• 대한교통학회지
• /
• 제29권6호
• /
• pp.107-116
• /
• 2011

본 연구에서는 수도권을 중심으로 구축 운영 중인 UTIS를 활용하여 버스의 서비스 개선 및 운행 효율성을 증진함과 동시에 일반 차량의 지체를 최소화하기 위한 버스 수요 기반의 TSP 제어 알고리즘을 개발하였다. 이를 위해 버스의 수요를 기반으로 버스 우선신호의 우선권 강도를 조정하는 알고리즘을 제안하였으며, 주도로의 버스 우선권 제공으로 인한 부도로의 지체 증가를 막기 위해 부도로의 포화도에 따른 우선권 강도를 조정하는 보상 알고리즘을 제안하였다. 또한 연구 결과를 CORSIM RTE를 활용할 HILS 기반의 평가시스템을 통해 효과 분석하여 현장의 적용 가능성을 검증하였다. 시뮬레이션 결과 버스의 통행시간은 10% 정도 개선 효과가 있었으나, 이 경우 전체차량의 제어지체에는 큰 영향을 받지 않음을 확인하였다. 이러한 연구 결과는 국내의 대중교통 활성화 정책에 기여할 것으로 기대된다.

• 한국자동차공학회논문집
• /
• 제22권5호
• /
• pp.126-135
• /
• 2014

This paper describes the development and verification of control algorithms for V2X and environmental sensor integrated intersection support and safety systems. The objective of the research is to develop core technologies for effective fusion of V2X and environmental sensors and to develop new safety function for intersection safety. One of core technologies is to achieve the improvement of GPS accuracy, and the other is to develop the algorithm of a vehicle identification which matches all data from V2X, vehicle sensors and environmental sensors to specific vehicles. A intersection optimal pass (IOP) algorithm is designed based on these core technologies. IOP recommends appropriate speed to pass the intersection in the consideration of traffic light signal and preceeding vehicle existence. Another function is developed to prevent a collision avoidance when car crash caused by traffic violation of surrounding vehicles is expected. Finally all functions are implemented and tested in three test vehicles. It is shown that IOP can support convenient and comfortable driving with recommending optimal pass speed and collision avoidance algorithm can effectively prevent collision caused by traffic sign violation of surrounding vehicles.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
• /
• pp.713-716
• /
• 2003

In recent, the contactless IC card is widely used in traffic, access control system and so forth. Contactless smart cards use a technology that enables card readers to provide power for transactions and communications without making physical contact with the cards. Usually electromagnetic signal is used for communication between the card and the reader. Contactless card is highly suitable for large quantity of card access and data transaction. And its use becomes a general tendency more and more because of the development of RF technology and improvement of requirement for user convenience. This paper describes the hardware module to process contactless protocol for implementation contactless IC card. And the hardware module consists of specific digital logic circuits that analyze digital signal from analog circuit and then generate data & status signal for CPU, and that convert the data from CPU into digital signal for analog circuit.

• 대한인간공학회지
• /
• 제28권3호
• /
• pp.63-71
• /
• 2009

A car navigation system as an in-vehicle route guidance information (RGI) offers a state-of-the-art technological solution to driver navigation in an unfamiliar area. However, the RGI is provided by some pre-determined options in terms of the interface between a driver and a car navigation system. Drivers occasionally pass the target intersection owing to non- or late- recognizing it. This paper is examined the position of driver's turn signal operation and intersection recognition approaching at the target intersection which is difficult to identify, as a fundamental research on developing the additional RGI connecting with the turn signal control. The field experiment was conducted to measure distances of the turn signal operation and the intersection recognition from the target intersection according to left turns, right turns, and landmarks at adjacent intersection. And glance behavior to the car navigation display was evaluated by using an eye camera. The results of the field study indicate that, most case of driving, drivers operate the turn signal until 40m to 50m before coming to the target intersection. The driving simulator experiment was performed to examine the effectiveness of providing the additional RGI when drivers did not operate the turn signal approaching at the target intersection based on the results of the field study. To provide the additional RGI is effective for the intersection identification and recognition, and expected to improve the traffic safety and the comfort for drivers.

• 대한교통학회:학술대회논문집
• /
• 대한교통학회 1995년도 제28회 학술발표회
• /
• pp.77-107
• /
• 1995

This paper documents the development of a fuzzy logic based incident detection model for urban diamond interchanges. Research in incident detection for intersections and arterials is at a very initial stage. Existing algorithms are still far from being robust in dealing with the difficulties related with data availability and the multi-dimensional nature of the incident detection problem. The purpose of this study is to develop a new real-time incident detection model for urban diamond interchanges. The development of the algorithm is based on fuzzy logic. The incident detection model developed through this research is capable of detecting lane¬blocking incidents when their effects are manifested by certain patterns of deterioration in traffic conditions and, thereby, adjustments in signal control strategies are required. The model overcomes the boundary condition problem inherent in conventional threshold-based concepts. The model captures system-wide incident effects utilizing multiple measures for more accurate and reliable detection, and serves as a component module of a real-time traffic adaptive diamond interchange control system. The model is designed to be readily scalable and expandable for larger systems of arterial streets. The prototype incident detection model was applied to an actual diamond interchange to investigate its performance. A simulation study was performed to evaluate the model's performance in terms of detection rate, false alarm rate, and mean time to detect. The model's performance was encouraging, and the fuzzy logic based approach to incident detection is promising.

• 한국환경과학회지
• /
• 제18권6호
• /
• pp.603-608
• /
• 2009

Activated sludge sewage treatment processes are difficult to be controlled because of their complex and nonlinear behaviour, however, the control of the dissolved oxygen level in the reactors plays an important role in the operation of the facility. For this reason, this study is designed to present a system which accurately measures DO, MLSS, pH and ORP in the aeration tank to alleviate situations above and provide the automatization of a sewage treatment plant (STP) using new DO control system. The automatic control systems must be guaranteed the accuracy. Therefore, the proposed automatic DO control system in this study could be commercial applications in the aeration tanks by means of operating cost analysis and user-friendly for operation and maintenance. We could get accurate data from the lab tank which has water quality checker because there was no vortex and air bubble during the measurement process. Improvement of confidence in the lab tank enabled effective and automatic operation of sewage treatment plants so that operation costs and manpower could be saved. If this result is put in place in every sewage treatment plant nationwide for practical purposes, it is estimated to cost 18.5 million dollars in installing the lab tank and to save 9.8 million dollars in management cost a year, except for cost saved by automation.

• 대한교통학회지
• /
• 제20권2호
• /
• pp.135-148
• /
• 2002

본 연구는 공간적 정보를 수집할 수 있는 영상검지기를 이용하여 대기길이를 산출하는 알고리즘을 개발하였다. 이 알고리즘은 접근로 상·하류부에 각각 영상검지기를 설치하여 대기길이를 측정하는 방법을 사용한다. 또한 산출된 대기길이를 기반으로 새로운 신호제어모형을 제시하였다. 특히, 대기길이 기반의 주기길이와 녹색시간을 산출하는 절차와 알고리즘을 제시하였다. 제시한 알고리즘에 대한 검증을 위해 네트워크 환경을 구축하여 시뮬레이션을 수행하였다. 그 결과, 제안 모형이 기존모형보다 운영효과가 높게 나타났다. 추가적인 연구로는 실시간 교통조건에 병행하여 본 알고리즘을 검증할 필요성이 있다.

• 대한토목학회논문집
• /
• 제26권3D호
• /
• pp.367-374
• /
• 2006

본 연구에서는 국내 철도건널목의 지장물 검지 시스템 및 차단제어 시스템의 운영현황을 살펴봄으로써 기존 시스템의 문제점을 보완할 수 있는 새로운 건널목 제어시스템 및 알고리즘을 제시한다. 국내 건널목 제어시스템의 경우 차량 및 지장물 검지를 통해 단순 입구측 및 출구측을 제어하는 방식으로서 도로 교통과는 연계를 하지 못하고 있는 실정이다. 또한 검지시스템과 차단시스템의 신호연계체계의 미비로 인하여 비효율적이며 안전성이 결여된 건널목 운영을 보이고 있다. 본 연구에서는 보다 효율적인 건널목 운영을 위하여 지자계 검지센서와 레이저 검지센서를 통합한 철도 건널목 지장물 진입위반차량 검지시스템과 4분할차단기 알고리즘을 제시하였고, 현장시험을 통하여 본 연구에서 제시한 알고리즘의 신뢰성을 검증하였다. 그 결과 본 연구에서 개발되어진 시스템들은 철도 건널목 제어기기들간의 상호연계가 가능하며, 동시에 차량운전자의 운행 형태를 고려한 차단제어 방식으로 열차와의 충돌사고를 예방할 수 있으리라 기대되어진다.

• 한국IT서비스학회지
• /
• 제16권4호
• /
• pp.223-234
• /
• 2017

The audible pedestrian signal (APS) is an add-on device which connects to the pedestrian signaling device and informs the contents and changes of the signaling by sound. It provides walking direction information of the pedestrian crossing so that the blind people can safely cross the pedestrian crossing. In an intersection where a plurality of audible pedestrian signal (APS) are installed at an intersection crosswalk, existing audible pedestrian signal (APS) operate simultaneously in the communication radius of a wireless remote controller, which may cause confusion for the blind people and the public may complain about the noise. In this paper, we developed a BLE (Bluetooth Low Energy)-based audible pedestrian signal (APS) system capable of supporting two-way communications with a smart-phone that can cross the intersection safely and improve the walking comfort and traffic safety for the blind people. The proposed method is a method in which the BLE beacon communication based audible pedestrian signal (APS) presents active service to the blind people, and the existing audible pedestrian signal (APS) is a way of requesting the passive service by the blind people with the wireless remote control by the unidirectional communication based on 358Mhz. The developed system is installed in the crossroad of Doma-dong, Seo-gu, Daejeon, and it is tested and operated by the blind people. The satisfaction evaluation and analysis of the audible pedestrian signal (APS) for the blind people have good results and are planned to be expanded in the future.

• 디지털융복합연구
• /
• 제12권6호
• /
• pp.259-264
• /
• 2014

디지털 컨버전스는 정보통신 영역에서의 단위 기술들의 융합을 통하여 나타나는 새로운 상품이라 할 수 있다. 이러한 컨버전스 시대상황에 맞추어 정부에서는 10개 산업 군을 포함하는 "2025년 ICT 수요조사"를 실시하였다. 본 연구에서는 스마트 시티의 하나의 구성요소인 스마트 모빌리티에 대해 기술하였다. 이러한 스마트 모빌리티의 중심 역할을 수행하는 지능형 교통 시스템은 도로, 차량, 신호시스템 등 기존 교통시스템의 구성요소에 전자, 제어, 통신 등의 첨단기술을 접목시켜 교통시설의 효율을 높이고 안전을 증진하기 위한 교통시스템을 말한다. 본 연구에서는 우리의 일상적인 생활 공간속에서 접하고 있는 지능형 교통시스템에 대한 해외 각국의 사례들에 대해 기술하였다.