255 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- The University of TokyoJP7 papers
- University of Electro-CommunicationsJP6 papers
- Tokyo Institute of TechnologyJP4 papers
- Hirosaki UniversityJP3 papers
- Irkutsk State UniversityRU3 papers
- Institute for Future EngineeringJP2 papers
- Shiraz UniversityIR2 papers
- The Institute of Statistical MathematicsJP2 papers
- Embassy of Canada in Washington, D.CUS1 paper
- Hitachi (Japan)JP1 paper
- Institute for Nuclear ResearchRU1 paper
- Istituto Nazionale di Fisica Nucleare, Sezione di FirenzeIT1 paper
23 papers
Fractional stochastic model of citation dynamics with memory and volatility
Keisuke Okamura
Understanding the statistical laws governing citation dynamics remains a fundamental challenge in network theory and the science of science. Citation networks typically exhibit in-…
Evolving interdisciplinary contributions to global societal challenges: A 50-year overview
Keisuke Okamura
Addressing global societal challenges necessitates insights and expertise that transcend the boundaries of individual disciplines. In recent decades, interdisciplinary collaboratio…
Evolving landscape of US-China science collaboration: Convergence and divergence
Kensei Kitajima, Keisuke Okamura
International research collaboration among global scientific powerhouses has exhibited a discernible trend towards convergence in recent decades. Notably, the US and China have sig…
Atlas of Science Collaboration, 1971-2020
Keisuke Okamura
The evolving landscape of interinstitutional collaborative research across 15 natural science disciplines is explored using the open data sourced from OpenAlex. This extensive expl…
A half-century of global collaboration in science and the 'Shrinking World'
Keisuke Okamura
Recent decades have witnessed a dramatic shift in the cross-border collaboration mode of researchers, with countries increasingly cooperating and competing with one another. It is…
Scientometric engineering: Exploring citation dynamics via arXiv eprints
Keisuke Okamura
Scholarly communications have been rapidly integrated into digitised and networked open ecosystems, where preprint servers have played a pivotal role in accelerating the knowledge…
An oracle-based projection and rescaling algorithm for linear semi-infinite feasibility problems and its application to SDP and SOCP
Masakazu Muramatsu, Tomonari Kitahara, Bruno F. Lourenço +2
We point out that Chubanov's oracle-based algorithm for linear programming [5] can be applied almost as it is to linear semi-infinite programming (LSIP). In this note, we describe…
An extension of Chubanov's algorithm to symmetric cones
Bruno F. Lourenço, Tomonari Kitahara, Masakazu Muramatsu +1
In this work we present an extension of Chubanov's algorithm to the case of homogeneous feasibility problems over a symmetric cone K. As in Chubanov's method for linear feasibility…
An Extension of Chubanov's Polynomial-Time Linear Programming Algorithm to Second-Order Cone Programming
Tomonari Kitahara, Takashi Tsuchiya
Recently, Chubanov proposed an interesting new polynomial-time algorithm for linear program. In this paper, we extend his algorithm to second-order cone programming.
Implementation of Interior-point Methods for LP based on Krylov Subspace Iterative Solvers with Inner-iteration Preconditioning
Yiran Cui, Keiichi Morikuni, Takashi Tsuchiya +1
We apply novel inner-iteration preconditioned Krylov subspace methods to the interior-point algorithm for linear programming (LP). Inner-iteration preconditioners recently proposed…
The strict complementary slackness condition in linear fractional programming
Mahmood Mehdiloozad, Kaoru Tone, Mohammad Bagher Ahmadi
The strict complementary slackness condition (SCSC) is an important concept in the duality theory of linear programming (LP). The current study aims at extending this concept to th…
Facial Reduction and Partial Polyhedrality
Bruno F. Lourenço, Masakazu Muramatsu, Takashi Tsuchiya
We present FRA-Poly, a facial reduction algorithm (FRA) for conic linear programs that is sensitive to the presence of polyhedral faces in the cone. The main goals of FRA and FRA-P…
Weak Infeasibility in Second Order Cone Programming
Bruno F. Lourenço, Masakazu Muramatsu, Takashi Tsuchiya
The objective of this work is to study weak infeasibility in second order cone programming. For this purpose, we consider a relaxation sequence of feasibility problems that mostly…
Optimal Bandwidth Selection for the Fuzzy Regression Discontinuity Estimator
Yoichi Arai, Hidehiko Ichimura
A new bandwidth selection method for the fuzzy regression discontinuity estimator is proposed. The method chooses two bandwidths simultaneously, one for each side of the cut-off po…
A structural geometrical analysis of weakly infeasible SDPs
Bruno F. Lourenço, Masakazu Muramatsu, Takashi Tsuchiya
In this article, we present a geometric theoretical analysis of semidefinite feasibility problems (SDFPs). This is done by decomposing a SDFP into smaller problems, in a way that p…
Measurement of returns to scale with weight restrictions: How to deal with the occurrence of multiple supporting hyperplanes?
Mahmood Mehdiloozad, Kaoru Tone, Biresh K. Sahoo
While measuring returns to scale in data envelopment analysis (DEA), the occurrence of multiple supporting hyperplanes has been perceived as a crucial issue. To deal effectively wi…
Solving SDP Completely with an Interior Point Oracle
Bruno F. Lourenço, Masakazu Muramatsu, Takashi Tsuchiya
We suppose the existence of an oracle which solves any semidefinite programming (SDP) problem satisfying Slater's condition simultaneously at its primal and dual sides. We note tha…
Simultaneous Selection of Optimal Bandwidths for the Sharp Regression Discontinuity Estimator
Yoichi Arai, Hidehiko Ichimura
A new bandwidth selection rule that uses different bandwidths for the local linear regression estimators on the left and the right of the cut-off point is proposed for the sharp re…
Logistic Growth for the Nuzi Cuneiform Tablets: Analyzing Family Networks in Ancient Mesopotamia
Sumie Ueda, Kumi Makino, Yoshiaki Itoh +1
We reconstruct the year of publication of each cuneiform tablet of the Nuzi society in ancient Mesopotamia. The tablets, are on land transaction, marriage, loan, slavery contracts…
A Microscopic Mechanism for Muscle's Motion
Bao-Quan Ai, Xian-Ju Wang, Guo-Tao Liu +3
The SIRM (Stochastic Inclined Rods Model) proposed by H. Matsuura and M. Nakano can explain the muscle's motion perfectly, but the intermolecular potential between myosin head and…
Muon's Behaviors under Bremsstrahlung with both the LPM effect and the Ter-Mikaelian effect and Direct Pair Production with the LPM effect
S. Polityko, N. Takahashi, M. Kato +2
Differential and integral cross sections of the muon are calculated in the materials: water, standard rock, iron and lead with and without the LPM effect. The corresponding cross s…
Expected Muon Energy Spectra and Zenithal Distributions Deep Underwater
A. Misaki, V. A. Naumov, T. S. Sinegovskaya +2
Energy spectra and zenith angle distributions of atmospheric muons are calculated for the depths of operation of large underwater neutrino telescopes. The estimation of the prompt…
Atmospheric Muon Flux at Sea Level, Underground, and Underwater
E. V. Bugaev, A. Misaki, V. A. Naumov +3
The vertical sea-level muon spectrum at energies above 1 GeV and the underground/underwater muon intensities at depths up to 18 km w.e. are calculated. The results are particularly…