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정우진(W. J. Chung),나성훈(S. H. Na),함영삼(Y. S. Ham),문경호(K. H. Moon) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
The turnout system is typical railway facility to be in the way of conventional railway line"s speed - up. The KNR(Korean National Railroad) has a speed limit regulation(130㎞/h) for the passing the turnout to guarantee a safety. This research has been performed to confirm the propriety of this regulation by using experimental and analytical way before it was carried out. The reasonableness of the speed - limit regulation was judged base on the several experiments. It was proved that the regulation was not useless as it had been regarded and very important guide at least up to now.
정우진(W. J. Chung),신정렬(J. R. Shin),양신추(S. C. Yang),김남포(N. P. Kim) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
This study has been performed to develop the practical method to estimate the change of dynamic characteristics of rolling stocks passing on the high speed turnout system. Each part of turnout system are modeled in consideration of alignment, enter angle and amount of deflection and they are used to achieve dynamic analysis with a train model. Analysis results are compared with test results to confirm its validation.
정우진(W. J. Chung),오일근(I. G. O),허만선(M. S. Huh),김성원(S. Kim),서정희(J. H. Seo),조광수(K. S. Jo) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
The critical speed of a train running on the straight railway track is investigated by in-house program. The program is developed to find out nonlinear critical speed and it bases on the bifurcation theory. As a result, it is found that nonlinear critical speed exists on the lower speed band than linear critical speed and this fact imply a possibility of induction of a big accident.
오주선 ( Oh J. S. ),정우진 ( W. J. Chung ),박성운 ( S. U. Park ),박영준 ( Y. J. Park ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2017 강원 농업생명환경연구 Vol.29 No.3
Drivers of agricultural tractors are exposed to high levels of vibration for a long period of time because of the nature of their work. Thus, they have a high risk of musculoskeletal disorders such as fatigue accumulation, lumbar spine and neck pain. Various studies have been carried out to reduce ride vibration of agricultural tractors; however, because these studies mainly considered the driving. This study was conducted to evaluate ride vibrations experienced by tractor operators during plowing, rotovating, and transporting operations in Korea. Field data of ride vibrations were analyzed based on ISO 2631-1. The test was carried out at the Tongyangmoolsan R&D Center in Gongju, Chungcheongnam-do, at 3-20 km/h on the asphalt road and at 3 km/h on the field. From the analysis of the results, it follows that ride vibration is highest during rotary work. The magnitude of the vibration during rotary work was 1.62 times larger than the vibration during plow work. Additionally, it was confirmed that the magnitude of ride vibration increases as the tractor driving speed increases.
현 방법으로 검측된 궤도틀림 값의 원형복원에 대한 기초검토
정우진(W. J. Chung),안규일(K. I. Ahn) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
In Korea mid chord offset method has been used to measure the track irregularities. This method has been also used allover the world widely because of its accessibility and the operational excellence for measured data. But it has been pointed out recently that track irregularities reconstructed from measured data have unexpected noise in the high frequency area as the defect of this way. This study shows the cause of noise which occurs during reconstructing process and mentions the solutions briefly.