• 한국ITS학회 논문지
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• 제21권1호
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• pp.17-34
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• 2022

본 논문은 수요대응형 모빌리티 이용객의 출발지와 목적지까지 최적 경로 산정을 위한 동적정류장 배정 모형을 개발하였다. 여기서 최적화를 위한 변수로는, 운영자 측면에서 버스통행시간과 이용자 측면에서 서비스 이용 시 추가로 소요되는 정류장까지 도보시간 및 대기시간, 우회시간을 사용하였다. 미국 캘리포니아주 애너하임과 주변 도시를 포함하는 네트워크를 대상으로 승객이 예약한 시종점에서 접근 가능한 동적정류장 리스트를 산정하고 K-means 클러스터링 기법을 이용하여 시종점 그룹들을 각기 차량에 배정하였다. 버스통행시간과 이용자 추가소요시간을 최소화하는 동적정류장 위치 및 버스노선 결정을 위한 모형을 개발하고 다목적 최적화를 위해 NSGA-III 알고리즘을 적용하였다. 최종적으로, 모델의 효용성을 평가하기 위해 이용자 추가소요시간 간의 변수를 조정하여 7개의 시나리오를 설정하였고 이를 통해 목적함수의 타당성을 분석하였다. 그 결과, 운영자 측면에서는 버스통행시간과 승객 대기시간만 고려한 시나리오가, 이용자 측면에서는 버스통행시간, 도보시간, 우회시간을 적용한 시나리오가 가장 우수하였다.

• 한국정보전자통신기술학회논문지
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• 제13권2호
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• pp.129-137
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• 2020

현재 자율주행 차량 시장은 3레벨 자율주행 차량의 상용화를 넘어 4레벨 자율주행 차량을 연구, 개발하고 있다. 4레벨 자율주행 차량에서 가장 주목되는 부분은 차량의 안정성이다. 3레벨과 다르게 4레벨의 자율주행 차량은 긴급상황을 차량이 직접 대처해야 하기 때문이다. 본 논문에서는 긴급상황에서의 즉각적인 반응보다는 차량의 목적지가 정해진 순간 사고 가능성이 가장 낮은 경로를 결정하는 Optimized Vehicle Routing System (OVRS)을 제안한다. OVRS는 RSU 통신으로 수집한 도로와 주변 차량 정보를 분석하여 도로의 위험성을 예측하여 주행 중인 차량이 더 안전하고 빠른 길로 주행할 수 있도록 경로를 설정한다. OVRS는 네트워크 라우팅 방식처럼 도로에 있는 RSU를 통하여 도로 상황에 따른 경로 안내를 실행하기 때문에 차량의 안정성을 더욱 높일 수 있다. 실험 결과, OVRS모듈 중 하나인 ASICM의 RPNN은 CNN보다 약 17%, LSTM보다 약 40% 더 좋은 연산 시간을 보였다. 그러나 해당 연구가 PC를 이용한 가상환경에서 실행되었기 때문에, VPDM의 사고 가능성을 실제로 검증하지 못했다. 따라서 향후 사고 데이터 수집으로 인한 VPDM의 정확도 높은 실험과 실제 차량 및 RSU에서 실제 도로를 대상으로 한 실험이 진행되어야 한다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1080-1084
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• 2011

Urban maglev should have such characteristics as not only environmentally friendliness and excellent driving capability but also curve negotiation performance because its routes have many sharp curves. Due to normal mechanism of urban maglev its relative displacements of secondary spring are bigger than conventional railway vehicle and the centering force of levitation magnet is smaller than wheel-on-rail system. These features of maglev affect the curving negotiation and so the additional steering device is to be required on Urban maglev to improve the running performance at sharp curve of less than about R50m. Some developed urban maglev had the passive steering device which consists of mechanical linkage or hydraulic cylinder and closed-route piping. But it has drawback as complexity of layout of understructure of vehicle and functional limitation of passive mechanism regarding transient curve. These demerits could be solved by using active steering system. But it has a weak point that an active device should have actuators and additional inverter or hydraulic power source. In this paper, the semi-active steering system for urban maglev is to be introduced.

• International journal of advanced smart convergence
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• 제8권4호
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• pp.161-168
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• 2019

Traffic accidents in tunnel can lead to large traffic accidents due to narrow and dark road characteristics. Therefore, special care of the driver is required when is driving in a tunnel. However, accidents can happen at any time. In the event of an accident, a narrow road structure may lead to a second accident. Therefore, all facilities installed inside the tunnel should be allowed to minimize damage in the event of an accident. We confirmed the safety of the collision target through the action of the sedan, Sport Utility Vehicle (SUV) and truck when the vehicle crashed into a stairway installed on the tunnel emergency escape route, and when a concrete barrier or guard rail was installed in front of the stairway. The behavior of the vehicle has resulted in a total of three results: rollover or rollover, change of speed and angle of the vehicle after collision. The sedan and SUV were the most secure when colliding with the guardrail, but considering the truck as a whole, concrete barriers were judged to be the most suitable for minimizing damage from the first accident and reducing the risk of the second accident.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.1142-1146
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• 2004

The synthetic route and physical properties for three-ring derivatives, trans-2,3,2',3'-tetrafluoro-4-alkyl-4'-(4-alkyl-cyclohexyl)-biphenyl and 4-alkyl-cyclohexane carboxylic acid 2,3,2',3',4'-pentafluoro-biphenyl-4-yl ester are presented. They exhibit broad range nematic phases exceeding 30K and low viscosity of nematic liquid crystal mixtures containing these materials. Their viscosity is compared with that of homologues with a lateral isothiocyanate group and show large negative dielectric anisotropies. The threshold voltage $V_{th}$ was low enough to be operated at a driving voltage of 5V. Our novel LC compounds are suitable materials for the improvement of dielectric anisotropy of vertical align liquid crystal displays (VA-LDCs).

• 한국환경보건학회지
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• 제38권5호
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• pp.393-397
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• 2012

Objectives: The objectives of this study were to measure passengers' exposure to ultrafine particles (UFP) and to determine effects of fuel, operating condition and position of seat. Method: UFP exposures in front and back seats of the Elephant vehicle in Seoul Grand Park were simultaneously measured by a condensation particle counter (P-Trak model 8525, TSI). The measurements were conducted 7 times with diesel-powered vehicle and 3 times with electricity vehicle in one day. The vehicle stopped at 3 locations along with 2.2 km of driving route. Results: UFP concentration in diesel-powered vehicle was significantly higher than electricity vehicle. At front seat of diesel-powered vehicle, average UFP exposure during stopping was significantly higher than during moving. When diesel-powered vehicle moved, UFP exposure in back seat was significantly higher than in front seat. Conclusions: Passengers in the diesel-powered Elephant vehicle could be exposed to high level of UFP. The UFP exposure was associated with operation condition and position of seat.

• 대한교통학회:학술대회논문집
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• 대한교통학회 1995년도 한-중 국제학술회의 발표논문
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• pp.69-76
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• 1995

"승차난", "행차난", "정차난"시세계각국재성시화화성시현대화발전 중필연회출현적일개공동적문제,단치리적방법각불진상동. 본문근거상해적실 천,제출료파영향도로교통용량화운행질량적각충인소,종공제교통출행적산생. 개선교통출행적분포, 합리선택출행적방식, 과학선택출행적로선여출행적시간, 대력가강교통관리화도로건설등칠개방면진행통주협조, 종합치리적교통계통관리 기출.병지출타시대도시교통주출곤경적일충투자소, 견효쾌적유효방법.

• 지식경영연구
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• 제15권3호
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• pp.189-208
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• 2014

In spite of its popularity among practitioner and academic audiences, few existing studies go into any detail in examining the mechanisms of creating shared value (CSV), especially as applicable to the context of everyday operations. Nor do they provide recommendations to practitioners with regard to facilitating CSV concept. In response to this problem, I introduce benefit-sharing practice which I argue provides a solid route to the concept of CSV. Based on observations from the case study, 10 networks' benefit-sharing practices are analyzed and its featured characteristics are extracted accordingly. Findings demonstrate that such benefit-sharing models as 'Green-Development', 'Protection of the Environment', and 'Accreditation for Food Safety Management' can solve critical societal challenges while simultaneously driving greater profitability for both buyers and suppliers. The findings also suggest that benefit-sharing is a good vehicle of the realization of the CSV concept. I conclude by assessing how the findings add to the existing debate around collaborative supply-relationship and shared value. I suggest that benefit-sharing can contribute positively to the feasibility of CSV concept and, thereby, counter the assertion that CSV is the only immature-concept that lacks clear criteria of demarcation and cases for businesses to follow.

• 대한교통학회:학술대회논문집
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• 대한교통학회 1995년도 한-중 국제학술회의 발표논문
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• pp.61-68
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• 1995

진쾌파상해건성국제경제, 김융, 무역중심지일, 저시상해성시적발전 목표o실현저개목표,수요유합리적성시총체포국여완선적종합교통체계. 상해시일개구유복잡공능급특정지리조건적특대성시,기발전필연요유 일개괄응뉴합형포국결구적성진체계. 중심성구요안조 "다심개폐식"적 포국결구래조정, 우화토지사용공능. 규화건설호완선적성시종합교통체계,요십분중시항구건설,가강심수 항, 항공항, 신식항적건설;하결심건설호포괄쾌속철로, 고속공로재내적 쾌속교통체계, 완선지함, 지하, 고가상결합적공공교통망락;명학교통정 책여강화규화관리, 사해결교통여합리포국긴밀결합기래.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1428-1432
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• 2007

One of the most important targets of transportation is to transport human and commodities to the destination safely. Railway has low risk, compared with land, ocean and flight route and it assures high security as well as high speed driving, since it runs on regular track. However, train accident may result in tragic accident due to small carelessness, so special event recorder is preferably used in order for clarity of responsibility in case of accident, maintenance of signal device and defect analysis. JRU(Juridical Recorder Unit) for ATC/ATS/ATP can be more advanced event recorder. Event recorder of KTX-I which is running now is installed one by one on each leading car and last car, and operation plan of event recorder in case of single trainset is suggested. But regarding train operation of multi-coupled trainset operation such as KTX-II, more detailed study is required for event recorder revitalization and record data process method. Therefore, this research aims at operation plan used in existing event recorder, and suggests effective operation and management plan of event recorder in multi-coupled trainset such as new High Speed Train.