Kee-Hyun Choi

A JXTA-based architecture for efficient and adaptive healthcare services

JXTA is a Peer-to-Peer application development infrastructure that enables developers to easily create service oriented software. This paper presents a low-cost, patient-friendly JXTA-based healthcare system, which is comprised of medical sensor modules in conjunction with wireless communication technology. In particular, the proposed system supports a wide range of services including mobile telemedicine, patient monitoring, emergency management and information sharing between patients and doctors or among the healthcare workers involved. For this purpose, the proposed system provides not only a systematic computing environment between the BAN (Body Area Network) and the subsystem within the hospital, but also participates in a JXTA network with the BANs PDAs through peers called JXTA relays. Information within the hospital is shared under a P2P environment by means of JXTA grouping technology. The proposed system is shown to be adequate for a ubiquitous environment which offers effective service management as well as continuous, remote monitoring of the patients status.

Service discovery supporting open scalability using FIPA-Compliant agent platfrom for ubiquitous networks

Service discovery protocol is the main element that determines the efficiency in middleware platform of ubiquitous networks. Recently, a large number of middlewares supporting scalability which focus on the distributed computing and data sharing among tremendous peers has been proposed. However, due to the distributed nature of ad-hoc networks, peers may not be able to find other peers and corresponding resources persistently. Furthermore, current service discovery engines do not provide open scalability that can make them to interoperate with each other. In this paper, we propose a simple mechanism, which provides cross-platform interoperability through directory federation combined with DHT mechanism to support open scalability and lightweight service discovery in ad-hoc network based on FIPA compatibility agent framework.

Service discovery using FIPA-compliant AP to support scalability in ubiquitous environments

Traditional service discovery mechanisms propose efficient and fast searching schemes for service discovery. And their schemes do not consider interoperability among discovery protocols. In this paper, we design an agent platform (AP) modifying FIPA-OS (Foundation for Intelligent Physical Agents Open Source) based on FIPA specifications. FIPA (Foundation for Intelligent Physical Agents) is a nonprofit organization aimed at producing standards for the interoperation of heterogeneous software agents. Until now FIPA specifications have not been considering mobile ad hoc networks. In such environments, agents can 7 find services offered by other service discovery engines in heterogeneous networks. We can guarantee scalability, by adding DM (discovery middleware) modules in the AP. The DM helps agents find and use services exploiting existing service discoveries under ad hoc networks. We chose UPnP (universal plug and play) and LSD (lightweight service discovery protocol) as DMs among various service discovery technologies. UPnP is a set of protocols for service discovery under development by the UPnP forum and LSD is a new discovery protocol for mobile ad hoc networks emphasizing on cache management that we designed. On our AP, we can use the services which devices of UPnP and LSD provide.

Reputation-Based Service Discovery in Multi-agents Systems

Reputation has recently received considerable attention within a number of disciplines such as distributed artificial intelligence, economics, evolutionary biology, and among others. Most papers about reputation provide an intuitive approach to reputation which appeals to common experiences without clarifying whether their use of reputation is similar or different from those used by others. DF provides a Yellow Pages service. Agents in the FIPA-compliant agent system can provide services to others, and store these services in the DF of the multiagent system. However, existing DF cannot detect the fake service which is registered by malicious agent. So,a user may search these fault services. In this paper, we analyze the DFpsilas problem and propose the solution. We describe the Reputation mechanism for searching these fake services. Reputation function assumes the presence of other agent who can provide ratings for other agents that are reflective of the performance or behavior of the corresponding agents.

A secure peer-to-peer group collaboration scheme for healthcare system

P2P (Peer-to-Peer) applications allow flexible organization, distribution of role to participating peers and the ability to share information with the other peers for group collaborations. As a result, P2P systems are not only gaining importance, but also becoming ubiquitous media for information exchange. JXTA is a P2P application development infrastructure that enables developers to easily create service-oriented software. This paper presents a low-cost, patient-friendly JXTA-based healthcare system, which is comprised of medical sensor modules in conjunction with wireless communication technology. Among the most important activities associated with the healthcare system are the sharing of medical information and collaborative medical work. The JXTA grouping service facilitates to share data in a secure manner under P2P environments. Through JXTA grouping service, we implemented a prototyped system, which improves the ability of the healthcare workers to cope with dynamic situation, which in turn makes it possible to offer more efficient medical services.

D2HT: directory federation using DHT to support open scalability in ubiquitous network

The traditional server-centric design for P2P service discovery is not suitable for ad-hoc environments. In this paper, in order to facilitate the inter operation of ad-hoc environments with other platforms, we introduce D/sup 2/HT, an algorithm which enables directory federation using DHT, in order to support open scalability. We also introduce the lightweight service discovery (LSD) protocol based on the FIPA compatible agent framework. Our approach overcomes the reconfiguration problems associated with other DHT variants (e.g. Chord (Stoica et al., 2001), CAN (Ratnasamy, 2001) and Pastry (Rowstron and Druschel, 2001), which arise when peers join/leave the network, as well as taking into consideration device limitations. We also present an initial implementation of LSD using iPAQs and the D/sup 2/HT-enabled FIPA agent platform.

Ag Webs: Web Services based on Intelligent Agent Platform

Web service technology is based on service-oriented architecture (SOA) as new computing paradigm and an intelligent agent platform provides service-discovery, communication, and interaction between heterogeneous platforms as middleware. As these trends looked promising, we propose an advanced SOA model using Web service by the intelligent agent platform. We aim to support the interoperability of service-oriented and large scale domain through integration of two technologies in this paper.

Design and Implementation of Advanced Directory Facilitator for Efficient Searching

Multi-agent technologies for ubiquitous environment became recently attractive for many peoples. According to these interests, agent technologies have been researched by various researchers and laboratories. In this multi-agent environment, each of these agents has its own services and stores the service descriptions in the service repository of the multi-agent system. From this repository, the user agent can search the specific descriptions which the user wants to find. In this paper, we proposed the efficient service repository architecture which can improve the existing directory facilitator as service repository. An advantage of using this architecture is that searching for suitable services can be faster than the old one.

Web-Based Integrated Service Discovery Using Agent Platform for Pervasive Computing Environments

Although current service discovery protocols provide the same basic function of service discovery, they differ significantly in architecture, message exchange pattern, expected operating environment and service representation/description. These differences prevent service interoperability among protocols. To solve this problem, we propose a web-based integrated service discovery mechanism, using an agent platform to guarantee scalability of scope of available services without modifying existing service discovery protocols. The proposed web-based integrated service discovery mechanism provides users with a wider selection of services, and convenient search methods.

An architecture for lightweight service discovery protocol in MANET

As the number of Internet services grows, it is becoming more important for the network users to be able to locate and utilize those services that are of interest to them. As a result, a service discovery protocols are coming to play an increasingly important role in highly dynamic networks. In this paper, we describe a new architecture for service discovery called LSD (Lightweight Service Discovery). The LSD is a peer-to-peer cache-based service discovery protocol for ad hoc environments. Through the LSD protocol, small handheld mobile devices with wireless connectivity can detect each other in their neighboring devices, and perceive whether particular shared services are available or not. In addition, the LSD solves the overhead problems which arise when traditional discovery protocols are applied to mobile ad hoc networks.