• Title/Summary/Keyword: TCS System

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Seasonal Forecasting of Tropical Storms using GloSea5 Hindcast (기후예측시스템(GloSea5) 열대성저기압 계절예측 특성)

  • Lee, Sang-Min;Lee, Jo-Han;Ko, A-Reum;Hyun, Yu-Kyung;Kim, YoonJae
    • Atmosphere
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    • v.30 no.3
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    • pp.209-220
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    • 2020
  • Seasonal predictability and variability of tropical storms (TCs) simulated in the Global Seasonal Forecast System version 5 (GloSea5) of the Korea Meteorological Administration (KMA) is assessed in Northern Hemisphere in 1996~2009. In the KMA, the GloSea5-Global Atmosphere version 3.0 (GloSea5-GA3) that was previously operated was switched to the GloSea5-Global Coupled version 2.0 (GloSea5-GC2) with data assimilation system since May 2016. In this study, frequency, track, duration, and strength of the TCs in the North Indian Ocean, Western Pacific, Eastern Pacific, and North Atlantic regions derived from the GloSea5-GC2 and GloSea5-GA3 are examined against the best track data during the research period. In general, the GloSea5 shows a good skill for the prediction of seasonally averaged number of the TCs in the Eastern and Western Pacific regions, but underestimation of those in the North Atlantic region. Both the GloSea5-GA3 and GC2 are not able to predict the recurvature of the TCs in the North Western Pacific Ocean (NWPO), which implies that there is no skill for the prediction of landfalls in the Korean peninsula. The GloSea5-GC2 has higher skills for predictability and variability of the TCs than the GloSea5-GA3, although continuous improvements in the operational system for seasonal forecast are still necessary to simulate TCs more realistically in the future.

Development of Network-based Traction Control System and Study its on Performance Evaluation using Net-HILS (Net-HILS를 이용한 네트워크기반 구동력제어시스템 개발 및 성능평가에 관한 연구)

  • Ryu, Jung-Hwan;Yoon, Ma-Ru;Hwang, In-Yong;SunWoo, Myoung-Ho
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.5
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    • pp.47-57
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    • 2006
  • This paper presents a network-based traction control system(TCS), where several electric control units (ECUs) are connected by a controller area network(CAN) communication system. The control system consists of four ECUs: the electricthrottle controller, the transmission controller, the engine controller and the traction controller. In order to validate the traction control algorithm of the network-based TCS and evaluate its performance, a Hardware-In-the-Loop Simulation(HILS) environment was developed. Herein we propose a new concept of the HILS environment called the network-based HILS(Net-HILS) for the development and validation of network-based control systems which include smart sensors or actuators. In this study, we report that we have designed a network-based TCS, validated its algorithm and evaluated its performance using Net-HILS.

An Occupancy based O/D Data Construction Methodology for Expressway Network (고속도로를 대상으로 한 재차인원별 O/D 구축방법론 연구)

  • Choi, Keechoo;Lee, Jungwoo;Yi, Yongju;Baek, Seungkirl
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.30 no.6D
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    • pp.569-575
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    • 2010
  • The occupancy based O/D is essential for measuring efficiency of various transportation policies like HOV/HOT lane, ramp metering, and public parking station. There has been many studies on occupancy survey methodology and O/D estimation using TCS (Toll Collection System) data separately. The occupancy O/D estimation methodology using TCS data has not been attempted thus far. An overall process from data collection stage to the occupancy O/D estimation stage has been suggested. Field survey was performed at the northbound Seoul toll station of Gyeongbu Expressway by each 2 hours of AM peak, PM non-peak, PM peak, midnight periods on a day. The process of matching the TCS data and field survey data classified by tollbooth ID, car type/mode, and arrival time was also performed. One typical output of the results showed that the ratio of single occupancy vehicles bounding for Seoul during the AM peak amounted to 60%. With the key output of this study and the specific O/D estimation methodology suggested, the whole centroid-to-centroid occupancy O/D of the country could be available, and then various applications in which the occupancy information is required could be possible.

Driving Characteristics Classification of TCS Data Based on Fuzzy c-means Clustering Algorithm (Fuzzy c-means 알고리즘을 이용한 TCS 데이터 주행특성 분류 방법 연구)

  • Park, Won-Sik;Kim, Dong-Keun;Yang, Young-Kyu
    • Proceedings of the Korea Information Processing Society Conference
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    • 2009.04a
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    • pp.1021-1024
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    • 2009
  • 현재 사용되고 있는 통행시간 분류방법은 하나의 통행시간을 대푯값으로 가지고 있다. 이에 문제점은 고속도로 특성으로 규정 속도 이상의 속도로 주행하는 차량, 규정 속도 및 휴게소 이용차량, 운전자의 운전 습성, 통행 목적, 피로의 정도, 운전자 성향과 도로상황에 따라 통행시간이 다르게 나타나는 점이다. TCS(Toll Collection System) 자료는 고속도로의 다양한 특성이 포함되어 있으며, 대상 구간의 거리가 멀수록 목적지에 도달하는 통행시간의 분산이 커지는 특성 또한 보인다. 따라서 이를 처리하기 위한 효율적인 통행시간 분류, 구간대표통행시간 추출 알고리즘이 필요하다. 기존의 방법은 전체 통행차량의 통행시간을 감안한 방법으로 통행시간 예측시 정확성이 저하된다. 본 연구에서는 TCS 자료를 Fuzzy c-means 알고리즘을 이용하여 일일 고속도로 통행시간의 시간별 주행특성을 고려한 대푯 값을 추출하는 알고리즘을 제안하였다. 실제 서울-청주 구간을 운행한 TCS 자료를 가지고 실시한 실험으로, 주행특성 및 도로상황을 고려한 Fuzzy c-means를 이용한 통행시간 분류방법과 기존의 통행시간 분류 방법을 통한 통행시간을 PIFAB를 사용 TCS 자료의 실제 통행시간과 경로통행시간을 비교 평가하였다. 평가한 결과 본 연구에서 제안하는 Fuzzy c-means기법은 기존 방법인 MAD기법보다 75%, 신뢰구간(95%) 추출법 대비 81%의 정확성을 제고하였다.

Development of the Train Control System Functional Requirements Specification using Use Case (Use Case를 활용한 열차제어시스템 기능요구사양서 개발)

  • Yoon, Yong-Ki;Hong, Jin-Ki;Kim, Yong-Kyu
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.1156_1158
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    • 2009
  • A train control system(TCS) becomes a large scale and complex as other computer based control systems. So, it is necessary to manage rigorously system requirements specification of the train control system at the early phase. This paper describes Use Cases and activity diagrams of the TCS functions requirements of TCS. Basic functions of the train control system suggested refer to IEC62290-1. And the basic functions includes train operation without a driver.

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Development of Hardware-in-the-loop Simulator for TCS (TCS를 위한 HIL 시뮬레이터 개발에 관한 연구)

  • 서명원;이한주;박윤기
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.5
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    • pp.194-205
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    • 1999
  • The prevalence of microprocessor-based controllers in automotive systems has greatly increased the need for tools which can be used to validate and test control systems over their full range of operation. The objective of this paper is to develop a real time simulator of traction control system by the methodology of using hardware-in-loop simulation based on a personal computer. By use of this simulator, the analysis of commercial electronic control units and components for TCS were performed successfully. The simulator of this research can be applied to development of more advanced control systems(suck as vehicle dynamics control system) and other automotive system.

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Travel Pattern Analysis Using TCS Data and GIS in Korea (TCS 자료 및 GIS를 이용한 한국의 통행패턴 분석)

  • Kim, Jae-Hun;Chung, Jin-Hyuk;Choi, Min-Hwan;Chang, Hoon
    • Journal of Korean Society of Transportation
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    • v.26 no.3
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    • pp.75-84
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    • 2008
  • In 2002, the 5-day workweek policy was effective in Korea. As we have expected, the 5-day workweek policy has changed people's travel behavior during weekdays and weekends. Several studies have been done to understand these changes and impacts on transportation systems. However, these studies have only focused on travel pattern changes without considering spatial factors. Said in another way, although individual travel pattern changes are usually investigated, indices adopted cannot describe travel pattern changes in a proper way due to lack of the spatial distribution measure. This study aims to analyze travel change since the 5-day work week policy in effect using a new index (i.e. Travel Vector Index) developed in this study, which can explain travel pattern changes in terms of magnitude and spatial point of views. The new index uses a GIS technology and TCS (Toll Collection System) databases in Korea. The results in this study show that the index is very useful and reliable to measure the travel patterns changes. They are applied to TCS data set and the results show that the 5-day workweek policy significantly affects on travel behaviors.

An Allocation of Safety Integrity Level to Inductive Loop type Train Control System (유도루프식 열차제어시스템 안전무결성등급 할당)

  • Ryou, Sung-Kyun;Park, Jae-Young;Yun, Hak-Sun
    • The Journal of the Korea institute of electronic communication sciences
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    • v.8 no.12
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    • pp.1905-1910
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    • 2013
  • This paper demonstrates the result of Safety Integrity Level (SIL) allocation for IL-type Train Control System(IL-TCS), by applying the semi-quantitative approach. IL-type TCS is defined in this paper as the set of Hardware and Software ATS equipment, Track-side ATP equipment, On-board ATP equipment, Track-side ATO equipment, On-board ATO equipment. SIL allocation is performed for these constituent subsystems of TCS. Based on three principles of the semi-quantitative method, the SIL allocation process is performed for the subsystems composing TCS.

Study on the Speed Control Code Design for Fixed Block TCS (고정폐색 열차제어시스템 속도제어코드 설계에 관한 연구)

  • Lee, Kang-Mi;Shin, Kyung-Ho;Shin, Duc-Ko;Lee, Jae-Ho
    • Journal of the Korean Society for Railway
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    • v.15 no.1
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    • pp.37-41
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    • 2012
  • Kyung-Bu High Speed Railway is operated in train control system(tcs) of fixed block operated in a way of dividing track circuits into several blocks in accordance with operation circumstances such as rolling stocks, grade, curves and facilities. The TCS of fixed block system refers to a continuous train control system, which transfers operational information such as entry and exit speed, distance-to-go, and deceleration etc. into on-board train control equipment on the basis of block occupancy of a preceding train. It guarantees a safe operation of trains by giving an emergency braking order, in case that a train exceeds an entry and exit speed of a corresponding block. In this paper, we analyze the speed control code deducing in accordance with maximum operation speed and characteristics of rolling stocks by analyzing principles of generation of speed control code allocated in blocks for safe operation, then train operational efficiency was analyzed by means of analysis of operation headway in accordance with the deduced speed control code. This study will be used to design in case of getting an increase in speed for existing high speed line or new high speed line TCS.

WHEEL SLIP CONTROL WITH MOVING SLIDING SURFACE FOR TRACTION CONTROL SYSTEM

  • Chun, K.;Sunwoo, M.
    • International Journal of Automotive Technology
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    • v.5 no.2
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    • pp.123-133
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    • 2004
  • This paper describes a robust and fast wheel slip tracking control using a moving sliding surface technique. A traction control system (TCS) is the active safety system used to prevent the wheel slipping and thus improve acceleration performance, stability and steerability on slippery roads through the engine torque and/or brake torque control. This paper presents a wheel slip control for TCS through the engine torque control. The proposed controller can track a reference input wheel slip in a predetermined time. The design strategy investigated is based on a moving sliding surface that only contains the error between the reference input wheel slip and the actual wheel slip. The used moving sliding mode was originally designed to ensure that the states remain on a sliding surface, thereby achieving robustness and eliminating chattering. The improved robustness in driving is important due to changes, such as from dry road to wet road or vice versa which always happen in working conditions. Simulations are performed to demonstrate the effectiveness of the proposed moving sliding mode controller.