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최시행(Si-Haeng Choi),고광남(Kwang-Nam Ko),정수영(Su-Young Chung),이희성(Hi Sung Lee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
As a result of the examination analyzed loop type of Detecting the Broken Rail Monitoring System as a part of prevention of train derailment, installed in the Seoul Metro No. 2 subway line 98.51m section which is Samsung to Seolleung, we found that it is possible to detect crack location(Thermit welding: 48.18m) within the margin of error of ±1m accurately As analysis of the first day, third day, fifty day, and seventh day periodically, we found that Fresnel reflection happened where the crack location 48.18m. However other 3 branches show loss by bending of optical cable(spread reflection from the outside impact)
최시행(Si-Haeng Choi),차관봉(Gwan-Bong Cha),이종성(Jong-Seong Lee),정수영(Su-Young Chung),이희성(Hi Sung Lee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
This study is examination of application on site for performance and stability of real-time broken rail detection equipment development system about connection welded part occurring data errors of broken rail monitoring system. As a result of analysis about data collected in Seoul Metro No.2 Subway from Mar. 2010 to Jan. 2011 we found it is possible to detect crack location(Thermit welding) within the margin of error of ± 1m accurately as the first attenuation was -1.2dB and the second was -1.3dB.
이석훈(Seok-Hoon Lee),이시행(Si-Haeng Lee),김정엽(Jung-Yup Kim) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.6
본 논문은 고령화되는 현대 사회에서 고령층 근로자들의 팔꿈치 근력 보조를 위한 웨어러블 로봇의 개발에 대해서 서술하였다. 기존에 연구 개발된 다양한 웨어러블 로봇들은 착용자가 사용하기에 가격, 휴대성 측면 뿐만 아니라 느린 착용자 의도 파악에 단점들이 있어왔다. 본 논문에서는 이러한 문제들을 최소화하기 위해 다음과 같은 특징을 강조하였다. 첫째, 양팔 작업 시 가장 많은 모멘트를 받는 팔꿈치 관절에만 구동기를 부착하여 무게와 부피 및 가격을 줄이고 실용성을 높였다. 둘째, 웨어러블 로봇의 작동을 추종 모드와 근력 증강 모드로 나누고, 본 연구에서 개발한 상박 근력 측정 장치로부터 착용자의 의지를 실시간 파악하여 모드가 자동적으로 전환 될 수 있도록 하였다. 이로부터 빠른 착용자 의도 파악과 동작 전환이 가능하도록 하였다. 개발된 로봇을 이용하여 무 부하 시 착용자의 모션 추종 성능을 측정하고, 부하 시 EMG (Electromyography) 센서로부터 상박의 근력을 측정함으로써 착용자의 근력 보조 성능을 실험적으로 입증하였다. 결과적으로, 초당 120 도의 모션 추종 성능과 60% 이상의 근력 보조 성능을 얻을 수 있었다. This paper describes the development of a wearable robot to assist the elbow muscle for use by elderly workers in aging societies. Various previously developed wearable robots have drawbacks in terms of their price, portability, and slow recognition of the wearer"s intention. In this paper, emphasis is placed on the following features to minimize these drawbacks. The first feature is that an actuator is attached only at the elbow joint that withstands the highest moment during arm motion to reduce the weight, volume, and price of the robot and increase its practicality. The second is that operation of the wearable robot is divided into two modes, a tracking mode and a muscle strengthening mode, and the robot can automatically switch between these modes by analyzing the wearer"s intention through the brachial muscle strength measuring device developed in this study. The assistive performance of the developed wearable robot is experimentally verified by motion tracking experiments without an external load and muscle strengthening experiments with an external load. During the muscle strengthening experiments, the power of the muscle of the upper arm is measured by a commercial electromyography (EMG) sensor. Motion tracking performance at a speed of 120°/s and muscle assistance of over 60 % were obtained using our robot.
이재봉(Jae-Bong Lee),정계용(Kye-Yong Jung),이해철(Hae-Cheol Lee),최시행(Si-Haeng Choi) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
LRT(Light Rail Transit) is currently adopting a more upgraded signal system these days. This latest signal system is a train on-board signal system with moving block based on the realtime bi-directional wireless communications. The system applies RF-CBTC(Radio Frequency - Communication Based Train Control System) in order thexecute fully automated manless operation. This paper reviews the performance requirements and safety of RF-CBTC that will be applied to the fully automated manless operation for LRT.
양회성(Yang Hoe-Sung),이상호(Lee Sang-Ho),최시행(Choi Si-Haeng),박용걸(Park Yong-Gul) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
With the development of IT industry and formation of web-based knowledge sharing platform, a variety of railway-related information services on the web have emerged, ranging from personal blogs to dedicated portal sites, as in the other sectors. These services are contributing to advancing railway industry after all. As far as it is concerned with specific areas such as railway sector, the internet users are hardly expected to avail satisfactory results in acquiring customized information from the access, as the information served varies on the intension of the web site operator or relevant agency, and indexing categories and sub-categories is not easy to work out in a straight manner. This study will review on the feasibility of standardizing categories and sub-categories for railway industry information on the web, and present optimum categorization and sub-categorization approach for the most satisfactory results when searched, ultimately aiming at laying a foundation to satisfy the wide spectrum of users' need for railway information.
파일 바이러스 복제 특성을 이용한 바이러스 탐지 및 복구
서용석(Yong-Seok Seo),이성욱(Seung-Uck Lee),홍만표(Man-Pyo Hong),조시행(Si-Haeng Cho) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅰ
본 논문에서는 컴퓨터 바이러스의 자기 복제 특성을 이용한 바이러스 탐지 및 복구 방안을 제안한다. 바이러스의 행동 패턴은 바이러스의 종류만큼 다양하지만 파일 바이러스의 경우, 자기 복제 행동 패턴은 대부분의 바이러스가 유사한다. 파일 바이러스가 시스템을 감염시키기 위해서는 기생할 실행파일을 열고, 자기 자신을 그 실행 파일에 복사해야 한다. 이와 같은 자기 복제 행위를 통해 바이러스가 광범위하게 전파될 때 그 피해도 커지게 된다. 바이러스의 자기 복제 특성을 감안하여 본 연구에서 제안하는 바이러스 탐지 알고리즘은 다음과 같은 특징을 가진다. 첫째, 바이러스의 자기 복제 행동 패턴을 파일 입출력 이벤트로 표현하여 바이러스의 행동 패턴으로 일반화시켰다. 둘째, 바이러스 1차 감염행위는 허용하고 2차 이후 감염 행위부터 탐지하고, 탐지되기 이전에 감염되었던 파일들을 복구한다. 이는 일반적인 바이러스들이 자기 복제를 지속적으로 수행한다는 점에 착안하여 false-positive 오류를 줄이기 위한 것이다. 본 고에서 제안하는 방법을 사용함으로써 특정 문자열에 의한 바이러스 탐지 및 특구 방법의 단점을 보안할 수 있을 것으로 기대된다.
중고전동차를 활용한 서울메트로의 베트남 하노이~하롱베이 철도사업에 관한 연구
손영진(Son Young-Jin),정수영(Chung Su-Young),최시행(Choi Si-Haeng),서덕용(Seo Deok-Yong),이상호(Lee Sang-Ho),오성효(Oh Sung-Hyo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Over the years, the Social Republic of Vietnam has demonstrated its high annual growth rate over 8%. In order to secure its sustainable economic growth, its has also demonstrated its sharp concerns on building up core infrastructures by luring foreign investments on a large scale, which would underpin the nation"s economic propulsion. Among others, transport infrastructures and networks centering on railway systems are obviously seen as the most urgent to be built to continue its growth. Seoul Metro recently took a significant step forward in Vietnam to launch railway business by executing its export project of 6 units of metro cars to Hanoi as on July 10, 2008. Those 6 cars are scheduled to be put on the tracks linking Yen Bian, Hanoi with Ha Long, for demonstrative running, around October, 2008, carrying tourists on that 163㎞s of the National Railway line serving the region. A successful running on the track will duly entail further export of additional 54 units of Seoul Metro cars to Vietnam. In this thesis, description will be noted on the reuse and economic value of the Seoul Metro"s de-commissioned metro cars, reflecting on the current urban railway law at home regulating the service life of rolling stocks domestically. This thesis will also study the points at issue, and the recommendable future orientation of the Vietnam railway business project.
손영진(Son young-jin),정수영(Chung su-young),이종성(Lee jong-seong),최시행(Choi si-haeng) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
With 34 years of accumulated operating experience, Seoul Metro has launched a project aimed at exporting second-hand trains(used EMU cars) to Vietnam while seeking measures for diversifying its business such as the construction of the metropolitan railways both at home and abroad, and operating business as a way of fiscal consolidation and management improvement. Therefore, Seoul Metro has moved ahead with this plan considering that there"s no legal constraints on durable period of rolling stocks in advanced countries where the vehicles have been used for 35 years or longer than 40 years through renovation such as safety inspection and comprehensive maintenance program, and the railway systems for the replacement are expected to reach 838 cars by 2015 with growth of 100 cars a year. Seoul Metro strives to create value for boosting revenues and recycling resources by sending used EMUs to Vietnam. Seoul Metro will also provide under-developed countries with cars at a low price as well as share the accumulated railway technical know-how so that it can promote the national image and obtain the pre-emptive effect of metro railways in Vietnam.