• 한국콘텐츠학회논문지
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• 제11권8호
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• pp.459-467
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• 2011

버스이용 활성화를 목적으로 구축되어진 버스정보시스템(Bus Information Systems)은 정류소에 설치한 버스안내단말기(Bus Information Terminal)를 통하여 버스대기자에게 버스도착정보 등을 제공하고 있다. BIT는 도심곳곳에 산재한 정류소에 설치되어 시민들이 직접 사용하는 장치이므로 고장 파손 등의 신속한 대응이 BIS운영에 중요한 요소로 인식된다. 이에 본 논문에서는 이러한 유지보수비용을 자체적으로 충당할 목적으로 BIT화면에 민간광고를 게재할 경우를 가정한 후, 조건부가치측정법(Contingent Valuation Method)을 적용하여 적정수준의 광고료를 파악하였다. 또한, 다항로짓모형(Multinomial Logit Medel)을 이용하여 버스이용자시간대별 이용자 특성을 분석하였으며, 이용자의 성별 및 연령을 고려한 시간대별 BIT광고게재 전략을 제시하였다.

• International Journal of Automotive Technology
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• 제7권7호
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• pp.841-846
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• 2006

This paper presents a numerical approach to optimizing vehicle fuel economy in a higway bus. The method described is based on using a commercial software vehicle simulation to identify the relative efficiency of each of the vehicle systems, such as the engine hardware, engine software calibration, transmission, cooling system and ancillary drives. The simulation-based approach offers a detailed understanding of which vehicle systems are underperforming and by how much the vehicle fuel economy can be improved if those systems are brought up to best-in-class performance. In this way, the optimum vehicle fuel economy can be provided to the vehicle customer. A further benefit is that the simulation requires only a minimum number of vehicle testing for initial validation, with all subsequent field test cycles performed in software, thereby reducing development time and cost for the manufacturer.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 추계학술대회논문집 - 한국공작기계학회
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• pp.489-494
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• 2000

In the high speed driving conditions, the vibrational phenomena with relation to chassis system are becoming more important factors in chassis design and development. In this paper Commercial Dynamic program is used to model middle size bus for brake judder phenomenon. To verify the effects of a body structure in brake judder, body structure is modeled in flexible. Also mode shapes and frequencies are obtained from Commercial FEA program in the same condition of experimental test. The simulation results are compared to the experimental results and summarized

• 한국자동차공학회논문집
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• 제14권5호
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• pp.181-185
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• 2006

A study to get better vehicle fuel economy is described based on an express bus. The approach is based on using a commercial software vehicle simulation to identify the relative efficiency of each of the vehicle systems, such as the engine hardware, engine software calibration, transmission, cooling system and ancillary drives. The simulation-based approach offers a detailed understanding of which vehicle systems are underperforming and by how much the vehicle fuel economy can be improved if those systems are brought up to best-in-class performance. In this way, the optimum vehicle fuel economy can be provided to the vehicle customer. A further benefit is that the simulation requires only a minimum of vehicle testing for initial validation, with all subsequent field test cycles performed in software, thereby reducing development time and cost for the manufacturer.

• 한국콘텐츠학회논문지
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• 제15권1호
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• pp.95-104
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• 2015

버스외부광고는 매체의 특성상 도시를 운행하며 불특정 다수에게 노출된다는 특성이 있다. 이는 단순한 기업의 이익을 위한 사적인 마케팅 활동을 넘어서서, 도시의 공공성에 영향을 미치게 된다. 서울시는 시내 버스 외부광고 운영 개선 계획을 통해 주류 및, 담배, 선정적 내용의 광고들이 점차 사라지고 있는 추세이나 공공성의 관점에서 살펴보아야 할 광고들도 여전이 있었다. 영국의 버스외부광고 현황 및 사례를 통해 버스 외부광고의 높은 노출성과 광고효과로 광고가 활발히 이루어짐을 알 수 있었다. 또한 버스외부광고 내용의 지침서를 정해놓고 관리 감독을 하고 있어 공공성 부분을 중요하게 다루고 있었다. 버스외부광고의 공공성을 '영역의 공공성', '주체의 공공성', '이유의 공공성', '절차의 공공성'으로 분류하여 그 의미를 설정하였다. 이를 통해 버스외부광고에 대한 적절한 규제 및 관리가 이루어질 때 사적인 영역인 버스외부광고의 상업적 권리와 시민의 권리인 공공성이 적절히 조화롭게 발전할 수 있음을 제언하였다. 도시환경관점에서 버스외부광고를 통한 예술적 접근이 미적향유와 시민의 디자인적 눈높이 향상에도 일조한다.

• 한국자동차공학회논문집
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• 제25권3호
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• pp.360-366
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• 2017

In commercial vehicles such as frame-based mid-size trucks, it is easy to reduce vibration caused by driveline with the cab mount system. There are no critical driveline vibration problems associated with these vehicles up to now. However, in the case of a similar grade of monocoque type mini-bus, there are no effective vibration isolation components such as a cab mount. Vibration caused by driveline is quite a complex problem to understand in terms of which part governs the phenomenon and how the problem can be solved. Thus, we have to manage the design factor about the driveline and mount system strictly at the early stage of vehicle development. Low frequency vibration caused by the driveline system is investigated in this study. We created the CAE driveline model and analyze low frequency vibration. Then contribution analysis about each design factor of driveline and mount system is performed. Finally, we can obtain the optimized design factor for a driveline system of a mini-bus, which is verified by the vehicle test results.

• 한국자동차공학회논문집
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• 제7권7호
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• pp.195-201
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• 1999

In Rollover crashes, the development of bus structure to ensure the maintenance of survival space for passengers is very important . So, this paper focuses on understanding the possibility of efficient structural development considering rollover strength through computer simulation using the commercial code, LS-DYNA3D at the initial stage of vehicle development structural members, and impact boundary conditions required by ADR59(Australian Design Rule 59)were applied. In order to confirm the validity of the computational results, the test results. After the usefulness of this method of analysis was confirmed , we have proposed the effective modificationfor rollover strength.

• 한국자동차공학회논문집
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• 제16권5호
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• pp.44-48
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• 2008

This paper describes on studies of the heavy duty engine calibration for better fuel economy based on real driving conditions. Using testbed validated software simulation of the engine and turbocharger system, an alternative turbocharger specification, with potential to improve fuel economy was identified. Secondly, the engine calibration was modified to optimize vehicle fuel economy over a typical customer drive cycle whilst still meeting the steady-state (testbed) emissions legislation. These results were confirmed by field testing of a vehicle equipped with the updated specifications. This study found good agreements between the prediction and the field test on the vehicle fuel economy improvements of the express bus with updated calibration and turbocharger.

• 자동차안전학회지
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• 제13권3호
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• pp.69-77
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• 2021

Although accident data from the National Police Agency and insurance companies do not know the vehicle safety, the damage level information can be obtained from the data managed by the bus credit association or the bus company itself. So the accident severity was analyzed based on the side impact accidents using accident repair cost. K-means clustering analysis separated the cost of accident repair into 'minor', 'moderate', 'severe', and 'very severe'. In addition, the side impact accident severity was analyzed by using an ordered logit model. As a result, it is appeared that the longer the repair period, the greater the impact on the severity of the side impact accident. Also, it is appeared that the higher the number of collision points, the greater the impact on the severity of the side impact accident. In addition, oblique collisions of the angle of impact were derived to affect the severity of the accident less than right angle collisions. Finally, the absence of opponent vehicle and large commercial vehicles involved accidents were shown to have less impact on the side impact accident severity than passenger cars.

• Journal of the Korean Data and Information Science Society
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• 제26권5호
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• pp.1061-1069
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• 2015

최근 교통 분야에서 발생하는 교통 빅데이터 (교통카드 데이터, ATMS 데이터 등)의 분석결과를 교통 정책에 활용하는 사례가 늘어나고 있는 추세이다. 또한 교통 데이터 분석 기법을 기존의 단순 빈도 분석 기법에서 다양한 데이터 마이닝 기법으로 확장하여 교통 데이터 속에 숨어있는 의미를 파악하려는 연구도 진행되고 있다. 본 연구에서는 교통카드 데이터에 대하여 토픽모델링 기법 중의 하나인 LDA (Latent Dirichlet Allocation) 기법을 적용하여 청주시 버스 승객들의 이동패턴을 분석한다. 이를 위해 교통카드 데이터의 하차 결측치를 추정하고, LDA 기법을 적용하여 이동패턴을 추출하였다. 또한 LDA 분석으로 도출된 값을 측정값으로 하여 다차원적 분석을 함으로써 청주시 버스 승객들의 이동패턴 특징을 파악할 수 있다. 분석 결과, 청주시의 경우 크게 1) 시외지역에서 터미널을 이용해 청주시에서 유입되는 패턴, 2) 주거지역에서 상업지역으로 이동하는 패턴, 3) 청주 인근 학교에서 상업 지역 (청주 중심가)로 이동하는 패턴을 발견할 수 있었다. 이동패턴은 도시 계획, 대중교통서비스 향상, 버스 노선 신설 등 다양한 교통정책의 수립에 활용될 수 있을 것으로 기대된다.