Search Results for author: Keigo Yamada

Found 10 papers, 2 papers with code

Fast Data-driven Greedy Sensor Selection for Ridge Regression

no code implementations16 Feb 2024 Yasuo Sasaki, Keigo Yamada, Takayuki Nagata, Yuji Saito, Taku Nonomura

Sensor selection which prevents the overfitting of the resulting estimator can be realized by setting a positive regularization parameter.

Dimensionality Reduction regression

Proof-of-concept Study of Sparse Processing Particle Image Velocimetry for Real Time Flow Observation

no code implementations14 Jul 2022 Naoki Kanda, Chihaya Abe, Shintaro Goto, Keigo Yamada, Kumi Nakai, Yuji Saito, Keisuke Asai, Taku Nonomura

In the wind tunnel test, the PIV measurement and real-time measurement using SPPIV were conducted for the flow velocity field around the NACA0015 airfoil model.

Observation Site Selection for Physical Model Parameter Estimation toward Process-Driven Seismic Wavefield Reconstruction

no code implementations9 Jun 2022 Kumi Nakai, Takayuki Nagata, Keigo Yamada, Yuji Saito, Taku Nonomura, Masayuki Kano, Shin-ichi Ito, Hiromichi Nagao

The seismic wavefield is reconstructed by the numerical simulation using the parameters estimated based on the observed signals at only observation sites selected by the proposed method.

Data-Driven Sensor Selection Method Based on Proximal Optimization for High-Dimensional Data With Correlated Measurement Noise

no code implementations12 May 2022 Takayuki Nagata, Keigo Yamada, Taku Nonomura, Kumi Nakai, Yuji Saito, Shunsuke Ono

The proposed method can avoid the difficulty of sensor selection with strongly correlated measurement noise, in which the possible sensor locations must be known in advance for calculating the precision matrix for selecting sensor locations.

Randomized Group-Greedy Method for Large-Scale Sensor Selection Problems

no code implementations9 May 2022 Takayuki Nagata, Keigo Yamada, Kumi Nakai, Yuji Saito, Taku Nonomura

In the customized method, a part of the compressed sensor candidates is selected using the common greedy method or other low-cost methods.

Nondominated-Solution-based Multi-objective Greedy Sensor Selection for Optimal Design of Experiments

no code implementations27 Apr 2022 Kumi Nakai, Yasuo Sasaki, Takayuki Nagata, Keigo Yamada, Yuji Saito, Taku Nonomura

Specifically, a new index is iteratively added to the nondominated solutions of sets, and the multi-objective functions are evaluated for new sets.

Multiobjective Optimization

Greedy Sensor Selection for Weighted Linear Least Squares Estimation under Correlated Noise

no code implementations27 Apr 2021 Keigo Yamada, Yuji Saito, Taku Nonomura, Keisuke Asai

A noise model is given using truncated modes in reduced-order modeling, and sensor positions that are optimal for generalized least squares estimation are selected.

Effect of Objective Function on Data-Driven Greedy Sparse Sensor Optimization

1 code implementation10 Jul 2020 Kumi Nakai, Keigo Yamada, Takayuki Nagata, Yuji Saito, Taku Nonomura

The objective functions based on various criteria of optimal design are adopted to the greedy method: D-optimality, A-optimality, and E-optimality, which maximizes the determinant, minimize the trace of inverse, and maximize the minimum eigenvalue of the Fisher information matrix, respectively.

Determinant-based Fast Greedy Sensor Selection Algorithm

2 code implementations20 Nov 2019 Yuji Saito, Taku Nonomura, Keigo Yamada, Kumi Nakai, Takayuki Nagata, Keisuke Asai, Yasuo Sasaki, Daisuke Tsubakino

The maximization of the determinant of the matrix which appears in pseudo-inverse matrix operations is employed as an objective function of the problem in the present extended approach.

Data-driven Vector-measurement-sensor Selection based on Greedy Algorithm

no code implementations30 May 2019 Yuji Saito, Taku Nonomura, Koki Nankai, Keigo Yamada, Keisuke Asai, Yasuo Sasaki, Daisuke Tsubakino

A vector-measurement-sensor problem for the least squares estimation is considered, by extending a previous novel approach in this paper.

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