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Hayato Kume,DaeWoong Kim,Tatsuro lshii 한국디자인학회 2015 한국디자인학회 학술발표대회 논문집 Vol.2015 No.10
In recent years, as a result of improvements in the awareness about special education and development of medical science, the number of children diagnosed with developmental disabilities tends to increase. Special education must be devised for teaching materials and learning contents to suit the students. For this reason, continuous high-quality education is difficult. Therefore, the use of learning materials on tablet devices is effective. The purpose of this study is to produce a learning application for tablet devices that many students can use by adjusting the difficulty of the teaching materials to the corresponding academic ability of students.
Self-assembly of Fine Particles Applied to the Production of Antireflective Surfaces
Hayato Kobayashi,Nobuyuki Moronuki,Arata Kaneko 한국정밀공학회 2008 International Journal of Precision Engineering and Vol.9 No.1
We introduce a new fabrication process for antireflective structured surfaces. A 4-inch silicon wafer was dipped in a suspension of 300-㎚-diameter silica particles dispersed in a toluene solution. When the wafer was drawn out of the suspension, a hexagonally packed monolayer structure of particles self-assembled on almost the complete wafer surface. Due to the simple process, this could be applied to micro- and nano-patterning. The self-assembled silica particles worked as a mask for the subsequent reactive ion etching. An array of nanometer-sized pits could be fabricated since the regions that correspond to the small gaps between particles were selectively etched off. As etching progressed, the pits became deeper and combined with neighboring pits due to side-etching to produce an array of cone-like structures. We investigated the effect of etching conditions on antireflection properties, and the optimum shape was a nano-cone with height and spacing of 500 ㎚ and 300 ㎚, respectively. This nano-structured surface was prepared on a 30 × 10-㎚ area. The reflectivity of the surface was reduced 97% for wavelengths in the range 400-700 ㎚.
Maltitol Prevents the Progression of Fatty Liver Degeneration in Mice Fed High-Fat Diets
Hayato Urushima,Yasuaki Sanada,Miki Sakaue,Yuji Matsuzawa,Toshinori Ito,Kazuhisa Maeda 한국식품영양과학회 2015 Journal of medicinal food Vol.18 No.10
Nonalcoholic fatty liver disease (NAFLD) progresses to nonalcoholic steatohepatitis, ultimately leading tocirrhosis and liver cancer. It is important to prevent this progression during the initial stages of hepatic fatty degeneration. Maltitol is a polyol produced by the hydrogenation of maltose. We investigated the efficacy of maltitol for treating hepaticfatty degeneration in C57BL/6 male mice using a high-fat diet model. Intake of 5.0% maltitol for 8 weeks significantlysuppressed weight gain, hepatic fatty degeneration, hyperglycemia, and hypercholesterolemia. With maltitol intake, sterolregulatory element-binding protein 1c (SREBP1c) mRNA expression was significantly decreased, and farnesoid X receptor(FXR), peroxisome proliferator-activated receptor α (PPARα), and hydroxymethylglutaryl-Co reductase expressions weresignificantly higher in the liver. The increase in SREBP1c and suppression of FXR and PPARa expressions are correlated withNAFLD. Our results suggest that maltitol may prevent steatosis of NAFLD with a high-fat diet.
A Parallel Genetic Algorithm and Its Variance Analysis for A New Multiple Knapsack Problem
Hayato Miyagi,Morikazu Nakamura 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper presents some results of experimental evaluation on the fitness varieties in parallel genetic algorithms based on tree topology migrations. The evaluation focuses on the relation between the solution quality and the fitness varieties. We perform the evaluation for the typical tree topologies; the star, line, and balanced binary tree with varying migration interval since the solution quality of the parallel genetic algorithm depends on the kind of the topology and migration interval. The results show that the line topology can keep the chromosome variety of the GA and obtain better quality of solutions since the topology has the longest distance between the root and the leaves.
Hayato Ikoma 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.S1
The development of self-healing concrete has witnessed several strides in the last three decades. Among these is the understanding of the mechanisms of self-healing concrete, as well as the realization of new technologies of enhancing crack self-healing in concrete. Previous research suggests that crack closing mechanism occurs due to mainly 1) Hydration of anhydrous cement, 2) Formation and crystallization of Calcium Carbonate, 3) Swelling of cement matrix and 4) Sedimentation of particles in the crack interstices. In this research however, after investigating them one by one it was found that these mechanisms do not explain the drastic water flow recovery that occurs in the early stages of water permeation through cracked concrete. It then prompted direct visual observation of water flow through crack narrow space; and with this an interesting finding was observed-the air bubble effect. It was observed that water flow through the narrow crack openings creates air bubbles by various water action mechanisms. The created air bubbles narrow water flow paths in the crack causing significant water flow reduction in the initial and later stages of water supply condition.
Hayato Asada,Tsuyoshi Tanaka,Satoshi Yamada,Hiroaki Matoba 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.4
This Paper proposes a method to improve plastic deformation capacity of the welded wide flange beam-to-columnconnections in existing steel buildings by using supplemental H-section haunches jointed by high-strength bolts and weldingwhich expected to secure construction quality. By attaching supplemental haunches to upper and lower flanges of the beam end,the critical section is moved from the beam end to the beam cross-section corresponding to the tip of the supplemental haunch. As a result, it could prevent the fracture of beam flange initiated from toe of weld access hole. Cumulative plastic deformationcapacities of retrofitted specimens were 1.5 to 2.0 times larger than that of un-retrofitted specimen.