• Title/Summary/Keyword: U&I

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자바시리즈- 오라클 8i 상에서의 Java 활용

  • Jang, Seong-U
    • Digital Contents
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    • no.10 s.77
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    • pp.34-36
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    • 1999

  • 지난 호에서는 DB에서의 자바 접근 지원 방안에 대해서 살펴보았다. 이번 호에서는 실제 프로그래밍 사례로서 오라클8i 상에서의 자바 기반 DB 프로그래밍 방안에 대해 살펴 보기로 한다. JDBC에 기반한 프로그래밍 방안은 이미 많이 알려져 있으므로 이번 호에서는 Java 저장 프로시저의 작성 방법 및 SQLJ에 기반한 프로그래밍 방안에 대해 기술하기로 한다. CORBA 및 EJB에 기반한 프로그래밍 방법은 다음호에서 다루기로 한다.

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A NOTE ON WITT RINGS OF 2-FOLD FULL RINGS

  • Cho, In-Ho;Kim, Jae-Gyeom
    • Bulletin of the Korean Mathematical Society
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    • v.22 no.2
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    • pp.121-126
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    • 1985

  • D.K. Harrison [5] has shown that if R and S are fields of characteristic different from 2, then two Witt rings W(R) and W(S) are isomorphic if and only if W(R)/I(R)$^{3}$ and W(S)/I(S)$^{3}$ are isomorphic where I(R) and I(S) denote the fundamental ideals of W(R) and W(S) respectively. In [1], J.K. Arason and A. Pfister proved a corresponding result when the characteristics of R and S are 2, and, in [9], K.I. Mandelberg proved the result when R and S are commutative semi-local rings having 2 a unit. In this paper, we prove the result when R and S are 2-fold full rings. Throughout this paper, unless otherwise specified, we assume that R is a commutative ring having 2 a unit. A quadratic space (V, B, .phi.) over R is a finitely generated projective R-module V with a symmetric bilinear mapping B: V*V.rarw.R which is nondegenerate (i.e., the natural mapping V.rarw.Ho $m_{R}$ (V, R) induced by B is an isomorphism), and with a quadratic mapping .phi.:V.rarw.R such that B(x,y)=(.phi.(x+y)-.phi.(x)-.phi.(y))/2 and .phi.(rx)= $r^{2}$.phi.(x) for all x, y in V and r in R. We denote the group of multiplicative units of R by U(R). If (V, B, .phi.) is a free rank n quadratic space over R with an orthogonal basis { $x_{1}$, .., $x_{n}$}, we will write < $a_{1}$,.., $a_{n}$> for (V, B, .phi.) where the $a_{i}$=.phi.( $x_{i}$) are in U(R), and denote the space by the table [ $a_{ij}$ ] where $a_{ij}$ =B( $x_{i}$, $x_{j}$). In the case n=2 and B( $x_{1}$, $x_{2}$)=1/2, we reserve the notation [ $a_{11}$, $a_{22}$] for the space.the space.e.e.e.

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Studies on the Production of Acid Resistant Amylase by Molds (part 1) -Isolation and its Cultural pH- (Asp, 속균(屬菌)에 의(依)한 내산성(耐酸性) Amylase 생산(生産)에 관(關)한 연구(硏究) (제 I 보) (第 I 報) -분리(分離) 및 배양(培養) pH에 대(對)하여-)

  • Park, Yoon-Choong;Lee, Suk-Kun
    • Applied Biological Chemistry
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    • v.9
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    • pp.91-96
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    • 1968

  • 1. Two strains of Aspergilli producing acid resistant amylase were isolated from air. The strain $U^{-1}$ and $U^{-2}$ were similar to Asp. usamii tan type mutant in the morphological characteristics. 2. The influence of cultural pH for production of amylase were investigated in the suface culture, it was different each other in the cultural optimum initial pH. The activity of acid resistant amylase produced by strain $U^{-1}$ was higher than that of strain $U^{-2}$. The acid resistance was increased by culturing in lower pH. 3. The lower initial pH ($U^{-1}$ pH 4.0, $U^{-2}$ pH 2.0) was better than neutral (pH 6.0) for the production of amylase and growth of them. The effect of low initial pH for the production of amylase was not to accelerate but caused by change of pH in the cultural process, in the range of this experiment.

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