• 경영과정보연구
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• 제19권
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• pp.199-221
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• 2006

The purpose of this study is to expand businesses' adoption of the Enterprise Resource Planning System (E.R.P.S.). In order to accomplish the objective, the following conditions need to be fulfilled. 1) Clearness of the goal and expected effect of E.R.P.S. adoption 2) Definiteness of the extent of E.R.P.S. construction 3) The management's will to E.R.P.S. adoption If the E.R.P.S is adopted, the following effects are expected. 1) Speedy quality decision-making is possible. 2) Time taken from the order of the product to its release can be curtailed (from 40days to 10days). 3) Time taken for the development of the product can be shortened (from 24 months to 10 months). 4) Cost reduction is possible by using necessary information in real time.

• 중소기업연구
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• 제41권1호
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• pp.75-96
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• 2019

본 연구의 목적은 기업 내 최고의사결정권한을 가진 CEO의 특성이 R&D 투자 결정과 기업가치에 어떠한 영향을 미치는지를 검증하는 것이다. 구체적으로 CEO의 특성을 나이, 학력, 전공일치, 재직기간으로 측정하여, 이러한 특성이 연구개발투자 및 기업가치에 미치는 영향을 실증적으로 분석하였다. 2005년부터 2014년까지 코스닥 시장에 상장된 벤처기업을 대상으로 실증 분석한 결과는 다음과 같다. 첫째, CEO의 나이는 적을수록 R&D 투자를 보다 많이 하는 것으로 나타났으며, 나이가 적은 CEO의 R&D 투자는 기업가치와 유의한 양(+)의 상관성을 보이는 것으로 나타났다. 둘째, CEO의 학력은 높을수록 R&D 투자를 보다 많이 하는 것으로 나타났고, 교육수준이 높은 CEO의 R&D 투자는 주가와 유의한 양(+)의 관련성을 보였다. 셋째, CEO의 전공과 업종이 일치할수록 R&D 투자는 보다 많이 하는 것으로 나타났으며, CEO의 전공일치도가 높은 기업의 R&D 투자와 주가와의 가치관련성은 보다 높은 것으로 나타났다. 마지막으로 CEO의 재직기간은 길수록 R&D 투자에 보다 적극적인 태도를 보였으나, 재직기간이 긴 CEO의 R&D 투자는 기업가치와 유의한 음(-)의 관련성을 보였다. 이와 같은 실증 분석을 통해 벤처기업의 R&D 투자와 기업가치관련성은 CEO의 특성이 반영된다는 사실을 확인할 수 있었다. 본 연구는 CEO의 인구통계학적 특성을 반영한 R&D 투자가 자본시장에서 어떻게 평가 받고 있는지를 실증적으로 검증하였다는 점에 의의가 있다.

• 대한수학회논문집
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• 제12권2호
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• pp.393-401
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• 1997

Let $A_1,A_2,\cdots,A_m$ and $B_1,B_2,\cdots,B_n$ be two sequences of events on a given probability space. Let $X_m$ and $Y_n$, respectively, be the number of those $A_i$ and $B_j$, which occur we establish new upper and lower bounds on the probability $P(X=r, Y=t)$ which improve upper bounds and classical lower bounds in terms of the bivariate binomial moment $S_{r,t},S_{r+1,t},S_{r,t+1}$ and $S_{r+1,t+1}$.

• 대한수학회보
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• 제46권3호
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• pp.599-605
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• 2009

Let R be a prime ring, H a generalized derivation of R and L a noncommutative Lie ideal of R. Suppose that $u^sH(u)u^t$ = 0 for all u $\in$ L, where s $\geq$ 0, t $\geq$ 0 are fixed integers. Then H(x) = 0 for all x $\in$ R unless char R = 2 and R satisfies $S_4$, the standard identity in four variables.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1995년도 추계 학술대회지
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• pp.42-43
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• 1995

• 한국가스학회:학술대회논문집
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• 한국가스학회 2003년도 춘계학술발표회 논문집
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• pp.159-164
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• 2003

• 대한수학회논문집
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• 제15권2호
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• pp.257-261
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• 2000

Northcott and Mckerrow proved that if R is a left noe-therian ring and E is an injective left R-module, then E[x-1] is an injective left R[x]-module. In this paper we generalize Northcott and McKerrow's result so that if R is a left noetherian ring and E is an in-jective left R-module, then E[x-S] is an injective left R[xS]-module, where S is a submonoid of N (N is the set of all natural numbers).

• 한국재료학회:학술대회논문집
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• 한국재료학회 1998년도 IUMRS-ICEM ABSTRACT BOOK
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• pp.98.3-98
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• 1998

• 대한수학회지
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• 제52권6호
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• pp.1323-1336
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• 2015

Let S be a semigroup with 0 and R be a ring with 1. We extend the definition of the zero-divisor graphs of commutative semigroups to not necessarily commutative semigroups. We define an annihilating-ideal graph of a ring as a special type of zero-divisor graph of a semigroup. We introduce two ways to define the zero-divisor graphs of semigroups. The first definition gives a directed graph ${\Gamma}$(S), and the other definition yields an undirected graph ${\overline{\Gamma}}$(S). It is shown that ${\Gamma}$(S) is not necessarily connected, but ${\overline{\Gamma}}$(S) is always connected and diam$({\overline{\Gamma}}(S)){\leq}3$. For a ring R define a directed graph ${\mathbb{APOG}}(R)$ to be equal to ${\Gamma}({\mathbb{IPO}}(R))$, where ${\mathbb{IPO}}(R)$ is a semigroup consisting of all products of two one-sided ideals of R, and define an undirected graph ${\overline{\mathbb{APOG}}}(R)$ to be equal to ${\overline{\Gamma}}({\mathbb{IPO}}(R))$. We show that R is an Artinian (resp., Noetherian) ring if and only if ${\mathbb{APOG}}(R)$ has DCC (resp., ACC) on some special subset of its vertices. Also, it is shown that ${\overline{\mathbb{APOG}}}(R)$ is a complete graph if and only if either $(D(R))^2=0,R$ is a direct product of two division rings, or R is a local ring with maximal ideal m such that ${\mathbb{IPO}}(R)=\{0,m,m^2,R\}$. Finally, we investigate the diameter and the girth of square matrix rings over commutative rings $M_{n{\times}n}(R)$ where $n{\geq} 2$.

• 원예과학기술지
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• 제33권6호
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• pp.869-876
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• 2015

Wild relative species of domesticated crops are useful genetic resources for improving agronomic traits. Cytogenetic investigations based on chromosome composition provide insight into basic genetic and genomic characteristics of a species that can be exploited in a breeding program. Here, we used FISH analysis to characterize the ploidy level, chromosome constitution, and genomic distribution o f 5S and 4 5S r ibosomal DNA (rDNA) in four wild Cucurbitaceae species, namely, Citrullus lanatus (Thunb.) Mansf. var. citroides L. H. Bailey (2n = 22), Melothria japonica Maxim. (2n = 22), Sicyos angulatus L. (2n = 24), and Trichosanthes kirilowii Maxim. (2n = 66, 88, 110 cytotypes), collected in different areas of Korea. All species were diploids, except for T. kirilowii, which included hexa-, octa-, and decaploid cytotypes (2n = 6x = 66, 8x = 88, and 10x = 110). All species have small metaphase chromosomes in the range of $2-5{\mu}m$. The 45S rDNA signals were localized distally compared to the 5S rDNA. C. lanatus var. citroides and M. japonica showed one and two loci of 45S and 5S rDNA, respectively, with co-localization of rDNA signals in one M. japonica chromosome. S. angulatus showed two co-localized signals of 5S and 45S rDNA loci. The hexaploid T. kirilowii cytotype showed five signals each for 45S and 5S rDNA, with three being co-localized. This is the first report of hexaploid and decaploid cytotypes in T. kirilowii. These results will be useful in future Cucurbitaceae breeding programs.