• Korean Journal of Pharmacognosy
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• v.39 no.4
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• pp.365-368
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• 2008

Recently proteasome inhibitors have been emerged as potential anticancer agents. In a continuous study on exploring proteasome inhibitors from natural products, fruiting body of Hericium erinaceum was investigated. The MeOH extracts of the fruiting body of Hericium erinaceum was fractionated with several solvents and the fractions were evaluated on the activity to screen the proteasome inhibitors. The n-Hexane and CHCl3 frs. showed potent activity, of which chemical investigations led to ergosterol peroxide (1), hericenones C (2) and D (3). Their structures were determined by spectroscopic methods such as $^1H$-NMR, $^{13}C$-NMR, and FABMS spectra.

• Microbiology and Biotechnology Letters
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• v.28 no.6
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• pp.322-328
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• 2000

To screen agent for the treat-ment of Alzhimers Disease several strains of bacteria producing acetylcholinesterase inhibitor ware isolated from soil. Strain 960903 showed strong acetylcholinesteras inhibitory activity and low butyrylcholinesterse inhibitory activity. The strain 960903 was identified as Pseudomonas sp. Acetylcholinesterase inhibitor ws highly achieved in fermentation medium containing soluble starch 3.0%, glycerol 1.0%, pharmamedia 0.5%, KCI 0.3%, $CaCO_3$ 0.2%, MgS $O_4$..$7H_2$O 0.05%, $KH_2$$PO_4$ 0.05%(pH6.5) at $30^{\circ}C$ for 4 days. Acetylcholinesterase inhibitor was purified by Diaion WA-30($OH^{-}$) column charomatography and cellulose column chromatography. Acetylcholinesterase inhibi-tor showd the maximum wavelength at 205 nm and was soluble in water, acetic acid, ethanol, methanol and dime-thyl sulfoxide. The concentration of 50% inhibition($IC_{50}$) of inhibitor against acetylcholinesterase was 25$\mu\textrm{g}$/ml. The inhibitor was inactivated on heating ar $100^{\circ}C$ fro 15 min and more stable in acidic region than alkaline region.n.

• Journal of Korean Library and Information Science Society
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• v.30 no.4
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• pp.327-350
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• 1999

This study tries to analyze the problems of rules for cataloging currently used n Korea such as KCR 3rd ed., KORMARC Description Rules, and KORMARC format, and to propose the methods solving the non-standardization of Korean cataloging records as follows: 1) No-main heading principles should be established so as to be applied to MARC format. 2) Description rules of cataloging currently used in Korea should be coordinated in accordance with MARC system and principles of bibliographical description. 3) Description rules of cataloging currently used in Korea should be coordinated in accordance with MARC system and principles of bibliographical description. 4) Unifying the format for CRT screen to display online catalog records are needed. 5) Conventional cataloging rules and MARC format should be coordinated.

• Journal of the Korean Graphic Arts Communication Society
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• v.15 no.2
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• pp.117-130
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• 1997

Studies have been conducted to explore thermal imidization of polyamic acid. Aromatic polyimides are well recognized as high temperature linear polymers, and polyimide are used as structural materials, fibers, and adhesive. Two different kinds of polyimide were prepared by theimidization of polyamic acid which were synthesized from 2,2-bis[4-(4-aminophenoxy)phenyl]- hexafluoropropane, 2,2-bis [4-(4-aminophenxy)phenyl] - hexamethylpropane and caprolactam and pyromelliti dianhydride under N-Methly-pyrrolidinone solvent. Polyamic acids were converted to polyimides containing imide bond by thermal imidization. The weight 50% loss temperatures of polyimide by TGA thermogram were recorded in the range of 700 ~ 720$^{\circ}$C in nitrogen gas. According, as a results, we conclued polyamic acid were cycliation after H2O molecule separationed, and this polyimide film could be used for Printed Circuit Boand.

• Journal of Biomedical Engineering Research
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• v.9 no.2
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• pp.153-158
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• 1988

A three-dimensional surface is reconstructed from contour information as identified on two-dimensional computed tomographic slices. Gradient operator with curvature constraint would be applied to extract the contour automatically, and backtracking is also adopted to reduce the tracking error. The surface between the consecutive slice is efficiently reconstructed using a triangular surface tiles. Hidden surface elimination, shading and parallel projection of the reconstructed surface are provied on the display screen.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.263-265
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• 2011

본 연구에서는 터치 스크린을 사용하는 스마트폰에서 보다 편리하고 효율적으로 한글을 입력할 수 있는 방식에 대하여 제안하고자 한다. 기존의 2벌식 자판은 화면의 크기가 제한적인 모바일 환경에 적합하지 않으며, 터치스크린 방식은 미세한 접촉으로도 글자가 입력되기 때문에 사용자가 의도하지 않은 오/탈자가 빈번하게 발생한다. 본 연구에서 제시하는 입력 방식은 한글의 제자원리를 이용하여 자음 입력 후에 스케치를 통해 모음 입력을 부드럽게 이어가는 방식을 제안한다. 제안 연구는 사용자가 제한된 화면 영역을 효율적으로 사용하여 향상된 속도로 한글을 입력할 수 있게 도와주고, 원하지 않는 오/탈자의 발생빈도를 줄이는 효과를 가지고 있다.

• International Journal of Internet, Broadcasting and Communication
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• v.10 no.4
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• pp.19-24
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• 2018

Recently, people can create small content by themselves and it improved into a form that can be promoted. Also, as active small business owners increase, they produce the content for promotion by themselves without external professional help and they utilize it. This paper studies the method to make Mobile Apps, Mobile Web and homepage services available by automatically generating the mobile based mini content. The automated content creation system suggests the method that small business owners and groups can easily communicate with new people by bringing Single Page Application, hybrid mobile web app, N-Screen based content building, private cloud-based PaaS building technology, P2P network based file sharing and multimedia thread technologies together and creating the content.

• Information and Communications Magazine
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• v.28 no.10
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• pp.44-49
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• 2011

최근 몇 년간 웹의 확산을 통해 기존 IT 환경에 많은 변화를 가져왔으며, 최근에는 스마트폰 열풍이 또 한번의 새로운 큰 변화를 만들고 있다. 이러한 변화의 중심에는 웹과 모바일의 결합을 통한 새로운 시너지 효과가 클라우드 컴퓨팅으로 그 영향을 미치고 있다. 예상보다 너무 빠른 클라우드로의 이동은 기존 비즈니스를 파괴적으로 변화시키고 있을뿐 만 아니라 모바일 클라우드를 통한 서비스 경쟁을 과열시키는 양상까지 초래하고 있다. 모바일 클라우드는 클라우드 컴퓨팅의 편리성과 확장성을 기반으로 다양한 디바이스에 플랫폼 및 운영체제 비종속적인 개방환경의 N-Screen 지향성의 모바일 클라우드 컴퓨팅 환경 제공하는 것으로 기존의 클라우드 서비스가 모바일 단말에 심리스하게 서비스제공, 모바일 단말의 자원을 연계하여 클라우드 서비스 제공하는 등의 특성을 가지고 있다. 본 고에서는 모바일 클라우드 서비스의 개요 분류체계, 그리고 관련 표준화 동향을 살펴보도록 한다.

• Journal of the Korean Ceramic Society
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• v.27 no.7
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• pp.841-850
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• 1990

The electrical conductivity of SrTiO3 thick films, which has been prepared by screen printing and sintering on polycrystalline Al2O3 substrates, was determined as a function of oxygen partial pressure and temperature. The data showed that electrical conductivity was proportional to the -1/4th power of the oxygen partial pressure for the oxygen partial pressure range from 10-4-10-8 to 10-20 atm and proportional to Po2+1/4 for the oxygen partial pressure range from 10-6-10-4 to 1atm. And then n-p transition region of electrical conductivity moved to lower oxygen partial pressure region as the sintering temperature of thick film specimens increased under about 140$0^{\circ}C$. These data were consistent with the presence of small amounts of acceptor impurities in SrTiO3 thick film which have been diffused from Al2O3 substrate in the range of solid solubility limit.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.12 no.5
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• pp.30-35
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• 2013

In order to increase cell efficiency in crystalline silicon solar cell, reduction of light reflection is one of the essential problem. Until now silicon wafer was textured by wet etching process which has random patterns along crystal orientation. In this study, high aspect ratio patterns are manufactured by nano imprint process and reflectance could be minimized under 1%. After that, screen printed solar cell was fabricated on the textured wafer and I-V characteristics was measured by solar simulator. Consequently cell efficiency of solar cell fabricated using the wafer textured by nano imprint process increased 1.15% than reference solar cell textured by wet etching. Internal quantum efficiency was increased in the range of IR wave length but decreased in the UV wavelength. In spite of improved result, optimization between nano imprinted pattern and solar cell process should be followed.