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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.
Electrical quadruple hysteresis in Pd-doped vanadium pentoxide nanowires due to water adsorption
Kim, Byung Hoon,Oh, Soon-Young,Yu, Han Young,Hong, Won G,Yun, Yong Ju,Kim, Yark Yeon,Kim, Hae Jin Elsevier 2010 SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS Vol.11 No.6
<P>Humidity-dependent current–voltage (<I>I–V</I>) characteristics of Pd-doped vanadium pentoxide nanowires (Pd-VONs) were investigated. Electrical quadruple hysteresis (QH) was observed and attributed to the large amount of water molecules adsorbed on the nanowires. Using QH in Pd-VONs, the reaction of water with PdO was interpreted as the water molecules are desorbed and then dissociated with increasing bias voltage. Owing to the dissociated H<SUP>+</SUP> and OH<SUP>−</SUP> ions, PdO is reduced and oxidized. As a result, water molecules recombine as the bias voltage is decreased.</P>
이훈재,류명춘,오주환 경운대학교 산업기술연구소 1998 産業技術硏究論文誌 Vol.1 No.1(A)
In this paper we propose a secure T1-rate digital image conference system which consists a stream cipher of 7-bit real adder with 2 bit carrys and a fast and stable 2-step full-duplex synchronization. And we analyze the cipher algorithm and the synchronization performance of the system.
정경훈,최형일,정오진,정재경,강성환,조영찬 조선대학교 환경공해연구소 1998 環境公害硏究 Vol.14 No.-
The Water quality for river surrounding closed coal mine in Hwasun area Chunnam was investigated. The investigated factors were pH, turbidity, conductivity, Fe, SO_(4)^(-2), Ca, and Mg concentration, and the crystallization form and components of suspended solids were also investigated by scanning electron microscope and energy dispersion system Extremely high value of turbidity and conductivity were represented in Honam Kwangup (N-7) and Honam Tanza (N-3)area, respectively. Fe concentration was lower in all sampling sites, and the concentration of SO_(4)^(-2) ion was higher than 200mg/L in all sampling sites excepting Dongyang Tanggwang area (N-2) and Hwail wetland (N-11). The SEM micrograph and EDS analysis showed that the crystallization form of the suspended solids was formless, These particles have size of less than 10??and the main components was O, Al, Fe and S. The corelation values between conductivity and Mg, SO_(4)^(-2), and Ca were 0.967, 0.959, 0.931, respectively, and the results indicate good corelation.
이훈재,오주환 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(B)
Public-key cryptosystems carry out the modular exponentiation of large integer for security, and modular exponentiation is presented by the serial of the modular multiplication. This thesis presents the classical multiplication method, Montgomery algorithm, Yang algorithm to implement high-speed multiplication above 512-bit.]
정경훈,최형일,정오진,정재경,강성환,조영찬 조선대학교 환경연구소 1998 環境硏究 Vol.14 No.1
The Water quality for river surrounding closed coal mine in Hwasun area Chunnam was investigated. The investigated factors were pH, turbidity, conductivity, Fe, SO_^-2, Ca, and Mg concentration, and the crystallization form and components of suspended solids were also investigated by scanning electron microscope and energy dispersion system. Extremely high value of turbidity and conductivity were represented in Honam Kwangup (N-7) and Honam Tanza (N-3)area, respectively. Fe concentration was lower in all sampling sites, and the concentration of SO_4^-2 ion was higher than 200㎎/L in all sampling sites excepting Dongyang Tanggwang area (N-2) and Hwail wetland (N-11). The SEM micrograph and EDS analysis showed that the crystallization form of the suspended solids was formless, These particles have size of less than 10㎛ and the main components was O, Al, Fe and S. The corelation values between conductivity and Mg, SO_4^-2, and Ca were 0.967, 0.959, 0.931, respectively, and the results indicate good corelation.
윤정오,이훈재,홍영호,최병진 경운대학교 산업기술연구소 1998 産業技術硏究論文誌 Vol.1 No.1(A)
In this paper, we suggest a new encryption system for high speed permutation image processing. We show how to secure attack relative to redundancy in image data. In addition, by applying the proposed permutation algorithm in image data, we show how to solve problems related to scanning sequence and scraming.
웹 서버상에서 PHP 스크립트 언어를 이용한 회원관리 시스템 구현
이훈재,오주환 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(C)
많은 사람들은 자신들의 필요나 호기심에 의하여 직접 게시판이나 대화방과 같은 회원관리 프로그램을 만들고 싶어하며 기존의 C나 Perl을 대신하여 PHP라는 간단한 스크립트 언어로 이를 실현할 수 있게 되었다. 본 연구에서는 PHP 스크립트 언어를 이용하여 웹 서버상에서 회원관리가 가능한 사용자 로그인 및 쪽지 보내기 기능을 갖는 회원관리 시스템을 구현하였다. 구현된 시스템은 PHP를 구동시키는 리눅스 OS를 실제 서버로 사용하였다. 본 연구에서는 이전까지 일반인들의 접근이 힘든 스크립트 언어가 얼마나 대중성을 갖게 될 것인지 간단히 구현해 보는데 큰 의미를 두고 있다.
정경훈,최형일,정오진,최칠남,정재경 한국환경과학회 2000 한국환경과학회지 Vol.9 No.1
Laboratory experiments were performed to investigate the effects of various factors on the phosphorus removal by electrolysis with aluminium electrodes. The efficiency of phosphorus removal increased with increasing of voltage applied, surface area of electrodes and electrolyte concentration, and decreasing of electrode distance. The phosphorus removal was not affected by the connection number of an electric circuit. The amount of aluminium ion eluted from electrodes according to Faraday's law was 4.47 ㎎ and the Al/P mole ratio was 2.14 at the electric current value of 20 ㎃.