• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.136-139
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• 2000

In this paper, we use U-Mart that is an agent-based artificial market model. U-Mart is more open than the other artificial market, because In U-Mart, not only computer program agents, but also human agents are able to participate in the market. Therefore, the market in U-Mart gets closer to the real markets and the agents that participate in the market make the complex decision. Moreover we expand to the number of brand to plural. This expansion causes to appear the several strategies to make a profit. As one of this example, we treat the portfolio and confirm the possibility of getting the constancy to make portfolio.

• 한국콘텐츠학회논문지
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• 제8권5호
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• pp.104-112
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• 2008

RFID/USN은 유비쿼터스 사회의 중요한 기반 인프라로서 고려되며 다양한 연구를 통해 실용적인 접목이 시도되고 있다. 특히 u-마트 시스템에서 물류의 입출 재고와 상태 관리를 위한 연구가 진행 중에 있다. 이는 물품 보관 단위인 파렛트에 RFID 태그를 부착하여 입.출고 시의 물품을 식별하고 무선 통신기능을 가진 센서 모듈에 의해 환경 상태 정보를 파악하는 물품의 형태로 이루어진다. 본 논문에서는 RFID/USN 기반의 u-마트 상태 관리 시스템에서 RFID 칩을 이용한 고객 만족 시스템 구성을 제안하고 상품의 상세한 정보를 파악하여 고객에게 실시간으로 정보를 제공하는 이동형 리더기를 제안한다. 그리고 소비의 주체인 고객에게 RFID 칩을 이용한 적절한 제품 정보의 제공과 제어 정보의 제공을 위한 개선 방안을 제안한다.

• East Asian mathematical journal
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• 제21권1호
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• pp.21-26
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• 2005

The purpose of this paper is to show that every generalized Jordan derivation of prime ring with characteristic not two is a generalized derivation on a nonzero Lie ideal U of R such that $u^2{\in}U\;for\;{\forall}u{\in}U$ which is a generalization of the well-known result of I. N. Herstein.

• 한국의상디자인학회지
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• 제5권2호
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• pp.31-46
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• 2003

The purpose of this study was to explore the ways of improving Korean apparel firms' competitiveness by examining the Korea's number one trading partner U.S. apparel industry. Especially, the Los Angeles area apparel industry which is the second largest and the primary market center on the west coast was analysed. The following strategies are suggested to Korean apparel firms to function more effectively in incleasingly competitive U.S. markets: l)Basics can be produced in lower wage countries meanwhile quick turnaround and high quality works can be produced either in Korea or U.S. 2)Manufacturers might try to have direct relationship with powerful retailers who have their own private labels of store-brand lines. 3)Apparel companies can open market showrooms in the California Market Center. For small firms they can contact with independent representatives who receive commissions for showing lines for manufacturers or rent space for showing the lines during market weeks. 4)Apparel firms can contact buying offices to introduce their products to retail buyers. 5)Korean firms can contact Korean-American apparel firms to gain easy access to U.S.Market.

• East Asian mathematical journal
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• 제17권2호
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• pp.225-232
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• 2001

Let R be a prime ring with characteristic not two. U a (${\sigma},{\tau}$)-left Lie ideal of R and d : R$\rightarrow$R a non-zero derivation. The purpose of this paper is to invesitigate identities satisfied on prime rings. We prove the following results: (1) [d(R),a]=0$\Leftrightarrow$d([R,a])=0. (2) if $(R,a)_{{\sigma},{\tau}}$=0 then $a{\in}Z$. (3) if $(R,a)_{{\sigma},{\tau}}{\subset}C_{{\sigma},{\tau}}$ then $a{\in}Z$. (4) if $(U,a){\subset}Z$ then $a^2{\in}Z\;or\;{\sigma}(u)+{\tau}(u){\in}Z$, for all $u{\in}U$. (5) if $(U,R)_{{\sigma},{\tau}}{\subset}C_{{\sigma},{\tau}}$ then $U{\subset}Z$.

• 한국유기농업학회지
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• 제10권3호
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• pp.25-39
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• 2002

This paper aims to provide quite recent information on the organic industry in the U.S. Major focuses are on the development of cultivation and marketing of fresh and processed organic produce and foods, newly enforced certification program, consumers' purchasing behaviors toward organic foods, and social survey results administered to the organic farmers in the U.S. The U.S. recorded 8 billion dollars' sale of organic foods in 2000, which was the largest in the world and showed 23% growth compared to the previous year. Yet the organic industry is still a niche market, occupying merely 1.5% of total food sale amount. The natural foods markets have not been so concentrated in the U.S., but it is changing and a few wholesale mart such as Whole Foods is emerging. Recent introduction of new certification program provide unified and sole standard at the federal level to which every certifier needs to adjust itself in order to be acceredited by the government. According to a social survey, consumers purchase organic foods because they concern about health, they stick to their own modes of life favoring natural foods, and so on. Another social survey shows that most organic farmers sell their produces to wholesalers, distributers, or producer coop, and direct sale to visitors at their own farm comprises of about 8 percent of their organic land.

• East Asian mathematical journal
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• 제18권2호
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• pp.195-203
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• 2002

Let R be a prime ring with characteristic not two and U is a nonzero left ideal of R which contains no nonzero nilpotent right ideal as a ring. For a $(\sigma,\tau)$-derivation d : R$\rightarrow$R, we prove the following results: (1) If d is an endomorphism on R then d=0. (2) If d is an anti-endomorphism on R then d=0. (3) If d(xy)=d(yx), for all x, y$\in$R then R is commutative. (4) If d is an homomorphism or anti-homomorphism on U then d=0.

• Structural Monitoring and Maintenance
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• 제10권2호
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• pp.133-154
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• 2023

Obscured structural members are mostly under-evaluated during condition assessment due to lack of visual inspection capability. Insufficient information about the integrity of these structural members poses a significant risk for public safety. Time domain reflectometry (TDR) is a novel approach in structural health monitoring (SHM). Ordinary coaxial cables "as is" without a major modification are not suitable for SHM with TDR. The objective of this study is to propose a practical and cost-effective modification approach to commercially available coaxial cables in order to use them as a "cable sensor" for damage detection with the TDR equipment for obscured structural members. The experimental validation and assessment of the proposed modification approach was achieved by conducting 3-point bending tests of the model piles as a representative obscured structural member. It can be noted that the RG59/U-6 and RG6/U-4 cable sensors expose higher strain sensitivity in comparison with non-modified "as is" versions of the cables used. As a result, the cable sensors have the capability of sensing both the presence and the location of a structural damage with a maximum aberration of 3 cm. Furthermore, the crack development can be monitored by the RG59/U-6 cable sensor with a simple calibration.

• 한국유통학회지:유통연구
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• 제9권1호
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• pp.47-65
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• 2004

본 사례 연구는 백화점과 할인점 대표 기업들의 수익성을 1999년, 2000년, 2001년 3개년도에 걸친 공시된 회계 정보와 ROIC (return on invested capital) 지표를 이용하여 분석하고 있다. 특히 미국의 대표 백화점과 대표 할인점 업체들과의 업태별 벤치마킹을 시도하였다. 연구 결과 기업 가치를 극대화하기 위해서는 미국의 Wal-Mart와 J.C. Penny의 경우와 같이 자산 회전율과 영업 이익률의 두 가지 지표를 모두 향상시키는 일이다. 그러나 현실적으로 백화점 업체들은 영업 이익률에 보다 초점을 맞추고 있음을 실증적으로 알 수 있었고 우리나라 외국계 할인점 업체들은 진출 초기의 특성으로 저조한 수익성 지표를 보여주고 있었다.

• 응용통계연구
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• 제24권3호
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• pp.477-484
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• 2011

반응/미반응 목표변수를 갖는 모집단에서 관심 목표범주의 빈도가 극히 작을 경우, 즉 희귀할(rare) 경우, 모형 구축을 위한 데이터마트를 형성할 때 반응/미반응 범주 구성비는 구축된 모형의 성능에 영향을 준다. 본 연구는 이러한 점에 착안하여 반응/미반응 범주 구성비와 모형성능의 관련성을 모형평가 통계량에 기반하여 판단한다. 이로써 데이터마트 형성에 이상적인 반응/미반응 범주 구성비를 탐지하려는데 본 연구의 목적을 두고 있다. 또한 일반적으로 목표범주의 빈도가 희귀할 경우, 분할 표본추출에 의하여 희귀사건(rare event)을 과대표본추출(oversampling)하는 것이 일반적이며, 이로부터 기인하는 사후확률에 대한 편향을 조정하게 된다. 본 연구에서는 사후확률 조정방법으로 오프셋(offset) 방법과 가중치 방법(sampling weights)을 적용하고 이를 비교하였다.