• Journal of KIISE:Software and Applications
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• v.36 no.3
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• pp.187-199
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• 2009

With the advent of Web 2.0, OpenAPIs are becoming an increasing trend to emphasize Web as platform recently. OpenAPIs are used to combine services and generate new services by mashup. However because the standard documents for OpenAPIs do not exist, it may restrict the use of OpenAPIs. Previous studies of OpenAPIs mashup have been limited to tool design or language definition for service combination rather than dynamic composition. On the other hand, Web services that are a software technology implementing SOA provide standard documents such as WSDL to explain each service, UDDI to register it, and SOAP to transfer messages. Thus Web applications can interpret and execute services by using these technologies. Recent works have also been performed to provide semantic features and dynamic composition for SOA. If a dynamic and systematic approach is provided to combine Web services and OpenAPIs, Web applications can provide users with diverse services. In this study, we present a SOA based framework for mashup of OpenAPIs and Web services. The framework supports dynamic composition of OpenAPIs and Web services, where the process of composite services is described in OWL-S. A prototype is provided to validate our framework. The framework is expected to add diversity to typical Web services.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.2B
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• pp.313-324
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• 2010

IPTV has been launched to provide a simple convergence service with broadcast and communication, and now it is evolving to support personalized service capabilities according to user's requirements. The paper presents DSON architecture and its control model to provide personalized features and user centric capability in IPTV services over service overlay network. Furthermore, the paper introduces DSON based service models on community IPTV and home IPTV service model.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05b
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• pp.1397-1400
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• 2003

JXTA 기술은 네트워크 프로그래밍과 컴퓨팅 플랫폼으로 P2P(peer to peer) 컴퓨팅이나 P2P 네트워킹이라는 영역에서 폭넓게 발생하는 문제를 해결하기 위해 만들어진 것이다. P2P 네트워크 영역과 같은 분산 컴퓨팅 문제를 해결할 수 있는 JXTA 플랫폼을 이용하여 효율적인 이동 에이전트 시스템을 설계하여, 동적으로 경로를 선정하고, 서비스에 부하를 덜 주면서 Peer 에게 서비스를 제공하는 시스템을 제안한다.

• 한국IT서비스학회:학술대회논문집
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• 2010.05a
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• pp.498-502
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• 2010

본 논문에서는 MDA(Model Driven Architecture)기반의 소프트웨어 개발 방법 중 OMG UML 모델링을 제공하는 RIA(Rich Internet Application)기반 UML 모델링 도구를 제안한다. 기존의 UML 모델링 데스크톱 어플리케이션은 플랫폼 및 환경에 종속적인 단점 을 지니고 있다. 이러한 단점은 상이한 개발 환경에서의 의사소통 저해 요소로 모델 기반 개발 시 개발 생산성을 가로막는 장애 요인이 된다. 본 논문에서 제안하는 RIA기반 UML모델링 도구인 ModelingON은 다양한 플랫폼 상에서 웹 브라우저를 통해 설계 환경을 제공함으로서 개발자 간의 원활하고 동적이며 양방향 적인 설계 방법을 제공할 것이다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06b
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• pp.315-320
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• 2007

유비쿼터스 컴퓨팅이란 언제, 어디서나, 아무 때나 네트워크를 통해 정보를 접할 수 있는 사회를 말한다. 이러한 유비쿼터스 컴퓨팅 환경에서 사용자가 정보를 다양한 디바이스들로부터 받아들이고 받아들인 정보를 바탕으로 사용자에게 맞는 이벤트가 수행될 수 있는 통합 환경을 "UDI (Ubiquitous Data Integration) 서비스 플랫폼"이라 한다. 본 논문에서는 이러한 UDI 서비스 플랫폼의 구성 중 최상위 응용 계층으로 Cyber View 라는 자바 기반 명세도구를 개발하여 사용자가 정의한 이벤트를 다양한 디바이스를 통해 실행할 수 있 는 사용자정의 도구 개발에 관한 연구를 기술할 것이다.

• Journal of the Korea Society of Computer and Information
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• v.10 no.4 s.36
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• pp.355-364
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• 2005

An example of such a new device is a mobile phone. The demand for wireless data communication is growing rapidly. However, agencies have not yet completed the standardization of the markup language. Due to the evolution of the Mobile Device, the agencies in this field have provided different data formats with each Mobile Device Platform. Traditionally, contents are hand-tailored to suit the target devices. A key problem is that the characteristics and capabilities of mobile devices are too diverse to service the most suitable mobile contents. Owing to this problem, the need for a reusable document description language increases. In this paper, we defined Template file that is common data to service mobile devices. We proposed method that could be effective wireless web service though design and the implementation of the Call Manager & the XSL Generator. In the methodology, when requesting wireless internet service, the mobile device finds out Markup language and hardware specification of the mobile device through the Call Manager component supports. The XSL Generator component creates XSL file dynamically that is the most suitable to device. Finally, contents is serviced to each device by XSLT.

• Journal of KIISE:Information Networking
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• v.31 no.4
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• pp.384-392
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• 2004

Mobile contents service providers have some difficulties to timely and proper service deployment due to rapid development cycle of diverse portable devices with different capabilities. A way to resolve the problem is to introduce a mobile contents service paltform that can adapt original mobile contents to diverse devices dynamically and automatically. In this paper, we propose a mobile contents service platform based on active network mechanisms, called Mobile Content Adaptation Network(MobiCAN). The MobiCAN node provides effective service deployment, execution, and maintenance features and accommodates service layering and service customization capabilities for easy deployment. The basic functional units of the MobiCAN node are micro services with well-defined service interfaces and service layering features. For reliable services among the MobiCAN nodes, we design new distributed and robust Overlay Management Protocols(OMPs). As an example of practical MobiCAN applications, we finally describe Dynamic Contents Customization Proxy(DCCP) service.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.8
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• pp.1171-1177
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• 2013

Since existing location-based services suggest a search result, not considering user's environment, intention, or preference, situational awareness is required to resolve this problem. In this paper, an Android-based situational-awareness dynamic scheduling will be suggested and a tourist information service application will be embodied and tested. In other words, a real-time tourist scheduling service that calculates an estimated travel time from user's location to destination and reminds a user before the expected departure time will be developed. In addition to tourist information, an added scheduler provides convenience and improves its functionality.

• The KIPS Transactions:PartA
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• v.12A no.6 s.96
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• pp.477-484
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• 2005

Applications in ubiquitous environments should provide the best services to users by considering the changes of users requirements and service environments, and should adapt service behaviors to the underlying platform's behaviors according to contextual changes. To reflect users requirements actively and provide more flexible services, we propose 2-level context adaptation method for supporting dynamic application adaptability in contextual changes. We offend the range of contexts to users requirements for supporting context adaptation. It can reflect users preferences in offering application services. For application adaptability, we use adaptation policies to allow applications require how they adapt to specific contexts, and to make them react actively on such situations.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.199-201
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• 2005

유비쿼터스 환경에서의 응용은 사용자의 요구사항 변경과 사용자의 서비스 환경 변화를 적응시킴으로써 사용자에게 최선의 서비스를 제공할 수 있어야 한다. 또한 상황변화에 따른 하부 플랫폼의 동작에 서비스의 동작을 적응시킬 수 있어야 하며, 시스템은 이러한 정보를 사용하여 시스템 자체의 동적인 구성이 유비쿼터스 형태로 이루어지도록 해야 한다. 유비쿼터스 환경에서 적응성을 갖춘 응용 서비스를 지원하기 위해서는 응용 서비스가 실행 환경의 변화를 검출할 수 있어야 하며 이러한 변경된 사항들이 수용될 수 있도록 하부의 미들웨어 기능 요소들을 재구성할 수 있어야 한다. 이를 위해 모바일 서비스 적응성지원을 위한 미들웨어시스템을 연구 개발하고자 한다.