• 한국안전학회지
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• 제30권6호
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• pp.139-147
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• 2015

This study deals with actual commuting distance and influence of risk factors depending on commuting distance and mode in order to reestablish actual commuting zone of primary school students. Data mining analysis(CHAID) was applied for this reestablishment using survey results from 6,927 primary school students in Seoul Metro. Six risk factors; convenience level of commuting path condition, convenience level of road crossing condition, vehicle speed on commuting path, segregation level between commuter and vehicle, congestion level of commuting path, and public security level and two mode; walking and cycle are considered in the analysis. As the results of CHAID analysis, commuting distance was divided into four zones; Internal Zone(0.491km under), External Zone(0.492 ~ 1.492km, 1.493 ~ 2.699km), Commutable Zone(2.70km over), and awareness level on safety is declined as commuting distance is increased. The risk factor affecting on safety is recognized differently by students depending on commuting distance and mode. For students commuting by walking, vehicle speed on commuting path and convenience level of commuting path condition are recognized as the prime risk factor within Internal Zone and Commutable Zone, respectively. For students commuting by cycle, convenience level of road crossing condition and vehicle speed on commuting path are recognized as the prime risk factor within Commutable Zone. Analysis results show that improved plan and program for commuting path for primary school students are required considering actual commuting distance and method.

• 대한교통학회지
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• 제27권2호
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• pp.169-178
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• 2009

본 연구에서는 수도권의 직장인들을 대상으로 통근행태와 건강과의 연관성을 규명하고자 하였다. 연구는 행정/사무/관리/연구직 등 대체로 앉아서 근무하는 직장인 1,285명의 통근행태뿐만 아니라 키와 몸무게, 혈압, 콜레스테롤 등 건강상태를 포함하여 설문조사한 결과를 분석하였다. 건강지수를 측정하는 방법으로는 통근행태를 통하여 신체활동의 운동량을 확인할 수 있는 통근수단, 이용기간, 차외시간, 총 통행시간, 환승여부, 대체수단 여부 등을 이용하였다. 분석결과 승용차를 이용하는 통근자에 비하여 비승용차를 이용하는 통근자들의 건강상태가 보다 긍정적인 것으로 나타났다. 특히, 버스와 도보를 이용하는 통근자는 비만 감소와 혈압, 콜레스테롤의 개선에 기여하고 있으며, 반면 지하철을 이용하는 통근자들은 비만과 콜레스테롤의 감소에 관련이 있는 것으로 나타났다. 또한, 승용차 이용기간이 긴 통근자는 비만과 혈압, 그리고 콜레스테롤이 보다 안 좋은 것으로 나타났다.

• 한국안전학회지
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• 제28권5호
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• pp.71-77
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• 2013

This Study aims at investigating actual condition on attending school road of children and analyzing empirically the characteristics of cognition and the influence of safety on school road. This study findings are as follows : 1) Walking alone to go to school is the highest rates among Commuting Mode, and Commuting distance to school is nearly doubles than range of school zone(300 m). 2) Among characteristics of urban spatial structure affecting on influence classify safety of school road, 'Commuting Distance' has been drawn to most influential variable. Especially, there are 4 types classified by commuting distance and it became obvious that the longer the distance, the lower the safety score(under 127 m=76.9 points, Over 451 m=58.3 points). 3) As a result of investigating the influence of Safety on attending school road, Vehicle commuting speed urder 127 m as internal of school zone, and Walking and crossing convenience over 451 m as external of school zone have a lot of influence on safety cognition on school road. Therefore Safety on school road should be considering the commuting distance to school among surrounding characteristics, needed for improvement plan and program based on real safety cognition of children.

• 자동차안전학회지
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• 제15권4호
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• pp.79-87
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• 2023

In recent years, the population of children has been declining in Korea. Moreover, the phenomenon of elementary school closures is on the rise, particularly in non-urban and some new city areas, highlighting the need for school buses for children. Despite the mandatory safety features in place, accidents involving school buses for children are on the rise, underscoring the need for improvement in the safety of these vehicles. While various studies have been conducted to enhance the safety of children during their school commute, there has been a notable gap in research analyzing the school commuting environment concerning the vehicle safety of these buses. Hence, this study aims to develop a set of service evaluation criteria for school bus routes, considering vehicle safety through the Analytic Hierarchy Process (AHP). By conducting a survey to gather information on the current status of school buses for children and through questionnaires targeting stakeholders in the school bus sector, the study analyzed requirements and operating conditions. These results were used to select evaluation criteria and structure the hierarchy based on the external and internal aspects of school bus services. Through AHP surveys conducted based on the designed criteria, experts identified safety as the most crucial aspect, with a specific emphasis on Vehicle Safety. Using these developed service evaluation criteria, the study plans to identify service-vulnerable routes through a real route analysis and recommend improvements, with the ultimate goal of creating a safe and convenient school commuting environment for children.

• Environmental Engineering Research
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• 제14권3호
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• pp.180-185
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• 2009

Only limited information is available as regards to the exposure levels of naphthalene (polycyclic aromatic hydrocarbons, PAHs) and monocyclic aromatic hydrocarbons(MAHs) in the interiors of diesel-fueled passenger cars, while many studies investigated the exposure levels of various volatile organic compounds(VOCs) in the interiors of gasoline-fueled passenger cars or public buses. Present study was performed to supplement this deficiency by measuring naphthalene (as a representative of PAHs) and MAHs levels inside five diesel-fueled and five gasoline-fueled passenger cars while morning and evening commuting on real roadways. Each car was surveyed five times on different sampling days. The in-vehicle naphthalene levels were higher for the diesel-fueled cars as compared to gasoline-fueled cars, whereas the results were reversed for the in-vehicle MAH levels. The median cabin levels of diesel-fueled cars were 1.3, 7, 13, 4, and 6 ${\mu}g/m^3$ for naphthalene, benzene, toluene, ethyl benzene, and m,pxylene, respectively. With respect to gasoline-fueled cars, their respective levels were 0.7, 11, 21, 7, and 9 ${\mu}g/m^3$ . The median MAHs concentration ratios of gasoline-fueled cars to diesel-fueled cars ranged from 1.50 to 1.75, while the median naphthalene concentration ratio was estimated to be 0.54. In addition, there was no significant difference of both naphthalene and MAHs between the diesel-fueled cars, but the in-vehicle levels were significantly different between gasoline-fueled cars. The concentration levels of both naphthalene and MAHs were higher in the passenger cars than other non-industrial microenvironments. Consequently, it was confirmed that the cabins of both diesel-fueled and gasoline-fueled passenger cars are an important microenvironment associated with the exposure to naphthalene and MAHs.

• 한국항공운항학회지
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• 제30권4호
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• pp.23-32
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• 2022

Prototype UAMs are shown to us in the market. When the complete product is delivered to market, the efficiency of each UAMs can be compared by default. Before the complete product is shown to us, the comparative study on efficiency of UAMs is performed under the product cost estimation. The efficiency analysis result reveals that both of Lift & Cruise type and vectored thrust type show good efficiency at the initial stage of product. At the near terms stage, five years later from initial stage end, efficiency gets some change. Vectored thrust type of UAMs show best efficiency at the near term stage of product. Because UAMs will be used in urban area, Seoul is the place where the UAMs will be used first. The flying route from Seoul City Hall to Yongsan Park, National Assembly in Yeouido, and City Airport is no more than 10 km distance. For this short distance route, efficiency will make multi-rotor type UAM be prefered to other types. For long distance route or commuting route, life & cruise type and vectored thrust type of UAMs will be prefered on account of operational efficiency.

• 한국대기환경학회지
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• 제17권4호
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• pp.321-329
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• 2001

This study included three experiments to evaluate in-vehicle exposures to PM10 and CO: 1) evaluation of in-passenger car exposures, 2) evaluation of in-public bus exposures, and 3) simultaneous evaluation of in-passenger car and in -university bus exposures. The tests of four factors (transportation mode, passenger-car type, commute period, and commute season were focused. A total of 40 actual passenger car commuters, 20 public bus commuters, and four university buses were recruited or surveyed. The same commuters ware participated in both the summer and winter studied. Two factory such as transportation mode and passenger-car type were found to have little effect on the in-vehicle levels of PM10 and CO. Commute period was found to have little effect on the in-vehicle CO levels. Conversely, the other factor, commuting season was found to influence on the in-vehicle levels of PM10 and CO. The present study also confirmed that under the Korean commute conditions, vehicle interiors are an important microenvironment for exposure to PM10 and CO. This was supported by finding that the in-vehicle Air levels were much higher than ambient air levels reported by several previous studies. The mean in -vehicle PM10 concentrations were 114 and 103$\mu\textrm{g}$/m$^3$for passenger cars and public buses, respectively. For CO, the mean in-vehicle concentrations were 2.9 and 2.6 ppm for passenger cars and public louses, respectively.

• 한국항행학회논문지
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• 제23권4호
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• pp.265-272
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• 2019

본 논문에서는 우리나라에서 가장 교통이 혼잡한 수도권에서의 출퇴근 시나리오를 선정하고, 미국연방항공국에서 개발한 AEDT (aviation environmental design tool) 소트프웨어를 사용하여 PAV (personal air vehicle) 운용 시 발생하는 소음분석을 수행하였다. 미항공우주국에서 선보인 ODM (on-demand mobility) 개념에서 PAV를 운용하기 위한 안전성 다음으로 소음이 중요한 고려요소이다. PAV의 정확한 NPD (noise power distance) 데이터가 공개되어 있지 않는 문제를 해결하고자 eVTOL (electric vertical take off and landing) PAV와 같은 저소음 PAV를 민간용 헬리콥터로 모델링하여 소음 분석을 수행하고, 해당지역의 주거 적합성을 예측하였다. 전기추진과 같은 소음 감소 기술의 적용은 소음 노출 레벨을큰 폭으로 감소시켰고, 수도권내에서 소음문제 없이 PAV를 이용한 출퇴근이 실현 가능하다는 결론에 도달하였다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 춘계학술대회
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• pp.428-430
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• 2018

유치원이나 어린이집 통학 차량의 탑승 사고는 여러 가지 정책적 조치에도 불구하고 꾸준히 발생하고 있다. 이를 최소화하기 위해서는 운전자가 간편하게 조작할 수 있는 차량 탑재형 안전 통학 관리 소프트웨어와 아동의 안전 통학 여부를 관리하고 부모에게 적시에 알려주는 모바일 앱의 병행 사용이 필요하다. 본 논문은 이 중 안전 통학 관리 모바일 앱의 설계와 구현에 대하여 설명한다.

• 한국ITS학회 논문지
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• 제23권5호
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• pp.117-136
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• 2024

수요응답형 대중교통(이하 DRT, Demand Response Transit)은 스마트폰 앱과 차량단말 등을 활용하여 이용자호출에 따라 가변적인 노선으로 운행되는 대중교통이다. DRT는 호출 후 대기시간, 탑승지점 접근시간, 차내통행시간, 우회통행시간, 하차 후 도달시간 등이 운행방식에 기반한 이용자 선호요인이 발생된다. 본 연구는 SP조사를 통해 시민들이 위 요인 중 어떤 요인에 가장 민감하게 반응하는지 조사하였다. 조사는 5개의 속성변수로 구성된 2개의 DRT 대안을 제시하여 보다 선호하는 수단을 선택하도록 하였으며, 출퇴근 상황과 여가 상황 2가지 상황에 대한 응답을 조사하였다. 분석결과 출퇴근시에도 여가시에도 호출 후 대기시간이 가장 큰 선호요인이었으며, 탑승지점 접근시간은 가장 약한 영향요인인 것으로 분석되었다. 단, 우회통행에 대한 민감도는 출퇴근 상황에서 여가시간 대비 2배 이상인 것으로 나타났다. 본 연구의 결과는 DRT 운영 시 시간대에 따라서 최적화 목표를 차별화하여 이용자 만족도와 시스템 효율성을 향상시키는 데 기여할 것으로 보여진다.