• Title, Summary, Keyword: 정시성

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Analysis on Reliabilities of Seoul's Trunk Bus Lines Using BMS Data (through Data Envelopment Analysis) (BMS 자료를 이용한 서울시 간선버스의 정시성 분석(자료포락분석기법을 적용하여))

  • O, Mi-Yeong;Jeong, Chang-Yong;Son, Ui-Yeong
    • Journal of Korean Society of Transportation
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    • v.27 no.1
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    • pp.63-71
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    • 2009
  • The purpose of this paper is to identify unreliable routes in the view of users. After headway error ratio per route and travel time error ratio per route were calculated by using BMS data, reliability which incorporated two indicators each route was calculated through data envelopment analysis. Reliability among routes and among traffic zones was compared through the results, the needs to improve severely unreliable routes and to show passengers adjusted bus schedule information considering current reliability were suggested. As a future study, reliability evaluation framework of each route needs to be developed considering operation environment by analyzing bus card data (passengers and operation speed etc.) and pooly unreliable route should be managed strictly and reformed.

A Development of Punctuality Index for Bus Operation and Analysis of its Characteristics (버스 운행 신뢰성 평가를 위한 정시성지표의 개발 및 적용)

  • Go, Seung-Yeong;Park, Jun-Sik;Kim, Eun-Ho
    • Journal of Korean Society of Transportation
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    • v.23 no.2
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    • pp.131-142
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    • 2005
  • Punctuality of bus operation can be defined as "timely operation of buses according to their operation schedules." It tis often considered as one of the important measures of bus operation reliability in evaluating bus operation performance from the viewpoint of bus users. Passenger waiting times are severely influenced by the punctuality of bus operations. However, there exist many situations that predetermined schedules cannot be met. In these cases, other definitions of punctuality should be given. This paper is to develop punctuality indexes of bus operation based on various bus operating situations. Bus operation data sampled from Seoul bus system were analyzed to calculate punctuality indexes for a number of bus routes. Then, bus operation punctuality was characterized by various operating conditions. Several interesting results were obtained and explained.

A Development of Punctuality Index for Bus Operation Using Time-space Diagram (시공도를 이용한 버스운행 정시성 지표개발)

  • Yang, Ji-Young;Kim, Young-Chan;Kim, Seung-Il
    • Journal of Korean Society of Transportation
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    • v.23 no.8
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    • pp.129-138
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    • 2005
  • Since Successive introduction of BMS(Bus Management System) into the local governments has been able to collect each bus data on the road and valuate the bus operation by the quantitative index not qualitative index. we need a study on punctuality index for evaluation of service level for bus operation using bus location information. We propose punctuality index for bus operation using time-space diagram and valuate the index by application to real bus data.

Identifying Key Factors to Affect Bus Headway Deviation using Hierarchical Linear Model (Seoul Case Study) (HLM을 이용한 버스차두간격 편차에 미치는 요인분석 (서울시사례를 중심으로))

  • Lee, Ho-Sang;Kim, Do-Gyeong;Kim, Yeong-Chan;Hwang, Gyeong-Su
    • Journal of Korean Society of Transportation
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    • v.27 no.6
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    • pp.119-127
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    • 2009
  • It has been known that bus route and company related characteristics have influences on punctuality, but fewer research have been conducted. Independent variables used in this study were selected using correlation analysis, and OLS(Ordinary Least Square) and HLM(Hierarchical Linear Model) were employed to identify factors affecting bus punctuality(headway deviation). The results showed that ICC(intraclass Correlation Coefficient) is 0.10, indicating that hierarchical linear models are more adequate for these data because there is effective variation in the subjects between companies. Punctuality was found to be negatively associated with the number of vehicles, the number of persons per vehicle, and total travel time. On the other hand, average headway and company size have a positive relationship with punctuality. Therefore, the number of vehicles per route, average headway, and the number of vehicles managed by a company should be considered for more accurately evaluating the management of piunctuality.

Prediction of "Air-moving on Schedule" by Markov chain (마코프 체인을 이용한 항공운항의 정시성 예측)

  • Ha, Man-Seok;Namgung, Jung-Il;Park, Soo-Hyun
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.1299-1301
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    • 2015
  • 항공서비스에 있어서 여러 중요한 요소가 있지만 그 가운데 가장 중요한 요소로 운항의 정시성을 들 수 있다. 본 논문에서는 마코프 체인을 이용하여 항공사 및 공항의 정시성을 평가하고 예측하고자 하였다. 실험용 데이터로 선택한 미국 항공운항 데이터를 기상 악화에 따른 도착지연시간을 기준으로 정시성이 우수한 항공사를 제안하는 기능을 테스트하였다. 본 논문에서는 과거의 항공운항 데이터를 활용하여 미래의 운항 지연을 예측할 수 있도록 마코프 체인을 기반으로 한 예측 방법을 제시하였다.

불황기에 화물 배달의 정시성을 보증하는 'M'선사의 Daily Maersk Service 성과에 대한 사례 연구

  • Hwang, Jun-Ho;Jang, Myeong-Hui
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.63-64
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    • 2012
  • 2008년부터 시작된 세계경제 위축은 전 세계 해상물동량 감소로 이어져 컨테이너선업계의 불황이 더욱 심화되고 있다. 선사들은 불황을 극복하기 위하여 여러 가지 전략들을 구사하고 있다. 대부분의 선사들은 잉여 선박의 추가투입으로 감속운항을 통해 선박 운영비용을 절감하고 있는데, 이와 같은 시도는 선사입장에서는 비용절감이 되지만 감속운항이 화물의 정시성을 저해하는 요소로 작용하고 있기 때문에 화주입장에서는 불만요인이 될 수 있다. 이러한 상황에서 'M'선사는 "On Time Delivery"를 보증하기 위해서 아시아-유럽항로에서 새로운 서비스인 Daily Maersk Service를 2011년 10월부터 적용하고 있다. 본 서비스는 아시아발 북유럽행 특정 기간 포트구간 수송에서 100% "On Time Delivery"를 보증하고, 또한 매일 화물수탁을 가능하게 한 신서비스이다. 본 연구에서는 업계 1위를 달리고 있는 'M'선사가 감속운항을 하면서도 화물의 정시성을 높이기 위해 실시하고 있는 Daily Maersk Service를 통하여 가격 경쟁과 더불어 서비스 경쟁에서도 우위를 확보하려는 전략이 효과를 나타내고 있는 지에 대하여 사례연구를 통하여 확인하였다.

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A Study on the Factors Affecting the Stopping Time and Punctuality of Bus Stop: A Case of Bus Stop by Roadside Bus Only Lane (버스 정류장 정차시간 및 정시성에 영향을 미치는 요인에 관한 연구: 가로변 버스전용차로의 정류장을 중심으로)

  • JANG, Jae-Min;LEE, Young-Inn;LEE, Keun
    • Journal of Korean Society of Transportation
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    • v.35 no.3
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    • pp.234-246
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    • 2017
  • The Seoul metropolitan government introduced the bus information systems, bus rapid transit to increase travel speed and punctuality but still suffer from insufficiency. This paper delivers a study verifying the external factors at near the bus stops. The dependent variable was set to the standard deviation of (1) travel time and (2) travel time to and from the bus stop in this study. The independent variables were set to (1) the number of routes, (2) traffic volume by bus type, (3) the number of bus bays, (4) the possibility of passing, (5) the distance to crosswalks and intersections, and (5) the presence of residential road. The results showed that the most significant factors included the link section speed, number of bus bay, distance to crosswalk, and the possibility of passing.

Implementation of Memory controller for Punctuality Guarantee from Memory-Free Inspection Equipment using DDR2 SDRAM (DDR2 SDRAM을 이용한 비메모리 검사장비에서 정시성을 보장하기 위한 메모리 컨트롤러 구현)

  • Jeon, Min-Ho;Shin, Hyun-Jun;Kang, Chul-Gyu;Oh, Chang-Heon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.136-139
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    • 2011
  • The conventional semiconductor equipment has adopted SRAM module as the test pattern memory, which has a simple design and does not require refreshing. However, SRAM has its disadvantages as it takes up more space as its capacity becomes larger, making it difficult to meet the requirements of large memories and compact size. if DRAM is adopted as the semiconductor inspection equipment, it takes up less space and costs less than SRAM. However, DRAM is also disadvantageous because it requires the memory cell refresh, which is not suitable for the semiconductor examination equipments that require correct timing. Therefore, In this paper, we will proposed an algorithm for punctuality guarantee of memory-free inspection equipment using DDR2 SDRAM. And we will produced memory controller using punctuality guarantee algorithm.

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Evaluation of Metro Services based on Transit Smart Card Data (A Case Study of Incheon Line 1) (스마트카드 데이터를 활용한 도시철도 서비스 평가 (인천 1호선의 차내혼잡과 정시성을 중심으로))

  • Eom, Jin-Ki;Choi, Myoung-Hun;Kim, Dae-Sung;Lee, Jun;Song, Ji-Young
    • Journal of the Korean Society for Railway
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    • v.15 no.1
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    • pp.80-87
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    • 2012
  • This study analyzed the quality of a commuter rail service of Incheon line 1 with respect to two service measures such as occupancy (crowdedness) and punctuality based on transit smart card data collected in 2009. In order to analyze the metro services by individual fleet, we aggregated the personal level card data into the fleet operated in each planned schedule. The results show a low level of service for both crowdedness and punctuality during peak hours at the line segment from 'Gyeyang' to 'International business district'. Further, a close relationship between vehicle occupancy and punctuality is found, which illustrates high passenger demand causes successive metro delay.

Study on the Optimum Route Travel Time for Bus to Improve Bus Schedule Reliability (정시성 확보를 위한 버스노선 당 적정 운행시간 산정 연구)

  • Kim, Min ju;Lee, Young ihn
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.16 no.6
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    • pp.112-123
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    • 2017
  • The accurate forecasting of the public transportation's transit and arrival time has become increasingly important as more people use buses and subways instead of personal vehicles under the government's public transportation promotion policy. Using bus management system (BMS) data, which provide information on the real-time bus location, operation interval, and operation history, it is now possible to analyze the bus schedule reliability. However, the punctuality should always be considered together with the operation safety. Therefore, this study suggests a new methodology to secure both reliability and safety using the BMS data. Unlike other studies, we calculated the bus travel time between two bus stops by dividing the total travel length into 6 sections using 5 different measuring points. In addition, the optimal travel time for each bus route was proposed by analyzing the mean, standard deviation and coefficient of variation of the each section's measurement. This will ensure the reliability, safety and mobility of the bus operation.