$\Theta$-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.

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

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.-

보울피더의 位相制御에 관한 硏究

박규성,김교형 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.1

Recently, people have been concerned about factory automation because of the development of the technology. Increasing of labor cost, machine is substituted for the worker who works at the simple assembly line. In this paper, we developed the controller using phase control for the performance improvement of the vibratory bowl feeder. This controller consists of TRIAC as switching device and UJT as gate trigger. Phase controller successfully controlled power to the load without loss.

持續가능한 開發의 관한 硏究

韓圭秀 서울市立大學校 1997 論文集 Vol.31 No.-

지구성 운동이 자연발생 고혈압 흰쥐의 혈압에 미치는 영향

이규승,전병화,김일곤,전종귀 忠南大學校體育科學硏究所 1996 體育科學硏究誌 Vol.14 No.1

The purpose of this study is to investigate the effects of indurance exercise on BP of SHR Experimental animals were SHR(180) and SD(90) and they were divided into three groups ; a experimental group1( practice group), a experiment group2(non practice group), and a comparative group (normal group). The experimental group 1 was practicing on a treadmill at 15m/min exercise intensity for 30 minutes a day four times per week for eight weeks. While raising experimental animals, We measured BP for each group once a week, and took the weight of the heart after killing a rat. and then we examined the concentration of ?? and ??, compared, and analyzed them. we have reached the following results. 1. As time passed, BP in the experimental group 1 was almost equal to BP eight weeks ago. BP in the experimental group 2 continued to rise and then showed typical hypertension. 2. The three groups were inclined to increase the weight of their hearts as time passed. However, the experimental group 2 presented the weight of hearts increasing compared with the experimental group1 after eight weeks. 3. In the experimental group 1, and experimental group 2 groups, ?? concentration was but ?? concentration increased as time passed. However, the experimental group1 showed fewer changes than the experimental group 2. 4. The weight of all three groups were inclined to increase as time passed, but it didn't present any noteworthy differences. According to the analysed result of the above experiment, endurannsce exercise becomes an important factor in preventing the raising of BP of SHR, and the hypertrophy of hearts. Key Words : Spontaneously Hypertension Rats, Blood Pressure, Endurance Ecercise

계열별 고등학생집단의 뇌기능특성화 경향에 대한 연구

윤규태,최기수,안의태,고정식,양남길,박경호 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.2

본 연구에서는 계열에 따른 고등학생들의 대뇌반구기능의 특성화 또는 편재화의 경향을 알아보고, 전공분야에 대한 적응력과의 상관관계를 검토하고자 했다. 일반고등학교 인문계열 학생 359명, 자연계열 학생 371명, 음악과 미술전공 학생을 포함한 예능계열 196명, 체육특기자를 포함한 체육계열 학생 151명 등 1,077명을 대상으로 각 계열별, 남녀별, 성적별 고등학생 집단들의 대뇌반구의 특성화, 편재화 경향을 시나가와(품川)질문지법을 이용하여 분석하였으며, 다음과 같은 결과를 얻었다. 1. 인문계열 고등학생의 뇌기능의 편재화 경향은 우뇌형 54.3%, 양쪽뇌형 32.6% 및 좌뇌형 13.1%였다. 남녀별로는 남학생은 우뇌형 62.9% 양쪽뇌형 27.9% 및 좌뇌형 9.5%로 나타났으며, 여학생은 각각 43.7%, 38.6% 및 17.7%로서 여학생이 남학생에 비하여 죄뇌화 경향을 보였다. 2. 자연계열 고등학생의 경우는 우뇌형 56.9%, 양쪽뇌형 29.9% 및 좌뇌형 13.2%로서 인문계열 고등학생과 비슷한 분포를 보였다 이를 남녀별로 구별하여 보면 남학생은 62.2%, 27.1% 및 10.2%, 여학생은 51.5%, 32.5%및 16.0%의 분포를 보여, 역시 여학생의 좌뇌화 경향이 뚜렷했다. 3. 예능계열 고등학생의 경우는 우뇌형 56.1%, 양쪽뇌형 35.2% 및 좌뇌형 8.7%의 분포를 보였으며, 이를 전공별로 세분해서 살펴보면 음악전공학생의 경우 53.7%, 35.5% 및 10.7%로서 전체 평균과 거의 비슷한 분포를 보였으나, 미술전공학생의 경우 60.0%, 34.7% 및 5.3%로서 , 특히 좌뇌형의 경우 음악전공에 비해 절반수준에도 못 미치는 경향을 보였다. 4. 체능계열 고등학생 집단의 경우 우뇌형 50.3%, 양쪽뇌형 37.7% 및 좌뇌형 11.9% 분포를 보였다. 5. 성적별로 보면 일반고등학교 학생 가운데 성적 우수 집단은 뚜렷하게 좌뇌형 경향(25.6% 및 25.0%)을 보였다. 6. 예능계열의 우수집단은 양쪽뇌형의 분포비율(50.0% 및 44.4%)이 특히 높았다. 7. 체육계열의 우수집단은 좌뇌형 분포(21.6%)가 높았다. According to the advanced study on differential theory of brain function, the left hemispheric functions are concerned more on the verbal, logical, sequential and arithmetic abilities, whereas the right hemisphere has characteristics of non-lingual, general, creative and aesthetic abilities. The authors compared the tendency of hemispheric specialization in high school students with different educational condition and facilities. Sinakawa's questionnaire method was the instrument for this study. The results obtained were as follows: Among 1,077 of whole subjects, right hemispheric dominant type was 55.0% (59.1% in male, 51.0% in female), bilateral type was 32.9% (10.6% in male, 35.1% in female) and left hemispheric dominant type was 12.2% (10.4% in male, 13.9% in female). 1. Of the 359 subjects in the field of humanity science, right hemispheric dominant type was 54.3% (62.9% in male, 43.7% in female), bilateral type was 32.6% (27.9% in male, 38.6% in female) and left hemispheric dominant type was 13.1% (9.5% in male, 17.7% in female). 2. Of the 371 subjects in the field of natural science, right hemispheric dominant type was 56.9% (62.2% in male, 51.5% in female), bilateral type was 29.9% (27.1% in male, 32.5% in female) and left hemispheric dominant type was 13.2% (10.2% in male, 16.0% in female). 3. Of the 196 art school students, 56.1% was regraded as right hemispheric dominant type, students majoring music was 53.7%, 35.5% and 10.7%, respectively, whereas the frequency for students majoring find art was 60.0%, 34.7% and 5.3%. 4. In students majoring physical education, 50.3% were shown in right hemispheric dominant type, 37.7% were bilateral type and 11.9% were left hemispheric dominant type. 5. Laterality patterns of students who adapt more successfully to their specific studying fields show following characteristics; Successful students of general high school show pronounced left shift in their laterality pattern, whereas successful students of art school exhibit more bilateral type. And successful students of physical education school show left shift in their laterality patterns.