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EMTP-MODELS를 이용한 Multi-Agent System 기반의 동기탈조 검출 알고리즘 구현
李秉炫(Byung-Hyun Lee),呂相敏(Sang-Min Yeo),李瑜珍(You-Jin Lee),成魯珪(No-Kyu Sung),金喆煥(Chul-Hwan Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.4
The protection against transient instability and consequent out-of-step condition is a major concern for the utility industry. Unstable system may cause serious damage to system elements such as generators and transmission lines. Therefore, out-of-step detection is essential to operate a system safely. Also, a multi-agent system is one that consists of a number of agents, which interact with one another. Multi-agent systems(MAS) can offer the flexibility and the adaptability to the previous algorithm. In this paper, the detection algorithm of out-of-step is designed by multi-agent system and implemented by EMTP-MODELS. To verify performance of the proposed algorithm based on multi-agent system, simulations by EMTP have been carried out.
도시특성에 기반한 공유 자전거 이용 패턴의 소셜 네트워크 분석 연구 : 서울시와 뉴욕시 데이터 사례 분석
이병현(Lee, Byung Hyun),최일영(Choi, Il Young),김재경(Kim, Jae Kyeong) 한국IT서비스학회 2019 한국IT서비스학회 학술대회 논문집 Vol.2019 No.2
공유 경제가 이슈화되면서 현재 여러 가지 형태의 공유 서비스들이 등장하고 있고, 이를 기반으로 한 공공 자전거 서비스는 현재 세계 각지에서 크게 인기를 끌고 있다. 본 연구에서는 서울시와 뉴욕시의 공공자전거 데이터를 빈도 분석하고 소셜 네트워크 분석 지표로 사용되는 내·외향 중심성과 k-core 알고리즘으로 핵심집단을 추출한 후, 산정한 결과 값을 가지고 두 도시 간의 차이점과 각 분석 지표 간의 상관관계를 분석하였다.
온라인 뉴스를 이용한 기업평판 구성요인 탐색 및 지수 개발 연구 : 감성분석과 AHP적용
이병현(Byung Hyun Lee),최일영(Il Young Choi),이정재(Jung Jae Lee),김재경(Jae Kyeong Kim),강현모(Hyun Mo Kang) 한국IT서비스학회 2020 한국IT서비스학회지 Vol.19 No.6
Because of the recent development of information and communication technology, companies are exposed to various media such as blogs, social media, and YouTube. In particular, exposed news affects the company s reputation. So, while positive news can improve corporate value, negative news can lead to financial losses for the company. In this study, we redefine corporate reputation as social responsibility, vision and leadership, financial performance, products and services through existing literature, and conducted an AHP survey with a total of four components to calculate the weight of each factor. As a result of the calculation, the proportion of financial performance was the highest at 0.41, and products and services, vision and leadership, and social responsibility were the lowest. In addition, in order to measure the reputation of a company, it is classified as a component that defines online news using the LDA technique. In addition, through sentiment analysis, an index for each corporate reputation factor was derived, and the reputation index was calculated by combining it with the AHP analysis result, and Spearman ranking correlation analysis was performed to secure the validity of the research results. Therefore, the significance of this study is that the definition and importance of the constituent factors can contribute to the future planning and development direction of the company, and also contribute to the derivation of the corporate reputation index. This study is significant in that a new analysis methodology that applied AHP analysis results to sentiment analysis was suggested.
곡선모델 차선검출 기반의 GPS 횡방향 오차보정 성능향상 기법
이병현(Byung-Hyun Lee),임성혁(Sung-Hyuck Im),허문범(Moon-Beom Heo),지규인(Gyu-In Jee) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.2
GPS position errors were corrected for guidance of autonomous vehicles. From the vision, we can obtain the lateral distance from the center of lane and the angle difference between the left and right detected line. By using a controller which makes these two measurements zero, a lane following system can be easily implemented. However, the problem is that if there’s no lane, such as crossroad, the guidance system of autonomous vehicle does not work. In addition, Line detection has problems working on curved areas. In this case, the lateral distance measurement has an error because of a modeling mismatch. For this reason, we propose GPS error correction filter based on curve-modeled lane detection and evaluated the performance applying it to an autonomous vehicle at the test site.
지능형 교통시스템에 적합한 위성항법 기반의 정밀측위 구조 설계
이병현(Byung-Hyun Lee),임성혁(Sung-Hyuck Im),허문범(Moon-Beom Heo),지규인(Gyu-In Jee) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.11
In this paper, a structure of precise positioning based on satellite navigation system is proposed. The proposed system is consisted with three parts, range domain filter, navigation filter and position domain filter. The range domain filter generates carrier phase-smoothed-Doppler and Doppler-smoothed-code measurements. And the navigation filter calculates position and velocity using double-differenced code/carrier phase/Doppler measurements. Finally, position domain filter smooth position error, and it means enhancement of positioning performance. The proposed positioning method is evaluated by trajectory analysis using precise map date. As a result, the position error occurred by multipath or cycle slip was reduced and the calculated trajectory was in true lane.