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Spray Characteristics of a Pilot Nozzle in a Counter-Swirl Type Gas Turbine Combustor (가스터빈 연소기용 대향류 선회기의 분무 특성)

  • Ko, Y.S.;Kim, M.H.;Kim, D.J.;Min, D.K.;Chung, S.H.
    • Journal of ILASS-Korea
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    • v.1 no.2
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    • pp.42-49
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    • 1996
  • The structure of sprays from a simplex type pilot nozzle atomizer is studied experimentally by measuring velocities, Sauter mean diameter, and number density. Interaction of the spray with gas-phase flow field generated from a 1 MW range industrial gas turbine combustor adopt ing a counter-swirler is investigated. Various spray behaviors are reported. Especially interest ing characteristics are the tangential motion of the spray and of the spray with swirl interaction. It shows a Rankine combined vortex type of velocity characteristics, having linear velocity profile inside the inner core whole small particles exist and rapidly decreasing velocity profiles outside. Interacting spray has relatively uniform number density profiles compared to the nozzle spray itself.

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Studies on the Chemical Plating of Nickel and Chromium on Steel (화학도금법에 의한 강의 니켈 및 크롬도금)

  • Kim, Man;Kim, Dai-Ryong;Yoon, Byung-Ha
    • Journal of the Korean institute of surface engineering
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    • v.15 no.3
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    • pp.127-137
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    • 1982
  • In chemical plating of nickel and chromium on steel, studies on various factors affect-ing the plating operations were carried out. The optimum bath compositions and operat-ing conditions were obtained. The structure and properties of the as deposits or deposits after heat treatment were investigated. (1) The most optimum conditions for the chemical nickel and chromium plating were; 〔Ni2+〕/〔H2PO2-〕; 0.5∼0.8, 〔Cr3+〕/〔H2PO2-〕; 0.6∼0.9 PH;5.0∼5.5, temperature; 90∼95$^{\circ}C$ (2) In the case of nickel deposition, the hardness of deposits increased with increasing phosphorous contents. Heat-treating at the temperature range 200$^{\circ}C$ to 600$^{\circ}C$, the maximum hardness of deposits was obtained at 400$^{\circ}C$ and decreased at temperature above 400$^{\circ}C$ due to growth of Ni3P. (3) Corrosion resistance of chemical nickel deposits was improved with increasing of p-hosphorous contents and heat treating temperature.

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TENDER WITH ACCORDANCE TO FIDIC $(F\acute{e}d\acute{e}ration Internationale des Ing\acute{e}nieurs-Conseils)$

  • Barbuzynski Stanislaw;Kim Soo-Yong;Lee Young-Dai
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • autumn
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    • pp.335-340
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    • 2002
  • FIDIC $(F\acute{e}d\acute{e}ration Internationale des Ing\acute{e}nieurs-Conseils)$ is the worldwide federation of consulting engineering member associations dedicated to developing relationships between the consulting engineering profession and governments, funding agencies, banks, industry, commerce, contractors, suppliers and other construction industry professions. Today FIDIC membership numbers nearly 70 member associations from all parts of the globe. The members of each national association comply with FIDIC's code of ethics which calls for impartial advice, competence and fair competition. FIDIC acts as a forum for the exchange of views and information and actively encourages the discussion of matters of mutual concern among member associations. FIDIC prepared regulations concerning tenders, it is a method of choice of investment contractor, which serves to optimum of utilization of investment funds. FIDIC procedure is the most often used in international tenders.

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Development of Cooling System for Thermal Management and Water Balance in Fuel Cell Vehicle (연료전지 차량의 열 및 물 균형 유지를 위한 냉각 시스템 개발)

  • Kim, Seong-Kyun;Lee, Seung-Yong;Kim, Chi-Myung;Park, Yong-Sun
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.11a
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    • pp.113-117
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    • 2006
  • This paper Is for development of cooling module in order to maintain heat and water balance in fuel cell vehicle. Thermal management system for fuel cell is disadvantage because the temperature of coolant is lower than that of ICE and heat duty of radiator is higher. By CFD simulation, cool ing module was developed for water balance of system. Hot chamber test and hot area/high altitude test on cool ing module was completed.

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Installation and Monitoring of Bankfiltration (including alluvial and riverbed deposits) Source Heat Pump Cooling System (강변여과수(충적층 및 하상)를 이용한 냉방시스템 설치 및 모니터링)

  • Jung, Woo-Sung;Hwang, Ki-Sup;Ahn, Young-Sub
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.11a
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    • pp.5-8
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    • 2006
  • The Alternative energy has lately attracted considerable attention due to the high oil price and environment problem. In this study, pilot test facility for using the geothermal energy source from riverbank filtration was constructed and monitoring devices are installed to estimate the efficiency of this system. Initial installation cost can be saved efficiently by connect ing a heat pump system into the exist ing pumping well in Changwon riverbank filtration site. One set of monitoring results during summer was presented and analyzed.

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A Study on the Internet Market ing Strategy uh ich applies the web site for Family Restaurant (패밀리레스토랑의 웹사이트를 활용한 인터넷마케팅 전략에 관한 연구)

  • 진양호;전진화
    • Culinary science and hospitality research
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    • v.8 no.1
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    • pp.1-21
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    • 2002
  • A study is on the market ing strategy which applied the web site for family restaurant. The internet marketing that the firm uses to attract consumer needs and it can be said to be the strategic effort to cope with dynamic environmental change in the market with strategic flexibility which has competitive advantage and increase its profitablelity. This study establish an internet marketing strategy plan and it presented. First, it constructs a data base using CRM and it manages with to create the benefit model. Second, it constructs the trusted relationship of the customer using Permission marketing. Third, the virus marketing is effect ive to create customers in short duration. Forth, e-mai1 marketing for target customer is also effective Fifth, experienced marketing provides the good experience and an immersion. Sixth, tie-in marketing which co-operate with the other company is magnifies a category of customer therefore this study about internet marketing action will be hopefully continued.

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Preparation of Nylon 6/ Clay Nanocomposites by Reactive Extrusion

  • Soonho Lim;Park, Jung-Hoon;Kim, Woo-Nyeon;Lee, Sang-Soo;Kim, Junkyung
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2003.10a
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    • pp.16-20
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    • 2003
  • As the preliminary works for the preparation of exfoliated nanocomposites by reactive extrusion (REX) the modified anionic polymerization proceeded in a flask using an $\varepsilon$-caprolactam, catalyst, initiator, and clay. Polymerization methods were classified with a variation of the clay adding time. Intercalations mechanism of clay layers was investigated by measuring the WAXD peaks of clay with polymerization. In the preparation of nanocomposites, the molecular weight of nylon 6 was affected by the clay content. From the mechanical property measurement, improved properties were obtained in comparison to the neat nylon 6, and these properties were also affected by the molecular weight.

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