• 한국위성정보통신학회논문지
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• 제2권2호
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• pp.69-74
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• 2007

최근 이동환경에서의 고속 위성통신 서비스에 대한 요구가 증가하고 있다. 이러한 요구를 만족시키기 위해 유럽 및 북미지역에서는 지난 수년간 Ku대역을 활용한 고속이동체 대상의 이동형 위성통신 시스템 개발이 활발히 진행되고 있다. 하지만 기존의 이동형 위성통신 시스템은 수십 Kbps 정도의 전송속도를 제공하기 때문에 고속열차와 같이 다수의 그룹 사용자들을 대상으로 한 위성 인터넷 서비스 제공에 한계가 있다. 또한, 철도 운행구간에서 발생하는 N-LOS 환경에 대처하는 기술의 부재로 서비스 가용도가 크게 저하된다. 본 논문에서는 고속열차 승객을 대상으로 위성무선연동 전송기술을 이용하여 지상무선망과 동일한 수준의 끊김없는 인터넷 서비스를 제공하기 위한 이동형 광대역 위성 인터넷 접속 시스템에 대해 기술한다. 고속열차를 대상으로 이러한 서비스 제공을 위해서는 터널이나 역사(Railway Station)와 같은 N-LOS 환경에 대한 대처기술이 필요하며, LOS 환경에서도 철로상에 설치되어 있는 Electric Power Post 나 Power Bridge 등으로 인한 주기적이고 짧은 시간 동안의 신호열화 현상이나 고속 이동에 따른 도플러 현상에 대한 극복기술이 필요하다. 이를 위해 본 시스템에서는 안테나 다이버시티 기법 및 갭필러와 지상무선망과의 연동기술이 적용되어야 하며, 상위 레이어에서의 에러 정정 기술이 적용된다. 본 논문에서는 위와 같은 기술이 적용되어 고속열차 승객들을 대상으로 한 위성인터넷 서비스 기술에 대해 기술한다.

• 한국철도학회논문집
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• 제16권6호
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• pp.540-550
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• 2013

본 논문에서는 철도통신시스템을 위해 필요한 주파수 소요량을 계산하기 위한 방법을 제안한다. 철도통신시스템을 위한 주파수소요량 계산에 최적화된 방법을 유도하기 위하여, 먼저 기존의 일반 이동통신시스템의 주파수 소요량 측정에 사용되었던 방법인 ITU-R M.1390을 분석한 후, 차세대 철도통신시스템에서 요구하는 서비스들을 세분화하여 정의하고, 철도통신을 위해 수정된 주파수 소요량 프로세스를 제안한다. 그리고 실제 현장조사를 통해 습득된 장비정보들을 제안한 계산방법에 적용하여 현재, 5년 후, 10년 후 시점의 예상 주파수 소요량을 계산한다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 추계학술대회
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• pp.457-460
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• 2018

이동통신기반 열차제어 시스템은 열차의 차상장비와 선로변 지상장비간 연동을 유선통신을 이용하지 않고 이동통신을 활용하여 열차의 운행을 제어한다. 기존 열차제어는 열차의 점유 정보, 열차 무결성 정보 그리고 이동권한을 유선통신 기반의 고정 폐색 방식 기반으로 운영하고 있다. 최근 들어 철도 영역에서 이동 통신 시스템을 도입함에 따라 향상된 승객 서비스를 제공할 수 있을 뿐 아니라, 비효율적 차상과 지상 설비를 무선통신으로 대체함에 따라 높은 경제적 혜택을 제공할 수 있다. 본 논문에서는 각국에서 현재 운용중인 이동통신 기반 열차제어 시스템을 소개하고 각 시스템에서 사용하고 있는 무선 통신 방식의 특징과 운영 현황에 대해서 설명한다. 또한 무선 통신 시스템의 최소 성능 요구사항 연구를 통하여 열차 제어 신호가 무선망을 통하여 더욱 안전하고 효율적으로 전달될 수 있는 방안을 제시한다.

• International Journal of Internet, Broadcasting and Communication
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• 제13권4호
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• pp.112-120
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• 2021

Recently, the number of consumers using digital online distribution platforms is increasing. This caused the rapid growth of the e-commerce market and increased delivery volume in urban areas. The logistics system, designed ar006Fund the city center to handle the delivery volume, operates a delivery system from the outskirts of the city to the urban area using cargo trucks. This maintains an ecosystem of high-cost and inefficient structures that increase social costs such as road traffic congestion and environmental problems. To solve this problem, research is being conducted worldwide to establish a high-efficiency urban joint logistics system using urban railway facilities and underground space infrastructure existing in existing cities. The joint logistics system begins with linking unmanned delivery automation services that link terminal delivery such as cargo classification and stacking, infrastructure construction that performs cargo transfer function by separating from passengers such as using cargo platform. To this end, it is necessary to apply the device to the vertical and horizontal transportation machine supporting the vertical transfer in the flat space of the joint logistics terminal, which is the base technology for transporting cargo using the transfer robot to the destination designated as a freight-only urban railway vehicle. Therefore, this paper aims to derive holistic viewpoints needs for design requirements for vertical and vertical transportation machines and freight transportation standard containers, which are underground railway logistics transport devices to be constructed by urban logistics ecosystem changes.

• Journal of East Asia Management
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• 제3권2호
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• pp.21-41
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• 2022

This study aims to analyze the characteristics of the management situation of the Korea Railroad Corporation(KORAIL) through the management innovation process of the KORAIL and to suggest its implications for military application. Despite stable demand, the railway passenger industry had the limitation of not being able to abolish deficit routes due to public service obligations. In addition, the launch of the Suseo High-Speed Line has introduced a competitive system, posing a threat to corporate management. KORAIL wanted to overcome this crisis by innovating its management through the utilization of big data, improvement of the freight business, decentralization of demand, the introduction of tourism railroads, and development of station influence areas. By utilizing big data, KORAIL was able to optimize the railway fare system while reducing fixed costs spent on railway maintenance. It also drastically reduced the station of cargo and created a base station to pursue economies of scale. On the other hand, the existing exclusive station system was abolished to solve the chronic saturation of the downtown area, and the railway demand was moved to Gwangmyeong Station and Suwon Station to optimize the passenger supply. In particular, it developed a new business model called the tourism railway by developing the mountain Byeokjin Line, which was a chronic deficit line, and sought to improve liquidity through the development of the station influence area. Such a process of innovation at KORAIL suggests an appropriate direction in seeking ways to innovate the military medical institutions. First of all, the necessity of improving organizational immersion through the development of a personnel structure suitable for the compulsory organization, while expanding the facilities of the division and corps, and reducing the time required for medical treatment and waiting through the establishment of a data-based medical system was suggested. Next, it was also discussed to integrate the National Health Medical College, which received accreditation as a medical facility through the designation of advanced general hospitals and is ultimately under discussion with the Medical Institution. Through this, we hope that the military medical institutions, which are facing various challenges, will overcome existing limitations and be re-lighted as innovative institution that provides comprehensive public health services.

• 한국전자통신학회논문지
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• 제11권8호
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• pp.729-734
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• 2016

현재 국내 철도 무선통신망은 구간별로 VHF, TRS-ASTRO, TRS-TETRA 등의 서로 상이한 통신방식을 사용하여 정보를 송수신하고 있다. 최근에는 다양한 서비스를 제공하고 신뢰성을 향상시키기 위해 LTE방식을 철도 무선통신에 적용하는 연구가 진행 중에 있다. 다양한 통신방식을 사용하는 철도 무선통신망에서 끊김 없는 정보전송을 제공하기 위해서는 기존 통신방식과 새로운 통신방식 간의 연동이 필수적이다. 본 논문에서는 두 가지 망 연동방안, 즉 단말기 중심의 연동방안 및 망 중심의 연동방안에 대해 소개한다. 두 가지 연동방안을 이용한 운용시나리오에 대해 알아보고 두 가지 방안의 차이점을 비교한다. 또한 실제 시스템 적용시 고려사항에 대해서도 논의한다.

• 한국항만학회지
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• 제8권1호
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• pp.49-63
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• 1994

The introduction of high speed railway system a significant impact on the conventional inter-urban transport systems by inducing a significant traffic from the existing modes as well as generating a new traffic. It is also closely related to intra-urban transport systems as the inter-urban traffic has its origin and destination in a city. In the context of mode choice, for high speed transport systems, it has been argued that the accessibility is the most important attribute conceived by users. Thus this study attempts to analysis the importance of the accessibility for the planned high speed railway systems particularly with respect to the location of Busan Station. For this Stated-Preference approach, which is considered appropriate for such study, is adopted, and disaggregate binary logit models for mode choice between the high speed railway and air service in Busan-Seoul corridor are developed. The elasticities for cost and service variables are also derived. The results disclose that cost is the most important which is inconsistent with most previous studies ; accessibility has considerable impact on the choice ; and frequency however has a little impacts. Concerning location of the high speed railway station the results suggest that the longer the access distance is, the more important the accessibility is. This implies that the connection of reliable access transport services such as underground are essential between the terminal and urban center.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 춘계학술대회 논문집
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• pp.222-231
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• 2003

After the reform of rail industry, a system to evaluate service qualities is required for the continuous improvement of railway service and the strength of competitiveness. This research provides evaluation categories and indices which are considered to be suited to the evaluation of rail service qualities. This study provides 4 categories and 11 indices to assess the rail service qualities: provision-operation interval/average operation speed, reliability-regularity/operation cancellation rate, safety- train usage term/facilities for the weak, client satisfaction- easiness of reserving and purchasing of tickets/comfort of queuing facilities/ kindness of train crews/ pleasantness of trains/provision of information, etc.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 춘계학술대회 논문집 에너지변화시스템부문
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• pp.186-188
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• 2009

Safety-critical systems related to the railway communications are currently undergoing changes. Mechanical and electro-mechanical devices are being replaced by programmable electronics that are often controlled remotely via communication networks. Therefore designers and operators now not only have to contend with component failures and user errors, but also with the possibility that malicious entities are seeking to disrupt the services provided by theirs systems. This paper discusses the safety strategies employed in the railway communications and proposes a security mechanism for Korean railway communication system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.206-210
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• 2005

The Maglev system is environmentally friendless system, has excellent running capabilities and lower life cycle cost. The Maglev has been developed by Germany and Japan since 1970's. Then, Transrapid of Germany, super high speed type, had started for commercial operating at Sanghai of China in the early of 2004. In March of this year, HSST of Japan, urban type, had been serviced at Tobukyuro Line which links between Nagoya and Aichi. Recently, in Korea, Maglev system has been reviewed for commercial application.