth-Hansen, H, Bryceson, Y T, Richter, J, and Mustjoki, S
- Abstract
Recent studies suggest that a proportion of chronic myeloid leukemia (CML) patients in deep molecular remission can discontinue the tyrosine kinase inhibitor (TKI) treatment without disease relapse. In this multi-center, prospective clinical trial (EURO-SKI, NCT01596114) we analyzed the function and phenotype of T and NK cells and their relation to successful TKI cessation. Lymphocyte subclasses were measured from 100 imatinib treated patients at baseline and 1 month after the discontinuation, and functional characterization of NK and T cells was done from 45 patients. The proportion of NK cells was associated with the molecular relapse free survival as patients with higher than median NK-cell percentage at the time of drug discontinuation had better probability to stay in remission. Similar association was not found with T or B cells or their subsets. In non-relapsing patients the NK-cell phenotype was mature, whereas patients with more naïve CD56(bright) NK cells had decreased relapse free survival. In addition, the TNF-α/IFN-γ cytokine secretion by NK cells correlated with the successful drug discontinuation. Our results highlight the role of NK cells in sustaining remission and strengthen the status of CML as an immunogenic tumor warranting novel clinical trials with immunomodulating agents.
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- 2017
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32. Advancing toward Personalized and Precise Phosphorus Prescription Models for Soybean (Glycine max (L.) Merr.) through Machine Learning
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Floyd Muyembe Chipatela, Lotfi Khiari, Hamza Jouichat, Ismail Kouera, and Mahmoud Ismail
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optimal field-specific rate ,predicting response curves ,prescription of P ,unified phosphorus fertility classification system ,Agriculture - Abstract
The traditional approach of prescribing phosphate fertilizer solely based on soil test P (STP) has faced criticism from scientists and agriculturists pushing farmers to seek phosphate fertilization models that incorporate additional factors. By embracing integrated approaches, farmers can receive more precise recommendations that align with their specific conditions and fertilization techniques. This study aimed to utilize artificial intelligence prediction to replicate soybean response curves to fertilizer by integrating edaphic and climatic factors. Literature data on soybean response to P fertilization were collected, and the Random Forest (RF) algorithm was applied to predict response curves. The predictions utilized seven predictors: P dose, STP, soil pH, texture, % OM, precipitation, and P application methods. These predictions were compared to the traditional STP-based approach. The STP-based P prescription models exhibited extremely low robustness values (R2) of 1.53% and 0.88% for the PBray-1 and POlsen diagnostic systems, respectively. In contrast, implementing the RF algorithm allowed for more accurate prediction of yield gains at various P doses, achieving robustness values of 87.4% for the training set and 60.9% for the testing set. The prediction errors remained below 10% throughout the analysis. Implementing artificial intelligence modeling enabled the study to achieve precise predictions of the optimal P dose and customized fertilization recommendations tailored to farmers’ specific soil conditions, climate, and individual fertilization practices.
- Published
- 2024
- Full Text
- View/download PDF
33. Calcium Ferrite Nanoparticles: A Simple Synthesis Approach for the Effective Disposal of Congo Red Dye from Aqueous Environments
- Author
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Nada S. Al-Kadhi, Ghadah M. Al-Senani, Faisal K. Algethami, Reem K. Shah, Fawaz A. Saad, Alaa M. Munshi, Khalil ur Rehman, Lotfi Khezami, and Ehab A. Abdelrahman
- Subjects
adsorption ,Congo red dye ,CaFe2O4 nanoparticles ,characterization ,Inorganic chemistry ,QD146-197 - Abstract
Congo red dye is classified as a toxic chemical and can be harmful if ingested, inhaled, or in contact with the skin or eyes. It can cause irritation, allergic reactions, and skin sensitization in some individuals. Thus, in this paper, CaFe2O4 nanoparticles were produced by a simple Pechini sol-gel approach and used as an adsorbent material for the efficient disposal of Congo red dye from aqueous solutions. The maximum adsorption capacity of the CaFe2O4 towards Congo red dye is 318.47 mg/g. Furthermore, the synthesized CaFe2O4 nanoparticles exhibit an average crystal size of 24.34 nm. Scanning electron microscopy (SEM) examination showed that the CaFe2O4 nanoparticles are basically ball-like particles with a mean grain size of 540.54 nm. Moreover, transmission electron microscopy (TEM) examination showed that the CaFe2O4 sample revealed aggregated spherical particles with a mean diameter of 27.48 nm. The Energy-dispersive X-ray spectroscopy (EDS) pattern reveals that the produced CaFe2O4 nanoparticles are composed of Ca, Fe, and O elements, with an atomic ratio of 1:2:4 of these elements, respectively. The disposal of Congo red dye by the synthesized CaFe2O4 nanoparticles is chemical, spontaneous, exothermic, perfectly aligned with the pseudo-second-order kinetic model, and exhibited excellent conformity with the Langmuir equilibrium isotherm.
- Published
- 2024
- Full Text
- View/download PDF
34. Kinetic Modeling of the Photocatalytic Degradation of Chlorinated Aromatic Volatile Organic Compounds: Mass Transfer Enhancement
- Author
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N’Zanon Aly Koné, Amine Aymen Assadi, Nacer Belkessa, Lotfi Khezami, Sandotin Lassina Coulibaly, Youcef Serhane, Walid Elfalleh, Lacina Coulibaly, Abdelkrim Bouzaza, and Abdeltif Amrane
- Subjects
air treatment ,reactor modeling ,mass transfer ,pilot scale ,relative humidity ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Chlorobenzene (CB) and Chloronaphthalene (CN) emissions from cement plant operations pose significant environmental risks. This study investigates the mass transfer effects of chlorinated aromatic Volatile Organic Compounds (VOCs), specifically CB and CN, in the gas phase of a continuous-tangential-flow annular photocatalytic reactor. The experiments involved introducing CB and CN into the reactor, and the degradation kinetics were analyzed using the Langmuir–Hinshelwood (L-H) model. The L-H model was applied to assess the impact of the flow rate, concentration, and relative humidity (% RH) on the degradation rate (DR). The results indicate that both the experimental and simulated degradation rates improved with increased flow rates (1 to 9 m3·h−1) and inlet concentrations (30 to 216 mg·m−3). This enhancement of the DR correlates with the availability of active OH* species on the TiO2 surface. The L-H model emphasizes the role of H2O molecules in VOC removal kinetics. The degradation rates increased with a rising water content (5 to 55%), but adverse effects on VOC conversion were observed beyond a 55% RH. This study reveals a mass transfer effect, with internal diffusional limitations in the TiO2 pores under operational conditions. The kinetics were predominantly controlled by chemical kinetics and catalyst pore availability. Furthermore, this study demonstrates a higher CB degradation than CN in the reactor and experimental conditions. For a concentration of 1.328 mM·m−3, the CB DR ranged from 0.70 to 2.84 µM·m2·s−1, as the flow rate varied from 1 to 9 m3·h−1. The CN DR varied from 0.60 to 2.20 µM·m2·s−1 within the same flow rate range.
- Published
- 2024
- Full Text
- View/download PDF
35. Applying particle swarm optimisation to dynamic lot sizing with batch ordering
- Author
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A. S. Aly and Lotfi K. Gaafar
- Subjects
Mathematical optimization ,Engineering ,Operations research ,Heuristic (computer science) ,business.industry ,Strategy and Management ,Particle swarm optimization ,Time horizon ,Management Science and Operations Research ,Industrial and Manufacturing Engineering ,Sizing ,Genetic algorithm ,Batch processing ,Heuristics ,Batch production ,business - Abstract
This paper investigates the applicability of particle swarm optimisation (PSO) to the dynamic lot sizing problem with batch ordering. Backorders are allowed to account for discrepancies created by the batch ordering constraint. The PSO solution is compared with solutions generated using both a modified Silver-Meal (MSM) heuristic and a genetic algorithm (GA). A 23 factorial experiment is used to compare the various approaches and to examine the influence of three factors on their performance. The investigated factors include the demand pattern, the batch size, and the planning horizon. The comparisons are based on the relative frequency of obtaining the optimum solution and the percentage deviation from the optimum solution. In general, the PSO outperformed both the MSM and the GA by producing the lowest cost solution on almost all experimental runs. The planning horizon is the most significant factor affecting the performance of all heuristics. The MSM is affected by all investigated factors while the PS...
- Published
- 2009
- Full Text
- View/download PDF
36. A particle swarm-based genetic algorithm for scheduling in an agile environment
- Author
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Ashraf O. Nassef, Lotfi K. Gaafar, and Sherif A. Masoud
- Subjects
Engineering ,Mathematical optimization ,Meta-optimization ,General Computer Science ,Job shop scheduling ,business.industry ,Quality control and genetic algorithms ,General Engineering ,Particle swarm optimization ,Genetic algorithm scheduling ,Genetic algorithm ,Multi-swarm optimization ,business ,Metaheuristic - Abstract
In this paper, genetic algorithms are applied to the scheduling of a manufacturing system that is designed to support an assembly-driven differentiation strategy in the context of agile manufacturing. The system consists of a single flexible machine followed by multiple identical assembly stations. The objective of the scheduling problem is to minimize the makespan. A modified version of the genetic algorithm, inspired by the particle swarm optimization approach, is applied to the problem in addition to the general application of genetic algorithms. The objective is to investigate the potential that the particle swarm optimization concepts may have in improving the performance of genetic algorithms when applied to the chosen problem. The performance of these algorithms is compared to existing heuristics in the literature. A 2^3 factorial experiment, replicated twice, is used to compare the performance of the various approaches and identify the significant factors that affect the average percentage deviation from a lower bound. The results show that both versions of genetic algorithms applications outperform the existing heuristics in many instances and provide schedules that are shorter by as much as 15.5% in the cases considered. In addition, the modified application of genetic algorithms outperforms the regular application with shorter schedules by as much as 3.6% in many instances.
- Published
- 2008
- Full Text
- View/download PDF
37. Fixed-quantity dynamic lot sizing using simulated annealing
- Author
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Ashraf O. Nassef, Lotfi K. Gaafar, and Ahmed I. Aly
- Subjects
Mathematical optimization ,Engineering ,Heuristic (computer science) ,business.industry ,Mechanical Engineering ,Time horizon ,Factorial experiment ,Industrial and Manufacturing Engineering ,Sizing ,Computer Science Applications ,Control and Systems Engineering ,Simulated annealing ,Genetic algorithm ,Heuristics ,business ,Software ,Integer (computer science) - Abstract
In this paper, simulated annealing (SA) is applied to the deterministic dynamic lot-sizing problem with batch ordering and backorders. Batch ordering requires orders that are integer multiples of a fixed quantity that is larger than 1. The performance of the developed SA heuristic is compared to that of a genetic algorithm (GA) and a modified silver-meal (MSM) heuristic developed in the literature, based on the frequency of obtaining the optimum solution and the percentage average deviation from the optimum solution. In addition, the effects of three factors on the performance of the SA, GA, and the MSM are investigated in a 23 factorial experiment. The investigated factors are the demand pattern, the batch size, and the length of the planning horizon. Results indicate that the SA heuristic has the best performance, followed by GA, in terms of the frequency of obtaining the optimum solution and the average deviation from the optimum solution. SA is also the most robust of the investigated heuristics as its performance is only affected by the length of the planning horizon.
- Published
- 2008
- Full Text
- View/download PDF
38. Applying genetic algorithms to dynamic lot sizing with batch ordering
- Author
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Lotfi K. Gaafar
- Subjects
Engineering ,Mathematical optimization ,General Computer Science ,business.industry ,Genetic algorithm ,General Engineering ,Fractional factorial design ,business ,Multiple ,Sizing ,Coding (social sciences) - Abstract
In this paper, genetic algorithms are applied to the deterministic time-varying lot sizing problem with batch ordering and backorders. Batch ordering requires orders that are integer multiples of a fixed quantity that is larger than one. The developed genetic algorithm (GA) utilizes a new '012' coding scheme that is designed specifically for the batch ordering policy. The performance of the developed GA is compared to that of a modified Silver-Meal (MSM) heuristic based on the frequency of obtaining the optimum solution and the average percentage deviation from the optimum solution. In addition, the effect of five factors on the performance of the GA and the MSM is investigated in a fractional factorial experiment. Results indicate that the GA outperforms the MSM in both responses, with a more robust performance. Significant factors and interactions are identified and the best conditions for applying each approach are pointed out.
- Published
- 2006
- Full Text
- View/download PDF
39. Effects of Different Levels of Resistant Starch on Growth Performance and Ileum Morphology in Broilers: A Comparison to Fructooligosaccharide and Zinc Bacitracin.
- Author
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Lotfi, K., Mahdavi, A., Jebelli Javan, A., Staji, H., and Darabighane, B.
- Subjects
- *
PECTORALIS muscle , *POULTRY growth , *STARCH , *CONTROL groups , *BACITRACIN , *ILEUM , *ZINC - Abstract
This study was conducted to examine effects of resistant starch compared to fructooligosaccharide (FOS) and zinc bacitracin (ZnB), on performance and ileum morphology in broilers. The experiment groups included a control (basal diet with no additive; CON), four groups receiving different levels of resistant starch type 2 (1, 2, 3, and 4% added to basal diet; RS), a group receiving fructooligosaccharide (0.4% in basal diet; FOS), and a group receiving Zinc bacitracin (50 mg/kg basal diet; ZnB). The findings on the day 35 indicated that the groups that received 2% and 3% RS were not significantly different from the FOS group and the ZnB group in terms of feed intake. The largest body weight and the smallest feed conversion ratio was found in the ZnB group (P<0.05). Body weights in the groups treated with 3% and 4% RS were not significantly different from the FOS group. The 3% and 4% RS groups had a greater villus height (P<0.05) and a smaller crypt depth compared to the FOS group. These results demonstrated that while the ZnB group had a better performance than other groups, it seems that adding 3% and 4% RS resulted in a performance similar to adding FOS. [ABSTRACT FROM AUTHOR]
- Published
- 2019
40. Genetic algorithms and simulated annealing for scheduling in agile manufacturing
- Author
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Lotfi K. Gaafar and Sherif A. Masoud
- Subjects
Mathematical optimization ,Engineering ,Job shop scheduling ,business.industry ,Strategy and Management ,Real-time computing ,Scheduling (production processes) ,Management Science and Operations Research ,Agile manufacturing ,Adaptive simulated annealing ,Upper and lower bounds ,Industrial and Manufacturing Engineering ,Simulated annealing ,Genetic algorithm ,Heuristics ,business - Abstract
In this paper, genetic algorithms and simulated annealing are applied to scheduling in agile manufacturing. The system addressed consists of a single flexible machine followed by multiple identical assembly stations, and the scheduling objective is to minimize the makespan. Both genetic algorithms and simulated annealing are investigated based on random starting solutions and based on starting solutions obtained from existing heuristics in the literature. Overall, four new algorithms are developed and their performance is compared to the existing heuristics. A 23 factorial experiment, replicated twice, is used to compare the performance of the various approaches, and identify the significant factors that affect the frequency of resulting in the best solution and the average percentage deviation from a lower bound. The results show that both genetic algorithms and simulated annealing outperform the existing heuristics in many instances. In addition, simulated annealing outperforms genetic algorithms with a...
- Published
- 2005
- Full Text
- View/download PDF
41. Individual variation in hemostatic alterations caused by tyrosine kinase inhibitors : a way to improve personalized cancer therapy?
- Author
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Deb, S., Sjöström, C., Tharmakulanathan, A., Boknäs, N., Lotfi, K., Ramström, Sofia, Deb, S., Sjöström, C., Tharmakulanathan, A., Boknäs, N., Lotfi, K., and Ramström, Sofia
- Abstract
INTRODUCTION: During the last two decades, Bcr-Abl tyrosine kinase inhibitors (TKIs) have revolutionized the treatment of chronic myelogenous leukemia (CML), and are now considered standard treatment for this disease. However, TKIs can induce serious hemostatic side effects including cardiovascular disease and bleeding disorders. Blood platelet aggregation and formation of pro-coagulant platelets are important to allow a well-balanced hemostatic response. Therefore, a detailed understanding of what effect different TKIs exert on platelets and hemostasis could help to understand if there are differences of importance to minimize the risk of bleeding complications in treated patients. AIM: To investigate how TKIs used in CML (imatinib, dasatinib, nilotinib, bosutinib, and ponatinib) affect platelet activation and hemostasis. MATERIALS AND METHODS: We have developed a multi-parameter six color flow cytometry protocol to study different aspects of platelet function upon activation, e.g. formation of aggregatory (PAC-1-positive) and pro-coagulant (phosphatidylserine-exposing) platelets, exocytosis of alpha- and lysosomal granules and mitochondrial membrane potential.This protocol was performed in presence or absence of TKIs in blood from normal donors and in treated patients. Whole blood aggregometry (Multiplate®), thrombin generation in platelet-rich plasma and in vitro thrombus formation by free oscillation rheometry (ReoRox G2) was further evaluated in some situations. RESULTS: At clinically relevant concentrations, dasatinib significantly decreased the formation of procoagulant platelets. Ponatinib induced a slight decrease in formation of procoagulant platelets, whereas bosutinib and nilotinib showed opposite tendencies (n=7). Dasatinib also decreased platelet aggregation (n=4-6) and in vitro thrombus formation (n=3). Thrombin generation was not significantly affected by therapeutic levels of TKIs, whereas higher doses of dasatinib, bosutinib, ponatinib and imatinib
- Published
- 2016
- Full Text
- View/download PDF
42. Too Salty or Toxic for Use: A Tale of Starter Fertilizers in Agronomic Cropping Systems
- Author
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William Makaza and Lotfi Khiari
- Subjects
agronomic crops ,ammonia toxicity ,salt injury ,starter fertilizers ,sustainable food systems ,Agriculture - Abstract
The rising shortage of fertilizer resources in crop-producing regions worldwide and the need for fertilizer use optimization to minimize the impact of salt injuries and ammonia toxicity are at the centre of a brewing storm call for sustainable fertilizer savings. The allocation of fertilizers will be an ever-increasing pressure source because of vast agricultural demands under changing climatic conditions. Therefore, starter fertilizers must complement their efficiency and aim to boost productivity and improve food quality to reduce its toxicities, and these observations are corroborated by an analysis of past and ongoing short-, medium-, and long-term experiments. Concurrently, to counterbalance nutrient uptake, fertilizing products containing select nutrients are commonly placed through soil–seed or soil–fertilizer–seed systems to enhance crop production and productivity. Knowledge of the importance of starter fertilizers and their implications as influenced by frequent environmental conditions and management practices remains essential for sustainable and socio-economics of human livelihoods and successful global agronomic food systems under climate change. Therefore, this review takes a closer look at the detailed starter fertilizers’ (N, P, and K) placement approaches exploring their implications on crop production cycles and integrating them with environmental and agronomic management practices that could help to tailor the appropriate fertilizer recommendations and minimise fertilizer toxicity. We explored the mechanisms by which fertilizer salt injury and ammonia toxicity interfere with the morpho-physiological and biochemical processes in most agronomic seed crops. Beyond this, we show the advances that have already been made, as well as suggestions and recommendations concerning managing fertilizer salt injuries and ammonia toxicity potentials in the agricultural industry.
- Published
- 2023
- Full Text
- View/download PDF
43. A neural network model for solving the lot-sizing problem
- Author
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Lotfi K. Gaafar and M.Hisham Choueiki
- Subjects
Information Systems and Management ,Material requirements planning ,Artificial neural network ,business.industry ,Computer science ,Strategy and Management ,Design of experiments ,Scheduling (production processes) ,Artificial neural network model ,Management Science and Operations Research ,Demand forecasting ,Sizing ,Artificial intelligence ,business ,Heuristics - Abstract
Artificial neural network models have been used successfully to solve demand forecasting and production scheduling problems; the two steps that typically precede and succeed Material Requirements Planning (MRP). In this paper, a neural network model is applied to the MRP problem of lot-sizing. The model’s performance is evaluated under different scenarios and is compared to common heuristics that address the same problem. Results show that the developed artificial neural network model is capable of solving the lot-sizing problem with notable consistency and reasonable accuracy.
- Published
- 2000
- Full Text
- View/download PDF
44. Maintaining the validity of simulation models using prediction intervals
- Author
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Lotfi K. Gaafar
- Subjects
Engineering ,Guard (information security) ,General Computer Science ,Scope (project management) ,business.industry ,media_common.quotation_subject ,Simulation modeling ,General Engineering ,Flexible manufacturing system ,Prediction interval ,Observable ,business ,Function (engineering) ,Simulation ,media_common - Abstract
This paper presents a methodology for maintaining the operational validity of simulation models of observable systems in order to support operational decisions. In this methodology, real-time system data are continuously compared against simultaneous prediction intervals on selected responses constructed using the simulation model. The methodology is illustrated through using a case example of a simulation model of a flexible manufacturing system. Different invalidating discrepancies between the model and the system are investigated. Results indicate that using nontraditional responses may lead to a faster detection of invalidating changes, the speed of detection is a function of the scope of the change, and the model may evolve with the system and continue to be used to guard against random changes.
- Published
- 1999
- Full Text
- View/download PDF
45. Business process reengineering: an approach for process mapping
- Author
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Tariq Aldowaisan and Lotfi K. Gaafar
- Subjects
Information Systems and Management ,Process management ,Process modeling ,business.industry ,Business process ,Computer science ,Artifact-centric business process model ,Strategy and Management ,Business process reengineering ,Management Science and Operations Research ,Business process modeling ,Business process management ,Business process discovery ,Business Process Model and Notation ,business - Abstract
The goal of business process reengineering (BPR) is to achieve dramatic improvements in business measures of performance by radically changing the process design. This paper provides a structural definition of the redesign search space using the number of employee types and the number of activities. A systematic approach that combines some linear programming tools with unique BPR principles is then proposed to support the technical redesign of the current process. The approach is illustrated using a public firm process.
- Published
- 1999
- Full Text
- View/download PDF
46. Increased proportion of mature NK cells is associated with successful imatinib discontinuation in chronic myeloid leukemia
- Author
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Ilander, M, primary, Olsson-Strömberg, U, additional, Schlums, H, additional, Guilhot, J, additional, Brück, O, additional, Lähteenmäki, H, additional, Kasanen, T, additional, Koskenvesa, P, additional, Söderlund, S, additional, Höglund, M, additional, Markevärn, B, additional, Själander, A, additional, Lotfi, K, additional, Dreimane, A, additional, Lübking, A, additional, Holm, E, additional, Björeman, M, additional, Lehmann, S, additional, Stenke, L, additional, Ohm, L, additional, Gedde-Dahl, T, additional, Majeed, W, additional, Ehrencrona, H, additional, Koskela, S, additional, Saussele, S, additional, Mahon, F-X, additional, Porkka, K, additional, Hjorth-Hansen, H, additional, Bryceson, Y T, additional, Richter, J, additional, and Mustjoki, S, additional
- Published
- 2016
- Full Text
- View/download PDF
47. Self-rated impulsivity in healthy individuals, substance use disorder and ADHD: psychometric properties of the Swedish Barratt impulsiveness scale
- Author
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Lotfi Khemiri, Christoffer Brynte, Maija Konstenius, Joar Guterstam, Ingvar Rosendahl, Johan Franck, and Nitya Jayaram-Lindström
- Subjects
BIS ,Barratt impulsiveness scale ,Impulsivity ,Motor impulsivity ,Non-planning impulsivity ,Attentional impulsivity ,Psychiatry ,RC435-571 - Abstract
Abstract Background Impulsivity is associated with several psychiatric disorders, including substance use disorders (SUD) and attention deficit hyperactivity disorder (ADHD). A widely used questionnaire to assess impulsivity is the Barratt Impulsiveness Scale (BIS), and the aim of the current study was to evaluate the psychometric properties of the Swedish version of the BIS (swe-BIS). Methods The original BIS was translated to Swedish and back-translated by an authorized translator. The swe-BIS was administered to healthy controls (n = 113), patients with alcohol use disorder (n = 97), amphetamine use disorder (n = 37) and attention deficit hyperactive disorder (ADHD; n = 26). A subset of subjects (n = 62) completed the swe-BIS twice within 1 week. Psychometric evaluation of the swe-BIS included assessment of different indices of reliability (internal consistency, test-retest and agreement) and validity (response processess, divergent and convergent). Confirmatory factor analyses (CFA) were performed to assess several indices of model fit in five different models based on previously suggested subscales. Results Cronbach’s alpha for all swe-BIS items in the full sample was 0.89, ranging from 0.78–0.87 within the different subgroups. The Pearson test-retest correlation for total score was 0.78 (p
- Published
- 2021
- Full Text
- View/download PDF
48. COGNITIVE DYSFUNCTION IN MULTIPLE SCLEROSIS: INFLUENCE OF CLINICAL VARIABLES
- Author
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J. Lotfi K. Alikhani
- Subjects
lcsh:R5-920 ,cognitive dysfunction ,neuropsychological performance ,lcsh:Medicine (General) - Abstract
In this unprecedented study in Iran, 30 ambulatory cases of multiple sclerosis (MS), and 30 demographicallv matched normal control (NC) cases were evaluated by a brief cognitive screening test. Beck's Depression Inventory (BDI), and the Mini- Mental State Examination (MMSE). Mean scores of the BDl were significantly different in the MS and NC groups, while the mean MMSE scores were not. At least 11 patients were considered cognitivelv impaired. These cases were older at the. time of testing and of symptom onset. Cognitive dysfunction was significantly more common in patients with secondan progressive course compared to the. cases with remitting - relapsing course. Mean Expanded Disability Status Scale score was higher in the cognitivelv impaired cases. No significant difference was observed in the mean BDl scores of the cognitivelv intact and impaired cases. This studv provides an estimate of the frequency of cognitive dysfunction in ambulatory cases "f MS. and suggests a correlation between much deficits and age sympton onset, disease course, and piiysica! disability but not depression.
- Published
- 1998
49. A Simulation-Based Shop Floor Monitoring and Decision Support System
- Author
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Javeed Shaik and Lotfi K. Gaafar
- Subjects
Decision support system ,Computational Theory and Mathematics ,Artificial Intelligence ,Computer science ,Industrial engineering ,Simulation based ,Software ,Theoretical Computer Science - Published
- 1997
- Full Text
- View/download PDF
50. A framework for a process reengineering decision support system
- Author
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Tariq A. Aldowaison and Lotfi K. Gaafar
- Subjects
Decision support system ,Engineering ,Development (topology) ,General Computer Science ,Work (electrical) ,business.industry ,Search algorithm ,General Engineering ,Systems engineering ,Search problem ,Business process reengineering ,Software engineering ,business - Abstract
In this paper, process reengineering (PR) is presented as a constrained design search problem, where a solution is located using one of two alternative search algorithms. The algorithms are used to develop a framework for a PR decision support system (PRDSS). We believe that the result of our work lays the ground for a more orderly and structured definition and development of the PR concept.
- Published
- 1996
- Full Text
- View/download PDF
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