Search Results for author: Naoki Masuda

Found 12 papers, 8 papers with code

State-transition dynamics of resting-state functional magnetic resonance imaging data: Model comparison and test-to-retest analysis

1 code implementation23 Aug 2023 Saiful Islam, Pitambar Khanra, Johan Nakuci, Sarah F. Muldoon, Takamitsu Watanabe, Naoki Masuda

Electroencephalogram (EEG) microstate analysis entails finding dynamics of quasi-stable and generally recurrent discrete states in multichannel EEG time series data and relating properties of the estimated state-transition dynamics to observables such as cognition and behavior.

Clustering EEG +1

Reliability of energy landscape analysis of resting-state functional MRI data

1 code implementation31 May 2023 Pitambar Khanra, Johan Nakuci, Sarah Muldoon, Takamitsu Watanabe, Naoki Masuda

Energy landscape analysis is a data-driven method to analyze multidimensional time series, including functional magnetic resonance imaging (fMRI) data.

Time Series

Gene communities in co-expression networks across different tissues

no code implementations22 May 2023 Madison Russell, Alber Aqil, Marie Saitou, Omer Gokcumen, Naoki Masuda

We suggest that KRTAP3-1, KRTAP3-3, and KRTAP3-5 share regulatory elements in skin and pancreas.

Community Detection

Temporal Motifs for Financial Networks: A Study on Mercari, JPMC, and Venmo Platforms

no code implementations18 Jan 2023 Penghang Liu, Rupam Acharyya, Robert E. Tillman, Shunya Kimura, Naoki Masuda, Ahmet Erdem Sarıyüce

For the Venmo network, we investigate the interplay between financial and social relations on three tasks: friendship prediction, vendor identification, and analysis of temporal cycles.

Fraud Detection

Biases in Inverse Ising Estimates of Near-Critical Behaviour

1 code implementation13 Jan 2023 Maximilian Benedikt Kloucek, Thomas Machon, Shogo Kajimura, C. Patrick Royall, Naoki Masuda, Francesco Turci

Inverse Ising inference allows pairwise interactions of complex binary systems to be reconstructed from empirical correlations.

Concurrency measures in the era of temporal network epidemiology: A review

no code implementations24 Dec 2020 Naoki Masuda, Joel C. Miller, Petter Holme

Diseases spread over temporal networks of interaction events between individuals.

Epidemiology Physics and Society Social and Information Networks

Modeling state-transition dynamics in resting-state brain signals by the hidden Markov and Gaussian mixture models

1 code implementation23 Jan 2020 Takahiro Ezaki, Yu Himeno, Takamitsu Watanabe, Naoki Masuda

However, we also find that the accuracy of the GMM is comparable to that of the HMM under the condition that the sampling frequency is reasonably low (e. g., TR = 2. 88 or 3. 60 s) or the data is relatively short.

Time Series Time Series Analysis

Estimating international trade status of countries from global liner shipping networks

1 code implementation21 Jan 2020 Mengqiao Xu, Qian Pan, Haoxiang Xia, Naoki Masuda

Maritime shipping is a backbone of international trade and thus the world economy.

Social and Information Networks

Constructing networks by filtering correlation matrices: A null model approach

1 code implementation26 Mar 2019 Sadamori Kojaku, Naoki Masuda

Thresholding on the value of the pairwise correlation is probably the most straightforward and common method to create a network from a correlation matrix.

Physics and Society

Multiscale core-periphery structure in a global liner shipping network

1 code implementation14 Aug 2018 Sadamori Kojaku, Mengqiao Xu, Haoxiang Xia, Naoki Masuda

We develop an algorithm to detect core-periphery pairs in a network, which allows one to find core and peripheral nodes on different scales and uses a configuration model that accounts for the fact that the network is obtained by the one-mode projection of a bipartite network.

Physics and Society

Solving Feature Sparseness in Text Classification using Core-Periphery Decomposition

no code implementations SEMEVAL 2018 Xia Cui, Sadamori Kojaku, Naoki Masuda, Danushka Bollegala

We observe that prioritising features that are common to both training and test instances as cores during the CP decomposition to further improve the accuracy of text classification.

Domain Adaptation General Classification +4

Finding multiple core-periphery pairs in networks

2 code implementations22 Feb 2017 Sadamori Kojaku, Naoki Masuda

We propose a scalable algorithm to detect multiple non-overlapping groups of core-periphery structure in a network.

Physics and Society Social and Information Networks

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