Old News

※Please see Top for resent news.

• 2018/09/23: You can see a full-text view-only version of our paper “Convergence analysis of iterative methods for nonsmooth convex optimization over fixed point sets of quasi-nonexpansive mappings” in Mathematical Programming by using this link.
• 2018/06/01: URL of our website has been moved to https://iiduka.net. Your browser will be automatically forwarded to new URLs when you access old ones.

• 2017/11/02: Please use this link which will provide free access to our article “Optimality and convergence for convex ensemble learning with sparsity and diversity based on fixed point optimization”, and is valid for 50 days, until December 22, 2017.
• 2017/11/01: Our article “Optimality and convergence for convex ensemble learning with sparsity and diversity based on fixed point optimization” (PDF) has been accepted for publication in the Neurocomputing. It proposes sparsity and diversity learning methods with fixed point optimization algorithms. Please see PDF.

• 2016/10/20: Our article “Almost Sure Convergence of Random Projected Proximal and Subgradient Algorithms for Distributed Nonsmooth Convex Optimization” (PDF) has been accepted for publication in the Optimization.
• 2016/08/14: Our article “Convergence analysis of iterative methods for nonsmooth convex optimization over fixed point sets of quasi-nonexpansive mappings” has now been published in Mathematical Programming, 159(1), 509-538.
• 2016/07/09: Our paper “Line Search Fixed Point Algorithms Based on Nonlinear Conjugate Gradient Directions: Application to Constrained Smooth Convex Optimization” (PDF) has been accepted for publication in the Fixed Point Theory and Applications.
• 2016/04/14: Please use this link which will provide free access to our article Proximal Point Algorithms for Nonsmooth Convex Optimization with Fixed Point Constraints, and is valid for 50 days, until June 2, 2016.
• 2016/04/03: Our paper “Incremental Subgradient Method for Nonsmooth Convex Optimization with Fixed Point Constraints” (PDF) has been accepted for publication in the Optimization Methods and Software. Please see Section 5 in Proximal Point Algorithms for Nonsmooth Convex Optimization with Fixed Point Constraints for the numerical comparisons of the proposed subgradient method with the proximal point ones.
• 2016/04/02: Our paper “Proximal Point Algorithms for Nonsmooth Convex Optimization with Fixed Point Constraints” is now available online.
• 2016/03/01: Our paper “Proximal Point Algorithms for Nonsmooth Convex Optimization with Fixed Point Constraints” (PDF) has been accepted for publication in the European Journal of Operational Research.
• 2016/01/29: Our paper Optimization for Inconsistent Split Feasibility Problems has been published on Taylor & Francis Online.
• 2016/01/05: We wish you a very happy New Year!

• 2015/11/27: Our paper “Convergence Analysis of Iterative Methods for Nonsmooth Convex Optimization over Fixed Point Sets of Quasi-Nonexpansive Mappings” (PDF extended version) has been accepted for publication in Mathematical Programming.
• 2015/11/03: Our paper “Distributed Convex Optimization Algorithms and Their Application to Distributed Control in Peer-to-Peer Data Storage System” (PDF) has been accepted for publication in Journal of Nonlinear and Convex Analysis: Special Issue-Dedicated to Wataru Takahashi on the occasion of his 70th birth day.
• 2015/08/03: Our paper “Optimization for Inconsistent Split Feasibility Problems” (PDF) has been accepted for publication in Numerical Functional Analysis and Optimization. This is the first paper to deal with the inconsistent multiple-set split feasibility problem and to provide a compromise solution in a novel and useful way (excerpt from reviewer's comments). Please see PDF file of the paper.
• 201５/07/11: The programming contest team Theory of Computing Lab. composed of our students is decided to participate in ACM-ICPC Asia Regional Contest 201５. The team won 19th prize in the ACM-ICPC Domestic Preliminary Contest 201５.
• 2015/06/12: Our paper “Parallel Subgradient Method for Nonsmooth Convex Optimization with a Simple Constraint” (PDF) has been accepted for publication in the new international journal, Linear and Nonlinear Analysis.
• 2015/05/16: Our article “Parallel computing subgradient method for nonsmooth convex optimization over the intersection of fixed point sets of nonexpansive mappings” (PDF) has been accepted for publication in Fixed Point Theory and Applications. This article proposes a parallel subgradient method for minimizing the sum of nondifferentiable, convex functions over the fixed point sets of nonexpansive mappings and studies its convergence properties for the two step-size rules, a constant step size and a diminishing step size. Please see PDF if you are interested in the article.
• 2015/01/20: Our article “Acceleration method for convex optimization over the fixed point set of a nonexpansive mapping” has now been published in the following paginated issue of Mathematical Programming: Volume 149, Issue 1 (2015), Page 131-165.

• 2014/12/31: Our paper “Convex Optimization over Fixed Point Sets of Quasi-nonexpansive and Nonexpansive Mappings in Utility-Based Bandwidth Allocation Problems with Operational Constraints” (PDF) has been accepted for publication in Journal of Computational and Applied Mathematics.
• 2014/11/05: Our article, “Acceleration Method Combining Broadcast and Incremental Distributed Optimization Algorithms,” has been published online in SIAM Journal on Optimization (Vol. 24, Issue 4).
• 2014/10/29: Our paper entitled Distributed Iterative Methods for Solving Nonmonotone Variational Inequality over the Intersection of Fixed Point Sets of Nonexpansive Mappings published in Pacific Journal of Optimization can be seen in Open Access (until 30 Nov).
• 2014/09/30: We can see the final version of the paper Acceleration of the Halpern Algorithm to Search for a Fixed Point of a Nonexpansive Mapping.
• 2014/09/04: Our paper entitled “Acceleration of the Halpern Algorithm to Search for a Fixed Point of a Nonexpansive Mapping”（PDF）has been accepted for publication in Fixed Point Theory and Applications.
• 2014/09/01: Professor Iiduka received the 4th Research Encourage Award from the Operations Research Society of Japan.
• 2014/07/21: Our paper entitled “Acceleration Method Combining Broadcast and Incremental Optimization Algorithms”（PDF）has been accepted for publication in SIAM Journal on Optimization.
• 2014/05/17: We now go online Fixed Point Algorithms page! If you are interested, please click on Fixed Point Algorithms page.
• 2014/04/26: We held a videogame party with Prof. Iiduka's sons.
• 2014/02/25: Our paper entitled “Approximate Solutions to Variational Inequality over the Fixed Point Set of a Strongly Nonexpansive Mapping (PDF)” has been accepted for publication in Fixed Point Theory and Applications.
• 2014/02/10: Our paper entitled “Distributed Iterative Methods for Solving Nonmonotone Variational Inequality over the Intersection of Fixed Point Sets of Nonexpansive Mappings (PDF)” has been accepted for publication in Pacific Journal of Optimization.
• 2014/01/13: We can see online our paper Acceleration method for convex optimization over the fixed point set of a nonexpansive mapping published in Mathematical Programming.