• Title, Summary, Keyword: w-linked

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Module-theoretic Characterizations of Strongly t-linked Extensions

  • Kim, Hwankoo;Kwon, Tae In
    • Kyungpook Mathematical Journal
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    • v.53 no.1
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    • pp.25-35
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    • 2013
  • In this paper, we introduce and study the concept of "strongly $t$-linked extensions", which is a stronger version of $t$-linked extensions of integral domains. We show that for an extension of Pr$\ddot{u}$fer $v$-multiplication domains, this concept is equivalent to that of "$w$-faithfully flat".

Immobilization of Polysiloxane Liquid Phase on the Gas Chromatographic Solid Supports via In-Situ Cross-Linking

  • Kim, Kyoung-Rae;Zlatkis, Albert
    • Bulletin of the Korean Chemical Society
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    • v.8 no.3
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    • pp.133-137
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    • 1987
  • Polysiloxane SE-54 liquid phase was immobilized on the support surface as coated in thin film via in-situ cross-linking. The cross-linking between liquid molecules was initiated by dicumylperoxide. Among the supports investigated, only Chromosorb W provided the cross-linkable surface. The optimal in-situ cross-linking was achieved when Chromosorb W was coated with 5% (w/w) SE-54 and cross-linked with 1% (w/w) dicumylperoxide. The cross-linked support was useful for the trace analysis as well as for the trace enrichment.

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Volume Resistivity Properties of Cross-linked Polyethylene for Ultra-high Voltage Cable (초고압 케이블용 가교폴리에틸렌의 체적고유저항특성)

  • JEONG, J.;KIM, W.J.;LEE, K.W.;LEE, S.W.;PARK, H.Y.;KIM, W.K.;HONG, J.W.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.455-458
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    • 2002
  • In this paper, the physical and volume resistivity properties of cross-linked polyethylene (XLPE) for ultra-high voltage investigated due to temperature dependence, and the measurement of volume resistivity used to highmegohm meter is measured from 1 to 30 minutes when the each applied voltage, for example, DC 100[V], 250[V], 500[V] and 1000[V] is applied, according to the step voltage application method. From FT-IR spectrum as an analysis of physical properties, a strong absorption in wavenumbers 700 to 730[$cm^{-1}$ /], 1456[$cm^{-1}$ /] and 2700 to 3000 [$cm^{-1}$ /] observed by the methyl groups(CH$_2$). From the analysis of DSC, the crystalline melting points of the specimen observed in the temperature 60[$^{\circ}C$] and 106.58[$^{\circ}C$].

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Analyzing Current State of Library Linked Data, Designing an Integrated LLD, and Thoughts on Ways to Expand LLD (도서관 링크데이터(Library Linked Data) 현황분석과 통합 LLD 설계 및 확산방향에 대한 고찰)

  • Oh, Sam-Gyun;Kim, Seong-Hun;Jang, Won-Hong
    • Journal of Korean Library and Information Science Society
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    • v.42 no.4
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    • pp.331-351
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    • 2011
  • This paper analyzes the activities and recommendations of W3C LLD Incubator group and investigates the benefits of Library Link Data through case studies. It also discusses the necessary global identification systems for developing useful LLD as well as the problems associated with linking available vocabularies with existing data sets. Ways to apply RDF, SKOS, Microformats, and RDFa to LLD are presented. the many challenges related to establishing LLD-based information services and the various barriers that prevent libraries from accepting LLD are also identified. Finally this paper presents a new LLD-based digital information system and provides some recommendations on how to promote and expand LLD in Korea.

Spine Information Search Service using Linked Data (링크드 데이터를 활용한 척추정보 검색 서비스)

  • Seo, Dong-Min;Lee, Seungwoo;Lee, Sang-Ho;Jung, Hanmin;Sung, Won-Kyung
    • Proceedings of the Korea Contents Association Conference
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    • pp.73-74
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    • 2013
  • 차세대 웹 기술인 시맨틱 웹(Semantic Web)이 각광을 받음에 따라, 시맨틱 웹과 관련된 다양한 기술들이 활발히 연구되고 있다. 특히, 시맨틱 웹의 핵심 사례인 링크드 데이터(Linked Data)는 웹으로 접근 가능한 형태의 URI로 시맨틱 데이터를 표현하고 서로 연결함으로써, 오픈 데이터로서 상호운용성 극대화 및 데이터의 통합을 용이하게 한다. 이는 바이오인포매틱스 기술 발전과 결합하여 웹에서 바로 이용 가능한 많은 의학 링크드 데이터 생산과 이를 활용한 다양한 의학용어 검색 서비스 개발 결과를 가져왔다. 하지만, 기존 의학용어 검색 서비스들은 각 기관이 보유하고 있는 의학정보를 기반으로 서비스되기 때문에 다양하고 정확한 정보를 얻기 위해서는 많은 시간과 노력을 투자해야 한다. 그래서 본 논문에서는 척추 분야 의학 관련 링크드 데이터를 활용해 정확도가 높고 확장이 용이한 척추정보 검색 서비스를 제안한다.

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ON w-COPURE FLAT MODULES AND DIMENSION

  • Bouba, El Mehdi;Kim, Hwankoo;Tamekkante, Mohammed
    • Bulletin of the Korean Mathematical Society
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    • v.57 no.3
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    • pp.763-780
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    • 2020
  • Let R be a commutative ring. An R-module M is said to be w-flat if Tor R1 (M, N) is GV -torsion for any R-module N. It is known that every flat module is w-flat, but the converse is not true in general. The w-flat dimension of a module is defined in terms of w-flat resolutions. In this paper, we study the w-flat dimension of an injective w-module. To do so, we introduce and study the so-called w-copure (resp., strongly w-copure) flat modules and the w-copure flat dimensions for modules and rings. The relations between the introduced dimensions and other (classical) homological dimensions are discussed. We also study change of rings theorems for the w-copure flat dimension in various contexts. Finally some illustrative examples regarding the introduced concepts are given.

Estimation on the Insulation Properties of Cross-linked Polyethylene by the Dielectric Experimental methods (유전실험법에의한 가교폴리에틸렌의 절연특성평가)

  • Jeong, J.;Kim, W.J.;Byun, D.G.;Lee, S.W.;Park, H.Y.;Hong, J.W.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.228-231
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    • 2002
  • In this paper, we estimated the insulation properties of cross-linked polyethylene (XLPE) for ultra-high voltage cable. we have studied the dielectric characteristics of XLPE due to frequency and temperature variation. The dielectric characteristics were measured in the temperature range from $25[^{\circ}C]$ to $120[{^{\circ}C]}$. Also we measured in the voltage range of 1[V] to 20[V] according to the step voltage application method. From FT-IR spectrum as an analysis of physical properties, a strong absorption in wavenumbers 700 to $730[cm^{-1}]$, $1456[cm^{-1}]$ and 2700 to $3000[cm^{-1}]$ observed by the methyl groups$(CH_{2})$. From the analysis of DSC, the crystalline melting points of the specimen observed in the temperature $60[^{\circ}C]$ and $106.58[^{\circ}C]$.

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An Alternative Zero Voltage Switching Method of Boost Rectifier in Power Factor Correction Rectifier/Regulator System using DC Linked Energy Feedback Circuit

  • Roh, Chung-Wook;Kim, Bok-Man;Moon, Gun-Woo;Youn, Myung-Joong
    • Proceedings of the KIPE Conference
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    • pp.270-275
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    • 1998
  • A new single phase power factor correction rectifier/regulator with dc linked energy feedback circuit is proposed, which is capable of achieving the zero voltage switching (ZVS) of a boost rectifier stage without any auxiliary switch. The performance of the proposed rectifier/regulator is demonstrated through a 200W, 90 KHz prototype. This proposed rectifier/regulator with dc linked energy feedback circuit is particularly suited for distributed power system applications

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Dna2 Helicase/endonuclease Interacts with a Novel Protein YHR122W Protein in Saccharomyces cerevisiae (Saccharomyces cerevisiae에서 Dna2 helicase/endonuclease와 YHR122W 단백질의 상호작용)

  • Lee, Hyun-Sun;Choi, Do-Hee;Kwon, Sung-Hoon;Kim, Na-Yeon;Lee, In-Hwan;Kim, Hyun-Jung;Bae, Sung-Ho
    • Korean Journal of Microbiology
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    • v.42 no.1
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    • pp.1-6
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    • 2006
  • Saccharomyces cerevisiae Dna2 helicase/endonuclease plays an essential role in removing DNA primers during Okazaki fragment processing in eukaryotic DNA replication. Genome-wide scale co-immunoprecipitation experiments predicted that Dna2 interacts with a novel protein YHR122W (1). In this study, we observed that overexpression of YHR122W gene suppressed the temperature-sensitive phenotype of $dna2\Delta405N$ mutation. To investigate direct interaction between these two proteins, a histidine-tagged recombinant YHR122W protein was expressed and purified from E. coli. Physical interaction between the purified YHR122W and Dna2 proteins was detected by enzyme-linked immunosorbent assays. Further more, the complex formation was most efficient at physiological salt concentration, 150 mM NaCl. The genetic and physical interactions between YHR122W and Dna2 shown in this study suggest that the biological functions of these two proteins may be closely related each other.