• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.4 no.3 s.8
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• pp.51-59
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• 2005

To improve the quality of bus service, providing bus ravel time information to passenger through station screen. Generally, bus travel time information predict by using previous bus data such as neural network, Kalman filtering, and moving average algorithms. However, when they got a difficulty about bus travel time information because of the missing previous bus data, they use pattern data. Generally, nevertheless the difference of range is big. Hence in this research to calculate the bus travel time information when the bus information is missed, use queue detector's data which set up in link. The application of several factors which influence in bus link travel time, we used CORSIM Version 5.1 simulation package.

• Journal of IKEEE
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• v.22 no.2
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• pp.250-257
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• 2018

In this paper, a smart bus system that automates public bus traffic payment by applying beacon and computer vision and provides bus route information, real-time location information, getting off alarm is proposed. By using the beacon to recognize busses near the stop and to board the bus to be boarded, this system automatically processes the payment when boarding by using the distance from the beacon and the information provided by the beacon and the face comparison. After the payment processing, the system provides the route information of the boarded bus and the real-time bus location information to the user, and when the user sets an alarm using these informations, the alarm is activated when the bus leaves the bus stop.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.780-783
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• 2012

Recently, the SoC industry mainly uses various multi-layered bus architectures. However, reckless use of bus layers may results in on-chip communication resources and waste of silicon area. This paper performs a quantitative analysis to compare the two de-facto on-chip buses and SNP. Through the performance estimation, the performance of SNP turns out to be significantly enhanced for asymmetric write and read traffic (non-central F distribution) while symmetric traffic is similar to that of AXI. More specifically, SNP properly places IP cores on the top or bottom, induces the write and read channels to be balanced, and achieves about twenty percent improved performance compared to AXI.

• Annual Conference of KIPS
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• 2018.10a
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• pp.943-946
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• 2018

본 논문은 공공데이터 API를 활용한 ITS(Intelligent Transport System)를 구현하여, 버스 승하차 관련 문제를 개선하는 버스 승하차 사전 알림 시스템에 관한 것이다. 수도권 및 대도시 전체 버스 관련 민원신고 중 가장 많이 차지하는 부분이 버스의 정류장 무정차 통과 및 승차거부 문제다. 이를 해결하기 위해 사전에 승객의 승하차 여부를 버스 운전사에게 미리 알리는 시스템을 제안한다. 이 시스템은 승객용 애플리케이션, 중앙 서버 그리고 버스에 설치되는 디바이스로 구성되어 있으며 예비 승하차 승객이 애플리케이션을 이용하여 자신이 원하는 버스에 대한 정보를 MQTT Broker를 이용하여 서버에 보내고 서버는 해당 버스의 정보와 현재 노선의 운행 현황을 주기적으로 확인하여 요청 정류장 이전에 도달하였을 때 버스 운전자 측 디바이스에 신호를 보내어 버스 운전자가 예비 승하차 승객이 있음을 사전에 알 수 있게 한다. 이 시스템을 통해 무정차 및 승차거부 문제를 근본적으로 해결하여 사용자 편의 승객 안전 일반 차량 운전자 안전 도로 교통 안정화를 도모한다.

• Journal of the Korean Society for information Management
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• v.39 no.4
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• pp.307-345
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• 2022

Due to the prolonged COVID-19 pandemic, metaverse has begun to receive attention as a means of providing future services. The importance of metaverse was further emphasized and metaverse platforms are being used by various institutions. Against this background, cases of using the metaverse platform in libraries are increasing. Therefore, the purpose of this study is to investigate domestic and foreign library cases using the metaverse platform and analyze each platform's characteristics and content types according to the metaverse platform's method. Based on the findings, the implication of the current study suggests the future direction of using the metaverse platform in the library.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.13 no.1
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• pp.15-25
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• 2014

Bus signal priority is a name for various techniques to speed up bus public transport services at intersections with traffic signals. In this study propose methodology to optimize signal times for Early green, Green extension out of the active bus signal priority using deterministic delay model in isolated intersection on median bus lane. Fluctuation is found in the vehicle delay and person delay in the event that using this methodology redistributed to green time and checking slack green time is correct value by sensitivity analysis. As a result of the study, car delay is increased a little and person delay is decreased. As a result of slack green time sensitivity, delay is not much in it if variation of slack green time under 30%. But this methodology effectiveness is under claimed capacity if variation of slack green time over 30%.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.45 no.9
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• pp.96-102
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• 2008

The SoC bus topology is classified to single and multiple bus systems due to bus number. In single bus system, the selected only one master among the masters that try to initiate the bus transaction can execute its data transaction. On the other hand, in multiple bus system, as several buses that can be operated independently are connected with bridge, multiple data can be transferred parallel in each bus. However, In the case of data communication from one bus system to the other, data latency has remarkably increased in multiple bus. Furthermore, the performance of multiple bus can be easily different from master number, slave type and so on. In this paper, the performance of single and multiple bus architecture is compared and quantitatively analysed with the variation of master number and slave type especially a tying SDRAM, SRAM and register with TLM simulation method.

• Journal of the Korea Society of Computer and Information
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• v.19 no.12
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• pp.247-255
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• 2014

This study supplements the existing bus information system's weakness which is a text-based system, transmits GUI based user request contents, design and implements the bus information system using smart-phone GPS. The existing bus information system had to install the terminals on the bus and take enormous expenses on maintenance with setting up the direction board on each bus station. The proposed system provides bus route and user location using the smart-phone map screen, finds the nearest bus station, indicates the bus route on map screen, applies our algorithm which increases accuracy of the bus arriving time, and provides route construction of the inner-cycle bus. The accuracy of the estimated bus arriving time has increased to about 88.71% which is 22.71% more than the existing system whose accuracy is 67% and improved into GUI form that the existing system was on text and table UI. Consequently, the upgraded bus information system uses the smart-phone GPS to supplement the existing bus information system and satisfies different requests of users.

• Journal of Korean Society of Transportation
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• v.29 no.5
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• pp.43-54
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• 2011

After implementing "Semi-public management system of intra-city bus", the burden of financial aid for unprofitable routes is on the increase in Busan metro city. It becomes a heavy burden on the local finance, which needs to be resolved for improving the intra-bus system. The rainfall is one of the factors influencing the demands for intra-bus in urban transportation. Motivated by this fact, this study investigates the impact of rainfall on the intra-city bus demand. Actual bus users are surveyed on their patterns and recognition of using the bus according to the amount of rainfall. A rainfall forecast model using ordered probit model is presented, and the elasticity of the intra-city bus utilization to the amount of rainfall is also analyzed. The resulting findings could be applied to promote the use of intra-city buses and also be utilized as basic data for other studies to improve the intra-city bus system.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.45 no.5
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• pp.1-7
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• 2008

The general bus architecture consists of masters, slaves, arbiter, decoder and so on in shared bus. Specially, as several masters do not concurrently receive the right of bus usage, the arbiter plays an important role in arbitrating between shared bus and masters. Fixed priority, round-robin, TDMA and Lottery methods are developed in general arbitration policies, which lead the efficiency of bus usage in shared bus. On the other hand, the bus architecture can be modified to maximize the system performance. In the paper, we propose the flying master bus architecture that supports the parallel bus communication and analyze its merits and demerits following various arbitration policies that are mentioned above, compared with normal shared bus. From the results of performance verification using TLM(Transaction Level Model), we find that more than 40% of the data communication performance improves, regardless of arbitration policies. As the flying master bus architecture advances its studies and applies various SoCs, it becomes the leading candidate of the high performance bus architecture.