[Show abstract][Hide abstract] ABSTRACT: The semantic languages like Ontology Web Language, Web Services Modeling Language and Foundation for Intelligent Physical Agent Semantic Language, differ in syntax and semantic representation, result in mismatches that required mapping and interoperability for cross service utilisation among these semantic languages. In this paper, we compiled our work that is a middleware technique to make possible translation among heterogeneous contents on the bases of similar objectives that FIPA Ontology Service Specification provides to agent community. The paper addresses and motivates the relevant topic of achieving semantic interoperability among software agents and semantic web through the development of agent based middleware architecture. Semantic description languages used in our architecture are FIPA SL, W3C's OWL and WSML, in order to dynamically obtain the semantic interoperability in a heterogeneous and distributed environment. The results are evaluated for ontology mappings with traditional parsing technique and SPARQL query based approach.
[Show abstract][Hide abstract] ABSTRACT: Disaster management systems are complex applications due to their distributed and decentralized nature. Various components
execute in parallel with high need of coordination with each other. In such applications, interaction and communication issues
are difficult to model and implement. In this paper, we have proposed agent-based Earthquake Management System (EMS) which
is modeled and analyzed using formal approach. Traditionally, such systems undergo through various transformations starting
from requirement models and specification to analysis, design and implementation. A variety of formal approaches are available
to specify systems for analyzing their structure and behavior; however, there are certain limitations in using these techniques
due to their expressiveness and behavior requirements. We have adopted combination of Pi-calculus and Pi-ADL formal languages
to model EMS from analysis to design. The formal approach helps to enhance reliability and flexibility of the system by reducing
the redundant information. It reduces chances of errors by explicitly mentioning working flow of information. Additionally,
a prototype application is presented as proof of concept in EMS context. We have also evaluated our formal specification by
using ArchWare and ABC tools; also, comparison of prototype application with major existing techniques is highlighted.
No preview · Article · May 2010 · The Journal of Supercomputing
[Show abstract][Hide abstract] ABSTRACT: In the current information age, peoplepsilas lives are driven by the availability and utilization of services to get information anytime, anywhere, in any format, and on any device. For a nomadic user, information becomes useful if certain scales of autonomy and intelligence are present in the information systems. In this context lightweight multi agent systems (L-MAS) become a preferable choice for design and development of intelligent autonomous mobile information systems. In this paper we aim to propose a multi agent based system architecture to bring OWL based semantic Web services to nomadic users. We propose a design for smart nomadic client using, L-MAS, which interacts with a multi agent based mediator system to get access to the OWL based semantic Web services.
[Show abstract][Hide abstract] ABSTRACT: Bringing Interoperability among heterogeneous semantic information services developed for open environments is a great challenge. Software agents have been realized as pivotal technology to drive semantic Web and grid services ultimately leading to automation of e-Science, e-Health and e-Commerce applications. Ontologies play a vital role as source of semantic representation of Web services, grid services and agent services. Different ontology languages have been proposed for semantic representation of these technologies. OWL is W3C standard for description of services on web and grid while FIPA SL is used as semantic language in agents. Both semantic languages differ in terms, syntax and semantics. We proposed software agent driven system architecture i.e.middleware ontology service (MOS) which provide translation of ontologies between these two languages. At the end, we provide comparative study of MOS with previous developed system i.e. ontology gateway and describe its implementation and results.
[Show abstract][Hide abstract] ABSTRACT: Resource management is one of the vital aspects in 3G networks as it controls the system capacity to manage congestion. It becomes more complex when all subscribers have to communicate using shared spectrum of Universal Mobile Telecommunications System (UMTS) and require flexible, higher bandwidth services. A key issue in delivering wireless services is the problem of congestion which has an adverse impact on the quality of service (QoS). To cope with QoS, there is a need of intelligent RNC (radio network controller) at BS (base station), which cooperates to adapt and retrieve information to manage the resources intelligently and reliably in a consistent manner. The proposed intelligent RNC react autonomously keeping in view the service level agreement (SLA), network environmental changes and collaboration with each other to share their knowledge. Distant index based retrieval and adaptation algorithms are proposed in this paper to handle unpredictable scenarios. These RNCs, as a result, accept, reject or buffer a connection request to manage resources to meet QoS requirement as defined in SLA. The evaluation shows that system congestion for high priority subscribers is significantly reduced at the cost of low priority subscribers in real time.
[Show abstract][Hide abstract] ABSTRACT: Personalization, which has the ultimate goal of satisfying userpsilas requests, can be perceived in terms of QoS measurement. As one of the means for the success of semantics Web, many techniques have been effectively used in modeling and developing Web service personalization. However, most of these methodologies relied heavily on detailed implicit and explicit information supply by users during initial and subsequent interactions with the systems. We propose in this paper a novel approach using the supply chain management (SCM) technique in personalizing Web services as against the conventional notion of applying SCM only to product manufacturing. Our user-model based framework uses multi-agent system (MAS) components in taking requests from users and working towards their satisfaction including seeking for additional information outside the system as the need arises. Only basic stereotype information furnished by potential users at initial contact is required for personalization during subsequent interactions with the system. The system is adaptive and aimed at high quality autonomous information services where users are successfully presented preferred Web services with minimum information request.
[Show abstract][Hide abstract] ABSTRACT: Agents and grid computing are distinct standards each defined by its own specifications. Semantic grid aims at providing semantic annotations for grid entities, WSMO is a language for semantic markup of grid services and provide semantic layer over grid resources. On the other hand, agents are intelligent software entities that can act semantically for interoperation with other agents in MAS. FIPA provides standard for MAS where agents speak FIPA ACL as the communication language while FIPA SL is the semantic language. Both FIPA SL and WSMO differ in terms of syntax, semantics and implementation constraints, which prevents interoperability between agents and grid services. This research addresses the issue of interoperability between FIPA agents and grid services by proposing a communication framework for interoperation; SOA compliant FIPA ACL ontology is developed; that provides the necessary vocabulary that not only adheres to the FIPA specifications but is also used by grid services.
[Show abstract][Hide abstract] ABSTRACT: Earthquake is a natural phenomenon which has resisted the major efforts to tackle it. The major problems in earthquake management are inefficient communication, complex interaction as well as lack of coordination and prompt service delivery in advent of earthquake. Software agent based systems are more suitable alternative to the available technologies. In this paper, a formal approach is used in the designing and modeling of an agent-based earthquake management system using pi-calculus. Pi-calculus is justified for this work because of its capability to model concurrent and parallel systems. This approach facilitates in removing redundancy in information flow, low chances of errors in system development as well as understanding the execution paths for generating test cases. The services from the system are expected to be more reliable, autonomous, and adaptive in performing timely relief operations.
[Show abstract][Hide abstract] ABSTRACT: Efficient management of continuously increasing resources is a major challenging task in grid research community. Further, efficient scheduling - an integral part of the management process - requires proficient resource organization as evidenced in available literature in this research domain. Some potential resources to schedule a given job are not discovered because existing systems are based on syntactic resource matching. However they can partially fulfill the request by different degrees of match. Semantic metadata and ontologies are considered helpful in managing resources more effectively. In this paper we investigate and explore how grid resource management can benefit from semantic knowledge. We propose semantic-based grid resource management (S-GRM) system which utilizes semantic metadata to describe and discover both logical and physical resources .We also discussed a prototype implementation of our proposed architecture using ProActive grid middleware.
[Show abstract][Hide abstract] ABSTRACT: Wireless technology has become widely popular and an important means of communication. A key issue in delivering wireless services is the problem of congestion which has an adverse impact on the Quality of Service (QoS), especially timeliness. Although a lot of work has been done in the context of RRM (Radio Resource Management), the deliverance of quality service to the end user still remains a challenge. Therefore there is need for a system that provides real-time services to the users through high assurance. We propose an intelligent agent-based approach to guarantee a predefined Service Level Agreement (SLA) with heterogeneous user requirements for appropriate bandwidth allocation in QoS sensitive cellular networks. The proposed system architecture exploits Case Based Reasoning (CBR) technique to handle RRM process of congestion management. The system accomplishes predefined SLA through the use of Retrieval and Adaptation Algorithm based on CBR case library. The proposed intelligent agent architecture gives autonomy to Radio Network Controller (RNC) or Base Station (BS) in accepting, rejecting or buffering a connection request to manage system bandwidth. Instead of simply blocking the connection request as congestion hits the system, different buffering durations are allocated to diverse classes of users based on their SLA. This increases the opportunity of connection establishment and reduces the call blocking rate extensively in changing environment. We carry out simulation of the proposed system that verifies efficient performance for congestion handling. The results also show built-in dynamism of our system to cater for variety of SLA requirements.
No preview · Article · Sep 2008 · IEICE Transactions on Information and Systems
[Show abstract][Hide abstract] ABSTRACT: The virtual enterprises are models for distributed manufacturing where activities ranging from product design to actual production are carried out amongst geographically dispersed entities. Communication, collaboration and competition are some of the emerging issues in this form of production. To address these challenges in such distributed systems, we adopt the use of software agents, which are intelligent, collaborative, reactive and mobile entities. Although there is significant literature on implementation of virtual enterprises, there are fewer contributions that address flexibility and reliability of such systems. In this paper, we present formal model of agent-based supply chain management (SCM) in a virtual enterprise involved in product manufacturing. Our model is presented at different levels of abstraction and formalism. A decision tree is used to capture the logic of production planning based on the requirement specification. This is subsequently transformed to a declarative programming language for systempsilas instantiation. The pi-calculus notation is adopted for lower level modeling of the SCM. We propose a model which is useful for the development of flexible software systems and support of virtual enterprises and distributed production. Also, the proposed framework is formalized to enhance the reliability of system specifications.
[Show abstract][Hide abstract] ABSTRACT: Precise information of network topology is important for both network management and network analysis. In this paper we describe an efficient algorithm for discovering the multi-hop IP and MAC layer topology of the network. The proposed algorithm for subnet guessing probes hosts that have high probability of being active. Efficient probing mechanisms are also used to ensure fewer blockages from the devices. Our algorithm only needs SNMP to be configured only on routers, switches and network printers not the end nodes. We have implemented and tested the algorithm at NUST Institute of Information Technology, Pakistan and Communication technologies, Japan and it has accurately discovered the network topology.
[Show abstract][Hide abstract] ABSTRACT: The resource management in 3G systems with multi-nodes environment is a demanding task to provide flexible and higher bandwidth services. To cope multi-nodes environment heterogeneity, there is a need of intelligent RNC (radio network controller) at BS (base station), which cooperates to adapt and retrieve information to manage the resources intelligently and reliably in a consistent manner. Knowledge sharing for radio resource management, at cell level is a novel approach presented in this paper. The proposed architecture has induced the global effect through local information sharing to make reliable and consistent decisions. It provides efficient solutions for symmetric scenarios at different locations without replication of knowledge base. Our inference engine adapts the closest information retrieved from the knowledge repository efficiently through distant indexed values technique. Consequently, an autonomous and sociable RNC accepts, rejects or buffers a connection request to mange resources to meet QoS requirement as defined in service level agreement (SLA).
[Show abstract][Hide abstract] ABSTRACT: Strong mobility is the movement of code, data and execution state of distributed entities from one computational unit to another. General issues related to strong mobility are inefficiency and increased code overhead. Our main concern is to optimize strong mobility to improve performance and reliability. This paper proposes an architecture namely "strongly instrumented generic mobility architecture (SIGMA)" that significantly increases efficiency and thereby reduces code overheads. This helps to achieve reliability and fault tolerance. Java is the choice of implementation for the proposed architecture but it restricts access to the execution state of a thread. Therefore, achieving strong mobility in a way that software quality parameters like portability, efficiency and reliability are preserved becomes a challenging task. To achieve these parameters, the paper realizes the implementation of strong mobility using byte code instrumentation technique in the form of a generic plug-in named SIGMA. Performance evaluation of the proposed system shows significant efficiency improvement and reduced code overhead.
[Show abstract][Hide abstract] ABSTRACT: The supply chain plays a vital role in the procurement, delivery and manufacturing of raw materials as well as supply of finished products in a network of business processes. The major challenges facing the system are efficient coordination and prompt production planning in meeting and sometimes exceeding customerspsila expectations. Agent-based approach to modelling such business processes has much recompense especially in a virtual enterprise where business entities are distributed over dispersed geographical locations. This model takes advantage of core agentpsilas features and adds autonomous and flexible properties to supply chain system, thus making it proactive and responsive to better compete and efficiently collaborate in creating customer-centred products. In this paper, we propose a multi-agent system framework for a Virtual Enterprise (VE) involved in the manufacturing of products and capture the logic of the production planning with a simple decision tree. This approach relatively simplifies the transformation of the complex logic property of the system to a declarative programming language and facilitates implementation. Also, the agents collaboratively get product order from customers, plan and execute the production processes as well as coordinate the prompt delivery of the finished products. This makes the system akin to a digital ecosystem and invariably gives such business enterprise an edge over its counterparts in the highly competitive market place.
[Show abstract][Hide abstract] ABSTRACT: The flourishing idea of semantic Web is realized as extension of the World Wide Web infrastructure. The WWW has rehabilitated interest in semantic interoperability between various semantic languages. Semantic languages like OWL, WSML and FIPA SL formalize WWW into machine process able and understandable, by their ability to represent machine interpretable contents on the Web. These semantic description languages differ in syntax and semantic representation, resulting in mismatches that hamper semantic information exchange and interoperability for cross service utilization among the resulting information systems. In this paper we propose agent based technique to facilitate translation among heterogeneous contents while preserving the semantics. We propose the architecture to realize the system in a middleware that enables agent based dynamic semantic interoperability between FIPA compliant software agents and semantic Web languages including OWL and WSML. We have developed a prototype application through which a software agent communicate and use a Web service published in OWL or WSML and vice versa.
[Show abstract][Hide abstract] ABSTRACT: The flourishing idea of semantic Web being realized as extension of the World Wide Web infrastructure has rehabilitated interest in semantic interoperability between various semantic languages. Semantic languages like OWL, WSML and FIPA SL formalize WWW into machine process able and understandable, by their ability to represent machine interpretable content on the Web. These semantic description languages differ in syntax and semantic representation, resulting in mismatches that hamper semantic information exchange and interoperability for cross service utilization among the resulting information systems. In this paper we propose techniques to facilitate translation among heterogeneous contents while preserving the semantics. We then propose the architecture to realize the system in a middleware that enable dynamic semantic interoperability between FIPA compliant software agents and semantic Web languages including OWL and WSML. We also develop a prototype application through which a software agent invoke and use a Web service published in OWL or WSML and vice versa.
[Show abstract][Hide abstract] ABSTRACT: In this paper, we propose a framework for efficient discovery of OWL-S based web services. We use proactive push model approach for providing service notifications to service requester and Semantic based capability matching of OWL-S Web Service descriptions. We discuss the applicability of publish/subscribe paradigm within the current requester/provider model of semantic web service discovery. Our objective is to reduce the searching over UDDI by different service requesters having same requests and also by repeated service requesters having same requests again and again in search of newly published and updated advertisements. Our proposed approach is effectively useful in the context of Autonomous Semantic Grid where software agents require web services instantaneously to accomplish their goals.
[Show abstract][Hide abstract] ABSTRACT: In this paper, we propose a framework for efficient discovery of OWL-S based Web services. We use proactive push model approach for providing service notifications to service requesters over Web Service registry. We discuss the applicability of publish/subscribe paradigm within the current requester/provider model of semantic Web service discovery. Our objective is to reduce the searching over UDDI by different service requesters having same requests and also by repeated service requesters having same requests again and again in search of newly published and updated advertisements. Our proposed approach is effectively useful in Autonomous Semantic Grid where software agents require Web services instantaneously to accomplish their goals.