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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.
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.
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.
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......
김영권 ; 황석연 김천대학교 2002 김천대학교 논문집 Vol.23 No.-
Habitative microorganism were isolated from the floated air and surface of record materials of library with ancient archives.
안영주,황영문,오석규 釜山大學校生産技術硏究所 1995 生産技術硏究所論文集 Vol.49 No.-
회전기기의 설계에 있어서 전기자에서 온도 상승의 계산은 가장 중요한 문제의 하나로 인식되어 왔다. 제시된 많은 온도상승 계산방법에도 불구하고 실제 설계에 사용되는 예는 드물다. 대부분의 경우 이들 방법은 기기의 복잡한 내부 구조 때문에 넓은 범위의 온도 분포를 측정하기에 부적절하다. 본 논문에서, 전기자를 7부분으로 나누어 열 등가회로를 구성하여 시뮬레이션 하였다. 실험은 열전대를 설치한 돌극형 동기발전기로 행하였다. 시뮬레이션 결과 실제 측정한 온도분포와 잘 부합됨을 알 수 있었다. The calculations of the temperature rise in the armature have long been considered among some of the most important problems in the design of the rotating machine. Despite the many methods of calculation of temperature rise proposed, very few have been used in the actual design. In most cases, these methods are inadequate for measuring a wide range of temperature distribution because of the complicated structure of the machine. In this paper, the armature is divided into seven portions, and the thermal equivalent circuit is introduced as a simulation of the armature. The experiment is performed on the salient-pole type synchronous generator with he armature in which the thermocouples were installed. The simulation results are verified by estimated temperature distribution.
고속 채널환경에 강건한 OFDM 시스템을 위한 채널추정기법
강연석,황태욱,최준철,김영수 경희-다반 ASIC 설계교육센터 2004 경희-다반 ASIC센터 논문집 Vol.5 No.-
본 논문에서는 Orhogonal Frequency Division Multiplexting(OFMB) 시스템의 성능 향상을 위해 파일럿 심볼을 이용한 향상된 채널추정 알고리즘을 제안한다 기존의 LMMSE 알고리즘을 이용한 채널 추정 방법은 파일럿 심볼만을 채널 추정에 이용함으로써 파일럿 간격이 멀어짐에 따라 성능이 현저하게 떨어지는 단점이 있다. 이런 문제를 해결하기 위해 파일럿 사이의 채널을 선 추정하고 이 추정된 값을 다시 파일럿과 함께 이용하여 채널을 추정하는 채널추정기법을 제안하였다. 제안된 추정기법은 도플러 주파수를 36Hz애서 185Hz인 페이딩 채널환경에 적용했다. 기존의 LMMSE 추정기법과 비교했을 때 특히 큰 도플러 주파수애 대해 강건한 특성을 보였다.
秋永守,黃昌奭 홍익대학교 산업기술연구소 1998 産業技術 Vol.8 No.-
The results were summarized as follows (A study on the Regulation for Maintenance Repair and Preservation of the Building equipments) The life of building equipment which take charge of essential capacity to supply a building with lighting water service and air conditioning, is short compare with building life, so it have to enforced appropriately repair and preservation according to the contents year of building equipment. This study announce regulation model using a chart in analysis of a factor take changed because must distinguish with accuracy decision of the object of inspection in building equipment, items of contents and a cycle.