• Title/Summary/Keyword: J-R

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A note on convexity on linear vector space

  • Hong, Suk-Kang
    • Journal of the Korean Statistical Society
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    • v.1 no.1
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    • pp.18-24
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    • 1973

  • Study on convexity has been improved in many statistical fields, such as linear programming, stochastic inverntory problems and decision theory. In proof of main theorem in Section 3, M. Loeve already proved this theorem with the $r$-th absolute moments on page 160 in [1]. Main consideration is given to prove this theorem using convex theorems with the generalized $t$-th mean when some convex properties hold on a real linear vector space $R_N$, which satisfies all properties of finite dimensional Hilbert space. Throughout this paper $\b{x}_j, \b{y}_j$ where $j = 1,2,......,k,.....,N$, denotes the vectors on $R_N$, and $C_N$ also denotes a subspace of $R_N$.

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ON S-EXCHANGE RINGS

  • Liu, Dajun;Wei, Jiaqun
    • Bulletin of the Korean Mathematical Society
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    • v.57 no.4
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    • pp.945-956
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    • 2020

  • We introduce the concept of S-exchange rings to unify various subclass of exchange rings, where S is a subset of the ring. Many properties on S-exchange rings are obtained. For instance, we show that a ring R is clean if and only if R is left U(R)-exchange, a ring R is nil clean if and only if R is left (N(R) - 1)-exchange, and that a ring R is J-clean if and only if R is left (J(R) - 1)-exchange. As a conclusion, we obtain a sufficient condition such that clean (nil clean property, respectively) can pass to corners and reprove that J-clean passes to corners by a different way.

  • https://doi.org/10.4134/BKMS.b190642 인용 PDF KSCI

Effects of Mitochondrial DNA Polymorphism on Growth Traits of Hanwoo (mt DNA 다형이 한우 성장에 미치는 영향)

  • Jeon, G.J.;Chung, H.Y.;Choi, J.G.;Lee, M.S.;Chung, Y.H.;Lee, C.W.;Park, J.J.;Ha, J.M.;Lee, H.K.;Na, K.J.
    • Journal of Embryo Transfer
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    • v.18 no.3
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    • pp.227-235
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    • 2003

  • 한우의 mt DNA cytochrome oxidase subunit I, II, 및 III complex지역의 유전적 다형현상을 제한효소를 이용하여 검출하였다. PCR primer 6종에 대하여 20가지 제한효소를 처리하였으며, Pst I, Pvu II, Rsa I, Eco RI, Bgl II, and Msp I 제한효소를 사용하여 유전적 변이를 검출하였다. 검출된 변이체와 한우의 성장과의 관련성을 조사한 결과 cytochrome oxidase subunit III complex 지역의 유전염기서열을 근거로 제작한 primer Mt9 좌위에서 제한효소 PvuII를 이용한 절단형과 체중형질 인 WT15(P<0.05) 및 WT18(P<0.01)에서 고도의 유의성이 관찰되었다. 아울러 , Mt9-Pvu II(P=0.07), Mt6-Bgl II(P=0.05), and Mt8-Rsa I(P=0.05) 좌위 또한 WT9, WTl5, and WT15에서 각각 통계적 유의성이 관찰되었다. 따라서 본 결과는 cytochrome oxidase subunit III complex segments가 candidate gene으로서 기초적 유전정 보 제공은 물론 유전적 개량을 위해 사용될 수 있을 것으로 사료된다.

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J_{Ic}$ evaluation of smooth and side-grooved CT specimens in submerged arc-welded SB 41 (SB41강 潛弧熔接部의 平滑 및 側面을 CT試驗片의 J_{Ic}$ 評價)

  • 오세욱;안광주;이태종
    • Journal of Welding and Joining
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    • v.4 no.1
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    • pp.47-57
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    • 1986

  • The elastic-plastic fracture toughness J_{Ic}$ of submerged arc welded structural steel $SB_{41}$ which has the properties of low strength and high ductility was discussed, especially paying attention to a comparison between two methods recommended by ASTM and JSME. $J_{IC}$ tests were carried out with compact specimens by means of R-curve, SZW, ultrasonic and electric potential methods. Based on the investigations in this study, the results obtained are as follows; (1) The JSME R-curve method gave the smallest $J_{IC}$ values which were physically closest to the crack initiation and seemed to be more practical and stable procedure between the two R-curve methods. (2) The JSME SZW method tended to slightly overestimate the $J_{IC}$ values at initiation of ductile tearing. (3) The ultrasonic and electric potential methods which also had a tendency to overestimate these $J_{IC}$ values were confirmed to be applicable and useful in determining these values. (4) The $J_{IC}$ values by the JSME R-curve method were 18.06 kgf/mm and 17.25kgf/ mm for the smooths and the side grooved CT specimen respectively.

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