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Hiroshima, Japan

Hiroshima Institute of Technology is a private university in Saeki, Hiroshima, Japan. It was established by Tsuru Gakuen in 1961 as a two-year college, and became a four-year university in 1963, taking its present name. The university has faculties of engineering, applied information science, and environmental studies. Each has multiple departments.Alumni of Hiroshima Institute of Technology include comedian Yohichi Shimada, Robotics Pioneer Yokomichi Nobukatsu, architect Tōru Murakami, and software entrepreneur Toru Takasuka. Wikipedia.

Ochi K.,Hiroshima Institute of Technology | Okamoto S.,Japan National Food Research Institute
Chemistry and Biology

Activation/exploitation of biosynthetic pathways for useful metabolites is a major current interest. The metabolism remodeling approach developed by Craney and colleagues in this issue of (Chemistry & Biology), in which small molecule probes alter the secondary metabolites produced by streptomycetes, could lead to discovery of a multitude of novel antibiotics and other drugs. © 2012 Elsevier Ltd. Source

Lee H.S.,Hiroshima University | Yamashita T.,Hiroshima University | Mishima T.,Hiroshima Institute of Technology
Progress in Oceanography

In this paper, the multi-decadal variations of the Multivariate ENSO Index (MEI) and the Pacific Decadal Oscillation (PDO) index were studied to determine their influence on tropical cyclones (TCs) using the empirical mode decomposition (EMD) method and Hilbert spectral analysis. The ENSO and PDO are closely associated with various oceanic and atmospheric factors that govern TC activities in the western North Pacific (WNP). From the analysis results, multi-decadal oscillations with characteristic periods of 13 and 32.5. years from MEI, and about 16.7 and 32.8. years from PDO, were obtained. These values showed good agreement with the values obtained in other studies. The results of category 4-5 TCs and category 5 TCs also showed possible multi-decadal oscillations of about 15- and 37-year timescales, indicating that low frequency multi-decadal oscillations of intense TC occurrence in the WNP is influenced by the multi-decadal oscillations of ENSO and PDO. When seeking adaptation and mitigation measures for future climate scenarios, the multi-decadal variations of climate and their impacts on extreme events such as TCs should be taken into account together with the background of the global warming trend. © 2012 Elsevier Ltd. Source

Ebara R.,Hiroshima Institute of Technology
Procedia Engineering

Corrosion fatigue crack initiation behavior of various kinds of stainless steels is reviewed mainly on the basis of the author's experimental results. The role of corrosion pit in the corrosion fatigue crack initiation process of martensitic, ferritic, austenitic, duplex and precipitation-hardening stainless steels is briefly summarized. The recent investigation of an electrochemical noise measurement method is demonstrated for 12%Cr martensitic stainless steel and 2.5%Mo containing high strength austenitic stainless steels. Finally a couple of future problems to be solved in corrosion fatigue crack initiation are touched on briefly. © 2010 Published by Elsevier Ltd. Source

Tanaka K.,Hiroshima Institute of Technology
Natural Hazards and Earth System Science

A meteotsunami hit southwest Kyushu on 25 February 2009, with an estimated maximum amplitude of 290 cm, which was higher than that recorded for the 1979 Nagasaki event. This study investigated mesoscale meteorological systems over the East China Sea during the time leading up to the February 2009 event using a Weather Research and Forecast model. The disturbance in the sea-level pressure originated from a gravity wave over southeastern China. The sea-level pressure disturbance observed and modelled over the East China Sea had its source over the southeastern China mountains and was then propagated by a jet stream toward western Japan with the help of both wave-duct and wave-CISK (conditional instability of the second kind) mechanisms. Two synoptic systems supported the momentum convergence and the formation of band-shaped unstable layers in the mid-troposphere. The high-latitude trough extended from eastern Siberia and there was subtropical high pressure over the western Pacific Ocean. The phase speed of the atmospheric wave was as high as 25-30 ms-1, corresponding to the phase speed of long ocean waves on the East China Sea. Improvements in determining the amplitude and timing of the disturbance remain for future work. © 2010 Author(s). Source

Ochi K.,Hiroshima Institute of Technology | Hosaka T.,Shinshu University
Applied Microbiology and Biotechnology

Genome sequencing of Streptomyces, myxobacteria, and fungi showed that although each strain contains genes that encode the enzymes to synthesize a plethora of potential secondary metabolites, only a fraction are expressed during fermentation. Interest has therefore grown in the activation of these cryptic pathways. We review current progress on this topic, describing concepts for activating silent genes, utilization of "natural" mutant-type RNA polymerases and rare earth elements, and the applicability of ribosome engineering to myxobacteria and fungi, the microbial groups known as excellent searching sources, as well as actinomycetes, for secondary metabolites. © 2012 The Author(s). Source

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