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Dr. Hisanori Yagami
Mie University, Regional Innovation Studies

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Short Biography

Associate Professor, Graduate School of Regional Innovations, Mie University

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Journal article
Published: 17 January 2021 in Sustainability
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Online education in China is developing at a rapid pace due to its unique advantages, and its sustainable development is becoming increasingly crucial. Thus, this study attempted to understand learners’ continuance intentions in an online learning environment and examined the factors influencing online learners’ continuous retention. The research model for the influencing factors and study hypotheses were constructed based on multiple theoretical and synthesized perspectives, such as the information system success model; interactions between students, content, and instructors; and the theory of perceived value. To achieve the stated objectives, we conducted a questionnaire survey, in which 382 valid responses were collected from Chinese respondents from 32 provinces in China in April and May 2020. Furthermore, this study primarily employed Structural Equation Modeling (SEM) and Partial Least Squares Structural Equation Modeling (PLS-SEM) to test the constructed model. The results indicate that service quality, course quality, and student–instructor interaction have indirect and positive effects on learners’ continuance intentions for online learning, while the variable of perceived value is a significant mediator for online learners’ retention and has a direct influence on their continuance intentions. Student–student interaction and student–content interaction do not have direct or indirect effects on online learners’ continuance intentions.

ACS Style

Yiwen Li; Norihiro Nishimura; Hisanori Yagami; Hye-Sook Park. An Empirical Study on Online Learners’ Continuance Intentions in China. Sustainability 2021, 13, 889 .

AMA Style

Yiwen Li, Norihiro Nishimura, Hisanori Yagami, Hye-Sook Park. An Empirical Study on Online Learners’ Continuance Intentions in China. Sustainability. 2021; 13 (2):889.

Chicago/Turabian Style

Yiwen Li; Norihiro Nishimura; Hisanori Yagami; Hye-Sook Park. 2021. "An Empirical Study on Online Learners’ Continuance Intentions in China." Sustainability 13, no. 2: 889.

Journal article
Published: 31 January 2011 in Advanced Powder Technology
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The objective of this study is to search for the possibility to transport or deliver small solid particles by a vortex ring. The numerical simulation for the motion of a vortex ring and glass particles is performed. At the launch of a vortex ring into quiescent air, spherical particles are arranged on the cross-section of the vortex ring. The cases of the Stokes number St of 0.01 and 1 are simulated by the vortex method. The simulation for St = 0.01 highlights that the vortex ring involves the particles at the launch and that it can transport the particles at a distance of 5.5 times longer than the initial diameter of the vortex ring. The simulation also clarifies the effect of St on the behavior of the vortex ring and the particle motion.

ACS Style

Hisanori Yagami; Tomomi Uchiyama. Numerical simulation for the transport of solid particles with a vortex ring. Advanced Powder Technology 2011, 22, 115 -123.

AMA Style

Hisanori Yagami, Tomomi Uchiyama. Numerical simulation for the transport of solid particles with a vortex ring. Advanced Powder Technology. 2011; 22 (1):115-123.

Chicago/Turabian Style

Hisanori Yagami; Tomomi Uchiyama. 2011. "Numerical simulation for the transport of solid particles with a vortex ring." Advanced Powder Technology 22, no. 1: 115-123.

Journal article
Published: 30 September 2009 in Advanced Powder Technology
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This study is concerned with the numerical simulation for the non-axisymmetric collision between a vortex ring and solid particles. The vortex ring convects with its self-induced velocity in a quiescent air, and the half part collides with spherical glass particles. The vortex method for gas-particle two-phase flow proposed by the authors in a prior paper is used for the simulation. The Reynolds number of the vortex ring is 2600, and the particle diameter is 50 μm. The Stokes number, defined as the ratio of the particle response time to the characteristic time of the vortex ring, is 0.74. The simulation clarifies that the particles induce the vortices, having an axis parallel to the convection direction of the vortex ring, inside the vortex ring and that pairs of the positive and negative vortex tubes appear. It also highlights that highly organized three-dimensional vortical structures composed of the streamwise vortices yield the rapid deformation and collapse of the vortex ring.

ACS Style

Tomomi Uchiyama; Hisanori Yagami. Vortex simulation for non-axisymmetric collision of a vortex ring with solid particles. Advanced Powder Technology 2009, 20, 447 -454.

AMA Style

Tomomi Uchiyama, Hisanori Yagami. Vortex simulation for non-axisymmetric collision of a vortex ring with solid particles. Advanced Powder Technology. 2009; 20 (5):447-454.

Chicago/Turabian Style

Tomomi Uchiyama; Hisanori Yagami. 2009. "Vortex simulation for non-axisymmetric collision of a vortex ring with solid particles." Advanced Powder Technology 20, no. 5: 447-454.

Journal article
Published: 02 December 2008 in Powder Technology
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This study is concerned with the numerical simulation for the collision between a vortex ring and an ensemble of small glass particles. The vortex ring, convecting with its self-induced velocity in a quiescent air, collides with the particles. The Reynolds number for the vortex ring is 2600, and the particle diameters are 50 and 200 μm. The Stokes number St for the 50 μm particle is 0.74, while the St for the 200 μm particle is 11.4. Immediately after the collision with the vortex ring, the 50 μm particles surround the vortex ring, forming a dome. It is parallel with the preferential distribution for the particle with St ≃ 1 around large-scale eddies, which has been measured experimentally and simulated numerically in various free turbulent flows. The 200 μm particles disperse more due to the collision with the vortex ring. This is attributable to the centrifugal effect of large-scale eddy, which has been reported by the numerical simulation for the motion of the particle with St = 10 in a wake flow. The collision between the vortex ring and the particles induces an organized three-dimensional vortical structure. It also reduces the strength and convective velocity of the vortex ring.

ACS Style

Tomomi Uchiyama; Hisanori Yagami. Numerical simulation for the collision between a vortex ring and solid particles. Powder Technology 2008, 188, 73 -80.

AMA Style

Tomomi Uchiyama, Hisanori Yagami. Numerical simulation for the collision between a vortex ring and solid particles. Powder Technology. 2008; 188 (1):73-80.

Chicago/Turabian Style

Tomomi Uchiyama; Hisanori Yagami. 2008. "Numerical simulation for the collision between a vortex ring and solid particles." Powder Technology 188, no. 1: 73-80.

Original articles
Published: 01 January 2008 in International Journal of Modelling and Simulation
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This paper is concerned with the numerical simulation for a point-source plume diffusion field of matter upstream of, around and behind a circular cylinder in turbulent flow. The simulation employs the particle method, in which the velocity field is calculated by a vortex method and the concentration field is computed by a method analogous to the vortex method. The diffusing matter is entrained into the Karman vortices and exhibits meandering behaviour in accordance with the experiment. The mean and fluctuation concentrations are in good agreement with the measurement, demonstrating that the particle method has a high applicability to the analysis of diffusion of matter around an obstacle in free turbulent flow.

ACS Style

T. Uchiyama; H. Yagami; M. Sugiyama. Particle Simulation of the Plume Diffusion Field Around a Circular Cylinder. International Journal of Modelling and Simulation 2008, 28, 323 -328.

AMA Style

T. Uchiyama, H. Yagami, M. Sugiyama. Particle Simulation of the Plume Diffusion Field Around a Circular Cylinder. International Journal of Modelling and Simulation. 2008; 28 (3):323-328.

Chicago/Turabian Style

T. Uchiyama; H. Yagami; M. Sugiyama. 2008. "Particle Simulation of the Plume Diffusion Field Around a Circular Cylinder." International Journal of Modelling and Simulation 28, no. 3: 323-328.

Journal article
Published: 01 January 2007 in International Journal of Turbo & Jet-Engines
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ACS Style

Hisanori Yagami; Tomomi Uchiyama. Numerical Simulation of Plane Mixing Layer by Three-Dimensional Vortex Method. International Journal of Turbo & Jet-Engines 2007, 24, 93 -102.

AMA Style

Hisanori Yagami, Tomomi Uchiyama. Numerical Simulation of Plane Mixing Layer by Three-Dimensional Vortex Method. International Journal of Turbo & Jet-Engines. 2007; 24 (2):93-102.

Chicago/Turabian Style

Hisanori Yagami; Tomomi Uchiyama. 2007. "Numerical Simulation of Plane Mixing Layer by Three-Dimensional Vortex Method." International Journal of Turbo & Jet-Engines 24, no. 2: 93-102.

Conference paper
Published: 01 January 2007 in The Proceedings of The Computational Mechanics Conference
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ACS Style

Hisanori Yagami; Tomomi Uchiyama. 2507 Numerical Simulation for the Transport of Solid Particles by a Vortex Method. The Proceedings of The Computational Mechanics Conference 2007, 2007.20, 91 -92.

AMA Style

Hisanori Yagami, Tomomi Uchiyama. 2507 Numerical Simulation for the Transport of Solid Particles by a Vortex Method. The Proceedings of The Computational Mechanics Conference. 2007; 2007.20 ():91-92.

Chicago/Turabian Style

Hisanori Yagami; Tomomi Uchiyama. 2007. "2507 Numerical Simulation for the Transport of Solid Particles by a Vortex Method." The Proceedings of The Computational Mechanics Conference 2007.20, no. : 91-92.

Conference paper
Published: 01 January 2007 in Volume 2: Fora, Parts A and B
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This study is concerned with the numerical simulation of the collision between a vortex ring and an ensemble of small glass particles. The vortex ring, convecting with the self-induced velocity in a quiescent air, collides with the particles. The Reynolds number for the vortex ring is 2600, and the particle diameters are 50 and 200μm. Immediately after the collision with the vortex ring, the 50μm particles surround the vortex ring, forming a dome. The 200μm particles disperse more due to the collision with the vortex ring. This is attributable to the centrifugal effect of the large-scale eddy. The collision between the vortex ring and the particles induces an organized three-dimensional vortical structure inside the vortex ring. It also reduces the strength of vortex ring and the convective velocity.

ACS Style

Hisanori Yagami; Tomomi Uchiyama. Numerical Simulation for the Collision of a Vortex Ring With Solid Particles. Volume 2: Fora, Parts A and B 2007, 833 -840.

AMA Style

Hisanori Yagami, Tomomi Uchiyama. Numerical Simulation for the Collision of a Vortex Ring With Solid Particles. Volume 2: Fora, Parts A and B. 2007; ():833-840.

Chicago/Turabian Style

Hisanori Yagami; Tomomi Uchiyama. 2007. "Numerical Simulation for the Collision of a Vortex Ring With Solid Particles." Volume 2: Fora, Parts A and B , no. : 833-840.

Conference paper
Published: 01 January 2005 in The Proceedings of the Fluids engineering conference
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ACS Style

Hisanori Yagami; Tomomi Uchiyama. 502 Vortex simulation for gas-particle two-phase plane mixing layer. The Proceedings of the Fluids engineering conference 2005, 2005, 62 .

AMA Style

Hisanori Yagami, Tomomi Uchiyama. 502 Vortex simulation for gas-particle two-phase plane mixing layer. The Proceedings of the Fluids engineering conference. 2005; 2005 ():62.

Chicago/Turabian Style

Hisanori Yagami; Tomomi Uchiyama. 2005. "502 Vortex simulation for gas-particle two-phase plane mixing layer." The Proceedings of the Fluids engineering conference 2005, no. : 62.

Book chapter
Published: 15 December 2004 in Environmental Hydraulics and Sustainable Water Management, Two Volume Set
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ACS Style

Hisanori Yagami; Tomomi Uchiyama. Numerical simulation of particle-laden gas wake flow by vortex method. Environmental Hydraulics and Sustainable Water Management, Two Volume Set 2004, 525 -531.

AMA Style

Hisanori Yagami, Tomomi Uchiyama. Numerical simulation of particle-laden gas wake flow by vortex method. Environmental Hydraulics and Sustainable Water Management, Two Volume Set. 2004; ():525-531.

Chicago/Turabian Style

Hisanori Yagami; Tomomi Uchiyama. 2004. "Numerical simulation of particle-laden gas wake flow by vortex method." Environmental Hydraulics and Sustainable Water Management, Two Volume Set , no. : 525-531.

Conference paper
Published: 01 January 2003 in The Proceedings of the Fluids engineering conference
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ACS Style

Tomomi Uchiyama; Hisanori Yagami. Numerical Simulation of Wake Gas Flow Laden with Solid Particles. The Proceedings of the Fluids engineering conference 2003, 2003, 26 .

AMA Style

Tomomi Uchiyama, Hisanori Yagami. Numerical Simulation of Wake Gas Flow Laden with Solid Particles. The Proceedings of the Fluids engineering conference. 2003; 2003 ():26.

Chicago/Turabian Style

Tomomi Uchiyama; Hisanori Yagami. 2003. "Numerical Simulation of Wake Gas Flow Laden with Solid Particles." The Proceedings of the Fluids engineering conference 2003, no. : 26.