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Öğe a?†-Extremally disconnected ideal topological spaces(Springer, 2009) Ekici, E.; Noiri, T.The notion of aÖğe Almost nearly continuous multifunctions(2004) Ekici, E.Erdal Ekici has introduced and studied nearly continuous multifunction [Acta Math. Univ. Comenianae, Vol. LXXII, 2 (2003), pp. 1-7]. The purpose of the present paper is to introduce and study upper and lower almost nearly continuous multifunctions as a weaker form of upper and lower nearly continuous multifunction. Basic characterizations, several properties of upper and lower almost nearly continuous multifunctions are investigated.Öğe Generalized hyperconnectedness(Springer, 2011) Ekici, E.The main purpose of this paper is to introduce and study generalized hyperconnected spaces. Various characterizations of generalized hyperconnected spaces and preservation theorems are discussed.Öğe Generalized submaximal spaces(Springer, 2012) Ekici, E.The notion of generalized submaximal spaces is introduced and studied. Properties and characterizations of generalized submaximal spaces are discussed.Öğe New generalized topologies on generalized topological spaces due to Csaszar(Springer, 2011) Ekici, E.; Roy, B.We introduce new types of sets called -sets and study some of their fundamental properties. We then investigate the topologies obtained from these sets.Öğe On (?,p)-continuous functions and (?,p)-closed graphs(Soc Paranaense Matematica, 2009) Caldas, M.; Ekici, E.; Jafari, S.; Moshokoa, S. P.It is the object of this paper to introduce the notions of (delta, p) - continuity and (delta, p)-closed graphs by utilizing the notion of (delta, p)-open sets and investigate the fundamental properties of (delta, p)-continuous functions and also present some properties of functions with (delta, p)-closed graphs.Öğe ON A FINER TOPOLOGICAL SPACE THAN ?? AND SOME MAPS(Forum Editrice Univ Udinese, 2010) Ekici, E.; Jafari, S.; Latif, R. M.In 1943, Fomin [7] introduced the notion of theta-continuity. In 1966, the notions of theta-open subsets, theta-closed subsets and theta-closure were introduced by Velieko [18] for the purpose of studying the important class of H-closed spaces in terms of arbitrary filterbases. He also showed that the collection of theta-open sets in a topological space (X,tau) forms a topology on X denoted by tau(theta) (see also [12]). Dickman and Porter [4], [5], Joseph [11] continued the work of Velieko. Noiri and Jafari [15], Caldas et al. [1] and [2], Steiner [16] and Cao et al [3] have also obtained several new and interesting results related to these sets. In this paper, we will offer a finer topology on X than tau(theta) by utilizing the new notions of omega(theta)-open and omega(theta)-closed sets. We will also discuss some of the fundamental properties of such sets and some related maps.Öğe On a finer topological space than τ θ and some maps(2010) Ekici, E.; Jafari, S.; Latif, R.M.In 1943, Fomin 7 introduced the notion of ?-continuity. In 1966, the notions of ?-open subsets, ?-closed subsets and ?-closure were introduced by Veli?ko 18 for the purpose of studying the important class of H-closed spaces in terms of arbitrary filterbases. He also showed that the collection of ?-open sets in a topological space (X; ?) forms a topology on X denoted by ? ? (see also 12). Dickman and Porter 4, 5, Joseph 11 continued the work of Veli?ko. Noiri and Jafari 15, Caldas et al. 1 and 2, Steiner 16 and Cao et al 3 have also obtained several new and interesting results related to these sets. In this paper, we will off a finer topology on X than ?? by utilizing the new notions of ??-open and ??-closed sets. We will also discuss some of the fundamental properties of such sets and some related maps.Öğe On Almost Contra-Continuous Multifunctions(Maik Nauka/Interperiodica/Springer, 2009) Ekici, E.; Jafari, S.; Popa, V.In this paper, we introduce and study the notion of almost contra-continuous multifunctions. Characterizations and properties of almost contra-continuous multifunctions are discussed.Öğe On C*-sets and decompositions of continuous and ??-continuous(Akademiai Kiado, 2007) Ekici, E.The main purpose of this paper is to introduce the concepts of C*-sets, C*-continuous functions and to obtain new decompositions of continuous and eta zeta-continuous functions. Moreover, properties of C*-sets and some properties of C-sets are discussed.Öğe ON FUZZY UPPER AND LOWER CONTRA-CONTINUOUS MULTIFUNCTIONS(Univ Sistan & Baluchestan, 2011) Alimohammady, M.; Ekici, E.; Jafari, S.; Roohi, M.This paper is devoted to the concepts of fuzzy upper and fuzzy lower contra-continuous multifunctions and also some characterizations of them are considered.Öğe On fuzzy upper and lower contra-continuous multifunctions(2011) Alimohammady, M.; Ekici, E.; Jafari, S.; Roohi, M.This paper is devoted to the concepts of fuzzy upper and fuzzy lower contra-continuous multifunctions and also some characterizations of them are considered.Öğe On Quasi (g)over-tildes-open and Quasi (g)over-tildes-closed Functions(Malaysian Mathematical Sciences Soc, 2008) Rajesh, N.; Ekici, E.The purpose of this paper is to give a new type of open function called quasi (g) over tildes-open function. Also, we obtain its characterizations and its basic properties.Öğe On quasi g?s-open and quasi g?s-closed Functions(2008) Rajesh, N.; Ekici, E.The purpose of this paper is to give a new type of open function called quasi g?s-open function. Also, we obtain its characterizations and its basic properties.Öğe ON WEAK STRUCTURES DUE TO CSASZAR(Springer, 2012) Ekici, E.In [4], Csaszar has introduced the notions of weak structures and the structures alpha(w), pi(w), sigma(w), beta(w). The main aim of this paper is to introduce and study properties of the structures r(w), alpha(w), pi(w), sigma(w) and beta(w).Öğe On weakly BR-open functions and their characterizations in topological spaces(Warsaw University, 2011) Caldas, M.; Ekici, E.; Jafari, S.; Latif, R.M.In this paper, we introduce and study a new class of functions by using the notions of b-?-open sets and b-?-closure operator called weakly BR-open functions. The connections between this function and the other existing topological functions are studied.Öğe ON WEAKLY BR-OPEN FUNCTIONS AND THEIR CHARACTERIZATIONS IN TOPOLOGICAL SPACES(De Gruyter Open Ltd, 2011) Caldas, M.; Ekici, E.; Jafari, S.; Latif, R. M.In this paper, we introduce and study a new class of functions by using the notions of b-theta-open sets and b-theta-closure operator called weakly BR-open functions. The connections between this function and the other existing topological functions are studied.Öğe Optimization of process parameters for micro milling of Ti-6Al-4V alloy using Taguchi-based gray relational analysis(Elsevier Sci Ltd, 2018) Aslantas, K.; Ekici, E.; Cicek, A.In this study, the effects of the cutting parameters on the surface quality and burr width were investigated in the micro milling of Ti-6Al-4V alloy. Spindle speed, feed per tooth and depth of cut are selected as the control factors. Taguchi-based gray relational analysis was used in the optimization of the cutting parameters for minimal burr width (for up and down milling operations) and surface roughness (Ra). The contribution percentages of the control factors were determined by using analysis of variance (ANOVA). According to the obtained results, it was determined that the feed rate value for the best surface quality was 0.25 mu m/tooth. At lower feed rate values, ploughing takes place and the surface quality deteriorates. On the other hand, it was found that it is more appropriate to use values a(p) of 0.1mm and n of 10,000 rev/min to produce minimal Ra. The burr width on the down milling side is higher than that on the up milling side. A lower feed rate and greater depth of cut lead to an increase in burr width. In addition, higher spindle speeds increased the burr width due to rapid tool wear.
