Search Results 1-20 of 632

  • Bounding linear rainfall-runoff models with fractional derivatives applied to a barren catchment of the Jordan Rift Valley

    Unami Koichi , Fadhil Rasha M , Mohawesh Osama

    … Firstly, a pair of linear autoregressive models with exogenous input (ARX models) is identified to tightly bound each runoff time series using the simplex method of linear programming. … Finally, a nominal model from which actual nonlinear and stochastic phenomena perturb is arranged to envelope the all upper bounding rainfall-runoff models in the frequency domain, leading to the formulation of a challenging fractional optimal control problem involving stochastic processes. …

    Journal of Hydrology (593), 2021-02

    IR 

  • Autonomous Parameter Design for Cascade-Structure Feedback Controller Based on Cooperative Optimization Method

    Kuroda Eitaro , Maeda Yoshihiro , Iwasaki Makoto

    … Designing fine parameters for a cascade-structure FB controller that realizes a wide control bandwidth is a nonconvex optimization problem owing to the nonlinear relations between the parameters. … In conventional parameter design methods based on nonlinear optimization techniques, the obtained parameters strongly depend on the initial point, which requires considerable labor for trial and error-based initial point setting in industry. …

    IEEJ Journal of Industry Applications, 2021

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  • A HOMOTOPY ALGORITHM FOR SOLVING ENTROPY MAXIMIZATION PROBLEM OF OD MATRIX ESTIMATION  [in Japanese]

    MOGI Wataru

    <p>既存の OD 交通量データと起終点間の経路選択確率が先験値として得られているときに,道路ネットワーク上の観測リンク交通量から OD 表を逆推定する手法として,残差平方和最小化モデルやエントロピー最大化モデルなどが開発されている.これらの手法のうち,エントロピー最大化モデルについては,制約条件付き非線形計画問題もしくはその最適性条件である非線形連立方程式を数値的に解く必要があり,解 …

    Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management) 76(5), I_837-I_846, 2021

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  • Optimal Position and Attitude Control of Quadcopter Using Stochastic Differential Dynamic Programming with Input Saturation Constraints

    Satoh Satoshi , Saijo Hironori , Yamada Katsuhiko

    … Basic quadcopter dynamics is modeled as a nonlinear stochastic system described by a stochastic differential equation. … Subsequently, the position and attitude control is formulated as a nonlinear stochastic optimal control problem with input saturation constraints. … To solve this problem, a continuous-time stochastic differential dynamic programming (DDP) method with input saturation constraints is newly proposed. …

    Journal of Robotics and Mechatronics 33(2), 283-291, 2021

    J-STAGE 

  • An Attendance Report on The 2018 International Symposium on Nonliner Theory and Its Applications(Reports of Overseas Activities)  [in Japanese]

    松浦 隆文

    … We describe an attendance report for the 2018 International Symposium on Nonlinear Theory and Its Applications(NOLTA2018). … In order to find the shortest tour of vehicles in a bike sharing system, we have already proposed a Multiple-Vehicle Bicycle Sharing System Routing Problem( mBSSRP). … For 30 ports problem, an optimal solution can be found within a few minutes using a general purpose of mixed integer programming solver such as a gurobi optimizer. …

    日本工業大学研究報告 = Report of researches, Nippon Institute of Technology 49(4), 100-102, 2020-03

    IR 

  • ENERGY PLANT OPERATION AND INSTALLATION PLANNING VIA STOCHASTIC PROGRAMMING  [in Japanese]

    Fukuba Tomoki , Shiina Takayuki , Tokoro Ken-ichi

    <p>本研究では,太陽光発電と蓄電池を導入した場合の大規模施設でのエネルギープラント運用計画の最適化モデルを開発する.太陽光発電の出力の不確実性を,確率計画法を用いて離散シナリオで表現し,運用費用の期待値を最小化する.本研究モデルは,現実的な運用計画のために必要な非線形制約を含むため,大規模な非線形混合整数計画問題となる.その非線形制約に対して区分線形近似を導入することで,大規模な混合 …

    Transactions of the Operations Research Society of Japan 63(0), 1-17, 2020

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  • Robust optimization of structures subjected to frictionless unilateral contact with uncertain initial gaps

    KANNO Yoshihiro

    … <p>This short paper studies a robust optimization problem of a structure subjected to frictionless unilateral contacts. … It is often that a structural optimization problem involving contact conditions is formulated as a mathematical programming problem with complementarity constraints (an MPCC problem). …

    Mechanical Engineering Letters 6(0), 20-00224-20-00224, 2020

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  • LIMIT OPERATION IN PROJECTIVE SPACE FOR CONSTRUCTING NECESSARY OPTIMALITY CONDITION OF POLYNOMIAL OPTIMIZATION PROBLEM

    Iori Tomoyuki , Ohtsuka Toshiyuki

    制約想定を必要としない新しい最適性必要条件の導出 --すべての最適解が満たす方程式の新しい導出方法を提案--. 京都大学プレスリリース. 2020-11-09.

    Journal of the Operations Research Society of Japan 63(4), 114-133, 2020

    IR  J-STAGE 

  • Optimal Operation of Heat Supply Systems with Piping Network by a Mixed-Integer Nonlinear Model  [in Japanese]

    MIYAMOTO Kohei , YOKOYAMA Ryohei , WAKUI Tetsuya

    … However, it is difficult to find the optimal operational strategy of such a heat supply system with piping network because of its discrete and nonlinear characteristics. … In this paper, the optimal operational strategy is investigated by a mixed-integer nonlinear programming approach. … This optimization problem is solved efficiently by a hierarchical optimization method. …

    The Proceedings of Conference of Kansai Branch 2020.95(0), 01_116, 2020

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  • Integral Function to Optimize Mass Exchange Network Synthesis Model

    Hou Chuang , Xu Wenxing , Luo Mingsheng

    … To solve this problem, an integral function is added to the mathematical model to obtain the optimal MEN structure in this study. …

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 53(6), 254-266, 2020

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  • Partitioning Method for the Large-scale Operation Planning Problem of a District Heating and Cooling System for Electricity Adjustment  [in Japanese]

    Tomita Kohei , Iino Yutaka , Hayashi Yasuhiro , Yamamoto Yuto , Kobayashi Kosuke , Hayakawa Atsuhiko

    … However, because it was a daily optimal operation planning problem, it was not possible to consider the operation continuity of multiple days. … However, the mixed integer non-linear programming problem (MINLP) considering the unit commitment (UC) constraints of each device has a huge computational load. …

    IEEJ Transactions on Power and Energy 140(2), 94-103, 2020

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  • On-line Energy Plant Optimal Operation Planning by Dependable Parallel Multi-population IBSODE  [in Japanese]

    新井 馨 , 福山 良和 , 飯坂 達也 , 松井 哲郎

    電気学会研究会資料. SMF = The papers of Technical Meeting on Smart Facilities, IEE Japan 2019(52-56・58-69), 67-72, 2019-11-05

  • On-line Energy Plant Optimal Operation Planning by Dependable Parallel Multi-population IBSODE  [in Japanese]

    新井 馨 , 福山 良和 , 飯坂 達也 , 松井 哲郎

    電気学会研究会資料. ST 2019(27-31・33-44), 67-72, 2019-11-05

  • APPLICATION OF ACCELERATED GRADIENT METHOD TO EQUILIBRIUM ANALYSIS OF TRUSSES WITH NONLINEAR ELASTIC MATERIALS  [in Japanese]

    FUJITA Shinnosuke , KANNO Yoshihiro

    … Optimization methods are roughly classified into heuristic methods typified by genetic algorithms and mathematical programming methods. … Along with the development of computers, mathematical programming methods have been developed dramatically and are used in various fields as a solution to optimization problems. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (763), 1223-1230, 2019-09

    J-STAGE  AIJ 

  • Robust minimax optimization problems with applications (Nonlinear Analysis and Convex Analysis)

    Jiao Liguo , Kim Do Sang

    … In this paper, we study the optimality conditions and duality in minimax programming problems in the face of data uncertainty. … Following the robust optimization approach (worst-case approach), we formulate its robust counterpart of the minimax programming problems under data uncertainty. … Then, by using the obtained result, we propose the necessary condition for optimal solutions of the considered problem; …

    数理解析研究所講究録 (2114), 96-102, 2019-05

    IR 

  • SHAPE AND TOPOLOGY OPTIMIZATION OF LATTICED SHEAR WALL UTILISING CONTACT TO EXISTING FRAME  [in Japanese]

    KIMURA Toshiaki , OHSAKI Makoto , YAMAOKA Yuki

    … Since a nonlinear programming approach is used, very thin lattice members existed in the optimal solutions. … In each phase, an optimization problem is formulated to maximize the lateral reaction force for specified inter-story drift angle. … Simulated Annealing (SA) is used for solving the optimization problem. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (757), 385-391, 2019-03

    J-STAGE  AIJ 

  • Modulation-Adaptive Link-Disjoint Path Selection Model for 1 + 1 Protected Elastic Optical Networks

    Yuto Kishi , Nattapong Kitsuwan , Hiro Ito , Bijoy Chand Chatterjee , Eiji Oki

    … When an optical path is configured, the number of required spectrum slots is determined based on the nonlinear relationship between the optical path length and the number of utilized spectrum slots. … We formulate the modulation-adaptive link-disjoint path selection problem as an integer linear programming (ILP). … We prove that the modulation-adaptive link-disjoint path selection problem is NP-complete. …

    IEEE Access (7), 25422-25437, 2019-02-22

    IR 

  • Topology Optimization of Structures with Frictionless Contact  [in Japanese]

    KANNO Yoshihiro

    … This paper presents a formulation that can be handled with a standard nonlinear programming approach. … The frictionless contact problem of an elastic body is formulated as a complementarity problem. …

    The Proceedings of Design & Systems Conference 2019.29(0), 2105, 2019

    J-STAGE 

  • A method of generating energy-efficient timetable for catenary free railways with battery trains  [in Japanese]

    SATO Takuya , MIYATAKE Masafumi

    … Although this optimization can be defined as a nonlinear programming problem, we ease to solve this problem using linear approximation to the energy consumption characteristic. …

    Transactions of the JSME (in Japanese) 85(880), 19-00092-19-00092, 2019

    J-STAGE 

  • MPC-Based Optimal Control for Diesel Engine Coupled with Lean NOx Trap System

    XU Fuguo , SHEN Tielong

    … <p>In this paper, an on-board optimal control problem for diesel engines with lean NOx trap (LNT) is investigated. … Then, the optimal control problem is formulated as a continuous receding horizon problem under dynamical model constraint and descretized into a nonlinear programming problem by using the multiple shooting method. …

    SICE Journal of Control, Measurement, and System Integration 12(3), 94-101, 2019

    J-STAGE 

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