• 한국철도학회논문집
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• 제19권4호
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• pp.539-546
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• 2016

본 연구에서는 개통 12년을 맞는 한국고속철도(KTX, Korea Train eXpress)를 대상으로 여객수요 증가 에 대해 새로운 시각에서 검증하고 이에 바탕하여 장래 KTX의 지속가능 운영방안을 고찰하고자 한다. 지속적으로 증가되고 있는 KTX 여객수요의 영향요인으로는 노선의 확대와 녹색성장을 통한 대중교통의 인식 전환 등이 될 수 있겠으나, 현재까지 KTX 관련연구는 이러한 점을 고려하지 못한 채 주로 여객수요 예측에 집중되어 왔다. 본 연구에서는 통행시간 감소로 인한 이용객의 사회적, 심리적 영향에 초점을 맞춘 요인을 고찰하였으며 이를 위해 확산이론 개념을 적용하여 여객수요 증가현상을 설명하였다. 소비자가 가지고 있는 정보가 다양한 네트워크를 통해 전파되는 현상인 확산효과는 제품선택과 구매태도에 영향을 미치는 마케팅학적 개념으로 이 영향이 KTX 이용에도 적용되어 여객수요 확산을 촉진시켰다는 가설을 설정하고 분석을 진행하였다. KTX 경부선을 대상으로 여객수요 증가에 기인하는 이용자의 사회적, 심리적 영향을 Bass의 확산모형(Diffusion Model)을 통해 분석하고 그 결과를 토대로 장래 KTX의 지속가능한 운영에 있어서 여객수요 향상을 위한 교통서비스의 마케팅적 정책추진이 가능하다는 시사점에 대해 고찰해본다.

• 대한공간정보학회지
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• 제1권1호
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• pp.117-125
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• 1993

GSIS는 분석될 수 있고, 또 특별한 목적이나 응용을 위한 정보로 변환될 수 있는 공간적 참조 자료를 보유하는 시스템이다. GSIS의 핵심적인 특징은 자료를 분석하여 새로운 정보를 만들어 낼 수 있다는 것이다. 교통분야에 있어서 현재 중점을 두고 있는 것은 실시간 시스템과 결합한 GSIS를 구축하는 것이다. 교통 GSIS에 대한 요구는 환경이나 자원분야의 응용을 위해 설계된 전통적인 GSIS와는 매우 다르다. 교통 GSIS는 교통량 예측, 포장관리에 대한 능력을 포함할 필요도 있을 것이다. 지역적인 교통계획 모델은 실제 어떤 지역에 대한 인구, 고용, 수입, 가구수, 자동차 수요에 대한 목록을 정리하고 예측하는데 사용되는 모델이다. 본 논문에서는 행정경계, 토지이용도, 도로망, 학교 동사무소의 위치와 인구 같은 자료를 사용하였으며, 이들 자료는 교통량, 교통수요, 도로건설 시간을 분석하는데 사용되었다.

• Nuclear Engineering and Technology
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• 제43권5호
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• pp.413-420
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• 2011

In Korea, although the concept of dry storage system for PWR spent fuels first emerged in the early 1990s, wet storage inside nuclear reactor buildings remains the dominant storage paradigm. Furthermore, as the amount of discharged fuel from nuclear power plants increases, nuclear power plants are confronted with the problem of meeting storage capacity demand. Various measures have been taken to resolve this problem. Dry storage systems along with transportation of spent fuel either on-site or off-site are regarded as the most feasible measure. In order to develop dry storage and transportation system safety analyses, development of design techniques, full scale performance tests, and research on key material degradation should be conducted. This paper deals with two topics, structural analysis methodology to assess cumulative damage to transportation packages and the effects of an aircraft engine crash on a dual purpose cask. These newly emerging issues are selected from among the many technical issues related to the development of transportation and storage systems of spent fuels. In the design process, appropriate analytical methods, procedures, and tools are used in conjunction with a suitably selected test procedure and assumptions such as jet engine simulation for postulated design events and a beyond design basis accident.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2217-2224
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• 2011

The railway industry has well developed with Korea's economic growth as follows - Industrial railway's electrification in 1973, Seoul subway opening in 1974, Busan subway opening in 1985, High speed railway opening in 2004. But LRT as city transportation means has been faced with many difficulties. Looking at the LRT projects implemented until now, there are some issues like the transportation demand, the quality & safety of RS and facilities, the poor management of inhabitant complaints and the failure to maintain policy coherence. They have caused not only the project schedule to extend but also the project costs to increase, even to obstruct the project progress itself in some cases. These risk factors become the obstacle of LRT project's success, but it is said that more basic problem is the lack of risk management capability of competent authorities in railway business. Under these circumstance, Railway specialized Authorities and Local government have cooperated to identify various risk factors and to prepare the measures in advance, so we try to introduce this cooperation case, which will help other local government as an useful reference.

• 대한안전경영과학회지
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• 제3권3호
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• pp.77-86
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• 2001

An operational strategy for inventory control on finished goods in the distribution system has been given attention to many enterprises and many studies regarding this field have been done and is also on-going currently. Many of these studies represented a large scale distribution network with a unified formulation by using defined symbols. These methods have provided the systematic approach of the distribution network but they are impossible to applying the reality system due to not considering the service rate of demand and treating the shortage of inventory. In order to overcome these unrealistic problems, the novel safety stock policy of responding to customers' inventory distribution network is suggested. this paper explores the transportation between Central Distribution Center(CDC) and Regional Distribution Center(RDC). Especially, the relation of transportation cost between CDC and RDC and cost of inventory control according to safety inventory with service level are emphasized. We could obtain the good results of this study by determining the optimal safety stock considering the various variables and constraints.

• 항공우주시스템공학회지
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• 제6권3호
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• pp.19-23
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• 2012

"The FAA's Next Generation Air Transportation System" is a comprehensive overhaul of U.S National Airspace System to make air travel more convenient and dependable, while ensuring the flight is as safe, secure and hassle-free as possible. At its most basic level, NextGen represents an evolution from a ground-based system of air traffic control to a satellite-based system of air traffic management. This evolution is vital to meeting future demand, and to avoiding gridlock in the sky and at U.S airports. NextGen will open worldwide's skies to continued growth and increased safety while reducing aviation's environmental impact.

• 한국가스학회지
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• 제25권3호
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• pp.16-26
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• 2021

지구온난화 문제가 대두되어 세계 각국에서 수소전기차와 같은 친환경 자동차 보급이 증가하는 추세이다. 한국은 수소전기차 초기 시장 형성을 위해 차량 구매 시 보조금 지원, 세금감면 등 전폭적으로 지원하고 있다. 수소전기차 안전성에 있어 중요 핵심은 수소를 저장하는 내압용기로 정기적으로 검사해야 하나 기존 내압용기 검사소만으로는 수소전기차 내압용기 검사수요를 감당하기에는 역부족인 상황으로 수소전기차의 안전관리를 위한 내압용기 검사소 구축이 가장 중요하다. 이에 본 연구에서는 전기차 판매 데이터를 이용하여 Bass 확산모델의 혁신 및 모방계수를 추정하고, 이를 Bass 확산모델에 적용하여 수소전기차의 지역별 보급 대수 및 수소 내압용기 검사수요를 예측하였다. 그 결과 2040년 국내 수소전기차 검사수요는 690,759대로 이를 대비하기 위해서는 191개소의 신규 수소전기차 내압용기 검사소와 검사인력 1,124명이 필요한 것으로 확인되었다.

• 한국항공운항학회지
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• 제22권1호
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• pp.32-43
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• 2014

Worldwide, air transport demand of this century is expanding rapidly, and each countries' demand is also increasing. Thus a number of low-cost carriers emerged in existing air transportation business sector and airman qualification check work regarding aviation safety management is increasing too. As the remedy for the result of aviation safety audit by ICAO and FAA in 2001 that governmental activity for aviation safety had been performed by a small number of aviation safety inspectors, airman qualification inspection system implemented by airlines was improved and the government has established the system that authorized airman qualification inspectors check airmen qualification with airlines according to the international trend. This study suggests the need of improvement of airman qualification inspection system that existing inspection system as the means of safety management can be transferred to Operations Safety Inspection(OSI) activity which is compliant with international standards.

• 한국경영과학회지
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• 제19권3호
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• pp.63-79
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• 1994

Many vehicle fleet planning systems have been suggested to minimize the routing distances of vehicles or reduce the transportation cost. But the more considerations the method takes, the higher complexites are involved in a large number of practical situations. The purpose of this paper is to vehicle fleet planning system. This paper is considered multi-objective optimization. The vehicle fleet planning system developed by this study involves such complicated and restricted conditions as one depot, multiple nodes (demand points), multiple vehicle types, multipel order items, and other many restrictions for operating vehicles. The proposed algorithm is compared with the nearest neighbor heuristic (NNH) and the savings heuristic (SAH) algorithm in terms of total logistics cost and driving time. This method constructs a route with a minimum number of vehicles for a given demand. This method can be used to any companys which vehicle fleet planning system under circumstances considered in this paper.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.1007-1012
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• 2008

Demand for the highly efficient and high performance urban energy supply system having been continuously increased according to the rise of quality of life and continuously increased energy cost all over the world. The district heating and cooling system is very effective way for energy saving, cost reduction, and demand side management of energy. There are several district cooling supply technologies such as chilled water direct transportation, installation of absorption type chiller in the user side, and desiccant cooling. This study investigates the advantage and technical problems of each district cooling technology. Also, it is necessary political and financial support system for the extension of district cooling system.