http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
EMTP-MODELS를 이용한 Multi-Agent System 기반의 주파수 계전 알고리즘 구현
李秉炫(Byung-Hyun Lee),呂相敏(Sang-Min Yeo),金喆煥(Chul-Hwan Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.12
The primary objective of all power systems is to maintain the reliability and to minimize outage time for fault or the others. The frequency relaying algorithm perceives a variation of system frequency and thereafter detects the unbalance between generation and load. A multi-agent system is composed of multiple interacting computing elements that are known as agents. In this paper, frequency relaying algorithm is designed by multi-agent system and is implemented by EMTP-MODELS. To verify performance of the frequency relaying algorithm based on multi-agent system, simulations by EMTP have been carried out.