• 드라이브 ㆍ 컨트롤
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• 제15권3호
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• pp.58-62
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• 2018

• 한국자동차공학회논문집
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• 제5권6호
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• pp.155-166
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• 1997

In this study, a simulation tool is developed in order to investigate non steady-state cornering performance of 6WD/6WS special-purpose vehicles. 6WD vehicles are believed to have good performance on off-the-road maneuvering and to have fail-safe capabilities. But the cornering performances of 6WS vehicles are not well understood in the related literature. In this paper, 6WD/6WS vehicles are modeled as a 18 DOF system which includes non-linear vehicle dynamics, tire models, and kinematic effects. Then the vehicle model is constructed into a simulation tool using the MATLAB /SIMULINK so that input/output and vehicle parameters can be changed easily with the modulated approach. Cornering performance of the 6WS vehicle is analyzed for brake steering and pivoting, respectively. Simulation results show that cornering performance depends on the middle-wheel steering as well as front/rear wheel steering. In addition, a new 6WS control law is proposed in order to minimize the sideslip angle. Lane change simulation results demonstrate the advantage of 6WS vehicles with the proposed control law.

• 한국도로학회논문집
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• 제14권1호
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• pp.25-34
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• 2012

급속한 경제성장은 대규모 도로건설 및 물류에 필요한 차량의 대형화 및 고속화를 유도하였으나, 이로 인해 발생하는 대기오염 및 자동차의 소음, 진동은 사회적 문제로 대두되고 있는 실정이다. 기층용 콘크리트 블록은 Helmholtz Resonators 이론을 접목시킴으로써 차량의 타이어 파열음과 차량음 등을 흡수하여 소음을 현저히 줄이는 기능을 보유하고 있어 접속도로, 아파트 단지내 도로, 주택가 도로 등 소음발생이 높은 지역에 적용한다면 소음저감에 대한 사회적 요구를 충족시킬 수 있다. 본 연구에서는 2-layer 아스팔트포장과 기층용 콘크리트 블록의 복합식 공법으로 일반 콘크리트 블록과 기층용 콘크리트 블록의 흡음효과 시험을 실내 시험으로 실시하였다. 시험 조건으로는 홀 사이즈, 간격, 깊이가 결정된 시편에 각 차종별 초기소음을 다르게 주어 소음저감효과를 분석 하였다. 2-layer아스팔트 표층과 콘크리트블록을 이용하여 차량소음크기, 시편크기, 측정거리, 홀의 형상 및 크기에 따른 데이터를 분석한 결과 소음저감효과는 탁월했으며 약 4dB에서 최대 9dB 정도 감소시킨 것으로 나타났다.

• 대한교통학회지
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• 제22권2호
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• pp.103-108
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• 2004

본 연구는 신호교차로의 정지선 통과차량의 차두시간 결정은 단순히 출발순서에 영향을 받아 결정되지만은 않는다는 문제의식에서 출발하였다. 실제 신호교차로의 개별차량 통과시 속도와 차두시간 자료를 검지기와 검지알고리즘을 활용 파악하고 분석에 활용하였다. 단순 자료분석에서는 차량의 통행행태를 결정하는 모형을 정립하는 것이 무의미한 것으로 파악될 수 있는 통계분석 결과가 나타났다. 그러나, 공격적인 운전행태를 가진 운전자가 운전하는 차량의 자료를 선별하고 자료 스케일 조정(ln값 활용)을 통해 결정계수 0.91수준의 모형이 설정되었다. 구축된 모형은 교차로 정지선에서 통과하는 차량의 차두시간은 앞차의 속도, 차두시간과 자체차량의 속도에 영향을 받는 사실을 밝혀주었다.

• 한국가스학회지
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• 제21권6호
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• pp.70-80
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• 2017

매년 OECD가 발표하는 대기환경 오염분야에서 우리나라가 최하위를 차지했다. 이에 따른 대책으로 수송분야에 관심이 집중되었고, 오염도 측정 결과 대형경유 및 노후차량에서 미세먼지 배출가스가 높게 발생하는 원인으로 정부는 발표하였다. 이를 해결하기 위해 정부가 관련부처 합동으로 "미세먼지 관리 특별대책과 종합대책"을 추진하였다. 환경오염 개선방안으로 시내버스와 전세버스를 대상으로 친환경자동차 전환을 위한 유가 보조금제도를 시행했다. 본 연구에서는 경유버스 대비 천연가스(CNG) 연료전환 시 경제성 평가와 오염물질 배출에 따른 환경비용을 비교분석하였다. 유형별 연료전환 시나리오를 통한 천연가스 차량으로 연료전환을 했을 때 사회적 편익과 환경적 비용을 고려한 정부지원금 정책의 타당성 및 지원금 확대 근거를 제시하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.14-21
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• 2011

Reliability means that a product maintains its initial quality and performance at certain period of time(time, distance, cycle etc) under given condition without failure. Given conditions include both environmental condition and operating condition. Environmental condition means common natural environment such as temperature, humidity, vibration, and working condition means artificial environment such as voltage, current load, install place, hours of use, which occurs during using the product. In the field of railway vehicles, although components of railway vehicles with reliability are the trend of mandatory as persisting period of railway vehicles is extended, using components of railway vehicles is insufficient for the practical reliability assessment. but the meaning of the first railway operating agnecy to acquire the parts in the field, the data suggest the reliability of products if you can and can show the reliability of modular units and modular units can provide the reliability of if you can present reliability of the entire system is thought to be here. In this study, lifespan of micro-switch for master controller is analyzed and prediction is performed based on its field data considering the special circumstances of railway vehicles operating agency, such as a large number of trains operates on the same line.

• 시스템엔지니어링학술지
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• 제7권1호
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• pp.57-69
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• 2011

Reliability means that a product maintains its initial quality and performance at certain period of time(time, distance, cycle etc) under given condition without failure. Given conditions include both environmental condition and operating condition. Environmental condition means common natural environment such as temperature, humidity, vibration, and working condition means artificial environment such as voltage, current load, install place, hours of use, which occurs during using the product. In the field of railway vehicles, although components of railway vehicles with reliability are the trend of mandatory as persisting period of railway vehicles is extended, using components of railway vehicles is insufficient for the practical reliability assessment. but the meaning of the first railway operating agency to acquire the parts in the field, the data suggest the reliability of products if you can and can show the reliability of modular units and modular units can provide the reliability of if you can present reliability of the entire system is thought to be here In this study, lifespan of micro-switch for master controller is analyzed and prediction is performed based on its field data considering the special circumstances of railway vehicles operating agency, such as a large number of trains operates on the same line.

• Industrial Engineering and Management Systems
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• 제15권4호
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• pp.290-297
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• 2016

The successful transfer of technology, needs to recognize the industrial purposes, resources, technology, innovation and the mode of transmission, methods of transmission, influential factors, it's how to recruit and how to develop, and each of these cognitive relies on special expertise. One of the important technologies is automotive technology, and s technology is important for the transition and its development in recent years. Hence, in this paper, after studying Iran and the world's automotive and emerging technologies situation, the status of commercial vehicles and s technology model are studied based on external models, technical specifications, and cost. In this way, we examine the incidence and the applicability of the technology used in the production of heavy-duty vehicles, in recent years, with the passage of time, and we examine the technology lifecycle, from the perspective of physical characteristics and technical features. The results show that the technology of the studied heavy-duty vehicles (Titan) is close to the time of his fall, because spending puberty, so, according to the investigation of new technologies, we should strive to create changes in vehicle technology.

• Asian Pacific Journal of Cancer Prevention
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• 제16권18호
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• pp.8019-8029
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• 2016

The development of new strategies for vaccine delivery for generating protective and long-lasting immune responses has become an expanding field of research. In the last years, it has been recognized that bacteriophages have several potential applications in the biotechnology and medical fields because of their intrinsic advantages, such as ease of manipulation and large-scale production. Over the past two decades, bacteriophages have gained special attention as vehicles for protein/peptide or DNA vaccine delivery. In fact, whole phage particles are used as vaccine delivery vehicles to achieve the aim of enhanced immunization. In this strategy, the carried vaccine is protected from environmental damage by phage particles. In this review, phage-based vaccine categories and their development are presented in detail, with discussion of the potential of phage-based vaccines for protection against microbial diseases and cancer treatment. Also reviewed are some recent advances in the field of phagebased vaccines.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권5호
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• pp.1752-1767
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• 2015

As a special type of mobile ad-hoc network, Vehicular Ad-hoc Network (VANET) is considered as an attractive topic by many researchers. In VANETs, vehicles act as routers and clients, which are connected with each other through unreliable wireless links. Due to the dynamic nature of vehicles, developing communication protocols for VANETs is a challenging task. In this paper, we tackle the problem of real-world VANET operations and propose a new dual-level communication scheme through the combination of power and rate control algorithms. Based on the game theoretic approach, the proposed scheme effectively formulates the interactive situation among several vehicles. With a simulation study, it is confirmed that the proposed scheme can achieve better performance than other existing schemes under widely diverse VANET environments.