• Journal of Computing Science and Engineering
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• 제6권4호
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• pp.280-286
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• 2012

The last decades have witnessed an increasingly indispensible role of high performance computing (HPC) in science, business and financial sectors, as well as military and national security areas. To introduce key aspects of HPC to a broader community, an HPC session was organized for the first time ever for the United States and Korea Conference (UKC) during 2012. This paper summarizes four invited talks that each covers scientific HPC applications, large-scale parallel file systems, administration/maintenance of supercomputers, and green technology towards building power efficient supercomputers of the next generation.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.58-62
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• 2006

In construction fields. numerous studies have attempted to find the solution of various emerging problems by the introduction of the high technologies of other areas in recent years. In Korea, based on the best IT infrastructure, much experimental studies which are trying to utilizing Photogrammetry, GSISC(Geo-Spatial Information System, Remote Sensing in construction project has been done. The purpose of this study is to analyze the trend of the technologies in the related-fields and examine the detailed image processing techniques. Moreover this paper provides the preparation to create technology road map for systematic research.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.719-724
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• 2006

Owing to its special features of light weight, high durability, corrosion-resistant, composite material used in civil infrastructure can not only solve fundamental problems of deterioration and corrosion, but also reduce both construction and maintenance cost significantly. Composite deck panels of 스냅핏 type connection previously designed and fabricated have been redesigned herein. The sensitivity of gaps between snap-fits and tip angles was investigated. Stacking sequence of plies was scrutinized in order to facilitate pultrusion process. Deck panels of redesigned configuration due to bending has been analyzed. A comparison between the preliminary and modified deck design has been made.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제2권3호
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• pp.135-149
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• 2008

Traditional attack detection schemes based on packets or flows have very high computational complexity. And, network based anomaly detection schemes can reduce the complexity, but they have a limitation to figure out the pattern of the distributed global scale network attack. In this paper, we propose an efficient and fast method for detecting distributed global-scale network attack symptoms in high-speed backbone networks. The proposed method is implemented at the aggregate traffic level. So, our proposed scheme has much lower computational complexity, and is implemented in very high-speed backbone networks. In addition, the proposed method can detect attack patterns, such as attacks in which the target is a certain host or the backbone infrastructure itself, via collaboration of edge routers on the backbone network. The effectiveness of the proposed method are demonstrated via simulation.

• Industrial Engineering and Management Systems
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• 제10권3호
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• pp.221-231
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• 2011

One of the critical issues in wireless sensor network is the design of a proper routing protocol. One possible approach is utilizing a virtual infrastructure, which is a subset of sensors to connect all the sensors in the network. Among the many virtual infrastructures, the connected dominating set is widely used. Since a small connected dominating set can help to decrease the protocol overhead and energy consumption, it is preferable to find a small sized connected dominating set. Although many algorithms have been suggested to construct a minimum connected dominating set, there have been few exact approaches. In this paper, we suggest an improved optimal algorithm for the minimum connected dominating set problem, and extensive computational results showed that our algorithm outperformed the previous exact algorithms. Also, we suggest a new heuristic algorithm to find the connected dominating set and computational results show that our algorithm is capable of finding good quality solutions quite fast.

• 한국CDE학회논문집
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• 제5권3호
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• pp.232-241
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• 2000

Even though we have greater chances to accomplish successful collaborative design by utilizing recent proliferation of networks, current practices do not fully take advantage of the information infrastructure. There are so much data over the networks, but not enough knowledge about the data is available to users. The main objectives of the product data interface system proposed in this paper are to capture more knowledge on managing product data and to provide users effective search capability. We define the metadata model for product data defined in STEP AP 203 and manage the metadata from product data in a repository system. Because we utilize the standard formats such as STEP for product data and RDF for metadata, the proposed approach can be applied to various fields of industries independently on commercial products.

• 전산구조공학
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• 제7권2호
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• pp.77-87
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• 1994

본 논문에서는, 고속철도용 슬래브 궤도의 동특성을 파악하여 소음.진동 대책을 마련하기 위한 기초자료를 제시하기 위해 차륜과 레일의 상호작용을 고려한 슬래브 궤도의 진동해석을 수행하였다. 해석시 열차의 스프링아래 질량은 Hertzian스프링을 통해 레일과 접촉하는 것으로 가정하였으며, 궤도는 2중 탄성지지보로 모델링 하였다. 연구결과 궤도지지계의 탄성, 질량 및 강성 등을 적절히 조절하므로서 궤도에 발생하는 진동 및 하부구조물로 전달되는 분포력을 감소시킬 수 있음을 알 수 있었다.

• 한국CDE학회논문집
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• 제6권4호
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• pp.236-243
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• 2001

A key factor far realizing the internet-based virtual manufacturing system(VMS) and virtual enter-prise(VE) is how to precisely and effectively represent the machine elements and mechanics. In this paper, we present methods to represent the numerically controlled machine tools in the internet environment. The method is composed of: 1) geometrical modeling of the machine tools, 2) kinematic modeling for the movements of the machine tools, and 3) representing the developed model in the internet infrastructure. Based on the models. a web-based virtual machine tools (WVMT) is developed, and it can be accessed at hrrp://wvmt.postech.ac.kr. The WVMT can be used for various purposes: 1) web-based virtual manufacturing system, 2) web-based CAM system, and 3) CNC educational tools for the vocational school through internet.

• 한국CDE학회논문집
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• 제10권6호
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• pp.402-411
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• 2005

Context-aware engineering services in ubiquitous environments are emerging as a viable alternative to traditional engineering services. Most of the previous approaches are computer-centered rather than human-centered. In this paper, we present a Ubiquitous and Context-Aware computing Framework for collaborative virtual Engineering $(U-CAF\acute{E})$ services. The proposed approach utilizes BPEL-based (Business Process Execution Language) process templates for engineering service orchestration and choreography and adopts semantic web-based context-awareness for providing human-centered engineering services. The paper discusses how to utilize engineering contexts and share this knowledge in support of collaborative virtual engineering services and service interfaces. The paper also discusses how Web services and JINI (Java Intelligent Network Infrastructure) services are utilized to support engineering service federations and seamless Interactions among persons, devices, and various kinds of engineering services.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2000년도 가을 학술발표회논문집
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• pp.67-74
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• 2000

Recently western countries are now beginning to use ACM (Advanced Composite Material) in the construction industry. Compared with conventional construction materials, ACM possesses many advantages such as light-weight, high-strength, corrosion resistant properties, etc. Among other fabrication process of ACM, pultrusion is one of the promising one for civil infrastructure application. In this paper, the structural characteristics of pultruded glass fiber reinforced composite structural member of angle and tube type were studied. Experiments for compression were performed for those members along with finite element buckling analysis with ABAQUS. The experimental and analytic results were compared each other and they were also compared with predicted values using coded formulae.