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- 저자 : 천정수 (검색결과 8 건)
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An elaboration of annihilators of polynomials
천정수,김홍기,김남균,이창익,이양,성효진 대한수학회 2017 대한수학회보 Vol.54 No.2
In this note we elaborate first on well-known theorems for annihilators of polynomials over IFP rings by investigating the concrete shapes of nonzero constant annihilators. We consider next a generalization of IFP which preserves Abelian property, in relation with annihilators of polynomials, observing the basic structure of rings satisfying such condition.
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McCoy condition on ideals of coefficients
천정수,곽태근,허찬,이양 대한수학회 2013 대한수학회보 Vol.50 No.6
We continue the study of McCoy condition to analyze zero- dividing polynomials for the constant annihilators in the ideals generated by the coefficients. In the process we introduce the concept of ideal-π- McCoy rings, extending known results related to McCoy condition. It is shown that the class of ideal-π-McCoy rings contains both strongly McCoy rings whose non-regular polynomials are nilpotent and 2-primal rings. We also investigate relations between the ideal-π-McCoy property and other standard ring theoretic properties. Moreover we extend the class of ideal-π-McCoy rings by examining various sorts of ordinary ring extensions.
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외식기업 O2O플랫폼 서비스가 고객만족 및 구매의도에 미치는 영향 - 고객만족의 매개효과 -
천정수,김경자,허진 한국호텔리조트학회 2023 호텔리조트연구 Vol.22 No.3
From 11 to 26 October 2021, targeting consumers who have used O2O platform services in Seoul and Gyeonggi Province to examine the relationship between the impact of O2O platform services on customer satisfaction and consumer purchasing behavior and to verify the mediating role of customer satisfaction. The questionnaire was received by October 26, and 381 questionnaires were analyzed, and it was confirmed that ease of use, economic feasibility, and safety, which are sub-factors of the O2O platform service, all had a significant and positive impact on customer satisfaction and purchase intention. In addition, as a result of verifying the mediating effect of customer satisfaction between the significance of purchase intention and the O2O platform service and purchase intention, it was verified that the more satisfied the customer was with the O2O platform service, the clearer the consumer's purchase intention. Consumers using the O2O platform service were found to have high purchasing power. Furthermore, in order to secure practical value for consumers, we developed customized services such as information on various events and discount events, and secured stability for personal information protection to cater for food service companies. This suggests the need to establish a steady marketing strategy to develop ties between customers and customers.
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천정수,김은정,이창익,신윤호 대한수학회 2011 대한수학회보 Vol.48 No.2
We show that the θ-prime radical of a ring R is the set of all strongly θ-nilpotent elements in R, where θ is an automorphism of R. We observe some conditions under which the θ-prime radical of R coincides with the prime radical of R. Moreover we characterize elements in prime radicals of skew Laurent polynomial rings, studying (θ, θ^-1)-(semi)primeness of ideals of R. We show that the θ-prime radical of a ring R is the set of all strongly θ-nilpotent elements in R, where θ is an automorphism of R. We observe some conditions under which the θ-prime radical of R coincides with the prime radical of R. Moreover we characterize elements in prime radicals of skew Laurent polynomial rings, studying (θ, θ^-1)-(semi)primeness of ideals of R.
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PRIME RADICALS IN UP-MONOID RINGS
천정수,김진아 대한수학회 2012 대한수학회보 Vol.49 No.3
We first show that the semiprimeness, primeness, and reducedness can go up to up-monoid rings. By these results we can compute the lower nilradicals of up-monoid rings, from which the well-known fact of Amitsur and McCoy for the polynomial rings can be extended to up-monoid rings.
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천정수,박한선 해양환경안전학회 2021 해양환경안전학회지 Vol.27 No.2
선박을 포함한 지상, 해상, 공중의 이동체는 일반적으로 사람에 의해서 운용되고 있는데, 최근 제4차 산업혁명에 따른 자율의사결정시스템과 인공지능의 획기적 발전을 기반으로 자율 이동 개념의 무인이동체에 대한 연구개발이 전 세계적으로 활발하게 진행되고 있다. 국제해상운송에서 자율운항선박(MASS)의 상용화 실현을 앞두고 이 선박에 대한 성격 규정과 국제법적 지위에 대한 규명이 시급해졌다. 자율운항선박은 발전단계에 따라 승선원이 점차 감축되어 결국에는 완전히 무인화된 선박으로 운용될 것인데, 이 연구를 통하여 승선원이 없는 선박도 국제법상 선박으로써의 지위를 인정받을 수 있는가에 대한 쟁점 사항을 분석하였다. 이를 위하여 유엔해양법협약(UNCLOS) 및 국제해사기구(IMO)의 제반 법규를 중심으로 자율운항선박은 일반선박과 동일한 국제법적 지위를 가지고 있음을 규명하고, 자율운항선박을 운용하는데 필요한 제반 국제협약의 제·개정작업에 관한 제도개선 방향과 국제법적 조치사항을 제시하였다. Ground, sea and air mobility, such as vehicles, ships, and airplanes, are generally operated by people. Based on the innovative development of autonomous decision-making systems and artificial intelligence (AI) following the recent fourth industrial revolution, research and development on maritime autonomous surface ships (MASS) is been actively performed around the world. Before the realization of the commercialization of MASS in international maritime transport, it is urgent to clarify the characteristics of this ship and its international legal status. This paper aims to analyze the concern of whether a ship without crew members will eventually be operated as a fully unmanned ship or can be recognized as a ship under international law as the number of crew members is gradually reduced owing to the development stage of autonomous ships. Consequently, based on the United Nations Convention on the Law of the Sea (UNCLOS) and the regulations of the International Maritime Organization (IMO), it was found that MASS has the same international legal status as general ships. In addition this paper presents the working principles of enacting and revising the IMO Conventions and international legal measures necessary for the safe operation of MASS.
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천정수(Jeoung Soo Cheon),남상복(Sang Bok Nam),윤상조(Sang Jo Yun) 충청수학회 2020 충청수학회지 Vol.33 No.3
This article continues the study of right π-duo rings, concentrating on the situation of nonzero powers. For this purpose we introduce the concept of strongly right π-duo and examine the structure of strongly right π-duo in relation to various ring properties that play important roles in ring theory. It is proved for a strongly right π-duo ring R that if the upper (lower) nilradical of R is zero then R is reduced. Various kinds of examples are examined in relation to the questions raised in the procedure.
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REDUCED MODULES AND STRONGLY REGULAR RINGS
허찬,천정수,김두원 영남수학회 2017 East Asian mathematical journal Vol.33 No.1
It is a well-known fact that a ring R is regular if and only if every left R-modules is flat. In this article we prove that a ring R is strongly regular if and only if every left R-modules is reduced if and only if every left-R modules is quasi-reduced.
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