• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.5
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• pp.66-72
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• 2019

To improve ride quality and running stability of high speed train(HST), it is important that connection between coaches adopts the articulated bogies by using a gangway ring, unlike the conventional independent bogies assembled with car bodies. Although the gangway ring should be ensured absolute safety against passenger movement between coaches during train operation, there is still a lack of quantitative durability criteria of that. Therefore, in order to improve the passenger safety of HST, it is important to study the test requirements on durability evaluation for the ring. In this study, seven mixed loading cases were derived from the triaxial loading(vertical/lateral/longitudinal) modes. The safety factor of each component is at least 2.4 or more from the results of the finite element analysis. In addition, fatigue safety was evaluated through durability analysis from the viewpoint of strain-life design. Durability tests for the gangway ring carried out a total of 10 million cycles in 4 phases load conditions. After the durability test, the defect of each component was investigated using nondestructive testing techniques.

• Journal of the Korean Society for Precision Engineering
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• v.20 no.7
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• pp.201-207
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• 2003

Sensitivity analysis of suspension elements of an articulated bogie for light railway vehicles is presented. The ride, stability and safety are used as dynamic performance indices. Suspension elements of 10 and a conicity of wheel are used as design variables. To analyze sensitivity of design variables. the railway vehicle dynamics analysis program AGEM is used. The results show that the secondary suspension elements have a strong effect on ride and the primary suspension elements have a moderate effect on ride. Conicity of wheel has a strong effect on the stability. The safety is not effected by all the design variables.

• Journal of the Earthquake Engineering Society of Korea
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• v.4 no.4
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• pp.117-123
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• 2000

열차와 교량의 3차원 모델링을 사용한 고속철도 교량의 동적해석이 수행되었다. 철도교의 모델인은 판요소와 3차원 뼈대요소로 모델링되었다. 상판과 주형 사이의 offset은 기하학적인 구속조건을 사용하여 고려하였다. 본 연구에서 사용된 고속철도는 2량의 동력차와 2량의 모터차와 16량의 객차로 구성되어 있다. 관절형 대차로 연결되어 전체 열차계의 운동방정식은 Lagrange 방정식을 이용하여 유도되었으며, 차제와 대차 그리고 자축의 3차원인 운동을 고려하였다. 이동 열차에 의한 교량의 응답은 predictor-corrector 반복법에 의한 Newmark-$\beta$ 법에 의해서 그 해가 구해진다. 매개변수해석에 의해서 열차의 이상화방법, 열차의 제동, 철도교량의 주행면 조도에 의한 영향이 고찰되었다.

• Proceedings of the KSR Conference
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• 1998.11a
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• pp.522-529
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• 1998

In this study, system analysis for a train vehicle with an articulated bogie frame adopted in TGV and TGV-K system is performed. System analysis is carried out as follows. First, modal analysis of each subsystem is performed to obtain the natural frequencies and mode shapes. Then modal analysis, of a whole vehicle is performed to obtain the potential interaction between the subsystems. Finallyforced response analysis, such as driving point mobility, is performed to obtain the dynamic response of specific points.

• Proceedings of the KSR Conference
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• 1998.11a
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• pp.421-428
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• 1998

Sensitivity analysis of suspension elements of an articulated bogie for light railway vehicles is presented. The ride, stability and safety are used as dynamic performance index. Suspension elements of 10 and a conicity of wheel are used as design variables, To analyze sensitivity of design variables, the railway vehicle dynamics analysis program AGEM is used. The results shows that the secondary suspension elements have a strong effect on ride and the primary suspension elements have a moderate effect on ride. Conicity of wheel has a strong effect on the stability, The safety is not effected by all the design variables.

• Journal of Korean Society of Steel Construction
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• v.20 no.1
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• pp.151-163
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• 2008

A formulation of three-dimensional model of articulated train-b ridge dynamic interaction has been made for the Korean eXpress Train (KTX). Semi-periodic profiles of rail irregularities consisting of elevation, alignment, cross and gauge irregularities have also been proposed using FRA maximum tolerable rail deviations. The effects of rail joints and sleeper step were also included. The resulting system matrices of train and bridge are very spare, and thus, are stored in one-dimensional arrays, yielding a time-efficient solution. A numerical algorithm for computing bridge-train response including an iterative scheme is also formulated. A program simulating train-bridge interaction and solving this problem using the new algorithm is implemented as new modules for the f inite element analysis software named XFINAS. Computed results using the new program are then checked by that of the validated 2-D bridge-train interaction model. This new 3D analysis provides more detailed train responses such as swaying, bouncing, rolling, pitching and yawing accelerations, which are useful inevaluating passenger riding comfort. Train operation safety and derailment could also be directly investigated by relative wheel displacements computed from this program.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.2
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• pp.576-582
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• 2017

The switching system in a maglev train is an indispensable element for distributing train routes, and it should be designed to ensure safe operation. Unlike conventional wheels on rails, the switching track in EMS-type maglev is supported by a group of 3 to 4 steel girders. When the vehicle changes its route, the segmented track allows the girders to change from a straight position to a curved one with a small radius of curvature. Hence, the structural characteristics of the segmented switching system may affect the levitation stability of the maglev vehicle. This study experimentally evaluates the dynamic interaction between maglev vehicles and a segmented switching system. The results may be helpful for improving the switching system. The measured levitation and lateral air gaps were evaluated at a vehicle speed of 25 km/h, and the ride quality of the Maglev vehicle was determined to be "comfortable" according to the UIC 513 standard.

• Journal of Korean Medical classics
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• v.20 no.2
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• pp.269-288
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• 2007

"표유부(標幽賦)"포라료침구경락적기본이론화자오유주침법(包羅了鍼灸經絡的基本理論和子午流注鍼法) 유주팔법등침구임상이론(流注八法等鍼灸臨床理論), 역우기송(易于기송), 통과대차(通過對此)"표유부(標幽賦)"급역대주석가대(及歷代注釋家對) "표유부(標幽賦)" 주석적연구(注釋的硏究). 금득출여하결론(今得出如下結論): 1. "표유부(標幽賦)"중출현적두한경적학술사상(中出現的竇漢卿的學術思想), 시재계승(是在계承)"내경(內經)"화(和)"난경(難經)"적침구학(的鍼灸學), 이론적기본상(理論的基本上), 진일보발전이성적(進一步發展而成的). 대후세침구학적발전산생료중요적영향(對後世鍼灸學的發展産生了重要的影響). 2. 유우폐경적경기유운문혈수출(由于肺經的經氣由雲門穴輸出), 연경락순행체표(沿經絡循行體表), 우시사운문혈구유료통경행기적주치작용(于是使雲門穴具有了通經行氣的主治作用), 고이불설'혈출중부'(故而不說'穴出中府'), 이제출'혈출운문'(而提出'穴出雲門'), 저시두한경재침구이론방면적독도지외(抵是竇漢卿在鍼灸理論方面的獨到之外). 3. 소우침구보사(소于鍼灸補瀉), 인위수지보사법적작용중우호흡보사(인위手指補瀉法的作用重于呼吸補瀉), 제시료순(提示了循), 문, 제(堤), 안(按), 탄(彈), 염, 차, 반(盤), 추, 내(內), 동(動), 요(搖), 조(爪), 절적십사종침자보사수법(切的十四종鍼刺보瀉手法). 4. 제출침자전요관찰확인침구유무이상손상(提出鍼刺前要觀察確인鍼具有无이常損상), 시침전요냉침온난(施鍼前要냉鍼온暖), 시침시요예방절침화피부근육적손상(施鍼時要預防折鍼和皮膚筋肉的損傷), 제출좌수당중이다안침혈(提出左手當重而多按鍼穴), 우수경이서서염전자입적수법(右手경而徐徐捻轉자入的手法), 인위사용쌍수진침위호(인위使用쌍手進鍼위好). 5. 호침가관통경락기혈운행적통로(毫鍼可관通經絡氣血運行的通路), 여오행상응(與五行相應), 인이가평오장지한열(因而可平五臟之寒熱), 가조육부지허실(可調六腑之虛實), 유견사부정지공(有견邪扶正之功), 재구침중응용최위광범(在九鍼中응用最위광泛). 6. 제출침자시요관찰본신(提出鍼刺時要관察本神), 대우'본신'구체가간주시환자적'맥기'화'혈기'(對于'本神'具체可看做是患者的'脈氣'和'穴氣'), 종대적방면간가간주시환자적정신(종大的方面看可看做是患者的精神). 7. 제시료참조전후좌우지혈정확취혈적방법(提示了參照前後左右之血正確取穴的方法), 여참조주변경락확정경락적방법(여參照周邊經絡確定經絡的方法), 병강조요준조골도분촌화굴신수족관절적방법취혈재능취혈정확(병强調要遵照骨度分寸和屈伸手足關節的方法取穴才能取穴正確). 8. 소우두면오관(소于頭面五官).인후경항(咽喉頸項).흉복부(胸腹部), 요배부(腰背部), 부인(婦人) 소아(小兒) 사지등질환(四肢等疾患), 개소료침구치료적경험화심득(介沼了療鍼灸治療的經驗和心得), 제시료자오유주축일안시개혈침법여영구팔법등안시취혈침법(提示了子午流注逐日按時開穴鍼法여靈驅八法等按時取穴鍼法), 성위후세각종안시개혈침법적기초(成위後世各種按時開穴鍼法的基초).