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Öğe An Application of Multicriteria Group Decision Making by Soft Covering Based Rough Sets(UNIV NIS, FAC SCI MATH, 2015) Yuksel, Saziye; Tozlu, Naime; Dizman, Tugba HanIn this work we define soft covering based rough set and present its related properties. Also we present an example in medicine which aims to find the patients with high prostate cancer risk. Our datas are 56 patients from Selcuk University Meram MedicineÖğe Application of soft sets to diagnose the prostate cancer risk(SPRINGEROPEN, 2013) Yuksel, Saziye; Dizman, Tugbahan; Yildizdan, Gulnur; Sert, UnalIn recent years the artificial intelligence has been developed rapidly since it can be applied easily to several areas like medical diagnosis, engineering and economics, among others. In this study we have devised a soft expert system (SES) as a prediction system for prostate cancer by using the prostate specific antigen (PSA), prostate volume (PV) and age factors of patients based on fuzzy sets and soft sets and have calculated the patients' prostate cancer risk. Our data set has been provided by the Department of Urology, Meram Medical Faculty in Necmettin Erbakan University, Konya, Turkey.Öğe Soft Covering Based Rough Sets and Their Application(HINDAWI PUBLISHING CORPORATION, 2014) Yuksel, Saziye; Ergul, Zehra Guzel; Tozlu, NaimeSoft rough sets which are a hybrid model combining rough sets with soft sets are defined by using soft rough approximation operators. Soft rough sets can be seen as a generalized rough set model based on soft sets. The present paper aims to combine the covering soft set with rough set, which gives rise to the new kind of soft rough sets. Based on the covering soft sets, we establish soft covering approximation space and soft covering rough approximation operators and present their basic properties. We show that a new type of the soft covering upper approximation operator is smaller than soft upper approximation operator. Also we present an example in medicine which aims to find the patients with high prostate cancer risk. Our data are 78 patients from Selcuk University Meram Medicine Faculty.Öğe UPPER AND LOWER NA-CONTINUOUS MULTIFUNCTIONS(HACETTEPE UNIV, FAC SCI, 2011) Yuksel, Saziye; Simsekler, Tugba Han; Kut, B.The aim of this paper is to introduce a new class of continuous multifunctions, namely upper and lower na-continuous multifunctions, and to obtain some characterizations concerning upper and lower na-continuous multifunctions. The authors investigate the graph of upper and lower na-continuous multifunctions, and the preservation of properties under upper na-continuous multifunctions. Also, the relationship between upper and lower na-continuous multifunctions and some known types of continuous multifunctions are discussed.Öğe Upper and lower pre-strong na continuous multifunctions(ELSEVIER SCIENCE INC, 2011) Yuksel, Saziye; Simsekler, Tugba Han; Bilik, BerrakThe aim of this paper is to introduce a new class of multifunctions namely pre-strong na continuous multifunctions and to obtain some characterizations and properties of it. (C) 2011 Elsevier Inc. All rights reserved.