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International Trends of Psychiatric Epidemiology
YoungMoon Lee,EunSul Lee 대한신경정신의학회 2005 PSYCHIATRY INVESTIGATION Vol.2 No.1
Psychiatric epidemiology traditionally seems to be insufficient to definite measurement and case definition. Since 1900s, there had been numerable studies on prevalence and incidence of mental disorders according to diagnostic measurements. However, there is no consistent and clear consensus on psychiatric epidemiologic findings. In spite of difficulties in measurement issues, psychiatric epidemiology has advanced from vague case definition by expert’s bias to relatively concise method using scientific technology. Especially, biological advancement and genetic epidemiology made psychiatric epidemiology clearer than past several decades. Even though the more complicated methods on psychiatric epidemiology have good merits to measure between psychopathology and diagnosis, there are many limitations to explain the relationship between social, environmental factors and biological vulnerabilities. In the future direction of psychiatric epidemiology, collaborating measurements biological markers with psychosocial factors will make explain the etiological background of mental disorder easier than past years.
Byungkuk Lee,Seungchul Yang,Dongyong Kwak,Hyunkwang Jo,Youngwoo Lee,Youngmoon Bae,Jayhyung Lee Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.6
The existing wet reconversion processes for the recovery of scraps generated in manufacturing of nuclear fuel are complex and require several unit operation steps. In this study, it is attempted to simplify the recovery process of high-quality fuel-grade UO<sub>2</sub> powder. A novel wet reconversion process for uranyl nitrate hexahydrate solution is suggested by using a newly developed pulsed fluidized bed reactor, and the resultant chemical characteristics are evaluated for the intermediate ammonium uranate hydrate product and subsequently converted UO<sub>2</sub> powder, as well as the compliance with nuclear fuel specifications and advantages over existing wet processes. The UO<sub>2</sub> powder obtained by the suggested process improved fuel pellet properties compared to those derived from the existing wet conversion processes. Powder performance tests revealed that the produced UO<sub>2</sub> powder satisfies all specifications required for fuel pellets, including the sintered density, increase in re-sintered density, and grain size. Therefore, the processes described herein can aid realizing a simplified manufacturing process for nuclear-grade UO<sub>2</sub> powders that can be used for nuclear power generation.
김영문(Youngmoon Kim),이종섭(Jongsub Lee),이주용(Jooyong Lee),이창호(Changho Lee) 한국지반환경공학회 2013 한국지반환경공학회논문집 Vol.14 No.5
천연자원을 개발하기 위한 심해저 탐사의 필요성이 증가하고 있다. 동해 울릉분지에서 수행된 가스 하이드레이트 심부 시추 사업(UBGH2)에서 획득된 시료로 지반공학적 기본특성 및 강도특성을 분석하였다. 아터버그 한계, 비표면적, 입도분포 등 기본 토질 실험을 실시하고 선행연구와 비교하였다. 광물학적 특성, 화학 조성, 미세구조 관찰을 위하여 XRD, SEM 그리고 EDS를 실시하였다. 또한 벤더 엘리먼트를 설치한 삼축압축셀을 이용하여 삼축압축실험을 수행하면서 강도정수와 전단파 거동을 분석하였다. The necessity of exploration in deep sea increases to develop the natural resources. The deep marine sediments, which were recovered from the hydrate occurrence regions during the Ulleung Basin Gas Hydrate Expedition 2 (UBGH2), East Sea, Korea in 2010, are explored to obtain the geotechnical characteristics and strength parameters. The index properties of the specimens including the atterberg limits, specific surface, and particle size distribution are measured and compared with the previous studies. X-ray diffraction, scanning electron microscope, and X-ray energy dispersive spectroscopy are conducted to analyze the clay mineralogy, chemical composition, and microstructure of the sediments. Strength parameters and shear wave velocities are measured with the axial strain by using an instrumented triaxial device. The strength parameters estimated by empirical equations are compared with the experimental results.
이일권(ILkwon Lee),국창호(Changho Kook),박종건(Jonggeon Park),이정호(Jeongho Lee),신태환(Taehwan Shin),유영준(Youngjun You),이윤규(Yunkyu Lee),권영문(Youngmoon Kwon) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
This paper is to study and analyze for manufacturing of a vehicle using with 125㏄ engine. The first, we made the manufacture a car using with material of the carbon steel pipe that was 27㎜ in a diameter and 2.9㎜ on thickness. But all frame manufacture of a car as knuckle and power-train system made the same pipe, the acceleration power of a car was very disadvantage driving. Therefore this problem must improve accurately. The second, the sprocket teeth ratio of power-train system adjusted on 4.61:1 that the number of tooth processed with 13 tooth on small gear and 60 tooth on large gear. It verified the fact that the gear ratio did to optimize the driving condition on kunsan contest in 2015. The third, the suspension in chassis system softly controlled the hardness of front side and stiffly adjusted the damping force of rear shock absorbers. It was knew for the driver to advantage driving his a car. The steering system largely could make better use of a space when moving in front of pedal. Also, the brake system was improved to distribute the accurate brake force by two clutch master cylinder.
이일권(ILkwon Lee),국창호(Changho Kook),강호인(Hoin Kang),이영숙(Youngsuk Lee),권영문(Youngmoon Kwon),천창렬(Changlyeol Cheon),안성국(Sungkook An) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
The purpose of this paper is to study for the electric car using manufacturing technique. It made the single-seater personal vehicle running on road by applying the electric car system. The first, it seek to minimize the deflection using profile method that was fixed with jig instrument. The second, it improved the electric car power composed the regenerative braking system by applying the generator using in wind-generation. The third, resulting test the controller, it could certify the stability driving and manufacture side of car. The fourth the gear ratio of power-train of sprocket knew that was very good at 4.5:1 by driving test. The fifth, the driver could confirmed the durability and driving stability after installing the steering, suspension, brake and tire and wheel system.
MaengJe Cho,SuJeong Seong,JeeEun Park,InWon Chung,YoungMoon Lee,Ahn Bae,JoonHo Ahn,DongWoo Lee,JaeNam Bae,SeongJin Cho,JongIk Park,Jungwoo Son,SungMan Chang,BongJin Hahm,JunYoung Lee,JeeHoon Sohn,JinS 대한신경정신의학회 2015 PSYCHIATRY INVESTIGATION Vol.12 No.2
Objective-The aim of this study was to estimate the prevalence and correlates of mental disorders in Korean adults. Methods-Door to door household surveys were conducted with community residents aged 18–74 years from July 19, 2011, to November 16, 2011 (n=6,022, response rate 78.7%). The sample was drawn from 12 catchment areas using a multistage cluster method. Each subject was assessed using the Korean version of the World Health Organization Composite International Diagnostic Interview (CIDI) based on the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV). Results-Lifetime and 12-month prevalence estimates were as follows: alcohol use disorders, 13.4% and 4.4%, respectively; nicotine use disorders, 7.2% and 4.0%, respectively; anxiety disorders, 8.7% and 6.8%, respectively; and mood disorders, 7.5% and 3.6%, respectively. The prevalence rates of all types of DSM-IV mental disorders were 27.6% and 16.0%, respectively. Being female; young; divorced, separated, or widowed; and in a low-income group were associated with mood and anxiety disorders after adjustment for various demographic variables, whereas being male and young were associated with alcohol use disorders. Higher income was not correlated with alcohol use disorder as it had been in the 2001 survey. Conclusion-The rate of depressive disorders has increased since 2001 (the first national survey), whereas that of anxiety disorders has been relatively stable. The prevalence of nicotine and alcohol use disorders has decreased, and the male-to-female ratio of those with this diagnosis has also decreased.