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Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect
Young‑Seok Oh,Ho Won Lee,Kook‑Chae Chung,Duck‑Young Hwang,Seong‑Hoon Kang,Jeong Whan Yoon 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7
Numerical modeling was conducted to investigate the deformation behavior of powder mixture during multi-pass drawingprocesses for multi-filamentary MgB2wire. A modified Drucker-Prager Cap (DPC) model with an elliptical cap surface usingthe new material characterization method was developed to capture the anisotropic hardening behavior and hydrostatic effectof the powder mixture. A number of uniaxial die compaction, cold isostatic pressing, diametrical compression, and uniaxialcompression tests were conducted using different powder densities to characterize the modified DPC model. A commercialfinite element software ABAQUS with a user subroutine was used to simulate the drawing of the MgB2wire. The densityand area fraction of the powder mixture during the wire-drawing process were verified with experimental results. The differencein packing density at the inner and outer filaments of the MgB2wire was successfully captured by simulation. Inaddition, the effect of the initial packing density on the superconducting properties of MgB2wire was numerically studied. It is shown that the increase in the superconducting area, which results from a high initial packing density, should be moreeffective compared to the increase in the grain connectivity in enhancing the critical current properties for the MgB2wirewhen the final packing density is saturated after a number of drawing processes.
황석순,이헌영,전석구,남계윤,전영준 啓明大學校 醫科大學 1990 계명의대학술지 Vol.9 No.3
Broncholithiasis has been recognized in medicall literature for centuries. Because of the relative infrequency, broncholithiasis has often been neglecteed in the differential deagnosis of bronchial obstruction. In this case, we could remove the broncholith obstructing the right middle lobar bronchus with the fiberoptic bronchoscope in a 37-year old man without any complications and the complete resolution of the pneumonia was followed.
황규동,이창훈,조영돈,김도석 충주대학교 2006 한국교통대학교 논문집 Vol.41 No.-
Pole Placement Control has been well establish in its theory. However, its practice value is yet to be appreciated in most industries. This paper presents an account in which the control strategy is run on the hydraulic motor. Using the input and output data from actual system, estimation of the model parameters are obtained by a function ARMAX(Autoregressive Moving Average with am exogenous signal) in Matlab and controller synthesis is achieved by a Pole placement control. Estimation system from a ARMAX is defined by third order and application of Pole placement control technique will be provide not only stability but also good performance for motion of hydraulic motor in any operation condition.
임대아파트 장기수선 대체안 검토를 위한 CAFM 시스템 개발
정영한,박태근,김광우,김창덕,김옥규,황영삼,박홍석 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
In the case of rental apartment. the special Quality continuously preservation administration business consist and saves up Long-term Maintenance expense voluntarily. Because business surrounding that this can control preservation administration business whole is possible. administration of repair work is easy. Do system development that introduce technique for long-term strategy establishment in CAFM by purpose. Estimation of system to develop is as following: Can reduce time that take in LCC calculation because approach automatically to information of necessary facility in LCC calculation and know repair time as is easy. It is possible that execute selection of item that is examined in long-term maintenance plan as efficient and correct. Priority injection of budget by facility deteriorated degree is consisted preferentially using FCI.
뇌동맥류 파열 환자에서 증후성 뇌혈관연축의 발생 및 회복에 영향을 미치는 인자들
최석민,석종식,권정택,민병국,황성남,김영백,홍현종 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.10
To determine the factors affecting development and recovery of symptomatic vasospasm. the author analysed the results of patients with ruptured intracranial aneurysms treated by nimodipine and prophylactic “triple0H” therapy. From January 1991 to December 1995. 199 patients underwent surgery for ruptured intracerebral aneurysms. Combined hypervolemic hemodilution was initiated at the time of admission. Induced hypertension was added immediately after surgery(aneurysmal neck clipping). All patients received nimodipine intravenously or orally until the 14th day of SAH Sixty patients underwent surgery on Day 0 through 2 after attacks of subarachnoid hemorrhage(Goup A) 105 patients on Day 3 through 14(Group B). and 35 patients after Day 14(Group C). Of 199 patients. 76(38%) patients suffered from symtomatic vasospasm. Symptomatic vasospasm occured in 34% of Group A patients. 33% of Group B patients. and 5% of Group C patients. Symtomatic vasospasm occured more frequently in the older age group. the Fisher group 3 and Hunt & Hess grades 3, 4 and 5 groups. Of 76 patients who suffered from symptomatic vasospasm. 47(62%) patients recovered completely. The author analysed the relationship between recovery rate and sex, age. Hunt & Hess agrde and Fisher group among these 76 patients. Recovery rates between these groups were not significantly different. Based on this experience the author believes that Hunt-Hess grade. Fisher group and age are important factors affecting symptomatic vasospasm development.
崔英淑,金英奭,黃春仙,李瑯雨 대구교육대학교 1972 論文集 Vol.8 No.-
The vocational education in primary level has many things to improve as it has rather a shorter thistory than others. The objectives of vocational education lie in fostering the basic capabilities of living and training the persons required by an industrial society. For an education worthy of its objects, the situations and facilities in primary schools were examined and analysed to solve any problems to be faced in the vocational education.
태권도 프로그램이 정신지체아동의 인지기능 발달에 미치는 영향
허정석,황영성,한성유,이수판,안인준 釜山大學校 附設 體育科學硏究所 2006 體育科學硏究所 論文集 Vol.22 No.1
The purpose of this study was to determine the effect of the Taekwondo program on cognitive competence of children with mental retardation. The subjects were 18 children with mental retardation. The children were devided into two groups. One group(n=9) was in an experimental group and the other group(n=9)was a control group. To find out any changes of their cognitive competence, the Taekwondo program was executed to the exercise group three times a week, for forty minutes a day over ten weeks......
제14회 부산 아시아 경기대회 여자 태권도 경기 공격기술 및 득점 분석
허정석,황영성,박재성,김도호,한성유,이수판 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.2
The purpose of this study was to analyze attack skills and scores in 8 weight classes of female Taekwondo athletes who participated in the semi-final and final matches(48 athletes) in the 14th Asian Games(2002, Busan). The 14th Asian Games was chosen for this study because it is in these games that the rules were revised to a variable scoring system. The results obtained from this analysis were as follows; 1. Korean female athletes: No significant difference was found in attack frequency in the light weight class and the heavy weight class. The attack frequency in the light weight class was shown to be in the following order: momtong-dolryeochagi(217 times), naraechagi(48 times) and dichagi(15 times). The attack frequency in the heavy weight classwas shown to be in the following order: momtong-dolryeochagi(263 times) and tchikeachagi(15 times). 2. Foreign female athletes: No significant difference was found in attack frequency in the light weight class and the heavy weight class. The attack frequency in the light weight class was shown to be in the following order: momtong-dolryeochagi(555 times), naraechagi(32 times) and dichagi(12 times). The attack frequency in the heavy weight class was shown to be in the following order: momtong-dolryeochagi(555 times), tchikeachagi{35 times) and naraechagi(35 times). 3. There is a significant difference in attack frequency in the light weight group of Korean female athletes and foreign female athletes, Between groups, in case of quick body attack, such as momtong-dolryeochagi and naraechagi, the frequency of korean athletes was shown to be higher and scores obtained were higher. In case of high score face attack, such as eolgul-dolryeochagi and tchikki, the frequency of foreign atheletes was shown to be higher 4. There is a significant difference in attack frequency in the heavy weight group of Korean female athletes and foreign female athletes, Between groups, in case of quick body attack, such as momtong-dolryeochagi and naraechagi, the frequency of Korean athletes was shown to be higher and the foreign female athletes' eolgul-dolryeochagi and dwitchagi score rates were shown to be the higher.