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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.
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.
Mitsuhiro Kato,Kenta Tomimura,Kanako Ishii 한국식물병리학회 2020 Plant Pathology Journal Vol.36 No.5
Satsuma dwarf virus (SDV) seriously damages citrus production by reducing the quality and yield of fruit. To avoid contamination with SDV, mother trees are checked to be SDV-free in advance of nursery tree distribution. In this study, we compared an immunochromatographic assay (ICA) kit with double-antibody sandwich enzyme-linked immunosorbent assay (DASELISA) for large-scale diagnosis of SDV in orchardgrown trees in Shizuoka Prefecture, Japan. The two methods gave conflicting results for 11 of 1,705 samples, all of which were negative by DAS-ELISA but positive by ICA. The samples scored as positive by either DASELISA or ICA were analyzed by reverse transcription polymerase chain reaction and all were confirmed to be positive. These results validate the use of ICA as a screening method for large-scale diagnosis. Strain discrimination revealed that 16 of 22 isolates belonged to SDV, while citrus mosaic virus (CiMV) infection only and co-infection (SDV and CiMV) were in a minority.
Effective feedback algorithm for application of MI-simulation to turbulent orifice flow
Mitsuhiro Nakao,Kenji Kawashima,Toshiharu Kagawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Measurement-integrated simulation (MI-simulation) is a numerical simulation in which experimental results are fed back to the simulation. The calculated values become closer to the experimental values. In this paper, we propose a new feedback method based on the conservation of momentum for MI-simulation built-in standard k-εmodel to turbulent orifice flow. The axial velocities in simulation are compensated by using proportional controllerusing the estimated pressure distribution based on the conservation of momentum. The signals are fed back to the axial velocity control volumes in the cross section downstream of the orifice. The effectiveness of the method was confirmed compared with the experimental results at downstream of orifice.