This study presents a data structure and algorithm for creating 3D voxel volumes from polygon meshes. A so-called VoxelWorld data structure that defines a voxel volume is presented, and an algorithm (including source codes) for generating a voxel volume is described in detail, based on this data structure. And the feasibility of the method proposed in this paper is examined through application examples. These examples demonstrate that a voxel volume is represented and stored with the one-dimensional array, a voxel volume is created from 3D files of various formats, and furthermore, the generation of multi-resolutional voxels is feasible. The programming language used in this study is Javascript, the graphic library is WebGL-based THREE, the CPU is Intel Core(TM) i7-7700K, the RAM is 16GB, and the PC used is Windows 10.

The individual permanent magnets of a typical magnetic gear are fan-shaped. When the shape is fan-shaped, the path length of the closed magnetic circuit formed from the high-speed side to the low-speed side is the shortest, and therefore the magnetic torque value is also the largest in that case. In this paper, when the repetitive shape of the magnetic gear is not fan-shaped, we analyze the magnetic force change characteristics and eddy current loss or solid loss due to pole switching. Using a finite element commercial tool, we analyze that these losses can be reduced by reducing the rapid magnetic changes of the magnet and modulator by configuring the fan shape to be inclined in the direction of rotation. Additionally, it is discussed through harmonic analysis that there is no significant change in the torque density generated.

Various epoxy composite materials, such as semiconductor packaging and fiberglass reinforced epoxy composites, are utilized in everyday life and industrial fields. The manufacturing process of these epoxy composite materials is generally carried out under isothermal and non-isothermal conditions in the reaction injection molding (RIM) process. To establish the process conditions, kinetic analysis of curing is necessary, and typical kinetic analysis is performed under isothermal conditions. However, maintaining isothermal conditions at the initial stages of the reaction is difficult, which can lead to errors from the beginning of the reaction. Therefore, by modifying the kinetic equations for application under non-isothermal conditions and conducting nonlinear optimization analysis, it was confirmed that the curing reactions at various heating rates can be effectively represented.

Following a study conducted two years ago, data on the power generation characteristics of PV systems provided by two public data monitoring systems(RECP and REMS) were used for analysis. The analysis was conducted for six inland regions and Jeju-island region. Compared to two years ago, it was confirmed that the data provided by the two monitoring systems was quantitatively more usable. In particular, it was found that the data correlation with GHI had increased significantly. Contrary to the suggestion that the Jeju Island area has low GHI and short power generation time, it was confirmed that there was no significant difference with the inland area when analyzed per unit solar radiation.

This paper presents the effects of properties of the haptic device and sample-and-hold methods on stability regions of a virtual object with a virtual spring and damper. The haptic system includes a haptic device with a mass and a damper, a virtual object modeled as a virtual spring and damper, and sample-and-holds. The relation among the maximum available virtual stiffness and damping, the mass and damping of the haptic device, and the sample-and-hold methods is analyzed using simulations. The simulation results show that, regardless of the sample-and-hold methods used, the stability region of the virtual model increases in proportion to the increase in the mass of the haptic device. However, even if the damping of the haptic device increases, it has little effect on the stability region of the virtual model with spring and damper. In addition, regardless of changes in the mass and damping of the haptic device, when using FOH, the boundary value of the virtual damper becomes 0.65 times as large as when using ZOH, while the maximum available stiffness becomes 1.1 times larger.

An experimental study was conducted using a IR camera to analyze the natural convection phenomenon occurring for the liquid in various size containers due to heating. Experiments were performed for each size of the square container and the height of the liquid, and the results were analyzed quantitatively. It was confirmed that the size of the container has a significant effect on the number of FC(flow cell) and the minimum height at which natural convection occurs. It can be seen that experiments with various container materials and liquids will be needed in the future.