• Korean Journal of Materials Research
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• v.19 no.6
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• pp.300-304
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• 2009

The domain structures of annealed (001)-oriented $Pb(Mg_{1/3}Nb_{2/3})O_3-x%PbTiO_3$ (PMN-x%PT) crystals for x = 10, 20, 30, 35, and 40 at% were investigated by Polarized Optical Microscopy (POM) and Scanning Force Microscopy (SFM) in the piezoresponse mode. Both Polar Nano-Domains (PND) and long strip-like domains were clearly observed. The results also showed how the domain structure changed between phases with an increasing x in the PMN-x%PT crystals and the domain hierarchy on various length scales ranging from 40 nm to 0.1 mm. Distorted pseudo-cubic phase (x < 20%) consisted of PNDs that did not self-assemble into macro-domain plates. The rhombohedral phase (x = 30%) consisted of PNDs that began to self-assemble into colonies along preferred {110} planes. The monoclinic phase (x = 35%) consisted of miniature polar domains on the nm scale, whereas, the tetragonal phase (x = 40%) consisted of {001} oriented lamella domains on the mm scale that had internal nano-scale heterogeneities, which self-assembled into macro-domain plates oriented along {001} the mm scale.

• Journal of Photoscience
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• v.11 no.3
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• pp.121-127
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• 2004

The${\beta}$-glucosidases occur widely in all living organisms and has in general a tendency to form oligomers of varying numbers of subunits or aggregates, although the functional implications of such diverse oligomerization schemes remain unclear. In particular, the assembly mode of the oat ${\beta}$-glucosidase is very unique in that it multimerizes by linear stacking of a hexameric building block to form long fibrillar multimers. Some structural proteins such as actin and tubulin assemble into long fibrils in a helical fashion and several enzymes such as GroEL and Pyrodictium ATPase functional complexes, 20S proteasome of the archaebacterium Thermoplasma acidophilum, and lutamine synthetase fromblue-green algae, assemble into discrete oligomers upto 4 stacked rings to maintain their enzymatic activities. In particular, oat ${\beta}$-glucosidase exists in vivo as a discrete long fibrillar multimer assembly that is a novel structure for enzyme protein. It is assembled by linear stacking of hollow trimeric units. The fibril has a long central tunnel connecting to the outer medium via regularly distributed side fenestrations. The enzyme active sites are located within the central tunnel and multimerization increases enzyme affinity to the substrates and catalytic efficiency of the enzyme. Although it is suggested that oligomerization may contribute to the enzyme stability and catalytic efficiency of ${\beta}$-glycosidases, the functional implications of such diverse oligomerization schemes remain unclear so far.

• Proceedings of the IEEK Conference
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• 2000.06c
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• pp.75-78
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• 2000

SCM(Supply Chain Management) is concerned with the flow of product and information between the supply chain member organizations. Those organizations are suppliers, customers, producers, and service providers. They link together to acquire, purchase, manufacture, assemble, and distribute goods and services from suppliers to users. These flows are bidirectional. There(or is SCM specially important to integrate for efficient management. In this paper, is SCM based on XML(eXtensible Markup Language) studied.

• Ocean and Polar Research
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• v.28 no.2
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• pp.145-151
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• 2006

A broadband self-recording hydrophone was developed to conveniently assemble a hydrophone array for use in receiving underwater sound waves. A trigger device with an electromagnetic induction coupler was also developed to control the hydrophone's operation. Main configurations and specifications of the self-recording hydrophone are introduced in this paper. We present experiment results conducted in a water tank to examine the operating behavior of the hydrophone. Some advantages are discussed when the self-recording hydrophones are used to make up a hydrophone array.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1994.03a
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• pp.218-222
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• 1994

The chassis of T.V, cassette, radio and telephone are made up thin-iron plates that makes a lot of female screws to assemble various parts. Then makes hole in the iron plate and forming female screws of burring face after the burring. Female screws forming in thin-iron plate is very difficult working then rolled forming process use of plastic deformation instead of cut forming. In this study goals are solve the trouble problem of industrial field and develop new model tap for prevent chips.

• Proceedings of the Polymer Society of Korea Conference
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• 2006.10a
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• pp.173-173
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• 2006

We have explored a strategy to control the supramolecular nano-structures self-assembled from rigid segments through attachment of flexible chains through microphase separation and anisotropic arrangement. Supramolecular structures formed by self-assembly of rigid building blocks can be precisely controlled from 1-D layered, 3-D bicontinuous cubic to 2-D cylindrical structures by systematic variation of the type and relative length of the respective blocks. Furthermore, depending on the individual molecular architectures, rigid building blocks self-assemble into a wide range of supramolecular structures such as honeycomb, disk, cylinder, helix, tube, barrel stave, and nano-cage.

• Tunnel and Underground Space
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• v.1
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• pp.32-38
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• 1991

9 nuclear power plants are presently in operation in Korea. They produce radioactive waste of which the most long-lived radioactive elements need to be safely stored for hundreds of thousands of years, isolated from humanity and the environment. The safe disposal of high level radioactive waste in mined cavities requires knowledge of the mechanical. thermal and fluid flow characteristics of rock as perturbed by a thermal pulse The literature review was performed to assemble data on the following properties: modulus tensile strength compressive strength thermal expansion specific heat, thermal conductivity thermal diffusivity and permeability.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.57-57
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• 2000

The purpose of this paper is show that an chip mounter can be modeled by stochastic petri nets, and that the simulator to verify a fitness of the program to assemble. The chip mounter can be constructed by using the petri net class (CPetriNet) based on the object-oriented programming. By using this simulator, we can get the information about the description of motion of the chip mounter, and moreover, we can evaluate the productivity.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10b
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• pp.574-576
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• 2000

본 논문에서는 가상현실을 기반으로 하는 컴퓨터 조립과정 학습 시스템을 구현하였다. 컴퓨터 조립과정을 교육하는데 있어서는 실습이 가장 중요하다. 그러나 기존의 자료들은 과정을 설명한 텍스트나, 2차원 이미지 데이터를 사용하고 있어 그저 보여주는 학습에 그치고 있다. 이런 단점을 보완하기에는 가상현실을 이용한 학습이 가장 좋은 대안일 것이다. 본 논문은 VRML과 EAO를 이용한 Java를 사용하여 시스템을 구현하였다. 이는 학습자들에게 좀더 현실감 있는 교육환경을 제시해 주어서 학습효과를 극대화시킬 수 있다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2007.04a
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• pp.3-4
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• 2007

고분자 반도체를 이용한 유기 박막트랜지스터(OTFT) 소자 제작시 특성 향상을 위해 Self-Assemble Monolayer (SAM)을 이용한 유기 Gate 절연막과 source/drain 전극의 표면처리에 대해 설명하였다. Gate insulator의 경우 소수성 SAM이 고분자 반도체와의 상호작용으로 배열도를 향상시켜 이동도를 증가시켰으며, 전극처리의 경우 접촉저항을 낮추어 injection을 증대시키는 효과를 나타내었다. 각각의 경우 적용되는 SAM 재료와 효과를 극대화시키기 위한 처리공정 전반에 대해 설명하였다.