• Title/Summary/Keyword: R-113

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A Nonlinear Elliptic Equation of Emden Fowler Type with Convection Term

  • Mohamed El Hathout;Hikmat El Baghouri;Arij Bouzelmate
    • Kyungpook Mathematical Journal
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    • v.64 no.1
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    • pp.113-131
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    • 2024
  • In this paper we give conditions for the existence of, and describe the asymtotic behavior of, radial positive solutions of the nonlinear elliptic equation of Emden-Fowler type with convection term ∆p u + 𝛼|u|q-1u + 𝛽x.∇(|u|q-1u) = 0 for x ∈ ℝN, where p > 2, q > 1, N ≥ 1, 𝛼 > 0, 𝛽 > 0 and ∆p is the p-Laplacian operator. In particular, we determine ${\lim}_{r{\rightarrow}}{\infty}\,r^{\frac{p}{q+1-p}}\,u(r)$ when $\frac{{\alpha}}{{\beta}}$ > N > p and $q\,{\geq}\,{\frac{N(p-1)+p}{N-p}}$.

Effect of Power Dynamics in a Supply Chain on R&D and Market Performances (공급망 구성원 간 역학관계가 R&D 및 시장 성과에 미치는 영향)

  • Yoo, Seung Ho
    • Journal of the Korean Operations Research and Management Science Society
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    • v.41 no.1
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    • pp.113-126
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    • 2016
  • This study investigates the effect of power dynamics on R&D and market performances. Various types of relationships in a supply chain are considered. An R&D company offering new technology for product quality and a manufacturer responsible for both production and sales are utilized as subjects. The company with bargaining power differs with respect to the supply chain situation in practice, and no fixed single relationship and supply chain structure exist. However, only a few studies have considered the various relationships among players in a supply chain and their effects on performance. Therefore, we propose three models with different supply chain structures and power dynamics among players. This study contributes to the academia and supply chain practice by revealing the different characteristics of supply chain models.

N.R.A와 가축사료

  • 구리하라
    • KOREAN POULTRY JOURNAL
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    • v.6 no.6 s.56
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    • pp.113-115
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    • 1974
  • 다음은 미국농무성의 외곽단체인 N.R.A 극동사무소 축산사료담당 '구리하라'박사가 N.R.A의 업무활동을 월간양계 독자를 위해 간략히 소개하고 있다. N.R.A(National Renderes Association)라고 하면 시료용 동물성 유지(Feed Grade Animal Fats)위 율곡분(Meat and Bone Meal), 우모분(Feather Meal)등을 공급하고 있는 대단위 단체인 것이다. 구리하라박사가 소개하고 있는 최근의 업무활동과 N.R.A의 사업을 소개한다.

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Enhancement of Nucleate Pool Boiling of a Wire-Wrapped Tube (와이어붙이관의 핵비등 열전달촉진)

  • 김내현;김정식;남기일
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.5
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    • pp.1235-1244
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    • 1994
  • In this study, experimental results of the nucleate boling of wire-wrapped tubes are provided. Both water and R-113 were boiled. Solid stainless steel wires, stranded copper wires and stranded nylon wires were tested. Solid stainless wire is effective to enhance the boiling of water. The performance is approximately the same(or slightly better at certain conditions) as that of GEWA-T tubes. For the test range of wire diameter 0.6 $mm{\le}d{\le}2.6 mm$, the optimum gap width increases as the wire diameter increases. The maximum heat transfer coefficient was obtained for the 1.0 mm diameter wire, and it is 1.6 times larger than that of the GEWA-T at the heat flux of 20 $kW/m^{2}.$ Solid stainless wire is also effective to enhance the boling of R-113 at low heat fluxes. The performance of the wire-wrapped tube approaches that of GEWA-T. At high heat fluxes, however, the enhancement decreases. The reason may be attributed to the cavity shape and the high wettability of the refrigerants. Stranded copper or nylon wire is effective to enhance the boiling of R-113. The performance is approximately the same(or slightly better) as that of GEWA-T tubes. Maximum heat transfer was obtained for the stranded nylon wire, and it is approximately 1.4 times larger than that for the GEWA-T at the heat flux of 20 $kW/m^{2}.$ The reason may be atrributed to the favorable thermal environment in the restricted regions formed by twisted wires.

ALGORITHMS FOR AGGREGATE INTERLOCK CONSTITUTIVE BEHAVIOR AT R/C CRACKS (철근콘크리트 균열에서의 골재맞물림 거동에 대한 해석연구)

  • 최기봉;황철성
    • Magazine of the Korea Concrete Institute
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    • v.1 no.2
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    • pp.113-120
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    • 1989
  • 이 논문에서는 철근콘크리트 균열에서의 활동전단변형에대해 골재맞물림에 따라 수반되는 저항응력을 예측할 수 있는 해석방법들이 개발되어졌다. 이러한 방법들은 거의 정확하게 실험결과들을 예측하였으며 초기 균열폭, 콘크리트 압축강도, 최대 골재크기, 그리고 균열틈에 따라 수반되는 구속력에 의해 영향을 받는 골재맞물림 거동에 대한 해석연구를 위해 사용되어졌다.