• Journal of the Korean Society for Railway
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• v.12 no.6
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• pp.953-960
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• 2009

In the major operation section of urban railway, there has been occurred habitual delay, and delay propagation and spread to consecutive trains. Therefore, this delay cause the increase of operation time and irregular operation, also the increase of crowd and inconvenience to passengers. The railway operation plan is a promise to passengers and must have reliability. In the case of high frequency urban operation, dwell time have considerable influence on operational headway, so it is very important to efficiently plan and control the dwell time at stations. In this paper, the survey of the research on dwell time for urban railways is presented. The practical estimation model for minimum required dwell time, and the numerical example and validity are proposed.

• Journal of the Korean Society for Railway
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• v.11 no.5
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• pp.482-488
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• 2008

Seoul Metro Line 9 (SML9) will link Gimpo Airport to the Gangnam district opening in May 2009. SML9 has a new model in Korea constructed by metropolitan government and private company and operated by specialized public transportation service provider. SML9 is confronted with tough environment of stagnated public transportation and strong competitor, Olympic city expressway. Consequently SML9 must lead the maximum efficiency by using its material and human resource. Hereupon, I propose renovation plans from 3 viewpoints of operation field of SML9: Rapid-Local combination, close connection with other transportation and direct connecting service into Incheon Air-port Railroad(AREX).

• The Inventors News
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• no.51
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• pp.1-16
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• 2006

함께 즐기는 '여성 발명인 축제'열린다/이 가을을 여성 발명의 계절로/빠진 영구치, 임플란트 기술로 대신한다/국내 의약품 특허출원 외국 기업이 주도/웰빙 붐 타고 기능성 베개 출원 늘어나/토양오염 복원기술, 관심 높아져/기업 CI교체 따른 상표출원 급증/여성경제단체, 오세훈 서울 시장 초청 간담회 가져/'2006대한민국 발명특허대전' 개최/특허청, 중소기업 특허경영 지원단 발족/한국특허문헌, WIPO로 전세계 서비스 실시/APEC 여성지도자네트워크 회의 개최/'2006 특허기술 사업화 성공사례발표회'/세계최초 신개념 CTF기술 상용화/특허청, 제4회 발명 장학생 선발/김치, 러시아 모스크바에 진출한다/고속 주행 틸팅열차 특허로 인정/현직 공무원, 다양한 발명품으로 특허와 되다/자신만의 'TV채널' 선택 가능하다/전지산업, 이온성 액체 관련 특허로 안전하게/명확한 의견 제출로 효율적인 심판 진행/치매예방물질 2배인 김치 개발됐다/한국과학기술연구원 논문 특허심의제도 도입/'한국 오시면 KISS로 맞이합니다'/삼성전자, 중국 특허 마쓰시타 아성 깨다/싱가포르 수출 인큐베이터로 중소기업 해외시장 공략/특허청, 영남대와 지식재산역량 강화 위한 약정 체결/깎는 횟수 줄인 잔디, 세계최초 개발/순창군, 웰빙 고추장 특허출원/역사 속의 발명품/하루 10분 발명교실/특허Q&A/케이제이알텍(주)문승자 대표/한.일 변리사회 업무협정체결 25주년 기념식 개최/중소기업청, 하반기 18조원 신용보증 공급 계획/'2006 대만 국제발명품 전시회'서 한국 참가자 수상/'불났을 때' 긴급 대피 요령은?/아이디어 착상 및 발명 기법/창의성과 도전정신이 성공한 사업가 만든다/사탕을 탄생시킨 사람들/'휴대폰 특허료 1.3억불 내라' 중재 결정/'신발깔창 휴대폰 충전기'/휴대폰으로 광고 받고 무료 문자 이용 가능/아파트 저작권.특허 열풍 거세게 불어/'골다공증 예방 요구르트' 나왔다/갈증 느끼지 않아도 '물' 자주 마셔라/10월 '지재권 및 여성발명 창의교실' 개최안내/한국여성발명협회 회원사 발명품 가이드/함씨네토종콩종합식품, 특선 수상/

• Journal of Korean Society of Transportation
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• v.22 no.2 s.73
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• pp.177-193
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• 2004

최근의 화물자동차파업사태 등으로 우리나라 물류체계의 경쟁력제고를 위한 여러 가지 논의가 진행되고 있다. 그 중에서도 환경친화적이며, 사회적 비용이 저렴한 철도화물의 수송분담율을 높여야 한다는 의견이 많이 나오고 있다. 우리나라 물류체계의 근본적인 문제점은 도로운송량의 증가보다 트럭의 공급과잉으로 트럭운송사업자의 수익은 매우 낮고, 철도, 해운 등 대량운송수단의 분담율이 낮아 전체적인 수송효율성이 낮은 것을 들 수 있다. 이러한 문제점의 해결은 트럭의 과잉공급을 억제하고, 제조업 물류비 중 46.5%를 점하고 있는 운송비용을 절감하는 것이 핵심적인 방안이라고 하겠다. 이에 본 논문에서는 철도화물의 활성화와 우리나라의 철도구조개혁의 성공적인 추진을 위해서 우리와 지형조건이 비슷하고, 1987년에 철도민영화를 시행하여 현재 16년이 경과한 일본철도화물의 현황을 분석하여, 현재까지의 문제점을 밝히고 또한 우리나라의 철도화물수송정책에 시사하는 바를 정리해 보았다. 1987년 민영화 이후 일본철도화물수송현황을 보면 영업거리, 화차대수를 포함한 수송능력 감소로 수송량은 감소하였으나, 화물수송의 장거리와 추세와 컨테이너수송량의 증가, 인력감축으로 영업성적은 전반적으로 향상되고 있다. 문제점으로는 경영면에서는 낮은 생산성 그리고 노후장비 등으로 인한 높은 설비투자비지출, 선로사용료 등의 부담 등이 지적되었다. 운영상에서는 현재 선로를 소유하지 못하여 네트워크가 부족하여 자유로운 열차편성이 어렵고, 포워더 기능이 없어 현재 전체물량의 85%를 점하는 소운송구간에서 다른 운송주체간의 수송으로 일관수송서비스에 어려움이 있으며, 직접적인 영업을 하지 못하여, 새로운 수요창출에 어려움이 있다. 이러한 문제점의 해결책으로는 먼저 정부의 인프라에 명확한 책임분담과 이에 따른 지원이 필요하다. 이와 같은 철도화물활성화의 정책수립필요성의 배경에는 철도화물수송이 효율성과 환경친화성, 높은 안전성 등 사회적 비용을 감소시키는 장점을 가지고 때문이다. 철도화물운송회사도 현재의 수송기능과 함께 포워더로서의 기능을 가져야 할 것이며, 운임인하노력과 속도향상을 위한 노력을 계속하여야 할 것이다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.5
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• pp.103-109
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• 2018

One of the 5G goals is provide to high data rates for users moving at high speeds, such as trains. High mobility scenarios such as high speed train (HST) scenarios are expected to be typical scenarios for fifth generation communication systems. As the HST develops rapidly, it is necessary to transmit wireless communication data to train passengers, and the communication speed required by users is gradually increasing. HST users require high network capacity and stable communication services regardless of the location or speed of the HST communication system. Therefore, a transmission frame is constructed for the 5G mobile communication system in the mm band to be used for the fifth generation mobile communication, the HST communication system is implemented, and the performance of the wideband non-stationary MIMO HST channel is analyzed in the HST scenario.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.10
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• pp.1833-1839
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• 2017

Korea Railway is enhancing the railway wireless communication system from VHF and TRS which have been used for 100 years to LTE-R starting with Ministry of Science and ICT's allocation of Integrated Public Network Frequency on December 2014. LTE-R has advantages on technology performance, also on ease of evolution based on standardization compared to existing technologies. However there are few problems that need to be solved to provide stable railway wireless services in the future. Due to national spectrum policy, LTE-R has frequency interference with Integrated Public Networks (PS-LTE, LTE-M ) and UHD-TV which was commercialized in 2017. This paper introduces performance changes caused by interferences which were founded from the test bed in Wonju~Gangneung LTE-R project and the result of RAN-Sharing. In addition, this paper suggests the standard for LTE-R cell planning in the case of sharing the Integrated Public Network Frequency by analyzing the changes of designed link-budget factor based on the test result.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.145-147
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• 2018

As mobile devices increase use, users are forced to recognize and navigate their own location and virtual space within a given small display. Unlike trains and buses, this study aims to select a space inside a subway train that is difficult to transfer location information to and suggest an interface to reduce cognitive differences to users. First, observe the actual environment and then derive the empirical factors. Second, by using Metapo which is an act of understanding or experiencing specific targets that are not familiar with familiar objects, the interface is designed according to the UX principle after converting the experience element into metapo. Finally, usability will be assessed through user experience evaluation and problem elicited and supplemented in future studies. This study expects the use of spatial interfaces to be increased and applied as a variety of services by using metaphors through experience elements to help users easily recognize their location within the mobile interface.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.18 no.5
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• pp.49-63
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• 2019

Crowdedness management at subway platforms is essential to improve services, including the prevention of train delays and ensuring passenger safety. Establishing effective crowdedness mitigation measures for platforms requires accurate estimation of the congestion level. There are temporal and spatial constraints since crowdedness on subway platforms is assessed at certain locations every 1-2 years by hand counting. However, smart cards generate real-time big data 24 hours a day and could be used in estimating congestion. This study proposes a model based on data from transit cards to estimate crowdedness dynamically. Crowdedness was defined as demand, which can be translated into passengers dynamically moving along a subway network. The trajectory of an individual passenger can be identified through this model. Passenger flow that concentrates or disperses at a platform is also calculated every minute. Lastly, the platform congestion level is estimated based on effective waiting areas for each platform structure.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.4
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• pp.464-469
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• 2019

Tapered roller bearings are used widely in vans, trucks, and trains because they can support the vehicle in a stable manner even under a heavy load. The cage of a tapered roller bearing maintains the gap between the rollers, which prevents friction wear and suppresses heating. If the cage is severely deformed due to resonance, the roller may not be able to roll smoothly and even leave the cage. Consequently, it is very important to analyze the dynamic characteristics of the cage for reliable performance of a bearing. The cage essentially has geometrical tolerance in the manufacturing process. In this paper, the effects of those geometrical imperfections on the dynamic characteristics of the cage were investigated. As a result, natural frequency separation occurred near the natural frequency of the ideal cage due to geometrical imperfections. In addition, the interval was proportional to the magnitude of the geometric error, and the interval increased with increasing mode number.

• Journal of the Korean Geotechnical Society
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• v.23 no.6
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• pp.115-126
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• 2007

The tilting-train is very attractive to the railroad users in the world because it runs with high speed in curved track using pre-existing infrastructure. The tilting-train has a unique allowable speed and mechanism expecially in curved track. Therefore, it should be evaluated in terms of the stability of the train operation and roadbed. In this study, when the tilting-train is being operated with the allowable speed, the behavior of the roadbed is evaluated by examining the settlement and bearing capacity of the roadbed. Additionally, the stability of the roadbed is estimated in the condition of soft roadbed influenced by the weather effects and cyclic train loading. The numerical results show that the roadbed settlements satisfy the allowable settlement when Young's moduli of the upper roadbed and in-situ soil are more than $2,300t/m^2\;and\;3,300t/m^2$, respectively, in the continuous welded rail (CWR) and $3,800t/m^2\;and\;4,600t/m^2$, respectively, in the rail joint.