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      • Linear Approximation Techinques for The Discrete Network Design Problem

        李仁遠 弘益大學校 1981 弘大論叢 Vol.13 No.-

        자유로운 선택행위가 보장되는 상황하에서 네트워크의 설계는 Linear Programming과 같은 단일목적 함수의 연속변수 선형모형으로는 접근하기 곤란하다. 따라서 決定變數空間(Desion Space)을 (0.1)과 같은 定數로 놓고 비선형, 다목적 함수의 Integer Programming이 활용되어야 하겠는데 이때 야기되는 계산 작업의 기하급수적 증대가 문제로 제기되고 있다. 본 논문은 교통네트워크 설계에 사용되는 비선형 정수계획기법 알고리즘 중에서 Branch and Bound Algorithm을 선택하여 Upper Bound와 Lower Bound를 네트워크 대안이 변할 때에도 매번 되풀이 계산하지 않는 방법 즉 선형근사 해법을 이론적으로 개발 제시하였다. 특히 지하철 네트워크 설계화 같은 실무적인 문제를 예제로하여서 이용자잉여(Consumer's Surplus)가 로짓 형태의 수요함수 (Behavioral Joint Choice Logit Model)에 따라 결정될때 UPTS와 같은 교통 네트워크평가 모형을 매번 작동(Computer Run)하지 않고서도 최적해를 찾는 방법이 제시 되었으며 도시가로망과 같이 용량과 통행량, 통행시간과 통행 경로가 상호 밀접하게 영향 받을 경우 (Capacity Restraint Case)에 관하여서도 일반화된 근사해법이 제시 되었다.

      • 사회간접자본시설에 대한 분석방법의 개선방안

        李仁遠,朴魯峰,李誠烈 弘益大學校 科學技術硏究所 2004 科學技術硏究論文集 Vol.15 No.-

        It is recognized that most of the countries face the lack of facilities of Social Overhead Capital (SOC) except well-developed countries. The national development is being deteriorated, in particular, by the problems of transportation facilities, such as congestion of the road, over-capacity of the system of transportation service in harbors, and airports exceeding the capacity. However, for expansion of the SOC there is need for a number of financial supports so that it is difficult for the government to accommodate necessary capitals in the Asian countries. This research is focusing on development of the assessment to resolve the problem of preferential treatment, which is not only a controversial issue in the national development but also a large obstacle for the expansion of the SOC through private capitals. The paper will carefully evaluate previous assessments for the business through private capitals. Furthermore, it will evaluate the problems of the previous assessments and try to suggest how to improve the assessments. Finally, it will examine new approaches, differences from previous methods and outcomes of the measures through case studies applied from suggested new approaches. I am looking forward to further researches in the SOC, adjusting these assessments.

      • KCI우수등재

        都市高速道路 램프미터링을 위한 進入極大化方案과 進出極大化方案의 比較 研究

        李仁遠,金大鎬 대한교통학회 1996 大韓交通學會誌 Vol.14 No.4

        The optimal solution obtained by a linear programming model is to maximize the ramp inflow rate. It is argued in this paper that the maximization of inflow rate is different from the maximization of outflow rate under congested conditions. Therefore, this paper proposes a systematic searching procedure from a linear programming formulation to a integer programming: first obtain the optimal solution by a linear programming and then adding weight to linear programming then, solve the optimal solution again by integer programming i.e, The proposed method is an iterative searching approach. Measures of effectiveness by simulation models regards the real time data (O/D, queue, delay, etc), can be utilized in the proposed iterative process.

      • KCI우수등재

        Stochastic Dynamic Assignment 모형의 개발과 활용

        이인원,정란희 대한교통학회 1993 大韓交通學會誌 Vol.11 No.1

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        A formulation of dynamic traffic assignment between multiple origins and single destination was first introduced in 1987 by Merchant and Nemhauser, and then expanded for multiple destination in the late 1980's (Carey, 1987). Based on behavioral choice theory which provides proper demand elasticities with respect to changes in policy variables, traffic phenomena can be analysed more realistically, especially in peak periods. However, algorithms for these models are not well developed so far(working with only small toy network) and solutions of these models are not unique. In this paper, a new model is developed which keeps the simplicity of static models, but provides the sensitivity of dynamic models with changes of O-D flows over time. It can be viewed as a joint departure time and route choice model, in the given time periods(6-7, 7-8, 8-9 and 9-10 am). Standard multinomial logit model has been used for simulating the choice behavior of destination, mode, route and departure time within a framework of the incremental network assignment model. The model developed is workable in a PC 386 with 175 traffic zones and 3581 links of Seoul and tested for evaluating the exclusive use of Namsan tunnel for HOV and the left-turn prohibition. Model's performance results and their statistical significance are also presented.

      • KCI우수등재

        도시고속도로 램프미터링을 위한 진입극대화방안과 진출극대화방안의 비교 연구

        이인원,김대호 대한교통학회 1996 大韓交通學會誌 Vol.14 No.4

        The optimal solution obtained by a linear programming model is to maximize the ramp inflow rate. It is argued in this paper that the maximization of inflow rate is different from the maximization of outflow rate under congested conditions. Therefore, this paper proposes a systematic searching procedure from a linear programing formulation to a integer programming : first obtain the optimal solution by a linear programming and then adding weight to linear programming then. solve the optimal solution again by integer programming i.e. The proposed method is an interactive approach. Measure of effectiveness by simulation models regards the real time data(O/D, queue, delay, etc), can be utilized in the proposed interactive process.

      • KCI등재

        곡류에서의Fusarium속 곰팡이 독소의 오염

        이인원,김진철 한국식품위생안전성학회 1993 한국식품위생안전성학회지 Vol.8 No.2

        Species of the genus Fusarium are worldwide in their distribution. They are saprophytes as soil inhabitants and parasites of cultivated plants. Some isolates of certain species car capable of producing mycotoxins. Mycotoxicoses, including moldy corn toxicosis, alimentary toxic aleukia, fusariotoxicosis, and rel mold disease are known to be associated with trichothecene-producing fungi. Historically severe epidemic of cereal scab occred in the southern part of Korea in 1963. The epidemic caused a social problem because of not only heavy economic losses but also mycotoxicoses to humans and farm animals. However the toxic principles were remained unknown until some publications in 1980's indicated that trichothecenes and zearalenone were major mycotoxins in Korea cereals contaminated with Fusarium moniliforme have been found to be associated with human and animal disease such as leukoencephalomalacia in horses, pulmonary edema in swine and esophageal cancer in humans. High concentrations of fumonisins have been detected in corn samples from high espohoageal cancer risk areas of South Africa and China. Thus fumonisins have been implicated in the etiolgy of human esophageal cancer in those high incidence countries. Recently increase of imported cereals from foreign countries demands to assess the safety of mycotoxins in Korea. The informations on the natural occurrence of mycotoxins are needed to solve the toxicological problems in humans and farm animals associated with the consumption of moldy cereals.

      • KCI우수등재

        도시 간선도로 교통류관리를 위한 교통모형의 개발 및 검증

        이인원 대한교통학회 1995 大韓交通學會誌 Vol.13 No.4

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        The elasticity of a model is considered most important. Without showing the proper elasticity any model cannot provide useful information for decision making. This paper demonstrates a macro model which can generate dynamic transport informations every 15 minutes. Without the Wardrop principles and the monotonicity assumptions for the link travel time and link volume relationship, the basic elements of this new modeling approache are composed of link density simulation, stochastic incremental route choice, departure time choice, destination choice and mode choice. The elasticity of the proposed model is examined based on elasticity equations and simulation results. Also the transferability from a mega city like Seoul to a big city like Daejon is demonstrated for the choice model. The issues centering around the dynamic relations among density(k), speed(u), and flow rate(v) are also discussed for the modeling of highly congested situations.

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