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방수재료의 거동대응성능 시험시 비 구속조건에서의 구조물 거동 대응성능 평가의 한계와 향후 개선 방안 제안
안기원 ( An¸ Ki-won ),오규환 ( Oh¸ Gyu-hwan ),김수연 ( Kim¸ Soo-yeon ),오상근 ( Oh¸ Sang-keun ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
As structure and the waterproofing material are compressed through the backfilling process after the waterproofing material is installed on the underground structure at the actual site, there is a difference between the behavioral response force of the waterproofing material in the compressed state and the behavioral response force in the non-constrained state. In this regard, we will analyze the limitations of the current structural behavioral response evaluation and suggest an improvement plan so that the future test and evaluation environment can be evaluated under conditions similar to the field.
강체전차선로 고속화를 위한 설계파라미터 민감도 분석 연구
이기원(Kiwon Lee),조용현(Kiwon Lee),권삼영(Sam-Young Kwon),박영(Young Park) 대한전기학회 2017 전기학회논문지 Vol.66 No.2
R-Bar (Overhead Rigid Conductor system) has been lately used for the speed of over 200 ㎞/h in Europe, while it has been developed and used for the max. speed of 120 ㎞/h in Korea. Because R-Bar has advantages of reduction of tunnel cross sectional area and maintenance, its development for more high-speed is urgent in Korea having many mountain area. Therefore a sensitivity analysis of design parameters for the speed-up of R-Bar has performed in this study. For the analysis, we have developed a program for the prediction of dynamic characteristics between a pantograph and R-Bar. The program was evaluated with the actual test result and a current collection performance according to the parameters such as a distance between brackets, a stiffness of bracket and of R-Bar rail was predicted with the program.
Design of Wireless Power Transfer System for Railway Application
Kiwon Hwang,Seonghwan Kim,Seongkyu Kim,Yangbae Chun,Seungyoung Ahn 한국철도학회 2012 International Journal of Railway Vol.5 No.4
As wireless power transfer (WPT) technologies emerge in a wide range of applications including public transportation, many expect that applying the technology to the current railway systems will bring positive effects to current railway systems. In this paper, we introduce design methodology of a WPT system for railway application. Fundamental principles of magnetic fields and a WPT circuit are first analyzed, and advantages and efficiency of a possible train system are discussed. It then examines other significant factors such as performance requirements and EMC criteria to design a wireless train system.
Kiwon Kim,HongJin Jeon 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.6
Suicide attempts at the Han river are rapidly increasing, which are 4.11 times from 2005 to 2015, whereas the rate of completed suicide in South Korea increased 1.07 times during the same period. However, few studies have been conducted on the issue because many suicide attempters were seriously injured after a fall in the Han river. We present a case of a patient with major depressive disorder (MDD) who attempted suicide and minimally injured after jumping from the bridge at the Han river. We could assess his psychological and neurocognitive functions before and immediately after his attempt. From this case, we can identify that higher cognitive aspect of executive dysfunction, especially in the frontal domain of selective attention and inhibition, may be associated with his suicide attempt. In conclusion, we suggest psychiatric treatments for cognitive impulsiveness and safety barriers at the bridge to prevent suicide attempts of patients with MDD.