http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
강대승(Dae Seung Kang),이민근(M.G.Lee),강기주(Ki-Ju Kang) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Many studies have been conducted for Periodic Cellular Metals(PCMs) to obtain high strength and stiffness for a given weight. To date, a number of structures have been proposed, and they mostly have truss structures such as Pyramid, Octet, Kagome, etc. Recently, Microlattice, a ultra-low density metal(ULDM) composed of hollow trusses was introduced. Microlattice is fabricated based on 3D-lithography technology, which costs very high. In our laboratory, several types of wire-woven structures have been developed as the alternatives of truss PCMs with multiple layers and fine cells. Based on the wire-weaving technology, we introduced a new ultra-low density metal. First, a truss-like structure is assembled using flexible polymer wires. Then, the surface is coated using electroless plating. Finally, the polymer wires are etched out to obtain a hollow tubular structure, micro tube WBK-Q. In this work, we investigate the mechanical properties of the micro tube WBK-Q using FEA
음의 푸아송비를 갖도록 변환된 와이어 직조 Kagome
강대승(Dae Seung Kang),한승철(Seung Chul Han),박종우(Jong Woo Park),Nguyen Dang Ban,강기주(Kiju Kang) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.9
와이어 직조 Kagome는 와이어로 직조된 Periodic Cellular Metal의 일종으로서 Kagome 구조로 이루어져 있다. 와이어 직조 Kagome는 무게 대비 높은 강도와 강성을 가지면서 대량 생산에도 큰 가능성을 가지는 것으로 알려졌다. 본 연구에서는 α-cristobalite 구조적 특성을 모사하여 음의 푸아송비를 갖는 새로운 직조 구조체를 개발하였다. 와이어 직조 Kagome를 제작한 후 사면체 단위셀 부분을 강구와 Epoxy를 이용하여 채우고, 초기 변형을 주어 시편을 제작하였다. 또한 FEA 시뮬레이션을 통해 제작 가능성을 확인하고, 실제 제작한 구조체를 대상으로 기계적 특성을 연구하였다. Wire-woven Kagome is a kind of Periodic Cellular Metal, which is known to have high strength, stiffness for its weight, and potential for mass production. In this work, we developed a new structure that mimics α-cristobalite. First, an ordinary wire-woven Kagome was fabricated using metallic wires, and the tetrahedral cells were then filled with metal balls and epoxy. The wire-woven Kagome was transformed to have a negative Poisson’s ratio by carrying out a specified amount of initial deformation. The fabrication possibility and kinematic behavior were checked by using FEA simulation. Finally, the mechanical properties were measured using compressive tests.
박병흥,강대승,서중석,박성원,Park ByungHeung,Kang Dae-Seung,Seo Chung-Seok,Park Seong-Won Korean Radioactive Waste Society 2005 방사성폐기물학회지 Vol.3 No.2
Isotopes of alkali and alkaline earth metals (AM and AEM) are the main contributors to the heat load and the radiotoxicity of spent fuel (SF) . These components are separated from the SF and dissolved in a molten LiCl in an electrolytic reduction process. A mass transfer model is developed to describe the diffusion behavior of Cs, Sr, and Ba in the SF into the molten salt. The model is an analytical solution of Fick's second law of diffusion for a cylinder which is the shape of a cathode in the electrolytic reduction process. And the model is also applied to depict the concentration profile of the oxygen ion which is produced by the electrolysis of Li$_{2}$O. The regressed diffusion coefficients of the model correlating the experimentally measured data are evaluated to be greater in the order of Ba, Cs, and Sr for the metal ions and the diffusion of the oxygen ion is slower than the metal ions which implies that different mechanisms govern the diffusion of the metal ions and the oxygen ions in a molten LiCl.
박성빈,서중석,강대승,권선길,박성원,Park Sung-Bin,Seo Chung-seok,Kang Dae-Seung,Kwon Seon-Gil,Park Seong-Won Korean Radioactive Waste Society 2005 방사성폐기물학회지 Vol.3 No.2
The electrolytic reduction of uranium oxide in a LiCl-Li$_{2}$O molten salt system has been studied in a 10 g U$_{3}$O$_{8}$ /batch-scale experimental apparatus with an integrated cathode assembly at 650$^{\circ}C$. The integrated cathode assembly consists of an electric conductor, the uranium oxide to be reduced and the membrane for loading the uranium oxide. From the cyclic voltammograms for the LiCl-3 wt$\%$ Li$_{2}$O system and the U$_{3}$O$_{8}$-LiCl-3 wt$\%$ Li$_{2}$O system according to the materials of the membrane in the cathode assembly, the mechanisms of the predominant reduction reactions in the electrolytic reactor cell were to be understood; direct and indirect electrolytic reduction of uranium oxide. Direct and indirect electrolytic reductions have been performed with the integrated cathode assembly. Using the 325-mesh stainless steel screen the uranium oxide failed to be reduced to uranium metal by a direct and indirect electrolytic reduction because of a low current efficiency and with the porous magnesia membrane the uranium oxide was reduced successfully to uranium metal by an indirect electrolytic reduction because of a high current efficiency.
변압기형 초전도 한류기의 고장전류 제한 및 모선전압강하 억제특성 분석
박진설(Jin-Seol Park),강대승(Dae-Seung Kang),임성훈(Sung-Hun Lim) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.1
As one of the countermeasures to solve the increase of the fault current in a power system, the superconducting fault current limiter (SFCL) has been noticed together with the development of a various types of SFCL, which has accelerated the researches to apply a SFCL into a power system. Among the developed SFCLs, the transformer type SFCL is expected to be available for adjusting the voltage and the current ratings of the SFCL. In this paper, the fault current limiting and the bus line's voltage sag suppressing effect by the transformer type SFCL were investigated and the case without the transformer type SFCL was compared as well. Through the analysis on the results of the short-circuit tests, the fault current limiting and the bus-line voltage suppressing characteristics of the transformer type SFCL could be confirmed to be effectively performed.
한순구,강대승 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-
Liquid crystal molecules on a rubbed glass surface are aligned at some polar angle away from the surface. This so-called pretilt angle has a marked influence on the electro-optical properities of liquid crystal cells. We have investigated the high pretilt angle materialization using photo-alignment method. A newly developed the photo-alignment material LPP F 301 CP is used. To measure the pretilt angle in a liquid crystal cell, we utilized the crystal rotation method.