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Jung, WooYoung,Ju, BuSeog 한국지진공학회 2013 한국지진공학회논문집 Vol.17 No.4
The construction costs for nonstructural systems such as mechanical/electrical equipment, ceiling system, and piping system occupy a significant proportion of the total cost. These nonstructural systems can also cause considerable economic losses and loss of life during and after an earthquake. Therefore, reduction of seismic risk of nonstructural components has been emerging as a key aspect of research in recent year. The primary objective of this study was to evaluate the seismic performance of a single-story and multi-story piping system installed in low-rise building and to identify the seismic vulnerability of the current piping systems. The seismic performance evaluation of the piping systems was conducted with 5 different earthquakes to account for the ground motion uncertainty and the preliminary results demonstrated that the maximum displacements of each floor in the multi-story piping system increased linearly with increasing floor level in the building system. This study revealed that the current design piping systems are significantly sensitive to the effect of floor height, which stress the necessity to improve the seismic performance of the current piping systems by, for example, strengthening with seismic sway bracing using transverse/longitudinal bracing cables or hangers.
Times to Discontinue Antidepressants Over 6 Months in Patients with Major Depressive Disorder
WooYoung Jung,SaeHeon Jang,SungGon Kim,YoungMyo Jae,BoGeum Kong,HoChan Kim,ByeongMoo Choe,JeongGee Kim,ChoongRak Kim 대한신경정신의학회 2016 PSYCHIATRY INVESTIGATION Vol.13 No.4
Objective-The aim of the present study was to investigate differences in discontinuation time among antidepressants and total antidepressant discontinuation rate of patients with depression over a 6 month period in a naturalistic treatment setting. Methods-We reviewed the medical records of 900 patients with major depressive disorder who were initially prescribed only one kind of antidepressant. The prescribed antidepressants and the reasons for discontinuation were surveyed at baseline and every 4 weeks during the 24 week study. We investigated the discontinuation rate and the mean time to discontinuation among six antidepressants groups. Results-Mean and median overall discontinuation times were 13.8 and 12 weeks, respectively. Sertraline and escitalopram had longer discontinuation times than that of fluoxetine, and patients who used sertraline discontinued use significantly later than those taking mirtazapine. No differences in discontinuation rate were observed after 24 weeks among these antidepressants. About 73% of patients discontinued antidepressant treatment after 24 weeks. Conclusion-Sertraline and escitalopram tended to have longer mean times to discontinuation, although no difference in discontinuation rate was detected between antidepressants after 24 weeks. About three-quarters of patients discontinued antidepressant maintenance therapy after 24 weeks.
Analytical Study of the Vibration Attenuation with respect to Trackbed Systems
WooYoung Jung,SeongHyeok Lee,JinWook Lee,MinHo Kwon,BuSeog Ju 한국철도학회 2014 International Journal of Railway Vol.7 No.2
The vibration-attenuation was quantitatively compared by 3-Dimensional finite element analysis using ABAQUS, with respect to the change of the type of trackbed systems. Most common trackbed materials, including ballast and concrete were applied to the track structure, and the train-speed was set as 300km/h as Korea Train eXpress (KTX). The result of current study revealed that the ballast showed the most effective material for the vibration attenuation.
Analytical Study of the Vibration Attenuation with respect to Trackbed Systems
Jung, WooYoung,Lee, SeongHyeok,Lee, JinWook,Kwon, MinHo,Ju, BuSeog The Korean Society for Railway 2014 International Journal of Railway Vol.7 No.2
The vibration-attenuation was quantitatively compared by 3-Dimensional finite element analysis using ABAQUS, with respect to the change of the type of trackbed systems. Most common trackbed materials, including ballast and concrete were applied to the track structure, and the train-speed was set as 300km/h as Korea Train eXpress (KTX). The result of current study revealed that the ballast showed the most effective material for the vibration attenuation.
벡터필드 유도기법이 적용된 다수 무인기를 이용한 적 방공망 제압 임무의 실험적 검증
정우영(Wooyoung Jung),김기덕(Ki-duck Kim),이성헌(Seongheon Lee),방효충(Hyochoong Bang) 한국항공우주학회 2015 韓國航空宇宙學會誌 Vol.43 No.3
현대전에서 적 방공망 제압 임무는 과거에 비해 그 중요성이 점차 부각되고 있다. 그러나 본 임무는 적의 방공망에 아군의 항공기와 조종사가 노출되는 위험을 안고 있어, 아군의 피해를 최소화하면서 효과적으로 임무를 수행할 수 있도록 하는 연구가 활발히 진행되고 있다. 본 논문에서는 이러한 연구의 일환으로써, 벡터필드 유도기법을 이용하여, 다수 무인기의 적 방공망 제압 임무를 설계하였다. 벡터필드 유도기법은 다른 유도기법들에 비하여 계산 량이 적고 쉽게 응용이 가능한 이점이 있어, 다수 무인기 운용에 해당 기법을 적용하는 경우 무인기간의 상호 협동을 통한 다양한 형태의 임무를 계획할 수 있다. 따라서 벡터필드 유도기법을 이용한 다수 무인기의 적 방공망 제압 임무의 설계방법을 제시함과 동시에, 비행실험을 통하여 그 운용 가능성을 확인해 보았다. In modern warfare, the importance of SEAD(Suppression of Enemy Air Defense) mission is being emphasized. However, this mission runs the risk of hull damage or casualties of our friendly air forces. Because of these risks, research on the way of minimizing damages and enhancing mission capability is under active discussion. As a part of this research, SEAD mission planning with multiple UAVs has been covered using vector field guidance. This guidance method not only applies to various forms of flight path but also requires less computational power than other guidance methods. Therefore, in this paper, planning methods of SEAD mission for multiple UAVs using vector field guidance and experimental data from flight experiments regarding designed mission has been covered.