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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.
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 ㎚.
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.
Significance of rescue hybrid endoscopic submucosal dissection in difficult colorectal cases
Hayato Yamaguchi,Masakatsu Fukuzawa,Takashi Kawai,Takahiro Muramatsu,Taisuke Matsumoto,Kumiko Uchida,Yohei Koyama,Akira Madarame,Takashi Morise,Shin Kono,Sakiko Naito,Naoyoshi Nagata,Mitsushige Sugimo 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.6
Background/Aims: Hybrid endoscopic submucosal dissection (ESD), in which an incision is made around a lesion and snaring is per-formed after submucosal dissection, has some advantages in colorectal surgery, including shorter procedure time and preventing per-foration. However, its value for rescue resection in difficult colorectal ESD cases remains unclear. This study evaluated the utility of res-cue hybrid ESD (RH-ESD). Methods: We divided 364 colorectal ESD procedures into the conventional ESD group (C-ESD, n=260), scheduled hybrid ESD group(SH-ESD, n=69), and RH-ESD group (n=35) and compared their clinical outcomes. Results: Resection time was significantly shorter in the following order: RH-ESD (149 [90–197] minutes) >C-ESD (90 [60–140] min-utes) >SH-ESD (52 [29–80] minutes). The en bloc resection rate increased significantly in the following order: RH-ESD (48.6%), SH-ESD (78.3%), and C-ESD (97.7%). An analysis of factors related to piecemeal resection of RH-ESD revealed that the submucosal dis-section rate was significantly lower in the piecemeal resection group (25% [20%–30%]) than in the en bloc resection group (40% [20%–60%]). Conclusions: RH-ESD was ineffective in terms of curative resection because of the low en bloc resection rate, but was useful for avoid-ing surgery.
Hayato Fukami,Katsuhisa Sunada 대한치과마취과학회 2022 Journal of Dental Anesthesia and Pain Medicine Vol.22 No.1
Background: The vasoconstrictive effect of epinephrine in local anesthetics affects the heart, which leads to hesitation among dentists in injecting local anesthetics into patients with cardiovascular disease. Due to its vasoconstrictive effects, the present study investigated the effects of vasopressin administration on cardiac function in rats. Methods: Experiment 1 aimed to determine the vasopressin concentration that could affect cardiac function. An arterial catheter was inserted into the male Wistar rats. Next, 0.03, 0.3, and 3.0 U/mL arginine vasopressin (AVP) (0.03V, 0.3V, and 3.0V) was injected into the tongue, and the blood pressure was measured. The control group received normal saline only. In Experiment 2, following anesthesia infiltration, a pressure–volume catheter was placed in the left ventricle. Baseline values of end-systolic elastance, end-diastolic volume, end-systolic pressure, stroke work, stroke volume, and end-systolic elastance were recorded. Next, normal saline and 3.0V AVP were injected into the tongue to measure their effect on hemodynamic and cardiac function. Results: After 3.0V administration, systolic blood pressures at 10 and 15 min were higher than those of the control group; they increased at 10 min compared with those at baseline. The diastolic blood pressures at 5–15 min were higher than those of the control group; they increased at 5 and 10 min compared with those at baseline. The preload decreased at 5 and 10 min compared to that at baseline. However, the afterload increased from 5 to 15 min compared with that of the control group; it increased at 10 min compared with that at baseline. Stroke volume decreased at 10 and 15 min compared with that of the control group; it decreased from 5 to 15 min compared with that at baseline. Stroke work decreased from 5 to 15 min compared with that of the control group; it decreased from 5 to 15 min compared with that at baseline. Conclusion: Our results showed that 3.0 U/mL concentration of vasopressin resulted in increased blood pressure, decreased stroke volume and stoke work, decreased preload and increased afterload, without any effect on myocardial contractility.