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수열합성법을 이용하여 우선 배향된 ZnO 나노와이어 성장 및 발광 특성
김종현,임연수,김성현,조진우,정대용,Kim, Jong-Hyun,Lim, Yun-Soo,Kim, Sung-Hyun,Jo, Jin-Woo,Jeong, Dae-Yong 한국재료학회 2011 한국재료학회지 Vol.21 No.12
1-D ZnO nanowires have been attractive for their peculiar properties and easy growth at relatively low temperature. The length, diameter, and density of ZnO nanowires were determined by the several synthetic parameters, such as PEI concentration, growth time, temperature, and zinc salt concentration. The ZnO nanowires were grown on the <001> oriented seed layer using the hydrothermal process with zinc nitrate and HMTA (hexamethylenetetramine) and their structure and optical properties were characterized. The morphology, length and diameter of the nanowires were strongly affected by the relative and/or absolute concentration of $Zn^{2+}$ and $OH^{-1}$ and the hydrothermal temperature. When the concentrations of the zinc nitrate HMTA were the same as 0.015 M, the length and diameter of the nanowires were $1.97{\mu}m$ and $0.07{\mu}m$, respectively, and the aspect ratio was 28.1 with the preferred orientation along the <001> direction. XRD and TEM results showed a high crystallinity of the ZnO nanowires. Optical measurement revealed that ZnO nanowires emitted intensive stimulated UV at 376 nm without showing visible emission related to oxygen defects.
논문(論文) : 강직성척추염(Ankylosing Spodylitis)에 대한 한의학적 이해
김종현 ( Jong Hyun Kim ),윤은경 ( Eun Kyung Yoon ),백유상 ( You Sang Baik ),정상현 ( Chang Hyun Jeong ),장우상 ( Woo Chang Jang ),류정아 ( Jeong Ah Lyu ) 대한한의학원전학회(구 대한원전의사학회) 2012 대한한의학원전학회지 Vol.25 No.3
Objective : Ankylosing Spodylitis(AS) is a chronic inflammatory disease that is notorious for its difficulty to cure. This study aims to interpret the mechanism of AS in the Traditional Korean Medical(TKM) perspective, and to understand the role of the spine. Method : Clinical manifestations of AS, epidemiological data and clinical cases were interpreted by traditional methodology. Result : The young age group of patients suffering from this condition suggests that the cause of this condition is not solely linked to deficiency of the Kidney[腎], which is a general cause for bone disease. Its symptoms are linked to obstruction in the upper body, which results in disturbance of Jeong(精) collection in the lower body. Based on other accompanying symptoms, together with its character as an autoimmune disease, a strong link to the spirit of the heart[心 神] can be suggested. Conclusion : AS is closely linked not only to essence of kidney[腎陰], but to the spirit of the heart[心神] as well. From the TKM analysis of the spine, we can understand it as the basic pathway for the fundamental Gi(氣) circulation.
메탄/산소 이원추진제 로켓엔진의 이론성능해석과 예비형상설계
김종현(Jong Hyun Kim),정훈(Hun Jung),구재우(Jae Woo Koo),김정수(Jeong Soo Kim) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.5
차세대 로켓엔진으로 각광받고 있는 메탄/산소 이원추진제 엔진에 대한 이론성능특성을 분석하였다. CEA를 활용한 연소성능 분석을 통해 엔진의 이론성능을 파악하였으며, 추진제 액적의 1차원 기화해석을 수행하여 추진제 혼합비 및 추력실 내부압력에 따른 특성길이(L<SUP>*</SUP>)를 도출하였다. 또한, 개발엔진의 지상연소시험에 대비하여 초음속 노즐의 최적 팽창비를 계산하였으며, 지상연소 이론성능분석을 통한 엔진의 설계제원이 제시되었다. A theoretical performance analysis was conducted for methane/oxygen bipropellant rocket engine taking the limelight in the world as a next-generation rocket engine. The theoretical performance of engine was scrutinized through the results of combustion performance analysis by using CEA. And, characteristic length(L<SUP>*</SUP>) according to the chamber pressure variation was calculated using one-dimensional liquid-drop vaporization analysis. In addition, optimum expansion ratio of supersonic nozzle was calculated for ground firing test of the development engine and engine design specifications for ground condition were proposed by analysis for theoretical performance characteristics.
메탄을 연료로 하는 이원추진제 로켓엔진의 이론성능특성 분석
김종현(Jong Hyun Kim),정훈(Hun Jung),김정수(Jeong Soo Kim) 한국추진공학회 2014 한국추진공학회지 Vol.18 No.3
A set of preliminary design parameters for the bipropellant rocket engine using liquid methane-fuel as green propellant were derived through a theoretical performance analysis. Chemical equilibrium analysis utilizing CEA was conducted for the prediction of combustion performance: combustion characteristics according to the O/F ratio and chamber pressure variation were investigated. For a determination of chamber-characteristic length, the vaporization time of fuel-droplet with various performance parameters was calculated by applying Spaldings 1-D droplet vaporization model. Finally, the preliminary design specification of methane-bipropellant rocket engine, which is to be performance-tested under the ground firing condition, was proposed.
論文(론문) : 『臟腑標本虛實寒熱用藥式(장부표본허실한열용약식)』의 標本病(표본병) 구분에 대한 考察(고찰)
김종현 ( Jong Hyun Kim ),백유상 ( You Sang Baik ),정창현 ( Chang Hyun Jeong ),장우창 ( Woo Chang Jang ) 대한한의학원전학회(구 대한원전의사학회) 2013 대한한의학원전학회지 Vol.26 No.4
Zhang Yuan-Su(張元素) was a doctor of the Jin(金) period, who was followed by Li Dong-Yuan(李東垣) and Wang Hao-Gu(王好古), creating the Yishui School(易水學派). The most notable aspect of his theory is the internal organs(臟腑)-based diagnostic system. He organized previous methods based on the internal organs and applied the same methodology in treatment as well. The Zangfu-biaoben-xushi-hanre-yongyaoshi(臟腑標本虛實寒熱用藥式) is one of his major publications in which diagnostic and treatment methods are organized in a simple manner. In this book, the diseases of the organs are divided into the tip and root(標本). This paper investigates the standards of categorizing tip and root diseases through analysis of all symptoms of both tip and root diseases of the five internal organs. Then the results of the analysis were used in grasping the similarities and tendencies of the root disease and tip disease. Conclusively, root diseases indicate disorder in the internal organs themselves. Tip diseases indicate disorder in the channels and collaterals, diseases caused by exterior pathogens or symptoms that manifest in the exteriors of the body. Such categorization is thought to have been established to eliminate diagnostic error that could occur from using the same expressive means in describing symptoms with different causes, in the process of forming an uncomplicated diagnostic system.
김종현 ( Jong-hyun Kim ),나춘기 ( Choon-ki Na ),이정인 ( Jeong-in Lee ),김도용 ( Do-yong Kim ) 한국환경기술학회 2021 한국환경기술학회지 Vol.22 No.4
In this study, the adsorption capacity of formaldehyde was analyzed by using Activated Carbon and five types of synthetic zeolite. The experiments were conducted according to 2,4-dinitrophenylhydrazine (DNPH) derivatization and high pressure liquid chromatography (HPLC) methods for analysis of formaldehyde. The adsorption capacity of formaldehyde was discussed by outflow/inflow of concentration, amount of adsorption per gram of adsorbent, averaged removal rate and economic evaluation. Total amount of adsorption per gram of adsorbent decreased steadily for increasing the fill amount of adsorbent. The most amount of adsorption was represented for Beta Zeolite Fe, but the economic evaluation was relatively high for Zeolite A. Activated Carbon showed relatively superior persistence of adsorption in the adsorption experiment for 200 minutes. The stability of adsorption was evaluated to relatively superior for Zeolite X in the repeated experimental results of the 20 minutes adsorption for formaldehyde. This study suggested that the selective use of various synthetic zeolite may be useful for formaldehyde removal considering adsorption capacity and economic feasibility.
광학계측기법에 의한 비충돌형 인젝터의 거시적 분무거동 고찰
김종현(Jong Hyun Kim),정훈(Hun Jung),김정수(Jeong Soo Kim) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.5
본 연구팀에서 개발 중인 중형급 하이드라진 추력기에 장착되는 비충돌형 인젝터의 거시적 분무거동을 관찰하였다. 전자현미경을 이용하여 인젝터 오리피스의 인수검사를 수행하였으며, 슐리렌 기법과 고속카메라로 획득한 순간 분무이미지를 통하여 압력변이에 따른 인젝터의 초기 동작특성 및 분무성능을 확인하였다. 또, 분무침투거리에 따른 속도와 무차원 매개변수를 이용하여 인젝터의 성능을 검증하였다. 인젝터 오리피스의 가공오차에 의한 분무분열 특성 차이가 확인되었으며, 특정 압력수준에서 이상 분무거동이 관찰되었다. This study is an investigation on macroscopic spray behavior of nonimpinging-type injector equipped on the hydrazine thruster under development. An electron microscope is employed for the acceptance examination of injector orifice. Initial performance characteristics and spray behavior of injector are observed through the instantaneous spray images which are captured by high speed camera and Schlieren method with varying injection pressures. The injector performance is scrutinized by the velocity along with penetration length of spray and categorized by dimensionless parameters. It is confirmed that there exist varying characteristics related to the spray breakup caused by fabrication errors of injector-orifices. Unexpected spray behavior, which needs to be reexamined, is grasped at specific pressure level, as well.
『황제내경(黃帝內經)』의 사시별(四時別) 오수혈(五輸穴) 취혈법(取穴法)에 대한 소고(小考)
김종현 ( Jong Hyun Kim ),정창현 ( Chang Hyun Jeong ),장우창 ( Woo Chang Jang ),백유상 ( You Sang Baik ) 대한한의학원전학회 ( 구 대한원전의사학회 ) 2009 대한한의학원전학회지 Vol.22 No.1
Traditionally, Korean Medicine put emphasis on the treatment and health-preserve method that corresponds with circulation of nature. And acupuncture is no exception to this rule. In 『Hwangjenaegyeong(黃帝內經)』, some chapters present method that is changed according to the seasons. Among the chapters, there are some difference, but we can find a general theory. In spring, Yanggi(陽氣) is coming out but not strong and cannot diffuse. so the Yanggi(陽氣) hang up the middle of outer layer. Therefore, we can take some acupoints around the muscle interspace[分주] or tiny branches of Meridian[孫絡]. In summer, Yanggi(陽氣) flourish and boil all around of the outer layer. So, we can take some acupunctural points from skin to the yang-meridian. In both fall and winter, five su point[五輸穴] make up almost of point. in fall, yanggi begin convergence. We can remove the Eum-pathogen[陰邪] and help the normal convergence by using Stream point[수穴], River point[經穴] and Sea point[合穴]. In winter, Eum surround so solidly that the neo Yanggi(陽氣) cannot come out. So, we can break the yin by using Well point[井穴] and make be strong by Spring point[滎穴]. If we Study the method that correspond with the seasonal circulation more, we will be able to treat diseases more minutely.
단일액체추진제 하이드라진 추력기의 추력실 직경에 따른 정상상태 추력특성 고찰
김종현(Jong Hyun Kim),정훈(Hun Jung),감호동(Ho Dong Kam),서항석(Hang Seok Seo),김정수(Jeong Soo Kim) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
우주발사체 자세제어용 엔진으로 활용되기 위한 70 N급 하이드라진 추력기의 성능특성을 검토하였다. 개발모델 하이드라진 추력기에 대한 성능평가 시험이 추력실 직경변화에 따라 정상상태 연소모드 조건으로 수행되었으며, 지상연소시험에서 획득한 추력, 추진제 공급유량 그리고 추력실의 압력 및 온도 등의 성능변수를 통해 추력기의 성능을 평가하였다. 시험결과, 표준모델의 특성속도는 1256 m/s로 98.9%의 우수한 특성속도 효율을 보였다. Performance characteristics of 70 N-class hydrazine thruster to be utilized for the attitude control engine of space launch vehicles were scrutinized. Thruster test for the performance evaluation was carried out in steady-state firing mode with the variation of thrust-chamber diameter . The hydrazine thruster was evaluated by the performance variables in terms of thrust, propellant flow rate, chamber pressure, and temperature. As a result, it is found that standard model thruster has excellent characteristic velocity efficiency of 98.9% at 1256 m/s of characteristic velocity.