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온라인뉴스 텍스트 마이닝을 이용한 기업 평판과 수익성에 관한 연구
이병현(Byung Hyun Lee),최일영(Il Young Choi),전정우(Jeong Woo Jeon),최이권(Lee Kwon Choi),김재경(Jae Kyeong Kim) 한국경영과학회 2020 經營 科學 Vol.37 No.4
Because of the recent development of ICT (Information Communication Technology), companies are being exposed to various media such as the Internet and SNS. In addition, the company"s reputation is influenced by the exposed news. So, while positive news can improve corporate value, negative news can lead to the company"s financial losses. In this study, the factors of corporate reputation were redefined through existing literature as social responsibility reputation, vision and leadership reputation, financial performance reputation, and product and service reputation. Online news was categorized by the reputation component defined in this study, and then sentiment analysis was used to derive metrics for each corporate reputation component. In addition, investigating the impact of derived reputation factors on return on equity (ROE) revealed that vision and leadership factors (p = 0.016) and reputation and social responsibility (p = 0.021) influence returns. Equity capital. In addition, financial performance (p = 0.072) was statistically significant at the level of 0.1%, and financial performance and reputation were also found to affect profitability. And the product and service (p = 0.589) reputation was found to be statistically insignificant.
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.
EMTP-MODELS를 이용한 Multi-Agent System 기반의 자동 재폐로 계전 알고리즘 구현
李秉炫(Byung-Hyun Lee),成魯珪(No-Kyu Sung),呂相敏(Sang-Min Yeo),李瑜珍(You-Jin Lee),金喆煥(Chul-Hwan Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.1
This paper presents auto-reclosing algorithms with reference to power system stability based on MAS(Multi-Agent System). And this paper shows auto-reclosing algorithms considering power system stability. It includes the variable dead time, optimal reclosing, sequential reclosing, emergency extended equal-area criterion (EEEAC) algorithm, and modified EEEAC algorithm. This paper divides Auto-reclosing algorithms into respectively agents according to their tasks. A separated agent is merely a software entity that is situated in some environment and is able to autonomously react to changes in the environment. And all the simulations in this parer were tested by EMTP MODELS.
갈릴레오 GIOVE-A E1 신호 분석 및 RF 프론트엔드 대역폭 영향 분석
이병현(Byung-Hyun Lee),임성혁(Sung-Hyuck Im),지규인(Gyu-In Jee),고선준(Sun-Jun Ko) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.8
갈릴레오는 유럽에서 개발하고 있는 민간 주도의 새로운 위성항법시스템이다. 갈릴레오 시스템의 성능을 테스트하기 위한 테스트 위성인 GIOVE-A 위성이 현재 지구 상 궤도에서 항법신호를 송출하고 있다. 갈릴레오 시스템의 성능을 평가하고 향후 갈릴레오 수신기를 개발하기 위해서는 GIOVE-A 위성 신호를 분석할 필요가 있다. 본 논문에서는 GIOVE-A 위성신호를 수신 한 후 이를 GIOVE-A 신호 규격문서에 정의된 정보를 이용하여 신호 처리 하였다. 신호 획득, 추적 및 항법 메시지 디코딩의 과정을 수행하여 현재 GIOVE-A 위성의 항법정보 제공 상황을 파악하였다. BOC 신호 사용에 따른 항법신호 대역폭의 증가가 갈릴레오 신호가 GPS와 다른 점 중의 하나이며 RF 프론트엔드의 대역폭에 따른 항법 신호 수신 성능을 평가하여 현재 사용되고 있는 GPS L1 RF 프론트엔드를 사용할 수 있는지를 검토하였다. Galileo is a new civil Global Navigation Satellite System(GNSS) developed by Europe. GIOVE-A, a satellite to test Galileo system performance, transmits navigation signal on orbit. Evaluation of Galileo system and development of Galileo receiver needs to analyze GIOVE-A signals. In this paper, we received GIOVE-A signals and processed it using GIOVE-A Interface Control Document(ICD). Signal acquisition, tracking and navigation message decoding made grasping current signal status possible. Bandwidth increase by BOC modulation is one of the difference from GPS. Therefore, we investigated feasibility of conventional GPS L1 RF front-end to receive GIOVE-A El signal by evaluation of receiving performance of navigation signal on each bandpass filter of RF front-end.