• 한국ITS학회 논문지
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• 제17권4호
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• pp.112-123
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• 2018

자율협력주행 도로시스템은 자율주행차와 V2X 통신으로 연결되어 상호정보를 주고받으며 자율주행차의 안전주행을 지원하는 도로인프라 시스템을 말합니다. 본 연구는 자율협력주행 도로시스템 서비스의 성능평가 방안 제시를 목적으로 하며, 도로인프라에서 자율주행차에 정보를 제공하는 I2V 서비스 중 '작업구간 정보제공 서비스'를 예를 들어, 먼저 서비스에 대한 Use Case 분석과 서비스 성능을 확인하기 위해 필요한 요구사항 및 서비스 범위를 정의하고, 이러한 서비스의 성능평가 수행을 위한 평가시스템을 제안하였다. 또한, 본 연구에서 제안한 평가시스템을 활용하여 '작업구간 정보제공 서비스'의 현장시험을 통해 평가 가능여부를 검증하였다.

• 한국융합학회논문지
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• 제9권3호
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• pp.181-186
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• 2018

카셰어링(Car Sharing) 서비스는 대표적인 공유경제의 성공 모델 중 하나이다. 카셰어링 서비스는 스마트폰 어플리케이션으로 언제든 쉽게 예약, 반납이 가능하고 분 단위로 요금을 내는 차량 대여 서비스이다. 이것은 소비자들의 차량 구매 비용에 대한 부담을 감소시키고 차량으로 인해 발생하는 환경문제를 해결하는 등의 장점으로 향후 자동차 시장을 좌우할 것으로 전문가들은 전망하고 있다. 국내에서도 대표적인 여러 업체가 이미 주를 이루고 있고, 그 밖에 다른 업체들도 카셰어링 서비스에 진입하고 실정이다. 따라서 이러한 기업들 사이에서 경쟁력 있는 카셰어링 서비스로 자리 잡기 위해서는 보다 차별화된 서비스 전략이 필요하며, 본 연구에서는 국내 카셰어링 업체들을 비교분석하여 차별화 사례를 조사하고, 설문조사 기법을 통하여 고객특성과 상황에 맞춘 고객 맞춤형 서비스와 효과적인 차량형 인포테인먼트 등의 새로운 형태의 차별화 방안 제안하였다. 본 연구 결과로 제안된 서비스 방식의 변화, 고객 맞춤 서비스 제공, 새로운 플랫폼 적용 등이 구체적이며 심도있는 향후 연구를 기대한다.

• 한국IT서비스학회지
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• 제20권2호
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• pp.147-166
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• 2021

As vehicle sharing service is being widely used in China. The sharing economy appeared to be a way to make people's lives more convenient and to utilize limited resources efficiently. Sharing economy companies have created an app to satisfy users' needs with providing more benefits. Although research on vehicle sharing services has been continuously conducted at the level of the sharing economy, there are not many empirical studies related to the perception of the sharing economy from the consumer's point of view. In this sense, this study considered the perceived relationship benefits (social benefits, economic benefits, psychological benefits, and functional benefits) of Didi chuxing service as the key independent variables influencing users' confirmation and satisfaction, And suggests that users' confirmation and satisfaction are the key determinants of Didi continuance intention . To test the proposed research model, this study conducted structural equation model using 268 data collected on the users who have experience of Didi service. According to the empirical analysis results, This study verifies that: First, social benefits, economic benefits, psychological benefits, and functional benefits are determinants of user's satisfaction. Second, expectation confirmation depends on economic benefits, psychological benefits, functional benefits and social influence, meanwhile, social benefit has no effect on expectation confirmation. Third, expectation confirmation is proved to be a positive predictor of users' satisfaction. Finally, this results indicate that continuous use intention is determined by users' satisfaction.

• 대한교통학회지
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• 제34권6호
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• pp.523-534
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• 2016

본 연구는 수도권지역을 운행하는 광역버스를 대상으로 차내혼잡도 완화의 편익측정방법론 개발을 목적으로 하고 있다. 비시장재의 편익측정방법론에 대한 조사, 분석을 통해서 조건부가치측정법을 조사기법으로, Tobit모형을 측정모형으로 선정하였다. 설문조사를 통해서 992개의 유효표본이 얻어졌으며 연령, 소득수준, 버스탑승시간, 통행목적, 혼잡도 등을 설명변수로, 광역버스 차내혼잡도 완화에 대한 추가지불의사액을 종속변수로 하는 Tobit모형을 추정하였다. 통계적 검정과 논리적 검정을 통해서 모형의 적합도가 검정되었으며 모형으로부터 산출된 광역버스 차내혼잡도 완화에 대한 추가지불의사액을 경기도가 인가한 광역버스 이용실태에 적용한 결과, 수도권 지역에서 광역버스 좌석제를 시행할 경우 일평균 약 61백만 원, 연간 약 147억 원의 편익이 발생할 것으로 추정되었다.

• 디지털산업정보학회논문지
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• 제12권2호
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• pp.15-24
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• 2016

GPS(Global Positioning System) location tracking is a method for taking the precise coordinates after the coordinates are obtained by a GPS receiver, and displaying them on the map. In this paper with WAVE(Wireless Access for Vehicular Environment) simulation, we show that various services such as vehicle tracking service, real-time road conditions service and logistics can go tracking service, control and operation services according to the vehicle position and the traveling direction by using the GPS position data. A vehicle tracking system using GPS is automatically able to manage multiple RCP when exchanging data between RMA and the RCP, and it provides rapid requests and responses. To verify that multiple sessions between RMA and RM, as well as multiple sessions between RMA and RCP are able to be implemented, we take RMA as a RCP application on an OBU, until the RMA is receiving data response from corresponding RM. As a result of this experiment, we show that the response speeds of single session between RMA and RM using 1, 2, 3, and 4 kbyte unit data are similar, 62.32ms, 62.65ms, 63.02ms, and 63.48ms, respectively. Likewise, those of 128 muliple sessions using 1, 2, 3, and 4 kbyte unit data are not much more time difference, 298.08ms, 302.21ms, 322.85ms, and 329.62ms, respectively.

• 자동차안전학회지
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• 제15권2호
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• pp.6-12
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• 2023

For the commercialization and standardization of autonomous vehicles, demand for rigorous safety criteria has been increased over the world. In Korea, the number of extraordinary service permission for automated vehicles has risen since Hyundai Motor Company got its initial license in March 2016. Nevertheless, licensing standards and evaluation factors are still insufficient for operating on public roadways. To assure driving safety, it is significant to verify whether or not the vehicle's decision is similar to human driving. This paper validates the safety of the autonomous vehicle by drawing scenario-based comparisons between manual driving and autonomous driving. In consideration of real traffic situations and safety priority, seven scenarios were chosen and classified into basic and advanced scenarios. All scenarios and safety factors are constructed based on existing ADAS requirements and investigated via a computer simulation and actual experiment. The input data was collected by an experimental vehicle test on the SNU FMTC test track located at Siheung. Then the offline simulation was conducted to verify the output was appropriate and comparable to the manual driving data.

• 한국통신학회논문지
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• 제40권1호
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• pp.96-107
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• 2015

네트워크(Vehicular Ad-hoc Networks; VANET) 기술은 텔레매틱스/지능형 교통시스템을 구축하여 실시간 정보를 수집 및 공유하여 교통 체증 완화, 교통사고 예방뿐만 아니라, 차량 안에서 인포테인먼트(Infotainment) 서비스를 제공한다. 요구하는 서비스 증가로, 고정된 프레임 안에서 한정된 자원을 사용하는 기존의 기술은 효율적인 차량통신 서비스에 한계가 있다. 따라서 주변 상황에 따라 유연한 동작의 프로토콜 설계와 정보를 효율적으로 인식, 예측, 분배, 공유를 할 수 있도록 적응적인 설계가 필요하다. 본 논문에서는 차량과 RSU(Road Side Units) 기반의 V2I(Vehicle to Infrastructure) 구조와 차량간 통신 V2V(Vehicle to Vehicle) 구조를 상호 결합하여 차량 통신에 할당된 자원을 보다 효율적으로 관리, 사용하기 위한 새로운 방법을 제안한다. 성능 평가를 통해 제안된 V2I/V2V 협력 스케줄 메시지 전송을 통해 높은 자원 이용률을 달성할 수 있음을 보였고, 제어정보를 넓은 범위로의 신속한 전송을 위한 최적 전송 기회 시간과 2차 릴레이 차량 전송 확률 값을 도출하였다.

• 산업경영시스템학회지
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• 제44권4호
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• pp.145-153
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• 2021

Automated Guided Vehicle (AGV) is commonly used in manufacturing plant, warehouse, distribution center, and terminal. AGV is self-driven vehicle used to transport material between workstations in the shop floor without the help of an operator, and AGV includes a material transfer system located on the top and driving system at the bottom to move the vehicle as desired. For navigation, AGV mostly uses lane paths, signal paths or signal beacons. Various predominant sensors are also used in the AGV. However, in the conventional AGV, there is a problem of not turning or damaging nearby objects or AGV in a narrow space. In this paper, a new driving system is proposed to move the vehicle in a narrow space. In the proposed driving system, two sets of the combined steering-drive unit are adopted to solve the above problem. A prototype of AGV with the new driving system is developed for the comparative analysis with the conventional AGV. In addition, the experimental result shows the improved performance of the new driving system in the maximum speed, braking distance and positioning precision tests.

• 디지털산업정보학회논문지
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• 제10권2호
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• pp.61-73
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• 2014

An automatic vehicle location tracing system is to build GIS server and on transmission for providing service in various ways by collecting a GPS location information from each vehicle. It is to save GPS data from OBU built-in on the vehicle and transmit the GPS data using the RSU on the roadside and WAVE communication technology. The collected data from the RSU is transmitted to the GIS server and stored in DB(database) and based on the GPS data that was collected from the each vehicle the system is to provide user service to suit the applications so it is to provide various services between RSU and OBU. In this paper, by implementing a multi-session process between the RM and the RMA a variety of services between RSU and OBU are provided. In addition, the system is designed and implemented using GPS to provide a variety of services, for the services provided from each RMA by configuring them as an independent session so it enables a variety of services implemented from one of RSU. With the result of the comparative analysis on the multi-session processing and single-session processing it shows that the differenes of them are minor in repect of the data loss rate and the data transfer rate but various services can be provided.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.1575-1580
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• 2009

Maglev vehicle has two kinds of suspension system such as a secondary suspension with air-spring and a primary suspension as electromagnetic suspension which composed of electromagnet, magnet driver, controller and sensors. The interaction between each dynamic component of vehicle and track effects the stability and running performance. To achieve the specified performance of vehicle, many various approaches of research were tried, then as the result of these efforts, the first commercial operating with Maglev will start soon. The bogie for revenue service from 2012 has some significant modifications compared to the previous one, and to verify the changes the half prototype vehicle was manufactured and took the running performance test. In this report, we will introduce the stage of manufacturing and report results of dynamic performance tests to verify new concept of bogie mechanism.