Search Results for author: Shizuo Kaji

Found 15 papers, 10 papers with code

Training of deep cross-modality conversion models with a small dataset, and their application in megavoltage CT to kilovoltage CT conversion

no code implementations12 Jul 2021 Sho Ozaki, Shizuo Kaji, Kanabu Nawa, Toshikazu Imae, Atsushi Aoki, Takahiro Nakamoto, Takeshi Ohta, Yuki Nozawa, Hideomi Yamashita, Akihiro Haga, Keiichi Nakagawa

The proposed method is based on CycleGAN with several extensions tailored for CT images, which aims at preserving the structure in the processed images and reducing the amount of training data.

Computed Tomography (CT)

Nested Subspace Arrangement for Representation of Relational Data

1 code implementation ICML 2020 Nozomi Hata, Shizuo Kaji, Akihiro Yoshida, Katsuki Fujisawa

Studies on acquiring appropriate continuous representations of discrete objects, such as graphs and knowledge base data, have been conducted by many researchers in the field of machine learning.

Representation Learning

Cubical Ripser: Software for computing persistent homology of image and volume data

2 code implementations23 May 2020 Shizuo Kaji, Takeki Sudo, Kazushi Ahara

We introduce Cubical Ripser for computing persistent homology of image and volume data (more precisely, weighted cubical complexes).

A closed linkage mechanism having the shape of a discrete Möbius strip

1 code implementation5 Sep 2019 Shizuo Kaji

A closed linkage mechanism in three-dimensional space is an object comprising rigid bodies connected with hinges in a circular form like a rosary.

History and Overview Differential Geometry 14M06, 53A04

Overview of image-to-image translation using deep neural networks: denoising, super-resolution, modality-conversion, and reconstruction in medical imaging

2 code implementations21 May 2019 Shizuo Kaji, Satoshi Kida

We hope this article together with the codes will provide both an overview and the details of the key algorithms and will serve as a basis for developing new applications.

Medical Physics Image and Video Processing

Linkage Mechanisms Governed by Integrable Deformations of Discrete Space Curves

1 code implementation15 Mar 2019 Shizuo Kaji, Kenji Kajiwara, Hyeongki Park

A linkage mechanism consists of rigid bodies assembled by joints which can be used to translate and transfer motion from one form in one place to another.

Exactly Solvable and Integrable Systems

Suspension splittings and self-maps of flag manifolds

no code implementations6 Feb 2018 Shizuo Kaji, Stephen Theriault

If $G$ is a compact connected Lie group and $T$ is a maximal torus, we give a wedge decomposition of $\Sigma G/T$ by identifying families of idempotents in cohomology.

Algebraic Topology 55P40, 55S37 (Primary) 57T15 (Secondary)

Geometric representations of finite groups on real toric spaces

no code implementations27 Apr 2017 Soojin Cho, Suyoung Choi, Shizuo Kaji

We give a combinatorial description of the $G$-module structure of the homology of $X^{\mathbb R}$.

Algebraic Topology Representation Theory 55U10, 14M25, 20C30, 20F55, 06A11

Polynomial expressions of $p$-ary auction functions

no code implementations23 Mar 2017 Shizuo Kaji, Toshiaki Maeno, Koji Nuida, Yasuhide Numata

Let $\mathbb{F}_p$ be the finite field of prime order $p$.

Combinatorics 68R05, 12Y05

A linear algorithm for Brick Wang tiling

1 code implementation14 Mar 2016 Alexandre Derouet-Jourdan, Shizuo Kaji, Yoshihiro Mizoguchi

We generalise their result by providing a linear algorithm to decide and solve the tiling problem for arbitrary planar regions with holes.

Discrete Mathematics Graphics 05B45, 52C20, 68R10 I.3.3; I.3.6

Tetrisation of triangular meshes and its application in shape blending

1 code implementation19 Jan 2016 Shizuo Kaji

The As-Rigid-As-Possible (ARAP) shape deformation framework is a versatile technique for morphing, surface modelling, and mesh editing.

Graphics Computational Geometry I.3.5; I.3.7

Anti-commutative Dual Complex Numbers and 2D Rigid Transformation

2 code implementations8 Jan 2016 Genki Matsuda, Shizuo Kaji, Hiroyuki Ochiai

We introduce a new presentation of the two dimensional rigid transformation which is more concise and efficient than the standard matrix presentation.

Graphics Computational Geometry I.3.5; I.3.3

A concise parametrisation of affine transformation

2 code implementations19 Jul 2015 Shizuo Kaji, Hiroyuki Ochiai

Good parametrisations of affine transformations are essential to interpolation, deformation, and analysis of shape, motion, and animation.

Graphics 68U05, 65D18, 65F60, 15A16 I.3.5; I.3.7

Polynomial Expressions of Carries in p-ary Arithmetics

no code implementations9 Jun 2015 Shizuo Kaji, Toshiaki Maeno, Koji Nuida, Yasuhide Numata

It is known that any $n$-variable function on a finite prime field of characteristic $p$ can be expressed as a polynomial over the same field with at most $p^n$ monomials.

Combinatorics Cryptography and Security Information Theory Information Theory Number Theory 11T06 (primary), 05E05, 68R05, 94A60

Three presentations of torus equivariant cohomology of flag manifolds

1 code implementation5 Apr 2015 Shizuo Kaji

One of the main goals of the {\em equivariant Schubert calculus} is to study the $T$-equivariant cohomology $H^*_T(G/T)$ with regard to the $T$-action on $G/T$ by multiplication.

Algebraic Topology 57T15, 14M15

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