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시뮬레이션을 통한 K-AGT 대차 성능 향상을 위한 동특성 연구
장율(Yul Jang),이호용(HoYung Lee),이안호(AnHo Lee),조홍식(HongShik Cho),서명원(MyungWon Suh) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
K-AGT Bogie has a rubber wheels and side guide. Side guide type has a many merits but occur a vibration and friction through contact between guide rail and guide wheel. Present max speed of operation is 60㎞/h. We start study for improved a max speed of operation to 70㎞/h. Most of point that decreased comport is vibration through the guide contact. So we make the improved guide part of two types (Spring and Rubber Type). In this study, we modeling with CATIA and conducted a dynamic analysis with ADAMS. Finally, we optimized guide rail spring with simulation using the ADAMS.
한국 표준형 무인자동운전 고무차륜 경량전철 시스템 신뢰성 평가
장율(Yul Jang),이호용(Hoyong Lee),서명원(MyungWon Suh) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Reliability is defined to be the probability that a component or system will perform a required function for a given period of time when used under stated operating conditions. It is the probability of a nonfailure over time. Korea Railroad Research Institute developed the Driverless Rubber Tired Korea-AGT from 1994 to 2004. K-AGT System is Driverless and complex system to be consist of many components. Therefore, it is necessary to perform a Reliability estimation. So, we have performed reliability estimation from 2005 in the test line. In this paper, Divided a Reliability estimation period in two parts and compared MKBF of Part 1(from 2005 to 2007) with MKBF of Part 2(in 2008). Finally, The MKBF of K-AGT System has been improved through the failure analysis and redesign
장성찬(Jang Sung-Chan),유보선(Yoo Bo-Sun),이정율(Lee Joung-Yul) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.5
In this paper, the urban environment and suitable for low-floor tram safety and convenience, traffic caring for weak, the shape and color of various devices, outdoor and indoor design, equipment lay out concidering the wish to be investigated.
임프란트 나사형태와 치조골 흡수에 따른 응력분산의 3차원 유한요소법적 분석
김일규,손충렬,장금수,조현영,백민규,박승훈,Kim, Il-Kyu,Son, Choong-Yul,Jang, Keum-Soo,Cho, Hyun-Young,Baek, Min-Kyu,Park, Sheung-Hoon 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.1
The objective of this study is to evaluate the stress distribution according to the thread design and the marginal bone loss of a single unit dental implant under the axial and offset-axial loading by three dimensional finite element analysis. The implants used had the diameter of 5mm and 4mm with 13mm in length and prosthesis with a conical type which is 6mm in height and 12mm in diameter. The thread designs were triangular, square and buttress. In the three dimensional finite element model with $15\times15\times20mm$ hexahedron and 2mm cortical thickness, implants were placed with crown to root ratio 7:12, 10:9, 13:6 and 16:3. And additionally the axial force of 100N were applied into 0mm, 2mm and 4mm away from the center of the implants. The results were as follows 1. The maximum von-Mises stress in cortical bone was concentrated to cervical area of implant, and in cancellous bone, apical portion. 2. Comparing the von-Mises stresses in cortical bone of 2mm and 4mm offset loading with central axial loading, it were increased to 3 and 5 times in diameter 4mm implant, and 2 and 4 times, in diameter 5mm implant. 3. The square threads were more effective than the triangular and butress as the longer diameter, the offset loading, and the worse crown to root ratio. 4. The von-Mises stresses were relatively stable until crown to root ratio 13:6, but it was suddenly increased at 16:3. From the results of this study, minimum requirement of crown to root ratio of implant is 2:1, and in the respect of crown to root ratio, diameter and offset loading, square threads are more effective than triangular and buttress threads.
경량전철 선로구조물의 예방정비를 위한 모니터링시스템 연구
이호용(Hoyong Lee),장율(Yul Jang),류상환(Sanghwan Ryu),이안호(Anho Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The size of a vibration acceleration does not have direct influence on structural safety of the track & infrastructure, but the problem of the back of the fatigue damage can happen in the long run if the acceleration happens greatly. We have an influence on the ride-comfort with the going safety of the vehicle. In the case of vibration acceleration, because it is no direct comparison standard, absolute comparison is difficult. This research can take advantage of long term to measuring anger of the track & infrastructure state and metrical data of present state at individuation measurement point through monitoring ordinary times. In this research is monitoring system of Web-Based information system of use for the track & infrastructure maintenance. Safety of construction can analyze special quality of track & infrastructure through basis data construction for relation analysis between part damage and vibration delivery special quality by fatigue breaking. These data and monitering system may be used usefully maintenance.
Streptomyces thermocarboxydus C12에서 Subtilisin-like Protease Inhibitor 생산을 위한 최적배양조건
강성일(Sung-Il Kang),장영부(Young-Boo Jang),최경임(Gyeonglim Choi),최병대(Byeong-Dae Choi),공재열(Jai-Yul Kong),최영준(Yeung-Joon Choi) 한국식품영양과학회 2008 한국식품영양과학회지 Vol.37 No.3
광양만의 해안 뻘에서 protease 저해력이 우수한 균주 S. thermocarboxydus C12를 분리하여 최적의 저해제 생산 조건을 조사하였다. 최대 저해활성을 보이는 온도와 초기 pH는 각각 40℃와 8.0이었다. 저해제 생산에 미치는 탄소원의 영향을 검토한 결과, 단당류인 galactose, glucose, fructose와 다당류인 starch에서 높은 저해활성을 보였으며, 최적의 탄소원과 농도는 각각 galactose와 1.6%(w/v)였다. 질소원의 경우 복합배지인 polypeptone과 proteose peptone에서 가장 높은 저해활성이 나타났으며, 최적의 농도와 질소원은 0.5%(w/v)와 proteose peptone이었다. 최적의 NaCl 농도와 금속이온은 각각 1%(w/v)와 1 mM LiCl이었다. 선정된 최적배양조건에서 균주를 배양한 결과, 84시간 동안 배양 시저해활성이 최대인 것으로 나타났다. The objective of this paper was to investigate optimal culture conditions for the production of an inhibitor against subtilisin-like protease from Streptomyces thermocarboxydus (S. thermocarboxydus) C12 isolated from sediments of Gwangyang coast. The optimal temperature and initial pH for the production of subtilisin-like protease inhibitor were 40℃ and pH 8.0, respectively. Inhibition activities were high for galactose, glucose and fructose. The best carbon source and its concentration were galactose and 1.6% (w/v), respectively. Inhibition activities were also high in medium containing polypeptone, proteose and peptone. Optimal nitrogen source and concentration were protease peptone and 0.5% (w/v), respectively. Optimal concentrations for inhibitor production were 1% (w/v) for NaCl and 1 mM LiCl for metal salts. The subtilisin-like protease inhibitor from S. thermocarboxydus C12 showed a maximum inhibitor activity after cultivation for 84 h under the optimized medium.
황경민 ( Hwang Kyeong-min ),장정범 ( Jang Jung-bum ),김경열 ( Kim Kyoung-yul ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
As the law for measurers against earthquake disasters take effect on recently, seismic countermeasures for public facilities become the center of main interest. Especially, operating transformers in the substations are so important equipment that play a pivotal role in supplying electric power, and their seismic design is essential. When seismic design for the transformers is conducted, it is considered that the various factors affecting their anchorage such as diameter of an anchor bolt, space between anchor bolts, distance from concrete edge to an anchor bolt, etc. So, the greatest concern of designers how to reinforce these optimally by considering simultaneously seismic safety and construction. Thus in this study, the factors affecting seismic design of anchorage for 154kV main transformers were analyzed using 6-sigma statistical technique and then an optimal design plan was decided.
황경민(Hwang, Kyeong-Min),장정범(Jang, Jung-Bum),김경열(Kim Kyoung-Yul) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
As the law for measurers against earthquake disasters take effect on recently, seismic countermeasures for public facilities become the center of main interest. Especially, operating transformers in the substations are so important equipment that play a pivotal role in supplying electric power, and their seismic design is essential. When seismic design for the transformers is conducted, it is considered that the various factors affecting their anchorage such as diameter of an anchor bolt, space between anchor bolts, distance from concrete edge to an anchor bolt, etc. So, the greatest concern of designers how to reinforce these optimally by considering simultaneously seismic safety and construction. Thus in this study, the factors affecting seismic design of anchorage for 154kV main transformers were analyzed using 6-sigma statistical technique and then an optimal design plan was decided.
이호용(HoYung Lee),장율(Yul Jang),류상환(Sang-hwan Ryu),조홍식(HongShik Cho),서명원(MyungWon Suh) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
K-AGT Bogie is a rail car with rubber wheels while common rail Bogie has a iron wheel, and side guide type. so K-AGT has more contact between side guide rail and guide wheel than common rail. It is generated by vibration and friction through the contact. In this study, we make the improvement guide of two types (Spring and Rubber Type) and test. Test was performed with 3 Types of Original, Spring and rubber type and at a speed of 5 steps (30㎞, 50㎞, 60㎞, 70㎞, 80㎞). Sensor was attached to the guide, front part and rear part. In the result, RMS. value was reduced about 12% and natural frequency of car body about 20㎐ did.