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N個 端子의 抵抗素子들로 構成된 回路에 있어서 非增幅特性의 硏究
李天熙 淸州大學校 1979 論文集 Vol.12 No.2
The well-known characteristics that networks of linear, positives resistors cannot amplify currents or voltage which are supplied by energy sources is shown to apply also to a class of non-linear, multi-terminal, resistive devices. The results of previous work are established and further extended by a very simple analysis procedure. The results are relevant to the behaviour of integrated circuits.
李天熙 청주대학교 산업과학연구소 1988 産業科學硏究 Vol.6 No.-
EDAS_P system is a personal CAE system for electronic circuits design, which is developed at ETRI. In this paper, we present the improved graphics functions of the EDAS_P system using the GSS*CGI on EGA card. There are two main differences of the existing facilities. The first one is the change of resolution from 640*200 to 640*35O. The second is the change of color from black /white to the 16 colors.
이천희,김호준,곽경섭 한국ITS학회 2014 한국ITS학회논문지 Vol.13 No.1
본 연구에서는 X-밴드 taper 슬롯구조 능동위상 배열 안테나를 구현하였으며, 구현한 안테나의 성능을 해석하고 측정을 통하여 분석하였다. 제작된 광대역 위상배열 안테나의 능동반사계수 및 능동복사패턴을 측정한 결과를 통하여 설계된 위상배열 안테나의 능동반사계수 및 능동복사패턴 결과와 일치함을 확인하였고, 안테나의 광대역 빔 특성을 검증하여 설계 목표에 부합하는 안테나 구조를 제안하였다. X-Band taper slot-typed active phased array antenna is studied and designed. Through the simulated and measured performances, it is confirmed that both of active reflection coefficient and active radiation pattern of the designed phased array antenna are agreed well with those of the prototype manufactured one. From this study, the proposed antenna structure is matched to the design target of characteristics of antenna's broadband beam.
Computer-Aided Design에 의한 Packaging 디자인에 관한 연구
李天熙 淸州大學校 1981 論文集 Vol.14 No.2
The recent technical advancements of printed wiring board design make the interconnecion density become higher and the designing cost of a digital system has become more expensive than that of its components. Therefore, an efficient automated design system of printed wiring boards is expected. In the assembly of such systems, PWB's are used very often to provide the necessary interconnection among circuit modules In this paper we describe the some kind of module placement method and routing system such as maze routing method, Line serch method, channel method.
신용평가에서 중소벤처기업 경영자 역량 요인의 상대적 중요도에 관한 연구
이천희,이동명,진로 한국디지털정책학회 2019 디지털융복합연구 Vol.17 No.4
This study is to provide a method to increase the credit rating of the company by examining and managing the executive competency of the CEO of SMEs and Venture Firms. We analyzed the importance and priority of AHP by surveying bank loan staff and CEOs. According to the analysis results, ethics management, strategic thinking, and expertise level were the highest in the relative importance of bank loan staff. The relative importance of CEOs was higher in order of marketing, bank transaction reliability, and financing. Result of this study is similar to the relative importance of the previous research. This study suggests to disclosing credit rating system and reflect the opinions of the CEO in order to protect financial consumers. The significance of this study is to present the factors and the importance that can help to develop advanced models. 본 연구는 경영자 역량에 관한 심층분석을 통하여 은행에서 경영자 역량을 보다 구체적이고 체계적으로 신용평가에 반영하고, 중소벤처기업 CEO는 경영자 역량을 스스로 점검하고 관리하여 기업의 신용등급을 높이는 방안을 제공하고자 한다. 은행의 대출담당자와 중소벤처기업 CEO를 대상으로 설문하여 중요도 및 우선순위를 AHP를 통해서 분석하였다. 분석결과를 보면 대출담당자의 상대적 중요도에서 윤리경영, 전략적 사고, 전문지식수준의 순으로 높게 나타났다. 중소벤처기업 CEO의 상대적 중요도에서는 마케팅, 은행거래신뢰도, 자금조달의 순으로 높게 나타났다. 본 신용평가에서도 선행연구의 상대적 중요도와 유사한 결과를 보였으며, 금융소비자 보호 차원에서 신용평가시스템을 공개하고 CEO의 의견을 반영하는 노력이 필요하다고 사료된다. 본 연구의 의의는 경영자 역량 요인의 상대적 중요도를 연구하여 향후 발전된 모형개발에 도움이 되는 요인과 중요도를 제시한 점에 있다.
Practical method to improve usage effi ciency of bike-sharing systems
이천희,이정우,정영준 한국전자통신연구원 2022 ETRI Journal Vol.44 No.2
Bicycle- or bike-sharing systems (BSSs) have received increasing attention as a secondary transportation mode due to their advantages, for example, accessibility, prevention of air pollution, and health promotion. However, in BSSs, due to bias in bike demands, the bike rebalancing problem should be solved. Various methods have been proposed to solve this problem; however, it is difficult to apply such methods to small cities because bike demand is sparse, and there are many practical issues to solve. Thus, we propose a demand prediction model using multiple classifiers, time grouping, categorization, weather analysis, and station correlation information. In addition, we analyze real-world relocation data by relocation managers and propose a relocation algorithm based on the analytical results to solve the bike rebalancing problem. The proposed system is compared experimentally with the results obtained by the real relocation managers.