http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
정국현,심일섭,김종욱 한국체육대학교 교양교육연구소 2002 韓國體育大學校 敎養敎育論文集 Vol.- No.7
The purpose of this study was to investigate the influence of Taekwon-do training on high school student’s emotional development. For this purpose, 651(male=334, female=317) high school student’s were select as subjects. The questionnaire that was used Kang(1996) was also used in this study. The statistics selected in this study were descriptive statistics, one-way ANOVA, and Schefe post hoc test. As a result of the analyses of collected data, the following conclusions were obtained: firstly, there was a significant difference in high school student's emotional development by socio-demographic variables. Secondly, high school student's fear response is different according to their level of Taekwon-do training.
용접입열량에 따른 CO₂용접부의 기계적 특성에 관한 연구
국정한,성호현 한국기술교육대학교 2001 論文集 Vol.8 No.1
ABSTRACT In this study, we investigate the welding characteristics, mechanical properties, stress intensity, fracture strength, and microstructure in the fusion zone of SS400 steels which were welded at four different heat inputs(10, 15, 20, and 25 KJ/cm) using either the flux cored wire (FCW) or solid wire (SW) in the CO2 welding system. Based on arc's stability, spatter, thinned-slag detachment, and bead apperance results, the mechanical properties of the FCW were much better than those of the SW. They decreased as heat increased. The increase of heat input and notch depth result in a decrease of the impact energy.
국정한,성호현,송일규 한국기술교육대학교 1997 論文集 Vol.4 No.1
In this study, the crack behavior around the bonded dissimilar materials is analyzed by using by Finite Element Method(FEM) in case that it approaches or passes through the bonded line perpendicularly. The analysis criterion is based on the energy(△U) when the crack progresses or passes through the bonded line. The variables are the width of dissimilar material and distance from the crack tip to the bonded line. Values of E(Young's modulus), V(Poisson's ratio) and △U(Energy) for base material are different from those(E', V', △U') for dissimilar material. The outcome of this study is obtained by comparing △U with △U'
국정한,송일규,김봉중,오세용,성호현 한국기술교육대학교 1999 論文集 Vol.6 No.1
In this work, we studied the mechanical properties, structure and the stress intensity factor of the welded areas which were annealed from 500。C to 900。C with an interval of 100。C. The main results are as follow. 1. The as-welded specimen showed the highest tensile strength and yield point. The tensile strength and the yield point decrease as the annealing temperature increased from 500。C to 900。C, and they became smaller in the order of deposited metal, heat affected zone and base metal. 2. The hardness was maximum at about 9 mm from the welding center line, and it decreased drastically in the heat affected zone located between 9∼15mm from the center line. 3. The elongation decreased in the order of base metal, the fusion zone and heat affected zone while it increased as annealing temperature increased. 4. The stress intensity factor(S. I. F.) declined as the length of notch increased and it became smaller in the order of fusion zone, base metal and heat affected zone. This is because fracture toughness is affected by brittlization at heat affected zone as well as the initiation and propagation of cracks.
AMPS 시스템과 주파수를 공유하는 CDMA시스템의 링크 해석
문병현,손병국,최정희 대구대학교 과학기술연구소 1999 科學技術硏究 Vol.5 No.5
In this paper, the forward and reverse link cellular capacities analysis of code division multiple access (CDMA) is performed when the systems are sharing the same frequency band. It is assumed that the frequency reuse pattern K=5 is used for the analysis. Formule that describe the relationship between the number of CDMA and AMPS users for a given carrier to interference ratio (GI) of each are presented. In the comparison of the forward and reverse link analysis, forward link is smaller than reverse link. Therefore, the system capacity depends on the forward link rather than the reverse link.
복합 산화법과 MEMS 기술을 이용한 RF용 두꺼운 산화막 에어 브리지 및 공면 전송선의 제조
김국진,박정용,이동인,이봉희,배영호,이종현,박세일 한국센서학회 2002 센서학회지 Vol.11 No.3
본 논문에서는 양극반응과 복합 산화법( H_2O/O_2 분위기에서 500℃, 1시간 열산화와 1050℃, 2분간 RTO(Rapid Thermal Oxidation) 공정)을 이용한 두꺼운 OPSL(Oxidized Porous Silicon Layer)을 형성하여 이를 마이크로머시닝 기술을 이용함으로써 10 ㎛두께의 OPS(Oxidized Porous Silicon) 에어 브리지를 제조하고, 그 위에 전송선로를 형성하여 그 RF 특성을 조사하였다. OPS 에어 브리지 위에 형성된 CPW(Coplanar Waveguide)의 손실이 OPSL 위에 형성된 전송선의 삽입손실보다 약 2 dB 정도 적은 것을 보여주었으며, 반사손실은 OPSL 위에 형성된 전송선의 반사손실보다 적으며 약 -20 dB를 넘지 않고 있다. 본 연구에서 개발한 산화된 다공질실리콘 멤브레인 및 에어 브리지 구조는 CMOS 공정 후에 사용 가능하며, 초고주파 회로 설계시 편리성과 유용성을 제시하고 있다. This paper proposes a 10 ㎛ thick oxide air-bridge structure which can be used as a substrate for RF circuits. The structure was fabricated by anodic reaction, complex oxidation and micromachining technology using TMAH etching. High quality films were obtained by combining low temperature thermal oxidation (500 ℃,1 hr at H_2O/O_2) and rapid thermal oxidation (RTO) process (1050 ℃, 2min). This structure is mechanically stable because of thick oxide layer up to 10 ㎛ and is expected to solve the problem of high dielectric loss of silicon substrate in RF region. The properties of the transmission line formed on the oxidized porous silicon (OPS) air-bridge were investigated and compared with those of the transmission line formed on the OPS layers. The insertion loss of coplanar waveguide (CPW) on OPS air-bridge was (about 2 dB) lower than that of CPW on OPS layers. Also, the return loss of CPW on OPS air-bridge was less than about - 20 dB at measured frequency region for 2.2 mm. Therefore, this technology is very promising for extending the use of CMOS circuitry to higher RF frequencies.
성호현,송일규,국정한 한국기술교육대학교 1998 論文集 Vol.5 No.1
In this study, the behavior of a fatigue crack propagation near the expanded hole was investigated in terms of the plastic deformation and position of hole with respect to the propagating crack tip. The results of this study are summarized as follows. 1. The crack propagation rate is high when the crack tip approaches the hole but the retardation effect becomes prolonged when the crack tip is at the very vicinity of the hole. 2. The proper expansion of the hole seemed to play an important role for the retardation of the fatigue crack propagation rate. It is found that 5% of plastic deformation in mild steel show the best effect of the fatigue crack retardation.