22 results on '"Neves, Pedro Miguel"'
Search Results
2. Body composition changes in patients with head and neck cancer under active treatment: a scoping review
- Author
-
Ferrão, Bárbara, Neves, Pedro Miguel, Santos, Teresa, Capelas, Manuel Luís, Mäkitie, Antti, and Ravasco, Paula
- Published
- 2020
- Full Text
- View/download PDF
3. Reconstrução 3D na criação de experiências de realidade aumentada pervasivas
- Author
-
Neves, Pedro Miguel Oliveira, Santos, Maria Beatriz Alves de Sousa, and Dias, Paulo Miguel de Jesus
- Subjects
Virtual object manipulation ,Authoring ,Augmented reality ,3D reconstruction ,Pervasive augmented reality ,Virtual reality - Abstract
Nowadays, additional information can be required to aid with certain tasks as well as to enhance educational and entertainment experiences. A possible solution to support these activities is the use of Augmented Reality (AR), allowing an easier access and a better perception of additional layers of content superimposed onto reality. In this context, Pervasive AR experiences can be used to enrich the real world with virtual content that is visualized continuously as the user moves through the space. However, the creation of such experiences depends on authoring tools that overcome the existing difficulties and facilitate this task. These must be accessible for inexperienced users while also providing experts the full potential of the technology. In this dissertation, two applications were developed: desktop and mobile, both capable of being used for the creation, configuration and visualization of pervasive AR experiences. The system developed makes use of a scan of a physical environment to provide a digital reconstructed representation of that space to the desktop platform and to enable the positional tracking in the mobile platform. While the desktop application presents the user with a non-immersive Virtual Reality (VR) setting and the mobile application provides continuous AR in the physical environment, both scenarios can be used to place virtual content on and ultimately configure an AR experience. The authoring capabilities of both platforms were compared by conducting a user study focused on evaluating their usability. As a result, the positive feedback of the participants shows that these platforms appear to be a valid solution to pursue the goal of having pervasive experiences in large environments, which users can explore, interact with and learn from. Hoje em dia, pode ser necessária informação adicional para auxiliar certas tarefas, assim como para melhorar experiências educativas ou de entretenimento. Uma possível solução no suporte destas actividades é o uso de Realidade Aumentada (RA), possibilitando um acesso facilitado e uma melhor percepção de camadas adicionais de conteúdo sobreposto na realidade. Neste contexto, experiências de RA pervasivas podem ser usadas para enriquecer o mundo real com conteúdo virtual que é visualizado continuamente conforme o utilizador se move pelo espaço. No entanto, a criação de tais experiências depende de ferramentas de configuração que superem as dificuldades existentes e facilitem esta tarefa. Estas devem ser acessíveis para utilizadores inexperientes e, ao mesmo tempo, disponibilizar aos experientes todo o potencial da tecnologia. No âmbito desta dissertação, foram desenvolvidas duas aplicações: desktop e mobile, ambas capazes de serem usadas para a criação, configuração e visualização de experiências de RA pervasivas. O sistema desenvolvido faz uso de uma digitalização de um ambiente físico para fornecer uma representação digital reconstruída desse espaço à plataforma desktop e para permitir a localização na plataforma mobile. Enquanto a aplicação desktop apresenta ao utilizador um cenário de Realidade Virtual (RV) não imersivo e a aplicação mobile providencia RA contínua no ambiente físico, ambos os cenários podem ser usados para se colocar conteúdo virtual e por fim configurar uma experiência de RA. As capacidades de configuração de ambas as plataformas foram comparadas conduzindo um estudo focado em avaliar a sua usabilidade. Como resultado, os pareceres positivos dos participantes mostram que estas plataformas evidenciam ser uma solução válida para atingir o objectivo de conseguir experiências pervasivas em grandes ambientes, nos quais os utilizadores podem explorar, interagir e aprender. Mestrado em Engenharia de Computadores e Telemática
- Published
- 2021
4. Evaluation of two integrated signalling schemes for the Ultra Flat Architecture using SIP, IEEE 802.21, and HIP/PMIP protocols
- Author
-
Faigl, Zoltán, Bokor, László, Neves, Pedro Miguel, Daoud, Khadija, and Herbelin, Philippe
- Published
- 2011
- Full Text
- View/download PDF
5. Protein intake and muscle mass maintenance in patients with cancer types with high prevalence of sarcopenia: a systematic review
- Author
-
Capitão, Carolina, Coutinho, Diana, Neves, Pedro Miguel, Capelas, Manuel Luís, Pimenta, Nuno, Santos, Teresa, Mäkitie, Antti, Ravasco, Paula, and Repositório da Universidade de Lisboa
- Subjects
Protein intake ,Body composition ,Muscle wasting ,Cancer ,Nutrition - Abstract
© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021, Rationale: Cancer is associated with muscle wasting. However, optimal protein intake has not been determined, limiting the efficacy of nutritional interventions. This systematic review aims to assess the effect of protein intake on muscle mass of patients with cancer types with high prevalence of sarcopenia during treatment, in longitudinal studies. Methods: MEDLINE, CINAHL, and Scopus databases were searched following PRISMA guidelines. Longitudinal studies written in English, including adults with high sarcopenia prevalence cancer diagnosis, submitted to (chemo)radiotherapy, with assessment of protein intake and muscle changes during treatment, published until 4 October 2020 were included. Studies including supplementation with substances, such as n-3 fatty acids, specific amino acids, or proteins, were excluded. Study appraisal was independently conducted by two reviewers, and a qualitative research synthesis was performed. Results: Overall, 575 records were identified, of which, eight studies were included (one randomized clinical trial and seven uncontrolled before and after studies). Patients with head and neck (n = 5), lung (n = 2), and esophageal cancer (n = 1) were included, comprising a total of 554 participants. The studies presented heterogeneous methodologies, objectives, and methods to assess body composition. Overall, participant groups with a mean protein intake below 1.2 g/kg presented muscle wasting, with one exception, while those reporting a mean intake above 1.4 g/kg, maintained muscle during treatment. Conclusions: Our findings show that protein intakes below 1.2 g/kg, even when within the recommendations, have been associated with muscle wasting during treatment. Only intakes above 1.4 g/kg have been associated with muscle maintenance. High-quality research is needed to establish an optimal dose response.
- Published
- 2021
6. N-3 Fatty Acids Supplementation And Chemotherapy Induced Toxicity: Scoping Review
- Author
-
Mateus, Carlota, Branco, Mariana Garcia, Neves, Pedro Miguel, Santos, Teresa, Capelas, Manuel Luís, Makitie, Antti, Ravasco, Paula, Mateus, C., Branco, M., Neves, P.M., Branco, T., Capelas, M.L., Makitie, A., and Ravasco, P.
- Published
- 2023
- Full Text
- View/download PDF
7. Managing Severe Dysgeusia and Dysosmia in Lung Cancer Patients: A Systematic Scoping Review.
- Author
-
Spencer, Ana Sofia, da Silva Dias, David, Capelas, Manuel Luís, Pimentel, Francisco, Santos, Teresa, Neves, Pedro Miguel, Mäkitie, Antti, and Ravasco, Paula
- Subjects
MUCOSITIS ,LUNG cancer ,TASTE disorders ,SMELL disorders ,CANCER patients ,NUTRITION counseling - Abstract
Introduction: Lung cancer (LC) is highly prevalent worldwide, with elevated mortality. In this population, taste and smell alterations (TSAs) are frequent but overlooked symptoms. The absence of effective therapeutic strategies and evidence-based guidelines constrain TSAs' early recognition, prevention and treatment (Tx), promoting cancer-related malnutrition and jeopardizing survival outcomes and quality of life. Objectives: To systematically review the literature on TSAs in LC patients, understand the physiopathology, identify potential preventive and Tx strategies and to further encourage research in this area. Methods: Literature search on English language articles indexed to PubMed, CINALH, SCOPUS and Web of Science using MeSH terms "Lung neoplasms","Dysgeusia", "Olfaction Disorders", "Carcinoma, Small Cell","Carcinoma, Non- Small-Cell Lung "Adenocarcinoma of Lung","Carcinoma, Large Cell", and non-MeSH terms "Parageusia", "Altered Taste", "Smell Disorder", "Paraosmia", "Dysosmia","Lung Cancer" and "Oat Cell Carcinoma". Results: Thirty-four articles were reviewed. TSAs may follow the diagnosis of LC or develop during cancer Tx. The estimated prevalence of self-reported dysgeusia is 35-38% in treatment-naïve LC patients, and 35-69% in those undergoing Tx, based on studies involving LC patients only. One prospective pilot trial and 1 RCT demonstrated a clinically significant benefit in combining flavor enhancement, smell and taste training and individualized nutritional counselling; a systematic review, 1 RCT and 1 retrospective study favored using intravenous or oral zinc-based solutions (150mg 2-3 times a day) for the prevention and Tx of chemotherapy (CT) and radiotherapy (RT) -induced mucositis and subsequent dysgeusia. Conclusions: This is the first review on dysgeusia and dysosmia in LC patients to our knowledge. We propose combining taste and smell training, personalized dietary counselling and flavor enhancement with oral zinc-based solutions (150mg, 2-3 times a day) during CT and/or RT in this population, in order to prevent and help ameliorate Tx-induced dysgeusia and mucositis. However due to study heterogeneity, the results should be interpreted with caution. Developing standardized TSA measurement tools and performing prospective randomized controlled trials to evaluate their effect are warranted. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
8. Acute paraparesis in adult male
- Author
-
Lopes Das Neves, Pedro Miguel
- Subjects
Haemorrhage ,MR ,Imaging sequences ,Neuroradiology spine ,MR-Diffusion/Perfusion - Abstract
Clinical History Image Findings Discussion Find Diagnosis Differential Diagnosis, male, 74 years, Clinical History: Patient presented with intense back pain aggravating in the past 3 days and compromising gait. After performing CT imaging, and considering the recent medical history of infectious spondylodiscitis, a recurrence of the infectious process was assumed and a... Final Diagnosis: Spontaneous spinal epidural hematoma
- Published
- 2018
- Full Text
- View/download PDF
9. Body Composition Evaluation in Head and Neck Cancer Patients: A Review.
- Author
-
Almada-Correia, Inês, Neves, Pedro Miguel, Mäkitie, Antti, and Ravasco, Paula
- Subjects
BODY composition ,DUAL-energy X-ray absorptiometry ,BIOELECTRIC impedance ,MUSCLE mass ,CANCER patients ,HEAD & neck cancer - Abstract
Introduction: Head and neck cancer (HNC) patients show a high risk of malnutrition due to the lifestyle habits adopted prior to the diagnosis as well as to the compromising impact of both the anatomical location of the tumor and the treatment modalities on food intake. Weight change, measurement of skinfold thickness, biochemical parameters, bioelectrical impedance analysis (BIA), computed tomography (CT), magnetic resonance (MRI), or dual-energy x-ray absorptiometry (DXA) are available techniques to evaluate nutritional status and/or body composition in the clinical practice. Evaluating body composition alterations in HNC patients is essential to be able to offer the best therapeutical interventions. In this paper, we review the existing literature regarding body composition evaluation in HNC patients to determine, which is the most suitable method for this population, regarding availability in the day-to-day practice, patient burden, cost, sensibility, and specificity. Methodology: A literature search for relevant papers indexed in MEDLINE, Cochrane Library and Scielo was conducted, with no publication date restriction and for all published articles until the 31 January, 2019. All the papers written in English, with interventions in humans, exclusively considering HNC patients were selected. Results: A total of 41 studies with different methodologies were included in this review. In 15 studies BIA was the used assessment method and three of them also evaluated skinfold thickness and one was a bioelectric impedance vector analysis (BIVA). Body composition assessment was made with DXA in eight studies, one of which also included muscle biopsies. In two studies the chosen method was both BIA and DXA. CT/ positron emission tomography-CT was applied in 11 studies and one also included MRI. In two studies body composition was assessed with skinfold measurements alone and one study only used BIVA. Conclusions: Despite the different existing body composition assessment tools, it seems that skeletal muscle mass (SMM) measurement at the level of cervical spine C3 vertebra may be a reliable method for SMM assessment as it strongly correlates with cross-sectional area measures at the level of L3 and it allows a cost-effective body composition assessment without the need for additional radiation exposure. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
10. Challenges to Support Edge-as-a-Service
- Author
-
Davy, Steven Famaey, Jeroen Serrat, Joan Luis Gorricho, Juan and Miron, Avi Dramitinos, Manos Neves, Pedro Miguel Latre, Steven Goshen, Ezer
- Abstract
A new era in telecommunications is emerging. Virtualized networking functions and resources will offer network operators a way to shift the balance of expenditure from capital to operational, opening up networks to new and innovative services. This article introduces the concept of edge as a service (EaaS), a means of harnessing the flexibility of virtualized network functions and resources to enable network operators to break the tightly coupled relationship they have with their infrastructure and enable more effective ways of generating revenue. To achieve this vision, we envisage a virtualized service access interface that can be used to programmatically alter access network functions and resources available to service providers in an elastic fashion. EaaS has many technically and economically difficult challenges that must be addressed before it can become a reality; the main challenges are summarized in this article.
- Published
- 2014
11. Acesso banda larga sem fios em ambientes heterogéneos de próxima geração
- Author
-
Neves, Pedro Miguel Naia, Sargento, Susana, and Fontes, Francisco Manuel Marques
- Subjects
Internet ,Redes de banda larga ,Engenharia informática ,Redes sem fios - Abstract
Doutoramento em Engenharia Informática O acesso ubíquo à Internet é um dos principais desafios para os operadores de telecomunicações na próxima década. O número de utilizadores da Internet está a crescer exponencialmente e o paradigma de acesso "always connected, anytime, anywhere" é um requisito fundamental para as redes móveis de próxima geração. A tecnologia WiMAX, juntamente com o LTE, foi recentemente reconhecida pelo ITU como uma das tecnologias de acesso compatíveis com os requisitos do 4G. Ainda assim, esta tecnologia de acesso não está completamente preparada para ambientes de próxima geração, principalmente devido à falta de mecanismos de cross-layer para integração de QoS e mobilidade. Adicionalmente, para além das tecnologias WiMAX e LTE, as tecnologias de acesso rádio UMTS/HSPA e Wi-Fi continuarão a ter um impacto significativo nas comunicações móveis durante os próximos anos. Deste modo, é fundamental garantir a coexistência das várias tecnologias de acesso rádio em termos de QoS e mobilidade, permitindo assim a entrega de serviços multimédia de tempo real em redes móveis. Para garantir a entrega de serviços multimédia a utilizadores WiMAX, esta Tese propõe um gestor cross-layer WiMAX integrado com uma arquitectura de QoS fim-a-fim. A arquitectura apresentada permite o controlo de QoS e a comunicação bidireccional entre o sistema WiMAX e as entidades das camadas superiores. Para além disso, o gestor de cross-layer proposto é estendido com eventos e comandos genéricos e independentes da tecnologia para optimizar os procedimentos de mobilidade em ambientes WiMAX. Foram realizados testes para avaliar o desempenho dos procedimentos de QoS e mobilidade da arquitectura WiMAX definida, demonstrando que esta é perfeitamente capaz de entregar serviços de tempo real sem introduzir custos excessivos na rede. No seguimento das extensões de QoS e mobilidade apresentadas para a tecnologia WiMAX, o âmbito desta Tese foi alargado para ambientes de acesso sem-fios heterogéneos. Neste sentido, é proposta uma arquitectura de mobilidade transparente com suporte de QoS para redes de acesso multitecnologia. A arquitectura apresentada integra uma versão estendida do IEEE 802.21 com suporte de QoS, bem como um gestor de mobilidade avançado integrado com os protocolos de gestão de mobilidade do nível IP. Finalmente, para completar o trabalho desenvolvido no âmbito desta Tese, é proposta uma extensão aos procedimentos de decisão de mobilidade em ambientes heterogéneos para incorporar a informação de contexto da rede e do terminal. Para validar e avaliar as optimizações propostas, foram desenvolvidos testes de desempenho num demonstrador inter-tecnologia, composta pelas redes de acesso WiMAX, Wi-Fi e UMTS/HSPA. Ubiquitous Internet access is one of the main challenges for the telecommunications industry in the next decade. The number of users accessing the Internet is growing exponentially and the network access paradigm of “always connected, anytime, anywhere” is a central requirement for the so-called Next Generation Mobile Networks (NGMN). WiMAX, together with LTE, was recently recognized by ITU as one of the compliant access technologies for 4G. Nevertheless, WiMAX is not yet fully prepared for next generation environments, mainly due to the lack of QoS and mobility crosslayer procedures to support real-time multimedia services delivery. Furthermore, besides the 4G compliant WiMAX and LTE radio access technologies, UMTS/HSPA and Wi-Fi will also have a significant impact in the mobile communications during the next years. Therefore, it is fundamental to ensure the coexistence of multiple radio access technologies in what QoS and mobility procedures are concerned, thereby allowing the delivery of real-time services in mobile networks. In order to provide the WiMAX mobile users with the demanded multimedia services, it is proposed in this Thesis a WiMAX cross-layer manager integrated in an end-to-end all-IP QoS enabled architecture. The presented framework enables the QoS control and bidirectional communication between WiMAX and the upper layer network entities. Furthermore, the proposed cross-layer framework is extended with media independent events and commands to optimize the mobility procedures in WiMAX environments. Tests were made to evaluate the QoS and mobility performance of the defined architecture, demonstrating that it is perfectly capable of handling and supporting real time services without introducing an excessive cost in the network. Following the QoS and mobility extensions provided for WiMAX, the scope of this Thesis is broaden and a seamless mobility architecture with QoS support in heterogeneous wireless access environments is proposed. The presented architecture integrates an extended version of the IEEE 802.21 framework with QoS support, as well as an advanced mobility manager integrated with the IP level mobility management protocols. Finally, to complete the work within the framework of this Thesis, it is proposed an extension to the handover decisionmaking processes in heterogeneous access environments through the integration of context information from both the network entities and the enduser. Performance tests were developed in a real testbed to validate the proposed optimizations in an inter-technology handover scenario involving WiMAX, Wi-Fi and UMTS/HSPA.
- Published
- 2012
12. Collaborative environment to support a professional community
- Author
-
Neves, Pedro Miguel Salsinha and Oliveira, José
- Abstract
Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Engenharia Electrotécnica e de Computadores Recent manufacturing roadmaps stress current production systems limitations, emphasizing social, economic and ecologic consequences for Europe of a non-evolution to sustainable Production Systems. Hence, both academic institutions and enterprises are committed to develop solutions that would endow enterprises to survive in nowadays’ extremely competitive business environment. A research effort is being carried on by the Evolvable Production Systems consortium towards attaining Production Systems that can cope with current technological, economical, ecological and social demands fulfilling recent roadmaps. Nevertheless research success depends on attaining consensus in the scientific community and therefore an accurate critical mass support is required in the whole process. The main goal of this thesis is the development of a Collaborative Environment Tool to assist Evolvable Production Systems consortium in such research efforts and to enhance Evolvable Assembly Systems paradigm dissemination. This work resulted in EASET (Evolvable Assembly Systems Environment Tool), a collaborative environment tool which promotes EAS dissemination and brings forth improvements through the raise of critical mass and collaboration between entities.
- Published
- 2009
13. SLA management and service composition of virtualized applications in mobile networking environments.
- Author
-
Landi, Giada, Neves, Pedro Miguel, Edmonds, Andy, Metsch, Thijs, Mueller, Julius, and Crosta, Paolo Secondo
- Published
- 2014
- Full Text
- View/download PDF
14. WEIRD testbeds with fixed and mobile WiMAX technology for user applications, telemedicine and monitoring of impervious areas.
- Author
-
Mignanti, Silvano, Castellano, Mario, Spada, Mariarita, Simoes, Paulo, Tamea, Gabriele, Cimmino, Antonio, Neves, Pedro Miguel, Marchetti, Ilaria, Andreotti, Fausto, Landi, Giada, and Pentikousis, Kostas
- Published
- 2008
15. Killing me softly - a collection of studies exploring moderated mediation effects on the relationship between supervisor incivility and emotional exhaustion: the roles of techno-invasion and loneliness
- Author
-
Köstler, Vincenzo Hieronymus and Neves, Pedro Miguel Miranda
- Subjects
Leadership ,Loneliness ,Well-being ,Emotional exhaustion ,Burnout ,Covid-19 ,Techno-invasion ,Ciências Sociais::Economia e Gestão [Domínio/Área Científica] ,Supervisor incivility - Published
- 2022
16. Killing me softly - a collection of studies exploring moderated mediation effects on the relationship between supervisor incivility and emotional exhaustion: the roles of negative affect and core self-evaluations
- Author
-
Alimoradian, Jasmin and Neves, Pedro Miguel Miranda
- Subjects
Leadership ,Core self-evaluations ,Emotional exhaustion ,Burnout ,Negative affect ,Covid-19 ,Ciências Sociais::Economia e Gestão [Domínio/Área Científica] ,Supervisor incivility - Abstract
Across three independent studies we examined the mechanisms and boundary conditions of the relationship between supervisor incivility and emotional exhaustion. The current study examined the moderating role of core self-evaluations on the supervisor incivility-emotional exhaustion relationship via negative affect. Data were collected from 128, mainly German, employees. Results showed that the moderation effect was significant for people with low levels of core self-evaluations. Thus, a high level of core self-evaluations provides a buffer, but not complete protection against emotional exhaustion. Therefore, companies should ensure a respectful environment, offer personality development opportunities, and prevent misconduct by supervisors.
- Published
- 2022
17. Killing me softly - a collection of studies exploring moderated mediation effects on the relationship between supervisor incivility and emotional exhaustion: the roles of rumination and gender
- Author
-
Bierl, Lena Ilona and Neves, Pedro Miguel Miranda
- Subjects
Leadership ,Rumination ,Emotional exhaustion ,Burnout ,Gender ,Covid-19 ,Ciências Sociais::Economia e Gestão [Domínio/Área Científica] ,Supervisor incivility - Abstract
Across three independent studies, we explored mediators and moderators for the relationship between supervisor incivility and emotional exhaustion. The current study investigated the moderating effect of gender on the supervisor incivility-emotional exhaustion relationship via rumination. Through an online survey, data was collected from 143 employees, mainly recruited in Germany. Results showed that the effect of rumination on the relationship between supervisor incivility and emotional exhaustion was significant for men, but not for women. Consequently, it is important for companies to deploy zero-tolerance policies for workplace incivility but also equip employees with protective mechanisms to reduce ruminative thoughts.
- Published
- 2022
18. Gestão de desempenho em ambientes de rede virtualizados (NFV) e programáveis (SDN)
- Author
-
Pedro, Rui Filipe, Sargento, Susana, and Neves, Pedro Miguel Naia
- Subjects
SDN ,NFV ,Aggregation ,Redes de telecomunicações ,Monitoring ,Virtualization ,Sistemas de comunicação móveis ,SON ,Gestão de redes ,5G - Abstract
Mestrado em Engenharia de Computadores e Telemática More than tendencies and exploratory knowledge domains, there is a strong conviction in the industry that network function virtualization (NFV) and software-de ned network (SDN) paradigms came here to stay in the telecommunication services world. So that operators can surf the waves of change, they will have to signi cantly change their network architecture, their management mechanisms, and, simultaneously , their business model. This Master Thesis intends to contribute to the operators operation management mechanisms evolution, namely in the supervision/monitoring domains. More concretely, the work to be developed in this Master Thesis, will have as its main objective the evolution of the performance management platform (Altaia) from Altice Labs to the new networking paradigm based on the NFV and SDN concepts. It is also important to outline that the activities to be developed in the scope of this work, will be aligned in an international R&D project, nanced by the European Commission, covered by the H2020 5G-PPP program, that is SELFNET (A Framework for Self-Organized Network Management in Virtualized and Software De ned Networks). Altice Labs is one the participants in the SELFNET consortium, together with 10 more international partners. The project was a vast scope and intends to address Self-Organizing Network (SON) scenarios, and prediction over potential network and services prediction. It is in this context that the evolved version of Altaia will be introduced to the SELFNET project. This thesis proposes to develop the necessary tools to model, persist and perform real-time processing over network infrastructure data. More speci cally, this thesis developed: rstly the Raw and Aggregation Data Model, that uni ed both raw and aggregated data under a single model, secondly the Raw Data Loader, a component that receives network sensed data and transforms it so it can be persisted, lastly the Complex Event Processing Framework, a real-time processing framework for processing data using a dynamic rule-based approach. Out of what it was proposed no objective was left behind, all components were successful developed. The Raw and Aggregation Data Model, together with the Raw Data Loader, enforced SELFNET sensors to follow this model, thus unifying all sensed data under a known model. Moreover, the Complex Event Processing Framework was put into to place, with aggregation rules relative to the SELFNET Self- Protection use case, and is able to provide, in real-time, information about detected botnets around the underlying network. From the development of this framework a new component emerged, a Con guration Manager that manages data to be shared using distributed coordination services, used to apply dynamic rules over the Complex Event Processing Framework. This component is not only a contribution for SELFNET but as well as for Altice Labs. In a more high-level point-of-view, this task brought a new understanding about the role of network management tools for network operators and next-generation networks. Mais do que tendências e domínios de conhecimento exploratórios, existe a forte convicção na industria de que os paradigmas da virtualizaçao das funções de rede (NFV Network Functions Virtualization) e das redes programáveis (SDN Software Defined Networking) vieram para ficar no mundo dos serviços de telecomunicações. Para que possam navegar esta onda de mudança, os operadores terão que evoluir significativamente a arquitectura da sua rede, os seus mecanismos de gestão e, simultaneamente, o seu negocio. Esta Dissertação de Mestrado pretende contribuir para a evolução dos mecanismos de gestão operacional dos operadores, nomeadamente no domínio da supervisão/monitoria. Em concreto, o trabalho a desenvolver no âmbito desta Dissertação de Mestrado terão como principal objectivo a evolução da plataforma de performance management (Altaia) da Altice Labs para o novo paradigma de rede baseado nos conceitos de virtualizaçao (NFV) e programabilidade (SDN). Importa ainda salientar que as actividades desenvolvidas no âmbito deste trabalho estarão enquadradas num projeto de I&D internacional financiado pela Comissão Europeia no âmbito do programa H2020 5G-PPP designado SELFNET (A Framework for Self-Organized Network Management in Virtualized and Software De- fined Networks). A Altice Labs e um dos participantes no consorcio do SELFNET juntamente com outros 10 parceiros internacionais. O projeto tem um âmbito bastante abrangente e pretende endereçar cenarios de Self- Organizing Networks (SON) em contexto NFV/SDN. Uma das ferramentas essenciais para cenários SON é a detecção e predição de potenciais anomalias da rede e dos serviços. E neste contexto que a versão evolução da da plataforma Altaia ser a utilizada no projeto SELFNET. Esta dissertação propõem o desenvolvimento das ferramentas necessárias para modelar, persistir, e realizar processamento de dados provenientes da infraestrutura de rede em tempo real. Mais especificamente, esta dissertação desenvolveu: primeiramente o Raw and Aggregation Data Model, que unificou ambos dados brutos e agregados num único modelo, em segundo o Raw Data Loader, o componente que recebe dados da rede monitorizada e os transforma de forma a serem persistidos, finalmente a Complex Event Processing Framework, uma estrutura de processamento em tempo real para processar dados usando uma abordagem dinâmica baseada em regras. Dos objectivos propostos todos foram desenvolvidos com sucesso. O Raw and Aggregation Data Model, juntamente com o Raw Data Loader, garantem que os sensors do SELFNET cumprem a especificação do modelo, unificando todos os dados de monitoria num único modelo. Alem disso, a Complex Event Processing Framework foi posta em execução, carregada com regras de agregação relativas ao use case Self-Protection do SELFNET, e e capaz de providenciar, em tempo real, informação sobre botnets detectadas na rede. Do processo de desenvolvimento desta framework, surgiu um novo componente denominado de Con guration Manager, que gere dados que são partilhados usando serviços distribudos de coordenação, usado para aplicar regras dinâmicas sobre a Complex Event Processing Framework. Este componente não foi apenas uma contribuição para o SELFNET mas também para a Altice Labs. Esta tarefa levou a que se percebesse qual e o papel das ferramentas de gestão de rede para as operadoras e para as novas gerações de rede.
- Published
- 2017
19. Demonstrador de uma rede de operador com tecnologia openflow e serviços na cloud
- Author
-
Pardal, Gonçalo Neto de Oliveira, Sargento, Susana, and Neves, Pedro Miguel Naia
- Subjects
Network Virtualization ,Computação em nuvem ,openAccess ,Redes distribuídas ,Engenharia electrónica ,Serviços web ,Cloud ,Software De ned Networkin - Abstract
Mestrado em Engenharia Electrónica e Telecomunicações The Internet is currently essential in all its functions to every social layer. The fast and unexpected growth of the largest computer network combined with the gradual change of its main objective forced service providers to nd new solutions to improve and optimize their networks and equipments. The craving for bigger and better services by the users increased the use of Cloud services, demanding computing and network automation, notably in datacenters. After the development of virtualization and the popularity rise in Cloud Computing (CC), the dynamization of the datacenters began. However, although the new paradigm increased the response time and scalability of cloud service provider's infrastructure, the network became the performance bottleneck. To solve this shortcoming, Software De- ned Networks (SDN) appeared. This is a new approach to the classic computer networking paradigm that decouples the control plane from the data plane. Although it is a new technology, its development and usage is having a great acceptance by the market and by big telecommunication and cloud service provider players. At the same time, the development of network virtualization enabled network element abstraction from the hardware. This change granted exibility and scalability in network management that was not available before. With these evolutions in mind, this dissertation objective is to study, develop and analyse an example of a provider core network using Open- ow technology to establish cloud service connections. The rst objective is the study of the existing SDN solutions and the analysis of its capabilities. After this step, a SDN module has been developed to control the network. This application allows users to establish a service in a simple and safe way in the provider network, with easy automation for management. Afterwards, a platform has been deployed and test scenarios have been performed to determine the performance of the implementation in a provider network. To analyze the performance in large-scale networks, scalability tests have been performed in emulated environments. A Internet é actualmente essencial em todas as suas vertentes por todos os estratos sociais. O crescimento r apido e inesperado da maior rede de computação mundial, assim como a alteração gradual do seu principal objectivo, obrigou a que os fornecedores de serviços encontrassem novas maneiras de acelerar e optimizar as suas redes e equipamentos. O desejo de serviços cada vez mais complexos e exigentes por parte dos utilizadores levou ao crescimento de serviços baseados em Cloud, impondo a necessidade de automatização da computação e rede core, especialmente em datacenters. Após o desenvolvimento da virtualização e da popularidade do Cloud Computing (CC) começou o processo de dinamização dos datacen- ters. No entanto, embora este novo paradigma tenha melhorado os tempos de resposta e escalabilidade da infrastrutura dos operadores de serviço Cloud, as redes começaram a ser o componente mais lento e problemático do processo. Para resolver esta lacuna, surgiram as Software De ned Networks (SDN), uma nova abordagem às redes de computação clássicas que permite separar o plano de controlo do plano de dados. Sendo uma nova tecnologia, o seu desenvolvimento e aplicação está a ter uma grande aceitação por parte do mercado e por grandes players nas áreas de comunicações e fornecimento de serviços Cloud. Simultaneamente, o desenvolvimento de virtualização de rede permitiu abstrair elementos da rede da sua componente física permitindo a sua programabilidade. Esta alteração abriu portas a uma liberdade nunca antes vista para a exibilidade e escalabilidade da gestão da rede. Com esta evolução em vista, esta Dissertação tem como objectivo estudar, desenvolver e analizar um demonstrador de uma rede de operador recorrendo ao uso da tecnologia OpenFlow, que permite estabelecer ligações de serviços cloud. O primeiro objectivo centra-se no estudo das soluções existentes em SDN e a análise das suas capacidades. Após este passo foi desenvolvido um módulo SDN que serve como elemento de controlo da rede. Esta aplicação permite aos utilizadores estabelecer um serviço de forma simplificada e segura na rede do operador, com a possibilidade de fácil automação de gestão. Posteriormente foram efectuados testes de integração da plataforma numa rede de teste, de forma a retirar conclusões sobre o desempenho da implementação numa rede de operador. Foram realizados testes de escalabilidade em ambientes emulados para verificar a capacidade da plataforma em redes de grande dimensão.
- Published
- 2014
20. Dairy Products: Is There an Impact on Promotion of Prostate Cancer? A Review of the Literature.
- Author
-
Vasconcelos A, Santos T, Ravasco P, and Neves PM
- Abstract
This review of the literature aims to study potential associations between high consumption of milk and/or dairy products and prostate cancer (PC). Literature is scarce, yet there is a direct relationship between mTORC1 activation and PC; several ingredients in milk/dairy products, when in high concentrations, increase signaling of the mTORC1 pathway. However, there are no studies showing an unequivocal relationship between milk products PC initiation and/or progression. Three different reviews were conducted with articles published in the last 5 years: (M1) PC and intake of dairy products, taking into account the possible mTORC1signaling mechanism; (M2) Intake of milk products and incidence/promotion of PC; (M3) mTORC1 activation signaling pathway, levels of IGF-1 and PC; (M4) mTORC pathway and dairy products. Of the 32 reviews identified, only 21 met the inclusion criteria and were analyzed. There is little scientific evidence that directly link the three factors: incidence/promotion of PC, intake of dairy products and PC, and PC and increased mTORC1 signaling. Persistent hyper-activation of mTORC1 is associated with PC promotion. The activity of exosomal mRNA in cellular communication may lead to different impacts of different types of milk and whether or not mammalian milks will have their own characteristics within each species. Based on this review of the literature, it is possible to establish a relationship between the consumption of milk products and the progression of PC; we also found a possible association with PC initiation, hence it is likely that the intake of dairy products should be reduced or minimized in mens' diet.
- Published
- 2019
- Full Text
- View/download PDF
21. Should omega-3 fatty acids be used for adjuvant treatment of cancer cachexia?
- Author
-
Lavriv DS, Neves PM, and Ravasco P
- Subjects
- Cachexia epidemiology, Cachexia physiopathology, Fatty Acids, Omega-3 adverse effects, Fatty Acids, Omega-3 metabolism, Humans, Muscle, Skeletal metabolism, Neoplasms epidemiology, Neoplasms physiopathology, Quality of Life, Risk Factors, Treatment Outcome, Body Composition, Cachexia drug therapy, Dietary Supplements adverse effects, Fatty Acids, Omega-3 administration & dosage, Muscle, Skeletal physiopathology, Neoplasms therapy, Nutritional Status
- Abstract
Objectives: Cancer cachexia is characterised by a progressive loss of muscle, resulting in functional impairment and shorter survival. Therefore, omega-3 has been studied for its role as an anti-cachectic therapy. This systematic review identified studies published on use of omega-3 in cancer cachexia in order to examine the potential benefit., Methods: A systematic review of the literature using PubMed and B-on databases was conducted to identify clinical trials published between 2000 and 2015, to evaluate the effect of n-3 PUFAs on nutritional features and Quality of Life in cancer cachexia. Of 140 publications, 7 were selected on the basis of their methodological quality, according to the Delphi List. The collected data was summarized and written in text format and in tables., Results: Only one study, made in pre-cachectic population, show statistically and clinically positive intervention. No benefits were observed with the 4 g EPA/day, but a potentially clinically relevant treatment effect with 2 g EPA/day. Lung tumours showed the highest CRP levels and while the weight of patients with gastrointestinal cancer increased significantly, patients with lung cancer showed no significant response., Conclusions: Future cachexia trials would likely benefit from studying a single tumour type with earlier stage disease, with probably different dosage depending on the cancer type and its inflammatory profile., (Copyright © 2018 European Society for Clinical Nutrition and Metabolism. Published by Elsevier Ltd. All rights reserved.)
- Published
- 2018
- Full Text
- View/download PDF
22. The Effect of Flaxseed in Breast Cancer: A Literature Review.
- Author
-
Calado A, Neves PM, Santos T, and Ravasco P
- Abstract
Breast cancer is one of the most common cancers and the second most responsible for cancer mortality worldwide. In 2014, in Portugal approximately 27,200 people died of cancer, of which 1,791 were women with breast cancer. Flaxseed has been one of the most studied foods, regarding possible relations to breast cancer, though mainly in experimental studies in animals, yet in few clinical trials. It is rich in omega-3 fatty acids, α-linolenic acid, lignan, and fibers. One of the main components of flaxseed is the lignans, of which 95% are made of the predominant secoisolariciresinol diglucoside (SDG). SDG is converted into enterolactone and enterodiol, both with antiestrogen activity and structurally similar to estrogen; they can bind to cell receptors, decreasing cell growth. Some studies have shown that the intake of omega-3 fatty acids is related to the reduction of breast cancer risk. In animal studies, α-linolenic acids have been shown to be able to suppress growth, size, and proliferation of cancer cells and also to promote breast cancer cell death. Other animal studies found that the intake of flaxseed combined with tamoxifen can reduce tumor size to a greater extent than taking tamoxifen alone. Additionally, some clinical trials showed that flaxseed can have an important role in decreasing breast cancer risk, mainly in postmenopausal women. Further studies are needed, specifically clinical trials that may demonstrate the potential benefits of flaxseed in breast cancer.
- Published
- 2018
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.