• Journal of the Korea Convergence Society
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• v.9 no.3
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• pp.181-186
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• 2018

Car-sharing services are one of the successful model of sharing economies. The car-sharing service is a kind of car rental service that can pay the cost per minutes, also can makes it easy to book and return by smart phone at any time. Experts predict that the car-sharing services will likely dominate the auto market in the future by reducing the burden on consumers' purchasing cost of car and resolving the environmental issues caused by the vehicle. Therefore, a differentiated service strategy is needed to establish a competitive caching service among these companies. In this study, we surveyed differentiation cases by comparing and analyzing domestic caching companies, And customized service tailored to the situation and effective vehicle type infotainment. As a result of this study, the proposed service method change, customized service provision, and new platform application are expected to be detailed and in depth.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.16 no.4
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• pp.132-152
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• 2017

Network performance measure has been more and more important in transportation sector because traffic congestion has been steadily increasing in urban area. VKT is defined a sum of traveled distances of whole vehicles on the road network and one of the most important measure of effectiveness (MOE) for network performance measure. This paper aims to propose a methodology for estimating VKT and to apply it to calculate VKT in 6 major cities in Korea. We calculate VKT in 6 major cities by estimating traffic volumes on the uncollected road sections using regression kriging. It is expected that the proposed methodology can be applied various cities.

• International Journal of Highway Engineering
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• v.11 no.2
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• pp.175-184
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• 2009

The study analyzes likely impacts of left truck lane restriction strategies on urban freeways based on a traffic simulation model. This study contains two main parts. The first part is performed to develop feasible alternatives as well as provide insights into conditions under left truck lane restrictions would be effective based on the analysis of two representative hypothetical highways. Different levels of O-D demands and truck percentage is at least restrictions would work when maximum rate of flow is more than 1,300vphpl or truck percentage is at least over loft of the total traffic. The second part of our study concerns a case study on a region with perhaps the highest truck volumes in the U.S. - a northbound section of Interstate 710 corridor in Los Angeles County, Southern California. The results show that restricting the two leftmost lanes under congested traffic with heavy ruck use, provides the most positive impacts in terms of improving the flow of traffic and saving fuel. In addition, our study demonstrates that in general, the number of lanes restricted is a crucial factor in the success of this strategy.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.290-293
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• 2013

Due to vehicle personal injury accident does not, and to analyze the cause and prevention of a variety of devices and technologies are coming out. Among other things, representative of the black box, and rear camera. Despite these advances in technology, and vehicle human injuries continue to occur. The reason for this is that the children, the negligence of the driver or the vehicle is in reverse when a person suddenly passed the back of the vehicle, or the rear of the existing detection system is properly detected was unable to. Therefore, In this paper, we want to design a black box to reveal the cause of the accident, using Kinect to prevent accidents, rear-view camera and rear integrated black box system.

• Journal of Korean Society of Transportation
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• v.28 no.3
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• pp.29-37
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• 2010

Ramp metering control is the most representative strategy of uninterrupted flow control and management system. Ramp metering is to adjust vehicles entering an expressway in such a way that expressway mainline maintains flow stability by regulating ramp vehicles. The effect of two metering strategies, single-entry metering and platoon metering, on mainstream under the same metering rate with pre-timed metering are analyzed by micro-simulation. Platoon metering shows lower performance than single-entry metering under the same metering rate in terms of speed, density, and delay, causes earlier breakdown than single-entry metering. It indicates that the selection of metering type has critical importance as the flow of mainline is high.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.11 no.6
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• pp.103-110
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• 2012

In Vehicle Safety Communication (VSC), noted as a representative application of VANET technologies, emergency warning messages (EWM) are broadcast over vehicles in response to an emergency situation. However, as the number of vehicles increases, the so-called Broadcast Storm Problem often occurs due to a huge number of redundant EWM transmitted. Though many approaches in the literature have been proposed to solve the problem, most of them require the preliminary phase for setting up or refreshing neighbor relationship through exchanging beacon messages with nearby vehicles, thereby further increasing the traffic load. In this paper, we propose Longest Leaping Relay (LLR) scheme which can efficiently solve the Broadcast Storm Problem without any preliminary phase for setting up neighbor relationship. Through computer simulations, we compared the performance of the proposed scheme with competitive schemes and verified the proposed scheme outperforms the existing schemes.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.451-454
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• 2006

텔레매틱스 서비스 중 가장 중요한 서비스는 운전자가 요청하는 교통 상황 정보를 신속하고 정확하게 전달해 주는 것이다. 본 논문에서는 GPS 단말기를 장착한 차량들을 통해 수집된 자료를 활용한다. 가까운 과거의 패턴 자료를 이용하여 필터링 범위를 산정한 후, 실시간으로 비정상적인 GPS 자료를 제거하여 링크의 대표 속도 값을 산출하는 방법을 제시한다.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1997.04a
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• pp.247-252
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• 1997

최근 자동차 배기 가스에 대한 규제가 강화되고 있고, 특히 자동차 매연중 대젤 차량에 대한 배기 가스 저감이 관심의 대상이 되고 있다. 이러한 배기 가스 규제에 대응하기 위하여 엔진의 여러 부위에 대한 설계변경이 이루어지고 있다. 설계변경의 대표적인 예로는 피스톤 탑 링(top piston ring)의 위치를 현재보다 위로 하고 피스톤과 라이너 사이의 간극을 좁게하여 크레비스 볼륨을 줄이거나, 연로 분사 시기 지연, 배기가스재순환(EGR, Exhaust Gas Recirculation)장치 등이 있다. 본 보고에서는 모사 실험 결과에 추가하여 엔진 시험을 수행함으로써 엔진유의 분산 특성및 산화안정성에 미치는 기유와 첨가제의 영향을 조사하였다.

• Electronics and Telecommunications Trends
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• v.27 no.1
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• pp.101-112
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• 2012

자동차 레이더 부품 기술의 대표적인 활용 예인 차량안전시스템이란 지능형 교통시스템을 구현하기 위한 필수 기술로 열악한 기상조건 또는 운전자의 부주의로 인해 발생 가능한 사고를 미연에 방지할 목적으로 개발된 차량의 안전 운행 시스템을 의미한다. 특히 77GHz 주파수를 이용한 자동차 레이더 시스템은 차세대 안전 장비 중에서 가장 핵심적인 시스템이며, 미래 자동차 안전 산업 기술에 있어서 필수적이라 하겠다. 본고에서는 77GHz 자동차 레이더 부품 기술의 특징을 알아 보고 개발 현황 및 앞으로의 전망을 예측하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.1005-1008
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• 2011

본 논문에서는 교통 이력자료의 시공간 데이터를 활용하여 교통 분석 및 예측에 필요한 신뢰성 높은 데이터를 제공하기 위한 TCS/HI-PASS 전처리 알고리즘을 제안한다. 시공간 데이터의 전처리 알고리즘은 각종 교통정보에 이용되고 있으며, 그 중 대표적으로 활용되고 있는 것이 차량 검지기(VDS)를 통해 수집된 교통량, 속도, 점유율 정보이다. 이러한 정보에 가공처리 알고리즘을 적용하여 공간평균속도 기반의 통행시간을 산정하고 있으며, 고속도로 통행료 수납시스템(TCS)으로 부터는 출발영업소와 도착영업소의 진 출입시간을 기반으로 평균통행시간을 산정하고 있다. 본 연구에서는 차량 검지기(VDS) 데이터와 기존 TCS 데이터의 전처리 알고리즘을 분석하여 TCS와 HI-PASS 데이터 기반의 개선된 전처리 알고리즘을 설계, 구현하였다.