... Mori¹

Department of Fluid Mechancis, Central Research Insititute of Electric Power Industry (CRIEPI), 1646 Abiko, Abiko city, Chiba 270-1194, Japan. email:mori@criepi.denken.or.jp

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... Chang²

Department of Civil Engineering, Texas A&M University, College Station, Texas 77843-3136, USA. email:kchang@tamu.edu

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