$\Theta$-Derivations on Prime Rings

Kyoo-Hong Park,Yong-Soo Jung 한국전산응용수학회 2003 Journal of applied mathematics & informatics Vol.12 No.1-2

In this paper we show the following: Let R be a prime ring (withcharacteristic dierent wo) and a ∈R. Let Θ, :R → R be automorphisms andletd :R → R be a nonzero Θ-derivation. (iif [d(x), a]Θ = 0 (or d([x, a]) = 0 )for all x ∈R, then a + (a) ∈Z, the center ofR, (iiif .d(x), a. = 0 for allx ∈R, then d(a) = 0. (iiiif [ ad(x), x] = 0 for all x ∈R, then eithera = 0 o rR is commutative.AMS Mathematics Subject Classication : 16W25, 16W20, 16U80Key words and phrases : Prime ring, Θ-derivation1. IntroductionThroughout this paper,R will represent an associative ring andZ will be itscenter. Letx,y∈R. The commutatorxy yx will be denoted by [x, y] and theproductxy+ yx by .x, y.. Let:R → R be an automorphism. We write [x, y]forxy (y)x, and will make extensive use of the following basic commutatoridentities: [xy, z] = x[y, z] + [x, z]y, [xy, z] = x[y, z]+ [x, (z)]y =x[y, z]+[x, z]y, [x, yz]=[x, y]z + (y)[x, z].Let Θ :R → R be an automorphism. An additive mapping d :R → R iscalled a Θ-derivation ifd(xy)=d(x)y ( x)d(y) for all x, y∈R.A 1-derivation is called simply a derivation, where 1 :R → R is the identitymap. A derivationd is inner if there exists ana ∈R such thatd(x)=[x, a] forall x ∈R.LetR be a prime ring with characteristic dierent wo andd : R → R anonzero derivation. In [1], I. N. Herstein proved that ifa ∈R and [d(x), a]=0Received July 10, 2002. Revised January 23, 2003This work was done under the support of Seowon University Research Fund 2002.c. 2003 Korean Society for Computational & Applied Mathematics.313314 Kyoo-Hong Park and Yong-Soo Jungfor allx ∈R, thena ∈Z. As a continuation of our earlier works for derivations([2], [3]), we here improve the above result and obtain some analogous results.

GRAM 작업 관리용 확장형 실행환경 정보 서비스 시스템 설계

김완규,김현주,정미숙,장경일,박규석 진주산업대학교 산업과학기술연구소 2005 산업과학기술연구소보 Vol.- No.12

Grid computing is an emerging technology that promise to unify resources and computing power in many organizations together. It couples a wide variety of geographically distributed computational resources, and presents them as a unified integrated high-end computer. The Globus Resource Allocation and Management(GRAM) service provides for the management and remote execution of jobs defined using a standard Resource Specification Language(RSL) requested by client in grid environment. However, Currently the GRAM has very limited functionality to support for applications that required special execution environment. Here, we provide a proposal for Execution Environment Information interacted with broker to support the GRAM's special execution environment.

생약제제인 이공산(異功散)의 Cisplatin 유도 신장독성 보호 및 항산화 효과

Lee, Kyung-Tae,Ahn, Kyoo-Seok,Chang, Sung-Goo,Oh, Soo-Myung,Jung, Jee-Chang 경희대학교 동서의학연구소 1999 INTERNATIONAL SYMPOSIUM ON EAST-WEST MEDICINE Vol.1999 No.1

Kyung-Tae Lee, Kyoo-Seok Ahn¹, Sung-Goo Chang², Soo-Myung Oh²and Jee-Chang Jung²¹College of Pharmacy, ²Oriental Medicine and ³College of Medicine, and East-West Medical Reserch Institute, Kyung Hee University, Seoul, Korea. Preventive and Antioxidative Effects of Crude Drug Preparation(E-kong-san) on Cisplatin Induced Nephrotoxicity. Proceedings of International Symposium on East-West Medicine, Seoul. 201-211, 1999. -Nephroprotective effects of a crude drug-prearation (E-kong-san) were determined from cisplatin on rabbit kidney proximal tubule and human renal cortical cells by MTT assays and sustained glucose consumption on ciplatin-induced human renal cortical tissue. Levels of creatinine and blood ure nitrogen(BUN) in serum after administration of cisplatin(0.75mg/kg,i.p.) to E-kong-san(0.75g/kg/day,p.o.)-pretreated rats were markedly lower compared to those of cisplatin-treated rats. Moreover, the administration of E-kong-san significantly inhibited the loss of body weight of cisplatin injected rts. These findings suggest that E-kong-san on the cisplatin induced nephrotoxicity led us to investigate whether the effect of this water extract was a result of anti-oxidation. E-kong-san showed strong free radical scavenger activities on 1,1-dipheny1-2picrylhydrazil(DPPH) radical and xanthine/xanthine oxidase(XOD) generated superoxide anion radical(O2-). We further studied the effects of E-kong-san on lipid peroxidation in rat liver microsomes induced by enzymatic and nonenzymatic methods. E-kong-san exhibited significant inhibition on both ascorbic acid/Fe2+and ADP/NADPH/Fe3+ induced lipid peroxidation in rat liver microsomes. Based on these results, we suggest that-E-kong-san attenuate the cisplatin induced cytotoxicity and its mechanism can be eplained by antioxidant.

실험적 종양 모델에서의 자기공명영상과 조직학적 소견의 비교 연구

신규호,서진석,양우익,김남현 中央醫學社 1999 中央醫學 Vol.64 No.1

IL-7 trophic activity on early thymocytes [ Fifth Annual Conference of International Cytokine Society , Nov. 9-13 , 1997 ]

K.Yoo 충북대학교 약품자원개발연구소 1997 약학논문집 Vol.12 No.-

후발브랜드가 성숙시장에서 선발브랜드를 앞서는 전략에 대한 사례연구 : -유한킴벌리의 그린핑거 성공사례-

최규복, 윤승기, 김근배 숭실대학교 2009 숭실경영연구 Vol.1 No.1

Prior studies show late entrants can overcome pioneer under several conditions as like innovative product, premium price, trendy category and overlapped target market effect and significantly heavier promotion supports. This study shows several similarities with prior studies. In case of superior product performance, concept and overlapped target market, this study and prior studies have very similarity. Furthermore, this study show GREEN FINGER case has more conditions than each of prior study to overpass pioneer within short period. As a result, this study shows a good case which late entrants can overtake in any category even though pioneer effect is so strong. Keywords: Green Finger, Pioneer, Late entrants, Innovative product, Premium product 선행 연구에 의하면 선발브랜드를 제압하는 후발브랜드가 되기 위한 조건에는 후발브랜드의 제품이 혁신적이거나, 프리미엄제품, 소비자의 취향이 빈번하게 변하는 제품, 후발브랜드의 기존제품과 유사한 타깃소비자, 유통 등을 가진 제품 경우와 선발브랜드보다 엄청나게 많은 광고판촉지원을 하는 경우라고 한다. 그린핑거의 사례는 선행연구를 지원하는 대표적인 사례가 될 수 있고, 어느 카테고리에서든지, 어느 시장에서든지 선발브랜드 효과가 아무리 강하더라도 후발브랜드가 어떤 제품전략과 마케팅전략으로 시장에 진입하고 활동하느냐에 따라 선발브랜드를 추월할 수 있다는 것을 보여주는 좋은 마케팅사례라고 할 수 있다. 주제어: 그린핑거, 선발브랜드, 후발브랜드, 혁신제품, 프리미엄제품, 유사시장효과

확장 페트리 네트의 시간 개념에 관한 조사

김규년,B. Corjsuren 울산대학교 1997 공학연구논문집 Vol.28 No.2

본 논문에서 우리는 실시간 동시발생 시스템을 설계 및 분석할 때 고려되는 시간 개념과 시간적인 제한(timing constraint)들의 역할에 대해 알아보고, 시간 관련 페트리 네트 확장들을 자세히 살펴봐서 시간 개념이 어떤 방향으로 응용되어 가는가를 조사한 것을 소개한다. 확장된 페트리 네트들은 각각 자신의 방법으로 일반 페트리 네트에 시간 개념을 추가시켰다. 시간 개념이 주로 트랜지션 발사 허용 및 점화 규칙에 추가되었기 때문에 분류 기준을 발사 허용 및 점화 규칙의 관점과 시간적인 제한의 관점으로 정하였다. 조사 결과 실시간 동시발생 시스템의 설계와 성능 분석을 가장 도울 수 있는, 요구 사항을 모형화 하는데 제일 적합한 페트리 네트를 찾고자 한다. In this paper, we will find out about the concepts of time and timing constraints and their roles in designing and analyzing of the real-time concurrent systems, and review the time related extensions of Petri net for Petri net for a survey on their implementation direction of time concept. Extended Petri nets are added the concept of time into the original Petri net using their own methods. Time concepts are mostly added to the enabling and firing rules, so therefore, we classify Petri nets from the enabling and firing rules point of view and the timing constraints point of view. As a result we hope to find the Petri net that can help design and analysis of concurrent real-time system, and that is mostly suitable for modeling the requirements specification.

노인의 대사성 증후군의 위험 요인에 체구성, 심폐기능 및 근력과의 상관관계

윤규태,최기수,강현주 순천향대학교 기초과학연구소 2004 순천향자연과학연구 논문집 Vol.10 No.2

We investigated the association of body composition, cardiorespiratory fitness and muscle strength to the metabolic syndrome risk factors in elderly persons. 53 elderly persons aged 65-75 years evaluated the metabolic syndrome risk factors(centeral obesity, high blood pressure, HDL-cholesterolemia, hypertriglyceridemia, hyperglycemia), as defined by the criteria given in the Adult Treatment Panel Ⅲ. In the relation of body composition among the metabolic syndrome risk factors, WC had a positive correlation with weight, BMI, and WHR, and DBP had a negative correlation with WHR,FBG had a positive correlation with weight, BMI, and WHR, and HDL-C had a negative correlation with weight, BMI, and WHR. In the health related physical fitness, WC had a positive correlation with UMS, LMS, and TMS, LMS, and TMS, TG had a negative correlation with VO_(2)max and HDL-C had a positive correlation with VO_(2)max, UMS, LMS, and TMS. This study suggest that the metabolic syndrome risk factors are affected by body composition, cardiorespiratory fitness and muscle strength.

근로시간 단축의 경제적 효과

조규흔 조선대학교 경영경제연구소 2001 經營經濟硏究 = Management and economics research Vol.24 No.2

자연채광 시스템의 성능 평가를 위한 실내 조도 예측 및 조명제어 컴퓨터 모델 개발

송규동,이주윤,유기형 대한건축학회 2003 대한건축학회논문집 Vol.19 No.3

It is necessary to provide sufficient daylighting for the high quality lighting in interior space. In these days various kinds of daylighting systems are developed and applied to buildings, however the difference of the purpose of an object room and a physical environment makes the Daylighting system to be unuseful. Therefore it is necessary to estimate the performances of the Daylighting system using the Computer program to apply the Daylighting system usefully. The purpose of this study is to develop the computer program using the Monte Calro Method and Ray-tracing technique to estimate the performances of the Daylighting system in interior space and the consumption of electric energy by dimming control of electric lighting. The accuracy of the computer model was validated through measurements with physical scale models under real clear sky conditions.