Channe形 構造用材에 對한 純粹剪斷 Rolling 加工法의 應用

盧泰瑛 釜山工業大學校 1981 論文集 Vol.22 No.1

A new shear rolling method for deformation of metals was utilized to manufacture the channel-shaped beam structure. The process is very similar to shear of cones and instead of rotating mandrel, the reciprocating die is used to this process. Commercially pure alluminium blank was tested to demonstrate the process. Tangential force was measured by using tool dynamometer and was compared with theoretical solution based on simple shear deformetion. Good qualtative agreement exists between theory and experiments.

Olympic體操競技의 링 規定演技 變遷에 관한 硏究

노영태 釜山大學校 附設 體育科學硏究所 1992 體育科學硏究所 論文集 Vol.8 No.-

The purpose of this study was analyzed regarding rings compulsory exercise during 68 years from the 9th Amsterdam Olympic Game to the 26th Atlanta Olympic Games as follow: 1. Swings through the hang stemme, kips, and upward swing and dislocate of the hang stemme skills were utilized in competition in Olympic Games. Also, 45 degree was required when rearward swings through the hang stemme and unbending arm practice was emphasized in the Olympic Games. 2. Since the 15th Olympic Game, back kip was not utilized any more. Upward swing and dislocate skill was developed to felo upward swing and dislocate and handspring. It was important skill to learn controling not only power but also unstable rings and body. 3. The earlier stage, low shoulder height was utilized when in locate stretched and dislocate backward stretched performed and rings height was control to higher than shoulder. 4. Press to handstand with straight body and bent arms among press to handstand was utilized the most frequently in Olympic Games. Free support scale, hanging scale front ways, hanging scale rearways, and cross were selected as compulsory exercise in the Olympic Games. Press to handstand, free support scale, and cross were as compulsory exercise as well as free skill, so it was emphasized in practice situation. 5. The rate of executed with strength and executed with swing were 58.1% vs 41.9% before 1956. The rate of executed with strength and executed with swing were 50% vs 50% from 1960 to 1964. The rate of executed with strength and executed with swing were 45.6% vs 54.4% from 1970 to 1980. The rate of executed with strength and executed with swing will be 50% to 50% in the 26th Atlanta Olympic Games. 6. Salto backward was more frequently utilized in the Olympic Game than salto forward among dismounts. However, rings compulsory exercise required more precise skill and skilled skill were required in the Olympic Games. Therefore, researchers emphasized salto forward and turn skill in practice situation.

'85 Chunichi Cup 國際選拔 體操競技 鐵棒演技 分析

魯永泰 釜山大學校 附設 體育科學硏究所 1986 體育科學硏究所 論文集 Vol.2 No.-

The purpose of this study was to analyze the horizontal bar performance of 1985 Chunichi Cup Gymnastics Competition (NOV. 23-24, 1985, Japan). The analyses of performance were concluded as follows. 1. In composition of difficalty, the ratio of composition of C and D difficalty performed by high score contestants exceeded more than 50%. 2. In the value scores of performance, Tong (CHN) scored 35 points, as the highest score, while Ju (KOR) 23 points as the lowest. Tippelt (GDR) scored 97.73% as the highest points and Ju (KOR) 75.00% as the lowest in the degree of accomplishment in the horizontal bar. 3. Yang (CHN) scored the highest with C-D and C-D-C series in direct series performance of C and D difficulty, while Tippelt( GDR) and Ju (KOR)did not included the direct series in C and D difficalty. 4. The high tendency of choice of difficulty was shown in series performance of C and D difficulty. Henceafrer, the determination of good scores in horizontal bar performance is supposed to mainly depend on the techniques of next movement followed by the one arm giant circle. 5. Techniques which gymnasts grasp a horizontal bar after releasing both hands were performed with C and D difficulty. 6. In dismounting from a horizontal bar, 2 gymnasts performed C difficulty and 6 gymnasts D difficulty. So the magnificence of horizontal bar performance was emphasized.

水素 除去을 위한 熔接後 熱處理에 관한 硏究

盧泰瑛 釜山工業大學校 1995 論文集 Vol.37 No.-

Finite element techniques are applied to real weld shapes to derive hydrogen concentration curves. Results form the basis for an evaluation of post weld heat treatment in terms of hydrogen dispersal from welds. It is found that any chosen level can be reached after welding by maintaining postheat for a period which may be calculated from the finite element results. and welds requiring stress relief heat treatment will incur some risk of cracking if allowed to cool to ambient between completion of welding and application of the heat treatment. The mandatory stress relief heat treatments are sufficient to lower hydrogen concentrations to less than 10% of that present initially.

Olympic 鐵棒 規定演技 變遷에 關한 硏究

魯永泰 釜山大學校 附設 體育科學硏究所 1990 體育科學硏究所 論文集 Vol.6 No.-

During 64 years from the 9th Amsterdam Olympic in 1928 to the 25th Barsellona Olympic in 1990, the results of analysis to horizontal bar compulsory exercise in Olympic were as follows. 1. Reverse grip is linked with shaking hand stand, one arm in reverse almost with ordinary grip making a 1/2turn, ordinary grip with one arm in revers. The holding method of grip has appeared to change every Olympic since the 17th Olympic. 2. Kip is needed diverse excercise as a pushing hand stand displaying a ordinary or reverse kip, hand stand, a progressing 1/2turn. 3. Giant forward swing and giant backward swing are put into practice 43times (thus, the average is used 2.9 times). As soon as making 1/1turn as a swing without a extra swing and directly is structured to link next excercise. 4. As stoop circle rearways forward and elgrip back uprise is continued to use from the 22th Olympic, in future Olympic, a elgrip giant swing action is also expected to include. 5. Straddle circle forward and backward or stoop circle forward and backward are a basic stage to end. Straddle and stalder techniques. Therefore, it appeared that the former are not used form after the 22th Olympic, the latter being continuously used from the 23th Olympic will be continued to use in Olympic conpulsory excercise infurture. 6. Dismouts will be used among hecht or straddle hecht to dismount, salto backward stretched with 1/1turn dismount, salto forward stretched with 1/2turn dismount, and double backward somersault tucked dismount.

오스테나이트계 304 스테인레스강과 Nd-YAG 레이저빔과의 상호작용

유영태,오용석,노경보,임인호 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.1

Laser beam welding is increasingly being used in welding of structural steels. The laser welding process is one of the most advanced manufacturing technologies owing to its high speed and penetration. The thermal cycles associated with laser welding are generally much faster than those involved in conventional arc welding processes, leading to a rather small weld zone. The experiments are performed for 304 stainless steel plate applying variation of : laser power(600~2000W), welding speed (3~10m/min), shielding gas flow rate, presence of surface pollution, with fixed or variable gap and misalignment between the similar and dissimilar and plates, etc. The variation of brightness temperature versus modification of operational parameters is found, certain typical welding defects can be detected.

^161, ^163Dy의 0.003eV~50keV의 중성자 포획 단면적 측정

민영기,윤정란,노태익,김귀년,이삼열 東亞大學校附設基礎科學硏究所 2002 基礎科學硏究論文集 Vol.19 No.1

교토대학 원자로 연구소의 46MeV 전자선형가속기를 사용하여 중성자 TOF 방법으로, 에너지 영역 0.003eV∼50keV의 ^161, 163Dy sample의 중성자 포획 단면적을 측정하였다. 본 실험에서 사용된 Bi_4Ge_3O_12(BGO) 섬광 검출기는 sample의 핵반응에서 나오는 즉발 포획 감마선 측정에 사용하였다. 이 검출기는 중성자 선원으로부터 거리 12.7±0.02m 위치에 12개의 블록으로 되어 있으며, sample에 포획되는 중성자 flux의 절대치를 구하기 위해 Sm(n, γ) 및 ^10B(n, αγ) 반응을 이용하였다. ^161, 163Dy에 대한 포획 단면적 측정결과는 ENDF/B-VI 결과와 비교하였다. The neutron capture cross sections of ^161, 162Dy has been measured in the energy region from 0.003eV 50keV by using the neutron time-of-flight(TOF) promptγmethod with a 46MeV electron linear accelerator at the Research Reactor Institute, Kyoto University. An assemble of twelve pieces of BGO scintillation detectors, which was placed at a distance of 12.7±0.02mm from the neutron source, was employed as a total energy absorption detector for the prompt capture gamma-ray measurement, to obtain the absolute capture cross section value. The sample of ^161, 163Dy is a form of metallic plate. An enriched boron sample was employed to monitor the neutron flux/spectrum of the TOF beam using the standard reference cross section of the ^10B(n, αγ) reaction. Previous measurements and evaluated data in ENDF/B-VI was compared with the present results.

오스테나이트계 304 스테인레스강의 Nd:YAG 레이저 초점크기와 용접특성

유영태,오용석,노경보 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2

Laser beam welding is increasingly being used in welding of structural steels. The laser welding process is one of the most advanced manufacturing technologies owing to its high speed and penetration. The thermal cycles associated with laser welding are generally much faster than those involved in conventional arc welding processes, leading to a rather small weld zone. The experiments are performed for 304 stainless steel plate applying variation of : laser power(1500~2000W), welding speed (3~5m/min), shielding gas flow rate, presence of surface pollution, with fixed or variable gap and misalignment between the similar and dissimilar and plates, etc. The follow conclusions can be drawen that unlikely laser power, welding speed has a pronounced effect on size and shape of the fusion zone. Increase in welding speed resulted inan increase in weld depth/ welding ratio and hence a decrease in the fusion zone size. The penetration depth increased with the increase in laser power.

오스테나이트계 스테인리스강과 SM45C의 연속파형 Nd:YAG 레이저 용접특성비교

유영태,오용석,노경보,임기건 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.3

Welding characteristics of austienite 304 stainless steel and SM45C using a continuous wave Nd:YAG laser are experimentally investigated. Laser beam welding is increasingly being used in welding of structural steels. The laser welding process is one of the most advanced manufacturing technologies owing to its high speed and deep penetration. The thermal cycles associated with laser welding are generally much faster than those involved in conventional welding processes, leading to a rather small weld zone. Experiments are performed for 304 stainless steel plates changing several process parameter such as laser power, welding speed, shielding gas flow rate, presence of surface pollution, with fixed or variable gap and misalignment between the similar and dissimilar and plates, etc. The Nd:YAG laser welding process is one of the most advanced manufacturing technologies owing to its high speed and penetration. This paper describes the weld ability of SM45C carbon steel for machine structural use by Nd:YAG laser. The follow conclusions can be drawn that laser power and welding speed have a pronounced effect on size and shape of the fusion zone. Increase in welding speed resulted in an increase in weld depth/aspect ratio and hence a decrease in the fusion zone size. The penetration depth increased with the increase in laser power.

비전형적인 임상양상을 보인 에크린 혈관종성 과오종 1예

이태호,노영석 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.2

Eccrine angiomatous hamartoma (EAH) is a rare benign cutaneous lesion. EAH is usually a single, aymptomatic lesion that appears as a nodule or plaque on the extremities, mainly the legs. Hyperhidrosis and/or pain may be present. Histologically, it is characterized by the proliferation of well-differentiated eccrine glands, in close association with well-differentiated, this-walled venules and capillaries in the dermis to the subcutis. We report a case of EAH showing atypical clinical appearance of fat hlrnia on the both heels in a 50-year-old female patien.