An entity access control model for network services management

The Network Services Management Framework tries to overcome the most important limitations of present network management frameworks, namely the most widely supported framework – the Internet Network Management Framework – by defining a management framework using a network services management distributed architecture that provides services management functions with any desired level of functionality. This document introduces one of the most important parts of this framework, the Entity Access Control Model and the mechanisms needed to its deployment: management entities and management domains, entity access and resources control management, and security mechanisms (authentication, data integrity verification, confidentiality and non-repudiation assurances). This model, although originally developed to be integrated on the Network Services Management Framework, can be completely integrated or partially adopted by other frameworks since it supports a wide range of conceptual and functional requisites recognised to be fundamental to the future of modern distributed network management frameworks

Enabling seamless V2I communications towards developing cooperative automotive applications in VANET systems

Cooperative applications for VANET will require seamless communication between Vehicle to Infrastructure and Vehicle to Vehicle. IEEE 802.11p has been developed to facilitate this effort. However, in order to have seamless communication for these applications, it is necessary to look at handover as vehicles move between Road-side Units. Traditional models of handover used in normal mobile environments are unable to cope with the high velocity of the vehicle and the relatively small area of coverage with regard to vehicular environments. The YComm framework has yielded techniques to calculate the Time Before Vertical Handover and the Network Dwell Time for any given network topology. Furthermore, by knowing these two parameters, it is also possible to improve channel allocation and resource management in network infrastructure such as base-stations, relays, etc. In this article we explain our overall approach by describing the VANET Testbed and show that in Vehicular environments it is necessary to consider a new handover model which is based on a probabilistic rather than a fixed coverage approach. Finally, we show a new performance model for proactive handover which is then compared with traditional approaches

Enabling seamless V2I communications towards developing cooperative automotive applications in VANET systems

Cooperative applications for VANET will require seamless communication between Vehicle to Infrastructure and Vehicle to Vehicle. IEEE 802.11p has been developed to facilitate this effort. However, in order to have seamless communication for these applications, it is necessary to look at handover as vehicles move between Road-side Units. Traditional models of handover used in normal mobile environments are unable to cope with the high velocity of the vehicle and the relatively small area of coverage with regard to vehicular environments. The YComm framework has yielded techniques to calculate the Time Before Vertical Handover and the Network Dwell Time for any given network topology. Furthermore, by knowing these two parameters, it is also possible to improve channel allocation and resource management in network infrastructure such as base-stations, relays, etc. In this article we explain our overall approach by describing the VANET Testbed and show that in Vehicular environments it is necessary to consider a new handover model which is based on a probabilistic rather than a fixed coverage approach. Finally, we show a new performance model for proactive handover which is then compared with traditional approaches

Evaluation of computer networks with administrative structure at Islamic Azad University

The purpose of this study is to evaluate and compare the dependency between administrative structure and design and implementation of computer networks in Islamic Azad University. So, a collection of data shows the administrative structure and network administration is needed. The major of the proposed hypotheses is that there is a significant relationship between administrative structure variables, computer network administration and distributing variables. In this study, more than 150 questionnaires have been distributed among the participants. 100 questionnaires were answered, and then the required information test hypotheses were extracted. For testing the research hypotheses, chi-square test displayed the relationship between variables. Correlation coefficients were positive and in order to evaluate the reliability of questionnaire, Cronbach's alpha test was used. The results of examination of the relationship between variables showed that there is a meaningful relationship among all variables. Thus, all the proposed hypotheses were proved

Evaluation of computer networks with administrative structure at Islamic Azad University

The purpose of this study is to evaluate and compare the dependency between administrative structure and design and implementation of computer networks in Islamic Azad University. So, a collection of data shows the administrative structure and network administration is needed. The major of the proposed hypotheses is that there is a significant relationship between administrative structure variables, computer network administration and distributing variables. In this study, more than 150 questionnaires have been distributed among the participants. 100 questionnaires were answered, and then the required information test hypotheses were extracted. For testing the research hypotheses, chi-square test displayed the relationship between variables. Correlation coefficients were positive and in order to evaluate the reliability of questionnaire, Cronbach's alpha test was used. The results of examination of the relationship between variables showed that there is a meaningful relationship among all variables. Thus, all the proposed hypotheses were proved

Evaluation of computer networks with administrative structure at Islamic Azad University

The purpose of this study is to evaluate and compare the dependency between administrative structure and design and implementation of computer networks in Islamic Azad University. So, a collection of data shows the administrative structure and network administration is needed. The major of the proposed hypotheses is that there is a significant relationship between administrative structure variables, computer network administration and distributing variables. In this study, more than 150 questionnaires have been distributed among the participants. 100 questionnaires were answered, and then the required information test hypotheses were extracted. For testing the research hypotheses, chi-square test displayed the relationship between variables. Correlation coefficients were positive and in order to evaluate the reliability of questionnaire, Cronbach's alpha test was used. The results of examination of the relationship between variables showed that there is a meaningful relationship among all variables. Thus, all the proposed hypotheses were proved

IT/IS governance in hospital context: Differences between public and private sector and their position regarding IT/IS governance frameworks

Tecnologias de Informação (TI) são essenciais para o bom funcionamento de um hospital. Agilizam processos de partilha de informação, contribuindo para a melhoria da qualidade dos cuidados de saúde, bem como torna mais eficiente os variados processos dentro destas organizações. Esta crescente importância das TI reforça a necessidade de garantir que o uso destas tecnologias está bem alinhado com a estratégia e objetivos da organização. Surge, assim o conceito de governação das TI. Esta governação permite maximizar o retorno de investimentos feitos em TI, bem como aumentar a flexibilidade de adaptação à mudança, mitigar riscos externos e melhorar a sua performance. Existem diversas frameworks que abordam este tema, nomeadamente o COBIT. A implementação de uma estrutura de governação de TI varia consoante a organização, o setor e o regime estatutário. Por isso, estruturou-se uma entrevista para realizar aos Diretores de TI de hospitais públicos e privados e averiguar que diferenças existem na abordagem ao tema da governação das tecnologias de informação, bem como a perspetiva dos mesmos face à utilização de frameworks para este propósito. Verificou-se que nas organizações privadas existe um maior envolvimento dos gestores intermédios nas tomadas de decisão, bem como maior investimento em inovação e planeamento estratégico de longo prazo. Ao contrário do esperado no início do estudo, as organizações públicas foram as que mais demonstraram interesse em utilizar as frameworks, apesar da sua complexidade. Conclui-se que apesar de o regime estatutário influenciar o modelo de governação das TI, o fator determinante é quem está na liderança.Information Technology (IT) is increasingly essential for the proper functioning of a hospital. It streamlines data sharing, contributing to the improvement of the quality of healthcare, as well as making the several processes in these organizations more efficient. The growing importance of IT reinforces the need to ensure that these technologies are aligned with the strategy and objectives of the organization. This has led to the rises of the IT/IS governance. Such governance allows the maximization of the return on IT investments, as well as increasing the organization flexibility to adapt to changes, mitigate risks and improve its performance. There are several frameworks that address this topic, namely COBIT. The implementation of an IT/IS governance structure depends on the organization, on the sector and on the statutory regime. Therefore, it was structured an interview to be carried out to the IT/IS Director s of public and private hospitals and find out what differences exist in the approach to this issue, as well as their thoughts about the use of frameworks for this purpose. The results show that private organizations there is greater involvement of middle managers in IT-related decision-making, as well as greater investment in innovation and long-term strategic planning. Contrary to what was expected at the beginning of the study, public organizations were the ones that showed that want to follow those frameworks, despite of their complexity. To conclude, although the statutory regime influences the IT/IS governance model, the determining factor is who is in the leadership