Dissertations / Theses: 'SISP'

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Al-Faidi, Al-Juhani Mohammed H. "Strategic Information Systems Planning (SISP) in the banking sector: An Investigation of Strategic Information Systems Planning (SISP) in the Saudi Banking Sector." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/17372.

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The improvement of SISP practices has rapidly become one of the most critical issues facing many organisations, including banks. Globally, the banking sectors, including the Saudi one, have developed and implemented many IS strategies. Several systems have been executed to support the countries’ economies which have benefited from the increased trading resulting from the greater flexibility in time and costs associated with banking transactions. To continue these achievements and to improve SISP processes, several factors require careful investigation based on their relationship to SISP success; which include SISP objectives, SISP internal factors, external consultant functions, SISP external factors, measurements of SISP success, key stakeholders’ roles, and triggers. Therefore this study investigates the impact of these factors on SISP success. Data were collected in three phases. Phase 1 was an initial study with one or two interviews with the IT directors of each bank in the Saudi banking sector comprising the central bank and 11 commercial banks. The outcomes informed the development of a survey that was used in Phase 2; to investigate a sample containing a central bank, a domestic commercial bank and a domestic-foreign commercial bank to determine their SISP processes. 157 completed questionnaires were returned from the bank executives, business and IT directors and consultants. In Phase 3, 57 interviews confirmed and explained the quantitative results from Phase 2. Therefore, an in-depth case study was made in the three banks during Phases 2 and 3. The research results support previous findings on the SISP’s seventeen objectives collected by several researchers across different industries and in various countries. Furthermore, the research condenses these seventeen objectives into five more practical and achievable objectives for the banking sector. These are: 1) planning and deployment of information systems; 2) leading organisation changes; 3) improving stakeholders’ involvement and communication; 4) achieving the strategic priorities; and 5) alignment of organisational policies and architecture for business and IS. In addition, the findings identify the factors according to their relationship with SISP success and therefore explore several elements with positive, negative or no impact on SISP success in the banking sector. The thesis presents conclusions and suggests areas for further research.

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Pita, Zijad, and zijad pita@rmit edu au. "Strategic Information Systems Planning (SISP) in Australia Assessment and Measurement." RMIT University. Business Information Technology, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080514.162332.

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Strategic Information Systems Planning (SISP) is an important activity for helping Chief Information Executives (CIOs) and top management identify strategic applications and align Information Technology (IT) with business needs. Like all strategic planning, SISP requires measuring how well SISP is done and how planning is improving over time. The measurement of these intangibles is a complex exercise. There have been few efforts undertaken in the Information Systems (IS) literature to formally develop a model for assessing and measuring SISP efforts. In this study, two models were proposed: a five-stage SISP maturity model for defining SISP maturity and another one for assessing the degree of SISP maturity. The five SISP maturity levels were defined as: Rudimentary Planning, Ineffectual Planning, Attainable Planning, Sustainable Planning, and Adaptable Planning. The assessment model was structured as a third-order system, where eight first-order dimensions were termed as Form and Content, Collaboration, Policies, Stakeholders' Designation, Knowledge Bank, Technology, Time Dimension, and Viability. The first-order dimensions were grouped into three second-order constructs, namely Effectiveness, Efficiency and Manoeuvrability, which ultimately characterise the level of SISP success. This model was used to establish a theoretical benchmark for each SISP maturity level. To model the level of SISP maturity, an 'Integral Engineering' approach was established and the Analytic Network Process (ANP) theory was used. The study is a novel approach in using ANP to synthesize the measures of the various SISP constructs into a single overall measure of SISP maturity level. A survey was performed and data collected from 260 Australian organisations to examine the degree of SISP maturity and the relationships among SISP constructs. Structural equation modelling (SEM) was used to test the fit between the hypothesized model and the survey data The models were applied to the data collected and the findings suggested that the models fit the data well. While Effectiveness and Efficiency are well recognised planning constructs, Manoeuvrability as a measure of planning dynamics is not acknowledged in the literature as an equally important construct. This study confirmed a strong correlation between Manoeuvrability and SISP success and found it to be more important than the Efficiency construct. The empirical data did not confirm the existence of Rudimentary and Ineffectual planning levels of SISP maturity Australia-wide. SISP maturity in the majority of Australian organisations is at Sustainable and Attainable planning levels. A small percentage of the surveyed organisations have actually reached the highest planning level (Adaptable planning). The empirical data showed that current SISP is lacking strategic dimension and that the recently popularised one-year planning horizon may not be the best choice. Australian organisations did not consider the strategic relevance of IT as the key objective. IT/IS was seen as a business enabler, thus the strategic advan tage associated with IT came as a secondary objective.

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Warr, Alan Reginald. "A study of the relationships of strategic information systems planning (SISP) approaches, objectives and context with SISP success within UK organisations." Thesis, London Business School (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414817.

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Ali, Liaqat. "Towards organisational cultural alignment of strategic information systems planning (SISP) methodologies." Thesis, De Montfort University, 2000. http://hdl.handle.net/2086/4078.

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Basahel, Abdullah M. "Evaluating the adoption of strategic information systems planning (SISP) in global organisations." Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/4504.

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In a comprehensive review of literature on the strategic adoption of information systems (IS), various approaches to strategic IS adoption were unable to verify and coordinate different factors for IS investment as a strategic business unit. An assessment of different models in this area through the review of empirical case studies was required to identify the factors that affect IS strategic adoption, because these factors support the evaluation and adoption of both the process and result of IS strategic adoption. Thus, a study to investigate and evaluate the adoption of strategic information systems planning (SISP) within organisations is required in order to identify the factors that affect this type of adoption. The research in this thesis takes into account the adoption process and the factors for the adoption of SISP. There is also a need to understand and evaluate different IS planning techniques within a framework that can support decision-makers through the entire IS strategic adoption process. This framework is a component of the proposed novel model that considers other crucial factors that influence IS strategic evaluation and adoption. Decision-makers may employ such a model and evaluation framework that considers important SISP criteria, such as (a) SISP benefits, (b) SISP requirements and, (c) SISP drivers, as an important reference tool. After presenting the conceptual components of this research, the empirical side expresses the application of a qualitative research approach through a case study strategy to investigate the proposed model of SISP adoption. As a result, two global organisations were investigated, reported, and analysed. Additional factors for the adoption of SISP emerged from these analyses. The proposed conceptual model was modified to present 11 factors that influence the adoption of SISP, including (a) planning team; (b) benefits; (c) requirements; (d) drivers; (e) costs; (f) IS performance measurement; (g) framework for the evaluation of SISP techniques; (h) SISP methods; (i) SISP tools; (j) support; and (k) IS strategy. The primary contribution of this thesis is a comprehensive novel model for the evaluation and adoption of SISP. The model includes two levels of original contribution. Firstly, it accounts for previous studies in SISP and their factors, which supports the conceptual level of this contribution. The researcher incorporated and extended these studies to merge the factors which were recognised in the normative literature. In addition, factors from empirical work have also been combined in the proposed model, thus developing a consistent paradigm for the evaluation and adoption of SISP. Secondly, the concept and process of the proposed model can be applied as an educational guide throughout the IS strategic evaluation and adoption process. Nevertheless, this model contains a proposed framework for the evaluation of IS strategic planning techniques as factors that influence the adoption of SISP. This framework is novel, since it is a part of the proposed model as well as a classification of IS planning techniques, and supports decision-makers’ understanding and evaluation of planning techniques during the adoption of SISP.

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Escobar, Fernando. "Uma proposta de desenvolvimento de competências em gestão de riscos utilizando Project Based Learning (PjBL) para o SISP." reponame:Repositório Institucional da UnB, 2015. http://repositorio.unb.br/handle/10482/18715.

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Dissertação (mestrado)—Universidade de Brasília, Instituto de Ciências Exatas, Departamento de Ciência da Computação, 2015.
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Desenvolver competências é uma premissa da gestão contemporânea. A gestão eficaz do risco é crucial para o serviço público atingir seus objetivos. A capacidade de o governo gerenciar riscos depende das competências de seus servidores públicos. Fundamentado nessas premissas, este trabalho teve como objetivo propor um programa de capacitação visando o desenvolvimento de competências em gestão de riscos, utilizando a abordagem instrucional de Project Based Learning (PjBL), direcionado aos membros do Sistema de Administração dos Recursos de Tecnologia da Informação (SISP). Identificou-se quantitativamente o público-alvo do SISP, totalizando 443 servidores públicos; com o apoio do Índice de Estilos de Aprendizagem de Felder-Soloman (ILS), aplicado ao público-alvo do SISP, obteve-se resposta de 229 servidores, com destaque para a identificação dos estilos preferenciais Ativo (52%), Sensorial (74%), Visual (80%) e Global (54%); complementarmente, identificou-se e analisou-se as competências em gestão de riscos para o SISP, priorizadas, com apoio de técnicas de análise multicritério AHP, por treze gestores de tecnologia de informação indicados pelo órgão central do SISP, com destaque para as competências de Planejamento Estratégico, Gerenciamento de Riscos e Critérios de Seleção e Tomada de Decisões; o trabalho também identificou e propôs instrumentos de persuasão que potencializassem a adoção do programa proposto, além de um programa piloto, para sua validação de campo. Conclui-se o trabalho com a proposição de um programa de capacitação visando o desenvolvimento das competências priorizadas em gestão de riscos, utilizando a abordagem instrucional de Project Based Learning (PjBL), com apoio de técnicas e abordagens relacionadas ao estilo de aprendizagem do público-alvo, de forma a potencializar as ações, com o objetivo de desenvolver e aprimorar as competências de Gerenciamento de Projetos; Ética Profissional, Responsabilidade Sócio-Ambiental e Democracia e Cidadania; Planejamento Estratégico; Gerenciamento de Riscos; Critérios de Seleção e Tomada de Decisões; e Liderança. ______________________________________________________________________________________________ ABSTRACT
Developing competencies is a premise of contemporary management. To achieve its objectives, risk management is essential in public service. The government’s ability to manage risk depends on government employee’s skills and competencies. Based on these assumptions, this research propose a training program in order to develop risk management competencies, using the instructional approach of Project Based Learning (PjBL), directed to government employees members of SISP - Administration IT Resources System, part of the Department of Logistics and Information Technology (SLTI / MP), for the Brazilian government. It was identified the SISP target audience in numbers, a total of 443 members; the Index of Learning Styles (ILS), by Richard M. Felder and Barbara A. Soloman, was applied to the SISP audience resulting in 229 responses, featuring the preferred styles as Active (52%), Sensing (74%), Visual (80%) and Global (54%); in addition to that, it was identified and analyzed the competencies in risk management to be developed in SISP - they were prioritized with multi-criteria analysis using the AHP by thirteen IT managers selected by SLTI / MP, highlighting the Strategic Planning, Risk Management and Selection Criteria and Decision Making competencies; the research identified and proposed instruments to support and promote the adoption of the training program, and a pilot project for its field validation. To conclude this work, a training program has been proposed for the development of the prioritized competencies, using the instructional approach of PjBL, using techniques and approaches regarding the target audience learning styles, in order to develop and improve the skills in Project Management; Professional Ethics, Social and Environmental Responsibility and Democracy and Citizenship; Strategic Planning; Risk Management; Selection Criteria and Decision Making; and Leadership.

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Hayward, James T. "Making sense of SISP : the role of vision in strategic information systems planning practice in the UK HE sector." Thesis, Lancaster University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.536042.

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OLIVEIRA, JÚNIOR Nilson Cândido. "Uma proposta de implantação de governança de TIC em instituições federais de ensino." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/15902.

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Governança de TIC no setor público é uma estrutura de iniciativas e processos que visa gerir o controle de toda instituição, com o objetivo de agregar valor ao negócio, equilibrando os riscos e o retorno dos investimentos em TIC. Mas é perceptível que essa adoção ainda é um desafio em Instituições Federais de Ensino, de acordo com os órgãos de controle externo da Administração Pública Federal. Para que se consiga atingir o mínimo de exigência de Governança de TIC, é importante o desenvolvimento de mecanismos que auxiliem sua implantação. O objetivo desta dissertação é desenvolver uma proposta de implantação de Governança de TIC alinhada aos mecanismos que impulsionam a Governança Pública, e que visa impulsionar e facilitar as instituições no amadurecimento de ideias, e na execução de ações para o alcance de um nível mais elevado de maturidade em TIC. Serão considerados, neste contexto, os aspectos que envolvem o setor público, abordando práticas, técnicas e modelos de referência, direcionando a instituição desde a implantação da governança corporativa até a gestão dos serviços, conseguindo assim com a sua realização, obter resultados satisfatórios em um curto ou médio prazo.
ICT governance in the public sector is a framework of initiatives and processes aimed at managing the control of every institution with the goal of delivering business value, through balancing the risk and return on investment in ICT. However, according to external control agencies of the Federal Public Administration, the adoption of ICT governance is still a challenge in Teaching Federal Institutions. In order to achieve the minimum requirement for ICT Governance it is important to develop mechanisms to support its implementation. The objective this master thesis is creation of a proposal for deployment of ICT governance aligned the mechanisms that driving and assist the institutions in the process of maturing ideas, and making easier the execution of actions to achieve a higher level of maturity in ICT governance. Will be considered in the context, the aspects that involving the Public Sector, addressing pratices, technics and reference models, should be directed from the implementation of corporate governance to management of services, thereby achieving satisfactory results in a short to medium term.

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Francisco, Fernando José Harris Pedro. "Compreensão da arquitetura de integração de sistemas de informação heterogéneos e da sua relação com a arquitetura empresarial : um estudo de caso em Portugal." Master's thesis, Instituto Superior de Economia e Gestão, 2011. http://hdl.handle.net/10400.5/4528.

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Mestrado em Gestão de Sistemas de Informação
Este estudo procurou compreender a natureza da relação entre a Arquitetura Empresarial e a Arquitetura de Integração. A Arquitetura Empresarial tem sido defendida como um novo primeiro passo rumo à integração de sistemas. A natureza dos seus atributos - nomeadamente a visão holística da organização em que ela própria é o Sistema de Informação, e a orientação ao processo de negócio - juntamente com as vantagens da sua adoção, parecem enquadrar-se nas características do Enterprise Application Integration (EAI), promovendo o planeamento e implementação de uma mais consistente e flexível Arquitetura de Integração. Todavia, até muito recentemente, não existiam sequer metodologias de modelação para integração de sistemas no contexto do desenho de uma Arquitetura de Sistemas de Informação. O que demonstra que este tema abrangente e na ordem do dia, ainda tem muito por fazer. Com base num modelo conceptual proposto que relaciona as duas arquiteturas quanto à equivalência de layers e ao foco no processo de negócio, este estudo partiu para o terreno no sentido de comprovar a sua validade, procurando um matching de padrões entre o previsto conceptualmente e o observado através de um estudo de caso. A importância da investigação parece ir ao encontro do delineado no seu objetivo, i.e., a compreensão da natureza da relação entre as duas arquiteturas. Compreensão que se expandida, poderá em última instância contribuir para a explicação da importância, mas também das dificuldades, na implementação do SOA e BPM.
The aim of this study is to understand the nature of the relationship between the Enterprise Architecture and Integration Architecture. Enterprise Architecture has been advocated as a first new step towards systems integration. The nature of its attributes -namely the holistic vision of the organization as the Information System itself and its full orientation towards the business process - along with the advantages of its adoption, seems to fit well with the characteristics of Enterprise Application Integration (EAI), promoting the planning and implementation of a more consistent and flexible integration architecture. However, until very recently, there were no modeling methodologies for systems integration in the context of the design of Information Systems Architecture. This shows that this broad and current topic implies much work to be done. Based on a proposed conceptual model that relates the two architectures on the equivalence of its layers and the focus on business processes, this study left for a practical ground in order to prove its validity, looking for a matching pattern between the conceptually expected and the empirically observed through a case study. The importance of the research seems to meet the outlined in its objective, i.e., understanding the nature of the relationship between the two architectures and ultimately contribute to the explanation of the importance and difficulties in the implementation of SOA and BPM.

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Osman, Esam. "Developing strategic information system planning model in Libya organisations." Thesis, University of Plymouth, 2012. http://hdl.handle.net/10026.1/1173.

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This quantitative research study investigated the impact of organisational context on the process and success of strategic IS planning (SISP) in post-implementation information systems in Libyan organisations. A set of direct and indirect relationships were investigated in the research model. The organisational context presented as a contingent situational variable mediated by SISP process and predicted by SISP success (the criterion variable). The causality of the relationship set was developed from the contingency theory of information systems and supported by fit models in strategic management research. The study deployed multivariate analysis represented in the structural equation modelling (SEM) to develop robust construct measurements and analyse data collected from executives responsible for information systems planning in both public and private Libyan organisations. Multi-dimensional multi-items constructs were used in the path analysis model after they were extensively validated. The path analysis model represented as mediation model, where hypothesise suggest that SISP context has an impact SISP success, through the influence of the SISP process. In the model, four dimensions of the SISP context construct were found to have a significant impact on SISP success directly and indirectly through the SISP process. Two of these dimensions are components of the leadership orientation construct, namely “Creative and Controlling” leadership. The other two dimensions are “Organisation centralisation structure and the Riskiness of organisation strategies”. The environmental uncertainty and planning resource constructs were found to have no impact on SISP success in Libyan organisations. Furthermore, this study validated six out of seven dimensions of SISP process construct measurement; only five exhibited acceptable fit level in the path analysis model and all were affected by the SISP context. However, just three out of five SISP process constructs had an impact on SISP success namely “Comprehensiveness, Focus and Intuition planning process”. Different SISP processes were associated with different levels of SISP success, “Intuition” was the most effective SISP process approach. The second most effective SISP process approach was the “Focus on innovation”, followed by “Limited comprehensiveness”. The SISP success measured by the fulfilment of key objectives that has three measurements constructs namely “Analysis, Alignment, and Cooperation”. The research suggest that under the effect of organisation context the most successful SISP produced by (CIO, CEO, or top executives) who rely less on personal judgment, focus more on innovation rather than control and limit their comprehensiveness of information systems planning process.

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Polášek, Jakub. "Návrh a realizace testeru VoIP protokolů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242144.

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This paper deals with ways and means of testing SIP or IAX2 based equipment and protocols itselfs. I analyse terminology and methodology for benchmarking of proxy and registrar servers as it was described in documents RFC 7501 and RFC 7502 from organization IETF. In the practical part is described the tester realization programmed in PHP programming language witch will use described methodology. Aplication is available in web based interface.

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Nallapati, Shiva Chaitanya, and Viswa VardhanReddy Karna. "Performance Evaluation of Various Open Source Projects Providing SIP Functionality." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4061.

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In recent times, the usage of Voice and Video over Internet Protocol (VoIP) services has increased tremendously. There are many signaling protocols such as Bearer Independent Call Control (BICC), H.323, Media Gateway Control Protocol (MGCP), Session Initiation protocol (SIP) etc., that are used for establishment of sessions and to carry out voice and video data services. SIP has become popular because of its easy implementation, flexibility and good scalability. Choice of Open Source SIP server software (OS-SIP Server Software) is important when deploying in a VoIP based network. So we need to evaluate the performance of OS-SIP Server Softwares in an ideal condition before it is deployed to real environment. This document evaluates and compares the performance of three OS-SIP Server Softwares which are quite popular. A SIPp traffic generator tool is used to generate scenarios namely Registration with authentication, Registration without authentication, Session establishment, and Session establishment with response delay at User Agent Server (UAS) side. Using these scenarios, the performance of OS-SIP Server Softwares is evaluated with respect to parameters such as Registrations per second, Calls per second, Response delay, and Percentage of successful calls and registrations. From the experimental results, we observed that there is a significant performance difference among the SIP server softwares. OpenSIPS is the best OS-SIP Server Software for the scenarios Registration with authentication, Registration without authentication and Session establishment with response delay. Asterisk server is the best OS-SIP Server Software when compared with the other two (OpenIMSCore and OpenSIPS) servers for the scenario Session establishment.

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Abreu, Luis Carlos Martins. "Mecanismos de SeleÃÃo de Gale-Shapley DinÃmicos em Universidades Brasileiras: SISU, SISUα, SISU&#946." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10167.

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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico
No Brasil, a busca pela reduÃÃo das ineficiÃncias observadas na alocaÃÃo de vagas em instituiÃÃes de ensino superior via o tradicional vestibular levou Ã formulaÃÃo e implantaÃÃo de um mecanismo alternativo de seleÃÃo para admissÃo superior: o Sistema de SeleÃÃo Unificada (SISU), criado em 2010. O mecanismo, tecnicamente falando, Ã um algoritmo de matching com as seguintes caracterÃsticas: i) cada estudante que recebe oferta de matrÃcula decide por aceitar ou rejeitar a oferta recebida; ii) rejeiÃÃes de ofertas provocam a realizaÃÃo de novas propostas; e iii) propostas sÃo aceitas temporariamente, podendo cada oferta aceita ser âtrocadaâ por uma oferta considerada âmelhorâ. Ou seja, o SISU Ã um mecanismo semelhante ao Algoritmo Deferred Acceptance (Algoritmo Gale-Shapley) com os cursos propondo. Apesar da importÃncia do SISU, a literatura econÃmica sobre o tema Ã basicamente inexistente. Nesse sentido, a presente dissertaÃÃo buscou, Ã luz da teoria dos jogos, entender e caracterizar os incentivos propiciados pelo SISU atravÃs de dois mecanismos teÃricos desenvolvidos, o SISUα e o SISUβ. Ambos sÃo modelados como mecanismos de matching dinÃmicos. Caracterizamos estratÃgias nÃo dominadas para o SISUβ e o SISUα. Utilizando o SISUα como a melhor aproximaÃÃo disponÃvel para o SISU, concluÃmos que a introduÃÃo do SISU apresentou um importante avanÃo em relaÃÃo ao vestibular em termos de ganhos de eficiÃncia do matching entre alunos e cursos.
In Brazil, the quest for reducing observed inefficiencies in the allocation of seats in higher education institutions through traditional examination (Vestibular) led to the formulation and implementation of an alternative mechanism of selection: the Unified Selection System (SISU), created in 2010. Technically speaking, the mechanism is a matching algorithm with the following characteristics: i) each student who receives an offer decides to accept or reject the received offer; ii) rejections of offers prompt new proposals; iii) proposals are accepted temporarily, and each offer can be âreplacedâ by an offer considered âbetterâ. That is, the SISU is a mechanism similar to the Deferred Acceptance Algorithm (Gale-Shapley Algorithm). Despite the importance of SISU, the economic literature on the subject is basically nonexistent. In this sense, this dissertation sought, in light of game theory, to understand and characterize the incentives provided by SISU through two developed theoretical mechanisms, the SISUα and SISUβ. Both are modeled as dynamic matching mechanisms. We characterize undominated strategies for SISUβ and SISUα. Using SISUα as the best approximation available to SISU, we conclude that the introduction of SISU showed a significant improvement on Vestibular in terms of gains of efficiency from matching between students and courses.

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Abreu, Luís Carlos Martins. "Mecanismos de seleção de Gale-Shapley dinâmicos em Universidades Brasilieiras; SISU, SISU (Alpha) e SISU (beta)." reponame:Repositório Institucional da UFC, 2013. http://www.repositorio.ufc.br/handle/riufc/5453.

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In Brazil, the quest for reducing observed inefficiencies in the allocation of seats in higher education institutions through traditional examination (Vestibular) led to the formulation and alternative mechanism of selection: the Unified Selection System (SISU), created in 2010. Technically speaking, the mechanism is a matching algorithm with the following characteristics: i) each student who receives an offer decides to accept or reject the received offer; ii) rejections of offers prompt new proposals; iii) proposals are accepted temporarily, and each offer can be “replaced” by an offer considered “better”. That is, the SISU is a mechanism similar to the Deferred Acceptance Algorithm (Gale-Shapley Algorithm). Despite the importance of SISU, the economic literature on the subject is basically nonexistent. In this sense, this dissertation sought, in light of game theory, to understand and characterize the incentives provided by SISU through two developed theoretical mechanisms, the SISU and SISU . Both are modeled as dynamic matching mechanisms. We characterize undominated strategies for SISU and SISU . Using SISU as the best approximation available to SISU, we conclude that the introduction of SISU showed a significant improvement on Vestibular in terms of gains of efficiency from matching between students and courses.
No Brasil, a busca pela redução das ineficiências observadas na alocação de vagas em instituições de ensino superior via o tradicional vestibular levou à formulação e implantação de um mecanismo alternativo de seleção para admissão superior: o Sistema de Seleção Unificada (SISU), criado em 2010. O mecanismo, tecnicamente falando, é um algoritmo de matching com as seguintes características: i) cada estudante que recebe oferta de matrícula decide por aceitar ou rejeitar a oferta recebida; ii) rejeições de ofertas provocam a realização de novas propostas; e iii) propostas são aceitas temporariamente, podendo cada oferta aceita ser “trocada” por uma oferta considerada “melhor”. Ou seja, o SISU é um mecanismo semelhante ao Algoritmo Deferred Acceptance (Algoritmo Gale-Shapley) com os cursos propondo. Apesar da importância do SISU, a literatura econômica sobre o tema é basicamente inexistente. Nesse sentido, a presente dissertação buscou, à luz da teoria dos jogos, entender e caracterizar os incentivos propiciados pelo SISU através de dois mecanismos teóricos desenvolvidos, o SISU e o SISU . Ambos são modelados como mecanismos de matching dinâmicos. Caracterizamos estratégias não dominadas para o SISU e o SISU . Utilizando o SISU como a melhor aproximação disponível para o SISU, concluímos que a introdução do SISU apresentou um importante avanço em relação ao vestibular em termos de ganhos de eficiência do matching entre alunos e cursos.

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Dhainaut, Guillaume. "A reverse proxy for VoIP : Or how to improve security in a ToIP network." Thesis, KTH, Kommunikationsnät, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183034.

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The need for security is crucial in Telephony over IP (ToIP). Secure protocols have been designed as well as specific devices to fulfill that need. This master thesis examines one of such devices called Session Border Controller (SBC), which can be compared to reverse proxies for ToIP. The idea is to apply message filters to increase security. This thesis presents the reasons of SBC existence, based on the security weaknesse sa ToIP network can show. These reasons are then used to establish a list of features which can be expected from a SBC and discuss its ideal placement in a ToIP network architecture. A test methodology for SBCs is established and used on the free software Kamailio as an illustration. Following this test, improvements of this software, regarding threats prevention and attacks detection, are presented and implemented.
Behovet av säkerhet är av avgörande betydelse i telefoni över IP (ToIP). Säkerhetsprotokoll har utformats samt särskilda enheter för att uppfylla detta behov. Detta examensarbete undersöker en av sådana enheter som kallas Session Border Controller (SBC), vilket kan jämföras med omvända proxyservrar för ToIP. Tanken är att tillämpa meddelandefilter för att öka säkerheten. Denna avhandling presenterar orsakerna till SBC existens, baserat på de säkerhets svagheter en ToIP nätverk kan visa. Dessa skäl används sedan för att upprätta en förteckning över egenskaper som kan förväntas av en SBC och diskutera dess ideal placering i en ToIP nätverksarkitektur . En testmetodik för SBC är etablerad och används på fri programvara Kamailio som en illustration. Efter detta test, förbättringar av denna programvara, om hot förebyggande och attacker upptäcka, presenteras och genomförs.

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Kakvic, Martin. "Metody zabezpečení IP PBX proti útokům a testování odolnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-220331.

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This diploma thesis focuses on attacks on PBX Asterisk, FreeSWITCH and Yate in LTS versions. In this work was carried out two types of attacks, including an attack DoS and the attack Teardown. These attacks were carried out using two different protocols, SIP and IAX. During the denial of service attack was monitored CPU usage and detected if its possible to establish call and whether if call can be processed. The Security of PBX was build on two levels. As a first level of security there was used linux based firewall netfilter. The second level of security was ensured with protocols TLS and SRTP.

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Regard, Charles. "Qualification accélérée des composants SiP." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14097/document.

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NXP Semiconductor à Caen ayant des compétences dans le développement destechnologies System in Package (SiP) et NXP Semiconductor à Eindhoven ayant unespécialité en qualification virtuelle, deux partenariats ont été mis en place pour réaliser uneétude sur la qualification accélérée des composants SiP. Une thèse orientée simulations a étéréalisée à l'université de Delft (Pays-Bas) par Xiaosong Ma et dirigée par Kaspar Jansen, enparallèle une thèse plus expérimentale a été réalisée avec l'université de Bordeaux 1 parCharles Regard, à Caen, et dirigée par Hélène Frémont. Ces deux thèses ont été effectuées enproche collaboration. Dans un premier temps, des véhicules de test ont été définisconjointement. Puis un ensemble de caractérisations des matériaux et de simulations a étémené à Delft, alors que des essais expérimentaux de qualification et des analyses dedéfaillance étaient menés à Caen. Tout au long de ces deux thèses, des échanges constants ontété entretenus afin de corréler les simulations par les expérimentations. Ce besoin industrield'étude sur la qualification des composants SiP vient de la très forte augmentation del'intégration des fonctions au sein des équipements mobiles. En effet la technologie SiPpermet de répondre dans des délais intéressants aux nécessités de miniaturisation imposéespar ces nouveaux développements.L'objectif de ce travail de thèse est donc de mettre en place des méthodes et destechniques pour optimiser la qualification des composants System in Package (SiP)
NXP Semiconductor at Caen, which has System in Package (SiP) technologiesdevelopment competences and NXP Semiconductor at Eindhoven, which has virtualqualification specialization jointed to study fast reliability qualification of SiP products. Athesis focused on simulations started at TU Delft University (Netherlands) with Xiaosong Madirected by Kaspar Jansen and another thesis focused on experimentation started atBordeaux 1 University with Charles Regard directed by Hélène Frémont. These thesis werelead on close collaboration. In a first time, the tests vehicles were defined by both the PhDstudents. Then materials characterizations and simulations were performed at TU Delft, andexperimental qualification tests and physical analyses were performed in Caen. A long ofthese thesis, constant exchanges allowed to correlate simulations by experimentation. Thisindustrial need of SiP product qualification study is due to the strong increase of functionsintegration into mobile equipments. Thus the SiP technology allows to provide in relativeshort time miniaturized products imposed by the new developments.This thesis work's goal is to get methods and techniques to optimize System inPackage (SiP) reliability qualification

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Guerra, Carlos Humberto Martins Chagas. "Gateway SIP - Asterisk." Master's thesis, Universidade de Évora, 2012. http://hdl.handle.net/10174/15430.

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Esta tese consiste num estudo realizado sobre a tecnologia VoIP (Voice over IP) com aplicação dentro da área dos PBX(Private Branch eXchange) e Gateways VoIP Open Source. Em primeiro lugar foram abordados os conceitos, requisitos e elementos associados a esta tecnologia bem como a sua interligação com outras tecnologias de comunicação como a PSTN (Public Switched Telephone Network) , ISDN (Integrated Services Digital Network) ou GSM (Groupe Special Mobile).Al ém disso, foi efectuado um estudo teórico e prático sobre o software Open Source Asterisk, tendo com objectivo explorar o seu modo de funcionamento e funcionalidades disponíveis, passiveis de serem utilizadas em ambiente empresarial. Por fim, foi desenvolvida uma solução assente neste tipo de tecnologia na empresa Clidis - Laboratório de Análises Clinicas de Sines, onde ficou provado que a implementação de PBX/Gateways VoIP através de software Open Source e uma alternativa viável às reais necessidades de comunicação das empresas; ABSTRACT: This thesis is a study on VoIP (Voice over IP) application within the area of PBX (Private Branch eXchange) and VoIP Open Source Gateways. Firstly were addressed the concepts, requirements and elements associated with this technology and its interconnection with other communications technologies such as PSTN (Public Switched Telephone Network), ISDN (Integrated Services Digital Network) or GSM (Groupe Special Mobile). Furthermore, a study was carried out on the theoretical and practical Asterisk Open Source software, with the aim to explore its operation and features available, liable to be used in business environment. Finally, we developed in the company Clidis (Laboratory of Clinical Analyses in Sines) a solution based on this technology, where it was proved that the implementation of PBX / VoIP Gateways through Open Source software is a viable alternative to the real needs of business communication.

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Dušek, Martin. "Implementace protokolu SIP." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218958.

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This Master’s thesis deals in detail with the SIP protocol – a method of communication between two entities, various types of transmitted messages and their content. Few SIP libraries are introduced and two of them are used for development of an application for audio/video conference-calls. Compilation of OPAL and PTlib libraries for Windows 7 Professional (64bit) is described, and problems resulting from lack of information provided by authors. New improved “how to build” is presented. At the end, paper focuses on several ways of development of mentioned application.

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Lulkin, Sérgio Andrés. "O riso nas brechas do siso." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/10256.

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A tese aborda o humor e o riso na educação, sob duas perspectivas: a primeira, os compreende como objetos da história e da filosofia conforme a tradição ocidental; a outra, na qual o bufão, valendo-se dos dispositivos do riso e da máscara, é o arquétipo que vem dialogar com o professor e acompanhar o processo pedagógico. A tese advoga por um personagem conceitual, de caráter grotesco, para tensionar a lógica dos discursos. A metodologia, embalada pelos matizes de Nietzsche quando desenha um futuro para a Gaia Ciência, potencializada por Bakhtin e a condição coletiva dos enunciados, sustentada entre a tensão da razão estética, de Chantal Maillard, e o riso sagrado, de Georges Bataille, é a da dramatização no interior do pensamento. Esse exercício permite circular por dispositivos nos quais o diálogo do pedagogo com os seus parceiros se mobiliza e abre a guarda que impede a aproximação do contra-senso, no fronteira com a lógica previsível. Desde a tradição helênica até o mundo contemporâneo, o humor e o riso vão ganhando formas de controle e adequação, e aquilo que se presta ao ridículo/risível é cercado por seus limites éticos. A pesquisa permite uma aproximação com narrativas de professores e com registros detalhados de eventos escolares, dando atenção às diferentes definições da ironia, da paródia, da sátira e do grotesco. Os textos históricos e as narrativas contemporâneas formam um panorama que evidencia, para além da manifestação sensível de um estado de ânimo, a necessidade de conhecimento do riso e de suas estratégias de sobrevivência no intervalo dos discursos monológicos ou didáticos. O humor e o riso, nesse contexto, são vistos ora como potentes catalizadores da crítica, ora como artifícios convenientes, tratados como um bálsamo para os acordos e conflitos dentro de uma comunidade. O movimento fundamental, para a dinâmica do diálogo interno entre o professor e seus duplos, se encontra na espiral, que habita o ventre do poder e está no cerne do chapéu de guizos do bufão.
This dissertation discusses humour and laughter in education from two perspectives: the first one focusing them as objects of history and philosophy, in the Western tradition; the second one, where the buffoon, through the devices of laughter and mask, is the archetype that establishes a dialogue with the teacher and follows the pedagogical process. The thesis argues for a conceptual character, with grotesque characteristics, to strain the logic of discourse. The methodology used is dramatization within thought, inspired by Nietzsche’s hues when he designs a future for Gaya Science, potentialized by Bakhtin and the collective condition of enunciations, and balancing upon Chantal Maillard’s tension of the aesthetic reason and the sacred laughter of Georges Bataille. This exercise allows the reinvention of devices where the teacher’s dialogue with his/her humorous partners is mobilized and thus lowers the guard that prevents an approximation with nonsense, on the borders of predictable logic. From the Hellenic traditions to the contemporary world, humour and laughter are given control and adjustment, and the theme or object of ridicule is surrounded by ethical restrictions. The research allows an approximation with teachers’ narratives and detailed records of classroom events focusing on different definitions of irony, parody, satire and the grotesque. Historic texts and contemporary narratives form a panorama that make evident, beyond the sensible manifestation of a state of mind, a need for knowledge about laughter and its survival strategies in the interval of monological or didactic discourses. Humour and laughter, in this context, are seen sometimes as powerful catalysts of criticism, and other times as convenient artifices, used as a balsam for the agreements and conflicts within a community. The fundamental movement for the dynamics of the internal dialogue between the teacher and his/her doubles lies in the spiral that resides in the belly of power and is the core of the buffoon’s cap’n bells.

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Schmolze, Mark Manuel [Verfasser], and Norbert [Akademischer Betreuer] Graf. "Evaluation der Therapiestudien SIOP 9/GPO, SIOP 93-01/GPOH und SIOP 2001/GPOH zur Behandlung von Patienten mit bilateralen Nierentumoren / Mark Manuel Schmolze. Betreuer: Norbert Graf." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2014. http://d-nb.info/1056906960/34.

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22

Jacobson, Brian Ratcliff. "A micromachined SIS mixer." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12026.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
Includes bibliographical references (p. 158-160).
by Brian Ratcliff Jacobson.
M.S.

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23

Asghar, Gulfam, and Qanit Jawed Azmi. "Security Issues of SIP." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6018.

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Voice over IP (VoIP) services based on Session Initiation Protocol (SIP) has gained much attention as compared to other protocols like H.323 or MGCP over the last decade. SIP is the most favorite signaling protocol for the current and future IP telephony services, and it‘s also becoming the real competitor for traditional telephony services. However, the open architecture of SIP results the provided services vulnerable to different types of security threats which are similar in nature to those currently existing on the Internet. For this reason, there is an obvious need to provide some kind of security mechanisms to SIP based VOIP implementations. In this research, we will discuss the security threats to SIP and will highlight the related open issues. Although there are many threats to SIP security but we will focus mainly on the session hijacking and DoS attacks. We will demonstrate these types of attacks by introducing a model/practical test environment. We will also analyze the effect and performance of some the proposed solutions that is the use of Network Address Translation (NAT), IPSec, Virtual Private Networks (VPNs) and Firewalls (IDS/IPS) with the help of a test scenario.

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24

Thorell, Pierre. "SISU Idrottsutbildarnas cirkelledare : - kompetens och upplevda kompetensutvecklingsbehov." Thesis, Växjö University, School of Education, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-727.

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Inom SISU Idrottsutbildarna diskuterades cirkelledarrollen intensivt under 2005. Ett stort antal personer inom organisationen hade åsikter om hur det förhöll sig med cirkelledarnas kompetens och utbildning. Det visade sig att ingen egentligen visste då det inte fanns några undersökningar gjorda inom området. I detta skede bestämde jag mig för att ta reda på mer om cirkelledarnas kompetens och vilka behov som de själva upplevde sig ha när det gäller kompetensutveckling. För att besvara frågeställningarna genomfördes en enkätundersökning som förmedlades ut till 75 cirkelledare i Kronobergs län. Svarsfrekvensen blev 46 enkäter, 61%. I uppsatsens bakgrund behandlas folkbildningens historia, studiecirkelns uppkomst, pedagogisk metod och regler inom folkbildningen. De teoretiska utgångspunkterna delades in i två avsnitt, bildning och kompetens. Resultatet av undersökningen visar att de flesta av SISU:s cirkelledare är kompetenta för sitt uppdrag. De har en god kännedom om folkbildningen och dess metoder. De träffar som de genomförde bygger i hög grad på den ursprungliga tanken med folkbildningen, att människor möts, samtalar och lär av varandra i grupp. Många av dem har varit cirkelledare i flera år och i ett flertal cirklar varje år. 60% av cirkelledarna i undersökningsgruppen har genomgått en cirkelledarutbildning hos SISU. Cirkelledarna ansåg sig ha behov av kompetensutveckling i ämnena pedagogik och ledarskap för att kunna genomföra sitt uppdrag bättre. Cirkelledarna ansåg att det är inom dessa områden som SISU bör erbjuda kompetensutveckling.

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25

Yard, Deborah Ann. ""Esoteric Sips": Dickinson's Wine and Liquor Imagery." W&M ScholarWorks, 1995. https://scholarworks.wm.edu/etd/1539625983.

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26

Dang, Xiaoyu. "Offset QPSK in SISO and MIMO Environments." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1751.

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We demonstrate how the performance of offset quadrature phase-shift keying (OQPSK) and its variants of Feher-patented QPSK (FQPSK) and Shaped Offset QPSK (SOQPSK) (collectively known as the ARTM Tier-1 waveforms) in single input single output (SISO) system could change with the channel fading parameters. The bit error rate expression of offset QSPK and ATRM Tier-1 waveforms over the aeronautical telemetry multipath channel has been derived. Simulations show that for the case of a single multipath ray, the BER gets worse with increasing Γ for a fixed delay, and that the BER has a quasi-periodic property for fixed Γ and increasing τ. For the case of two multipath rays, the multipath component characterized by large amplitude and small delay is the main factor of the BER degradation, while the BER is not very sensitive to the change of multipath delay. Analysis of the average bit error probability shows that a relatively high error floor at approximately 10−2 occurs for |Γ1| ≥ 0.5. When offset quadrature phase-shift keying (OQPSK) is used in multiple input multiple output (MIMO) environment, orthogonal space-time block codes can be applied to waveforms to orthogonalize a space-time coded multiple-input, multiple output link. For offset QPSK, this technique has the advantage of eliminating the I/Q interference associated with simultaneous transmission of offset QPSK waveforms. In addition, orthogonalization presents uncorrelated noise samples to the space-time trellis decoder. As a consequence, a less complex space-time decoder (relative to what would be required without orthogonalization) can be used. It is demonstrated that a concatenated system based on an orthogonal space-time block code and a trellis code, optimized for single-input, single-output fading channel, outperforms a space-time trellis code for a 2x1 system. The space-time block code orthogonalizes the channel seen by the outer code and this simplifies the computations required for decoding. The advantages of orthogonalization are achieved at the expense of rate. In the examples presented, the codes were chosen to have roughly equivalent bit error rate performance and identical code rates: the complexity was compared.

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Rungthonkit, Prathan. "Structural behaviour of structural insulated panels (SIPS)." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3561/.

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The Structural Insulated Panel System (SIP system) has recently attracted continuingly growing interest since it is strong, energy efficient, easy to use in construction and hence has a potential to become a new alternative building material. It is anticipated that Structural Insulated Panels (SIPs) are required to withstand loads in various directions either individually or in combinations, e.g., the axial, racking and transverse loadings. Very few publications report the performance of SIPs when subjected to loads in multiple directions. Moreover, when applying SIPs as a load bearing material, there is another major concern related to their long-term performance, mainly caused by creep. This research presents studies on structural behaviours of the SIPs under both short-term and long-term loadings under single and multi-axial loadings together with two typical joint designs i.e. mini-SIP and dimensional timber spline joints with and without openings by experimental, analytical and numerical investigations. It has been demonstrated that the developed numerical models can well predict the initiation of failure load and the failure mode of SIPs. Interactive failure load curves between axial and transverse loadings have been developed by carrying out a parametric analysis for SIPs with/without openings by using two types of joint construction.

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Werkmeister, Jaime Brooke 1977. "Development of silicon insert molded plastic (SIMP)." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32395.

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Thesis (Mech. E.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.
Includes bibliographical references (p. 85-86).
As demand for smaller devices continues to increase, current manufacturing processes will find it more challenging to meet cost, quantity, and dimensional requirements. While microfabrication technology processes can create electronic devices in vast quantities with increasingly smaller dimensions, they are challenged to do so for mechanical devices at low cost and in large quantity. More traditional manufacturing processes such as machining or injection molding can more easily meet cost and quantity requirements, but are unable to currently match the dimensional abilities of microfabrication processes. By merging microfabrication and traditional injection molding techniques, the benefits of both technologies can be combined to produce parts to meet all three requirements. The objective of this research is to investigate the possibilities of injection molding polymer parts with sub-micron three-dimensional features using a process called Silicon Insert Molded Plastics (SIMP).
by Jaime Brooke Werkmeister
Mech.E.

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Ebling, Mario. "SISPE : sistema de planejamento e controle gerencial." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 1986. http://hdl.handle.net/10183/19115.

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Esta dissertação descreve o desenvolvimento de um sistema de planejamento e controle gerencial que utiliza a metodologia PERT/CPM. O objetivo do trabalho foi a criação de um sistema de planejamento voltado ao pequeno e médio usuário que permitisse grande interação deste com o problema. São descritas todas as fases do projeto, desde as análises iniciais do problema e proposta de alternativas para o modelo de representação, até a descrição da implementação. A implementação foi realizada em um computador do tipo APLLE II dando especial atenção ao projeto do diálogo usuário-sistema.
This work describes the development of a planning, management and control system based on the PERT/CPM methodology. The goal was to develop an interactive planning system to be used by the small and middle user. All the project phases are describe, from the problem analysis and alternatives of model representation up to the description of the implementation. The implementation was made in a Apple II computer emphasizing the project of the user - system language.

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Buennemeyer, Timothy Keith. "Battery-Sensing Intrusion Protection System (B-SIPS)." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/30037.

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This dissertation investigates using instantaneous battery current sensing techniques as a means of detecting IEEE 802.15.1 Bluetooth and 802.11b (Wi-Fi) attacks and anomalous activity on small mobile wireless devices. This research explores alternative intrusion detection methods in an effort to better understand computer networking threats. This research applies to Personal Digital Assistants (PDAs) and smart phones, operating with sensing software in wireless network environments to relay diagnostic battery readings and threshold breaches to indicate possible battery exhaustion attack, intrusion, virus, and worm activity detections. The system relies on host-based software to collect smart battery data to sense instantaneous current characteristics of anomalous network activity directed against small mobile devices. This effort sought to develop a methodology, design and build a net-centric system, and then further explore this non-traditional intrusion detection system (IDS) approach. This research implements the Battery-Sensing Intrusion Protection System (B-SIPS) client detection capabilities for small mobile devices, a server-based Correlation Intrusion Detection Engine (CIDE) for attack correlation with Snortâ s network-based IDS, device power profiling, graph views, security administrator alert notification, and a database for robust data storage. Additionally, the server-based CIDE provides the interface and filtering tools for a security administrator to further mine our database and conduct forensic analysis. A separate system was developed using a digital oscilloscope to observe Bluetooth, Wi-Fi, and blended attack traces and to create unique signatures. The research endeavor makes five significant contributions to the security field of intrusion detection. First, this B-SIPS work creates an effective intrusion detection approach that can operate on small, mobile host devices in networking environments to sense anomalous patterns in instantaneous battery current as an indicator of malicious activity using an innovative Dynamic Threshold Calculation (DTC) algorithm. Second, the Current Attack Signature Identification and Matching System (CASIMS) provides a means for high resolution current measurements and supporting analytical tools. This system investigates Bluetooth, Wi-Fi, and blended exploits using an oscilloscope to gather high fidelity data. Instantaneous current changes were examined on mobile devices during representative attacks to determine unique attack traces and recognizable signatures. Third, two B-SIPS supporting theoretical models are presented to investigate static and dynamic smart battery polling. These analytical models are employed to examine smart battery characteristics to support the theoretical intrusion detection limits and capabilities of B-SIPS. Fourth, a new genre of attack, known as a Battery Polling Cycle Timing Attack, is introduced. Todayâ s smart battery technology polling rates are designed to support Advanced Power Management needs. Every PDA and smart phone has a polling rate that is determined by the device and smart battery original equipment manufacturers. If an attacker knows the precise timing of the polling rate of the batteryâ s chipset, then the attacker could attempt to craft intrusion packets to arrive within those limited time windows and between the batteryâ s polling intervals. Fifth, this research adds to the body of knowledge about non-traditional attack sensing and correlation by providing a component of an intrusion detection strategy. This work expands todayâ s research knowledge towards a more robust multilayered network defense by creating a novel design and methodology for employing mobile computing devices as a first line of defense to improve overall network security and potentially through extension to other communication mediums in need of defensive capabilities. Mobile computing and communications devices such as PDAs, smart phones, and ultra small general purpose computing devices are the typical targets for the results of this work. Additionally, field-deployed battery operated sensors and sensor networks will also benefit by incorporating security mechanisms developed and described here.
Ph. D.

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BARBOSA, Salomão Gomes. "Obtenção e caracterização mecânica e microestrutural do compósito Al-5, OSi-1, OCu/SiCp produzido por reofundição." Universidade Federal de Pernambuco, 2006. https://repositorio.ufpe.br/handle/123456789/5571.

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Made available in DSpace on 2014-06-12T17:40:23Z (GMT). No. of bitstreams: 2 arquivo7619_1.pdf: 7589612 bytes, checksum: c8f98011c532b8094c060c73fab5f0e5 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2006
O compósito Al-5,0Si-1,0Cu/SiCP reforçado com diferentes frações volumétricas de partículas de carbeto de silício (SiCP) foi elaborado e caracterizado microestruturalmente neste trabalho. A liga mãe foi elaborada pelo processo de fundição convencional num forno de indução de 24 KVA num cadinho de grafita. Depois de fundida e homogeneizada (T1050oC), a liga foi retirada do forno para resfriamento natural no próprio cadinho. Ao atingir 800oC, foi iniciada a agitação do fundido, onde o reforço de carbeto de silício (SiCP) foi incorporado sob agitação mecânica, a uma velocidade de 400 rpm. As partículas do reforço com granulometria de referência P-220, P-320 e P-800 (com tamanhos médios 66 m, 46,2 m e 21 m, respectivamente). Foram usadas as proporções de 2, 4, 8 e 12% de SiCP, (% em peso). Em temperaturas do intervalo de solidificação (630-620oC 3oK), a liga reforçada foi vazada num molde metálico, previamente aquecida a 600oC e vibrando numa freqüência de 200 Hz. Após a solidificação, foram retiradas as amostra de cada lingote bruto para caracterização microestrutural. Os resultados mostraram a viabilidade do método de incorporação do reforço, uma vez que não existe reação química (formação de carbeto de alumínio-Al4C3) na interface matriz/partícula, apesar da boa molhabilidade. As análises microestruturais revelaram um material bem estruturado, constituído pelas fases alfa primária, beta eutético e partículas de SiCP, dispersas por toda a matriz de alumínio, porém majoritariamente nos contornos. O comportamento mecânico destes materiais foi avaliado por ensaios de resistência à flexão a três pontos. A resistência à flexão foi levantada considerando-se os efeitos da fração incorporada, da granulometria e de um tratamento térmico suplementar. Os resultados mostraram que a resistência tende a aumentar com tratamento suplementar e com a fração volumétrica do reforço até 8%, aproximadamente. A partir desta fração, a resistência à flexão diminuiu e este comportamento foi justificado com base nas condições reológicas do processo. Os compósitos com matriz de alumínio reforçados com partículas de carbeto de silício (SiCP) mostraram-se muito promissores para aplicação em peças resistentes ao desgaste usadas na indústria automotiva e de petróleo. As possibilidades de aplicação deste material produzido por reofundição ampliam-se pelo fato de poderem de ser trabalhados a quente por laminação ou extrusão, desde que sejam controlados o tamanho e a morfologia (quantidade e dispersão) do reforço na matriz

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32

Al-Canaan, Amer. "Création de services de télécommunications en utilisant le protocole SIP et l'API JAIN-SIP." [S.l. : s.n.], 2005.

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Al-Canaan, Amer. "Création de services de télécommunications en utilisant le protocole SIP et l'API JAIN-SIP." Mémoire, Université de Sherbrooke, 2005. http://savoirs.usherbrooke.ca/handle/11143/1301.

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L'évolution du domaine des télécommunications et des réseaux d'Internet a abouti à l'intégration et la collaboration de ces deux domaines, ce qui a favorisé des résolutions de plusieurs problèmes de la téléphonie traditionnelle. Afin d'élargir les zones de services au-delà des frontières et des continents, les grandes compagnies de télécommunications et d'Internet ont investi dans le domaine des protocoles de signalisation dont H.323, MGCP (Media Gateway Control Protocol) et SIP. Depuis que l'Internet est devenu répandu, la téléphonie sur l'Internet (ou la téléphonie IP) est devenue populaire et fiable, ce qui a augmenté les demandes de services. SIP a été conçu pour remplacer le protocole H.323, étant plus simple et plus efficace. SIP est fondé sur le protocole HTTP. L'utilisation de SIP permet de concevoir des services de téléphonie IP qui s'intègrent facilement dans les réseaux informatiques. Comparativement à H.323 et MGCP, SIP est plus léger et plus simple. De plus, SIP est horizontal puisqu'il utilise des protocoles IP, ce qui le rend intéressant au niveau de l'implantation et de la création de services traditionnels et même des nouveaux services qui nécessitent de l'interaction avec les applications et les protocoles sur l'Internet. La motivation de ce travail vient de la croissance de la demande des services IP et le besoin de nouvelles méthodes plus simples et fiables s'intégrant aux réseaux de l'Internet afin de répondre à la résolution de la problématique de la création de services de télécommunications. Le premier objectif de ce travail est d'étudier et de proposer des solutions de conception de services dans l'environnement SIP. Le deuxième objectif est de proposer des solutions de réalisation et de mise en oeuvre de ces services.

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O'Dwyer, John Gerard. "Creep performance of SiCp reinforced aluminium alloy 2618A." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313719.

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SOTOMAYOR, CESAR AUGUSTO MEDINA. "CDMA BLOCK TRANSMISSION IN SISO AND MISO CHANNELS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=14305@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Nesta tese é abordada a transmissão CDMA (Code Division Multiple Access) por blocos em canais SISO (Single Input - Single Output) seletivos em frequência. Considera-se a transmissão tanto em portadora única quanto multiportadora, com intervalo de guarda do tipo prefixo cíclico e do tipo preenchimento de zeros. São investigadas estruturas de detecção multiusuário às cegas, baseadas no critério de míınima variância com restrições lineares. Implementações adaptativas do tipo gradiente estocástico e do tipo míınimos quadrados são apresentadas e novos algoritmos de estimação de canal são propostos. É também discutida nesta tese a transmissão CDMA por blocos em canais MISO (Multiple Input - Single Output) seletivos em frequência. Considera-se, assim como no canal SISO, os casos de transmissão em portadora única e multiportadora, incorporando intervalos de guarda do tipo prefixo cíclico e do tipo preenchimento de zeros. Para este tipo de sistema, duas estruturas de transmissão são propostas e uma análise do ganho de diversidade para cada tipo de estrutura é conduzido, identificando as condiçõoes para atingir o máximo ganho de diversidade. Um detector baseado no critério de mínimo erro quadrático médio é implementado para cada estrutura e, no caso da primeira estrutura de transmissão, um detector às cegas baseado no critério de mínima variância é proposto. Uma implementação adaptativa do tipo mínimos quadrados é apresentada e novos algoritmos de estimação de canal são propostos.
This thesis addresses block CDMA (Code Division Multiple Access) transmission in frequency selective SISO (Single Input - Single Output) channels. Both multicarrier and single carrier transmission are considered with cyclic prefix and zero padding as guard interval. Blind multiuser detection based on the linearly constrained minimum variance criterion is investigated. Stochastic gradient and recursive least squares implementations are presented and new channel estimation algorithms are proposed. It is also discussed in this thesis block CDMA transmission in frequency selective MISO (Multiple Input - Single Output) channels, including, as in the SISO channel, the case of multicarrier and single carrier transmission with cyclic prefix and zero padding as guard interval. Two structures are proposed for transmission in this scenario, an analysis of the diversity gain for each type of structure is conducted and conditions for achieving the maximum diversity gain are identified. A detector based on the minimum mean square error criterion is implemented for each structure. Recursive least squares implementations are presented and new blind channel estimation algorithms are proposed.

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Amanzo, Lopez Cesar Francisco, Portilla Alexander Dany Ascarruz, Vitorino Jose Luis Aymar, and Lazo Hector Manuel Briceño. "Práctica Médica Sist. Circulatorio y Respiratorio - ME146 201801." Universidad Peruana de Ciencias Aplicadas (UPC), 2018. http://hdl.handle.net/10757/627388.

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Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico del ciclo 3, en el que los estudiantes al establecer una buena relación con el paciente y/o familiar realizan la anamnesis, que es una entrevista dirigida al problema de salud que presenta el paciente, realizan el examen físico e integran conocimientos que servirán para establecer un diagnostico por síndromes o problemas circulatorio y respiratorio. El curso de Práctica Médica Sistema Circulatorio y respiratorio busca desarrollar la competencia específica de práctica clínica-diagnóstico (nivel 1) y profesionalismo-sentido ético y legal y responsabilidad profesional (nivel 1). La elaboración de una historia clínica orientada por problemas permitirá al estudiante en el futuro, plantear un adecuado plan de trabajo y terapéutico para su paciente.

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Amanzo, Lopez Cesar Francisco, Dias Luis Fernando Oscar Carlos Arrieta, Portilla Alexander Dany Ascarruz, and Vitorino Jose Luis Aymar. "Práctica Médica Sist. Circulatorio y Respiratorio - ME146 201701." Universidad Peruana de Ciencias Aplicadas (UPC), 2017. http://hdl.handle.net/10757/627391.

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Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico dirigido a los estudiantes del 3er ciclo que busca desarrollar la competencia general de comunicación oral (nivel 1) y las competencias específicas de práctica clínica-diagnóstico (nivel 1) y profesionalismo-sentido ético y legal y responsabilidad profesional (nivel 1), a través de la elaboración, documentación y presentación de una historia clínica de un paciente con problema respiratorio y/o circulatorio. El estudiante al establecer una buena relación con el paciente y/o familiar obtiene la anamnesis, que es una entrevista dirigida al problema de salud que presenta el paciente, realiza el examen físico e integra los conocimientos que le servirán para establecer un diagnostico por síndromes o problemas. La elaboración de una historia clínica orientada por problemas le permitirán al estudiante, tanto en los años superiores como en su vida profesional plantear un adecuado plan de trabajo y terapéutico que curará o aliviará a su paciente.

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Aplicadas, Universidad Peruana de Ciencias. "Práctica Médica Sist. Circulatorio y Respiratorio - ME146 201900." Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/627393.

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Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico del ciclo 3, en el que los estudiantes al establecer una buena relación con el paciente y/o familiar realizan la anamnesis, que es una entrevista dirigida al problema de salud que presenta el paciente, realizan el examen físico e integran conocimientos que servirán para establecer un diagnostico por síndromes o problemas circulatorio y respiratorio. El curso de Práctica Médica Sistema Circulatorio y respiratorio busca desarrollar la competencia general de comunicación oral (nivel 1) y las competencias específicas de práctica clínica-diagnóstico (nivel 1) y profesionalismo-sentido ético y legal y responsabilidad profesional (nivel 1). La elaboración de una historia clínica orientada por problemas permitirá al estudiante en el futuro, plantear un adecuado plan de trabajo y terapéutico para su paciente.

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Aplicadas, Universidad Peruana de Ciencias. "Práctica Médica Sist. Circulatorio y Respiratorio - ME146 201800." Universidad Peruana de Ciencias Aplicadas (UPC), 2018. http://hdl.handle.net/10757/627392.

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Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico del ciclo 3, en el que los estudiantes al establecer una buena relación con el paciente y/o familiar realizan la anamnesis, que es una entrevista dirigida al problema de salud que presenta el paciente, realizan el examen físico e integran conocimientos que servirán para establecer un diagnostico por síndromes o problemas circulatorio y respiratorio. El curso de Práctica Médica Sistema Circulatorio y respiratorio busca desarrollar la competencia específica de práctica clínica-diagnóstico (nivel 1) y profesionalismo-sentido ético y legal y responsabilidad profesional (nivel 1). La elaboración de una historia clínica orientada por problemas permitirá al estudiante en el futuro, plantear un adecuado plan de trabajo y terapéutico para su paciente.

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Ascarruz, Portilla Alexander Dany, La Cruz Larru Maria Teresa De, Vega Arturo Gabriel Jurado, and Leon Maria Esperanza Mesta. "Práctica Médica Sist. Circulatorio y Respiratorio - ME146 201901." Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/627757.

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Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico del ciclo 3, en el que los estudiantes al establecer una buena relación con el paciente y/o familiar realizan la anamnesis, que es una entrevista dirigida al problema de salud que presenta el paciente, realizan el examen físico e integran conocimientos que servirán para establecer un diagnostico por síndromes o problemas circulatorio y respiratorio. El curso de Práctica Médica Sistema Circulatorio y respiratorio busca desarrollar la competencia general de comunicación oral ( nivel 1) y las competencias específicas de práctica clínica-diagnóstico (nivel 1) y profesionalismo-sentido ético y legal y responsabilidad profesional (nivel 1). La elaboración de una historia clínica orientada por problemas permitirá al estudiante en el futuro, plantear un adecuado plan de trabajo y terapéutico para su paciente.

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Ascarruz, Portilla Alexander Dany, Vitorino Jose Luis Aymar, Brandt Roman Barreto, and Castellanos Maria Georgina Ceferino. "Práctica Médica Sist. Nervioso y Tegumentario - ME139 201702." Universidad Peruana de Ciencias Aplicadas (UPC), 2017. http://hdl.handle.net/10757/627838.

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Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico del ciclo 2 en el que los estudiantes al establecer una buena relación con el paciente y/o familiar realizan la anamnesis, que es una entrevista dirigida al problema de salud que presenta el paciente, realizan el examen físico e integra conocimientos que servirán para establecer un diagnostico por síndromes o problemas del sistema nerviosos y tegumentario. El curso de Práctica Médica Sistema Nervioso y tegumentario busca desarrollar la competencia general de ciudadanía (nivel 1) y las competencias específicas de práctica clínica-diagnóstico (nivel 1) y profesionalismosentido ético y legal y responsabilidad profesional(nivel 1), tiene el prerrequisito del curso de Fundamentos de la Salud. La elaboración de una historia clínica orientada por problemas permitirá al estudiante, plantear un adecuado plan de trabajo y terapéutico para su paciente.

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De, La Cruz Larru Maria Teresa, Chinarro Juan Felix Pun, and Caldas Eva Maria Salinas. "Práctica Médica Sist. Nervioso y Tegumentario - ME139 201900." Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/627836.

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Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico del ciclo 2, en el que los estudiantes al establecer una buena relación con el paciente y/o familiar realizan la anamnesis, que es una entrevista dirigida al problema de salud que presenta el paciente, realizan el examen físico e integran conocimientos que servirán para establecer el diagnostico por síndromes o problemas del sistema nervioso y tegumentario. El curso de Práctica Médica Sistema Nervioso y tegumentario busca desarrollar la competencia general de ciudadanía (nivel 1) y las competencias específicas de práctica clínica-diagnóstico (nivel 1) y profesionalismosentido ético y legal y responsabilidad profesional (nivel 1). La elaboración de una historia clínica orientada por problemas permitirá al estudiante en el futuro, plantear un adecuado plan de trabajo y terapéutico para su paciente.

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Aplicadas, Universidad Peruana de Ciencias. "Práctica Médica Sist. Nervioso y Tegumentario - ME139 201800." Universidad Peruana de Ciencias Aplicadas (UPC), 2018. http://hdl.handle.net/10757/627840.

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Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico del ciclo 2, en el que los estudiantes al establecer una buena relación con el paciente y/o familiar realizan la anamnesis, que es una entrevista dirigida al problema de salud que presenta el paciente, realizan el examen físico e integran conocimientos que servirán para establecer un diagnostico por síndromes o problemas del sistema nerviosos y tegumentario. El curso de Práctica Médica Sistema Nervioso y tegumentario busca desarrollar las competencias específicas de práctica clínica-diagnóstico (nivel 1) y profesionalismo-sentido ético y legal y responsabilidad profesional(nivel 1). La elaboración de una historia clínica orientada por problemas permitirá al estudiante en el futuro, plantear un adecuado plan de trabajo y terapéutico para su paciente.

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Ceferino, Castellanos Maria Georgina, La Cruz Larru Maria Teresa De, Espinoza Gregoria Eguizabal, and Vega Luz Haydee Huapaya. "Práctica Médica Sist. Nervioso y Tegumentario - ME139 201802." Universidad Peruana de Ciencias Aplicadas (UPC), 2018. http://hdl.handle.net/10757/627841.

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Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico del ciclo 2, en el que los estudiantes al establecer una buena relación con el paciente y/o familiar realizan la anamnesis, que es una entrevista dirigida al problema de salud que presenta el paciente, realizan el examen físico e integran conocimientos que servirán para establecer el diagnostico por síndromes o problemas del sistema nervioso y tegumentario. El curso de Práctica Médica Sistema Nervioso y tegumentario busca desarrollar la competencia general de ciudadanía (nivel 1) y las competencias específicas de práctica clínica-diagnóstico (nivel 1) y profesionalismosentido ético y legal y responsabilidad profesional (nivel 1). La elaboración de una historia clínica orientada por problemas permitirá al estudiante en el futuro, plantear un adecuado plan de trabajo y terapéutico para su paciente.

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Amanzo, Lopez Cesar Francisco, Dias Luis Fernando Oscar Carlos Arrieta, Portilla Alexander Dany Ascarruz, and Vitorino Jose Luis Aymar. "Práctica Médica Sist. Nervioso y Tegumentario - ME139 201602." Universidad Peruana de Ciencias Aplicadas (UPC), 2016. http://hdl.handle.net/10757/627835.

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Curso de la especialidad, de la carrera de medicina ,de carácter teórico- práctico dirigido a los estudiantes del 2do ciclo que busca desarrollar la competencia general de ciudadanía( nivel 1) y las competencias específicas de práctica clínica-diagnóstico( nivel 1) y profesionalismo-sentido ético y legal y responsabilidad profesional( nivel 1) ,a través de la elaboración, documentación y presentación de una historia clínica de un paciente con un problema del sistema nervioso o tegumentario, estableciendo una buena relación con el paciente y/o familiar obtiene la anamnesis ,que es una entrevista dirigida al problema de salud que presenta el paciente , realiza el examen físico e integra los conocimientos que le servirán para establecer un diagnostico sindrómico o por problemas. La elaboración de una historia clínica orientada por problemas le permitirán al estudiante, tanto en los años superiores como en su vida profesional plantear un adecuado plan de trabajo y terapéutico que curará o aliviará a su paciente.

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Ascarruz, Portilla Alexander Dany, Vitorino Jose Luis Aymar, Castellanos Maria Georgina Ceferino, and La Cruz Larru Maria Teresa De. "Práctica Médica Sist. Nervioso y Tegumentario - ME139 201700." Universidad Peruana de Ciencias Aplicadas (UPC), 2017. http://hdl.handle.net/10757/627839.

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Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico dirigido a los estudiantes del 2do ciclo que busca desarrollar la competencia general de ciudadanía (nivel 1) y las competencias específicas de práctica clínica-diagnóstico (nivel 1) y profesionalismo-sentido ético y legal y responsabilidad profesional (nivel 1), a través de la elaboración, documentación y presentación de una historia clínica de un paciente con problema nervioso y tegumentario. El estudiante al establecer una buena relación con el paciente y/o familiar obtiene la anamnesis, que es una entrevista dirigida al problema de salud que presenta el paciente, realiza el examen físico e integra los conocimientos que le servirán para establecer un diagnostico por síndromes o problemas. La elaboración de una historia clínica orientada por problemas le permitirán al estudiante, tanto en los años superiores como en su vida profesional plantear un adecuado plan de trabajo y terapéutico que curará o aliviará a su paciente.

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Aymar, Vitorino Jose Luis, La Cruz Larru Maria Teresa De, Espinoza Gregoria Eguizabal, and Huerta Margarita Maria Maldonado. "Práctica Médica Sist. Nervioso y Tegumentario - ME139 201901." Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/627837.

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Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico del ciclo 2, en el que los estudiantes al establecer una buena relación con el paciente y/o familiar realizan la anamnesis, que es una entrevista dirigida al problema de salud que presenta el paciente, realizan el examen físico e integran conocimientos que servirán para establecer el diagnostico por síndromes o problemas del sistema nervioso y tegumentario. El curso de Práctica Médica Sistema Nervioso y tegumentario busca desarrollar la competencia general de ciudadanía (nivel 1) y las competencias específicas de práctica clínica-diagnóstico (nivel 1) y profesionalismosentido ético y legal y responsabilidad profesional (nivel 1). La elaboración de una historia clínica orientada por problemas permitirá al estudiante en el futuro, plantear un adecuado plan de trabajo y terapéutico para su paciente.

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48

Wu, YanHao. "SIP-based location service provision." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&amp.

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Location-based service (LBS) is a geographical location-related service that provides highly personalized services for users. It is a platform for network operators to provide new and innovative ways of increasing profits from new services. With the rapidly growing trend toward LBS, there is a need for standard LBS protocols. This thesis started with introducing the Internet Engineering Task Force GEOPRIV working group, which endeavors to provide standard LBS protocols capable of transferring geographic location information for diverse location-aware applications. Through careful observation, it was found that Session Initiation Protocol (SIP) is well suited to the GEOPRIV requirements. The aim of this research was therefore to explore the possibility of the integration of LBS and the SIP protocol and, to some extent fulfill the GEOPRIV requirements.

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Wu, Xiao. "SIP on an Overlay Network." Thesis, KTH, Kommunikationssystem, CoS, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91491.

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With the development of mobile (specifically: wide area cellular telephony) technology, users’ requirements have changed from the basic voice service based on circuit switch technology to a desire for high speed packet based data transmission services. Voice over IP (VoIP), a packet based service, is gaining increasing attention due to its high performance and low cost. However, VoIP does not work well in every situation. Today Network address translation (NAT) traversal has become the main obstruction for future VoIP deployment. In this thesis we analyze and compare the existing NAT traversal solutions. Following this, we introduce a VoIP over IPSec (VOIPSec) solution (i.e., a VoIP over IPSec virtual private network (VPN) scheme) and an extended VOIPSec solution mechanism. These two solutions were tested and compared to measure their performance in comparison to a version of the same Session Initiation Protocol (SIP) user agent running without IPSec. In the proposed VOIPSec solution, the IPSec VPN tunnel connects each of the SIP clients to a SIP server, thus making all of the potential SIP participants reachable, i.e., solving the NAT traversal problem. All SIP signaling and media traffic for VoIP calls are transmitted through this prior established tunnel. This VPN tunnel provides the desired universal means for VoIP traffic to traverse NAT equipment. Additionally, the IPSec VPN also guarantees the security of VoIP calls at the IP level. In order to improve the security level of media streams for the VOIPSec solution, we deployed and evaluated an extended VOIPSec solution which provides end-to-end protection of the real time media traffic. In this extended VOIPSec solution, we used SRTP instead of RTP to carry the media content. This extended method was shown to provide all of the advantages of VOIPSec and SRTP without any additional delay for the media traffic (as compared to the VoIPSec solution). Note that the solution proposed in this thesis may be of limited practical importance in the future as more NATs become VoIP capable; but the solution is currently essential for facilitating the increasing deployment of VoIP systems in practice. For VoIP calls that do not need end-to-end security, we recommend the use of the VOIPSec solution as a means to solve the NAT traversal problem and to protect traffic at the IP level. When application to application security is not needed we prefer the VOIPSec solution to the extended VOIPSec solution for the following reasons: (1) our test results show that the time for call setup for the extended VOIPSec solution is twice time the time needed for the VOIPSec solution and the extended VOIPSec solution requires the use of user agents that support SRTP. While, the VOIPSec solution does not require a special user agent and all VoIP clients in the market are compatible with this solution. However, when more SIP user agents add support for SRTP, the extended VOIPSec solution will be applicable for users of these SIP user agents.
Med utvecklingen av mobil (specifikt: wide area cellulär telefoni)-teknik, har användarnas krav ändras från den grundläggande röst-tjänst som bygger på krets kopplad teknik till att vilja ha hög-hastighets paket baserade dataöverföringstjänster. Voice over IP (VoIP) som vinner allt mer uppmärksamhet på grund av sin höga prestanda och låga kostnader är en paket baserad telefon tjänst. Däremot fungerar VoIP inte bra i alla situationer. Network address translation (NAT) har blivit det största hinder för en framtida användning av VoIP. I denna avhandling analyserar vi och jämför nuvarande NAT lösningar. Efter detta inför vi en VoIP över IPSec (VOIPSec) lösning (dvs. ett VoIP över IPSec Virtual Private Network (VPN) system) och en utvidgad VOIPSec lösnings mekanism. Dessa två lösningar testas och jämfördes för att mäta prestationer i förhållande till en version av samma SIP User Agent som körs utan IPSec. I den föreslagna lösningen VOIPSec ansluter IPSec en VPN-tunnel till varje SIP-klient och SIP-server, vilket gör att alla de potentiella SIP deltagarna kan nås, dvs eventuella NAT problem löses. All SIP-signalering och media trafik för VoIP-samtal överförs via denna etablerade tunnel. Denna VPN-tunnel ger allmänna medel för VoIP-trafik att passera NAT utrustningen. Dessutom ger IPSec VPN också garanterad säkerheten för VoIP-samtal på IP-nivå. För att förbättra skyddsnivån för mediaströmmar med VOIPSec, skapade vi och utvärderade en utsträckt VOIPSec lösning som innehåller end-to-end skydd av realtids media trafik. I denna utökade VOIPSec lösning, använde vi SRTP stället för RTP för att bära medieinnehåll. Denna utvidgade metod visade sig ge alla fördelar VOIPSec och SRTP kunde erbjuda utan ytterligare dröjsmål för media trafiken (jämfört med VoIPSec lösningen). Observera att den lösning som föreslås i denna avhandling kan vara av begränsad praktisk betydelse i framtiden då fler NAT lösningar blir VoIP kapabla, men lösningen är idag nödvändigt för att underlätta den ökande användningen av VoIP-system i praktiken. För VoIP-samtal som inte behöver end to end säkerhet rekommenderar vi användning av VOIPSec lösningen som ett sätt att lösa NAT problem och för att skydda trafiken på IP-nivå. När end to end säkerhet inte behövs föredrar vi VOIPSec lösningen av följande skäl: (1) våra testresultat visar att tiden för samtal inställning för det förlängda VOIPSec lösningen är dubbelt den tid som krävs för VOIPSec lösningen och den utökade VOIPSec lösningen kräver användning av användarprogram som stödjer SRTP. Medan VOIPSec lösningen inte kräver en speciell användar agent och alla VoIP-klienter på marknaden är kompatibla med denna lösning. Men när fler SIP användaragenter får stöd för SRTP, kommer den förlängda VOIPSec lösning tillämpas för användare av dessa SIP användarprogram.

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50

Mahmood, Faisal. "SIP Security Threats and Countermeasures." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-18126.

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Abstract:

With the emergence of multimedia applications and the upcoming age of Voice over IP (VoIP), Voice setup and resources control protocols such as SIP and H.323 over the Internet are becoming increasingly attractive applications. In the last few years as a real competitor in traditional telephony services (PSTN), SIP has gained much attention when compared with H.323. SIP works at presentation and application layer thus it mainly faces security issue at these layers. The objective of this thesis is to describe the most relevant SIP related security issues and then present security mechanisms that can be deployed to overcome the SIP security related issues. This project work demonstrates the tasks necessary to enhance the SIP security both inside and outside of the network. It is divided into three main parts, where the first part describes the SIP architecture, for example, the SIP rivals, SIP components and how a SIP system works. The second part is about some vulnerability issues of concern to SIP, study of the proposed security mechanism and also analysis on how possible threats to the SIP system such as call hijacking, message tempering and DoS attack, affect the SIP based VoIP system. The third and final part describes different steps that have been taken to avoid SIP attacks, by implementing some of the proposed security mechanisms. In order to test the SIP security, a SIP model is designed, which based on security mechanisms such as firewall, IPSec, DMZ and SIP-TLS. The results are conducted into two different scenarios. In the 1st scenario, the SIP system is tested before implementing the security measurements. In this case, the insecure system was vulnerable to several SIP attacks such as call hijacking, DOS and message tampering. In the 2nd scenario, the system is tested after the implementation of the proposed security mechanisms, where by the system now is only accessible to the authorized users and services. The tested results are also compared and discussed at the end.

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Dissertations / Theses on the topic 'SISP'

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