• 한국산학기술학회논문지
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• 제11권10호
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• pp.4005-4011
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• 2010

본 연구는 도로 다이어트 (차로폭 축소) 기법을 적용해 자전거전용도로를 확보한 부산시 남구 자전거도로 시범사업을 중심으로 자전거도로 설치가 자동차흐름에 미치는 영향을 분석하였다. 분석결과 비첨두시간 동안 자동차의 평균지체시간 및 평균정지횟수는 자전거전용도로 설치 후 다소 증가하였으나 통계적으로 유의한 차이를 나타내지 않은 반면, 첨두시간 동안 자동차의 평균지체시간 및 평균정지횟수는 자전거전용도로 설치 후 유의한 증가를 나타냈다(alpha=0.1). 첨두시간 분석결과는 교통량이 많을 경우 도로 다이어트가 차로혼잡의 가능성을 높일 수 있다는 기존 국외 연구 결과와 일치하며, 비첨두시간 분석결과는 여유용량으로 인해 자동차의 흐름이 도로 다이어트에 의해 큰 영향을 받지 않는 사실을 반영한 결과로 판단된다.

• International Journal of Automotive Technology
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• 제3권4호
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• pp.129-135
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• 2002

Durability estimation of a prototype vehicle has traditionally relied heavily on accelerated durability tests using predefined proving grounds or rig tests using a road simulator. By use of those tests, it is very difficult to predict durability failures in actual service environments. This motivated the development of an integrated CAE (Computer Aided Engineering) methodology for the durability estimation of a prototype vehicle in actual service environments. Since expensive computational costs such as computation time and hardware resources are required for a full vehicle simulation in those environments with a very long span of event time, the conventional CAE methodologies have little feasibility. An efficient computational methodology for durability estimations is applied with theoretical developments. The effectiveness of the proposed methodology is shown by the comparison of results of the typical actual service environment such as the city mode with those of the typical accelerated durability test over the Belgian road.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.935-938
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• 2004

This paper describes the quantitative analysis on the improvement of equilibrium sensory using virtual bicycle system. We have used a virtual bicycle system that combines virtual reality technology with a bicycle. In this experiment, 10 subjects were tested to investigate the influencing factors on equilibrium sensory. Straight road and curved road driving at several factors including cycling time, number of times of path deviation, and center of pressure(COP) were extracted and evaluated to quantify the extent of control. Also, To improve the effect of balance training, we investigated the usefulness of virtual feedback information by weight shift. The result showed that the system could be effective for equilibrium sensory rehabilitation training device. The analysis method might also have wider applicability to the rehabilitation field.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2010년도 한국컴퓨터종합학술대회논문집 Vol.37 No.1(D)
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• pp.190-195
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• 2010

Vehicular ad hoc networks (VANETs) have a number of interesting applications to preserve road safety, notify users about changed road/traffic condition, handling post accident hazards and moreover service oriented applications to make the travel convenient to the drivers. Use of common information format for diverse applications enables the application developers to easily design flexible information dissemination system for new applications or add new features to existing application. This paper introduces a common information format for various applications in VANETs. The main goal of the paper is to design generalized distributed architectures for vehicular networks, which considers diverse application development scenarios and uses common information format. The proposed architectures enable the application developers to flexibly disseminate information to affected or interested user. In this paper, we have given a detail description of each component of the architectures and how they communicate with each other. In future, we will implement the proposed architecture using suitable simulator.

• 한국생산제조학회지
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• 제21권3호
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• pp.368-375
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• 2012

Durability performance evaluation of automotive components is very important and time consuming task. In this paper, to reduce vehicle component development time and cost virtual testing simulation technology is used to evaluate durability performance of a passenger car front aluminum sub-frame. Multibody dynamics based vehicle model and virtual test simulation model of a half car road simulator are validated by comparisons between rig test results and simulation results. Durability life prediction of the sub-frame is carried out using the model with road load data of proving ground which can evaluate accelerated durability life. We found that the durability performance of the sub-frame is sufficient and it can be predicted within short time compared to rig test time.

• 한국전자통신학회논문지
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• 제9권3호
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• pp.329-334
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• 2014

최근에 전기자동차의 상용화가 머지않은 상황에서 운전자를 위한 다양한 전자적 기능들이 개발되어지고 있다. 특히, 뇌파(EEG)를 통하여 운전자의 상태를 모니터링하면서 졸음방지나 건강상태를 실시간으로 점검하는 기능들이 있다. 자동차 운전자의 뇌파를 의료기관 서버에 전송하여 관련 기능들을 제공할 수 있는데 이때 자동차간 또는 자동차와 노변장치간의 원활한 통신기능이 필수적이다. 따라서 본 논문에서는 도심의 교차로환경에서 원활한 EEG 통신기능을 제공하는 라우팅 프로토콜을 제시하기 위해 AODV, DSR, GRP, OLSR, TORA와 같은 5가지의 라우팅 프로토콜로 운영되는 무선통신망을 각각 설계하고 이를 OPnet 네트워크 시뮬레이션을 통하여 성능을 평가하고 결과를 제시하고자 한다.

• 대한원격탐사학회지
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• 제38권1호
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• pp.1-20
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• 2022

As unmanned aerial vehicle (UAV) technology grew in popularity over the years, it was introduced for air quality monitoring. This can easily be used to estimate the sidewalk emission concentration by calculating road traffic emission factors of different vehicle types. These calculations require a simulation of the spread of pollutants from one or more sources given for estimation. For this purpose, a Gaussian plume dispersion model was developed based on the US EPA Motor Vehicle Emissions Simulator (MOVES), which provides an accurate estimate of fuel consumption and pollutant emissions from vehicles under a wide range of user-defined conditions. This paper describes a methodology for estimating emission concentration on the sidewalk emitted by different types of vehicles. This line source considers vehicle parameters, wind speed and direction, and pollutant concentration using a UAV equipped with a monocular camera. All were sampled over an hourly interval. In this article, the YOLOv5 deep learning model is developed, vehicle tracking is used through Deep SORT (Simple Online and Realtime Tracking), vehicle localization using a homography transformation matrix to locate each vehicle and calculate the parameters of speed and acceleration, and ultimately a Gaussian plume dispersion model was developed to estimate the CO, NOx concentrations at a sidewalk point. The results demonstrate that these estimated pollutants values are good to give a fast and reasonable indication for any near road receptor point using a cheap UAV without installing air monitoring stations along the road.

• 대한인간공학회지
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• 제35권1호
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• pp.11-27
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• 2016

Objective: The purpose of this study was to develop and evaluate high technology adaptive driving controls, such as mini steering wheel-lever system and joystick system, for the people with physical disabilities in the driving simulator. Background: The drivers with severe physical disabilities have problems in operation of the motor vehicle because of reduced muscle strength and limited range of motion. Therefore, if the remote control system with driver-by-wire technology is used for adaptive driving controls for people with physical limitations, the disabled people can improve their quality of life by driving a motor vehicle. Method: We developed the remotely controlled driving simulator with drive-by-wire technology, e.g., mini steering wheel-lever system and joystick system, in order to evaluate driving performance in a safe environment for people with severe physical disabilities. STISim Drive 3 software was used for driving test and the customized Labview program was used in order to control the servomotors and the adaptive driving devices. Thirty subjects participated in the study to evaluate driving performance associated with three different driving controls: conventional driving control, mini steering wheel-lever controls and joystick controls. We analyzed the driving performance in three different courses: straight lane course for acceleration and braking performance, a curved course for steering performance, and intersections for coupled performance. Results: The mini steering wheel-lever system and joystick system developed in this study showed no significant statistical difference (p>0.05) compared to the conventional driving system in the acceleration performance (specified speed travel time, average speed when passing on the right), steering performance (lane departure at the slow curved road, high-speed curved road and the intersection), and braking performance (brake reaction time). However, conventional driving system showed significant statistical difference (p<0.05) compared to the mini steering wheel-lever system or joystick system in the heading angle of the vehicle at the completion point of intersection and the passing speed of the vehicle at left turning. Characteristics of the subjects were found to give a significant effect (p<0.05) on the driving performance, except for the braking reaction time (p>0.05). The subjects with physical disabilities showed a tendency of relatively slow acceleration (p<0.05) at the straight lane course and intersection. The steering performance and braking performance were confirmed that there was no statistically significant difference (p>0.05) according to the characteristics of the subjects. Conclusion: The driving performance with mini steering wheel-lever system and joystick control system showed no significant statistical difference compared to conventional system in the driving simulator. Application: This study can be used to design primary controls with driver-by-wire technology for adaptive vehicle and to improve their community mobility for people with severe physical disabilities.

• 대한교통학회지
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• 제29권5호
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• pp.67-78
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• 2011

본 연구에서는 30명의 피실험자를 대상으로 운전자의 운전부하 특성을 분석하였다. 설계운전자의 심리생리적 특성을 파악하고자 뇌의 후두엽부위 뇌파신호를 이용하여 시뮬레이션 실험과 현장주행 실험을 수행하였다. 본 연구를 통해 다음과 같은 결론을 도출하였다. 첫째, 운전자의 생체신호(뇌파)를 이용하여 설계운전자의 특성을 표현할 수 있었다. 둘째, 설계운전자의 운전부하 설명변수로는 베타파 값과 상대에너지 계수 값이 통계적으로 유의하였다. 셋째, 시뮬레이터 주행실험치의 90퍼센타 일 범위값이 설계운전자의 특성으로 적정한 것으로 분석되었다. 넷째, 실제 도로주행상황에서, 설계운전자의 최대 각성값은 베타파의 경우 31.72이며, 상대에너지계수 지표의 경우 1.296으로 분석되었다.

• 한국도로학회논문집
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• 제12권3호
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• pp.9-16
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• 2010

본 연구는 시뮬레이터를 이용하여 속도감속 노면표시 유형별로 감속 효과가 어느 정도인지에 대한 연구를 수행하였다. 이를 위해서 20~70대의 다양한 연령층으로 구성한 41명이 실험에 참여하였다. 구간별 기법에 따른 속도현황을 살펴보면, 노면표시 시작지점 및 곡선시작점에서 Peripheral Transverse Line II의 속도 감속효과가 가장 좋은 것으로 나타났다. 본 연구는 도로이용자의 인간공학적 고려 요소를 바탕으로 운전자 시각특성을 고려한 감속유도기법 개발에 있어서 그 효과를 검증했다는 점에서 의의가 있다. 향후 연구로는 감속유도 노면표시가 장기적으로 운전자에게 효과적인지에 대한 검증이 필요하며, 색의 대비(예 : 흰색 노면표시에 검은색 아스팔트)에 따른 속도감속 효과가 있는지에 대한 연구도 필요하다.