• 호남수학학술지
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• 제31권4호
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• pp.529-540
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• 2009

The authors have investigated several properties of endomorphism rings of modules. In particular, a closedly simple module and a closedly semi-simple module were defined and then the regularities of its rings of endomorphisms were discussed.

• 충청수학회지
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• 제24권3호
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• pp.553-560
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• 2011

We introduce a method to construct some algebras $R{\in}MC_n(k)$ with dim(R) = n and $dim(m_R^2)=1$ for each $n{\geq}3$.

• Journal of applied mathematics & informatics
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• 제17권1_2_3호
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• pp.605-614
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• 2005

We show that an Artinian O-sequence $h_0,h_1,{\cdots},h_{d-1},h_d\;=\;h_{d-1},h_{d+l}\;>\;h_d$ of codimension 3 is not level when $h_{d-1}\;=\;h_d\;=\;d + i\;and\;h{d+1}\;=\;d+(i+1)\;for\;i\;=\;1,\;2,\;and\;3$, which is a partial answer to the question in [9]. We also introduce an algorithm for finding noncancelable Betti numbers of minimal free resolutions of all possible Artinian O-sequences based on the theorem of Froberg and Laksov in [2].

• 대한수학회보
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• 제54권6호
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• pp.2029-2041
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• 2017

The main aim of this article is to study symmetric (v, k, ${\lambda}$) designs admitting a flag-transitive and point-primitive automorphism group G whose socle is PSU(3, q). We indeed show that such designs must be complete.

• Kyungpook Mathematical Journal
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• 제46권4호
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• pp.597-601
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• 2006

We introduce in this paper the concept of idempotent reflexive right ideals and concern with rings containing an injective maximal right ideal. Some known results for reflexive rings and right HI-rings can be extended to idempotent reflexive rings. As applications, we are able to give a new characterization of regular right self-injective rings with nonzero socle and extend a known result for right weakly regular rings.

• 대한수학회논문집
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• 제18권4호
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• pp.629-633
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• 2003

We investigate in this paper rings containing a finitely generated p-injective maximal left ideal. We show that if R is a semiprime ring containing a finitely generated p-injective maximal left ideal, then R is a left p-injective ring. Using this result we are able to give a new characterization of von Neumann regular rings with nonzero socle.

• 대한수학회보
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• 제58권1호
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• pp.147-161
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• 2021

In this paper, we introduced and studied sa-supplement submodules. A submodule U of a module V is called an sa-supplement submodule in V if there exists a submodule T of V such that V = T + U and U ∩ T is semiartinian. The class of sa-supplement sequences ������ is a proper class which is generated by socle-free modules injectively. We studied modules that have an sa-supplement in every extension, modules whose all submodules are sa-supplement and modules whose all sa-supplement submodules are direct summand. We provided new characterizations of right semiartinian rings and right SSI rings.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제34권2호
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• pp.135-160
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• 2020

본 연구는 수학과 교육과정에 역량을 반영하고 있는 국가를 연구 대상 국가로 선정하여 각국의 수학과 교육과정에 어떠한 역량이 어떻게 반영되어 있는지를 분석함으로써 우리나라 수학과 교육과정의 역량 반영에 대한 개선 방안을 탐색하는 데 목적이 있다. 연구 결과 프랑스의 경우 교과 교육과정에서 학년군에 해당하는 cycle별로 도달해야 하는 학습 역량(우리나라 교과 역량에 해당)의 성취기준을 제시하고, 관련된 공통 역량(socle commun, 우리나라 핵심역량에 해당)을 표시하고 있었다. 또 호주의 경우 학년별에 도달해야 하는 숙달 영역(proficiency strands, 우리나라 교과 역량에 해당)에 대한 성취기준을 제시하고, 교과 교육과정에서 영역별 각각의 성취기준에 관련된 일반 역량(general capabilities, 우리나라 핵심역량에 해당)을 밝히고 있다. 캐나다 브리티시 콜롬비아 주 교육과정에서도 역량을 적극적으로 반영하고 있었는데, 교과 교육과정의 영역을 역량을 중심으로 재편하고, 역량 중심으로 성취기준을 제시하고 있다. 이러한 본 연구의 결과는 차기 교육과정 개정 시 교육과정 총론과 교과 교육과정에서 핵심역량과 교과 역량을 구체화하는 데 시사점을 제공할 수 있을 것으로 보인다.

• 대한수학회보
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• 제56권1호
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• pp.83-102
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• 2019

For $M{\in}R-Mod$, $N{\subseteq}M$ and $L{\in}{\sigma}[M]$ we consider the product $N_ML={\sum}_{f{\in}Hom_R(M,L)}\;f(N)$. A module $N{\in}{\sigma}[M]$ is called an M-multiplication module if for every submodule L of N, there exists a submodule I of M such that $L=I_MN$. We extend some important results given for multiplication modules to M-multiplication modules. As applications we obtain some new results when M is a semiprime Goldie module. In particular we prove that M is a semiprime Goldie module with an essential socle and $N{\in}{\sigma}[M]$ is an M-multiplication module, then N is cyclic, distributive and semisimple module. To prove these results we have had to develop new methods.

• Kyungpook Mathematical Journal
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• 제61권2호
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• pp.239-248
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• 2021

In this paper we study modules with the W F I⁺-extending property. We prove that if M satisfies the W F I⁺-extending, pseudo duo properties and M/(Soc M) has finite uniform dimension then M decompose into a direct sum of a semisimple submodule and a submodule of finite uniform dimension. In particular, if M satisfies the W F I⁺-extending, pseudo duo properties and ascending chain (respectively, descending chain) condition on essential submodules then M = M₁ ⊕ M₂ for some semisimple submodule M₁ and Noetherian (respectively, Artinian) submodule M₂. Moreover, we show that if M is a W F I-extending module with pseudo duo, C₂ and essential socle then the quotient ring of its endomorphism ring with Jacobson radical is a (von Neumann) regular ring. We provide several examples which illustrate our results.