• Title/Summary/Keyword: 1D1R

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Relationship Between the Body Dimension of Sea Eel , Astroconger Myriaster and the Mesh Size of Fishing Gears (붕장어의 어체제원과 어구강목과의 관계)

  • 장충식
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.23 no.4
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    • pp.184-188
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    • 1987
  • The author studied to analyse the relationship between the body dimension of sea eel, Astroconger myriaster and the mesh size of fishing gears. The samples were caught by traps and pots during September, 1987 in the Southern Sea of Korea. The results obtained can be summarized as follows: 1. The relationship between total length L, body weight W and diameter D may be expressed as: W=3.58$\times$10 super(-4) L super(3.38) (r=0.99). D=0.07 L-0.59 (r=0.99). W=10.38 D super(2.76) (r=1.00). W=1/2$\times$D super(2).L. 2. The mesh size of traps and the hole diameter of post must be more than 29.2 mm and 18.6 mm, respectively.

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Grignard Coupling Reaction of Bis(chloromethyl)diorganosilanes with Dichloro(diorgano)silanes: Syntheses of 1,3-Disilacyclobutanes

  • 조연석;유복렬;안삼영;정일남
    • Bulletin of the Korean Chemical Society
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    • v.20 no.4
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    • pp.427-430
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    • 1999
  • The Grignard coupling reaction of bis(chloromethyl)diorganosilanes [(ClCH2)2SiR1R2: R1 = R2 = Me, la; R1 = Me, R2 = Ph, lb; R1 = R2 = Ph, lc] with diorganodichlorosilanes [(Cl2SiR3R4: R3 = R4 = Me, 2a; R3 = Me, R4 = Ph, 2b; R3 = R4 = Ph, 2c] at THE reflux temperature gave the intermolecular C-Si coupling product of 1,1,3,3-tetraorgano-1,3-disilacyclobutanes 3a-f in poor to moderate yields ranging from 7% to 50% along with polydiorganosilapropanes. The cyclization reaction of la-c with methyl-substituted dichlorosilanes 2a, b gave 1,3-disilacyclobutanes 3a-c, e, d in moderate yields (42-50%), while the same reaction with dichlorodiphenylsilane (2c) to 1,3-disilacyclobutanes 3d, f resulted in low yield (7-18%) probably due to the steric hindrance of two-phenyl groups on the silicon of 2c.

Two Stages of R&D Spillovers: Technological and Economic Impacts

  • Cho, Kawon
    • STI Policy Review
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    • v.1 no.3
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    • pp.53-68
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    • 2010
  • This paper empirically evaluates the effects of regional and industrial R&D on the performances of individual firms in two separated stages: (1) the stage of technological outcome from R&D and (2) the stage of economic outcome from technological outcome. Technological spillovers are separated from negative congestion effects through the stage-specific estimation. The firm-level Korean Innovation Survey data merit in coping with the endogeneity problem inherent in the estimation of spillovers. The estimation results show that: (1) there exist significant R&D spillovers both in regional and industrial dimensions, (2) the hypothesized technological spillovers and economic congestion effects are both in effect, and (3) firms with smaller individual R&D investments show greater spillovers.

Liquid Chromatography-Solid Phase Extraction-NMR (LC-SPE-NMR) Analysis of Liquid Crystalline Mixtures

  • Park, Gregory Hyung-Jin;Park, Ae-Na;Rho, Kyung-Rae;Shin, Jong-Ho;Kim, Yeong-Jeon;Jo, Sung-Chan;Oh, Weon-Sik
    • Journal of the Korean Magnetic Resonance Society
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    • v.15 no.1
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    • pp.14-24
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    • 2011
  • We have performed Liquid Chromatography-Solid Phase Extraction-NMR (LC-SPE-NMR) analysis for liquid crystalline mixture and elucidated the structures of selected components by NMR spectra. Combining the results of one-dimensional 1H experiments as well as homonuclear and heteronuclear two-dimensional experiments, we could analyze the molecular structure of the liquid crystal singles whose structure had not been interpretable by mass spectrometry alone.

Human Resource Management for R&D Professionals with Ph.D. degree (R&D 전문가를 위한 인력관리 : 박사급 인력을 중심으로)

  • 김영배;차종석
    • Journal of Technology Innovation
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    • v.7 no.1
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    • pp.124-150
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    • 1999
  • This study examines the personal characteristics, organizational attitudes, technical performances, and reward preferences of R&D professionals with Ph.D. degree in large private companies in Korea. Based on survey data from 887 professionals in nine different R&D organizations, the following results are found; 1) R&D professionals with Ph.D. degree exhibit higher autonomy preference, need for achievement, self-efficacy, technical career orientation, and performance proficiency than other R&D professionals; 2) As their organizational tenure increases, performance proficiency and transfer career orientation increases but their socialized level of organizational goals and values does not change; 3) They produce more technical publications and exhibit more positive organizational attitude than other R&D professionals; 4) They are more likely to prefer job content, professional, and job security rewards. These empirical findings suggest several theoretical and practical implications for the management of R&D professionals with Ph.D. degree in the large Korean firms.

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The Compensation of Pixel Voltage Error for a-Si TFT LCDs Regarding the Input Gamma Voltage

  • Kang, Seung-Jae;Lee, Jun-Pyo;Park, Young-Bae;Moon, Hoi-Sik;Kong, Hyang-Shik;Kim, Kyung-Seop;Kim, Sang-Su;Kim, Su-Ki
    • 한국정보디스플레이학회:학술대회논문집
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    • 2002.08a
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    • pp.560-562
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    • 2002
  • The liquid crystal(LC) pixel capacitance Clc, which varies as a function of applied pixel voltage, is a main factor of pixel voltage errors on input gamma voltage, and therefore of the electro-optics(E-O) characteristics of LC pixel for a-Si TFT LCDs. The pixel voltage error(${\Delta}$Vp) for input gamma voltage was simulated for 14.1 inch diagonal XGA panel. An agreement between the experimental results and simulation was satisfactory for the gamma voltage compensation, ${\Delta}$Vp of the input gamma voltage. The proposed compensation method was successfully introduced to a 14.1 inch diagonal XGA panel, and a remarkable improvement of image sticking was achived.

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The Effects of Feeding Organic Feed on the Growth and Carcass Characteristics of Hanwoo Steers (유기사료 급여가 거세한우의 성장 및 도체특성에 미치는 영향)

  • Jeon, B.S.;Song, J.I.;Jeon, J.H.;Kwag, J.H.;Jang, S.S.;Kwon, E.G.;Cho, Y.M.;Cho, W.M.;Choi, H.C.;Park, K.H.;Yoo, Y.H.
    • Journal of Animal Environmental Science
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    • v.14 no.2
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    • pp.81-90
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    • 2008
  • This study was carried out to investigate the effects of the organic feed on weight gain, feed conversion rate, and carcass characteristics of Hanwoo steers. Three feeding treatments(T1 : rice straw and commercial concentrates, T2 : organic hay and concentrates, T3 : organic corn silage and concentrates) for 22 months (from 6 to 28 months) were used. As a result, weight gain was not significantly different among treatments throughout this study. Also T1 tended to improve weight gain and daily weight gain without significance. The percentage of meat quality grade over the first grads ($1,\;1^+,\;1^{++}$) were 50% in the carcass of Hanwoo steers fed T1 and T2, and 70% fed T3, respectively. T2 and T3 tended to improve marbling score and oleic acid content.

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EFFECTS OF ISOTHIAZOLE AND ISOXAZOLE DERIVATIVES AS SELECTIVE CYCLOOXYGENASE-2 INHIBITORS

  • Ryu, Hyung-Chul;Park, Sang-Wook;Noh, Ji-Young;Kim, Jong-Hoon;Park, Hyun-Jung;Chung, Young-Mee;Chae, Myeong-Yun;Cho, Il-Hwan
    • Proceedings of the PSK Conference
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    • 2002.10a
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    • pp.355.3-356
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    • 2002
  • Prostaglandins are synthesized by the enzyme cyclooxygenase (COX). Both constitutive (COX-1) and inducible (COX-2) isoforms have been identified. COX-2 expression is stimulated by inflammatory mediators such as growth factors and cytokines. Most non-steroidal anti-inflammatory drugs (NSAIDS) inhibit both isoforms of COX. Recent evidence suggests that selective inhibitors of COX-2 may possess diminished side effects reletive to common NSAIDS. Novel isothiazoles and isoxazoles were identified as selective inhibitiors of cycloxygenase-2(COX-2). (omitted)

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DERIVATION MODULES OF GROUP RINGS AND INTEGERS OF CYCLOTOMIC FIELDS

  • Chung, I.Y.
    • Bulletin of the Korean Mathematical Society
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    • v.20 no.1
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    • pp.31-36
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    • 1983
  • Let R be a commutative ring with 1, and A a unitary commutative R-algebra. By a derivation module of A, we mean a pair (M, d), where M is an A-module and d: A.rarw.M and R-derivation, i.e., d is an R-linear mapping such that d(ab)=a)db)+b(da). A derivation module homomorphism f:(M,d).rarw.(N, .delta.) is an A-homomorphism f:M.rarw.N such that f.d=.delta.. A derivation module of A, (U, d), there exists a unique derivation module homomorphism f:(U, d).rarw.(M,.delta.). In fact, a universal derivation module of A exists in the category of derivation modules of A, and is unique up to unique derivation module isomorphisms [2, pp. 101]. When (U,d) is a universal derivation module of R-algebra A, the A-module U is denoted by U(A/R). For out convenience, U(A/R) will also be called a universal derivation module of A, and d the R-derivation corresponding to U(A/R).

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Predominant $D_1$ Receptors Involvement in the Over-expression of CART Peptides after Repeated Cocaine Administration

  • Hu, Zhenzhen;Oh, Eun-Hye;Chung, Yeon Bok;Hong, Jin Tae;Oh, Ki-Wan
    • The Korean Journal of Physiology and Pharmacology
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    • v.19 no.2
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    • pp.89-97
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    • 2015
  • The aim of this study was to investigate the involvement of dopaminergic receptors (DR) in behavioral sensitization, as measured by locomotor activity, and the over-expression of cocaine- and amphetamine-regulated transcript (CART) peptides after repeated administration of cocaine in mice. Repeated administrations of cocaine induced behavioral sensitization and CART over-expression in mice. The levels of striatal CART mRNA were significantly increased on the $3^{rd}$ day. CART peptides were over-expressed on the $5^{th}$ day in the striata of behaviorally sensitized mice. A higher proportion of $CART^+$ cells in the cocaine-treated mice were present in the nucleus accumbens (NAc) shell than in the dorsolateral (DL) part of caudate putamen (CP). The concomitant administration of both $D_1R$ and $D_2R$ antagonists, SCH 23390 ($D_1R$ selective) and raclopride ($D_2R$ selective), blocked cocaine induced-behavioral sensitization, CART over-expression, and cyclic adenosine 5'-monophosphate (cAMP)/ protein kinase A (PKA)/phospho-cAMP response element-binding protein (pCREB) signal pathways. SCH 23390 more predominantly inhibited the locomotor activity, CART over-expression, pCREB and PKA activity than raclopride. Cocaine induced-behavioral sensitization was also attenuated in the both $D_1R$ and $D_2R$ knockout (KO) mice, respectively. CART over-expression and activated cAMP/PKA/pCREB signal pathways were inhibited in the $D_1R$-KO mice, but not in the $D_2R$-KO mice. It is suggested that behavioral sensitization, CART over-expression and activated cAMP/PKA/pCREB signal pathways induced by repeated administration of cocaine could be more predominantly mediated by $D_1R$.