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미시 교통 시뮬레이션을 활용한 실시간 교차로 이동류 교통량 계수 시스템 개발
양인철(Inchul Yang),전우훈(Woo-Hoon Jeon) 한국디지털콘텐츠학회 2021 한국디지털콘텐츠학회논문지 Vol.22 No.5
Multiple movement traffic flows exist in a road intersection, and each flow has its own characteristics such as flows, speed, and density. Among them, traffic flow is an important feature widely used in traffic signal control and vehicle queue estimation, and its utilization is expected to growing in the area of future transportation system including autonomous vehicles, cooperative intelligent transport systems (C-ITS). Thus, we develop a real-time movement traffic flow counting system in a road intersection using micro traffic simulation. Firstly, movement traffic flow is defined and the requirement of the counting system is analyzed. Based on the analysis the system is carefully designed and proposed. The system is developed using VISSIM, micro transportation simulatioin with Python API, and its performance is tested. The proposed system can be used widely in the application development of autonomous vehicles and C-ITS.
절연보호막 처리된 Al - 1%Si 박막배선의 Electromigration에 대한 길이 의존성 및 Cu 박막배선의 Electromigration 저항성 변화에 대한 연구
양인철(I. C. Yang),김진영(J. Y. Kim) 한국진공학회(ASCT) 1995 Applied Science and Convergence Technology Vol.4 No.4
Al-1%Si 박막배선에서 수명의 길이 의존성 및 EM에 대한 저항성을 절연보호막 및 온도에 대하여 관찰하였고 ICB 증착된 Cu 박막배선의 EM에 대한 저항성을 측정하여 진공 열증착된 Cu 박막배선과 비교하였다. 첫째, 절연보호막 처리된 Al-1%Si 박막배선에서 길이가 200 ㎛에서 1200 ㎛로 증가함에 따라 전류인가에 의한 평균 수명과 활성화에너지값이 감소하다가 임계길이서부터는 모두 포화되는 것으로 나타났다. 절연보호막 물질에 상관 없이 고온으로 갈수록 임계길이가 짧아지며 그것을 넘는 영역에서는 길이에 대한 의존성이 약해져 임계길이 이상을 갖는 박막배선인 경우 평균수명 및 활성화 에너지값은 길이보다 막특성에 의존하는 것으로 사료된다. 둘째, ICB 증착된 Cu 박막배선의 d.c.인가에 따른 평균 수명은 진공 열증착된 Cu 박막배선보다 길게 나왔으며 electromigra-tion에 대한 활성화 에너지값도 1.70 eV로 1.33 eV보다 높게 측정되어 EM에 대한저항성이 증가한 것으로 나타났다. Length dependence of the lifetime and the EM resistance with the various dielectric passivation overlayers and the change of temperatures for Al-1%Si thin film interconnections were investigated. And the EM resistance of Cu thin film interconnections deposited by using ICB is compared with the EM resistance of Cu thin film interconnections by using thermal evaporation. First, the Mean-Time-to-Failure (MTF) and the activation energy are decreased until the critical length, that is, saturated point as the line length is increased from 200 ㎛ to 1200 ㎛ in Al-1%Si thin film interconnections with a dielectric passivation overlayer. The critical length is decreased as the temperature is increased showing no relation to the passivation materials, the MTF and the activation energy are dependent on rather thin film characteristics than line lengths in the region longer than the critical length for thin film interconnections. Second, the lifetimes of ICB deposited Cu thin film interconnections under an applied d.c. are observed to be longer than the lifetimes of thermal evaporated Cu thin film interconnections, and also the activation energy of ICB deposited Cu thin film interconnections of 1.70 eV which is larger than the activation energy of thermal evaporated Cu thin film interconnections of 1.33 e shows the stronger resistance to the EM in thin film interconnections.
차량센서 기반 교통상태 관측을 위한 통합 시뮬레이션 플랫폼에 관한 연구
양인철(Inchul Yang),전우훈(Woo Hoon Jeon),문재필(Jaepil Moon) 한국디지털콘텐츠학회 2020 한국디지털콘텐츠학회논문지 Vol.21 No.5
Probe vehicles equipped with automotive sensors observe and collect traffic conditions on the road on a real-time basis. These traffic condition observation technology should be developed with consideration of various kinds of sensors and dynamic road driving environment, and thus it is required to develop a simulation platform where the effective analysis can be done before developing a prototype. To this end, we proposed an integrated simulation platform architecture for traffic state observation using automotive sensors. The architecture is based on a traffic simulation model which works with an ITS-Station module, a utility module with coordinate conversion and location referencing method, a communication module and a central ITS-Station module, and API functions together with communication technology provides the information sharing capability. A test with real-world data was conducted to demonstrate the performance of the proposed architecture.
양인철(Inchul Yang),전우훈(Woo Hoon Jeon) 한국디지털콘텐츠학회 2020 한국디지털콘텐츠학회논문지 Vol.21 No.1
The location based system such as car navigation system and automated driving system matches its location in the road network map using GPS signals on a real-time basis. The basic map matching algorithm, however, runs slow due to its enormous computational complexity and repetitive attribute. Thus the efficient map matching algorithm was proposed using the trajectory of driving vehicles and the topology and direction of road links. Two sub-modules were proposed and included in the algorithm to reduce the number of links for the basic map matching process. The first is Buffered Boundary method, and the second is Driving Direction Comparison method. The performance test results in the Standard-ITS-Link road network demonstrated that the proposed algorithm outperformed the basic map matching algorithm.
양인철(Inchul Yang),전우훈(Woo Hoon Jeon) 한국디지털콘텐츠학회 2019 한국디지털콘텐츠학회논문지 Vol.20 No.7
A various type of road events such as work-zones, accidents, unexpected congestion, and potholes occurs everyday in the road, and it causes a serious traffic congestion and therefore threatens the road users’ safety. Many traffic experts have tried to estimate and predict the traffic conditions under such events, and to develop a traffic model which properly simulate the real world traffic flow change and thus help find a proper traffic operational strategy. Thus a micro traffic simulation model which simulates a temporary lane-close due to the road events was developed in this study. Some previous studies on the traffic simulation model were reviewed and its limitation was found. A new method using plug-in functions provided by the off-the-shelf simulation software program was proposed to tackle the limitation. A traffic model simulating the lane-close was designed, developed, and verified on a toy network. It was demonstrated that the proposed traffic model appropriately represents the real world lane-close phenomenon.