• 한국식품영양과학회지
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• 제24권1호
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• pp.67-73
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• 1995

Effects of tocopherols and $\beta$-carotene on the oxidation of the solid model system of a free fatty acid mixture (64.5% of linolic acid ; 26.4% of oleic acid ; 5.0% of palmitic acid) with tocopherols and $\beta$-carotene were studied. $\alpha$-tocopherol revealed an antioxidant activity at the concentration below 0.05%, however, it showed a prooxidant activity when the concentration was higher than 0.05%. The antioxidant activity of ${\gamma}$ -tocopherol was not affected by the concentrations in the range of 0.01~0.10% in the model and ${\gamma}$-tocopherol showed higher antioxidant activity than that of $\alpha$-tocopherol. It seemed that $\alpha$-tocopherol was unstable compared to ${\gamma}$-tocopherol during oxidation. $\beta$-carotene showed a weak antioxidative activity at the initial stage of this system while $\beta$-carotene showed a prooxidant activity in the presence of tocopherol. $\beta$ -carotene was highly susceptible to autoxidative degradation during oxidation.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제6권2호
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• pp.75-84
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• 2002

After entering an elementary school, in fact, a number of children regard mathematics as one of very difficult subjects because of its abstractiveness. This is caused by the fact that their basic thinking power is not yet formed or they can not understand the special quality of mathematics. So this article emphasizes the need to build up the higher logical thought and a basic mathematical concept at the lower grade elementary school stage in which the loaming activity on mathematics begins in earnest, that is, at the stage before having an experience on the calculating activity using numbers. But at present the lower grade elementary school students in our country do not understand the special quality of mathematics composed of a various symbolic system and lay stress upon mathematics learning attached to the calculative activity. In order to make the right mathematical concept of the lower grade elementary school, the basic knowledge and ability as follows is sure to be formed. 1) the foundational logical manipulation activity and knowledge 2) the using ability of the sign and symbolic system At the stage on which mathematics learning activity begins, it is a very important task to make the right concept of the abstractive math and nurse the capability for finding mathematical relations covered under the sign system through the continuos loaming activity on . Through the basic logical manipulation activity and the game activity of sign for lower grade elementary school students mentioned in this article, they can not only foster the higher level logical thinking power and the foundational calculative ability but also bring up the interest on the activity of establishing a new problem solving strategy.

• 대한의생명과학회지
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• 제11권2호
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• pp.211-219
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• 2005

Trigeminovascular system plays an important role for the cerebral memodynamics. The aim of this study was to investigate the alterations in cerebrovascular reactivity by trigeminovascular system injury in rats. Trigeminovascular system of male Sprague-Dawley rats was injured by either denervation of nasocilliary nerve or neonatal capsaicin treatment. Trigeminovascular system was stimulated by controlled hemorrhagic hypotension or somatosensory (whisker) stimulation. Changes in regional cerebral blood flow (rCBF) and pial arterial diameter were continuously measured by laser-Doppler flowmetry and videomicroscopy, respectively. Nitric oxide synthase (NOS) activity in cerebral cortex was determined by measuring the conversion of $L-^3H-arginine\;to\;L-^3H-citrulline$. Cyclic GMP levels in cerebral cortex and pial artery were determined using the cyclic GMP $^{125}I$ scintillation proximity assay system. rCBF autoregulation was impaired or almost abolished by trigeminovascular system injury. rCBF response to whisker stimulation was significantly attenuated by trigeminovascular system injury. NOS activity as well as cyclic GMP level in cerebral cortex and pial artery were significantly reduced in the group of trigeminovascular system injury. These results suggest that trigeminovascular system injury causes prominent alterations in cerebrovascular reactivity, and that NO, which is generated by neuronal NOS in the trigeminovascular system, is implicated in the regulation of rCBF.

• 보건행정학회지
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• 제8권2호
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• pp.88-109
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• 1998

The main purpose of this study is to compare the traditional cost system and ABC(Activity Based Cost) system of clinical laboratory department in a hospital. The study subject was 296 services in clinical laboratory from March, 1997 to August, 1997. In a new costing system, cost for a lab test consist of direct cost element, activity based cost element, and allocated common cost element. In a traditional cost system, cost elements included direct cost element and indirect cost allocated based on test volumes The major findings of this research were as follows. 1. In the application of ABC system, total cost was analyzed as follows. Direct cost was 39.3% of total cost. Activity cost and allocation were 20.9% and 39.8%, respectively. The results of analysis to use traditional cost system were as follows. Direct cost was 39.3% and it was as same as the result of direct cost of ABC system. Indirect cost was 60.7%. 2. Activities of clinical laboratory of subject hospital were registration, pre-test operation, test, test result handling, delivery, culture, post-test operation, technical support, management support, and educational support. 3. The differences of the case of higher number of test case being carried out, the cost of ABC system was lower than the cost of traditional cost system. Otherwise in the case of lower number of test case being carried out, the rests have not been appropriately evaluated, and effective management were needed in clinical laboratory.

• 시큐리티연구
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• 제4호
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• pp.319-341
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• 2001

Most of protecting security activity is carried out by manpower partly by security equipment. The protecting security market and the area of protecting security activity is increasing in spite of change of economic and social environment situation. For more effective protecting security activity, the coordination of electronic equipment and manpower is required. So some application method is suggested throughout the thesis, which is especially focused on new approaching method. The integration of intrusion detecting system, C.C.TV system and Access control system is introduced for general application in chapter III, and some application systems are proposed for protecting security activity in chapter IV. But the security equipment is only aid for manpower, so manpower and equipment should be coordinated well.

• 한국경영정보학회:학술대회논문집
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• 한국경영정보학회 2007년도 추계학술대회
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• pp.123-128
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• 2007

It has been argued that Enterprise systems (ES) implementations are overshadowed by a high failure rate despite their promised benefits. One of the commonly cited reasons for ES implementation failures in the context of mandatory use is end-user's unwillingness or sabotage to adopt or use systems. Considering that the appropriate management of expectations may play an important role in making positive behavior toward newly implemented systems, this study examines the effect of outcome expectations on the system use activity in the mandatory use context of information systems from the Social Cognitive Theory perspective. Structural equation model analysis using LISREL 8.7 provides significant support for the proposed relationships. The empirical results suggest that outcome expectations and user satisfaction have positive effects on system use activity conceptualized by immersion, reinvention, and learning. Theoretical and practical implications of the study shed some light on how to improve system use activity in the mandatory use context of information systems.

• Journal of Ginseng Research
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• 제11권1호
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• pp.24-31
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• 1987

We studied a assay method on the measurement of superoxide dismutase (SOD Superoxide : superoxide oxidoreductase, EC. 1. 15. 1. 1) activity with photoreduced flavin and nitroblue tetrazolium (NBT) as superoxide (${O_2}^{-}$) source and detector, respectively. The $\Delta$E (1000 ng SOD$.$$min.)^{-1}$ of photoreduced flavin-NBT system was 0.08, whereas that of xanthine-xanthine-cytochrome system used broadly in experiments was 0.014. Therefore, the new method was regarded more simple and utilizable than xanthine-xanthine cytochrome system method. In the present paper, we also carried out to investigate the SOD activity and isozyme pattern for the parpose of study of leaf-burning disease in ginseng (Panax ginseng C.A. Meyer) leaves.

• 한국지능시스템학회논문지
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• 제3권1호
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• pp.23-28
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• 1993

Activity structures are a set of functional structures which may be used to provide a uniform framework for the description of information processing systems. The interaction of some aspects of activity structures is discussed. Intelligent systems, a subset of information handling systems, are the primary emphasis of this work. An extension to the functional structures of the activity structures is proposed. The proposed structure is a met a-structure which affects most elements of an intelligent system. The structure is concerned with describing the way uncertainty in an environment is handled by a system. An example is given which shows the importance of describing the uncertainty handling method(s) of an intelligent system.

• 한국컴퓨터산업학회논문지
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• 제6권3호
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• pp.551-558
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• 2005

OMG가 UML 액티비티 다이어그램에 대한 텍츄얼한 시멘틱을 제공하지만 정확한 시멘틱의 부족으로 인하여 모호해지는 단점이 있다. OMG의 UML 액티비티 다이어그램이 제공하는 가이드로는 워크플로우 시스템의 정확한 시멘틱을 제공하지는 못한다. 이에 본 논문에서는 대안적인 방법으로 ASM을 사용하여 UML 액티비티 다이어그램의 정형화를 제시한다. 또한 워크플로우 시스템의 특성에 맞춰 ASM 시멘틱을 확장한다.

• 생명과학회지
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• 제13권6호
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• pp.799-804
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• 2003

천연물에 포함되어 있는 에스트로겐 효과를 가지는 성분의 생체 내에서의 직접적인 효과를 검정하기 위하여, 에스트로겐 수용체를 발현하는 것으로 알려진 인체 유방암 세포주 MCF7에 에스트로겐에 반응성을 나타내도록 고안된 CAT 리포터 플라스미드를 도입한 in vitro 검출시스템을 사용하여 에스트로겐 활성을 측정하였다. 이미 여러 분야에서 그 기능성의 연구가 활발히 진행되고 있는 광합성 조류인 스피루리나(spirulina)와 파래 등의 해양식물을 대상으로 에스트로겐 반응 리포터 시스템을 이용하여 에스트로겐 활성을 측정하였다. 그 결과, 스피루리나 에탄올 추출물의 CAT 활성은 $500\mug/ml\; 와\; 50 \mug/ml$의 농도에서 표준물질인 $17\beta-estradiol$의 농도 $10^{-8}$ M과 비슷한 정도의 에스트로겐 활성 효과를 나타내었고, $5\mug/ml$의 농도에서는 표준물질인 $17\beta-estradiol$의 농도 $10^{-10}$ M과 비슷한 정도의 에스트로겐 활성 효과를 나타내었다. 하지만 파래 추출물의 경우에는 에탄올을 처리한 대조군과 비교하여 유의한 CAT활성 변화를 나타내지 않았다 한편, 불가사리와 새우 등의 해양동물을 대상으로 한 실험에서는 에탄올을 처리한 대조군과 비교하여 유의한 CAT 활성 변화를 나타내지 않았다. 이 연구 결과로 광합성 조류인 스피루리나에 에스트로겐 활성을 효과적으로 나타내는 생리활성성분이 포함되어 있을 수 있다는 가능성을 확인하였다.