• 전력전자학회:학술대회논문집
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• 전력전자학회 2018년도 전력전자학술대회
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• pp.436-437
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• 2018

This paper describes the structure and design of a modular DC/DC converter for connecting DC sources such as battery, solar cell, etc. to DC distribution network. The modular converter structure of IPOS type and the optimal design and implementation of the unit converter cell are discussed.

• 대한건축학회논문집:구조계
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• 제35권2호
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• pp.29-36
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• 2019

Modular construction has benefits such as short construction duration and high productivity owing to the production in factory and owing to simultaneous on-site work. However, rework occurs in modular construction and the rework affects the efficiency of modular construction. The almost of causes of rework are exist in design process. To reduce the cause of rework, the information flow of the design process should be managed and the plan to reduce rework should be included. However, the modular construction has complex process because of impeded unit production so it is hard to manage the information flow in design process. Moreover, when the plan to reduce rework is included, the design process will be more complicated. Therefore, the objective of this research is to suggest the design process including the rework reduction plan and to alleviate the complexity of design process by using Dependency Structure Matrix(DSM). By using DSM, the iteration and feedback in design process is reduced and it can be expected that rework in modular project can be reduced by using suggested design process.

• 디지털융복합연구
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• 제17권11호
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• pp.225-232
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• 2019

본 연구는 재난 상황 발생 후 이재민들에게 임시 주거용 공간을 손쉽게 제공하기 위한 임시 주거용 프리패브 모듈라 구조를 제안하기 위해서 진행하였다. 이를 위해 관련 디자인 개념 및 실행을 위해 국내에 등록된 조립식 구조물이나 프리패브 구조와 관련된 다양한 특허를 검색하고 수집하였으며, 이를 특성별로 분류하였다. 결과적으로 임시 주거용 프리패브 모듈라 구조의 공간은 "확장성", "조립 및 해체의 용이성", "빌트인 구조", 그리고 "에너지 효율성"과 같은 추가적인 주요 요인에 대해서도 고려해야 하며, 각 사례는 "세부 조립 모듈형", "모듈형 확장형", "공간 유닛 확장형"의 3가지의 형식으로 구분되었다. 향후 연구에서는 해외 특허를 대상으로 다양한 사례를 수집하고 분석할 예정이며, 이를 통해 가능한 낮은 생산 단가로 양산 및 제공할 수 있도록 구체적인 구현 방법에 대해서도 제안하고자 한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.471-475
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• 2007

Design equations of coupling plates, which connects floor beam of the upper modular unit and overhead beam of the lower one in order to improve serviceability in vibration, are proposed. End conditions of the coupled beams is semi-rigid and the optimal location of the coupling plates are assumed. Rotational constraints for both ends of the coupling plate modeled with beam elements are released and flexibility method is applied to obtain deflection equations of the coupled beam. Proposed equations are defined using the flexibility of the coupling plate, of which size can be determined inversely. Based on numerical analysis, coefficients of the design equations are calibrated and the revised equations are verified to be useful in the design of the coupled beam.

• 대한건축학회논문집:구조계
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• 제34권3호
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• pp.19-28
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• 2018

Key factors that ensure competitiveness of modular unit include consistent high quality and connection condition that ensures high structural performance while minimizing the overall scale of the on-site process. However, it is difficult to evaluate the structural performance of the connection of modular unit, and its structural analysis and design method can be different depending on the connection to its development, which affects the seismic performance of its final design. In particular, securing the seismic performance is the key to designing modular systems of mid-to-high-rise structure. In this paper, therefore, the seismic performance of the modular system with bracket-typed fully restrained moment connections according to stiffness and the shapes of various connection members was evaluated through experimental and analytical methods. To verify the seismic performance, a cyclic loading test of the connection joint of the proposed modular system was conducted. As a result of this study, theoretical values and experimental results were compared with the initial stiffness, hysteresis behavior and maximum bending moment of the modular system. Also, the connection joint was modeled, using the commercial program ANSYS, which was then followed by finite element analysis of the system. According to the results of the experiment, the maximum resisting force of the proposed connection exceeded the theoretical parameters, which indicated that a rigid joint structural performance could be secured. These results almost satisfied the criteria for connection bending strength of special moment frame listed on KBC2016.

• 한국공간구조학회:학술대회논문집
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• 한국공간구조학회 2008년도 춘계 학술발표회 논문집
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• pp.43-48
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• 2008

본 논문은 유닛 모듈러를 구성하는 주구조체인 각형강관 기둥과 냉간성형 LEB C-형강 보가 볼트 접합된 접합부를 가진 모듈러 건물의 접합부 구조성능 및 시공성을 평가하는 것이 연구의 목적이다. 모듈러 건축의 장점은 공사기간 단축, 경량성, 이동가능성 등으로 볼 수 있다. 반면에 유닛 또는 모듈의 운송비용이 공사비 절감 비용을 반감시킬 수 있고 많은 공장들이 외부 지역에 있으므로 이들을 도심지나 원하는 지역으로 이동하기 위해서는 비용이 추가된다. 그리고 유닛이나 모듈 설치에 크레인 등의 장비 사용으로 인해 시공비용이 증가될 수 있는 단점들이 존재한다. 본 연구에서는 해체조립이 용이한 볼트접합부 구조성능 및 모듈러 건축물의 시공사례를 통하여 공기, 비용 등 측면에서 기존 연구와 비교분석을 진행하고자 한다.

• Steel and Composite Structures
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• 제32권3호
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• pp.347-359
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• 2019

Modular construction has been increasingly used for mid-to-high rise buildings attributable to the high construction speed, improved quality and low environmental pollution. The individual and repetitive room-sized module unit is usually fully finished in the factory and installed on-site to constitute an integrated construction. However, there is a lack of design guidance on modular structures. This paper mainly focuses on the evaluation of the initial stiffness of corrugated steel plate shears walls (CSPSWs) in container-like modular construction. A finite element model was firstly developed and verified against the existing cyclic tests. The theoretical formulas predicting the initial stiffness of CSPSWs were then derived. The accuracy of the theoretical formulas was verified by the related numerical and test results. Furthermore, parametric analysis was conducted and the influence of the geometrical parameters on the initial stiffness of CSPSWs was discussed and evaluated in detail. The present study provides practical design formulas and recommendations for CSPSWs in modular construction, which are useful to broaden the application of modular construction in high-rise buildings and seismic area.

• Journal of applied mathematics & informatics
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• 제30권3_4호
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• pp.489-498
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• 2012

Most of the software reliability models are based on black box approach and these models consider the entire software system as a single unit. Present day software development process has changed a lot. In present scenario these models may not give better results. To overcome this problem an improved additive model has been proposed in this paper, to estimate the reliability of software with modular structure. Also the concept of imperfect debugging has been also considered. A maximum likelihood estimation technique has been used for estimating the model parameters. Comparison has been made with an existing model. ${\chi}^2$ goodness of fit has been used for model fitting. The proposed model has been validated using real data.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 추계 학술논문 발표대회
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• pp.245-246
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• 2012

Lately the Infill Modular Construction System which meets the domestic standards about the structure and fireproof performance and which is applied to the remodeling techniques is being emphasized. In order to introduce the Infill Modular Construction System to domestic market successfully, the development of insufficient element technologies and systematic analysis of process should be preceded. This research aims to establish of Standard Construction Process, as advanced research for the settlement of the Infill Modular Construction System. As advanced research for the activation of the Infill Modular Construction System, this research aims to develop Infill Unit Module's mobile device. This is expected to improve work efficiency. In addition organizing optimized Standard Construction Process by steady work analysis and improvement is being planned.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 추계 학술대회 학술발표 논문집
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• pp.122-125
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• 2003

By advent of NNC(Neural Network Chip), it is possible that process in parallel and discern the importance of signal with learning oneself by experience in external signal. So, the design of general purpose operation unit using VHDL(VHSIC Hardware Description Language) on the existing FPGA(Field Programmable Gate Array) can replaced EN(Expert Network) and learning algorithm. Also, neural network operation unit is possible various operation using learning of NN(Neural Network). This paper present general purpose operation unit using hierarchical structure of EN EN of presented structure learn from logical gate which constitute a operation unit, it relocated several layer The overall structure is hierarchical using a module, it has generality more than FPGA operation unit.