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Web services paradigm is allowing applications to interact with one another over the Internet. BPEL facilitates this interaction by providing a platform through which Web services can be integrated. However, the autonomous and distributed nature of the integrated services presents unique challenges to the reliability of composed services. The focus of our ongoing research is to transparently introduce...
Smart environments and mobile computing systems increasingly converge, resulting in the emergence of pervasive computing environments. This development brings up new challenges that pertain to the variable availability and different mobility of heterogeneous services. Existing service interaction patterns in the area of service-oriented architecture (SOA) do not sufficiently address the changed requirements...
Service matchmaking is a basic feature of service-oriented architecture (SOA). In this paper, a semantic-based flexible service matchmaking approach is presented to efficiently identifying functionality-compatible services. This approach utilizes SAW-OWL-S to specify the service advertisements and service discovery requests. The functionality-compatibility of a service to a request is defined on their...
Communication based train control (CBTC) system was based on mobile communication and overcome fixed blocks in order to increase track utilization and train safety. As an intelligent autonomous decentralized systems (IADS), data communication system (DCS) between trains and zone center (ZC) are crucial factors for the safe and efficient operation of CBTC system. The real-time behavior under various...
In mobile ad hoc networks, routing schemes using location information have been proposed. Most of these schemes assume that the source node already knows the location information of the destination node. However, since all nodes are always moving, it is difficult to apply this assumption to the real mobile ad hoc environment. In order to cope this difficulty, this paper presents a new routing scheme...
Wireless sensor networks generally have three objects: sensors generating data, sinks gathering the data, and users that send queries and receive data via the sinks. In addition, the user and the sinks are mostly connected to each other by infrastructure networks. The users, however, should receive the data from the sinks through multi-hop communications between disseminated sensor nodes if such users...
Grid technologies have enabled the clustering of a wide variety of geographically distributed resources and services. While providing this, the grid middleware layers that make up the supporting platform for grid applications have taken an increased level of importance in the overall performance of such distributed applications. In this paper we discuss the necessity of introducing self-managing capabilities...
The following topics are dealt with: autonomous decentralized systems; service composition; service collaboration; testing and online validation; transportation; sensor and ad hoc networks; assurance and fault-tolerance; agent systems and networking; resource abstraction and management; security, safety, and trust; automotive telematics; multimedia content and service provisioning; context-awareness;...
In ad hoc networks, wireless links can be unidirectional due to the difference of transmission range of each node. Particularly for temporally formed ad hoc networks, routing protocols should support route construction using unidirectional links to provide high connectivity in various network configurations. Although existing DSR have a mode of two way flooding to support route construction using...
It is difficult to acquire quantitative performance evaluation result of servo control system with high precision and complex indexes, so the fuzzy analytic hierarchy process (F-AHP) is applied to quantitatively evaluate the performance of servo control system. Firstly the evaluation model with multi layers and indexes are founded, then the evaluation principle based on F-AHP is researched which is...
Safety and reliability cannot be tested into technical software systems on embedded control units after their development. Preventive actions have to be taken in respect of safety and reliability. An automatic and tool supported check of custom rules, industry standards and enterprise wide guidelines can support the quality assurance process. In the domain of automotive software engineering there...
The domain name system (DNS) is a critical infrastructural component of Internet, since it constitutes the essential first link in the entire chain of Internet connectivity. Enriching DNS functionality with in-network decision making capabilities can enable DNS to protect effectively both itself and the Internet, minimizing simultaneously human intervention. Decision making builds on the concept of...
Identifying correlations between context data, user behavior, and semantic information can lead to new services that are able to adapt to different situations. This "personalization" process can be based on recommendations on content. To better support service developers in focusing mainly on the creation of their service logic, these recommendations should be provided by a generic multipurpose...
Currently there is a strong discussion throughout the industry and all relevant standard development organizations (SDO) like the ITU-T and ETSI TISPAN how next generation IPTV services could incorporate with the developments from the TISPAN NGN Release 2 architecture. Several approaches have already been introduced struggling with the need for an integrated solution with the core IMS network or the...
The design for an asynchronous messaging platform is proposed as an aid in developing context-aware services in a network environment having a ubiquitous presence of information publishers that actively issue information and information holders that provide information on request. Context-aware services use the result of analyzing context based on multiple sources of information as an execution trigger...
In this paper, we propose a general decomposition and coordination method for timed Petri nets to determine an optimal transition firing sequence to minimize an objective function. A timed Petri net model for multiple entities is decomposed into several subnets in which the optimal firing sequence for each subnet is easily solved in polynomial computational complexity. The solution of each subproblem...
In order to make routing efficient for large-scaled ad hoc networks, we have proposed the autonomous clustering scheme and the hierarchical routing called Hi-AODV based on the autonomous clustering. Since, in the current autonomous clustering, a tree rooted at a clusterhead which manages a cluster is constructed for each cluster, data and control packets always pass through the clusterhead in the...
To facilitate flexible data discovery, sensor networks can be supported by query processing, where a query is injected into the sensor network from some base station. In his paper we consider the problem of query injection by base stations that are mobile (mobile objects) and individual sensors are "location-ignorant". The idea is to have mobile objects take advantage of each other's independent...
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