## Research:
**Journal**__Ryoichi Mizuno__, Yoshinori Dobashi, and Tomoyuki Nishita,
**Modeling of Volcanic Clouds using CML**,
*Journal of Information Science and Engineering (JISE)*,**20**(2): 219-232, 2004. ISSN: 1016-2364 —— Abstract: In this paper, the model of volcanic clouds for computer graphics using the Coupled Map Lattice (CML) method is proposed. In this model, the Navier-Stokes equations are used, and the equations are solved by using the CML method that can be applied as an efficient fluid solver. Moreover, to generate desired shape of volcanic clouds, some parameters that allow intuitively control of the shape are provided. Hence, in this system, the behavior of the volcanic clouds can be calculated in practical calculation time, and by only changing some parameters various shapes of the volcanic clouds can be generated. Therefore, photo-realistic images/animations of various shapes of volcanic clouds can be created efficiently by the proposed approach. | PDF |
**International Conference**__Ryoichi Mizuno__, Yoshinori Dobashi, Bing-Yu Chen, and Tomoyuki Nishita,
**Physics Motivated Modeling of Volcanic Clouds as a Two Fluids Model**,
*Proc. 11th Pacific Conference on Computer Graphics and Applications (PG 2003)*, 434-439, Canmore (Canada), October 2003. [IEEE Computer Society] doi: 10.1109/PCCGA.2003.1238291 ISBN: 0-7695-2028-6 —— Abstract: In this paper, we present a physics motivated modeling method for volcanic clouds as a two fluids model. Some previous methods model smoke or clouds as one fluid, but the volcanic clouds can not be treated as one fluid. The volcanic clouds consist of the pyroclasts, the volcanic gas and the entrained air. Since the pyroclasts and the volcanic gas can be treated as one fluid, called magma, the volcanic clouds are regarded as two fluids, the magma and the entrained air. The modeling in the 3D analysis space can be simplified to enhance the performance. Since our approach is physics motivated, it can be used to generate physically reasonable and realistic images of volcanic clouds from the volcanic initial eruption to the equilibrium situation. | PDF |
__Ryoichi Mizuno__, Yoshinori Dobashi, Bing-Yu Chen, and Tomoyuki Nishita,
**Modeling Volcanic Clouds: a Physical, 3D and Efficient Method**,
*Full Conference DVD-ROM and Conference Select CD-ROM ACM SIGGRAPH 2003 Sketches & Applications - Simulating Nature*, San Diego (USA), July 2003. [ACM SIGGRAPH] ISBN: 1-58113-709-5 (DVD-ROM), 1-58113-711-7 (CD-ROM) —— Introduction: This paper presents an efficient method based on physical laws to model volcanic clouds. Some physical models have been proposed for simulating volcanic clouds [Woods 1988], but most of the previous models are only two or less dimensional or need huge calculation times. Our approach achieves a physical, 3D and efficient modeling of volcanic clouds. The dynamics of volcanic clouds is modeled using the 2FM (2 fluids model), which can treat two kinds of fluids in a scheme. Furthermore, modeling in the 3D analysis space is efficiently implemented by appropriate and reasonable simplification of the dynamics. | PDF |
__Ryoichi Mizuno__, Yoshinori Dobashi, and Tomoyuki Nishita,
**Volcanic Smoke Animation using CML**,
*Proc. International Computer Symposium 2002 (ICS 2002)*,**2**: 1375-1382, Hualien (Taiwan), December 2002. ISBN: 957-01-3035-0 —— Abstract: The animation of volcanic smoke is useful for natural disaster simulations, entertainments, etc. In this paper, we propose a model to generate realistic animations of the volcanic smoke. The model is designed by taking the eruption magnitude decided by the eruption velocity and the initial volcanic smoke density, the buoyancy generated by the difference between the volcanic smoke density and the atmospheric density, and the decreasing of the volcanic smoke density due to the loss of the pyroclasts (fragments of magma); i.e., this model is based on the physical dynamics of the volcanic smoke. In this model, the Navier-Stokes equations are used, and we solve the equations by using the method of the Coupled Map Lattice (CML) that is an efficient solver. Hence, in our system, the behavior of the volcanic smoke can be calculated in practical calculation time, and various shapes of the volcanic smoke can be generated by only changing some parameters. Therefore, realistic volcanic smoke animations can be created by our approach efficiently. | PDF |
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**Domestic Conference:**__Ryoichi Mizuno__, Yoshinori Dobashi, and Tomoyuki Nishita,
**Simulation and Visualization of Volcanic Cloud using 2 Fluids Model**,
*Proc. IPSJ 65th National Convention*,**4**: 111-112, Tokyo (Japan), March 2003. [Students' Incentive Award Paper] | PDF | [Japanese]__Ryoichi Mizuno__, Yoshinori Dobashi, and Tomoyuki Nishita,
**Animation of Volcanic Smoke using CML**,
*Proc. IPSJ 108th CG&CAD Summer Meeting (2002-CG-108)*, 115-120, Aichi (Japan), August 2002. | PDF | [Japanese]__Ryoichi Mizuno__, Satoru Yoshida, Yoshinori Dobashi, and Tomoyuki Nishita,
**Simulation and Visualization of Volcanic Smoke using CML**,
*Proc. IPSJ 64th National Convention*,**4**: 737-738, Saitama (Japan), March 2002. | PDF | [Japanese]
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**Thesis:**__Ryoichi Mizuno__,
**Modeling of Volcanic Clouds for Computer Graphics**,
*A Master Thesis of Dept. of Complexity Science and Engineering at The University of Tokyo*, February 2003. —— Abstract: The modeling of volcanic clouds is useful for natural disaster simulations, entertainments (e.g. games, movies), etc. However, in the field of computer graphics, the modeling of volcanic clouds has almost not been done so far. Then, this thesis proposes two approaches of the modeling of volcanic clouds for computer graphics. One of them uses coupled map lattice (CML) method, which is a kind of cellular automatons for generating patterns. By using the CML method, it becomes possible to simulate the behavior of the volcanic clouds efficiently. Moreover, to generate desired shaped volcanic clouds, some parameters that allow intuitively control of the volcanic clouds shape are provided. Therefore, by using the proposed method, the realistic behavior of volcanic clouds can be represented in a practical calculation time. The other approach uses the 2 fluids model (2FM). The 2FM treats two fluids in a scheme, and considers the interaction between the fluids. By using the 2FM, it becomes possible to consider the entrainment, which is essential factor of the dynamics of volcanic clouds. Moreover, the model is simplified based on a plausible assumption and an appropriate approximation. Therefore, by using the proposed method, the quantitatively reasonable three dimensional simulation of volcanic clouds behavior can be done in a practical calculation time. Moreover, this thesis presents a visualization method of volcanic clouds. | PDF |
__Ryoichi Mizuno__,
**Image reconstruction using parallel Monte Carlo simulations**,
*A Senior Thesis of Dept. of Physics at Sophia University*, February 2001. | PDF |
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[ Page Top ] *"Visual Computing" at The University of Tokyo (Winter Term, 2005 -2006)*: Teaching Assistant*IPSJ 65th National Convention (2003)*: Students' Incentive Award Paper*Pacific Graphics 2001*: Staff*SIGGRAPH 2001*: Japanese Representative Student Volunteer
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