Yun-Young Hwang

A Framework for XML Web Services Retrieval with Ranking

XML Web Services, which have been recently used to implement SOA (Service Oriented Architecture), have been making it possible to build and to execute business processes by dynamically calling services on World Wide Web. To use of these services, it is required for users to find relevant services from a collection of services dispersed on the web. We currently use UDDI, a distributed registry system for Web services, to find services. However, UDDI only supports exact keyword match and category based query towards UDDI data entries representing each Web service, so it is hard to get a ranked query result and alternate services which are other possible services when a currently chosen service is no more useful or unreachable. Moreover, UDDI does not use WSDI definitions that actually describe service interfaces and message formats of Web services as a target of queries. In this paper, we introduce a framework for XMI Web services retrieval, which can solve the current problems that lie on the UDDI. Our system is located on top of UDDI using UDDI data entries and WSDL files; it provides ranked query result of Web services and finding alternate Web services by using a similarity measure. In addition, we discuss related works and further features needed to improve performance of this Web service retrieval framework.

Design of DPWS Adaptor for Interoperability between Web Services and DPWS in Web Services on Universal Networks

In ubiquitous computing, clients should be able to use any kinds of services whenever and wherever they are. Service has the same quality without concerned with characteristics such as the status and location of services or devices. Because the characteristics are dynamically changed, a sub-network is difficult to reflect all the changes. So, there are various sub-networks. It is necessary to integrate communication between sub-networks with interoperability. For this reason, a system must support data transmission and conversion. It also has to indicate dynamic detection of the sub-network service by events and notifications. So, we introduced WSUN environment which is composed of US Broker, US registry and UniA for using universal service. This paper designs the DPWS Adaptor for providing universal service through operational scenario of DPWS.

Universal Service Discovery Protocol

In ubiquitous computing, client should be able to discovery and use any kind of services whenever and wherever they are. We need the service discovery protocol for realization of ubiquitous. This protocol must be reflex dynamic feature of ubiquitous such as service status and location. WS-Discovery, which support peer to peer environment, must find the service every time when the clients required the service. Also, this protocol only support the SOAP based protocol. This fact brings the problem that it does not support interoperability between sub-networks. To solve these problems, we apply the Universal Service Discovery Protocol. It supports any type of service discovery and interoperability between sub-networks. Also, this protocol reflects the features of ubiquitous.

Web services on universal networks

The clients, in ubiquitous environment, want to be consistently offered services at any time and in any places. There are so many service discovery middleware such as Jini, UPnP and HAVi. Each one of them supports different communication protocol. Therefore, when the clients ask an inquiry of service search, they have to support communication protocol of all service discovery middleware. Namely, all the cost shall be borne by the customer. In addition, these middleware does not consider the service location and status. To solve these problems, we suggest the SOA-based framework is Web Services on Universal Networks. The framework supports a dynamic service discovery through the interoperability between service discovery middleware. Furthermore, it considers service location and status at service discovery process.

Task-Based Services Composition for Ubiquitous Computing

In order to satisfy incremental business demands, it is often required to combine functionalities of several services together. The semantic web provides the infrastructure for composition of service functionalities, and it aims to create ontology-based and machine-process able the content. In addition, by applying semantic web technologies, many research works have been investigated to support automatic service composition. Despite of the significant results being achieved, the task of service composition is still challenging and complex issue. In this paper, we will introduce our approach for developing ontology based on SCDL(Service Composition Description Language) and the MIT process handbook, called u-TO(universal task ontology), which can be used for users describing and specifying semantically their needs. Our task ontology (u-TO) can be then transformed into executable business processes by underlying systems. In addition, it aims at facilitating the modeling of complex demands or systems without regarding details of technical aspects of underlying infrastructure.

Dynamic service composition in ubiquitous environment

Service Component Architecture (SCA) defines how to create components and how to combine those components into complete applications. SCA defines a general approach to doing both of these things at design time of applications. In ubiquitous, we consider dynamic factors such as frequently movement of user or device location and change of service status. SCA does not consider about that, but this specification proposed good solution about service composition. For this reason, we suggested the service composition approach, which is extended of SCA. Our approach supports dynamic service composition, which is considered the dynamic factors of ubiquitous environment. In addition, it reflects the user requirement like that what kind of service to do in what order. It also supports coordination of service when the client can no longer use the service because it is putted off the power or has another problem.

UWS Broker for Ubiquitous Web Services Dynamic Discovery

Ubiquitous system provides web services which clients want irrespective of specific places and time. However, current services and devices supported by them are operated by different communication systems. To solve this problem, a system which can guarantee interoperability of services and devices is required. This paper introduces the UWS Broker, which is a middleware to discover services dynamically in ubiquitous environments. The UWS Broker, which is SOA oriented, is devised for different network based devices and services.

A self-organizing two-way DPWS adaptor for adaptive interoperability of multiple heterogeneous services

Although distributed middleware technologies such as UPnP, Jini, HAVi and DPWS generally feature the same goals, many different factors are also isolated from each other. This paper outlines a self-organizing two-way DPWS adaptor which aims to provide the adaptive interoperability of multiple heterogeneous services in pervasive computing. The proposed infrastructure employs Devices Profile for Web Services (DPWS) as the underlying integration technology. The mean of self-organizing involves obtaining the metadata of the DPWS devices and DPWS-hosted services automatically to provide other distributed middleware clients with DPWS-hosted services. A prototype implementation of the DPWS adaptor is also presented and the paper concludes with general remarks and a discussion of future works.

Representing Process-Based Ontology Using Topic Maps for Web Services

The intelligent discovery of Web services is an important factor in automatic Web services. Thus far, discovery methods have been heavily dependent on the input/output and the precondition/effect of a service. In addition, they have not used ontology describing internal operations. Thus, users have much difficulty in finding the service that they want with the previous methods. In this study, a process-based ontology, TM-S (topic maps-based ontology for service) is developed. The characteristics of TM-S are beneficial in terms of filtering out unrelated services and enhancing a users retrieval capabilities. Additionally, TMS-QL (TM-S Query Language) was developed; directing users in how services can be found using TM-S

The Methods of Collecting, Preservation, Reproduction for Records of Public Sector's Facebook Pages

Social Network Service (SNS) has gained great popularity. Recently, facebook has been used most active. Most of government ministries of Republic of Korea operates facebook. In the case of facebook, it takes advantages of possibilities to inform the direction of policy to aggregate opinions of people for issues. Information gained from facebook has a very important value to be reflected in the policy or to understand public opinions. Long-term storage for this information should be considered. In the case of overseas, tools for long-term storage of documentary facebook have recently been developed. However, it does not save all the data in facebook and ignores the principles for long-term storage. These tools are limited to a simple backup. Therefore, this study aims to investigate how to reproduce, store and collect facebook page records of the government ministries.