• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.348-357
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• 2006

Ground Vibration Tests (GVT) are needed on au new aircraft types and as part of certification. Its first objective is to verify models used for the calculation and prediction of the dynamic behavior of the structure. The main objectives of this paper are to introduce 'the integrated approach of dynamic testing for aerospace structure' in detail and 'The research projects in which LMS participated in aerospace structural dynamic area'

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 B
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• pp.816-818
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• 1998

In this paper, a highly reliable communication network for DCS (Distributed Control System) in nuclear power plant is designed. The structure and characteristics of DCS in nuclear power plant is briefly explained. The features needed for a communication network for DCS in nuclear power plant is described. According to the above features, a layer structure for the communication network is determined and each layer is designed in detail. Accuracy of the model was evaluated by computer simulation.

• 대한전기학회논문지
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• 제41권6호
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• pp.607-614
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• 1992

A continuous variable structure system control for a DC servomotor tracking controller is proposed to alleviate the chattering problems. The stability property of the proposed algorithm is analyzed in detail. The prescribed tracking error is guaranteed under load variations based on the stability analysis. Through the comparative simulations between the proposed algorithm and the conventional VSS, the effectiveness of the proposed algorithm is proved.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2006년도 추계 학술대회논문집
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• pp.26-27
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• 2006

Characteristics of spatial structure of particle clusters are investigated by using the flow field data obtained from three-dimensional numerical simulations. Eulerian/Lagrangian approach with two-way coupling is applied and individual particle-particle collisions are taken into account by using the hard-sphere model. More than 16 million particles are traced in the maximum case. The results show that the cluster is consisted from the multiple-spatial scale components while the low wave-number, hence the large-scale structure, is dominant. Three-dimensional structure reconstructed from the low-pass filtered data enables us to investigate the essential dynamics of particle clusters in detail.

• Steel and Composite Structures
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• 제16권3호
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• pp.289-303
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• 2014

In recent, development of construction and design technology gives taller, larger and heavier steel framed structures. With the tendency of increasing high-rise building, this study is strongly related to structural system, one of significant components in structural design. This study presents an innovative structural system, with high performance steel material, diagrid. Its detail, structural analysis, and structural experiments are all included for the development of new structures.

• 한국멀티미디어학회논문지
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• 제5권4호
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• pp.361-371
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• 2002

GIS에 있어 효율적인 액세스 기법은 가장 중요한 요구사항 중 하나이다. 레벨별로 상세화된 공간 데이터를 사용하게 되면 한번에 모든 데이터를 검색할 필요가 없어 효율적인 공간 데이터 검색이 가능해진다 데이터 검색을 위한 기존의 공간 인덱싱 기법은 이러한 레벨별로 상세화된 공간 데이터를 효율적으로 다루지 못한다. 이를 위해 레벨별로 상세화된 공간 데이터를 위한 공간 인덱싱 기법이 알려졌다. 그러나 이 기법들은 단순화와 선택 연산자를 거친 몇 가지 종류의 레벨별로 상세화된 데이터만을 지원한다는 문제점을 가진다 이러한 문제점들을 해결하고자 본 논문에서는 모든 종류의 레벨별로 상세화된 공간 데이터를 지원하면서 검객이 효율적으로 이루어지는 새로운 공간 인덱싱 기법을 제안한다. 제안된 기법은 레벨별로 각각의 인덱스 구조가 한 개의 인덱스 구조로 통합된다. 실험 결과는 제안된 기법이 데이터 중복이 발생하지 않으면서도 검색 성능이 우수함을 보인다.

• 한국식물학회:학술대회논문집
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• 한국식물학회 1996년도 식물학심포지움 식물호르몬과 신호전달
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• pp.10-17
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• 1996

Fern gametophytes are a good model system to study plant morphogenesis, because of their simple organization and various photocontrolled responses. We studied fern photomorphogenesis including chloroplast photoorientation using Adiantum gametophytes to analyze signal transduction pathways of plant photomorphogenesis. Chloroplast photoorientation will be shown in detail and molecular structure of fern phytochromes and blue light absorbing pigments will also be discussed.

• 한국정밀공학회지
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• 제19권6호
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• pp.104-108
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• 2002

Sandwich plate structure is widely used in various fields of industry due to its excellent strength and stiffness compared with weight. In this paper, the mechanical behavior of sandwich plate structure with honeycomb core considering buckling is investigated in detail. The focus of the analysis is to evaluate strength and stiffness of the plate structure with critical stress, natural frequency, and mode shapes. The results of this investigation are obtained from detailed finite element analysis for various parameters, such as length, height ratio, and thickness ratio of honeycomb core.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.702-705
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• 1997

Sandwich plate structure is widely used in various fields of industry due to its excellent strength and stiffness compared with weight. In this paper, the mechanical behavior of sandwich plate structure with honeycomb core considering buckling is investigated in detail. The focus of the analysis is to evaluate strength and stiffness of the plate structure with critical stress, natural frequency, and mode shapes. The results of this investigation are obtained from detailed finite element analysis for various parameters, such as length, height ratio, and thickness ratio of honeycomb core

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제23권2호
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• pp.175-196
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• 2009

본 연구는 수학교과의 수준별 교수-학습 자료의 이론적 뒷받침에 관련된 문헌연구로, Ziv의 교수학적 자료에 제시된 하수준과 중수준에 해당하는 교수-학습 자료들을 수학문제의 내적구조라는 관점에서 분석하여, 하수준 문제들의 특징들, 중수준 문제들의 특징들을 조사하였다.