• Title/Summary/Keyword: UIC

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Analysis of the Acceleration Characteristics on the Conventional line for Korean High Speed Train- in il point of passing speed on the curve (한국형 고속전철의 기존선 주행 진동가속도 특성 분석 - 곡선 통과속도 중심으로)

  • 김영국;김석원;목진용;박찬경
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.05a
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    • pp.222-227
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    • 2004
  • Korean High Speed Train(KHST) has been tested on the high speed test line in Osung site, since it was developed through the G7 Project Plan in 2002. It was also tested on the conventional line such as KyongBu and Honan Line to know the possibility of increasing the limited speed for the high speed trains. This paper introduces the method to improve the speed on the conventional line with body lateral acceleration among the several considered issues and explains the parameters related to those analysis, such as the cant deficiency, the radius of curve, speed and etc. When a train pass on the curved track, the lateral accelerations of body are divided into the quasi-static and the maximum accelerations according to the UIC 518 which is the international specification for testing and approval of railway vehicles from the point of view of their dynamic behaviour, especially for safety and ride comfort. This paper shows that it is safe and comfort from the results of test when KHST runs on the conventional line with the curves and proposes that the limited speed of conventional curved line could be changed to a little higher speed if the analysises of other fields are completed.

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Fatigue Life Evaluation of Motor Block Bracket Units for KTX-Sancheon Trains (KTX-산천 열차용 모터 감속기 고정대의 피로 수명 평가)

  • Lee, Chan-Woo;Lee, Dong-Hyong
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.6
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    • pp.626-631
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    • 2012
  • In this study, fatigue life of the motor block bracket units for KTX-Sancheon trains was assessed. Design evaluation for railway structures was performed based on the UIC 566 regulation, and test and evaluation of fatigue life in welded parts was performed in accordance with standard ERRI B 12/RP17 and ERRI B 12/RP60. The actual vehicle dynamic stress testing was executed in KTX-Sancheon service line with the service operating speed. The dynamic stress was measured with commercial data acquisition system (MGC plus). The cumulative damage was evaluated by applying standard BS 7608 - Class F and cycle counting was used rain-flow counting method. As a result, the motor block bracket units for KTX-Sancheon trains was designed to fit the regulation and the safety of fatigue life for 30 years, assuming that KTX-Sancheon trains travels 600,000km annually, were confirmed under current operating conditions.

Examination on the variation of ride comfort for korean high speed train through on-line test (시운전 시험을 통한 한국형 고속열차의 승차감 변화추세에 관한 연구)

  • Kim, Young-Guk;Mok, Jin-Yong;Kim, Seog-Won;Park, Chan-Kyeong;Kim, Ki-Hwan;Park, Tae-Won
    • Journal of Sensor Science and Technology
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    • v.14 no.3
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    • pp.144-149
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    • 2005
  • In this paper, we introduce the variation of ride characteristics for HSR 350x(Korea High Speed Train project) through on-line test during about 3 years. The concept of term "ride comfort" is equivocal. Generally it is evaluated as the vehicle vibration. The ride comfort for HSR 350x has been assessed by statistical method according to UIC 513R. The testing results show that HSR 350x has no problems from the viewpoint of the comfort ride on the high speed line and conventional line and that 1st and 2nd suspensions play an important role in the ride characteristics for high speed train.

The Parameter Study on the Characteristics of Axial Force in Turnout with Continuous Welded Rail (분기부(分岐部) 장대(長大)레일화시의 축력거동특성(軸力擧動特性) 해석(解析))

  • Kim, Doo-Hwan;Ko, Sang-Hun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.5 no.2
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    • pp.163-174
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    • 2001
  • This paper is to study the characteristics of axial force behavior that operates to the part of turnout when it makes the turnout and the continuous welded rail unifying. The study is to model by using the 50kgN rail No. 15 turnout used in the domestic national railway and the UIC60 rail No. 18 turnout used in the rapid transit railway as the finite elements for analyzing the axial force behavior of the turnout by the continuous welded rail. It is to analyze the characteristics of behavior according to the change of creep resistance, ballast resistance and the change of parameter valuables of heel joint by the axial force simulation in making the continuous welded rail and then, it is to present the result. As the result of research on the parameter valuables through the analysis, it shows that the maximum axial force of turnout by the continuous welded rail are largely subordinated to the maximum resistance of heel joint and the fitting devices than the ballast resistance. Also it shows that the maximum axial force produced changes a lot according to the characteristics of creep resistance of the fitting part and the ballast resistance.

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A Study on the Effects of Construction Tolerances on the Current Collection Performance for High Speed Catenary System (고속전차선로의 시공 허용오차가 집전성능에 미치는 영향에 관한 연구)

  • Kim, Tae-Hun;Seo, Ki-Bum;Park, Jae-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.12
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    • pp.1782-1788
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    • 2015
  • In this paper, analysis of the effects for construction tolerances on the current collection performance of high speed catenary system. The height of the contact wire is the geometrical position of the cantilever directly affects the current collection performance. Contact force when the height of the contact wire exceeds the construction tolerance were analyzed. As a result, the maximum contact force was analyzed to more than 350[N] that are recommended by EN50119. And when the geometrical position of the cantilever to exceeds the construction tolerance, the analysis results of uplift at the mast support points, it becomes 127[mm] that are recommended by UIC 799. If the construction tolerances exceeds the reference value, the current collection performance is deteriorated. Therefore, catenary system require high precision construction. In the future, there is a need for continuing research on the tolerance of catenary system in the actual operating state.

Fatigue Strength Evaluation of Bogie Frame of Urban Maglev Train (도시형 자기부상열차 대차 프레임의 피로강도 평가)

  • Han, Jeong Woo;Kim, Heung Sub;Bang, Je Sung;Song, See Yeob
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.7
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    • pp.945-951
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    • 2013
  • This study evaluated the fatigue strength of the bogie frame of an urban maglev train through fatigue analysis, cumulative damage, and fatigue tests based on a proposed fatigue evaluation method. The results of FEM analysis in which various load combinations were adopted showed that all data were under the fatigue limit of a butt welded joint made of A6005 in a Goodman diagram. The cumulative fatigue damage was calculated at the highest level from a bolt connecting the area of the electromagnetic pole in the casting block; however, the total sum was evaluated as D=0.808 based on $1{\times}10^7$ cycles, which indicates that it did not exceed the failure criteria. In addition, the results of the fatigue testshowed that there was no crack at any position in the bogie frame, which corresponded to the results of fatigue analyses.

마우스 수정란의 발생단계별 telomeric DNA의 분포양상과 telomerase activity 분석

  • 강민영;한명숙;조은정;이재화;손시환
    • Proceedings of the Korean Society of Developmental Biology Conference
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    • 2003.10a
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    • pp.112-112
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    • 2003
  • Telomere란 진핵세포에 존재하는 DNA-protein 복합체로서 염색체의 말단부에 tandem repeated DNA 서열 (TTAGGG)과 특정 단백질로 구성되어 있으며 세포 분열이 진행함에 따라 이의 길이가 짧아지게 되고 일정 길이 이하가 되면 세포의 사망이 유발된다. 반면 telomerase는 ribonucleoprotein으로서 telomeric DNA의 합성에 관여하는 것으로 염색체의 말단에 telomeric DNA의 소실을 보충하는 역할로 알려져 있다. 최근 암, 노화 등과 관련하여 telomere 및 telomerase의 연구들이 활발히 진행되고 있으며, 다양한 세포들에 있어 이들의 존재와 역할에 대해서도 많은 연구들이 수행되고 있다. 포유동물의 초기 배자에 있어 telomere의 분포 양상과 telomerase의 activity의 분석은 배 발생의 기작과 배자의 세포적 특성을 구명하는데 매우 중요한 과제라 사료된다. 따라서 본 연구에서는 마우스의 초기 배 발생 단계별 수정란의 telomeric DNA의 분포 양상과 각 단계별 배자들의 telomerase activity를 제시하고자 하였다. 시험에 공시된 마우스는 4-6주령된 ICR계통으로 이들을 과배란 처리 후 자연 교배시켜 얻은 2-, 4-, 8-세포기배, 상실배 및 배반포배를 대상으로 하였다. Telomeric DNA의 양적 분석은 각 발생단계별 수정란의 표본을 제작하고 human telomere repeat probe를 이용하여 FISH (fluorescence in situ hybridization)를 시행하였으며, 분리된 할구들을 형광현미경으로 관찰 후 상을 포착하고 image analyser program (MataMorph, UIC, USA)을 이용하여 한 개의 세포내 telomere의 상대적 함량을 분석하였다. 발생 단계별 배자의 telomerase activity의 분석은 TRAP (telomeric repeat amplofication protocol) assay로 분석한 바 각 발생 단계별 30개의 수정란으로부터 핵 단백질을 추출하여 telomerase를 신장시키고 PCR을 시행한 후 15% PAGE gel loading하여 이의 activity를 확인하였다. 분석 결과, telomeric DNA의 함유율은 발생단계별 다소의 차이를 나타내었으며 telomerase activity는 모든 발생단계의 수정란에서 확인할 수 있었고, 특히 상실배부터 높게 나타남을 확인하였다.

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Effects of the interplay between organizational and national cultures in an international university-industry collaboration for technology innovation and transfer (기술혁신과 기술이전을 위한 국제산학협력에서 조직문화와 국가문화 간의 상호작용 효과)

  • Hwang, Kum-Ju
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.9
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    • pp.3259-3270
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    • 2010
  • The purpose of the study was to understand how the interplay between organizational and national cultures affects the management of IUICs (International University-Industry Collaboration) devoted to technology innovation and transfer. This study presents two examples of IUIC drawn from a qualitative research method, both involving a British university and a Japanese company. The first case illustrates how different organizational practices (organizational culture), which are nested in the national culture (values), raise questions about the role of ethical boundaries in causing misunderstandings and the deterioration of UIC relationships. The second case demonstrates how long-term relationships and extensive interpersonal interactions can play a positive role in IUIC. Practical implications, the limitation of this study and further studies have been discussed.

Comparative Study of Foreign Countries on Management Rules on Rail Defects (각국의 레일결함 관리 기준 비교)

  • Yun, Kyung Min;Song, Myeong Gyu;Lee, Chin Ok;Lim, Nam Hyoung
    • 한국방재학회:학술대회논문집
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    • 2011.02a
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    • pp.184-184
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    • 2011
  • 선로의 레일은 재료적인 특성과 현장의 많은 주변 요소에 의한 불확실성이 매우 높은 시스템으로 결함의 위험이 상존한다. 결함 발생과 조치에 따라 영업손실로 이어지므로 레일 결함 발생과 동시에 적절한 조치가 요구된다. 따라서 레일결함 발생 시 레일교환시기를 파악하는 것이 선로관리비용을 줄일 수 있으며 레일교환에 대한 신속한 판단을 위함 관리기준을 정립하는 것이 요구된다. 현재 국내에서 고속선의 경우 관리 기준이 있으나, 일반철도는 없는 실정이다. 본 연구는 차후 일반철도 180km/h 속도상승을 계획하고 있는 현 시점에 국외 관리기준을 분석하여 결함관리기준을 정립에 기여하고자 한다. 국내의 경우, 2004. 4. 1 프랑스 기술을 전수받아 개통한 고속선은 프랑스 레일관리기준을 적용한 "레일손상 등급별 관리기준"을 제정하여 레일관리를 시행하고 있다. 국외의 경우, INNOTRACK프로젝트 안에서 관련된 다른 IM(Infrastructure Managers, 사회기반시설 관리자들)에게 최근의 활동과 변화의 이해를 제공하기 위해서, 선택된 결함들의 최소조치들의 조사가 Network Rail, OBB, Prorail, Banverket 그리고 DB에서 수행되고 있으며 UIC 지침에도 포함되고 있다. 모든 최소조치 원칙은 초음파나 육안에 의해 발견된 길이나 초음파 또는 와류탐상기(eddy current system)를 이용한 깊이에 대한 제한(limits)을 준다. 또한 침목과 이음매 또는 용접부에 관한 위치에 관한 결함의 제한이 있다. 명시된 기간은 즉각적일 수도 있으며, 보통 속도 제한이나 비상 죔쇠(Clamps)같은 경감시키는 수단에 적용될 수 있으며, 또는 더 긴 기간이 될 수도 있다. 더 긴 기간들은 수리나 레일 교체를 통하여 선로로부터 결함이 제거되어야 하는 최대의 시간이다. 본 연구에서는 Transverse Breaks, Squats, Head Checks 3가지 결함 유형에 대해 각 국에서 사용하는 최소 조치를 비교하여 분석하였다. 분석결과, 유럽에서는 레일결함에 대하여 깊이 있는 연구를 통하여 관리기준을 정하여 관리하고 있으며 이에 따라 상세하고 구체적인 레일 관리가 가능하므로 효율적이며 안전성이 제고되는 것으로 판단된다. 차후 일반철도의 180km/h 속도상승을 계획하고 있는 현 시점에서 국내철도 일반선 여건에 적합한 레일결함관리기준을 정립하기 위한 추가적인 연구가 필요할 것으로 판단된다.

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Production and Properties of Tannase from Lenzites betulina (Lenzites betulina에 의한 Tannase 생산 및 성질에 관한 연구)

  • Hong, Jae-Sik;Kim, Myung-Kon;Kim, Keum-Jae;Kwak, In-Gu;Yoon, Sook
    • Microbiology and Biotechnology Letters
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    • v.18 no.6
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    • pp.591-598
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    • 1990
  • Six species under the basidiomycetes were screened for extracellular tannase (tannin acyl hydrolase EC 3.1. 1.20) production in submerged culture and Lenzites betulina was found to be most effective for the production of tannase. The optimum cultural conditions for tannase production were $25^{\circ}C$, pH 6.0 and 21 days of culture period, The efficient composition of culture medium for the production of tannase was performed in synthetic medium containing tannic acid, 2g; sucrose, 5g; bacto-peptone, 2g; ,$ KH_2PO_4, \;2g,\; MgSO_4.7H_2O \;0.5g,\; CuS0_4.5H_2O$, 2 mg; thiamine HCl, 100 ug and distilled water 100 ml, The tannase produced from Lenzites bdulin*r was 223.3 unit (umole of gaUic acidiml of brothlmin). The tannase had an optimal reaction conditions ofpH 6.0 and temperature of $40^{\circ}C$. The enzyme was stable at temperature below $40^{\circ}C$ and lost its activity by 50% above $60^{\circ}C$. And the stable pH range was 5.5 to 6.0.

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