• 한국산업정보학회논문지
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• 제23권6호
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• pp.39-46
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• 2018

국내 저상버스 서비스는 2004년부터 최근까지 이동이 불편하고 휠체어를 탑승한 교통약자를 위해 전국적으로 보급되고 있다. 하지만, 저상버스 운행 정보가 미비하여 교통약자가 이를 이용하기에는 어려운 점이 많은 실정이다. 따라서 휠체어를 탑승한 교통약자의 저상버스 이용률을 증가하기 위해 교통약자를 위한 저상버스 이용 서비스 개선이 필요하다. 본 논문에서는 휠체어를 탑승한 교통약자의 저상버스 이용 서비스를 개선하기 위해 저상버스의 운행 정보와 탑승하고자 하는 저상버스에 탑승예약을 할 수 있는 서비스를 제공하기 위한 저상버스 탑승예약 시스템을 설계하고 구현하였다. 본 논문의 시스템을 적용하게 되면 저상버스를 이용하는 교통약자들에게 보다 좋은 서비스를 제공할 수 있을 것으로 기대된다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 춘계학술대회
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• pp.518-521
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• 2018

대중교통 이용이 증가되면서 버스정보시스템을 통해 수집되고 있는 사물인터넷 데이터를 활용하여 사용자의 편의성을 고려한 연구들이 진행되고 있다. 하지만 교통약자가 저상버스를 이용하기 위해 제공되는 시스템은 일반 사용자에게 제공되는 시스템에 비해 미비한 편이다. 교통약자가 일반 사용자들처럼 저상버스를 원활하게 이용하기 위해서는 교통약자를 위한 서비스 시스템이 필요하다. 이에 본 논문에서는 교통약자가 저상버스 이용을 편리하게 할 수 있도록 서비스하기 위한 저상버스 탑승예약 시스템을 설계한다.

• 도시과학
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• 제7권2호
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• pp.1-9
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• 2018

In this study, Analysis of DRT model and contribustion based on the case of local governments adopting the Demand Responsive Transit(DRT) in order to provide transportation in public transportation service weak area. Based on the case of Yeoju Area, the contribution of the DRT was analyzed. The DRT model was established as a fixed and call type model with taxi and bus transportation. Based on the results of the happy taxi service in Yeoju Area in 2016, the contribution of DRT was analyzed. According to the happy taxi performance of Yeoju city, it was introduced to 27 villages, and operated 4,188 times. And 9,111 people used it and Yeoju Area supported about 53 million Won. The contribution of local governments was analyzed in terms of local government, users, and social aspects. On local government aspects, we analyzed the budget cuts and complaints resolution. On the user aspects, we analyzed waiting time reduction, walking time reduction, travel time reduction, comfort, punctuality, and stability. On social aspects, we analyzed taxi and regional economy activation, and convenience of mobility.

• 한국안전학회지
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• 제12권4호
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• pp.86-92
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• 1997

Demand of LPG and LNG will increase continuously due to high calories, clearness, and convenience for usage. These gases are used widely for power plants, industrial plants, and domestic fuel. But accidents related with gas are increasing in proportion to increment of gas usage. Especially LPG has high ignitability due to weak dispersion to air and accumulation at low place because LPG is heavier than air. There are many hazards during transportation as well as production, storage, and usage of LPG. Commonly, tank lorry is used for inland transportation of LPG. If tank lorry were to raise leakage incidents and then LPG released during transporting, the accidents cause serious effects on the environment as well as human damage of surrounding area. In this study, therefore, hazards which cause LPG of tank lorry to leak during transportation were identified and risk of LPG transportation was assessed quantitatively. Also, the result of this study might be a useful measure for predicting damage and preparing safe transportation strategies of LPG tank lorry.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2020년도 추계학술발표대회
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• pp.292-295
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• 2020

현대 사회에 들어서 급속도로 발달한 대중교통 서비스와 위치 정보시스템을 이용하여 사람들은 손쉽게 목적지로 이동할 수 있다. 최근 들어 네트워크를 이용하여 위치 정보를 제공하고 있지만 네트워크 취약계층과 같은 교통약자에게 이러한 서비스는 큰 효용이 없다. 본 논문에서는 위치 정보에 기반을 둔 대중 버스의 도착 정보와 거리측정 센서를 장착한 버스 알리미 단말 시스템을 제안한다. 제안한 시스템을 활용하여 대중교통 이용에 있어 소외된 교통약자에게 더욱 편리하고 접근성 높은 서비스를 제공할 수 있기를 기대한다.

• 대한안전경영과학회지
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• 제15권1호
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• pp.177-182
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• 2013

More and more medium and small enterprises do business across the world according to generalization of online shopping mall such as eBay and Amazon. But high export and import transportation cost make weak the price competitive power of medium and small enterprises products. Then this paper deals with the development of new business model which can reduce the transportation cost for global logistics through efficiently overcoming the constraints as length, size, and weight of product. We explain this model with application for company which export the automobile parts. We can expect the transportation cost reduction by 50%.

• 산업경영시스템학회지
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• 제26권4호
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• pp.56-62
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• 2003

Recently, in order to stay at predominance in the global infinity competition, most of companies have been reducing the cost in many fields of industry First of all, the reduction of the logistics cost have been recognized greatly as the company value rises. But, the current situation of domestic logistics cost is very weak compared with Japan, U.S.A., etc. A rate of logistics cost out of GDP is still high compared with the competitors. The reduction of the transportation cost from overall logistics cost is most urgent subject. One of the methods to make a domestic transportation system efficient is the consolidation. In this paper. we try to compare the consolidated transportation model for a cost reduction with individual case. We also analyze the efficiency of consolidated transportation using simulation program with Arena of System Modeling Company.

• 대한교통학회지
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• 제26권1호
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• pp.181-190
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• 2008

본 연구는 교통약자(어린이와 고령자)에 대한 보행속도 및 인지-반응을 포함한 보행특성에 관한 기초자료를 제공하고, 이와 같은 교통약자의 보행 특성을 반영한 보행 신호시간 모형을 개발하는 목적으로 수행되었다. 본 연구를 위하여 가상횡단보도를 이용한 현장조사를 실시하여 어린이 및 고령자의 보행특성에 관한 자료를 수집하였다. 자료를 분석한 결과 어린이가 고령자에 비해 보행속도가 높게 나타났고, 약 0.63 m/s, 0.57 m/s의 평균속도를 나타내었다. 그러나 인지-반응시간과 여유시간은 고령자가 어린이에 비하여 높게 조사되었다. 이와 같은 특성을 반영한 보행신호시간 산정모형을 개발하여 제시하였다. 개발된 모형에 대한 민감도 분석 결과 실제 보행행태에 적합한 결과를 얻었고, 이를 현재 사용되고 있는 경찰청 모형과 비교한 결과 대부분의 상황에서 현재의 모형보다 증가된 보행 신호시간을 제공하는 것으로 분석되었다. 본 연구결과는 향후 교통약자의 보행환경을 개선하는데 적용할 수 있고, 장기적으로는 교통약자의 이동성 증진에 기여할 것으로 판단된다.

• International Journal of Fluid Machinery and Systems
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• 제8권2호
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• pp.94-101
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• 2015

To investigate the influence of blade profiles on cavitation behavior in impeller of centrifugal pump, a centrifugal pump with five different blade profiles impellers are studied numerically. The impellers with five different blade profiles (single arc, double arcs, triple arcs, logarithmic spiral and linear-variable angle spiral) were designed by the in-house hydraulic design code using geometric parameters of IS 150-125-125 centrifugal pump. The experiments of the centrifugal pump have been conducted to verify numerical simulation model. The numerical results show that the blade profile lines has a weak effect on cavitation inception near blade inlet edge position, however it has the key effect on the development of sheet cavitation in impeller, and also influences the distribution of sheet cavitation in impeller channels. A slight changing of blade setting angle will induce significant difference of cavitation in impeller. The sharp changing of impeller blade setting angle causes obvious cavitation region separation near the impeller inlet close to blade suction surface and much more flow loss. The centrifugal pump with blade profile of setting angle gently changing (logarithmic spiral) has the super cavitation performance, which means smaller critical cavitation number and lower vapor cavity volume fraction at the same conditions.

• 대한안전경영과학회지
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• 제11권4호
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• pp.201-211
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• 2009

The types and quantities of Hazmat and Hazmat transportation are gradually increasing, keeping pace with industrialization and urbanization. At present the safety management for Hazmat transportation only considers reducing accident probability, but even when an accident involving Hazmat-carrying vehicles occurs, that is not regarded as a Hazmat-related accident if the Hazmats do not leak out from the containers carrying them. Thus the methods to reduce risk (Risk=Probability$\times$Consequence) have to be developed by incorporating accident probability and consequence. By using Geographic Information System (GIS), a technical method is invented and is automatically able to evaluate the consequence by different types of Hazmat. Thus this study analyzed the degree of risk on the links classified by the Hazmat transport pathways. In order to mitigate the degree of risk, a method of 7-step risk management on Hazmat transportation in railway industries can be suggested. (1st step: building up GIS DB, 2nd step: calculating accident probability on each link, 3rd step: calculating consequence by Hazmat types, 4th step: determination of risk, 5th step: analysis of alternative plans for mitigating the risk, 6th: measure of effectiveness against each alternative, and 7th step: action plans to be weak probability and consequence by the range recommended from ALARP). In conclusion, those 7 steps are used as a standardization method of optimum transportation routing. And to increase the efficiency of optimum transportation routing, optional route can be revise by verification.