Simple Object Access Protocol と,その応用としてのソフトウェアの組み合わせについて (渡邉昭夫教授退任記念号)

being used in many other applications to explicitly declare the knowledge embedded in them. However, not only are ontologies useful for applications in which knowledge plays a key role, but they can also trigger a major change in current Web contents. This change is leading to the third generation of the Web—known as the Semantic Web—which has been defined as “the conceptual structuring of the Web in an explicit machine-readable way.”1 This definition does not differ too much from the one used for defining an ontology: “An ontology is an explicit, machinereadable specification of a shared conceptualization.”2 In fact, new ontology-based applications and knowledge architectures are developing for this new Web. A common claim for all of these approaches is the need for languages to represent the semantic information that this Web requires—solving the heterogeneous data exchange in this heterogeneous environment. Here, we don’t decide which language is best of the Semantic Web. Rather, our goal is to help developers find the most suitable language for their representation needs.

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Ontology languages for the Semantic Web

Proceedings of the World Congress on Engineering 2013, WCE 2013

Several research groups are working on designing new security architectures for 4G networks such as Hokey and Y-Comm. Since designing an efficient security module requires a clear identification of potential threats, this paper attempts to outline the security challenges in 4G networks. A good way to achieve this is by investigating the possibility of extending current security mechanisms to 4G networks. Therefore, this paper uses the X.805 standard to investigate the possibility of implementing the 3G’s Authentication and Key Agreement (AKA) protocol in a 4G communication framework such as YComm. The results show that due to the fact that 4G is an open, heterogeneous and IP-based environment, it will suffer from new security threats as well as inherent ones. In order to address these threats without affecting 4G dynamics, Y-Comm proposes an integrated security module to protect data and security models to target security on different entities and hence protecting not only the data but, also resources, servers and users.

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Providing Security in 4G Systems: Unveiling the Challenges

Recently, numerous real-time, data-rich, and differentiated applications and services have appeared in the next-generation Heterogeneous Networks. As a result, the number of potentially “untrusted” connections to the mobile operator’s core network is expected to dramatically increase. Therefore, the operators must provide adequate security, without significantly affecting the quality of service (QoS). Hence, joint consideration of QoS and security is a critical research issue. However, due to their difficult-to-model conflicting objectives, existing research works have often dealt with them separately. In this paper, we address this problem, formally formulate it, and envision GT-QoSec, a game-theoretic joint optimization of QoS and security. Using GT-QoSec, the mobile user equipment (UE) and their servicing base stations (eNBs) play games with each other. Thus, the UE obtains a balanced set of QoS and security levels while the eNBs maximize their bandwidth utilization. Extensive analysis and simulation results are presented to evaluate the performance of GT-QoSec in contrast with several conventional methods.

GT-QoSec: A Game-Theoretic Joint Optimization of QoS and Security for Differentiated Services in Next Generation Heterogeneous Networks

The Next Generation Internet will provide ubiquitous computing by the seamless operation of heterogeneous wireless networks. It will also provide support for quality-ofservice, QoS, fostering new classes of applications and will have a built-in multi-level security environment. A key requirement of this new infrastructure will be support for efficient vertical handover. Y-Comm is a new architecture that will meet the challenge of this new environment. This paper explores the design of efficient imperative handover mechanisms using the Y-Comm Framework. It first looks at different types of handovers, then examines the Y-Comm Framework and shows how Y-Comm maps unto current mobile infrastructure. It then explores support for different handover mechanisms using Y-Comm. Finally, it highlights the development of a new testbed to further investigate the proposed mechanisms.

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Exploring Efficient Imperative Handover Mechanisms for Heterogeneous Wireless Networks

In order for next generation networks to support effective handover procedures, there is a need for defining QoS signaling mechanisms that guarantee the provision of point- to- point as well as network level QoS. This paper proposes a QoS signaling mechanism to be implemented by the Y-Comm architecture as a potential 4G framework. The proposed mechanism requires certain level of cooperation among network elements; therefore, it proposes some functional modules/ interfaces to be run on different network entities. As showed in the paper, the proposed mechanism could be implemented in different scenarios such as initial registration and connection, and also in the case of handover.

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A QoS framework for heterogeneous networking

Users in ubiquitous and pervasive computing environments will be much more empowered in ways to access and to control their navigation. Handover, the vital event in which a user changes the attachment point in a next generation network (NGN), is an important occasion and the conditions and environment in which it is executed can offer relevant information for businesses. This paper describes the capabilities of a platform which intends to exploit contextual handover information offering a rich environment that can be used by access and content providers for building innovative context-aware multi-provided services. Based on ontologies, the technique not only eases the building of versatile services but also provides a comprehensive source of information both for enriching user navigation in the network as well as for the improvement of the provider's relationship with their customers.

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Exploiting contextual handover information for versatile services in NGN environments

An increasingly wireless world will mean that devices with multiple network interfaces will soon become commonplace Users will expect to be always connected from anywhere and at any time as connections will be switched to available networks using handover techniques However, different networks have different Qualities-of-Service so a Quality-of-Service Framework is needed to help applications and services deal with this new environment In addition, since these networks must work together, future mobile systems will have an open, instead of the currently closed, architecture Therefore new mechanisms will be needed to protect users, servers and network infrastructure This means that future mobile networks will have to integrate communications, mobility, quality-of service and security This paper provides an overview of potential architectures for communication in future networks Our study shows that only a number of these architectures support this integration

/pdf/a-survey-of-potential-architectures-for-communication-in-1z55get408.pdf

A survey of potential architectures for communication in heterogeneous networks

As Vehicle Ad Hoc Networks (VANETs) become a key component of Intelligent Transportation System (ITS), trust is important in applications that besides traditional security requirements need to evaluate the behavior of different entities in VANETs. Highly dynamic environments of vehicles need an adapted form of trust establishment. There are efforts for evaluating trust in VANETs, based on reputation mechanisms. In this paper, we propose a definition of the reputation relying on the use of an ontology of VANETs, ensuring both an optimal coverage of the domain and a deep semantic rooting. This definition is based on the identification of the key aspects requiring the support of the ontology for their evaluation. Keywordstrust; ontology; VANETs; reputation model

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Renata Maria Porto Vanni

Papers

Exploring Efficient Imperative Handover Mechanisms for Heterogeneous Wireless Networks

A QoS framework for heterogeneous networking

Exploiting contextual handover information for versatile services in NGN environments

A survey of potential architectures for communication in heterogeneous networks

Ontology driven reputation model for VANET