• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.990-992
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• 2017

현재 버스 노선을 조사할 때 사용하는 방법은 특정 날짜에 조사원이 직접 버스에 탑승하여 조사하는 방법을 쓴다. 이 방법을 개선하고자 버스 출입구에 카메라를 설치하여 탑승자의 얼굴을 인식하고 인식한 얼굴들을 매칭 하는 방법으로 통계조사를 한다. 이러한 방법을 통해 버스 노선을 조사할 때 드는 비용과 시간을 절약하여 효율적으로 사용한다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.10 no.5
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• pp.14-22
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• 2011

This study is to estimate delay time model of signalized intersection by using travel data of Bus Information System. BIS, which applies the advanced information technology to an existing bus system, has been developing and operating in many cities. However, even though some useful traffic informations have been collected from BIS operation, utilization of real-time data to the traffic operation has not been promoted due to the inhomogeneity of modal speeds. Accordingly, in this study, a fundamental research is performed for traffic controls in urban areas and providing a traffic information throughout a methodology for estimating delay time using the data from BIS was developed. This delay time model setting bus travel time excluding service time of a bus stop as explanatory variables was constructed as a regression model, and the coefficient of determination of a linear regression model most highly appeared as 0.826. As a result of performing T-test with field survey values and model estimation values for verifying constructed models statistically, it was analyzed to be statistically significant in a confidence level of 95%.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10b
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• pp.475-477
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• 2001

본 논문에서는 버스에 설치되어 있는 비디오 카메라의 연속된 승차 영상과 추출해둔 배경 영상간의 영상차 분석을 통해 승객이 특정 구역을 통과하는 것을 감지하여 계수하는 방법을 연구하였다. 배경 영상은 운행 시와 같이 배경이 급변할 때는 연속된 두 프레임의 영상차를 이용하여 동적으로 배경 영상을 얻고 정차 시에는 배경 영상을 승차 영상과 비교하여 보정하여 주는 방법으로 최적화된 배경 영상을 얻어내었다. 본 시스템은 실제 상황에서 얻어진 비디오 영상에 적용하여 93.6%의 계수 성공률을 얻어내었다.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.170-172
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• 1999

본 논문은 실시간 시스템에서 중요한 요소인 타이머 운용에 관련된 방법중 Linux를 위한 접근 방법을 분석한다. 현재 표준 PC는 ISA 버스와 연결된 8254 프로그래머를 카운터를 통해 시스템의 시각부분을 처리하고 있다. 이 경우 ISA 버스의 특성상 10us (in PentiumPro 200MHz) 정도 소요시간을 가지게 된다. 보다 높은 microsec 수준의 실시간성을 요구하는 경우 이러한 근원적 시각처리 방안을 개선함은 필수적인 요소이다. 이를 위해 리눅스에 적용 가능한 타이머 운용방안 들로서 표준 8254 타이머, 펜티엄 프로세서의 TSC 이용방법 및 Intel SMP 보드의 APIC 타이머에 의한 방법들을 비교 분석하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.106-107
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• 2018

Since Many person go to work or get off, it is difficult to use the public transportation comfortably on the morning or the evening. In this paper, we implement the passenger notification system on the bus using the NFC. The implemented system counts the number of passengers with the NFC reader for the fare. The user is able to find out the crowds of the bus transferred from the server before hop-in.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.6
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• pp.1045-1054
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• 2006

In this paper, described a design result of bus interface modulo for multiple level MU-SID-1553 data bus network. In general, MIL-SID-1553 network is used for single level data bus topology. But, according to applied system's structure. multiple level bus architecture is required., And for his, micro processor must be involved for system be, and a additional hardware and software functions are needed. The designed data bus interface module is simply consists of communication transceivers and simple electronic circuit without micro processor. Through the hardware testing and software simulation, the functional performance of the designed interface module was successfully validated.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.5 no.2 s.10
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• pp.44-54
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• 2006

The share rate of bus mode has been decreasing continuously. To solve this problem, the local governments implement Bus Management System(BMS) or Bus Impormation System(BIS). In operating the public transportation preferential policy, it is very important to verify the effectiveness of the projects. This study performed the effectiveness of BMS through before and after study based on the field data. Moreover, this study analyzed the factors affecting to BMS. We anticipate that the results of this study would be useful reference in local government's BMS planning.

• Journal of KIISE:Databases
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• v.33 no.7
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• pp.655-667
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• 2006

Due to the rapid development in mobile communication technologies, the usage of mobile devices such as cellular phones and PDAs becomes increasingly popular. One of the best ways to maximize the usability of mobile devices is to make them aware of their current locations and the locations of other fixed and mobile objects. In this paper, we propose a cost-effective Bus Information System, ACE-BIS, which utilizes a mobile device to retrieve the bus routes to reach a destination from the current location. To accomplish this task, ACE-BIS maintains a small amount of information on bus stops and bus routes in a mobile device and runs a heuristic routing algorithm based on such information. When a user asks more accurate route information or calls for a 'leave later query', ACE-BIS entrusts the task to a server into which real-time traffic and bus location information is being collected. By separating the roles into a mobile device and a server, ACE-BIS is able to provide bus routes at the lowest cost for wireless communications, without imposing much burden to a server. The results of extensive experiments revealed that ACE-BIS is effective and scalable in most experimental settings.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.2
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• pp.597-604
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• 2014

In this study, we investigate to show the limitations of current bus arrival time estimation model based on each bus route, and to propose a bus arrival time estimation model based on a bus stop to overcome these limitations. Using the characteristic of bus arrival time calculated on travel time between two bus stops, we develop a model to estimate bus arrival times with the data of all buses traveling the same section regardless of bus route numbers. In the proposed model, an estimated arrival time is calculated by weighted moving average method, and verification between observed value and estimated time is performed on the basis of RMSE. Error was reduced by up to 20% compared to the existing models and the data update period was reduced by more than half that is related to the accuracy of bus arrival time information. We expect to solve the following problems with the suggested method: sudden increase or decrease in arrival time of the bus, the difference of the expected arrival times at the same stop between two or more buses having different route numbers, and impossibility of offering information of a bus if the bus is not operated with the designated schedule.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1055-1057
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• 2009

전력시스템은 발전에서 수요에 이르기까지 다양한 설비 및 기기들이 유기적으로 결합되어 있고, 모든 과정이 실시간으로 운영되고 있는 매우 큰 규모의 시스템이다. 전력시스템에 IT 기술이 접목되면서 다양한 구성요소 간에 수많은 정보교환이 요구되는 시점에서 각 운영시스템별 독립적인 필요에 의해 상이한 플랫폼으로 개발되었기 때문에, 시스템 상호간 연계와 원활한 데이터 교환 및 유통을 통한 전체 전력시스템의 최적화를 이루는 데까지는 도달하지 못하고 있다. 다양한 운영시스템 상호간 데이터 교환을 위한 표준화 요구에 부응하여, 향후 전력시스템은 표준화되고 공개된 정보모델을 활용한 전사적 통합시스템 개발이 요구된다. 본 논문에서는 전력운영시스템 데이터 교환을 위한 메시지 버스에 대하여 기술하였다. 서로 다른 운영환경에서의 단위 운영시스템들을 동일한 플랫폼으로 재구성, 재개발하는 것이 어려운 상황에서 전력시스템 내 유통정보를 총체적으로 관리하고 이를 필요로 하는 운영시스템에 효율적으로 제공할 수 있는 인프라의 구축은 미래의 전력시스템의 부가가치를 높일 수 있는 기반을 제공할 것이다.