• Journal for History of Mathematics
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• v.30 no.3
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• pp.137-162
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• 2017

The Chinese algebraic method, the tian yuan shu, was developed during Song period (960-1279), of which Li Ye's works contain the earliest testimony. Two 18th century editors commentated on his works: the editor of the Siku quanshu and Li Rui, the latter responding to the former. Korean scholar Nam Byeong-gil added another response in 1855. Differences can be found in the way these commentators considered mathematical objects and procedures. The conflicting nature of these commentaries shows that the same object, the quadratic equation, can beget different interpretations, either a procedure or an assertion of equality. Textual elements in this paper help modern readers reconstruct different authors' understandings and reconsider the evolution of the definition of the object we now call 'equation'.

• Korean Journal of Environmental Biology
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• v.26 no.2
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• pp.115-120
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• 2008

Earlier we have described new water-soluble Ag- and Zn-derivatives of tetrachloride meso-tetra (4-N-oxiethylpyridyl) porphyrin (TOEtPyP) as potential anticancer drugs. In this work the effect of one of these metal porphyrins, TOEtPyP Ag, on the cell population kinetics was studied in vitro using morphological and biochemical techniques. The results suggested that TOEtPyP Ag action consisted in the simultaneous suppression of the cell growth and activation of the cell death. About 40% of the cells were shown to die via apoptotic pathway. So, the porphyrin studied may be attributed to inducers of both necrotic and apoptotic processes. The results obtained support our previous assertion that TOEtPyP Ag may be considered as a potential chemotherapeutic agent.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.7
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• pp.863-871
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• 1999

While Logic Based Expert System (LBES) has a merit of rapid and complete inference, it also has a defect of huge knowledge base. Hierarchical LBES (HLBES) replaces the assertion time inference of LBES with the multi-level logic minimization procedure, and it guarantees smaller knowledge base comparing with LBES. This paper has two contributions. The one is proposing so-called fact-minimization procedure which reduces not only the number of facts or measured events but also the size of knowledge base dramatically. The other contribution is application of HLBES and the proposed fact-minimization to the fault diagnosis of power system. The application is successfully performed in the example with the transmission system which takes 72 goals and 352 facts.

• Korean Journal of Child Studies
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• v.27 no.4
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• pp.103-116
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• 2006

This study examined gender differences of the effect of playfulness on the social skills of young children. The subjects were 242 4- to 6-year-old children at five nursery schools and kindergartens. Results showed that playfulness influenced social skills of young children. In particular, young children's playfulness was a more effective variable of assertion than self-control, cooperation and responsibility. Cognitive spontaneity and social spontaneity were the most effective variable of social skills. Playfulness had variable influences on social skills by gender: Among boys, playfulness was a less effective variable of cooperation than the other variables of social skills. Among girls, playfulness was a less effective variable of self-control than other variables of social skills.

• Journal of Ginseng Research
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• v.30 no.3
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• pp.158-164
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• 2006

The American ginseng is getting popular in the world market with cooling effects. This paper study history of the cooling effect of American ginseng. Most references include one's assertion on the cooling effect of American ginseng based on the old chinese believe. However, American ginseng was discovered in 1716 and export to China from mid 18 century. Concerning on the time period for clinical demonstration to get people's believe, it is not sufficient to conform the cooling effects of American ginseng. That is why the American ginseng was sold as an inferior goods compare oriental ginseng until mid 1970s. United State FDA also does not certify any effectiveness of Ginseng yet. However, it is important to study on the American ginseng because of rapid growth in the world ginseng market.

• Korean Journal of Child Studies
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• v.30 no.5
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• pp.167-178
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• 2009

The purpose of this study was to look into the meaning of kindergarten experiences of first graders with the use of phenomenological research. The participants of this study were 10 elementary school students. Through eleven interviews per person and journal writings, the voice of participants was condensed into three categories : (1) Kindergarten life was new and delightful; (2) they were limited in assertion of their rights; and (3) they experienced separation and longing. We should understand children's experience by their explanations and give consideration to children not as objects but as subjects. By doing so, we can provide more meaningful experiences to children in kindergarten.

• Journal of the Korean Home Economics Association
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• v.46 no.8
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• pp.73-84
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• 2008

The aim of this study was to identify perception discrepancies related to organizational effectiveness in childcare center. To achieve this, managers and teachers were treated as two different subjects. Statistical analysis showed that perception influences differed between managers and teachers. Managers were affected by organizational characteristics and director of the organization. On the other hand, teachers were affected by organizational characteristics and the manager of the child-care center. It was established that the different view points of managers and teachers led to a situation where a manager perceived organizational effectiveness in a more holistic and positive light compared to teachers. It is our assertion that in order to run a child-care center efficiently, it is very important to fortify the ability and authority of managers.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.7
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• pp.1226-1231
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• 2010

This paper looks at the influence of Financial Transmission Rights (FTRs) on the market value(Social Welfare; SW) in the competitive electricity market. The transmission line constraints make it difficult to compute the Nash Equilibrium (NE) due to causing a mixed strategy NE instead of a pure strategy NE. Computing a mixed strategy is more complicated in a multi-player game. The aim of this paper are to compute a mixed strategy NE and analyze SW in power transaction with FTRs. This paper introduces a formula and a technique for solving NE of multi-player game with FTRs. In addition, it analyzes the influence of holding of FTRs by generation company on SW and it proposes the SW at NE is influenced by Power Transfer Distribution Factor (PTDF) where holder of FTRs are located. The assertion is verified by calculating the mixed strategy utilizing the Cournot model widely used for studies on FTRs.

• Annual Conference of KIPS
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• 2002.11b
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• pp.961-964
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• 2002

일반적으로 Web Service란 표준 인터넷 프로토콜을 이용하여 외부에 노출된 비즈니스 기능을 프로그램적으로 접근하는 방식으로 간단한 메소드 호출뿐만 아니라 복잡한 비즈니스 프로세스까지 수행이 가능하고, 한번 배포된 Web Service는 인터넷으로 접근할 수 있는 곳이면 어디서든지 접근 및 호출이 가능하다. 현재 Web Service 구현에 있어 최대의 당면 과제는 보안문제로서. 인터넷을 이용해서 이동하고 있는 많은 양의 데이터를 안전하게 지킬 수 있는 방법의 모색에 초점이 맞추어져 있다. 이러한 보안 문제를 해결하기 위해 SAML(Security Assertion Markup Language), XKMS(XML Key Management Specification), XAML(Transaction Authority Markup Language), BTP(Business Transaction Protocol), XLANG 등을 이용한 여러 가지 방법이 시도되고 있다. 본 논문에서는 SAML을 이용한 보안 솔루션을 분석하고, SAML을 이용하여 SSO, Back Office Transaction 등의 어플리케이션을 구축하여 시뮬레이션 결과를 보이고자 한다.

• ETRI Journal
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• v.42 no.5
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• pp.734-747
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• 2020

Using 23 867 standard essential patents claimed for three different wireless telecommunication standards (GSM, WCDMA, and LTE), this research examined the difference in technological importance and breadth of patents between practicing and non-practicing entities. We discovered that compared to manufacturers and service providers, organizations who do not appropriate innovation-derived profits directly from product or service markets tended to have relatively low-quality but broadly scoped technologies for the claimed standard essential patents. These relationships between the characteristics of inventions and the organizational types were consistently held across different generations of wireless standards as indicated by regressions run for each sample split by generation. Furthermore, the theory and policy implications of our results and arguments are presented herein.