Resat Ulusay, Hacettepe University, Ankara, Turkey OEmer Aydan University of the Ryukyus, Okinawa, Japan Hasan Gercek Bulent Ecevit University, Zonguldak, Turkey Mehmet Ali Hindistan Hacettepe University, Ankara, Turkey Ergun Tuncay Hacettepe University, Ankara, Turkey