• 한국해양공학회지
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• 제15권4호
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• pp.80-85
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• 2001

The early construction of the internet based ship basic planning supporting system based on the concurrent engineering and the internet technology is essential as a means for the improvement of technology and design productivity our ship building industry is facing currently. Further more, technological base construction for the construction for the construction of the cooperation system on the level of ship building industry is necessary for the technological base security to maintain and develop ship building industry continuosly in the 21st century of the information industry environment and for the technological improvement of the middle and small shipyard falling behind relatively and finally for the breaking through our ship building industry environment in which inter-enterprise competition is deeping. In this study, we designed the frame-system of the ship design supporting system and presented the development scenario based on core element technology.

• Journal of Communications and Networks
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• 제7권4호
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• pp.408-416
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• 2005

Quality of service (QoS) provision is an important and indispensable function for multi-service wireless networks. In this paper, we present a new scheduling/admission control frame­work, including an efficient rate-guaranteed opportunistic scheduling (ROS) scheme and a coordinated admission control (ROS­CAC) policy to support statistic QoS guarantee in multi-service wireless networks. Based on our proposed mathematical model, we derive the probability distribution function (PDF) of queue length under ROS and deduce the packet loss rate (PLR) for individual flows. The new admission control policy makes admission decision for a new incoming flow to ensure that the PLR requirements of all flows (including the new flow) are satisfied. The numerical results based on ns-2 simulations demonstrate the effectiveness of the new joint packet scheduling/admission control framework.

• Journal of Communications and Networks
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• 제11권4호
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• pp.350-358
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• 2009

In a wireless sensor network (WSN) setting, this paper presents a distributed decision-making framework and illustrates its application in an online structural health monitoring (SHM) system. The objective is to recover a damage severity vector, which identifies, localizes, and quantifies damages in a structure, via distributive and collaborative decision-making among wireless sensors. Observing the fact that damages are generally scarce in a structure, this paper develops a nonlinear 0-norm minimization formulation to recover the sparse damage severity vector, then relaxes it to a linear and distributively tractable one. An optimal algorithm based on the alternating direction method of multipliers (ADMM) and a heuristic distributed linear programming (DLP) algorithm are proposed to estimate the damage severity vector distributively. By limiting sensors to exchange information among neighboring sensors, the distributed decision-making algorithms reduce communication costs, thus alleviate the channel interference and prolong the network lifetime. Simulation results in monitoring a steel frame structure prove the effectiveness of the proposed algorithms.

• Structural Engineering and Mechanics
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• 제54권6호
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• pp.1175-1200
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• 2015

This paper investigates the fundamental period of vibration of RC buildings by means of finite element macro-modelling and modal eigenvalue analysis. As a base study, a number of 14-storey RC buildings have been considered "according to code designed" and "according to code non-designed". Several parameters have been studied including the number of spans; the span length in the direction of motion; the stiffness of the infills; the percentage openings of the infills and; the location of the soft storeys. The computed values of the fundamental period are compared against those obtained from seismic code and equations proposed by various researchers in the literature. From the analysis of the results it has been found that the span length, the stiffness of the infill wall panels and the location of the soft storeys are crucial parameters influencing the fundamental period of RC buildings.

• 지식정보인프라
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• 통권4호
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• pp.94-99
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• 2001

WAN 분야는 더욱 다양한 형태로 진화되고 있다. 과거 주로 전용선 또는 저속의 X.25망에 의존하던 광역망이 ISDN, Frame-Relay와 같은 디지털 교환망과 ADxL과 같은 고속 가입자망으로 이전되었고, 머지않아 인터넷 기반의 가상시설망으로 확대될 것으로 전망된다.

• 한국콘텐츠학회논문지
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• 제14권1호
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• pp.48-55
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• 2014

서구의 근대화를 통해서 기술적 변화와 예술 사이의 새로운 관계가 형성되기 시작하였다. 그전까지 특정 개인과 소수의 사람들에 의해서 향유되던 과거의 예술이 기술에 의해 대량으로 생산됨으로써 대중적인 수용이 가능해졌다. 한 프레임씩 정지된 프레임들을 카메라로 촬영해서 재현한다는 점에서 애니메이션은 영화적 특성을 보이는데 본 연구에서는 이런 애니메이션의 영화적 운동성에 대해서 논의하면서 애니메이션에서 재현되는 운동성이 아무리 충실하게 만들어진 것일지라도 현실 세계의 운동성은 물론이고 라이브액션 영화에서 재현되는 운동성과도 동일할 수 없다는 점을 알 수 있다. 결국 애니메이션은 영화적 요소들과 애니메이션만의 디테일한 연속성으로 운동성을 창조한다. 이런 운동성으로 애니메이션만의 리얼리티가 살아나고 애니메이션이라는 예술형식의 위력을 점점 발휘시킬 수 있다.

• 한국실내디자인학회논문집
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• 제14권5호
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• pp.10-17
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• 2005

This Study is concerned with the acceptance of Western timber structure and the interior space of church buildings in the early modern period in Korea. Timber roofs have represented a wide variety of constructional forms and have been fundamental to any technological appraisal of the evolution of both of Western and Eastern architecture. Especially the roof structure of the church buildings reflects the technological level, aesthetic sense, and spacial concepts of the age. Between Western timber structure and Korean timber structure, there are many differences in not only structural form but also form of roof, members, load, frame system and etc. And there were various types of framing technique such as timber truss, timber arch, timber vault in the western style church architecture in the early modern period in Korea. I have summarized the character of the acceptance process of Western timber structure and the influences on the interior space of church buildings.

• Structural Engineering and Mechanics
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• 제39권4호
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• pp.499-520
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• 2011

The effectiveness of a technique for the repair of reinforced concrete members in combination with a technique for the repair of masonry walls of infilled frames, damaged due to cyclic loading, is experimentally investigated. Three single - story, one - bay, 1/3 - scale frame specimens are tested under cyclic horizontal loading, up to a drift level of 4%. One bare frame and two infilled frames with weak and strong infills, respectively, have been tasted. Specimens have spirals as shear reinforcement. The applied repair technique is mainly based on the use of thin epoxy resin infused under pressure into the crack system of the damaged RC joint bodies, the use of a polymer modified cement mortar with or without a fiberglass reinforcing mesh for the damaged infill masonry walls and the use of CFRP plates to the surfaces of the damaged structural RC members, as external reinforcement. Specimens after repair, were retested in the same way. Conclusions concerning the effectiveness of the applied repair technique, based on maximum cycles load, loading stiffness, and hysteretic energy absorption capabilities of the tested specimens, are drawn and commented upon.

• Structural Engineering and Mechanics
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• 제31권4호
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• pp.423-437
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• 2009

In order to perform a step-by-step force-displacement response analysis or dynamic time-history analysis of large buildings with masonry infilled R/C frames, a continuous force-deformation model based on an equivalent strut approach is proposed for masonry infill panels containing openings. The model, which is applicable for degrading elements, can be implemented to replicate a wide range of monotonic force-displacement behaviour, resulting from different design and geometry, by varying the control parameters of the model. The control parameters of the proposed continuous model are determined using experimental data. The experimental program includes fifteen 1/3-scale, single-story, single-bay reinforced concrete frame specimens subjected to lateral cyclic loading. The parameters investigated include the shape, the size, the location of the opening and the infill compressive strength. The actual properties of the infill and henceforth the characteristics needed for the diagonal strut model are based on the assessment of its lateral resistance by the subtraction of the response of the bare frame from the response of the infilled frame.

• 기술혁신학회지
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• 제20권4호
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• pp.1015-1035
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• 2017

이 연구는 한국에서 '기술혁신' 개념이 어떻게 변화되어 왔는지를 분석한다. 이를 위해 한국과학기술단체총연합회의 기관지인 "과학과 기술" 기사에서 등장한 '기술혁신' 키워드를 중심으로 네트워크 분석을 실시하였다. "과학과 기술"은 1968년 이후 꾸준히 발간되었기 때문에 한국 과학기술사회 전반의 동향을 파악하기 위한 사료로서 가치가 높다. 이 연구에서는 1968년 이후 "과학과 기술"에 실린 기사들 중 제목에 '기술혁신' 키워드가 포함된 모든 기사의 전문을 분석 대상으로 삼았다. 시간적으로는 1968년부터 2017년까지의 기간을 세 구간으로 나누어 '기술혁신'과 동시출현하는 키워드들의 변화를 분석하였다. 이를 통해 도출된 결과는 다음과 같다. 첫째, 기술혁신 개념은 꾸준히 국가 주도의 산업발전을 위한 요소로 이해되고 있었다. 둘째, 그럼에도 불구하고 공업, 생산에 국한되어 있던 기술혁신개념은 1980년대를 거치며 다양한 연구개발 분야 및 이해관계자들을 이어주는 키워드로 변화하였다. 이 연구의 결과는 향후 한국적 맥락을 기반으로 한 기술혁신정책의 방향성을 모색하는데 활용될 수 있을 것으로 기대된다.