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Other departments in Faculty of Engineering Science ›Faculties at Yokohama National University ›
Taichi Murayama, Assistant Professor
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The Murayama Lab centers on web informatics and computational social science, and studies social problems using data from the web. Working with web data that reflects the information of contemporary society, the lab clarifies the causes of various problems latent in society and develops methods that contribute to solving them. Its topics include online misinformation and conspiracy theories, the analysis of social media posts, and the prediction of data that change over time. The lab was established in April 2024 as a lab affiliated with the Department of Information Environment, Graduate School of Environment and Information Sciences, and the Computer Science EP of the Department of Mathematics, Physics, Electrical Engineering and Computer Science, Faculty of Engineering Science.
Seiichiro Ueki, Professor
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Professor Seiichiro Ueki studies vector spaces formed by analytic (holomorphic) functions on complex domains, and the linear operators defined on those spaces. By classifying analytic functions under various conditions, the lab considers function spaces with different topological properties. The properties of each function space are investigated using function theory, functional analysis, Fourier analysis, and related fields. In the Mathematical Sciences Educational Program (EP) of the Department of Mathematics, Physics, Electronics and Information Systems, the professor teaches Functional Analysis and Introduction to Mathematical Sciences.
Erika Ushikoshi, Associate Professor
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Associate Professor Erika Ushikoshi specializes in the theory of partial differential equations, within the field of analysis. Partial differential equations describe natural phenomena mathematically on the basis of physical laws, and the lab aims to understand the essence of these phenomena more deeply through their analysis. In particular, the lab mathematically examines how the solutions and eigenvalues of equations are affected when a small perturbation is applied to the domain. The equations studied are the Navier–Stokes equations, the Stokes equations (their linearization), and the Lamé equations, which describe the vibration of elastic bodies.
Katsunori Okajima, Professor
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The Okajima Lab (Visual Cognition Mechanisms) studies how the brain processes information from the five senses, with a focus on vision. Using psychophysics, a method that presents stimuli to people and measures their psychological responses, the lab investigates the mechanisms of perception and summarizes them in models. These findings are applied to the development of virtual reality (VR), augmented reality (AR), information display systems, and more. The lab also carries out joint research with companies, universities, and research institutes.
Kenta Ozeki, Professor
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Professor Kenta Ozeki's lab studies graph theory, which investigates the structures and properties of graphs that model connections between objects. Road networks and social media networks can be viewed as graphs. The lab is particularly interested in good paths in graphs, and lists cycles, paths, and graph coloring as its research areas. Hamiltonicity of graphs on closed surfaces is another of its research areas.
Takeshi Kajiwara, Professor
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Professor Takeshi Kajiwara's lab studies number theory, arithmetic geometry, and algebraic geometry within the field of algebra. The starting point is the familiar integers, from which many different worlds unfold. The lab learns the results of its predecessors one by one while aiming for further progress. In undergraduate courses, the professor teaches "Sets and Topology" and "Galois Theory and Number Theory."
Minoru Shirazaki, Associate Professor
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Associate Professor Minoru Shirazaki studies computational fluid dynamics, a branch of fluid dynamics, which investigates the motion of fluids, such as air and water, that change shape easily, and the forces acting on them. The equations of motion for fluids (the Navier-Stokes equations) are not easy to solve, so the lab works to clarify fluid phenomena through computer simulation. Recently, the lab has focused on multiphase flows, in which gases, liquids, and solids interact with one another. It also conducts research that uses numerical simulation to study how living organisms run on or swim through water.
Etsuo Segawa, Professor
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Professor Etsuo Segawa's research fields are quantum walks and discrete mathematical models. The university's researcher directory lists papers on quantum walks on graphs and on models that bridge random walks and quantum walks. The professor has also contributed chapters to a specialist book on quantum walks. He belongs to the Division of Social Environment and Information in the Faculty of Environment and Information Sciences, and also holds a concurrent appointment in the Department of Mathematics, Physics, Electrical Engineering and Computer Science in the Faculty of Engineering Science.
Masato Takei, Professor
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Professor Masato Takei's probability theory lab uses the mathematics of probability theory to study the laws followed by things that seem, at first glance, to move at random. His fields of specialization are given as random walks and percolation in the faculty profile, and as lattice probability models and stochastic processes in the graduate school's faculty list. In recent years, he has been pursuing research out of interest in the behavior of random walks in which past history affects future movement.
Tomoyuki Tanaka, Associate Professor
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Associate Professor Tomoyuki Tanaka, who works on the theory of partial differential equations, studies nonlinear partial differential equations of the so-called dispersive type, which are related to wave phenomena. Examples include the KdV equation, a model of waves on shallow water such as canals, and the Schrödinger equation, the fundamental equation of quantum mechanics. For nonlinear problems, a "solution formula" cannot be expected, so it is not even obvious whether an equation has a solution in the first place. The professor is also interested in how solutions behave.
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