• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.969-971
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• 2021

본 논문은 통학버스 예약 시스템으로 안드로이드 모바일 애플리케이션을 통하여 직관성 있는 UI와 빠른 피드백을 제공하는 실시간 서비스를 이용하여 통학버스를 이용하는 학생에게 간편하고 빠른 자리 예약 서비스를 제공한다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.22 no.6
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• pp.196-207
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• 2023

As part of measures to address the climate crisis, buses are also being converted to electric and hydrogen buses. Local authorities need to prioritize carbon emissions when allocating newly introduced and converted electric and hydrogen buses, and as a method, consider the introduction of Low Emission Bus Zones (LEBZ) to propose the reduction of pollution from specific links. To introduce LEBZ, it is necessary to compare the carbon emissions before and after its implementation, yet there is a shortage of studies that focus solely on buses or analyze the effects of introducing LEBZ to specific links. In this paper, we utilized bus information system data to calculate and compare the effects of introducing LEBZ to bus priority lanes in Jeju. We categorized scenarios into five groups, with scenarios 1 through 4 involving the introduction of LEBZ, and scenario 5 designating cases where LEBZ was not introduced. Comparative results confirmed that in scenarios with LEBZ introduction, the reduction per km reached a maximum of 0.097t per km, whereas in cases without LEBZ, it amounted to 0.022t per km, demonstrating higher efficiency. It underscores the significance of conducting carbon emission calculations and comparing the effects of LEBZ introduction using bus information system data, which can be directly applied by local authorities to make informed and rational decisions.

• Journal of Korean Society of Transportation
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• v.35 no.4
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• pp.348-359
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• 2017

Recently, various public transportation activation policies are being implemented in order to mitigate traffic congestion in metropolitan areas. Especially in the metropolitan area, the bus information system has been introduced to provide information on the current location of the bus and the estimated arrival time. However, it is difficult to predict the travel time due to repetitive traffic congestion in buses passing through complex urban areas due to repetitive traffic congestion and bus bunching. The previous bus travel time study has difficulties in providing information on route travel time of bus users and information on long-term travel time due to short-term travel time prediction based on the data-driven method. In this study, the path based long-term bus travel time prediction methodology is studied. For this purpose, the training data is composed of 2015 bus travel information and the 2016 data are composed of verification data. We analyze bus travel information and factors affecting bus travel time were classified into departure time, day of week, and weather factors. These factors were used into clusters with similar patterns using self organizing map. Based on the derived clusters, the reference table for bus travel time by day and departure time for sunny and rainy days were constructed. The accuracy of bus travel time derived from this study was verified using the verification data. It is expected that the prediction algorithm of this paper could overcome the limitation of the existing intuitive and empirical approach, and it is possible to improve bus user satisfaction and to establish flexible public transportation policy by improving prediction accuracy.

• Journal of KIISE:Computer Systems and Theory
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• v.30 no.7_8
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• pp.370-380
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• 2003

A large RAID system may consist of several PCI bus segments since a PCI bus segment can connect only a limited number of disks. In this paver, PCI bus transactions in a RAID system are classified in terms of the initiator and the target of the transaction. Also, the data transfer time of each transaction type is analyzed. By using the analysis results, read and write performance of two RAID system configurations are formulated. From simulation of the RAID system using the DEVS formalism, performance of the configurations are evaluated and compared with the analytical results while changing various system parameters.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.22 no.3
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• pp.131-146
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• 2023

Smart card data is widely used in the public transportation field. Despite the inevitability of various errors occur during the data collection and storage; however, smart card data errors have not been extensively studied. This paper investigates inherent errors in boarding and alighting station information in smart card data. A comparison smart card data and bus boarding and alighting survey data for the same time frame shows that boarding station names differ by 6.2% between the two data sets. This indicates that the error rate of smart card data is 6.2% in terms of boarding station information, given that bus boarding and alighting survey data can be considered as ground truth. This paper propose 6-step algorithm for correcting errors in smart card boarding station information, linking them to corresponding information in Bus Information System(BIS) Data. Comparing BIS data and bus boarding and alighting survey data for the same time frame reveals that boarding station names correspond by 98.3% between the two data sets, indicating that BIS data can be used as reliable reference for ground truth. To evaluate its performance, applying the 6-step algorithm proposed in this paper to smart card data set shows that the error rate of boarding station information is reduced from 6.2% to 1.0%, resulting in a 5.2%p improvement in the accuracy of smart card data. It is expected that the proposed algorithm will enhance the process of adjusting bus routes and making decisions related to public transportation infrastructure investments.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.11 no.2
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• pp.21-28
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• 2012

The continuous deployment of Urban Traffic Information System (UTIS) in Korea has increased the need for developing more practical applications utilizing the standard functions of UTIS facilities installed on urban arterials beyond its basic applications like gathering traffic data and providing traffic information. The UTIS-based bus signal priority may be one of UTIS-based applications meeting such demands. However, the studies on BSP have not been sufficient for actual field deployment in terms of theories and algorithms so that there have been few actual installations on real urban arterials. Thus, this study was aimed at developing a UTIS-based bus priority signal system and evaluating its effectiveness through a field study. To this end, this study presents the system development processes by dividing the UTIS-based bus priority signal system into hardware and software. In addition, the positive effectiveness of the UTIS-based bus priority signal system was verified through a field application test which was conducted at Gyeonggi Global Trade High School intersection.

• 한국ITS학회:학술대회논문집
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• 2004.11a
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• pp.300-305
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• 2004

• Convergence Security Journal
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• v.22 no.3
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• pp.19-24
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• 2022

Metaverse is a compound word of the English words 'meta', meaning 'virtual' and 'transcendence', and 'universe' meaning the universe. dimensional virtual world. Metaverse is a concept that has evolved one step further than virtual reality (VR, a cutting-edge technology that enables people to experience life-like experiences in a virtual world created by a computer). It has the characteristic of being able to engage in social and cultural activities similar to reality. However, there are many security issues related to this, and cybersecurity vulnerabilities may occur. This paper analyzes cybersecurity threats that may occur in the metaverse environment and checks vulnerabilities.

• 한국ITS학회:학술대회논문집
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• 2003.11a
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• pp.340-344
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• 2003

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.229-231
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• 2023

최근 대화형 AI와 생성형 AI의 폭발적인 성장과 현실화로 인해, 한 때 온세상을 떠들썩 하게 했던 메타버스와 블록체인 기술은 잊혀지고 있다. 하지만 메타버스는 필연적으로 Web 3.0 시대의 대표적인 플랫폼으로 흘러갈 것이며, 블록체인 기술은 디지털 경제 생태계의 핵심 기술임에 틀림이 없을 것이다. 언제가 될지는 모르지만 다시금 메타버스가 세상을 혁명적으로 변화 시키는 그 때를 염두에 두며, 메타버스 시스템에서 사용되는 블록체인 기술의 현황을 살펴보고 그리 멀지 않은 미래에서의 모습도 전망해 본다.