• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1572-1581
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• 2011

Since 'The Act on Private Investment of The Infrastructure' was established in 1994, private investment as well as government's investment has been active on transport infrastructure. But investment of transport infrastructure has more risks than others due to overforecast of transport demand for ensuring project validity, and cost uncertainty arising from financial crisis, commodity prices and so on. In the case of Incheon international airport express, after 2 years and 6 months, Incheon international airport express is opened, Korail take over equity stake in private investor due to the problems of MRG(Minimum Revenue Guarantee) be contracted with private investor. Not only that, in other case of Yong-in light rail, it is ongoing for legal disputes between Yong-in local government and private investor on account of opening delaying. On current Investment Assessment System of Transport Infrastructure, Risk Management system on investment of transport infrastructure is inadequate because Sensitivity Analysis in economic efficiency have been performed on the simple method which only changes benefits, expense and social discount rate. For this reason, this study analyze risks for investment of transport infrastructure demand forecast, and rise to the management practice for every particular item.

• 농촌계획
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• 제14권3호
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• pp.27-36
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• 2008

Rapid increase of aging population and progressed migration from rural areas to urban areas have caused deficit of bus routes in local cities. This increasing burden of operation deficit affects the movement strategy of the transportation vulnerable who are using buses. Along with dramatically increased aging in Korea, there is an urgent need to implement a new method which can guarantee mobility rights of public transportation especially for the elderly. This study focuses on the case of Demand Responsive Transit(DRT) system that has been operating in America, Europe, Japan, etc. Kimhae(Sangdong-myeon and Saengnim-myeon) is selected as a study area. This study investigated the possibility of adopting DRT system on the perspectives of the consumer and provider by the analysis of traffic condition such as the number of transportation vehicles, present bus service and regulation and conduct of questionnaire survey which includes present bus service and DRT system and so on. In conclusion, DRT system in Kimhae city will reduce transport cost, increase affordability through the betterment of service level and secure mobility rights for the transportation vulnerable.

• 전기학회논문지
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• 제65권11호
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• pp.1793-1799
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• 2016

As one of the main trends in global industries is eco-friendly energy, the interest on Electric Vehicle(EV) has been increased. However, if large amount of EVs start to charging, it could cause rapid increase in demand power of the power system. To guarantee stable operation of the power system, those unpredictable power consume should be mitigated. In this paper, therefore, we propose a practical smart EVs charging scheme to prevent the rapid increase of the demand power and also provide load flattening function. For that we considered Time-of-Use(ToU) price and actual data such as driving pattern and parameters of distribution system. Simulation results show that the proposed method provides proper load flattening function while preventing the rapid increase of the demand power of the power system.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.440-443
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• 2005

The wide spread of internet business recently necessitates recommendation systems which can recommend the most suitable product fur customer demands. Currently the recommendation systems use content-based filtering and/or collaborative filtering methods, which are unable both to explain the reason for the recommendation and to reflect constantly changing requirements of the users. These methods guarantee good efficiency only if there is a lot of information about users. This paper proposes an algorithm called 'demand articulate & integration' which can perceive user's continuously varying intents and recommend proper contents. A method of knowledge classification which can be applicable to this algorithm is also developed in order to disassemble knowledge into basic units and articulate indices. The algorithm provides recommendation outputs that are close to expert's opinion through the tracing of articulate index. As a case study, a knowledge base for heritage information is constructed with the expert guide's knowledge. An intelligent recommendation system that can guide heritage tour as good as the expert guider is developed.

• Journal of Information Processing Systems
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• 제20권1호
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• pp.93-104
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• 2024

China is playing more predominant role in the liquefied natural gas (LNG) market worldwide and LNG import price is subject to various factors both at home and abroad. Nevertheless, previous studies rarely heed a multiple of factors. A time-varying parameter factor augmented vector auto-regression (TVP-FAVAR) model is adopted to discover the determinants of China's LNG import price and their dynamic impacts from January 2012 to December 2021. According to the findings, market fundamentals have a greater impact on the import price of natural gas in China than overall economic demand, financial considerations, and world oil prices. The primary determinants include domestic gas consumption, consumer confidence and other demand-side information. Then, there are diverse and time-varying spillover effects of the four common determinants on the volatility of China's LNG import price at different intervals and time nodes. The price volatility is more sensitive and long-lasting to domestic natural gas pricing reform than other negative shocks such as the Sino-US trade war and the COVID-19 pandemic. The results in this study further proves the importance of domestic natural gas market liberalization. China ought to do more to support the further marketization of natural gas prices while working harder to guarantee natural gas supplies.

• 사회복지연구
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• 제47권4호
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• pp.93-120
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• 2016

본 연구는 주민센터 사회복지공무원의 국민기초생활보장 수급자 관리를 통해, 지역에 따라 공공사회복지서비스 수요적 차원에서의 환경적 특성 차이와 공급적 차원에서의 서비스 질과 양에 어떠한 차이가 발생하는지 확인해 보고자 하였다. 이를 위해 본 연구에서는 서울시에서 수급자 비율이 높은 지역과 낮은 지역의 8개 주민센터에서 사회복지(주민생활지원)팀 소속 사회복지담당공무원 15인을 대상으로 면접조사를 실시하였다. 면접조사의 결과에 따르면, 지역에 따라 사회복지공무원 1인이 담당하는 국민기초생활보장제도 수급자 세대수의 차이(11-450세대)가 발생하였으며, 이를 바탕으로 사회복지담당공무원이 경험하는 부담의 형태나 내용도 다른 것으로 나타났다. 또한 주거형태, 민간자원의 활용 가능성, 방문상담이 현실적으로 어려운 이유, 일선담당자와 중간관리자의 사회복지전문성 등 사회복지서비스의 다양한 측면에서 지역적 차이가 발생하는 것을 확인할 수 있었다. 이와 같은 분석결과를 바탕으로 일선 공공사회복지서비스 전달에 있어, 특히 서비스의 질에 부정적 영향을 미칠 수 있는 요인들을 개선하기 위하여 구체적 방안들을 논의하였다.

• 한국정보통신학회논문지
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• 제8권1호
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• pp.88-95
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• 2004

기존의 Best-effort 응용을 위한 디스크 스케줄링 기법들은 멀티미디어 객체의 실시간성을 만족하지 못하며, 실시간 응용을 위한 디스크 스케줄링 기법들은 시스템의 처리율을 만족시키지 못한다. 따라서, 본 논문에서는 범용 운영체제에서 멀티미디어 객체의 주기적인 연성 실시간 요구와 비 실시간 서비스를 동시에 만족시키는 2 단계 디스크 스케줄링 기법을 제안한다. 제안하는 기법은 실시간 요구와 비 실시간 요구에 적절한 가중치를 부여하는 라운드로빈 기법에 기초하고 있다. 리눅스 커널에서의 실험 결과 실시간 태스크와 비 실시간 태스크 사이의 공정성이 보장됨을 확인하였다.

• Journal of the Optical Society of Korea
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• 제20권6호
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• pp.704-715
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• 2016

In this paper, we explore a low-complex bandwidth allocation (BA) scheme with multi-level service guarantees in VLC-OFDM systems. Effective capacity theory, which evaluates wireless channel capacity from a novel view, is utilized to model the system capacity under delay QoS constraints of the link layer. Since intensity modulation of light is used in the system, problems caused by frequency selectivity can be neglected. Then, the BA problem can be formulated as an integer programming problem and it is further relaxed and transformed into a concave one. Lagrangian formulation is used to reformulate the concave problem. Considering the inefficiency of traditional gradient-based schemes and the demand for distributed implementation in local area networks, we localize the global parameters and propose a quasi-distributed quadratic allocation algorithm to provide two-level service guarantees, the first level is QoS oriented, and the second level is QoE oriented. Simulations have shown the efficient performance of the proposed algorithm. The users with more stringent QoS requirements require more subcarriers to guarantee their statistical delay QoS requirements. We also analyze the effect of subcarrier granularity on the aggregate effective capacity via simulations.

• 한국한의학연구원논문집
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• 제8권2호통권9호
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• pp.47-65
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• 2002

This project is planned to grasp the present situation of traditional medicine part in our country and to study protection method about this by the intellectual property which is the international concerning point recently. Through this, we will be able to devise means to deal with protection method of traditional medicine being developed by WIPO now. Traditional medicine field In our country Is organized with specific condition separated into the part of institution and the part of non-institution. So, because of the closed peculiarity, we have experienced the difficulties to understand the real facts about traditional medicine. We cannot be indifferent to the matter anymore. Because the expectation of object people is high, we could expect the realization of research content. In 1 detail project, we investigated the situation of traditional medicine in our country through various collecting methods for excavation of oriental treatment technique and herb medicine which is worth protecting. With it, we sorted again into 56 kinds of 11 parts through analysis of validity in the way of oriental medicine. And we tried to link this up 2 detail project which is about legal and institutional guarantee concerning protection. furthermore, we tried to find approach ways for security of objectivity into 4 steps with the example of model disease. we could complete practical classification of traditional medicine in our country. In 2 detail project, we studied the protection method by the intellectual property through research result in 1 detail project. For this, we observed an outline of the intellectual property including a patent application analysis in folk traditional medicine part, and problems of traditional medicine protection and world trend by traditional knowledge protection tendency and the patent law In domestic traditional medicines, the aspects unprotectable with the patent law now were remained. So, we suggested supplementary plan. And we also suggested the freedom of utilization between traditional medicine possession countries (in-situ utilization) and the demand compensation payment for a third country (ex-situ utilization) in connection with international movement.

• 통상정보연구
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• 제13권4호
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• pp.275-295
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• 2011

신용장거래에서 은행이 신용장조건과의 일치성 여부를 심사할 때 비서류적 조건을 고려하도록 요구하는 시도는 신용장의 독립성의 원칙을 저해하여, 은행의 신용장거래에 따른 위험을 증가시킨다. 따라서 UCP500에서부터 신용장의 비서류적 조건은 무시된다고 규정하게 되었다. 단 ICC Position Paper No.3에 따라 신용장에 관련 서류가 요구되었다면 유효성이 인정되었다. UCP600도 UCP500과 마찬가지로 규정하고 있지만 UCP600에는 ICC Position Paper No.3이 적용되지 않으므로 비서류적 조건과 관련된 서류를 신용장에서 요구하였더라도 무시된다는 점이 다르다. 신용장거래에 UCP600이 적용된다고 하여 비서류적 조건이라고 하여 무조건 무시되지 않는다는 점에 유의하여야 한다. 국제표준은행관행에서는 비서류적 조건 중 서류조건으로 전환하기 어려운 것은 유효성이 인정되고 있다. 즉 각국의 판례에서 객관적 지표로서 결정될 수 있거나 개설은행 자신의 기록 또는 활동으로부터 확인할 수 있는 것은 비서류적 조건이더라도 유효성이 인정되고 있다. ISP98과 URDG758에서는 이와 같은 것을 비서류적 조건으로 보지 않는다고 규정하고 있다. 개설의뢰인은 신용장 개설을 신청할 때 비서류적 조건이 기재되지 않도록 유의하여야 한다.