名古屋大学 List of Products and Services

Since the record-breaking hit movie "AVATAR" was released in the winter of 2009, numerous 3D films have been screened as of 2010, ushering in an era now referred to as the "Year of 3D." Various electronics manufacturers have also begun to release 3D televisions, making it easier for the general public to enjoy 3D visuals. However, there are concerns about the physical effects of continuously watching 3D images, such as decreased vision, eye strain, headaches, and nausea. The causes of these symptoms vary greatly among individuals and remain insufficiently understood at this time.

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In recent years, three-dimensional imaging has rapidly spread in society, with more opportunities for the general public to experience it through 3D movie screenings and the sale of 3D televisions. Electronics manufacturers are strengthening their products with 3D-related features, aiming for market expansion. Despite its increasing prevalence, the effects of stereoscopic vision on human visual function have not yet been fully understood. Considering the safety of three-dimensional imaging, it is extremely important and essential to examine its impact on the human body.

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As part of my research on the boundary element method, I conducted studies on: 1) solving sequential shape optimization problems using the boundary element method, 2) optimal design of coil spring cross-sectional shapes using the boundary element method, and 3) research on adaptive mesh methods in the boundary element method. Additionally, I authored a text for engineering beginners on the boundary element method and finite element method titled "Numerical Methods for Partial Differential Equations," as well as a related text on linear algebra titled "Linear Algebra for Computation." The Trefftz method is a boundary-type analysis method, but it differs in that it uses integral equations without singularities. Therefore, I advanced research on the engineering applications of the Trefftz method, including: 1) proposing a sensitivity analysis method using the Trefftz method, 2) proposing a higher-order design sensitivity analysis method using the Trefftz method, 3) proposing an adaptive mesh method for the Trefftz method, 4) simulating the sloshing phenomenon of water surface waves using the Trefftz method, and 5) conducting thermal conduction analysis of functionally graded materials using the Trefftz method. I served as a guest editor for a special issue commemorating the 70th anniversary of the Trefftz method in an international journal. I also authored "Introduction to the Trefftz Method."

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In recent years, the number of traffic accident victims has significantly decreased due to improvements in safety technology by automobile manufacturers and the development of Intelligent Transportation Systems (ITS). On the other hand, the number of injured individuals in traffic accidents is at an all-time high. One of the reasons for this is that while modern transportation systems are well-equipped in terms of facilities and infrastructure, they are still developing in terms of education. Additionally, the lack of awareness of traffic risks among those involved in accidents is also considered a problem. Regarding the current state of traffic safety education, drivers receive high-quality education using driving simulators in a 3D environment at driving schools. In contrast, pedestrians primarily learn through textbooks and are not provided with a favorable learning environment for traffic safety in terms of visibility and engagement. Furthermore, it is generally difficult for individuals to receive high-quality traffic education in a 3D environment on their own. Currently, there are numerous studies and systems that simulate traffic flow and environments. There are also educational software for traffic safety aimed at children that use characters, as well as traffic education systems that provide a sense of three-dimensionality through sequential photographs. However, these, including simulators, are primarily targeted at drivers and do not offer interactive 3D educational systems for pedestrians.

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One of the main causes of eye strain during 3D video viewing is identified as the "inconsistency between the accommodation distance of the lens and the convergence focal distance." However, in our past research involving young subjects, it was found that the accommodation distance of the lens and the binocular convergence focal distance change synchronously during 3D viewing, just as they do during natural vision. In this presentation, we will demonstrate the simultaneous measurement of the accommodation distance of the lens and the binocular convergence focal distance during actual 3D video viewing, clarifying that they change synchronously. Additionally, the 3D video will use the trademark Power 3D(TM) from Olympus Visual Communications, Inc.

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