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Miyauchi, H.,Katou, N.,Tanaka, K. Elsevier Scientific Pub. Co 2011 Journal of wind engineering and industrial aerodyn Vol.99 No.11
The wind pressure, billow of a PVC sheet, and fastener load of a mechanically anchored waterproofing membrane system on a building rooftop were measured during a typhoon. The results showed that the waterproof sheet billowed upward, and the height of the billow was greater on the windward side that was under higher negative pressure. The axial and lateral forces acting on the fastener of the waterproof sheet were measured by a six-component force transducer, and it was found that the lateral force acting on the windward side of the fastener was larger. The tensile force acting on the fastener section was calculated using an equation for rooftop wind pressure. Finally, the method used to determine the fastener's position and the types of materials best-suited to cope with wind pressure on the roof were proposed, and the safety of this waterproof system was evaluated.
Low-Voltage and High-CMRR Differential Amplifier Using FG-MOSFET’s
K. Tanno,N. Horita,H. Tanaka,R. Miyauchi,H. Tamura 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, low-voltage and high-CMRR differential amplifier using two-input floating-gate MOSFET’s is presented. The proposed differential amplifier is based on the bulk biasing technique proposed by Monsurro. Monsurro’s amplifier, however, requires the low-boost circuits and twin-well process. In the proposed amplifier, these disadvantages are removed. The circuit is evaluated through Star-HSPICE with a set of device parameters of 0.35㎛ CMOS process. The simulations demonstrate a common-mode gain of ?59.5㏈ and a differential gain of 16.2㏈ with VDD = 1.4V. And the chip area is 131㎛×101㎛ from the mask layout design.
Bartko, M.,Miyauchi, H.,Tanaka, K. Elsevier Scientific Pub. Co 2013 Journal of wind engineering and industrial aerodyn Vol.119 No.-
The reliability of autoclaved aerated concrete (AAC) panels as a substrate for mechanically attached waterproof systems, subjected to the effects of strong winds, required verification. The strengths of fasteners in AAC panels were studied by static and dynamic tensile tests. The most commonly used mechanical and chemical fasteners were tested, and their strengths and AAC fracture modes were observed. Static strength values ranged from 2.0 to 5.0kN. The dynamic strength decreased from 1.5 to 2.2kN. Moreover, we eliminated extensive AAC fracture of the chemical fasteners by innovatively using elastic adhesive instead of the commonly applied epoxy resin. We examined the behavior of complete mechanically attached waterproof systems with such substrates by using a specially designed and produced constant-load-type dynamic-test apparatus. We tested two polyvinyl chloride (PVC) membrane types and two different membrane-to-disc connection methods. The number of repetitions until failure was as high as 100,000, and we recorded fracture modes identical to those occurring on actual roofs under the influence of strong winds. The relationship between the dynamic strengths of the fasteners and complete waterproof systems was presented, and AAC panels were confirmed to be substrates with a sufficient bearing capacity for mechanically attached waterproof systems. A method to determine the maximum fastener spacing was also proposed.