• Proceedings of the Korea Society for Industrial Systems Conference
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• 2003.05a
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• pp.3-7
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• 2003

For high performance Grid environments, an efficient GIS(Grid Information Service is required In the Metacomputing Directory Service(MDS) of the Glogus middleware, the Lightweight Directory Access Protocol(LDAP), which is a distributed directory service protocol, is used. The LDAP GIS differs from general purpose LDAP directories in that most of the LDAP operations are write in Grid environments. To get an efficient design of the GIS, it is thus required to analyze the performance of the LDAP system in the context of Grid environments. This paper presents the result of a performance analysis of LDAP systems. The main objective of the evaluation is to see the performance scalability of the LDAP system in the Grid environment where the write operations prevails. Based on these results, we suggest directions of an efficient LDAP-based GIS for a high performance Grid.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.354-354
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• 2006

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.67-69
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• 2004

본 논문은 Grid상의 workflow 시스템인 Workflow based Grid Portal for PSE(이하 WISE)를 이용한 인공 심장의 3차원 병렬 volume rendering system 디자인과 구현에 대하여 기술한다. Grid는 전 세계에 분산되어 있는 고성능, 대용량 자원들을 고속 네트워크로 연동하여 사용할 수 있게 하는 환경이며, WISE 시스템은 workflow 개념을 도입하여, 이런 자원들의 효율적이고 편리하게 관리해주고 아울러 여러 가지 패턴을 이용해 프로그래밍 할 수 있게 해주는 middleware이다. 본 논문에서는 Grid 상에서 WISE system에서 제공하는 프로그래밍 패턴을 이용하여 구조화되어 있지 않은 인공심장 데이터를 병렬 processing Pipeline 모델을 바탕으로 효율적인 parallel 3차원 가시화를 하기 위한 parallel pipelined volume rendering system을 구현하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.103-105
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• 2003

그리드 환경에서 효율적인 자원할당과 QoS를 보장하기 위해서는 먼저 각 자원의 사용가능한 정도를 정확히 파악하여야 한다. 본 논문은 정확한 자원을 측정하기 위한 리소스 모니터링 시스템을 제안하였다. 그리드에서의 모니터링 시스템은 기존의 모니터링 시스템과 차별화 되어있기 때문에 GGF(Global Grid Forum)에서 제안한 자원 측정 요구사항을 수용하여 구현하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.230-231
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• 2012

지능형 응용 개발 스튜디오의 어플리케이션 디자이너와 블록 에디터를 활용하면, 개발 언어에 대한 지식이 없거나 개발 경험이 없는 사람도 코드 작성 없이 간단히 Drag&Drop으로 기능을 개발 할 수 있다. 본 연구에서는 지능형 스튜디오 환경에서 간단한 온라인 게임을 시험적으로 제작하고 평가한다.

• Journal of Internet Computing and Services
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• v.8 no.3
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• pp.85-98
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• 2007

In distributed computing paradigm, mobile surrogate systems have not gained wide acceptance because of security concerns that have not been suitably addressed yet. Currently even the widely used Grid middleware, Globus, does not have a host authentication mechanism, which makes it hard to provide high performance Grid computing capabilities to mobile clients. In this paper, a mobile Grid service framework is designed and implemented in order to provide Grid services to mobile host such as PDA. The surrogate host-based system allows mobile hosts to be provided with Grid services while moving. The implemented mobile Grid services system has been applied to mobile healthcare system which utilizes Grid computing for ECG signal processing. The presented system framework can be used as a secure enterprise mobile healthcare system for hospital physicians.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.8
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• pp.1799-1808
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• 2010

Recently the increasing collaborative research requires the remote medical and clinical data sharing and access of external institutions. In this paper, an interoperability framework between Grid and PACS using Web services is proposed and implemented in order to provide flexible and efficient medical data management. The Digital Imaging and Communications in Medicine(DICOM) standard defines medical image data exchange and transfer between PACSs and image databases. However, medical data exchange between hospitals is limited within the trusted and static environments. Moreover, DICOM does not provide medical data management and the Grid middleware does not include standard toolkit to access DICOM data. To address this issue, a Web services-based Grid Service Mediator (WGSM) which provides PACS integration and medical image data management is developed. The WGSM consists of several service mediators such as compress mediator, GridFTP mediator, RFT mediator, MyProxy mediator, MDS mediator, and RLS mediator and others. The proposed Web services-based framework provides user authentication and secure data access between PACSs in collaborative environments. In particular, the WGSM allows ordinary users to access remote PACS data in a simple and efficient manner without any the knowledge about underlying Grid middleware.

• Journal of KIISE:Computing Practices and Letters
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• v.10 no.5
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• pp.375-384
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• 2004

The Grid is new infrastructure to provide computing environment for grand challenge research by sharing large-scale resources. Currently the Globus becomes a de facto standard middleware to construct Grid and supports core services such as resource management, security, data transfer, information services, and so on. However, it still needs more works and researches to satisfy requirements from various grid applications. A workflow management is becoming a main service as one of the important grid services for complex grid applications. We propose a Meta Scheduling Framework (MSF) in this paper. The MSF provides a XML-based Job Control Markup Language (JCML) for describing information and procedures of grid applications, and a workflow management service for scheduling the job using the JCML and for processing the job effectively.

• Proceedings of the Korea Contents Association Conference
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• 2007.11a
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• pp.574-577
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• 2007

e-Science Service Integration Workbench is the core tool that enables IT-based computation and engineering researchers to collaborate their research activities via data sharing, by semi-automatically supporting the activities. Workbench provides the researchers with a scientific workflow by establishing the environment that is capable of finding, registering, composing, and executing services-legacy codes wrapped with grid services or web services-they need to use. In other words, designing their scientific workflow through the workbench, they can receive or share its final result with their collegues by submitting jobs they describe to computational resources such as supercomputers or grids or requesting an experiment. In this paper, we propose an implementation architecture of e-Science Service Integration Workbench to support grid services of Grid Middleware.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.31-33
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• 2004

HLA (High Level Architecture) 는 모델링과 시뮬레이션 분야에서 상호 이질적인 서비스에 따른 어플리케이션의 상호운용성(interoperability)과 재사용성(reusability)을 증진시키기 위해 필요한 infrastructure를 개발하기 위한 청사진이다. RTI(RunTime Infrastructure)는 HLA 의 소프트웨어적 도구로써 IibTRI, FedExec, RTIExec의 세 가지 컴포넌트로 구성되어 있다. RTI는 분산환경에서 동적으로 다수대다수간의 통신을 제공하는 미들웨어 (middleware)이다. 대규모의 분산 시뮬레이션의 실행은 지리적으로 퍼져있는 많은 양의 컴퓨팅 자원을 필요로 할 수 있는데 이러한 환경이 가지는 보안과 동적 자원 할당이라는 문제점을 Globus Toolkit3(GT3)안의 Open Grid Service Arcitecture(OGSA)를 사용해서 해결할 수 있는 RTI-G를 개발해 왔고 이를 service-oriented RTI-G라 부른다. 이 논문에서는 service-oriented RTI on Grid 의 구조와 앞에 제시된 문제점들의 해결방안을 제시하고 실험한다.