• Title/Summary/Keyword: Economical Run

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Simulation of An Economical Run for High Speed Train (고속철도 차량의 경제 주행 시뮬레이션)

  • 황희수
    • Proceedings of the KSR Conference
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    • 1998.11a
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    • pp.161-168
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    • 1998
  • This paper presents an simulation methdology for determining an economical running pattern for a high speed train which minimizes energy consumption under an given trip time margin. The economical running pattern is defined with an economical maximum speed in traction phase, a speed at the end of coasting and a speed at the end of regenerative braking alone in braking phase. An economical run for subways is also described. As a case study, the simulation is carried out fer an economical run of high speed NamSeoul-Pusan line, and the results described. To do this, train performance simulation program is built and extended to be able to find an economical running pattern and then to simulate the defined economical run.

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Economical run strategy for Korea High Speed Train Prototype (한국형 고속전철 경제운전 전략)

  • Lee Tae-Hyung;Park Choon-Soo
    • Proceedings of the KSR Conference
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    • 2004.06a
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    • pp.1381-1385
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    • 2004
  • This paper presents a modelling methodology using fuzzy logic and train performance simulation for determining an economical running pattern for a high speed train which minimizes energy consumption under an given trip margin. The economical running pattern is defined with an economical maximum speed in traction phase, a speed at the end of coasting. As a case study, the simulation is carried out for an economical run of korea high speed train prototype, and the results of fuzzy model described.

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Development of Economical Run Model for Electric Railway Vehicle (전기철도차량 경제운전 모형 개발)

  • Lee Tae-Hyung;Hang Hee-Soo
    • Journal of the Korean Society for Railway
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    • v.9 no.1 s.32
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    • pp.76-80
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    • 2006
  • The Optimization has been performed to search an economical running pattern in the view point of trip time and energy consumption. Fuzzy control model have been applied to build the meta-model. To identify the structure and its parameters of a fuzzy model, fuzzy c-means clustering method and differential evolutionary scheme are utilized, respectively. As a result, two meta-models for trip time and energy consumption were constructed. The optimization to search an economical running pattern was achieved by differential evolutionary scheme. The result shows that the proposed methodology is very efficient and conveniently applicable to the operation of railway system.

Development of Economical Run Model for Electric Railway Vehicle using Genetic Algorithm (유전알고리즘을 이용한 철도차량 경제운전 모델 개발)

  • Lee, Tae-Hyeong;Park, Chun-Su;Choe, Seong-Hun;Kim, Seok-Won
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 2007.04a
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    • pp.364-366
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    • 2007
  • 본 논문은 철도차량이 주행하는 선로에 존재하는 수많은 곡선과 경사, 속도 제한 조건 때문에 열차성능해석 계산시 열차의 견인, 제동 특성이 비선형이기 때문에 해석적인 방법으로 해를 구하는데 어려움이 많은 경제운전 문제를 운행 시간 여유분을 고려하여 에너지 소비를 최소화하는 운전 모형을 제시한다. 경제운전모형을 한국형 고속열차에 적용하여 그 타당성을 입증하였다.

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Optimal Control Strategy of Korea High Speed Train Prototype for the Minimization of Energy Consumption (에너지소비를 최소로 하는 고속전철 최적제어 전략)

  • Lee Tae-Hyung;Park Choon-Soo;Seo Sung-Il;Kim Ki-Hwan;Shin Joong-Rin
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1385-1387
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    • 2004
  • This paper presents a modelling methodology using fuzzy logic and train performance simulation for determining an economical running pattern for a high speed train which minimizes energy consumption under an given trip margin. The economical running pattern is defined with an economical maximum speed in traction phase, a speed at the end of coasting. As a case study, the simulation is carried out for an economical run of korea high speed train prototype, and the results of fuzzy model described.

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Development of Economical Run Model for High Speed Rolling stock 350 experimental (한국형 고속열차 경계운전 모형 개발)

  • Lee, Tae-Hyung;Park, Choon-Soo
    • Proceedings of the KIEE Conference
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    • 2005.10c
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    • pp.238-240
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    • 2005
  • The Optimization has been performed to search an economical running pattern in the view point of trip time and energy consumption. Fuzzy control model have been applied to build the meta-model. To identify the structure and its parameters of a fuzzy model, fuzzy c-means clustering method and differential evolutionary scheme are utilized, respectively. As a result, two meta-models for trip time and energy consumption were constructed. The optimization to search an economical running pattern was achieved by differential evolutionary scheme. The result shows that the proposed methodology is very efficient and conveniently applicable to the operation of railway system.

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Optimal Age Replacement Policy for a Repairable System with Increasing Minimal Repair Times at Failure (수리시간이 증가하는 수리가능한 시스템에서의 최적 교체시간의 결정)

  • 차지환;이강현;김재주
    • Journal of Korean Society for Quality Management
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    • v.28 no.3
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    • pp.53-58
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    • 2000
  • In many cases, it is more practical and economical to repair a system than to replace the whole system or to perform a complete overhaul when it fails. The age replacement policy with minimal repair at failure is considered. The system is replaced every time its age reaches at $T_0$. For each intervening failure only minimal repair is done. The minimal repair times in a renewal period are increasing in the sense that the minimal repair times constitute a strictly increasing geometric process. The long-run expected cost rate Is obtained and the properties of the existence and the uniqueness of the optimal policy minimizing the long-run expected cost rate are derived.

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Purchasing Behavior of Outlet Store Patronage Consumers (상설할인매장애고자의 구매행동)

  • 구양숙
    • Journal of the Korean Society of Costume
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    • v.33
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    • pp.201-215
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    • 1997
  • The purpose of this study was to investigate the actual state and problems of outlet stores. And examine store attributes shopping orientations information sources according to demographic characteristics for outlet store patronage group. The questionnaires were administered to 400 women living in Taegu. The data were analyzed by using Frequency Percentage Factor Analysis MANOVA. The results of the study were as follows; 1) Outlet stores in Taegu area were run as the type of agency and dealt in most brands of their own companies, There were plenty of as-sortment and merchandise. The discount rate was 50-60% Stores' locations were scattered which made shopping environment incon-venient. 2) The store attributes were composed of five factors such as fashion & products diver-sity service store reputation convenience and price. Shopping orientation were com-posed of six factors such as self-confidence for shopping brand oriented store loyalty & near-store oriented economical self-assumed shopping and difficulty of choice. Information sources were composed of four factors such as print media & display personal information advertising and store visit. 3) There were significant differences be-tween patronage group and non-patronage group in store reputation service fashion & products diversity. Patronage group is more satisfied with these three factors. There were significant differences between patronage group and non-patronage group in brand oriented and economical Non-patronage group was more brand oriented and patronage group was more economical. There were significant difference between patronage group and non-patronage group in print dedia & display factos. Non-patronage group made more use of print media& display than patronage group as information sources. There were significant differences between patronage group non-patrpnage group in age marital status and levle of education.

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Water Environment Characteristics and Efficient Basin Management of Song Stream (송천유역의 수질환경특성 및 효율적 유역관리)

  • 허인량;신용건;이건호;최지용;김영진;정의호;정명선
    • Journal of Environmental Health Sciences
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    • v.27 no.2
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    • pp.51-59
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    • 2001
  • Song stream is located in the upstream of the Namhan River. Normal times, the stream flows down to the east sea through the drainage pipe but at rainy season, it flows to the Namhan River. There are large stock farm, leisure town and cultivated land in this basin. The pollutants from these contamination source cause eutrophication at lake Doam and deterioration of water quality in namdai stream. In this case, this study was carried out to evaluate water quality and environmental capacity as well as economical efficiency of each industry. The basin shape factor of subject stream was 0.315, slope is higher than usual basin. The BOD, T-N and T-P productive contamination loading from each contamination source was 2,690, 974 and 194 kg/day, respectively, and major contamination source was stock farm and cultivated land. Annual BOD, T-N, T-P distribution(median value) of Song stream showed 1.0~2.2 mg/L, 3.16~5.85 mg/L and 0.024~0.197 mg/L Doam lake showed 1.1~1.9, 2.51~3.89 and 0.042~0.114 mg/L, respectively. Being compared of water quality at main stream between past and present, it showed that the water quality has improved since last five years. BOD improvement rate was 8~50%. Run off loading of BOD, T-N, T-P was 366, 1129, 17.2 kg/day, and run off rate was 13.6%, 86.2%, 11.3% respectively. Finally, the result of productivity survey of each industry, leisure town, cultivated land and large stock farm was 118, 46, 50 billion won, per T-P 1kg productive, and productivity portion was 100, 39, 42% respectively, and the highest economical efficiency industry was leisure facilities.

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Treatment of Landfill Leachate by UV/TiO2/H2O2 System (UV/TiO2/H2O2 시스템을 이용한 매립지(埋立地) 침출수(浸出水) 처리(處理))

  • Kim, Sung-Joon;Moon, Jung-Uye
    • Journal of Korean Society of Water and Wastewater
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    • v.11 no.4
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    • pp.133-141
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    • 1997
  • In order to treat the landfill leachate, $UV/TiO_2/H_2O_2$ system connected with biological treatment was investigated, and proper pretreatment methods were examined to reduce the load on the system considering economical and technical efficiency. It was more profitable to put $H_2O_2$ into the system in the early stage for the sample which was treated with $H_2SO_4$ to decrease alkalinity and with $FeCl_3-6H_2O$ flocculation. Because the required reaction time run up by increasing $H_2O_2$ input amount, though the COD was reduced slightly, the optimal $H_2O_2$ input amount should be determined for the desired COD and the economical efficiency. The appropriate way to get the lowest COD in the shortest time was the method to treat the sample which was controlled to pH 3.5 after adjusting to pH 12 and put 500 ppm $H_2O_2$ into the system. In that case, to increase $H_2O_2$ input amount was not profitable for the system efficiency. The sufficient photocatalytic excited time was required to reduce the photocatalytic decomposition time for the sample which was gone through the alkali state.

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