• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1997.10a
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• pp.91-96
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• 1997

기존의 교통 신호처리에 있어서는 교차로를 통과하는 차량의 숫자만으로 교통량의 많고 적음을 표시하였으나 정확한 교통 신호 처리에 있어서는 상대교차로의 지연차량수, 진입로의 길이 및 폭등이 고려되어야만 지체시간을 줄이는데 효과적임을 알 수 있다. 본 논문에서는 정확한 교통제어를 위해 진입로의 길이와 차량의 형태등을 고려한 도로상의 점유정도를 퍼지센서 알고리즘을 통해 혼잡량이라는 새로운 상징적 값으로 도출하고 실시간 구현을 위해 룩업 테이블 방식의 퍼지하드웨어를 구성하여 기존의 교통신호 처리 제어와 비교하여 차량 지체시간이 줄어듬을 보였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.9
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• pp.578-589
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• 2014

In this paper, we introduce the concept of cyber-physical intersection systems (CPIS) which interconnects roadside units (RSU) located at the intersection, on-board units (OBU) of moving vehicles, and the smartphone apps, named the Smartphone Agent (SA). At the pedestrian mode of the SA, the connectivity management schemes, such as a location update and a handover control algorithm, are proposed to better support the CPIS services while minimizing the power consumption of the pedestrian's smartphone. We develop a real prototype of the CPIS, including RSU, OBU, and the SA. Based on the numerical results collected from a pedestrian moving around the Pusan National University campus, we validate that the proposed connectivity management schemes can improve not only the power efficiency of the pedestrian's smartphone, but also the quality of the CPIS services.

• Journal of Korean Society of Transportation
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• v.19 no.1
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• pp.115-129
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• 2001

The purpose of this study is to develop a cycle-free signal timing model for minimizing delays based on Third-generation control concept using Genetic Algorithm. A special feature of this model is its ability to manage delays of turning movements on the cycle basis. The model produces a cycle-free based signal timing(cycles and green times) for each intersection to minimize delays of turning movements on the cycle basis. The performance of cycle-free signal timings was evaluated on normal (v/c = 0.7) and oversaturated (v/c=1.0) conditions. The performance measures are throughput and the number of queued vehicles at the end of green time. The result shows that the cycle free signal timing is superior to the fixed signal timing to manage traffic flows of intersections; (1) the proposed model accomplishes the basic objective of the research, producing cycle free signal timings on the cycle basis, (2) on normal conditions, cycle free signal timings produce less queued vehicles at the end of green time, and (3) on oversaturated conditions, the cycle free signal timing is superior to the fixed signal timing to manage saturated traffic flows of intersections.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.11 no.5
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• pp.1-6
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• 2012

Unlike the past, modern urban intersections have dramatic growth in size and utilizations. As a result, continual traffic signal control is essential. Hence the individual or regional electrical blackout may bring about uncontrollable traffic congestion. Late summer of 2011 a regional blackout brought about traffic nightmare not including time and revenue loss associated with this disaster. Due to this disaster our national police agency and other government agencies are in process of introducing an UPS (uninterruptible power supply) system into essential intersections. This study estimates the power consumption necessary to sustain at least 2 continuous hours for a standard four-legged intersection. Prototype was studied using these standards. The field experiment of prototype showed positive results and was able to meet standard guidelines set forth. Prototype tested was able to meet standards in medium to large capacity of traffic size.

• 한국ITS학회:학술대회논문집
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• 2003.11a
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• pp.116-121
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• 2003

• Proceedings of the KOR-KST Conference
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• 2007.05a
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• pp.295-299
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• 2007

• Proceedings of the KOR-KST Conference
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• 2007.05a
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• pp.343-351
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• 2007

• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.511-513
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• 2001

지능형 교통 시스템(ITS)은 1) 도로의 상황 분석과 2) 위반 차량의 검지를 자동으로 수행하여 원활한 교통 제어를 제공하는 목적을 가지고 있다. 본 논문에서는 교차로에서 위반 차량을 검지하기 위하여 도로위의 차량 검지하고 차량의 진행 경로를 추적하는 기법으로 주간에는 배경 영상을 사용하지 않고 프레임간의 차를 이용하여 차량의 움직임 정보를 추출하고 야간에는 전조등을 검출하여 차량을 추적하는 기법으로 주간의 겨우 차량의 움직임만을 감지하므로 칼만 필터(Kalman Filter) 등에 의한 예측이 불가능하므로 현재 위치와 진행방향으로 움직임 정보를 추적하는 기법을 제안한다. 제안하는 기법은 주간 그림자의 영향과 야간의 난반사의 영향을 제거할 수 있고 입력 영상을 320x240으로 축소하여 초당 10프레임이상으로 처리하므로 정확한 차량의 움직임을 추적할 수 있다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.8 no.3
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• pp.52-63
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• 2009

Recently in Korea, in the case of metropolis, the urban signalized intersections are controlled by traffic information center or ITS center. Cheon-an City also established traffic information center through the 1st.-$\sim$3rd. ITS public construction and has managed this center that includes bus information service, traffic information collection and providing service, parking information service, and traffic responsive control system. In the Cheon-an metropolitan traffic signal operation, traffic signal controllers were grouped by the each main traffic flow axes and performed with coordinated signal timing for the signalized arterials, and also cycle and split changed by realtime traffic demands. Cheon-an urban traffic responsive control system was evaluated by intersection delay and speed, then it was verified that the delay decreased and vehicle speed improved. However, the rural signal control system to connect adjacency town was evaluated to have lower status than urban area due to the unimproved TOD (Time of day) plan. Therefore actuated signal control was examined for substitutive control system in isolated signal intersection. The aim of this article is to compare actuated signal control with TOD mode in the rural intersection of Cheon-an and to fine superiority of these two control mode, with evaluation of vehicle delay by using HCM(2000) method and by micro-simulation CORSlM. The result of field test show that actuated signal control gave better performance in delay comparison than the existing TOD signal control. And simulation outcome verified that non-optimized TOD has higher delay than optimized TOD mode, non-optimal actuated mode, and optimal actuated signal control mode. Particularly, these three modes delays had not different values according to the paired sample t-test. This is because small traffic demands were loaded in each links. This suggested actuated signal control is expected to be more effective than TOD mode in some rural isolated intersections which frequently need to survey for traffic volume.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.12 no.6
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• pp.127-136
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• 2013

In order to improve the safety and efficiency of traffic signal operation, several core projects of advanced transportation operating systems were implemented in Changwon City. This project included 10 units such as the expansion of roundabout, the permitted left-turn signal operation and the effectiveness of the projects was assessed using before and after studies. This paper presented the quantitative and qualitative evaluation results for three projects: roundabout, permitted left-turn signal operation, and left-turn actuated signal operation. From the analysis results, average travel speed was improved by 16.8% from the installation of roundabouts and average travel time and control delay were reduced by 12.4% and 41.6% respectively, from permitted left-turn operation. It was found that average control delay was reduced about 26.7% from left-turn actuated signal operation. In addition, more than 57.7% of the surveyed people was satisfied with the operational performance of the roundabout implemented. It is expected that the operational performance of traffic signal can be greatly improved by incorporating the proper projects of advanced transportation operating systems in other cities.