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Mitsuhiro Uemura 대한설비공학회 2018 International Journal Of Air-Conditioning and Refr Vol.26 No.2
Enhancement of forced-convection boiling heat transfer by electric field is investigated experimentally. When a high-temperature horizontal filament is immersed in water, a gas sheet is formed around and the above filament due to liquid boiling, in the early immersion process. This gas-sheet markedly decreases the boiling cooling rate of the filament. Here, forced collapse of the gas sheet is attempted by imposing an electric field to enhance the boiling cooling rate, In the experiments, a horizontal platinum wire of 0.5 mm in diameter is immersed in pure water under atmospheric pressure, and a DC voltage up to 600 V is applied between the wire surface and an electrode made of glass placed 10 mm apart. The whole boiling curve is measured under different applied voltages and wire-falling velocities in 0.5 to 2.0 m/s range, and at subcooling of 60 K. The experimental results show that the electric field is effective in promoting the disintegration of the gas sheet. Under the tested conditions, boiling cooling rate increased two-fold for an applied electric field of 600 V/cm. This result shows that the use of an electric field to break up the gas-sheet has resulted in a remarkable increase in the cooling rate at high superheats during initial cooling period, which is even greater than that used in the existing material manufacturing processes by the rapid cooling method, and therefore, this method may contribute to developing new materials.
Japanese Financial Instability and Weaknesses in the Corporate Governance Structure
Mitsuhiro Fukao 서울대학교 경제연구소 1998 Seoul journal of economics Vol.11 No.4
The sudden collapse of major financial institutions in November 1997, which were subject to examination by the authorities and external auditors, brought about the extraordinary situation whereby financial institutions lost mutual trust in the soundness of business operations. The interbank money market started to malfunction and an intense credit crunch emerged. Japanese financial institutions, companies and Asian nations faced a severe tightening of bank credit. The biggest causes of this turmoil are the Japan's weak accounting system, and the excessive stock portfolio held by banks. To restore confidence in Japan's financial system, corporate governance of financial institutions must be overhauled.
Epidermal keratinocytes as the interface of body and environment
( Mitsuhiro Denda ) 한국피부장벽학회 2008 한국피부장벽학회지 Vol.10 No.2
Recently, a range of sensors that respond to physical or chemical environmental factors has been identified in the peripheral nervous system. In particular, TRP receptors, which respond to mechanical stress, osmotic pressure, temperature and chemical stimuli, are expressed in epidermal keratinocytes. Neurotransmitters and their receptors, which play a crucial role in information processing in the central nervous system, have also been found in keratinocytes. These results suggest that epidermal keratinocytes are equipped with similar sensing and information processing systems to those in the peripheral and central nervous systems. It had been long considered that only nerve C-terminals in the epidermis play a role in skin surface perception. However, we now propose a novel concept of the skin sensory system, i.e., first, keratinocytes recognize various environmental factors, and then the information is transferred to peripheral and whole body systems.
One-step-ahead MTTF Prediction for Online Software Reliability Monitoring with Bootstrap Scheme
Mitsuhiro Kimura 대한산업공학회 2015 대한산업공학회 추계학술대회논문집 Vol.2015 No.11
This study provides a one-step-ahead software reliability prediction method by MTTF for the next software failure occurrence time in the software testing phase. The method can be an online software reliability monitoring tool. Although the derivation of the one-step-ahead MTTF has been shown in the literature, however in this article, we present the mean of the onestep-ahead MTTF and its confidence intervals by using bootstrap scheme. An actual dataset is analyzed for the demonstration of the proposed method.