• Title/Summary/Keyword: Chan Bum Park

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A Study on Performance of a Variable-Speed Turboblower (가변속 터보블로워의 성능특성에 관한 연구)

  • Choi, Bum-Seog;Park, Moo-Ryong;Hwang, Soon-Chan;Park, Joon-Young
    • 유체기계공업학회:학술대회논문집
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    • 2003.12a
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    • pp.379-384
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    • 2003
  • A turbo blower directly driven by a variable-speed BLDC motor was designed and tested to investigate performance characteristics. Computational analysis and performance tests validated the design method for the present turbo blower. Experimental measurements showed that the blower has an enough stability margin. This paper gives an outline of design, computational flow analysis and performance test for aerodynamic performance of the blower

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Finiteness properties of some poincare duality groups

  • Lee, Jong-Bum;Park, Chan-Young
    • Journal of the Korean Mathematical Society
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    • v.32 no.1
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    • pp.33-40
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    • 1995
  • A space Y is called finitely dominated if there is a finite complex K such that Y is a retract of K in the homotopy category, i.e., we require maps $i : Y \longrightarrow K and r : K \longrightarrow Y with r \circ i \simeq idy$. The following questions are very classical in topology.

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