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西澤　由輔 ニシザワ ユウスケ

■所属部署名 教育学部　自然科学講座 ■電話番号
■職名 准教授 ■FAX番号
■住所 埼玉県さいたま市桜区下大久保255 ■メールアドレス
■ホームページURL

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学歴

取得学位
博士（理学） , 首都大学東京

研究活動業績

研究業績(著書・発表論文等)

論文
Boundness of the power exponential function $a^{2b} +b^{2a}$
Aust. J. Math. Anal. Appl.,21:1-13 2024
Yusuke Nishizawa, Yukuhito Yasuda

Approximations by the fractional function of the sum of two functions converging to $e$
Appl.Math.E-Notes,24:19-26 2024
Misuzu Aoki, Yusuke Nishizawa, Rukiya Suzuki, Gohki Takamori

A simple proof of Ivady double inequality
J. Inequal. Spec. Funct.,14:16-20 2023
Naoki Kobayashi, Yusuke Nishizawa, Kenshiroh Okazaki

Sharp inequalities of Iyengar-Madhava Rao-Nanjundiah type including $\cos \left( {\frac{x}{\sqrt{3}}} +a x^r \right)$
J. Math. Inequal.,17:671-681 2023
Keisuke Murata, Ryota Nakagawa, Yusuke Nishizawa, Atsuya Sakamoto

The arithmetic-geometric mean inequality resulting from the function containing $e^x$ and $x^e$
J. Inequal. Spec. Funct.,14:1-6 2023
Yu Konaga, Yusuke Nishizawa, Ryuji Saito, Riki Sato

Some inequalities related to the power exponential function $a^{rb} +b^{ra}$
Appl. Math. E-Notes,23:237-242 2023
Mehdi Hassani, Yusuke Nishizawa

Sharped Jordan's type inequalities with exponential approximations
J. Math. Inequal.,17:1539-1550 2023
Nachi Kasuga, Mai Nakasuji, Yusuke Nishizawa, Takuma Sekine

Three inequalities associated with Rado inequality
Aust. J. Math. Anal. Appl.,19:1-8 2022
Rin Miyao, Yusuke Nishizawa, Keigo Takamura

Some inequalities for the hyperbolic tangent related $\sqrt{1-exp\left( -\frac{x^2}{\left(1 +x^2 \right)^p} \right)}$
J. Inequal. Spec. Funct.,13:1-9 2022
Fuuya Araki, Yuichiro Matsui, Yusuke Nishizawa, Hiroki Nakajima

Refinements of Arithmetic mean - Geometric mean inequality associated with the number e
J. Inequal. Spec. Funct.,12:23-35 2021
Mehdi Hassani, Valmir Krasniqi, Yusuke Nishizawa

Rational expressions of Arithmetic mean and Geometric mean for the sequence n^p
Aust. J. Math. Anal. Appl.,18:1-7 2021
Miu Kinegawa, Sayaka Miyamoto and Yusuke Nishizawa

The best possible constants of the inequalities with power exponential functions
Indian J. Pure Appl. Math.,51:1761-1768 2020
Yusuke Nishizawa

A lower bound of the power exponential function
J. Class. Anal.,15:1-8 2019
Yusuke Nishizawa

Extended a constant part of Redheffer’s type inequalities
Tamkang J. Math.,49:79-83 2018
Yusuke Nishizawa

数学科目におけるWebclassを用いたCBTの実施
宇部工業高等専門学校研究報告,64:19-25 2018
石田弘隆，西澤由輔

Refined quadratic estimations of Shafer’s inequality
J. Inequal. Appl.:1-11 2017
Yusuke Nishizawa

Sharp exponential approximate inequalities for trigonometric functions
Results Math.,71:609-621 2017
Yusuke Nishizawa

Symmetric inequalities with power-exponential functions
Indian J. Pure Appl. Math.,48:335-344 2017
Yusuke Nishizawa

Extended constant parts of Becker-Stark’s and Shafer-Fink’s inequalities
Tamkang J. Math.,47:385-391 2016
Yusuke Nishizawa

Double inequalities derived from the arithmetic-geometric-harmonic mean inequalities with power exponential functions
Research reports of National Institute of Technology, Ube College,62:9-16 2016
Yusuke Nishizawa

A stronger inequality of Cirtoaje’s one with power exponential functions
J. Nonlinear Sci. Appl.,8:224-230 2015
Mitsuhiro Miyagi, Yusuke Nishizawa

Sharpening of Jordan’s type and Shafer-Fink’s type inequalities with exponential approximations
Appl. Math. Comput.,269:146-154 2015
Yusuke Nishizawa

Extended constant parts of Wilker types and Cusa-Huygens types inequalities
Far East J. Math. Sci.,98:579-598 2015
Yusuke Nishizawa

Extension of an inequality with power exponential functions
Tamkang J. Math.,46:427-433 2015
Mitsuhiro Miyagi, Yusuke Nishizawa

Sharp Becker-Stark’s type inequalities with power exponential functions
J. Inequal. Appl.:1-11 2015
Yusuke Nishizawa

An elementary proof of some inequality derived from the function (b^x - a^x) / x
Research reports of National Institute of Technology, Ube College,61:41-44 2015
Yusuke Nishizawa, Mitsuhiro Miyagi

A short proof of an open inequality with power-exponential functions
Aust. J. Math.Anal. Appl.,11:1-3 2014
Mitsuhiro Miyagi, Yusuke Nishizawa

Proof of an open inequality with double power-exponential functions
J. Inequal. Appl.:1-11 2013
Mitsuhiro Miyagi, Yusuke Nishizawa

Simultaneous point bifurcations and bubbles for two parameter family of cubic polynomials
Far East J. Dynam. Syst.,15:67-82 2011
Eiichi Mitsukura, Yusuke Nishizawa

Heterodimensional tangencies leading to hyperbolic sets and wild hyperbolic strange attractors
数理解析研究所講究録,1768:38-54 2011
西澤由輔

一次元極限葉層構造をもつ3 次元C1 微分同相写像の力学系について
北海道大学数学考究録,148:35-42 2011
西澤由輔

オイラーの多面体定理に基づいた数学の教材開発につ いて－コンピュータ・情報機器を用いた授業を通して－
日本医療科学大学研究紀要,4:17-29 2011
三田満男，西澤由輔，佐藤宏平

Heterodimensional tangencies on cycles leading to strange attractors
Discrete Conti. Dynam. Sys.,27:285-300 2010
Shin Kiriki, Yusuke Nishizawa, Teruhiko Soma

Heterodimenional tangencies から導き出されるstrange attractors とC1- robust homoclinic tangencies について
数理解析研究所講究録,1688:164-174 2010
西澤由輔

Heterodimensional tangency and hyperbolic sets
北海道大学数学考究録,142:220-227 2010
西澤由輔

高校生に対する現代数学の導入の一例－カオス，フラクタルとはなにか？－
日本医療科学大学研究紀要,3:47-60 2010
三田満男，西澤由輔

Heterodimenional tangencies on cycle leading to strange attractors
北海道大学数学考究録,140:61-65 2009
Yusuke Nishizawa

Existence of horseshoe sets with nondegenerate one-sided homoclinic tangencies in R^3
Hokkaido Math. J.,37:133-145 2008
Yusuke Nishizawa