• Title/Summary/Keyword: 경부선

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Prediction Method and Characteristics of Micro-pressure Wave on High-speed Railway Tunnel (고속선 터널미기압파 특성 및 예측기법 연구)

  • Yun, Su-Hwan;Nam, Seong-Won;Kim, Seok-Won
    • Journal of the Korean Society for Railway
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    • v.18 no.1
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    • pp.8-14
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    • 2015
  • This paper describes a prediction method for micro-pressure wave emitted from a tunnel on the Kyung-bu high-speed railway. Pressure and micro-pressure wave were measured simultaneously to obtain some constants for the prediction method. The change of a micro-pressure wave were analyzed according to the speed of the train, the track bed type, and the distance from a tunnel portal. At a train speed of 300km/h, the micro-pressure wave of 4.0km long ballast track tunnel is about 7.5Pa; that of 3.3km long slab track tunnel is about 14.3Pa The strength of the micro-pressure wave decreases in inverse proportion to the distance and becomes about 0.5~1.0Pa at a point of 100m from the tunnel exit. Micro-pressure waves were predicted using the formula with the obtained the constants. Using a comparison between the predicted data and field measurement data, it was confirmed that micro-pressure wave can be predicted easily through the prediction formula.

The study on the operation of fire fighting vehicle for a long railway tunnel (장대터널용 소방차량의 운용에 관한 연구)

  • Kwon, Tae-Soon;Park, Won-Hee
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.5
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    • pp.516-521
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    • 2016
  • In this study, we investigated the operation of railroad fire fighting vehicles against fires on trains in a long railway tunnel. In recent years, long railway tunnels (more than 10 km in length) have been built and the number of such tunnels, such as the Geumjeong tunnel (20.3 km in length) on the Gyeongbu high speed line, Solan tunnel (16.7 km in length) on the Yeongdong line and Yulhyeon tunnel (50.3 km in length) on the Suseo high speed line which is scheduled to be opened in the second half of 2016, is increasing. Significant damage is to be expected, due to the increased evacuation time and limited accessibility of fire services when the train is stopped by an urgent fire in the tunnel. Special fire fighting vehicles capable of running on rails have been developed and operated in overseas advanced countries. Therefore, a fire-response system using Unimog vehicles, which can run on road and rail, instead of road vehicles, is necessary. The characteristics of the railway tunnel and thermal environmental change caused by a train fire in a tunnel were analyzed in this study. Also, the operational requirements of the railroad fire fighting vehicles were evaluated by taking into account the specifications of the railroad fire fighting vehicles under development.

A Case of Basal Cell Adenocarcinoma with Neck Metastasis in the Parotid Gland (경부전이를 동반하여 이하선에 발생한 기저세포선암 1예)

  • Park, Jae Hong;Kim, Won Shik;Byeon, Hyung Kwon;Hong, Hyun Jun;Jung, Hae Yoen;Ban, Myung Jin
    • Korean Journal of Head & Neck Oncology
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    • v.31 no.1
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    • pp.39-42
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    • 2015
  • Basal cell adenocarcinoma is a extremely rare low grade malignancy of the salivary gland. It is composed of basaloid cells with dark cell, light cells and pale cytoplasm which shows infiltrative growth pattern into adjacent glandular parenchyme. The pathophysiology of basal cell adenocarcinoma is not well known. First hypothesis is a malignant transformation of the monomorphic adenoma and second one is a de novo origin. Metastasis to the regional lymph nodes is rare. Recently, we have experienced a case of basal cell adenocarcinoma with neck metastasis after previous superficial parotidectomy. For this reason we report this rare case discussed with references.

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Utilizing Technology in Measurement System for Catenary Current: - Focusing on Testing Results for Kyoungbu High-speed Line in Korea - (조가선 전류 검측 시스템의 활용기술 연구 - 고속선 경부2단계 시험결과를 중심으로 -)

  • Park, Young;Jung, Hosung;Lee, Kiwon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.10
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    • pp.1465-1469
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    • 2013
  • The resent developed high speed train called HEMU-430X (Highspeed Electric Multiple Unit - 430km/h eXperiment) recorded a 421.4 km/h in Kyoungbu high speed line in Korea. A verity of measurement systems are used to check the performance between pantograph and catenary system. An innovative measurement system is adopted to check the current of catenary wire in the track side during HEMU-430X test running. This paper presents the measurement results of catenary current in kyoungbu high-speed line and describe its utilizing technology in the experimental results of catenary current. In order to analyze field testing results, the current ratio between contact and catenary current have been analyzed by means of Carson-Pollaczek equation. And the current wave forms between catenary and contact wire are presented based on the simulation results.

The Study for Tilting Train Adaptation of ATP Onboard System (ATP 차상장치의 틸팅열차 적용에 대한 연구)

  • Baek, Jong-Hyen;Kim, Yong-Kyu;Shin, Duck-Ho;Lee, Kang-Mi
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1012-1013
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    • 2008
  • 경부고속철도의 개통과 함께 서울-부산 간 운행시간이 새마을호 기준 4시간 30분에서 2시간으로 단축되는 등 획기적인 시간 절감을 이루었으나 이는 고속철도가 운행되는 지역에 국한된 것이다. 이에 고속철도 비 수혜지역의 운행시간 단축을 위해 기존선 속도향상이 요구되며, 이러한 목적으로 한국철도기술연구원에서는 틸팅열차를 개발하여 시운전 10만Km를 목표로 시험운행중이다. 또한 한국철도공사에서는 이와 유사한 목적으로 기존선 신호시스템인 ATS 시스템을 차상신호시스템(ATP)으로 개량하는 사업이 추진되고 있다. 현재 틸팅열차에는 기존의 ATS(자동열차정지장치) 차상장치만을 장착하여 차량의 성능 확인을 위한 시험 및 시운전을 우선적으로 추진하고 있는 상태이며 이러한 ATS 차상장치는 160km/h 이하의 속도에서만 본연의 기능이 유지되고, 그 이상의 속도에서는 현실적으로 사용이 어렵기 때문에 틸팅열차의 목표속도인 200km/h에서 적합하게 시험하기 위해서는 적합하지 않다. 따라서 한국철도공사에서 추진하고 있는 ATP 구축사업의 지상설비와 연계될 수 있는 ATP 차상장치를 설치하여 시험을 하여야 한다. 본 논문에서는 이를 위하여 ATP 차상장치의 틸팅열차 적용에 대한 연구를 추진한 결과를 발표하고자 한다.

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Analysis on the induction effects by electricity feeder station of the electromagnetic induction from high-speed railway system (고속전철 전자유도에 대한 급전소 유도 효과 실측연구)

  • Han, Man-Dae;Choi, Mun-hwan;Lee, Sang-mu;Cho, Pyoung-Dong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2009.10a
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    • pp.843-846
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    • 2009
  • 경부고속전철의 급전선에 의한 전력유도 대책을 위하여 건설 당시 정보통신부 고시에 의하여 시행되었다. 통신선에 장애를 유발할 수 있는 전자유도 대책을 위해서는 국가 기술기준에 의한 유도전압 한계치가 정해져 있고 현장 대책 상 이 제한치를 초과할 때에 필요한 것이므로 상기 정부 고시의 기술 근거에 의해 유도전압을 계산하여 조치하고 있다. 전기철도시스템에서 지역 구간상의 전력 공급을 위한 일정 거리마다 급전소가 시설되어 있어서 이로부터 전철에 전력이 공급되고 있다. 전철의 유도현상에 의한 유도전압 분포 분석을 위한 전국 구간 유도측정을 수행하여 급전구간에서의 유도전압 특성을 파악하였다. 구간 중심점상에서 낮아지는 전압에 대해 급전소 근접 구간에 이르렀을 때의 전압 상승 특성을 분석하였다. 급전소로부터 귀로되는 전류의 양이 집합됨으로 유도전압이 높아지고 거리가 멀어질수록 전압은 떨어진다. 유도대책을 전압 분석에 있어서와 차폐시설물의 연계 활용 시 이러한 전압의 영향성을 고려할 필요가 있다.

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EARLY HISTO(PATHO)LOGIC CHANGES AND RECOVERY OF TOOTH AND PERIODONTAL TISSUE IN INTRUSION OF PREMOLAR ON YOUNG ADULT DOGS (유성견의 소구치 압하시 초기 치아 및 치주 조직의 조직학적 변화와 재생에 관한 연구)

  • Ahn, Byeong-Kyo;Cha, Kyung-Suk;Lee, Jin-Woo
    • The korean journal of orthodontics
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    • v.28 no.2 s.67
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    • pp.297-310
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    • 1998
  • The purpose of this study was to investigate the initial tissue change, to repair on the teeth & surrounding tissue under the intrusive orthodontic forces by use of elastic chain, through the microscopic findings. For this study, three young adult mongrel dogs were used, and were divied into three group : the control group was deliveried only casting crown and the experimental group 1 was equipped with energy chain during 1 week and experimental 2 group was deliveried using energy chain during 1 week and 3 weeks observation. All experimental groups and control groups were sacrificed to make the samples for microscopic findings on premolar teeth. All samples were examed and compared the histologic changes through the microscopic with H-E stain. The obtained results were as follows. 1. In hematoxylin-eosin stain of the control group, the periodontal ligament was constant width from apical third to cervical third of the root, and the periodontal fiber arrangement was horizontal or oblique in cervical third, oblique in middle and apical third of the root. 2. In Masson Trichrome stain of the control group, osteoblast and osteoclast appeared in cervical third of root, and bone resorption and new bone formation was observed in middle and apical third of the root. 3. In experimental 1, osteoclasts were increased highly, and hyperemia of blood vessels and new bone formation and bone resorption by reversal line in apical third of the root were seen. PDL width was increased apprarently from crest to apex of the root and more in apical third. 4. In experimental 2, osteoclasts and hyperemia of blood vessels were more increased than control material in apical third of the root. PDL width was increased more than control group in root apex, and was seen less than experimental 1. PDL arrangement was similar to experimental 1 and was mixed only in root apex. Therefore, in premolar intrusion of the young adult dog, there were increased osteoclast, hyperemia and dilation of blood vessel, resorption of alveolar bone and cementum and different arrangement of PDL in initial tissue change. There was not observed complete repair after remove intrusive force.

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Direct Closure of Post-Incubation Tracheoesophageal Fistulas, -Report of 3 Cases- (기관내 삽관 후 발생한 기관식도루의 직접 봉합에 의한 수술적 치료 -3례 보고-)

  • Gang, Jong-Ryeol;Lee, Hong-Seop;Kim, Chang-Ho
    • Journal of Chest Surgery
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    • v.29 no.9
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    • pp.1045-1049
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    • 1996
  • Post-intubation tracheoesophageal fistula is rare, and its management causes a serious problems to surgeons. We have experienced 4 cases in 3 patients. Simple ditcision and closure of the fistulas were done by trans-cervical approach after weaning of ventilator. The tracheal defect was closed by simple suture, and the esophageal defect was closed in two layers before a viable muscle flap was interposed between the two suture lines in order to prevent recurrence. There was one delayed tracheal stenosls and one recurrent fistula, and these complications were also managed success ully.

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종합건설업체 탐방 ⑤-쌍용건설(주)

  • Korea Mechanical Construction Contractors Association
    • 월간 기계설비
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    • no.9 s.194
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    • pp.64-70
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    • 2006
  • 세계 100대 건설사 중 하나인 쌍용건설(주)는 1977년 창립 이래 오늘날 까지 꾸준한 성장을 보이고 있다. 해외건설 시장이 중동에 편중되었던 80년대에는 싱가포르, 말레이시아, 미국, 일본 등 해외시장 개척의 첨병 역할을 톡톡히 했으며, 인천국제공항, 경부고속철도, 경의선 등의 대규모 국책사업을 성공적으로 수행했고 더불어 고속도로, 항만, 플랜트 등을 시공하여 국가 산업 발전에도 기여하였다. 2005년 1조 1천600억 원대의 매출액과 300억 원대의 경상이익, 1조 9천억 원대의 수주를 달성하는 성과를 올린 쌍용건설(주)는 2006년의 경영 목표를 턴키 및 SOC민자사업 확대/ 지방 및 수도권 신도시 위주의 주택사업 전개/ 동남아 국가 사회기반시설공사 적극 참여 및 고급 건축분야 수주 확대 등으로 삼아 이를 이루고자 전력을 다하고 있으며, 이런 노력의 결과로 지난 7월, 인도네시아에서 미화 1억 3천만 달러 규모의 '플라자 인도네시아 확장공사'를 수주하여 건설업계의 화제가 되기도 했다.

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A Case of Parotid Actinomycosis Mimicking Parotid Gland Tumor (이하선 종양으로 오인된 방선균증 1예)

  • Kwon, Seong-Keun;Chi, Jun-Hyuk
    • Korean Journal of Head & Neck Oncology
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    • v.26 no.2
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    • pp.225-227
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    • 2010
  • Actinomycosis is an unusual granulomatous infection caused by gram-positive anaerobic bacteria called Actinomyces species(predominantly Actinomyces israelii), which is a common and normally nonpathogenic organism found in the nose and throat. The three major clinical presentations of actinomycosis include the cervico-facial(the most common, 55%), thoracic, and abdominopelvic region. Actinomycosis typically has a chronic, indolent course characterized by swelling and induration of the soft tissues and eventual spontaneous drainage through multiple sinus tracts. Actinomycosis is difficult to diagnose because of variable presentation mimicking neoplasm and fastidious nature of the organism in culture. We present a case of actinomycosis in the parotid tip area which was mistaken for a salivary tumor.