• 베이커리
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• no.10 s.411
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• pp.172-172
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• 2002

• Magazine of the Korea Concrete Institute
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• v.7 no.4
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• pp.119-128
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• 1995

This paper summarizes experimental results for studying feasibility and structural behavior of' a half slab which is getting popularity in recent building construction in favour of the savings in manpower, coats, and construction period. 17 specimens were tested to investigate and analyze the flexural strength of precast concrete slab, half slab, and half slab-wall joint. The primary variables of the testing program were: thickness of precast concrete slab, truss mesh shape, and type of loadings. Test results show that the flexural strength of precast concrete slab in reverse loading is lower than the design strength, but the flexural strength of precast concrete slab, half slab and half slab-wall joint in direct loading is higher than the design srength. No horizontal cracks were found in the connection between insitu concrete and precast concrete slab. The flexural strength of half slab and half slab-wall joint was the same as that of reinforced concrete members. This study concludes that there will not be any structural problem in using a half slab reinforced by truss mesh if props spacing of 2.0m-2.5m, cleanness, and rough finishing between precast concrete and insitu concrete slab are kept.

• Proceedings of the KAIS Fall Conference
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• 2010.11a
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• pp.466-469
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• 2010

본 논문은 습기가 많은 지하실의 벽을 페인트가 아닌 플라스틱 판넬을 조립 시공하여 미려한 표면과 내구성을 유지하도록 하는 벽체의 개발을 제시하였다. PC 및 PP 소재를 사용하여 시제품을 만들어 시법시공하여 본 결과 지하실 내벽에 적합한 것을 알았다.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2258-2260
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• 2001

최근 급속한 하드웨어 및 소프트웨어 기술의 발달로 인하여 PC기반의 분산제어 시스템들이 산업계에 모습을 보이고 있다. 발전소 시뮬레이터는 발전소의 모든 운영을 통제하는 중앙제어실과 똑같은 형태 및 동작특성을 갖춘 설비로 운전원들이 정상적 상황은 물론 가상적인 사고상황에서도 긴급 대응할 수 있도록 훈련에 이용되는 모의훈련 시스템이다. 본 논문에서는 제어 자동화 통신망으로 떠오르고 있는 필드버스와 함께 시뮬레이터 판넬에 설치된 수만개에 달하는 각종 입출력 신호들을 분산된 PC 시스템에서 수집하고 이 신호들을 실시간 통신기술을 이용하여 원격의 현장(시뮬레이션 컴퓨터)까지 송수신해 주는 입출력 제어 시스템의 설계에 관한 내용을 소개한다. 특히 분산된 PC 시스템 구조와 각 시스템에 탑재될 소프트웨어 모듈들 그리고 TCP/IP를 대신하여 사용하고 있는 필드버스 프로토콜 드라이버의 설계에 관한 내용을 중심으로 소개하고자 한다.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05a
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• pp.66-69
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• 2006

Three reinforced concrete rigid frames and infilled rigid frames with new retrofitting system were tested under both vertical and cyclic loadings, Experimental programs were carried out to evaluate and improve the seismic performance of such test specimens, such as the hysteretic behavior, the maximum horizontal strength, crack propagation, and ductility etc. under load reversals. All the specimens were modeled in one-third scale size. For specimens(RFHPC, RFAR) designed by the improving of seismic performance of the rigid frame using the high ductile fiber composite PC panel and ALC panel system, load-carrying capacities were increased $1.45{\sim}2.28$ times, and hysteretic behavior was very stable during the final tests in comparison with the standard specimen(SRF).

• Computational Structural Engineering
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• v.9 no.2
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• pp.93-101
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• 1996

An artificial neural network is a computational model that mimics the biological system of the brain and it consists of a number of interconnected processing units where it can reasonably infer by them. Because the neural network is particularly useful for evaluating systems with a multitude of nonlinear variables, it can be used in experimental results predictions, in structural planning and in optimum design of structures. This paper describes the basic theory related to the neural networks and discusses the applicability of neural networks to predict the ultimate shear capacity of the precast concrete vertical joints by comparing the neural networks with a conventional method such as regression.

• Korean Institute of Interior Design Journal
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• no.14
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• pp.27-32
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• 1998

Present structure design has a problem arising from the fact that present apartment housing design doesn't satisfy user's diverse demand. An aim of this study on searching out the alternative to solve this problem. The results of study are as follows : 1) Methods of flexible structure are analyzed to reflect user's needs and practical example of those proposed. 2) To raise the flexibility of design reinforced concrete pannel wall system are selected. The basic types of T and II for the figures of pannel are adopted. As a result it brought so much open space not having influenced on the load of construction that it enhances the flexibility of the space allocation. Also that made it easy to meet the user's demand for 8 kinds of plan types are easily designed according to the arrangement of the space and its scale. These results will become basic data of future unit plan design in apartment housing.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.248-248
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• 2000

본 연구는 조선 소조립, 판넬조립 등의 공정에서 발생되는 필렛 용접 부위의 용접 자동화를 위한 로봇 시스템 개발에 관한 연구이다. 조선등의 중공업 분야에서는 작업이 중량이고 대형임에 따라 로봇이 부재의 특정위치로 이동하여 작업해야 한다. 또한 작업대상의 형상이나 치수가 매번 변경됨에 따라 이에 능동적으로 대처할 수 있어야 한다. 본 연구에서는 두 대의 로봇(2대x6축=12축)이 다축 문형 캔트리(4축)에 장착된 조선용 필렛용접 로봇 시스템(16축)을 개발하였다. 필렛용접부재를 중심으로 두 대의 로봇이 양쪽을 동시에 용접하는 방식으로 고속회전토치를 적용하여 위빙동작없이 원하는 용접각장(Leg Length)을 생성할 수 있다. 캔트리 시스템은 PC 기반의 별도 제어기로 구성하여 두 대의 로봇 제어기와 신호 입출력에 의해 동시동작이 가능하도록 하였으며, 작업장에 놓인 부재의 위치오차를 보장하기 위하여 시각센서를 적용하였다. 용접시작점의 위치보정을 위한 시작점 검출을 위해접촉센서(Touch Sensor)를 적용하였으며, 용접선 추적을 위해서 아크센서(Arc Sensor)를 적용하였다. 본 시스템 2000년 1월 제작 설치가 완료되어 현재 성능 테스트가 완료된 상태로 향후 생산현장에 적용될 계획이다.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.105-106
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• 2015

본 논문은 1MVA까지 대응구성이 가능한 병렬확장구조를 가진 EES용 PCS의 개발에 관해 기술하고 있다. 시장의 다양한 용량요구에 대응하기 위해 Stack과 필터로 구성된 인버터 Stack 판넬을 설계/구현하였으며 이를 이용하여 1MW까지 병렬구성하여 대응이 가능하다. 높은 시스템 전력밀도와 MTBF, 효율을 구현하였으며 이에 대한 설계 및 시스템 제어, 시뮬레이션 결과에 관해 언급한다.

• Journal of the Korean Society of Hazard Mitigation
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• v.2 no.4 s.7
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• pp.131-141
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• 2002

Precast concrete (PC) panels are often used as retaining walls to support soil pressure. In such a case, the panels should be connected at the location where PC panels meet with a buttress. However, it is not easy to provide enough development length for the reinforcing steels due to the limited width of the buttress. If it happens, the width of buttress should be increased as large enough although it is not desirable. The critical section required for providing the development length is always located where the flexural moment is maximum. Thus it is the place the buttress width ends. Also it is the place that the reinforcing steels stressed to maximum. However, it is possible to make differentiate between the maximum moment location and the most stressed location of reinforcing steels. It means that the most stressed location of reinforcing steels, the critical section, can be moved to the other place where the moment is not maximum. New critical location will have less moment than that of buttress width ends. In consequence, the development length would be longer than that of the typical way of construction. Debonding or cutting technique make it possible to reduce the moment strength of a section. Therefore reinforcing steels are debonded or cut to have a desired flexural strength at a desired place. In this study, five test specimens in full scale were erected to examine the effects of critical section movement in PC panel joints. Test parameters were the length variations of debonded and cut reinforcing steels. The test results showed that the debonding or cutting technique could be used to lengthen the development length in the joint of PC panels.