• Journal of the Korea institute for structural maintenance and inspection
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• v.22 no.1
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• pp.167-175
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• 2018

This research deals, The characteristics of mechanics and behavior of the tube structural systems, It has been investigated and considered conventional theory and case models, It has shown the suitability, The best location, And optimal shape of the unit module system, Considered variables materials of stiffness increase and decrease in hybrid tube structural systems this study carried out adapting analysis of statistical concepts. In a concrete way, This study exams the effect of reducing horizontal displacement and the shear lag phenomenon, Also, The purpose of this study is to utilize the basic data on the design and study of future high-rise hybrid structural system using this research. As a result, The framed- tube structural system does not effectively cope with horizontal behavior of high-rise buildings, The results of using varying material tested resistance factors and lateral loads in hybrid tube structural system, When each material is compared Bracing material is identified as a key factor in lateral behavior. In a ratio of material quantity framed-tube structural system, The level of sensitivity affecting the horizontal displacement is greater then the beam's column, In case of braced tube structural system, Braced appeared to be most sensitive in comparison of material quantity ratio in columns and beams.

• Journal of Aerospace System Engineering
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• v.16 no.1
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• pp.81-85
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• 2022

In this study, we conducted a structural design and analysis of air intake of aircraft engine using composite materials. First, an investigation on structural design requirement of target structure was carried out. The distributed pressure load and acceleration condition was applied to structural design. To evaluate the structural design result, finite element analysis was carried out. The stress, deflection and buckling analysis for structural safety evaluation was performed. Finally, it was confirmed that the air intake through structural analysis is safety.

• Proceedings of the Korean Society for Information Management Conference
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• 2001.08a
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• pp.177-180
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• 2001

복합명사의 효율적인 분석은 정보검색 시스템의 성능 향상에 중요한 영향을 미친다. 한국어에서는 복합명사가 다양한 구문적 유형으로 표현된다. 표면적으로 동일하게 표현된 복합명사일지라도 의미적으로는 서로 다르게 나타내거나 여러 개의 단위명사로 분리될 수가 있다. 이러한 문제를 해결하기 위해서는 복합명사를 구성하는 단위명사간의 의미적 결합관계를 올바르게 파악하는 것이 무엇보다도 중요하다. 본 논문에서는 의미적 구문관점에서 복합명사의 표층구조와 심층구조간의 의미관계를 기반으로 복합명사 분석시 적용할 수 있는 의미규칙을 도출하는데 있다.

• Composites Research
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• v.13 no.1
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• pp.40-49
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• 2000

The objective of this research is to develop the impact monitoring techniques providing impact identification and damage diagnostics of smart composite laminates susceptible to impacts. This can be implemented simultaneously by using the acoustic waves by the impact loads and the acoustic emission waves from damage. In the previous research, we have discussed the impact location detection process in which impact generated acoustic waves are detected by PZT using the improved neural network paradigm. This paper describes the implementation of time-frequency analysis such as the Short-Time Fourier Transform (STFT) and the Wavelet Transform (WT) on the determination of the occurrence and the estimation of damage.

• The magazine of the Korean Society for Advanced Composite Structures
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• v.4 no.3
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• pp.10-16
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• 2013

• Journal of the Earthquake Engineering Society of Korea
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• v.7 no.5
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• pp.93-102
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• 2003

An optimal design method for hybrid structural control system of building structures subject to earthquake excitation is presented in this paper. Designing a hybrid structural control system may be defined as a process that optimizes the capacities and configuration of passive and active control systems as well as structural members. The optimal design proceeds by formulating the optimization problem via a multi-stage goal programming technique and, then, by finding reasonable solution to the optimization problem by means of a goal-updating genetic algorithm. In the multi-stage goal programming, design targets(or goals) are at first selected too correspond too several stages and the objective function is th n defined as the sum of the normalized distances between these design goals and each of the physical values, that is, the inter-story drifts and the capacities of the control system. Finally, the goal-updating genetic algorithm searches for optimal solutions satisfying each stage of design goals and, if a solution exists, the levels of design goals are consecutively updated to approach the global optimal solution closest too the higher level of desired goals. The process of the integrated optimization design is illustrated by a numerical simulation of a nine-story building structure subject to earthquake excitation. The effectiveness of the proposed method is demonstrated by comparing the optimally designed results with those of a hybrid structural control system where structural members, passive and active control systems are uniformly distributed.

• Annual Conference of KIPS
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• 2004.05a
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• pp.633-636
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• 2004

웹 서비스는 이질적인 응용 시스템들 사이의 연동 및 통합을 위한 표준화된 수단을 제공한다. 본 논문에서는 기존 웹 서비스들을 이용하여 정의되는 복합 웹 서비스를 효율적으로 실행하기 위한 방안으로서 사용자 에이전트를 이용한 분산 처리 시스템 구조 및 처리 방법을 제안한다. 본 시스템은 웹 서비스들의 통신 QoS 및 복합 웹 서비스의 부하 등을 고려하여 복합 웹 서비스의 호출 및 통합 작업을 사용자 에이전트에게 동적으로 위임하여 분산 처리함으로써 복합 웹 서비스의 성능 및 가용성을 향상시킨다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04b
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• pp.76-78
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• 2002

최근 XML 문서는 여러 분야의 시스템에서 교환 표준으로 자리 잡고 있다. 의료 사업 분야에서도 병원간 자료를 전송을 하는데 XML을 사용하는 것이 유통하며, HL7에서도 병원 간 외부 교환 표준으로 XML 문서를 선정하였다. 교환 매개인 XML 문서는 DTD를 이용하여 유효성을 검증할 수 있는 있으나, DTD는 구조 표현과 데이터 형식지원의 한계로 인하여 복합 구조치 의료 데이터를 표현하기에 부족한 점이 있다. 병원정보교환시스템 HIES는 기존 병원 내의 시스템 구조론 유지한 채 병원 내 진료과 간이나 외부 병원 사이에 의료 데이터를 전산 공유할 수 있는 시스템으로, 대부분 복합구조의 의료 데이터를 전송하게 된다. 본 논문에서는 XML DTD 기반으로 구축되었던 HIES를 XML Schema를 이용하여 확장함으로써, 전송 문서의 내부 구조 변경, 정보 공유 관리자 및 동적 스키마 처리, 정보 보안 분야에서 얻는 이점을 보인다

• 한국신재생에너지학회:학술대회논문집
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• 2006.06a
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• pp.543-546
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• 2006

최근 여러 연구에서 다양한 종류의 멀티 모드 하이브리드 동력 전달계가 제안되고 있다. 멀티모드 동력전달계는 두 개 이상의 다른 유성기어식 하이브리드 시스템으로 이루어져 있으며 클러치를 사용하여 각 상황에 유리한 유성기어 시스템을 사용하여 주행한다. 각 유성기어 시스템의 단점들을 보완할 수 있기 때문에 단일 모드를 사용하여 주행했을 때보다 여러 면에서 높은 성능을 보인다. 일반적으로 유성기어식 하이브리드 시스템은 크게 입력, 출력, 복합 분기식의 세 가지 종류로 나눌 수 있는데 이 논문에서는 입력 및 복합 분기식 구조의 특징을 분석해 보았다. 또한 시뮬레이션을 통해 입력, 복합 분기식 구조를 사용하여 듀얼 모드를 구성하였을 때 단일 모드와 비교하여 어느정도의 성능을 보이는지 알아보았다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.18 no.3
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• pp.227-243
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• 2005

This paper presents a hybrid control system combining lead rubber bearings and hydraulic actuators for seismic response control of a cable stayed bridge. Because multiple control devices are operating, a hybrid control system could improve the control performances. However, the overall system robustness may be impacted negatively by additional active control devices. Therefore, a secondary on-off type controller according to the responses of lead rubber bearings is combined with LQG algorithm to improve the controller robustness. Numerical simulation results show that control performances of the hybrid system controlled by an on off type LQG algorithm are improved compared to those of the passive and active control systems and are similar to those of performance oriented hybrid system controlled by a LQG algorithm with the similar peak and normed control forces. Furthermore, it is verified that the hybrid system with an on-off type LQG controller is more robust for stiffness matrix perturbation than conventional hybrid control of system, and there are no signs of instability in the overall system. The proposed control system also maintains the control performance under not only the design earthquakes but also the other earthquakes. Therefore, the hybrid control system using on-off type LQG algorithm could be proposed as an improved control strategy for seismically excited cable-stayed bridges containing many uncertainties.