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Search Results: 1 - 10 of 21 matches for " Watcharaporn Cholamjiak "
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Monotone Hybrid Projection Algorithms for an Infinitely Countable Family of Lipschitz Generalized Asymptotically Quasi-Nonexpansive Mappings
Watcharaporn Cholamjiak,Suthep Suantai
Abstract and Applied Analysis , 2009, DOI: 10.1155/2009/297565
Abstract: We prove a weak convergence theorem of the modified Mann iteration process for a uniformly Lipschitzian and generalized asymptotically quasi-nonexpansive mapping in a uniformly convex Banach space. We also introduce two kinds of new monotone hybrid methods and obtain strong convergence theorems for an infinitely countable family of uniformly Lipschitzian and generalized asymptotically quasi-nonexpansive mappings in a Hilbert space. The results improve and extend the corresponding ones announced by Kim and Xu (2006) and Nakajo and Takahashi (2003).
A Hybrid Method for a Countable Family of Multivalued Maps, Equilibrium Problems, and Variational Inequality Problems
Watcharaporn Cholamjiak,Suthep Suantai
Discrete Dynamics in Nature and Society , 2010, DOI: 10.1155/2010/349158
Abstract: We introduce a new monotone hybrid iterative scheme for finding a common element of the set of common fixed points of a countable family of nonexpansive multivalued maps, the set of solutions of variational inequality problem, and the set of the solutions of the equilibrium problem in a Hilbert space. Strong convergence theorems of the purposed iteration are established. 1. Introduction Let be a nonempty convex subset of a Banach spaces . Let be a bifunction from to , where is the set of all real numbers. The equilibrium problem for is to find such that for all . The set of such solutions is denoted by . The set is called proximal if for each , there exists an element such that , where . Let , , and denote the families of nonempty closed bounded subsets, nonempty compact subsets, and nonempty proximal bounded subsets of , respectively. The Hausdorff metric on is defined by for . A single-valued map is called nonexpansive if for all . A multivalued map is said to be nonexpansive if for all . An element is called a fixed point of (resp., ) if (resp., ). The set of fixed points of is denoted by . The mapping is called quasi-nonexpansive [1] if and for all and all . It is clear that every nonexpansive multivalued map with is quasi-nonexpansive. But there exist quasi-nonexpansive mappings that are not nonexpansive; see [2]. The mapping is called hemicompact if, for any sequence in such that as , there exists a subsequence of such that . We note that if is compact, then every multivalued mapping is hemicompact. A mapping is said to satisfy Condition (I) if there is a nondecreasing function with , for such that for all . In 1953, Mann [3] introduced the following iterative procedure to approximate a fixed point of a nonexpansive mapping in a Hilbert space : where the initial point is taken in arbitrarily and is a sequence in . However, we note that Mann's iteration process (1.3) has only weak convergence, in general; for instance, see [4–6]. In 2003, Nakajo and Takahashi [7] introduced the method which is the so-called CQ method to modify the process (1.3) so that strong convergence is guaranteed. They also proved a strong convergence theorem for a nonexpansive mapping in a Hilbert space. Recently, Tada and Takahashi [8] proposed a new iteration for finding a common element of the set of solutions of an equilibrium problem and the set of fixed points of a nonexpansive mapping in a Hilbert space . In 2005, Sastry and Babu [9] proved that the Mann and Ishikawa iteration schemes for multivalued map with a fixed point converge to a fixed point of under certain
On Ishikawa-type iteration with errors for a continuous real function on an arbitrary interval
Prasit Cholamjiak
Applied Mathematical Sciences , 2013,
Abstract: We consider the Ishikawa-type iteration process with errors for acontinuous real function on an arbitrary interval and prove the convergencetheorem. Furthermore, we give numerical examples to comparewith Mann and Ishikawa iteration processes with error sequences.
A projection method for relatively nonexpansive mappings in Banach spaces
Prasit Cholamjiak
Applied Mathematical Sciences , 2013,
Abstract: We introduce a new projection algorithm for solving the fixed pointproblem of relatively nonexpansive mappings in the framework of Banachspaces. We also prove the strong convergence theorem for suchmappings.
A Hybrid Iterative Scheme for Equilibrium Problems, Variational Inequality Problems, and Fixed Point Problems in Banach Spaces
Cholamjiak Prasit
Fixed Point Theory and Applications , 2009,
Abstract: The purpose of this paper is to introduce a new hybrid projection algorithm for finding a common element of the set of solutions of the equilibrium problem and the set of the variational inequality for an inverse-strongly monotone operator and the set of fixed points of relatively quasi-nonexpansive mappings in a Banach space. Then we show a strong convergence theorem. Using this result, we obtain some applications in a Banach space.
A Hybrid Iterative Scheme for Equilibrium Problems, Variational Inequality Problems, and Fixed Point Problems in Banach Spaces
Prasit Cholamjiak
Fixed Point Theory and Applications , 2009, DOI: 10.1155/2009/719360
Abstract: The purpose of this paper is to introduce a new hybrid projection algorithm for finding a common element of the set of solutions of the equilibrium problem and the set of the variational inequality for an inverse-strongly monotone operator and the set of fixed points of relatively quasi-nonexpansive mappings in a Banach space. Then we show a strong convergence theorem. Using this result, we obtain some applications in a Banach space.
Anti-Oxidative, Anti-Hyperglycemic and Lipid-Lowering Effects of Aqueous Extracts of Ocimum sanctum L. Leaves in Diabetic Rats  [PDF]
Thamolwan Suanarunsawat, Watcharaporn Devakul Na Ayutthaya, Suwan Thirawarapan, Somlak Poungshompoo
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.59090
Abstract:

The present study was conducted to investigate the effect of aqueous extracts of Ocimum sanctum L. leaves on blood glucose, serum lipid profile and anti-oxidative activity to protect various risk organs in DM rats. Ocimum sanctum L. leaves were extracted using water, then the total phenolic content was determined. Three groups of male Wistar rats were used including normal control rats, DM rats and DM rats daily fed with aqueous extracts of Ocimum sanctum L. leaves (AQOS) for three weeks. DM rats were induced by intraperitoneal injection of streptozotocin (65 mg/kgbw). The results show that three weeks of diabetic induction increased blood glucose, serum lipid profile and serum levels of AST, ALT, ALP, LDH, CK-MB, creatinine and BUN. AQOS significantly decreased blood glucose, serum lipid profile and serum levels of AST, ALT, ALP, LDH, CK-MB, creatinine and BUN. The low level of serum insulin was also raised by AQOS. AQOS suppressed high TBARS level and raised the activities of antioxidant enzymes in the liver, kidney and cardiac tis- sues. Histopathological results show that AQOS preserved the liver, kidney and myocardial tissues. It can be concluded that AQOS had anti-hyperglycemic, anti-hyperlipidemic, and free radical sca- venging effects providing organ protection from diabetes. The phenolic compounds contained in AQOS might be responsible for these activities.

Convergence Analysis for a System of Equilibrium Problems and a Countable Family of Relatively Quasi-Nonexpansive Mappings in Banach Spaces
Prasit Cholamjiak,Suthep Suantai
Abstract and Applied Analysis , 2010, DOI: 10.1155/2010/141376
Abstract: We introduce a new hybrid iterative scheme for finding a common element in the solutions set of a system of equilibrium problems and the common fixed points set of an infinitely countable family of relatively quasi-nonexpansive mappings in the framework of Banach spaces. We prove the strong convergence theorem by the shrinking projection method. In addition, the results obtained in this paper can be applied to a system of variational inequality problems and to a system of convex minimization problems in a Banach space. 1. Introduction Let be a real Banach space, and let be the dual of . Let be a closed and convex subset of . Let be bifunctions from to , where is the set of real numbers and is an arbitrary index set. The system of equilibrium problems is to find such that If is a singleton, then problem (1.1) reduces to find such that The set of solutions of the equilibrium problem (1.2) is denoted by . Combettes and Hirstoaga [1] introduced an iterative scheme for finding a common element in the solutions set of problem (1.1) in a Hilbert space and obtained a weak convergence theorem. In 2004, Matsushita and Takahashi [2] introduced the following algorithm for a relatively nonexpansive mapping in a Banach space : for any initial point , define the sequence by where is the duality mapping on , is the generalized projection from onto , and is a sequence in . They proved that the sequence converges weakly to fixed point of under some suitable conditions on . In 2008, Takahashi and Zembayashi [3] introduced the following iterative scheme which is called the shrinking projection method for a relatively nonexpansive mapping and an equilibrium problem in a Banach space : They proved that the sequence converges strongly to under some appropriate conditions. 2. Preliminaries and Lemmas Let be a real Banach space, and let be the unit sphere of . A Banach space is said to be strictly convex if, for any , It is also said to be uniformly convex if, for each , there exists such that, for any , It is known that a uniformly convex Banach space is reflexive and strictly convex. The function which is called the modulus of convexity of is defined as follows: The space is uniformly convex if and only if for all . A Banach space is said to be smooth if the limit exists for all . It is also said to be uniformly smooth if the limit (2.4) is attained uniformly for . The duality mapping is defined by for all . If is a Hilbert space, then , where is the identity operator. It is also known that, if is uniformly smooth, then is uniformly norm-to-norm continuous on bounded subset
A New Hybrid Algorithm for Variational Inclusions, Generalized Equilibrium Problems, and a Finite Family of Quasi-Nonexpansive Mappings
Prasit Cholamjiak,Suthep Suantai
Fixed Point Theory and Applications , 2009, DOI: 10.1155/2009/350979
Abstract: We proposed in this paper a new iterative scheme for finding common elements of the set of fixed points of a finite family of quasi-nonexpansive mappings, the set of solutions of variational inclusion, and the set of solutions of generalized equilibrium problems. Some strong convergence results were derived by using the concept of W-mappings for a finite family of quasi-nonexpansive mappings. Strong convergence results are derived under suitable conditions in Hilbert spaces.
A New Hybrid Algorithm for Variational Inclusions, Generalized Equilibrium Problems, and a Finite Family of Quasi-Nonexpansive Mappings
Cholamjiak Prasit,Suantai Suthep
Fixed Point Theory and Applications , 2009,
Abstract: We proposed in this paper a new iterative scheme for finding common elements of the set of fixed points of a finite family of quasi-nonexpansive mappings, the set of solutions of variational inclusion, and the set of solutions of generalized equilibrium problems. Some strong convergence results were derived by using the concept of -mappings for a finite family of quasi-nonexpansive mappings. Strong convergence results are derived under suitable conditions in Hilbert spaces.
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