• 전기학회논문지
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• 제56권2호
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• pp.240-247
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• 2007

This paper presents an implementation of the generator protective relay using Real Time Digital Simulator (RTDS) user defined component (UDC) model designed to facilitate the investigation and evaluation of protective relays. The UDC for RTDS is a convenient model that allows user to develop new component models and run them on the RTDS. The developed model has major features related to the development of six models such as distance, frequency, reverse power, volts per Hz, over voltage, and out-of-step relays. Also, the generator relay models have been used to support and enhance power engineering education at both the undergraduate and graduate levels. The developed model functions are verified and tested by both static test and dynamic test. The simulation results show the capabilities of the developed generator relay using RTDS UDC.

• 디지털산업정보학회논문지
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• 제8권2호
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• pp.31-40
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• 2012

Face recognition refers to the process of identifying individuals based on their facial features. It has recently become one of the most popular research areas in the fields of computer vision, machine learning, and pattern recognition because it spans numerous consumer applications, such as access control, surveillance, security, credit-card verification, and criminal identification. However, illumination variation on face generally cause performance degradation of face recognition systems under practical environments. Thus, this paper proposes an novel face recognition system using a fusion approach based on local binary pattern and two-dimensional principal component analysis. To minimize illumination effects, the face image undergoes the local binary pattern operation, and the resultant image are divided into two sub-images. Then, two-dimensional principal component analysis algorithm is separately applied to each sub-images. The individual scores obtained from two sub-images are integrated using a weighted-summation rule, and the fused-score is utilized to classify the unknown user. The performance evaluation of the proposed system was performed using the Yale B database and CMU-PIE database, and the proposed method shows the better recognition results in comparison with existing face recognition techniques.

• 기술혁신연구
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• 제10권1호
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• pp.148-173
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• 2002

This study examines the impact of the Internet on the organizational innovation. With the introduction of digital technology, the entire organizational process and structure is now being restructured. The purpose of this study is to develop a framework to help classify the organizational innovations and understand organizational innovation processes. This study suggests that the wide diffusion of digital technology has affected the modularization of the organizational routines and processes. The modularization of knowledge and organization give rise to a new organizational architecture, a modular architecture. In the Fordist regime, the characteristics of organizations were depicted as vertically integrated and tightly coupled system. The organizational processes and routines were tightly linked and integrated. However, the diffusion of Internet, which has a tendency to disassemble this tightly coupled system, has resulted in the emergence of loosely coupled and vertically disintegrated system. Eventually the modular architectures are emerging as a new organizational paradigm in the post-Fordist regime. In this study, the modes of organizational innovation is classified as follows. If the organizational innovation enhances both existing organizational components and tile tightly coupled architecture, it is incremental innovation (Mode 1): if it destroys both existing components and the tightly coupled architecture, it is radical innovation (Mode 4): however if only the tightly coupled architecture is transformed into the modular architecture and the codification of organizational component is enhanced, the innovation is architectural (Mode 3). The last one is component innovation (Mode 2), in which existing organizational components are destroyed but tightly coupled architecture is enhanced. It is argued that the organizational innovation process follows Mode I$\longrightarrow$ Mode II $\longrightarrow$ Mode III $\longrightarrow$ Mode IV in order.

• 한국통신학회논문지
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• 제27권1A호
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• pp.13-17
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• 2002

제어 비트를 통한 직류 성분 제거 방법으로 주로 코드워드 끝단에서의 WRDS(word-end running digital sum) 기준을 적용하고 있다. WRDS 기준에 의한 직류 성분 제거 방법은 계산 및 구현이 쉬운 반면에 제어 비트 및 코드워드의 길이가 길어질수록 성능이 저하되는 단점이 있다. 복잡도가 높은 대신 최적의 성능을 갖는 방법으로 MSW(mean-square weight) 기준이 있다. 본 논문에서는 MPRDS(minimum peak RDS)라는 고밀도 광 기록 저장 장치를 위한 변조 코드의 새로운 직류 성분 제거 방법을 제안하였다. 이 방법은 계산 및 구현상의 복잡도가 MSW 기준에 비해 현저하게 낮으면서도 제어 비트 및 코드워드의 길이가 증가하더라도 MSW 기준에 의한 성능에 근접함을 입증하였다.

• 전기전자학회논문지
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• 제7권2호
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• pp.188-196
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• 2003

본 논문에서는 지상파 디지털 방송에 적용 가능한 MPEG-2 트랜스포트 스트림(Transport Stream)용 demultiplexer를 개발하였다. Demultiplexer는 MPEG-2 형식의 멀티미디어 데이터에서 영상부분, 음성부분, 그리고 데이터 부분을 분리하여 각각의 디코더로 전송하는 기능을 담당한다. 현재 대부분의 MPEG-2 transport stream용 demultiplexer들은 하드웨어 시스템으로 구성되어졌으나, 고성능 컴퓨터의 빠른 발전으로 인하여 소프트웨어적으로도 실시간으로 동작 할 수 있게 되었다. 개발되어진 소프트웨어 demultiplexer는 윈도우즈 환경에서 동작할 수 있도록 하기 위하여 COM(Component Object Model)기반의 Microsoft의 Directshow를 이용하여 filter형태의 소프트웨어 모듈로 개발하였다. Demultiplexer의 동작은 GraphEdit tool을 사용하여 확인하였으며, 이를 위해 MPEG-2 transport stream 형식의 테스트 파일을 랜더링 하였다.

• 디지털콘텐츠학회 논문지
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• 제10권2호
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• pp.319-326
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• 2009

본 논문에서는 별도의 센서를 부착하지 않고 영상만을 이용하여 실시간으로 손 형상을 인식하는 알고리즘에 대해 기술한다. 손은 형상이 매우 복잡하기 때문에 2차원 형상의 불변량에 해당하는 에지의 방향성 히스토그램을 이용하여 인식을 행한다. 이 방법은 복잡한 배경에서 피부색을 지닌 손 영역이 정확히 추출되며 손 형상을 인식하는데 있어서 수행속도가 빠르고 조명변화에 덜 민감하기 때문에 실시간 손 형상 인식에 적합하다. 본 논문에서는 손의 형상에서 방향이 틀어지는 경우에도 인식을 가능하게 하기위해 주성분 분석법을 사용하여 인식오차를 줄이는 방법을 기술한다. 이 방법을 사용함으로써 손 영상이 3차원적으로 회전에 의해 변하는 경우도 인식가능하게 되었다. 본 논문에서 제안하는 방법은 가정용 가전제품이나 게임을 제어하는 실시간 휴먼 인터페이스 제작에 사용 할 수 있다.

• 정보처리학회논문지D
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• 제11D권6호
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• pp.1239-1246
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• 2004

인터넷 기반의 광역화 물류환경인 e-Logistics에서 요구하는 가시성을 충족하기 위해서는 지역별 전자지도 및 차량 위치정보에 대한 공유와 통합이 필수적이다. 기존의 대부분의 차량관제시스템들은 독자적인 체계를 중심으로 구축되었기 때문에 정보의 공유와 통합을 위해서는 막대한 비용이 필요하다. 이를 효과적으로 해결하기 위해서 본 논문에서는 XML 엔코딩 표준인 GML을 이용하여 이동체 위치정보와 지도정보의 프리젠테이션을 위한 컴포넌트 기반의 개방형 시스템을 설계하고 구현하였다. 아울러 e-Logistics 환경의 배송 시나리오를 통한 실험을 통해 확장성 및 상호 운용성에 대한 우수성을 확인하였다.

• Smart Structures and Systems
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• 제24권6호
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• pp.759-768
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• 2019

In nuclear fusion reactors, the key structural component (i.e., the plasma-facing component) undergoes high heat flux cyclic loading. To ensure the safety of fusion reactors, an experimental study on the temperature-induced creep of stainless steel under heat flux cyclic loading was performed in the present work. The strains were measured using a stereo digital image correlation technique (3D-DIC). The influence of the heat haze was eliminated, owing to the use of a vacuum environment. The specimen underwent heat flux cycles ($500^{\circ}C-1000^{\circ}C$) with different mechanical preloads (0 kN, 10 kN, 30 kN, and 50 kN). The results revealed that, for a relatively large preload (for example, 50 kN), a single temperature cycle can induce a residual strain of up to $15000{\mu}{\varepsilon}$.

• 한국디지털정책학회:학술대회논문집
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• 한국디지털정책학회 2004년도 International Conference on Digital Policy & Management
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• pp.111-127
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• 2004

In this paper we describe an application of the lexical resource JurWordNet and of the Core Legal Ontology as a descriptive vocabulary for modeling legal domains. It can be viewed as the semantic component of a global standardisation framework for digital governments. A content description model provides a repository of structured knowledge aimed at supporting the semantic interoperability between sectors of Public Administration and the communication processes towards citizen. Specific conceptual models built from this base will act as a cognitive interface able to cope with specific digital government issues and to improve the interaction between citizen and Public Bodies. As a Case study, the representation of the click-on licences for re-using Public Sector Information is presented.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.211-213
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• 2005

In this paper, the frequency compensator for digital protective relay is introduced. Due to sudden appearance of generation-load or fault in power system, the frequency can deviate from its nominal value. The Orthogonal filter adopted to digital protective relay is exposed to the problem. Therefore, the frequency variation makes a difficult to protective function and power measurement in digital protective relay. The essential property of the proposed algorithm presented is its outstanding immunity to both signal orthogonal component magnitudes and DFT filter gain variations which ensures below 0.05Hz accuracy of estimation. Additionally, the proposed method has excellent characteristics with low signal sampling rate. Based on the frequency estimation, author design under frequency protection relay for generator and verifies its performance with several experimental tests.