• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 제5회 영호남 학술대회 논문집
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• pp.121-125
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• 2003

Time-resolved photoluminescence from InGaN/GaN multi-quantum well structures was investigated for two different shapes of square- and trapezoidal wells grown by metal-organic chemical vapor deposition. To compare to the conventional square well structure with a radiative recombination lifetime of 0.170 nsec, the large value of lifetime of 0.540 nsec from trapezoidal well were found at room temperature. This value is similar to the value for GaN host material indicating no confinement effect of quantum well. Furthermore, the high resolution transmission electron microscopy image provides the In clustering effect in the trapezoidal well structure.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2003년도 추계학술대회
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• pp.113-116
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• 2003

In the recent environment of globalization where fierce competitions exist between manufacturers, SRM(Supplier Relationship Management) plays important role in the strategies of companies, and managements of companies try their best efforts in establishing the strategy to accomplish the innovative relationship between supply chain channels. The structure of the partnerships we develop with not only customers but also suppliers will in many cases determine the degree of success of the relationship. A successful partnership provides an opportunity for shared risk while maximizing the opportunity for mutual success whether it's with supplier. To follow this paper show how SLV(Supplier Lifetime Value) can be used to structure the supplier in automotive part manufacturer, This method of selection is described, and a detailed example of how SLY can be used and allocation of order quantity for the selected suppliers also are provided.

• 산업기술연구
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• 제20권B호
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• pp.213-218
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• 2000

The nearest neighbor query is an important operation widely used in multimedia databases for finding the object that is most similar to a given query object. Most of techniques for processing nearest neighbor queries employ multidimensional indexes for effective indexing of objects. However, the performance of previous multidimensional indexes, which use N-dimensional rectangles or spheres for representing the capsule of the object cluster, deteriorates seriously as the number of dimensions gets higher. This paper proposes a new index structure based singular value decomposition resolving this problem and the query processing method using it. We also verify the superiority of our approach through performance evaluation by performing extensive experiments.

• 한국주거학회논문집
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• 제18권2호
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• pp.11-20
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• 2007

The purpose of this study is to find the apartment Choice and Housing Satisfaction by the Housing Value Segmentation. Survey questionnaires were conducted on 1103 married women from three residential areas in Daegu. Data were analized by SPSS package program. Major findings are the following: Quality oriented type preferred environment oriented and multiple apartment. Safety investment type answered the bases of the information as of sales/model house, real estate office, oral information from relative neighbor. Ostentation negative type is dissatisfied for the present apartment were listed such as inconvenient inner structure and inner space, education environment for children, privacy protection, convenient transportation for the urban area. Convenience educational environment type is dissatisfied for the present apartment were listed such as inconvenient inner structure and inner space, anti sonic materials, education environment for children, privacy protection.

• Transactions on Electrical and Electronic Materials
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• 제4권5호
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• pp.19-23
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• 2003

Time-resolved photoluminescence from InGaN/GaN multi-quantum well structures was investigated for two different shapes of square-and trapezoidal wells grown by metal-organic chemical vapor deposition. To compare to the conventional square well structure with a radiative recombination lifetime of 0.170 nsec, the large value of lifetime of 0.540 nsec from trapezoidal well were found at room temperature. This value is similar to the value for GaN host material indicating no confinement effect of quantum well. Furthermore, the high resolution transmission electron microscopy image provides the In clustering effect in the trapezoidal well structure.

• ETRI Journal
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• 제45권4호
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• pp.704-712
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• 2023

This paper presents a flexible finite-difference technique for analyzing the nonuniform guiding structures. Because the voltage and current variations along the nonuniform structure differ for each segment, this work considers the adaptable discretization steps. This technique increases the accuracy of the final response. Moreover, by applying the singular value decomposition and discarding the nonprincipal singular values, an optimal lower rank approximation of the discretization matrix is obtained. The computational cost of the introduced method is significantly reduced using the optimal discretization matrix. Also, the proposed method can be extended to the nonuniform waveguides. The technique is verified by analyzing several practical transmission lines and waveguides with nonuniform profiles.

• 디자인학연구
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• 제19권1호
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• pp.191-200
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• 2006

디자인 표상은 디자인 요소가 결합된 하나의 통합체로서 분야별 표상의 전형성을 반영하는 것이다. 그리고 디자인 요소는 분야별 표상의 목적과 가치를 반영하는 계열체로서 속성의 범주를 형성하며 표상의 과정에서 선택과 결합이 이루어진다. 디자인 속성 범주의 선택과 결합은 표상의 과정에서 작용하는 주체의 표상 의식에 근거하며 표상의 목적과 가치에 대한 인식의 내용을 반영한다. 그러므로 분야별 표상은 해당 분야에서 요구되는 표상의 목적과 가치에 따른 속성의 구조를 나타내며, 이들이 결합하고 있는 양태에 따른 분야간 차별화가 이루어지는 것이다. 본 연구는 이러한 가정에 대한 사실 검증으로서, 디자인 표상에서 이루어지는 속성 범주의 고려도 측정을 통해 각 분야의 표상을 형성하는 속성 구조의 전형성과 분야간의 차이를 평가하고자 하였다. 연구의 결과, 평가의 대상으로 선정한 산업 디자인, 시각 디자인 그리고 환경 디자인 분야의 표상에 반영된 속성 구조는 전형적인 차이가 있음을 확인하였다.

• 보건행정학회지
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• 제20권2호
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• pp.40-52
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• 2010

Health insurance fees are set by relative value scales and conversion factors. Since 2008 the conversion factor has been classified into 7 according to the provider type, and a separate contract has been made respectively. As such classification of the conversion factor reflects only the different characteristics of providers, however, further classification to reflect the different cost structures of providers is proposed. Cost varies according to the type of not only providers but also services each provider supply. In fact different cost structures of providers are the result of their different services. This study analyzed the cost structure of medical services to propose a new approach to the classification of the conversion factor. This study analyzed the cost structure of medical services using cost data constructed in the revision study of relative value scales. The cost data consist of doctor's fee, support staff's fee, cost of medical equipments, cost of medical supplies and indirect cost. The proportion of each cost component to the total cost was analyzed in terms of service department and service type. 72 service groups are defined in terms of the combination of service department and service type. Through cluster analysis, 72 service groups were reduced into 7 clusters each of which has a similar cost structure. Conversion factor is contracted annually to reflect the change in the cost of providing medical services. So the classification of conversion factor has to be based on the cost structures of medical services, not the characteristics of providers. Service clusters derived in this study can be used as a new classification for health insurance fee contract.

• 한국멀티미디어학회논문지
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• 제9권9호
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• pp.1231-1246
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• 2006

시각적 렌더링 포맷인 HTML은 연관된 정보를 간결하게 표현하기 위하여 테이블을 사용한다. 그러나 HTML은 컴퓨터로 하여금 정의를 처리 및 가공하게 한다는 측면에서 한계를 갖기 때문에 논리적 구조정보의 표현이 가능한 XML 문서로의 변환이 필요하다. 본 논문에서는 웹으로부터 정보를 추출하기 위한 목적의 일환으로 HTML 테이블의 논리적인 구조를 추출하여 XML 문서로 변환하는 효율적인 방법을 제안한다. 제안된 방법은 영역구분과 구조분석의 두 단계로 구성된다. 영역구분 단계에서는 잡음영역을 제거하며 시각적 및 의미적 일관성 검사를 통하여 테이블에 존재하는 속성과 값 영역을 구분한다. 이후 구조분석 단계에서는 구분된 영역에 제안된 테이블 모델을 적용하여 계층구조를 추출하며, 이로부터 XML 문서를 생성한다. 제안된 영역구분 방법의 성능을 평가하기 위하여 1,180개의 테이블을 대상으로 실험한 결과, 평균적으로 86.7%의 정확도를 보여 기존 연구보다 우수하였다.

• Journal of Mechanical Science and Technology
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• 제15권10호
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• pp.1356-1368
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• 2001

In this paper, the model reference adaptive control (MRAC) of a flexible structure is investigated. Any mechanically flexible structure is inherently distributed parameter in nature, so that its dynamics are described by a partial, rather than ordinary, differential equation. The MRAC problem is formulated as an initial value problem of coupled partial and ordinary differential equations in weak form. The well-posedness of the initial value problem is proved. The control law is derived by using the Lyapunov redesign method on an infinite dimensional filbert space. Uniform asymptotic stability of the closed loop system is established, and asymptotic tracking, i. e., convergence of the state-error to zero, is obtained. With an additional persistence of excitation condition for the reference model, parameter-error convergence to zero is also shown. Numerical simulations are provided.