• Proceedings of the Korea Information Processing Society Conference
• /
• 2004.05a
• /
• pp.633-636
• /
• 2004

웹 서비스는 이질적인 응용 시스템들 사이의 연동 및 통합을 위한 표준화된 수단을 제공한다. 본 논문에서는 기존 웹 서비스들을 이용하여 정의되는 복합 웹 서비스를 효율적으로 실행하기 위한 방안으로서 사용자 에이전트를 이용한 분산 처리 시스템 구조 및 처리 방법을 제안한다. 본 시스템은 웹 서비스들의 통신 QoS 및 복합 웹 서비스의 부하 등을 고려하여 복합 웹 서비스의 호출 및 통합 작업을 사용자 에이전트에게 동적으로 위임하여 분산 처리함으로써 복합 웹 서비스의 성능 및 가용성을 향상시킨다.

• Journal of Korea Multimedia Society
• /
• v.11 no.9
• /
• pp.1310-1323
• /
• 2008

Recently, many studies on automated generation of composite Web services have been done. Most of these works compose Web services by chaining their inputs and outputs, but do not consider the functional semantics. Therefore, they may construct unsatisfied composite services against users' intention. Futhermore, they have high time-complexity since every possible combinations of available services should be considered. To resolve these problems, this paper proposes a sophisticated composition method that explicitly specifies and uses the functional semantics of Web services. Specifically, A graph model is constructed to represent the functional semantics of Web services as well as the dependency among inputs and outputs. On the graph, we search core services which provide the requested function ality and additional services which transform between I/O types of the user request and the core services. Then, composite services are built from combinations of the discovered services. The proposed method improves the semantic correctness of composite services by the functional semantics of Web services, and reduces the time complexity by combinations of functionally related services.

• Proceedings of the Korean Information Science Society Conference
• /
• 2007.10b
• /
• pp.98-103
• /
• 2007

복합 웹 서비스에 대한 요청이 증가하고 있지만 유비쿼터스 환경에서 일반 사용자들이 쉽게 복합 웹 서비스를 사용할 수 있는 환경은 마련되지 않고 있다. 본 논문에서는 자연어 기반의 사용자 친화적인 인터페이스를 개발하여 이를 통해 웹 서비스나 해당 서비스 도메인 영역에 대해 지식이 전혀 없는 일반 사용자가 쉽게 자신의 요구사항을 표현하고, 사용자의 표현을 효율적으로 분석하여 복합 웹 서비스를 자동 구성하는 시스템을 제안한다. 특히 복수 문장으로 구성된 복잡한 자연어 요청으로부터 정교한 수준의 추상 워크플로우를 추출하는 방법을 제안한다.

• Journal of KIISE:Software and Applications
• /
• v.34 no.5
• /
• pp.431-446
• /
• 2007

Executable composite Web services are selected by binding a given abstract workflow with the specific Web services that satisfy given QoS requirements. Considering the rapidly increasing number of Web services and their highly dynamic QoS environment, the fast selection of composite services is important. This paper presents a method for quality driven comosite Web services selection based on a workflow partition strategy. The proposed method partitions an abstract workflow into two sub-workflows to decrease the number of candidate services that should be considered. The QoS requirement is also decomposed for each partitioned workflow. Since the decomposition of a QoS requirement is based on heuristics, the selection might fail to find composite Web services. To avoid such a failure, the tightness of a QoS requirement is defined and a workflow is determined to be partitioned according to the tightness. A mixed integer linear programming is utilized for the efficient service selection. Experimental results show that the success rate of partitioning is above 99%. Particularly, the proposed method performs faster and selects composite services whose qualities are not significantly different (less than 5%) from the optimal one.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2009.10a
• /
• pp.495-498
• /
• 2009

In Ubiquitous computing environment, as the requirements of various services and combination of personal digital assistant are increasing, the standards and technologies have been developing all over the world. Also, ubiquitous government is planning to provide seamless service therefore, the demand is very high about infrastructure of service combination which connects various governmental systems. As a result, it is required that the Service-Oriented Architecture (SOA) and technical developments which combine various services, devices and terminal accepting to use seamless service convergence in ubiquitous computing environment. In this paper, I suggest to combine for a single web service to use Business Process Management (BPM). It can be expected to develop technologies efficiently and effectively by reusing web services, and reducing mistakes and faults of the development.

• Journal of KIISE:Computing Practices and Letters
• /
• v.16 no.2
• /
• pp.144-156
• /
• 2010

With the wide spread of Web services in various fields, there is a growing interest in building a composite Web service, however, it is very difficult for ordinary users to specify how to compose services. Therefore, a convenient interface for generating and invoking composite Web services are required. This paper proposes a natural language interface to invoke services. The proposed interface provides a way to describe users' requests for composite Web Services in a natural language. A user with no technical knowledge about Web services can describe requests for composite Web services through the proposed interface. The proposed method extracts a complex workflow and finds appropriate Web services from the requests. Experimental results show that the proposed method extracts a sophisticated workflow from complex sentences with many phrases and control constructs.

• Information and Communications Magazine
• /
• v.27 no.5
• /
• pp.30-35
• /
• 2010

인터넷의 발전 과정에서 데이터 중심의 시맨틱 웹 기술과 서비스 중심의 웹 서비스 기술은 시맨틱 웹 서비스라는 융합기술로 발전하고 있다. 본 고에서는 시맨틱 웹 서비스의 핵심 기술인 어노테이션, 발견, 조합, 실행, 중재 기술에 대해 소개하고, 산업계와 학계의 연구 동향을 분석한다. 더불어 시맨틱 웹 서비스 기술이 융복한 서비스 발전에 미치는 영향을 간략히 고찰하고자 한다.

• Journal of KIISE:Databases
• /
• v.33 no.7
• /
• pp.715-726
• /
• 2006

Web service technologies provide a standard means for interoperation and integration of heterogeneous applications distributed over the Internet. For efficient execution of hierarchically interacting composite web services, this paper proposes an approach to distribute web service invocations over peer systems effectively, exploiting intensional XML data embedding external service calls as a result of well services. A cost-based optimization problem on the execution of web services using intensional results was formalized, and a heuristic search method to find an optimal solution and a greedy algorithm to generate an efficient invocation plan quickly were suggested in this paper. Experimental evaluation shows that the proposed greedy algorithm provides near-optimal solutions in an acceptable time even for a large number of Web services.

• Journal of Intelligence and Information Systems
• /
• v.16 no.4
• /
• pp.173-193
• /
• 2010

The World Wide Web is transitioning from being a mere collection of documents that contain useful information toward providing a collection of services that perform useful tasks. The emerging Web service technology has been envisioned as the next technological wave and is expected to play an important role in this recent transformation of the Web. By providing interoperable interface standards for application-to-application communication, Web services can be combined with component-based software development to promote application interaction and integration within and across enterprises. To make Web services for service-oriented computing operational, it is important that Web services repositories not only be well-structured but also provide efficient tools for an environment supporting reusable software components for both service providers and consumers. As the potential of Web services for service-oriented computing is becoming widely recognized, the demand for an integrated framework that facilitates service discovery and publishing is concomitantly growing. In our research, we propose a framework that facilitates Web service discovery and publishing by combining clustering techniques and leveraging the semantics of the XML-based service specification in WSDL files. We believe that this is one of the first attempts at applying unsupervised artificial neural network-based machine-learning techniques in the Web service domain. We have developed a Web service discovery tool based on the proposed approach using an unsupervised artificial neural network and empirically evaluated the proposed approach and tool using real Web service descriptions drawn from operational Web services repositories. We believe that both service providers and consumers in a service-oriented computing environment can benefit from our Web service discovery approach.

• TTA Journal
• /
• s.111
• /
• pp.76-85
• /
• 2007

웹2.0의 등장과 함께 사용자 참여, 공유, 개방의 개념은 기존의 서비스 구조나 비즈니스 모델의 파괴(Disruption)와 함께 인터넷 기반의 모든 서비스로 빠르게 확산되면서 새로운 경쟁력을 갖는 서비스로 다시 태어나고 있다. 또한, 웹 기술의 발전은 기존의 다른 서비스의 발전에 크게 영향을 끼치고 있는데 이는 웹의 기본적신 속성인 표준에 기반한 개방형 구조를 기반으로 하여 다양한 융복합 서비스 제공을 가능하게 하기 때문이다. 인터넷 기반의 TV 서비스 분야에서도 예외는 아니며, 이미 TV 2.0, Broadcast 2.0이란 용어가 등장하고 있는 등 TV 서비스가 인터넷과 같은 개방된 네트워크를 기반으로 할 때 가질 수 있는 장점들이 새롭게 부각되고 있다. 본 고에서는 웹 2.0기반의 기술이 IPTV와 같은 네트워크 기반의 TV 서비스와 연계될 경우 어떠한 특징과 장점을 갖는지를 알아보고 웹 2.0 관점에서 제공해야 되는 요소기술의 특징과 표준화 현황에 대해서 언급하며, 나아가 웹2.0 기반 IPTV 서비스의 발전방향에 대해서 살펴보고자 한다.