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위상이동 ESPI를 이용한 미세용접변형 측정에 관한 연구
이건하,김지태,나석주,Lee, Gun-Ha,Kim, Ji-Tae,Na, Suck-Joo 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.12
ESPI is a noncontact, nondestructive and relatively fast inspection method. For these reasons ESPI is being applied as a valuable tool in the nondestructive evaluation of structural components. Phase shifting ESPI is used more effectively than the traditional ESPI because spatial resolution of small object displacements are improved and numerical phase values are obtained for all pixels in the image. Consequently the quantitative measurement of deformation is possible. ESPI fringe patterns are contaminated with high levels of speckle noise. Therefore the phase image is to be smoothed to remove the noise and obtain a better signal-to-noise ratio. In this study, smoothing is done by phase shifting convolution to avoid smoothing errors close to the 2$\pi$ phase ambiguities in the deformation phase image, and median filter is used as a smoothing filter.
이건하(Gun-Ha Lee),김동욱(Dong-Uk Kim),나성준(Sung-Jun Na),이승현(Seung-Hyun Lee),신동렬(Dong Ryoel Shin) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
The goal of this paper is to propose a way to federate DF registries so that makes users or autonomous agents to find target agents more conveniently and efficiently. We designed federation for DF registry supporting the cooperation. We introduce the proposed system for agent platform and describe how to use the proposed system for registering agent services and searching target agent services for communications.
이건하(Gun-Ha Lee),허승필(Seung-Pil Heo),김동욱(Dong-Uk Kim),최기현(Kee-Hyun Choi),신동렬(Dong Ryeol Shin) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
The goal of this paper is to propose a way to register agents so that makes users or autonomous agents to find target agents more conveniently and efficiently. In order to achieve this goal, we have survey the key technologies such as agent platform, FIPA DF, JADE, repository systems. As the results, first we designed Web-based agent services registration/repository system. Next, we introduce the proposed system for agent platform and describe how to use the proposed system for registering agent services and searching target agent services for communications. Finally, we give an example to illustrate a typical scenario and describe the advantages of proposed system.
에이전트 기반 통합 u-Healthcare 시스템의 설계
김동욱(Dong-Uk Kim),이건하(Gun-Ha Lee),이승현(Seung-Hyun Lee),최기현(Kee-Hyun Choi),신동렬(Dong-Ryeol Shin) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
The rapid expansion of networked services and wide deployment of easily accessible wire Internet connection pave the way to access information and services using portable devices in mobile environments. Consequently, discovering and accessing distributed services in the Internet from portable devices in nomadic environments is of increasing interest for mobile users. But it is challenged by the deficiencies of wireless communication, heterogeneous environments, and user mobility. To surmount these obstaclses, in this paper, we propose an agent-based integrated u-healthcare system for efficient usage.
웹 기반의 Directory Facilitator를 위한 AJAX 보안 메커니즘
이승현(Seung-Hyun Lee),이건하(Gun-Ha Lee),신동렬(Dong-Ryeol Shin) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
The intelligent agent platform and service-sharing is important in ubiquitous environment. The Directory Facilitate based Web provides searching mechanism and service attribute lists. But, the DF based on web interface is weak in security. This paper is adopted Security Mechanism of AJAX for Web based Directory Facilitator. Our goal is to provide security function of Directory Facilitator and secured services.
유비쿼터스 네트워크에서 확장성을 보장하는 계층적 서비스 디스커버리
이규민(Kyu Min Lee),김동욱(Dong-Uk Kim),허승필(Seung-Phil Her),이건하(Gun-Ha Lee),최기현(Kee-Hyun Choi),신동렬(Dong-Ryeol Shin) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
As network techniques have been developed, a variety of service discovery protocols have been emerged. The service discovery protocols are to minimize the cost of detecting services and provide users with convenience among various devices and services. However, system complexity has been increased, and each service discovery protocol does not share services of them. Thus, users want a system, which can discover the most suitable service among all services in diverse service discovery protocol domains. In this paper, we propose hierarchical service discovery system, which guarantees scalability in ubiquitous networks. The system is composed of LSD [1] for ad hoc network, Discovery Middleware for home or hospital domains and D²HT algorithm [2] for Internet environment.
WIPI기반의 모바일 카메라폰을 이용한 4Gray Data Matrix 2차원 바코드 구현
허승필(Seung-Pil Heo),김동욱(Dong-Uk Kim),이건하(Gun-Ha Lee),이승현(Seung-Hyun Lee),신동렬 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
Recently, technologies of sensing the barcode widen as like the cellular phone, point-card, id and ticket. Through combination barcode with camera phone, relevant web contents or commerce is connected by sensing the newspaper or megazine. In this paper, we propose the web based product management system that consist of image process module, web server and product database. Proposed system uses the camera phone and follows the WIPI standardization. By using this system, user can send the product information to server and manage this information through web page.
멀티 에이전트 기반의 모바일 메신저 서비스의 설계와 구현
나성준(Na Sung-Jun),김동욱(Kim Dong-Uk),이건하(Lee Gun-Ha),정희진(Chung Hi-Jin),신동렬(Shin Dong-Ryeol) 한국방송·미디어공학회 2007 한국방송공학회 학술발표대회 논문집 Vol.2007 No.-
최근 유비쿼터스 환경이 도래함에 따라, 모바일 장비의 이용이 급격하게 증가하였다. 또한 이러한 모바일 장비와 더불어 각종 모바일 기반의 서비스 들이 나타나고 있다. 특히, 모바일 기반의 대표적인 서비스 중에서 메신저 서비스는 다중 사용자간의 대화, 파일 전송, 위치 추적 등의 다양한 서비스를 제공한다. 그러나 이러한 메신저 서비스의 수가 증가함에 따라, 사용자에게 선택의 어려움을 줄 수 있다. 또한, 이러한 각각의 메신저 벤더간의 프로토콜이 다르므로, 메신저간의 통합이 어렵다. 따라서 본 논문에서는 이기종 메신저간의 통합을 위한 에이전트 기반의 모바일 메신저 서비스의 아키텍처를 소개한다. 제안하는 메신저 서비스는 멀티 에이전트로 구성되며, 각각의 메신저 서비스의 사용자를 에이전트화 하여 에이전트간의 협업과 통신을 통한 메시지 송, 수신 및 파일 전송 등의 다양한 기능을 수행한다. 또한 제안하는 메신저 서비스는 에이전트 표준인 FIPA-ACL 통신 규약을 준수함으로써, 에이전트 기반의 이기종 메신저 서비스와의 통신을 통한 통합 프레임워크를 제공한다.