골판지포장산업 분야의 Y2k 대응부문과 해결대책

우용한 한국골판지포장공업협동조합 1999 골板紙包裝ㆍ物流 Vol.6 No.28

AHP기법을 이용한 회전교차로 도입의 우선순위 결정에 관한 연구

우용한,김민석 한국ITS학회 2013 한국ITS학회논문지 Vol.12 No.6

최근 회전교차로가 많은 관심 대상이 되고 있지만, 추진과정에서의 명쾌한 판단기준과 도입의 우선순위에 대한 논리적인 근거가 많이 부족한 실정이다. 따라서 지방자치단체에서는 회전교차로 도입의 우선순위를 결정하는 과정에서 정책결정권자의 주관적인 판단에 의한 경우가 많다. 이러한 이유에서 본 연구는 회전교차로 도입의 우선순위 결정에 대한 하나의 방법론을 제시하고자 수행한 것이다. 평가항목으로는 교차로사고유형 등 6개 상위항목을 설정하였고, 각 항목마다 3개씩의 하위항목을 설정하였다. 각 평가항목에 대한 중요도를 분석하기 위해 업무담당 공무원그룹과 전문가그룹을 대상으로 총 53명에 걸쳐 설문조사를 실시하였다. 분석에 적용한 이론적 배경은 다기준의사결정법 중 Saaty가 제안한 AHP기법을 적용하였으며, 프로그램은 ‘Expert Choice 2000’을 사용하였다. 분석사례로 선정한 교차로는 다양한 상황을 대표할 수 있는 5개소로 결정하였다. 회전교차로 도입의 우선순위뿐만 아니라 가중치의 변화를 통해서 우선순위가 어떻게 변화하는지를 파악하기 위해 민감도분석도 함께 실시하였다. 이 결과로부터 다른 지역에서 인위적으로 현장상황을 변화시킴에 따라 우선순위가 어떻게 변화하는지도 추정할 수 있다. Roundabouts are recently paid a lot of attention, but in the process of implementation, there are insufficient logical grounds for clear criteria and priority of introduction. As a result, in determining priority of introduction of roundabouts, a local government often depends on a policy maker’s subjective judgement. Therefore, this study was conducted to suggest methodology for priority decision of introduction of roundabouts. Assessment elements of six main elements including accident type at intersections and each one has three subelements. Survey was carried out targeting fifty-three public officials in charge and experts in order to analyze the significance of each assessment element. The theoretical background of analysis is based on AHP developed by Saaty, which is one of multiple criteria decision making methods. ‘Expert Choice 2000’ was used as a software program. Five intersections representing different situations were selected as examples of analysis. It was also paired with sensibility analysis to grasp how priority might be changed by different weight. Through this result, it can be inferred that priority might change by manipulating field situation from other areas.

에너지 & 안전

우용한 한국에너지기술인협회 2002 한국에너지기술인협회보 Vol.8 No.-

타이어 흔적(Tire Mark)에 대한 용어개념

우용한 대한교통학회 2007 교통 기술과 정책 Vol.4 No.2

도로를 통행하는 차량은 도로 위에 어떤 형태로든 흔적을 남긴다. 특히, 비상시에 나타난 흔적은 당시의 차량 행태를 해석하는데 있어 아주 중요한 단서가 된다. 흔적을 대개 3가지 형태로 구분하면 스키드마크와 스카프마크, 프린트마크가 있다. 스키드마크는 우리가 흔히 볼 수 있는데, 구르던 차량의 바퀴가 잠길(Locking)때 도로상에 미끄러지면서 나타나는 타이어 흔적이다. 급제동과 관련된 현상인데, 운전자의 운전특성, 도로 및 차량의 상태, 타이어의 공기압에 따라 다르게 나타난다.

신호최적화모형의 개발과 적용성 평가

禹容漢,金載錫 경일대학교 2001 論文集 Vol.17 No.-

The signal operating plan must be established by the relationship between arrival volume and capacity at signalized intersections. In non-congestion state minimize the cycle and the green time shared by portion of arrival volume of each approach. In over-saturated state minimize queue length by phase is very important. So this study developed simulation model under these basic concepts. Optimal green time was decided according to traffic volume changes. And optimal cycle was selected as minimum surplus green time. Queue dissipated time and average delay time was used as evaluating index. Developed model in this study revealed useful and has high accuracy by comparing T7F model and observation value.

신호교차로의 전적신호 적용방법 연구

우용한,유영근,이상혁 한국ITS학회 2017 한국ITS학회논문지 Vol.16 No.5

신호교차로에서는 교통량과 보행자를 고려해서 현시별 녹색시간이 결정된다. 하지만 부적 절하게 설계된 신호운영체계는 차량과 보행자의 통행에 불편을 초래하고 있다. 본 연구에서 는 보행자의 안전을 확보하면서 차량 통행에도 문제가 없는 전적신호의 적용방법을 제안하 였다. 기본개념은 각 현시별 녹색시간중 여유녹색시간을 전부 합해서 전적신호 운영 여부를 판단하는 것이다. 즉, 총 여유녹색시간이 전적신호 현시시간보다 클 경우 전적신호의 적용이 가능하다. 이 방법에 의거 사례연구를 수행하였으며, 그 결과는 만족스럽게 나타났다. Intersection signal's phase time is calculated and determined by car and pedestrian traffic volume. If signal phase time and traffic volume dis-matched, cars and pedestrians have much delay time. This paper suggested an All-Red phase application method that cars and pedestrians securing safety and minimizing traffic signal waiting time. The key solution of this suggested method is determining All-Red phase operation by using sum of spare green time that have no passing cars. That is, total time of spare green time that have no passing cars is longer than All-Red phase time, operating All-Red phase has an effect. And case study carried out at the signalized intersection, revealed that this suggested method has much effectiveness.

딜레마 區間의 解消를 爲한 適正 黃信號時間 算定에 關한 硏究

金載錫,禹容漢 慶一大學校 1995 論文集 Vol.12 No.2

The signal intersection in the downtown has advantage in processing complex multi-directional traffic flows by giving them green one after another. But inefficient signal operation system reduces the capacity of that, and is apt to cause traffic accidents. Therefore, it is very important to optimize the signal operation system in signal intersection, and yellow time optimization, one of those optimization, can have great effect on reducing the possibility of traffic accidents. Short yellow time causes Dilemma zone, which is major factor of traffic accidents. In this study, as a case study to improve this phenomena, we analyzed the vehicle stop pattern at the beginning of yellow time from two approaches in two intersections. From that, we caculate the Dilemma zone of approaches, and estimated optimal yellow time to dismiss the Dilemma zone using speed, deceleration, crossing distance in the intersection.

飽和交通流率 算定方法에 關한 硏究

金載錫,禹容漢 慶一大學校 1997 論文集 Vol.14 No.2

For the purpose of calculation for capacity of signal intersection, we should analyze saturation flow rate on each movements. The method of calculation for a saturation flow rate that is proposed from HCM is difficult to deal because calculates so many adjustment factors. Therefore this study proposes 4 methods that calculate saturation flow rate simply. The proposed methods are the method on regression model, the method on saturation headway, and supplements the methods that consider rate of heavy vehicles or not. At last this study compares the results on 4 methods through case study.

交通量의 水準에 따른 車頭時間分布의 解析

金載錫,禹容漢 慶一大學校 1999 論文集 Vol.16 No.3

Time headway distribution that consists of the levels of traffic flow shows different pattern. Time headwsay has generally great value on the free flow, otherwise a large number of vehicles travel in minimum time hadway as far as possible on the congestion flow. These facts are investigated on time headway distribution, therefore this study is executed to define suitable distribution for each levels of traffic flow. The results of analysis with measured time headway, Pearson TypeⅢ Distribution is suitable for free flow - traffic volumes are 20~39(veh/2min), and Log-normal Distribution is suitable for congestion flow - traffic volumes are 40~69(veh/2min).

連續流에 있어서 車輛郡의 解所에 關한 硏究

金載錫,禹容漢 慶一大學校 1996 論文集 Vol.13 No.2

This study attempt to analyze platoon that is generated by increment of traffic volume on uninterrupted flow of provincial road. It is the critical headway on traffic flow that is analyzed by surveying headway and travel time according to arriving vehicles. Moreover, find out the critical headway at platoon is formed and propose correlation model on space mean speed. The consequences of this study can optimize road operation by the proposal of the relation between critical headway and space mean speed, and can apply to establish the plan of maximizing traffic capacity.