27 citations · 86 across the 13 of their papers we have counts for
13 papers
Random Walk Sampling in Social Networks Involving Private Nodes
Kazuki Nakajima, Kazuyuki Shudo
Analysis of social networks with limited data access is challenging for third parties. To address this challenge, a number of studies have developed algorithms that estimate proper…
Quantifying gender imbalance in East Asian academia: Research career and citation practice
Kazuki Nakajima, Ruodan Liu, Kazuyuki Shudo +1
Gender imbalance in academia has been confirmed in terms of a variety of indicators, and its magnitude often varies from country to country. Europe and North America, which cover a…
Higher-order rich-club phenomenon in collaborative research grants
Kazuki Nakajima, Kazuyuki Shudo, Naoki Masuda
Modern scientific work, including writing papers and submitting research grant proposals, increasingly involves researchers from different institutions. In grant collaborations, it…
Social Graph Restoration via Random Walk Sampling
Kazuki Nakajima, Kazuyuki Shudo
Analyzing social graphs with limited data access is challenging for third-party researchers. To address this challenge, a number of algorithms that estimate structural properties v…
Randomizing hypergraphs preserving degree correlation and local clustering
Kazuki Nakajima, Kazuyuki Shudo, Naoki Masuda
Many complex systems involve direct interactions among more than two entities and can be represented by hypergraphs, in which hyperedges encode higher-order interactions among an a…
Trail: A Blockchain Architecture for Light Nodes
Ryunosuke Nagayama, Ryohei Banno, Kazuyuki Shudo
In Bitcoin and Ethereum, nodes require large storage capacity to maintain all the blockchain data, such as transactions, UTXOs, and account states. As of May 2020, the storage size…
Estimating Properties of Social Networks via Random Walk considering Private Nodes
Kazuki Nakajima, Kazuyuki Shudo
Accurately analyzing graph properties of social networks is a challenging task because of access limitations to the graph data. To address this challenge, several algorithms to obt…
Identifying Impacts of Protocol and Internet Development on the Bitcoin Network
Ryunosuke Nagayama, Kazuyuki Shudo, Ryohei Banno
Improving transaction throughput is an important challenge for Bitcoin. However, shortening the block generation interval or increasing the block size to improve throughput makes i…
A Framework for Model Search Across Multiple Machine Learning Implementations
Yoshiki Takahashi, Masato Asahara, Kazuyuki Shudo
Several recently devised machine learning (ML) algorithms have shown improved accuracy for various predictive problems. Model searches, which explore to find an optimal ML algorith…
Proximity Neighbor Selection in Blockchain Networks
Yusuke Aoki, Kazuyuki Shudo
Blockchains have attracted a great deal of attention as a technology for the distributed management of register information at multiple nodes without a centralized system. However,…
SimBlock: A Blockchain Network Simulator
Yusuke Aoki, Kai Otsuki, Takeshi Kaneko +2
Blockchain, which is a technology for distributedly managing ledger information over multiple nodes without a centralized system, has elicited increasing attention. Performing expe…
Towards Application Portability on Blockchains
Kazuyuki Shudo, Reiki Kanda, Kenji Saito
We discuss the issue of what we call {\em incentive mismatch}, a fundamental problem with public blockchains supported by economic incentives. This is an open problem, but one pote…
Breakdown of a Benchmark Score Without Internal Analysis of Benchmarking Program
Naoki Matagawa, Kazuyuki Shudo
A breakdown of a benchmark score is how much each aspect of the system performance affects the score. Existing methods require internal analysis on the benchmarking program and the…