태권도 앞굽이 몸통반대지르기를 통한 고령자의 건각도의 유효성 분석

김기만(Ki Man Kim),배영상(Young Sang Bae) 한국발육발달학회 2009 한국발육발달학회지 Vol.17 No.4

The purpose of this study was to identify effectiveness of Taekwondo Apkubi Momtong Bandae Jireugi (AMBJ) as diagnostic method of health related to muscle level of older men. To accomplish the purpose, relationship between a 3 stride of AMBJ distance and a cross section area of psoas major muscle were analyze. By using random sampling, 10 older men were sampled as subject who participate Gate-ball club in S-Gu, D-metropolitan city. Analysis of relation between the 3 stride of AMBJ and psoas major muscle scale recorded by MRI of older men were executed. Results of the analysis could be summarized as the following. 1) In the case of older men, the male who has much muscle weight and large thigh girth has big cross section area of psoas major muscle. 2) Relation among 3 stride of AMBJ, muscle weight(r=.822, p<.01), and thigh girth(r=.720, p<.05) especially, cross section area of psoas major muscle presented very high correlation(r=.91, p<.001). 3) Based on the analysis, measurement result of the 3 stride of Taekwondo Apkubi Momtong Bandae Jireugi was very effective diagnostic method to assume for health related to muscle strength level and all the muscular strength level of older men.

헬름홀츠 코일을 이용한 강자성체의 와전류검사

성제중,서동만,신용훈,엄태건,서동섭 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1

Ferromagnetic material like the steel tubes can easily distort eddy current testing signal due to increased magnetic permeability for defects. Because magnetic field of the test probe is affected in an inconsistent way when the material under the testing has permeability. This permeability effect can be reduced by magnetic saturation. In this paper eddy current testing system was developed to detect flaws on the steel tubes. Magnetic saturation probe with helmholtz coil was designed for saturation and inspection of the steel tubes. When using the designed test probe, the relationship between flaw signals and noises was obviously discriminated. Additionally, a high pass filter was included in the eddy current board to minimize noises due to DC magnetic field.

전력 MOSFET의 설계에 관한 연구

성만영,최연익 亞洲大學校 1985 論文集 Vol.8 No.-

Optimum design of power MOSFET's has been studied for minimum ON resistance. With the breakdown voltage given, design curves were made to determine thickness and doping concentration of the epitaxial layer for minimum epi resistance. Sensitivity of epi resistance to epi resistivity were studied in practical sense. Concentration of the channel region was calculated for the threshold voltage and gate oxide thickness. From gate-drain overlap ratio at the minimum ON resistance, optimum dimension of s and a was obtained for linear and cell geometry, respectively. A power MOSFET with the breakdown voltage of 350V was designed successfully according to the above-mentioned design procedures.

InSb化合物 半導體에 있어서의 諸效果와 그 活用性에 관한 硏究 : 高周波效果를 中心으로

成萬永 단국대학교 1984 論文集 Vol.18 No.-

This paper describes studies on various fundamental effects related to the magnetoresistive effects in InSb, of which electron mobility is known to be the highest in semiconductors. The main purpose of this paper is to contribute to a better understanding of the characteristics of the magnetoresistive devices from an engineering point of view, and then promote the development of their new application fields. The magnetoresistive effect is an effect in which a semiconductor element changes its electric resistance when a magnetic field is applied to it. The resistance change between to current electrodes is attributed to the change in the current flow in the element and the change in the resistivity. The former is a phenomenological effect and is called the geometrical effect, since it is great influenced by the geometrical configuration of the element. The latter is a magnetic field dependence of the resistivity and is called the magnetoresistivity effect or the physical magnetoresistance. In this paper, the magnetoresistive effects at a high frequency are described. Theoretical calculation has been made on high frequency transport properties of InSb under a d.c. magnetic field, leading to a conclusion that the relative increase of microwave loss in InSb under a magnetic field, γ_1 is given by γ_0{1+ω(τ_e+τ_h)}, where γ_0 is the relative resistivity increase Δρ/ρ_0 under a d.c. magnetic field with d.c. current, and γ_e and γ_h are the relaxation time for electrons and that of holes respectively. Measurements were made on the microwave power loss at 34㎓ at room temperature under magnetic fields up to 1.5 Telsa. The experimental results show an appreciable influence of ωτ on the loss even at room temperature as predicted by the theory. The influence of the surface roughness and geometry at 34㎓ has also been investigated experimentally. It has been found that these effects play an important role in high frequency properties in InSb under a magnetic field.

Volatile Flavor Components in Boiled Snow Crab (Chionoecetes japonicus) and Its Concentrated Cooker Effluent

Sung-Hee Choi,Young-Man Kim,Sook-Kyung Hyun 한국식품영양과학회 2001 Preventive Nutrition and Food Science Vol.6 No.2

The volatile flavor components of snow crabs from the Young-duk coast of Korea and their concentrated cooker effluent were isolated by a modified method from Likens and Nickerson, using a simultaneous distillation and extraction apparatus. The concentrated extract was analyzed and identified by gas chromatography and GC-MS. The flavor profile of boiled crab demonstrated that the favorable flavor characteristic of crab involved a seafood-like note, and that of concentrated cooker effluent demonstrated that the weak boiled crab flavor involved a fishy note. The main flavor components of boiled crab were heterocyclic compounds including alkylpyrazines, thizoles and thiolanes, aliphatic ketones including 2-heptanone and nonanone. On the other hand, the main flavor components of cooker effluent were aldehydes including 3-methylbutanal, alipatic ketones including 2-heptanone and alkanes including 2,6,10,14-tetramethyl-pentadecane. Almost all of heterocyclic compounds, which seem to be important contributors to the flavor of boiled crab, were not identified in concentrated cooker effluent. As a result, there may be a need to add the crab flavor components formed through model experiments of Maillard reactions to the concentrated cooker effluent for human consumption.

半導體素子의 高周波特性 向上策 樹立을 위한 새로운 電界效果 트랜지스터의 開發에 관한 硏究

成萬永 단국대학교 1982 論文集 Vol.16 No.-

A technique has been proposed for fabricating a submicronchannel Vertical V-groove field effect transistor (V-groove FET) using silicon batch processing techniques and standard photolithgraphy. The short channel length of this device is expected to make it useful for microwave applications as well as for high speed integrated circuits. The fabrication procedure is easily modified for use with compound semiconductors to take advantage of the higher mobilities and greater carrier velocities available in other materials. The fabrication procedure makes use of an anisotropically etched V-groove into a (100)p type silicon region grown on an n-silicon substrate to delineate the source of the Junction type V-groove FET. The V-groove etch is designed to be selfterminating when the distance from the bottom of the groove to the pn junction interface reaches a specified submicron value. The distance will be the channel length of the completed junction type V-groove FET. A subsequent donor diffusion into the surface of the etched groove creates the n-type channel between the source and the substrate. Metal contact at the surface of the p-region serves as the gate terminal while contacts at the V-groove surface and the substrate form the source and drain terminals, respectively. A finite-element numerical simulation of the junction type V-groove FET operation was performed using a FORTRAN program run on a Cyber-174 computer. The program alternaly solves Poisson's equation and the electron and hole continuity equations over the region of interest with mixed Dirichlet and Neumann boundary conditions until a steady-state solution is reached Low-frequecny output characteristics of the device were deduced by varying the gate and drain voltage boundary conditions over many program runs. A technique was proposed for fabricating the p n V-groove JEFT structure. This technique would utilize an anisotropic etch through a p-region into the n-substrate followed by an n-type epitaxial regrowth step in the faces of the V-groove to create the V-groove FET channel. The numerical simulation predicts a higher transconductance for this structure. The lack of adequate epitaxial facilities precluded the fabrication and evaluation of such a structure. As the results of the experimental fabrication, the microwave V-groove FETs are obtained. The cut off frequencies are calculated to be 56㎓ by Linvill's power gain equation using the measured capacitance and transconductance.

가토의 뇌동맥류 모형에서 모동맥 및 동맥류 협자에 따른 동맥류 내압의 변화 :기초 연구

김은영,송준혁,김명현,박향권,김성학,신규만,박동빈 대한신경외과학회 1999 Journal of Korean neurosurgical society Vol.28 No.4

부산지역 무균성 뇌막염 원인 바이러스의 분리 및 동정 : 1998년을 중심으로

김영희,정영기,김기순,지영미,윤재득,김병준,구평태,민상기,정구영,김만수,조경순 동의대학교 기초과학연구소 2000 基礎科學硏究論文集 Vol.10 No.1

The incidence of aseptic meningitis infection is ensuing and threatening the health of children. Enteroviruses are the major agents of aseptic meningitis and identification of virus has been a clue to diagnosis and epidemiology. The outbreak of aseptic meningitis occurred in Pusan, 1998. Patients were concentrated from April through November. Children were more susceptible than adults. Among 306 cases of specimens from stool, throat swab tested, only 7.2% were positive on virus isolation, 12 cases from stool and 10 from throat, respectively. All isolated 7 serotypes of viruses represented cytopathic effect on cultured cells. Three types of echovirus 6, 25, 30 and coxsackievirus B2, B3, B4, B6 were identified by neutralizing anti body test. Isolated coxsackievirus and echovirus were observed by an electron microscope with negative staining.

DOC의 K-7 Mode에 의한 배기가스 저감에 관한 연구

한영출,백두성,오용석,박만재,박귀열,류규현 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.3

With the significant growth of the number of vehicles, environmental problems is raised. NOx, SOx, and PM emissions in diesel powered vehicles are larger than that in gasoline, because the development of pollutants reduction techniques has no: been yet achieved. So it is need to develop after-treatment or to convert into alternative fuel to satisfy emission regula-tion. Among the after-treatment systems to reduce the diesel emissions, studies with diesel oxidation catalyst(DOC) are done greatly. In this study using DOC, reduction efficiency with the change of temperature and catalyst loading was calculated through measurements of CO, HC, PM, and SOx.

결합비를 조정할 수 있는 광 결합기에 관한 연구

尹星鉉,鄭萬永 東亞大學校 大學院 1989 大學院論文集 Vol.14 No.-

When optical coupler is fabrecated with the polished single mode potical fiber, coupling ratio is controlled by the off α set of the coupler block. that caused the effective coupling length. In this paper, we propose the condition that coupling ratio is 0%, 50%, 100% by the effective coupling length.