• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2235-2237
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• 2005

This paper presents the transient impedance behaviors of grounding systems to lightning impulse current. The potential rise and effective impulse ground impedance of the test grounding electrodes were measured as a function of the rise time of impulse currents and lengths of down conductor. The transient ground impedances strongly depend on the configuration and size of grounding electrodes, the impulse current shapes and lengths of down conductor, and the inductance of reduce of grounding electrode inductance is an important factor to improve the transient ground impedance.

• International conference on construction engineering and project management
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• 2009.05a
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• pp.369-374
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• 2009

Project-based joint ventures are often used in the construction industry to assemble an organization that meets a client's project needs and matches or exceeds the capacities of competitors. The joint venture / partnerships provides the means for a firm to quickly add resource, political, technical, or other required strengths that will increase project acquisition. This paper sets out to study the types of joint ventures, different issues or problems while having joint ventures and the critical factors that contribute to successful joint ventures. A questionnaire was designed and administered to survey the issues and present practices of joint ventures in the South Florida construction industry. Along with the questionnaire, personnel interviews were also conducted to get first hand knowledge about the subject matter. The results are presented in the paper. These results specifically identify the overall practice of joint ventures in South Florida as well as indicate the most significant factors leading to failure or success of these ventures.

• International conference on construction engineering and project management
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• 2009.05a
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• pp.1370-1376
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• 2009

Reinforcing steel works should be carefully controlled by the construction manager considering the severe fluctuation of the price of reinforcing steel bars and for the safety of structure in building constructions. In particular, preparing rebar placing drawings needs more effort and time than before because of the emergence of higher and more complicated buildings. Moreover, the experience of field engineers or foremen (fabricators or detailers) in preparing placing drawings gives rise to the differences in fabricated bar type and quantity of bars used. To address these problems, this study proposed the support system in preparing placing drawings for reinforcing steel works efficiency. In the near future, if this system can be made available on the web, multiple end-users will be able to share the result; the efficiency of rebar supply chain management will also be improved.

• Journal of The Korean Digital Architecture Interior Association
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• v.13 no.3
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• pp.41-49
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• 2013

According to the ROK 2010 census, representatives living arrangement are changing from 4 people per household to 2 people. Increasing number of elderly household and single household, the variety of lifestyles there has been a type of family structure. In this study, 1) through a precedent study review and case analysis to deduct representative group of lifestyle of Korean household. 2) Proposing spatial configuration according to the preferred lifestyle. 3) Deducting residential U-services from which specified from "Ubiquitous City Construction Project Operation Guide (2009)" of the korean Ministry of Land, Transport and Maritime Affairs. 4) Deduct highly expected U-service by each of lifestyle. As a result, spatial configuration and U-Services are proposed by changes of lifestyle which is based on ROK 2010 census.

• 한국공간정보시스템학회:학술대회논문집
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• 2007.06a
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• pp.441-446
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• 2007

정보기술의 발달은 산업 전반에 매우 큰 영향을 주는 요소가 되고 있다. 이러한 정보 기술을 프로젝트에 효율적으로 사용함으로써 기존 프로젝트의 수행에 있어 불합리한 점을 제거하고 개선함은 물론 전체 프로세스에 대한 경제적인 효과를 기대할 수 있다. 특히 건설부문은 계획, 설계, 시공 및 유지관리에 이르기까지 다양한 공종이 유기적으로 연결되어 수행되는 바, 유비쿼터스 컴퓨팅 환경을 실제 건설공사의 현장에 접목하려는 시도는 의미가 크다고 볼 수 있다. 이른바 u-city 건설은 IT기반의 첨단공공서비스가 사회전반에 제공되는 도시를 말한다. 최근에 기존 도시를 첨단화하거나 완전히 새로운 신도시를 건설하는 지방자치단체 또는 국가주도형 사업은 대부분 첨단 유비쿼터스 기술을 적용, 도시 서비스의 차별화를 구축하고 있다. 이에 본 논문은 도시의 근간을 이루는 토목사업중 도로를 설계함에 있어 관련되는 유비쿼터스 요소기술을 도출하고, 이를 설계에 반영하므로 u-건설의 실질적인 접근방향을 모색하고, 동시에 지속적인 u-건설이 가능할 수 있는 기반을 삼고자 한다.

• Transactions of Materials Processing
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• v.12 no.6
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• pp.572-581
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• 2003

In this paper, an automatic surface construction method based on B-spline surface and scalar field theory is proposed to generate the extrusion die surface of non-symmetric H-and U-shaped sections. The isothermal lines and stream lines designed in the scalar field are introduced to find the control points which are used in constructing B-spline surfaces. Intersected points between the isothermal lines and stream lines are used to construct B-spline surfaces. The inlet and outlet profiles are precisely described with B-spline curves by using the centripetal method for uniform parameterization. The extrusion die surface is generated by using the cubic curve interpolation in the u-and v-directions. A quantitative measure for the control of surface is suggested by introducing the tangential vectors at the inlet and outlet sections. To verify the validity of the proposed method, automatic surface generation is carried out for extrusion die of non-symmetric H-and U-shaped sections.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.8 no.3
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• pp.112-121
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• 2009

National government established a new law to solve the problems and to support u-City projects. Nevertheless there are still some issues which are a lack of the contents on national plan, connecting restriction among the communication networks between public institutions, a shortage of funds. This study investigated and analyzes these issues, and proposed some ideas to solve them.

• 한국방재학회:학술대회논문집
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• 2008.02a
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• pp.131-134
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• 2008

Increasing the need of national safety management system in order to an epoch-making improvement to scientific disaster management which appears new types of disasters through the exchange of traditional disaster environment and responds actively to the rapid exchange of social environment based on u-IT. Requiring the development of systematical information sharing networking system and sharing realtime data amongst government, local authorities and related organisations under both safety management in normal times and circumstance management in disaster times, and need for the establishment of national safety strategy, which has been strengthened function such as prevention and preparation. This research provides a basic scheme and strategic tasks in order to constitute preventing scientific national disaster prevention structure at anytime and anywhere from disaster which is based on ubiquitous technology and realise the intelligent national disaster prevention system of u-safe Korea.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.6
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• pp.1447-1452
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• 2010

Ubiquitous society to build basic infrastructure in the power supply and power equipment safety is important. u-City in order to prevent the disaster of u-IT Power Equipment Performance Module and the security for the safety of the u-City is necessary. In this paper, the power unit of u-IT module, temperature sensor, humidity sensor, equipped with sensors arranged throughout the fire, and home distribution boards, Home Network Wall-Pad, Blocker, MPNP black boxes, arc detection, arc safety equipment, outlet of the modular performance evaluation methods and security methods will be studied. u-IT power devices and sensors to analyze the information conveyed by proactive risk and ensure safety, access control, authentication, security safeguards, such as u-IT integrated management system for electrical safety and strengthen the security, safety and security with a u-City will contribute to the construction and operation.

• Journal of Korean Society for Geospatial Information Science
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• v.20 no.4
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• pp.55-65
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• 2012

The purpose of this study is to construct the System Dynamics Model that can analyze urban spatial and temporal change and suggest the policy directions applicable to U-City Planning in Busan based on the SD model. It reviews previous literatures to elicit U-City issues and performs the case study to simulate urban spatial and temporal changes in Busan. The elicited results are connected into the policy directions of U-City planning. It emphasizes the necessity of business model suggestion based on U-City technology and industry not a tool, the U-City model construction that linkages and integrates the existing cities and new cities, and the excavation of U-City service model reflecting social and demographic changes.