Old News [数理最適化研究室]

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====== Old News ======
※Please see [[:en|Top]] for resent news.

===== 2018 =====
  * 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 [[https://rdcu.be/7uNw|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 =====
  * 2017/11/02: Please use [[https://authors.elsevier.com/c/1V~dr3INuk2mRE|this link]] which will provide free access to our article  "[[http://www.sciencedirect.com/science/article/pii/S0925231217313486|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 "[[http://www.sciencedirect.com/science/article/pii/S0925231217313486|Optimality and convergence for convex ensemble learning with sparsity and diversity based on fixed point optimization]]" ({{:iiduka:h_i_neucom2017.pdf|PDF}}) has been accepted for publication in the [[https://www.journals.elsevier.com/neurocomputing/|Neurocomputing]]. It proposes sparsity and diversity learning methods with fixed point optimization algorithms. Please see {{:iiduka:h_i_neucom2017.pdf|PDF}}.  

===== 2016 =====
  * 2016/10/20: Our article "Almost Sure Convergence of Random Projected Proximal and Subgradient Algorithms for Distributed Nonsmooth Convex Optimization" ({{:iiduka:GOPT_iiduka.pdf|PDF}}) has been accepted for publication in the [[http://www.tandfonline.com/toc/gopt20/current|Optimization]].
  * 2016/08/14: Our article "[[http://link.springer.com/article/10.1007/s10107-015-0967-1|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" ([[http://download.springer.com/static/pdf/569/art%253A10.1186%252Fs13663-016-0567-7.pdf?originUrl=http%3A%2F%2Ffixedpointtheoryandapplications.springeropen.com%2Farticle%2F10.1186%2Fs13663-016-0567-7&token2=exp=1468029750~acl=%2Fstatic%2Fpdf%2F569%2Fart%25253A10.1186%25252Fs13663-016-0567-7.pdf*~hmac=c724b9129b32b7290cb6fd768ed09e09af38f0b498f645e497cdd990cca839af|PDF]]) has been accepted for publication in the [[http://fixedpointtheoryandapplications.springeropen.com/|Fixed Point Theory and Applications]]. 
  * 2016/04/14: Please use [[http://authors.elsevier.com/a/1St4Y1LnJ6PjKk|this link]] which will provide free access to our article [[http://www.sciencedirect.com/science/article/pii/S0377221716301102|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" ({{:iiduka:OMS2016.pdf|PDF}}) has been accepted for publication in the [[http://www.tandfonline.com/action/journalInformation?show=aimsScope&journalCode=goms20#.VwB9oxOLT3B|Optimization Methods and Software]]. Please see Section 5 in [[http://www.sciencedirect.com/science/article/pii/S0377221716301102|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 "[[http://www.sciencedirect.com/science/article/pii/S0377221716301102|Proximal Point Algorithms for Nonsmooth Convex Optimization with Fixed Point Constraints]]" is now available online.
  * 2016/03/01: Our paper "[[http://www.sciencedirect.com/science/article/pii/S0377221716301102|Proximal Point Algorithms for Nonsmooth Convex Optimization with Fixed Point Constraints]]" ({{:iiduka:iiduka_EJOR.pdf|PDF}}) has been accepted for publication in the [[http://www.journals.elsevier.com/european-journal-of-operational-research/|European Journal of Operational Research]].
  * 2016/01/29: Our paper [[http://www.tandfonline.com/doi/full/10.1080/01630563.2015.1080270|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 =====
  * 2015/11/27: Our paper "Convergence Analysis of Iterative Methods for Nonsmooth Convex Optimization over Fixed Point Sets of Quasi-Nonexpansive Mappings" ({{:iiduka:mp_iiduka2015.pdf|PDF}} [[http://arxiv.org/pdf/1510.06148.pdf|extended version]]) has been accepted for publication in [[http://www.springer.com/mathematics/journal/10107|Mathematical Programming]]. 
  * 2015/11/03: Our paper "Distributed Convex Optimization Algorithms and Their Application to Distributed Control in Peer-to-Peer Data Storage System" ({{:iiduka:jncav16n11.pdf|PDF}}) has been accepted for publication in [[http://www.ybook.co.jp/jnca.html|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" ({{:iiduka:LNFA-2013-0155.pdf|PDF}}) has been accepted for publication in [[http://www.tandfonline.com/toc/lnfa20/current#.Vb7itJPtlBd|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 {{:iiduka:LNFA-2013-0155.pdf|PDF}} file of the paper.
  * 201５/07/11: The programming contest team [[http://www.th.cs.meiji.ac.jp|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" ({{:kaz:lnav1n1hi-ii-12.pdf|PDF}}) has been accepted for publication in the new international journal, [[http://www.ybook.co.jp/lna.html|Linear and Nonlinear Analysis]].
  * 2015/05/16: Our article "[[http://www.fixedpointtheoryandapplications.com/content/2015/1/72|Parallel computing subgradient method for nonsmooth convex optimization over the intersection of fixed point sets of nonexpansive mappings]]" ([[http://www.fixedpointtheoryandapplications.com/content/pdf/s13663-015-0319-0.pdf|PDF]]) has been accepted for publication in [[http://www.fixedpointtheoryandapplications.com/|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  [[http://www.fixedpointtheoryandapplications.com/content/pdf/s13663-015-0319-0.pdf|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: [[http://link.springer.com/article/10.1007%2Fs10107-013-0741-1|Volume 149, Issue 1 (2015), Page 131-165]].

===== 2014 =====
  * 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"  ({{:iiduka:iiduka_cam2014.pdf|PDF}}) has been accepted for publication in [[http://www.journals.elsevier.com/journal-of-computational-and-applied-mathematics/|Journal of Computational and Applied Mathematics]].
  * 2014/11/05: Our article, "[[http://epubs.siam.org/doi/abs/10.1137/130939560|Acceleration Method Combining Broadcast and Incremental Distributed Optimization Algorithms]]," has been published online in [[http://epubs.siam.org/toc/sjope8/24/4|SIAM Journal on Optimization]] (Vol. 24, Issue 4).   
  * 2014/10/29: Our paper entitled [[http://www.ybook.co.jp/online2/oppjo/vol10/p691.html|Distributed Iterative Methods for Solving Nonmonotone Variational Inequality over the Intersection of Fixed Point Sets of Nonexpansive Mappings]] published in [[http://www.ybook.co.jp/|Pacific Journal of Optimization]] can be seen in [[http://www.ybook.co.jp/online-p/PJO/Open/v10n4/pjov10n4p691-oa/FLASH/index.html|Open Access]] (until 30 Nov).
  * 2014/09/30: We can see {{:iiduka:fpta2014_2.pdf|the final version}} of the paper [[http://www.fixedpointtheoryandapplications.com/content/2014/1/202|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"（{{:iiduka:sakurai_iiduka_2014.pdf|PDF}}）has been accepted for publication in [[http://www.fixedpointtheoryandapplications.com/|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"（{{:iiduka:iiduka_hishinuma2013.pdf|PDF}}）has been accepted for publication in [[http://www.siam.org/journals/siopt.php|SIAM Journal on Optimization]].
  * 2014/05/17: We now go online [[en:intro:researches:fixedpoint|Fixed Point Algorithms]] page! If you are interested, please click on [[en:intro:researches:fixedpoint|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 ({{:iiduka:FPTA2014.pdf|PDF}})" has been accepted for publication in [[http://www.fixedpointtheoryandapplications.com|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 ({{:iiduka:iiduka_PJO.pdf|PDF}})" has been accepted for publication in [[http://www.ybook.co.jp/pjo.html|Pacific Journal of Optimization]].
  * 2014/01/13: We can see online our paper [[http://link.springer.com/article/10.1007/s10107-013-0741-1|Acceleration method for convex optimization over the fixed point set of a nonexpansive mapping]] published in [[http://www.springer.com/mathematics/journal/10107|Mathematical Programming]].