• Title/Summary/Keyword: set construction

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Power, mobility and wireless channel condition aware connected dominating set construction algorithm in the wireless ad-hoc networks (무선 에드 혹 네트워크에서 전력, 이동성 및 주변 무선 채널 상태를 고려한 연결형 Dominating Set 구성 방법)

  • Cho, Hyoung-Sang;Yoo, Sang-Jo
    • Proceedings of the Korea Information Processing Society Conference
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    • 2005.05a
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    • pp.1493-1496
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    • 2005
  • 연결형 dominating set기반의 라우팅 알고리즘에서 잦은 dominating set의 재구성은 루트 손실로 인한 전송 에러를 발생시키기 때문에, 노드의 잔여 전력량과 이동성을 고려하여 게이트웨이 노드를 선택하여야 한다. 또한 같은 지역에 노드가 집중되어 있다면 매체를 공유하는 무선 네트워크의 특성상 병목으로 인한 충돌 및 지연 등이 야기 될 가능성이 크다. 따라서 본 논문에서는 노드의 잔여 전력량 및 이동성, 이웃 노드수의 가중 가산 값에 비례하여 이웃 구성 통보 메시지 (neighbor set advertisement message)의 브로드캐스팅을 지연시키는 방법을 통해 연결형 dominating set의 재구성을 최소화 하여 신뢰성 있고 효율적인 데이터 전송을 보장하는 새로운 연결형 dominating set 구성 방법을 제안하고 다양한 상황에서의 실험을 통해 그 성능을 비교 평가하였다.

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Modelling the Estimation Process of Greenhouse Gas Emission in the Construction of Buildings

  • Yi, Kyoo-Jin
    • Journal of the Korea Institute of Building Construction
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    • v.12 no.3
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    • pp.266-274
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    • 2012
  • The annual expenditure on diesel oil and heavy oil in the construction sector is the second largest among all industrial sectors. To meet the government's greenhouse gas reduction targets, the construction sector has until 2020 to cut its emissions by 7.1%. Unlike other high-tech industrial sectors, the construction sector has a fairly limited scope for technological improvements, which hampers its capacity to achieve the reduction target. To reduce emissions, it is necessary to establish an energy and emissions strategy at the project planning stage, and energy use and the resulting emissions must be estimated. This research aims to establish an estimation methodology for greenhouse gas emissions at the planning stage of construction projects. To estimate the project-related emissions, this research indentified the relationship among the types of emissions in a cross-sectional matrix form, and then provided a set of calculation methods for total project related emissions.

A MODEL OF RISK MANAGEMENT PLAN AND SYSTEM FOR THE CONSTRUCTION PHASE

  • Seon-Gyoo Kim;Chan-Jeong Park ;Moon-Serk Yang;Jin-Bong Kim ;Hyung-John Shin
    • International conference on construction engineering and project management
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    • 2005.10a
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    • pp.341-346
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    • 2005
  • After the IMF shock, some major construction companies in Korea have been motivated to avoid and mitigate various risk factors which could be critical and catastrophic events to corporate revenue and organization internally or externally. It means that they are trying to introduce and set up a risk management plan and system suitable to their organization and culture. L construction co. ltd. is one of major construction companies that have been searching methodologies or technologies to manage various risk factors surrounding corporate marketing and project operation. This paper presents an unique approach to develop a model of risk management plan and system suitable to L construction itself focused on the construction phase.

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Conceptual design of electrical, water and gas utilities for MW class plasma wind tunnel in CBNU (전북대학교 MW급 플라즈마 풍동용 공통지원설비 개념설계)

  • Choi, Chea-Hong;Seo, Jun-Ho;Hong, Bong-Guen;Choi, Seong-Man
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.784-785
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    • 2010
  • The high enthalpy plasma research center in Chonbuk national university is under construction for MW class plasma wind tunnel. Four types of plasma equipment will be installed in the research center. The equipments are 1set of 0.4 MW class enhanced Huels type plasma equipment, 1 set of 2.4 MW class enhanced Huels type plasma quipment, 1 set of 60 kW RF plasma equipment and 1 set of 200 kW RF plasma equipment. And electrical, water and gas utilities to assistant plasma equipments are under construction.

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Site Plan of High-enthalpy Plasma Research Center in Chonbuk National University (전북대학교 고온플라즈마응용연구센터 Site Plan)

  • Kim, Min-Ho;Choi, Seong-Man;Seo, Jun-Ho;Choi, Chea-Hong;Hong, Bong-Guen
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.764-767
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    • 2010
  • The high enthalpy plasma research center in Chonbuk national university is under construction for MW class plasma wind tunnel. Four types of plasma equipment will be installed in the research center. The equipments are 1set of 0.4 MW class enhanced Huels type plasma equipment, 1 set of 2.4 MW class enhanced Huels type plasma equipment, 1 set of 60 kW RF plasma equipment and 1 set of 200 kW RF plasma equipment. And electrical, water and gas utilities to assistant plasma equipments are under construction. The research center consists of experiment building, research building, power supply building, air supply building, cooling tower foundation.

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An Experimental Study of Tension Properties on New Developed Up-Set Coupler (Up-Set Coupler 이음철근의 인장특성에 대한 실험적 연구)

  • Sim, Jong-Sung;Park, Cheol-Woo;Kang, Tae-Sung;Kim, Tae-Soo
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.12 no.5
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    • pp.109-115
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    • 2008
  • As structures are getting super-rise and large-sized, introducing the construction methods such as prefabrication of bar-meshes and complex method are being actively discussed to pursue the high quality of reinforced concrete, the simplification of field works, and the reduction of duration, as well as the study on how to connect reinforcing rods, which occurs while applying the same methods, is in progress Also, the pressure welded joint is a kind of method that heats the ends of reinforced bars locally and joint them, and after the pressure welding, the vulnerable part in the reinforced bar occur. Thus, in the construction field, the throughout quality control is necessary because of the delayed duration and the lowered construct ability. In this study, of the traditional lap splice method and the mechanical splice one, the screw coupler, we tried to look into through experiments the prefabrication method of bar-meshes, a typical joint method usually used for the joint parts for PSC structures applying the reinforced bar with its big diameter, and a newly-developed up-set coupler method. And we also examined the characteristic of tensile.

A Fuzzy Set Theoretic Approach for the Multigoal Plant Layout Planning

  • 홍관수
    • Journal of the Korean Operations Research and Management Science Society
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    • v.13 no.2
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    • pp.215-215
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    • 1988
  • This paper presents a fuzzy set theory based formulation and heuristic which will allow plant layout problems to be solved for more than two input goals with different weights. The heuristic combines a construction and improvement procedure to generate a good layout from the formulation. To test the effectiveness of the heuristic, a set of examples previously used by various authors is solved and the results are compared to those from other known heuristics. The comparison indicates that the proposed method performs well for each of seventeen classical test problems.

A fuzzy set theoretic approach for the multigoal plant layout planning

  • Hong, Kwan-Soo
    • Korean Management Science Review
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    • v.13 no.2
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    • pp.215-232
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    • 1996
  • This paper presents a fuzzy set theory based formulation and heuristic which will allow plant layout problems to be solved for more than two input goals with different weights. The heuristic combines a construction and improvement procedure to generate a good layout from the formulation. To test the effectiveness of the heuristic, a set of examples previously used by various authors is solved and the results are compared to those from other known heuristics. The comparison indicates that the proposed method performs well for each of seventeen classical test problems.

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A study on contaminant reduction performance of the adsorption protector for construction surface (흡착보양재의 오염물질방출 저감성능에 관한 연구)

  • Heo, Jung-Yong;Choi, Chang-Ho;Lee, Yun-Gyu
    • Proceedings of the SAREK Conference
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    • 2008.06a
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    • pp.714-719
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    • 2008
  • In a domestic construction field, after floor is constructed, protector for construction surface is set up to prevent the surface of the floor being scratched and polluted. However, the problem is that contaminants discharged with the removal of the protector for construction surface exert a bad influence for the indoor air quality. In the research, it tested to the contaminant reduction performance of the adsorption protector for construction surface using powder of charcoal by the alternative proposal of such protectors for construction surface

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TEN MANAGEMENT STRATEGIES TO AVOID CONSTRUCTION CONFLICTS

  • Nirmal Kumar Acharya;Young Dai Lee;Soo Yong Kim;Yong Duek Kim
    • International conference on construction engineering and project management
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    • 2005.10a
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    • pp.709-713
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    • 2005
  • The conflict problems encountered in the construction projects led to prolonged delays in implementation, interruptions and sometimes suspension. This paper has described ten fundamental management principles to avoid conflicts in construction field and increase the productivity. They are: i) hire good (not cheap) construction professionals ii) set reasonable time and cost goals iii) recognize contractors and designers are in business to make profit iv) draft a clear contract document v) pick a suitable project delivery system vi) implement a front-end approach vii) accept construction project as a dynamic process viii) need of education and training of professionals ix) accountability and teamwork in construction site, and x) avoid negligence.

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