Mitsubishi

About: Mitsubishi is a company organization based out in Tokyo, Japan. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 53115 authors who have published 54821 publications receiving 870150 citations. The organization is also known as: Mitsubishi Group of Companies & Mitsubishi Companies.

High-quality nonpolar m -plane GaN substrates grown by HVPE

Abstract: Relatively large size (about 10 mm × 10 mm) m -plane GaN substrates are grown by hydride vapor phase epitaxy (HVPE). The high crystalline quality of the substrates was observed by X-ray diffraction analysis. Typical full widths at half maximum values of X-ray rocking curves measured for the (100) and (102) reflections were 25–35 arcsec and 30–40 arcsec, respectively. The defect density distribution was analyzed from the [100] direction by the cathodeluminescence method. The dark spot density decreased in the growth direction and could be as low as 2.5 × 105 cm–2. No stacking faults could be seen. The surface roughness after the lapping, polishing and cleaning was measured by atomic force microscopy and the RMS roughness was 0.072 nm. All of the phonon modes that the selection rules allow have been observed in polarized Raman measurements. High-quality large-size m -plane GaN substrates will enable the realization of commercial production of nonpolar devices. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Keyword extraction apparatus, keyword extraction method, and computer readable recording medium storing keyword extraction program

Abstract: Disclosed is a keyword extraction apparatus and method capable of overcoming a problem in the conventional automatic keyword extraction wherein character strings in a sentence to be processed are employed, as they are, to assign a document with an index in terms of keywords; hence words having the similar meaning but different expressions in written language cannot be retrieved. The keyword extraction apparatus comprises technical term storage means for storing technical terms with proper expressions and different expressions thereof, and basic word storage means for storing general basic words of high frequency. Technical-term segmentation point setting means cuts out a range of any of the technical terms stored in technical term storage means from an input sentence. When the cut-out technical term is written in a different expression, the different expression is replaced by a corresponding proper expression in proper expression replacing means. Character-type segmentation point setting means detects a difference in character type in the input sentence. Basic-word segmentation point setting means cuts out, from the input sentence, a range of any of the basic words stored in the basic word storage means. Partial character string cutting means cuts out, as keywords, all relevant partial character strings based on segmentation points set by the technical-term segmentation point setting means, the character-type segmentation point setting means and the basic-word segmentation point setting means.

Semiconductor pressure sensor

Abstract: PURPOSE:To obtain a semiconductor pressure sensor in which a residual stress produced in the manufacture is reduced and which can measure an accurate pressure. CONSTITUTION:In a semiconductor pressure sensor, a pressure sensor chip 1, a pedestal 5, leads 8, wirings 9 and a die pad 7 are integrally sealed with a case except the front surface of a diaphragm 2 of a semiconductor pressure sensor chip 1 and a rear surface of the pad 7. The ratio of the thickness of the pedestal 5 to that of the chip 1 is set to 7.5 or less, and the ratio of the diameter of the case opening of the surface of the diaphragm 2 to that of the diaphragm 2 is set to 1 or more. According to this invention, a thermal stress generated in the chip 1 can be freely reduced to a desired value, and the sensor of necessary accuracy can be obtained. The sensor can be manufactured by a flow of general-purpose IC manufacturing steps, and the sensor having a low cost and high quality, can be obtained.

Association of leukocyte and neutrophil counts with infarct size, left ventricular function and outcomes after percutaneous coronary intervention for ST-elevation myocardial infarction.

Abstract: Elevated leukocyte count during ST-segment elevation myocardial infarction is associated with adverse clinical outcomes. Whether increased leukocyte count after primary percutaneous coronary intervention (PCI) directly reflects larger infarct size and left ventricular impairment is not known. The aim of this study was to assess the relation between leukocyte and neutrophil counts with infarct size and the left ventricular ejection fraction (LVEF) after primary PCI. Three hundred sixty-three patients from the Evaluation of MCC-135 for Left Ventricular Salvage in Acute Myocardial Infarction (EVOLVE) study, a randomized, double-blind, placebo-controlled trial assessing the efficacy of intracellular calcium modulator as an adjunct to primary PCI in patients with first ST-segment elevation myocardial infarctions, were evaluated. Total and differential leukocyte counts were measured before and serially after PCI. Infarct size and the LVEF were assessed using single-photon emission computed tomography after 5 and 30 days, and patients were followed up to 180 days. Total leukocyte and neutrophil counts obtained 24 hours after PCI were significantly correlated with infarct size (r = 0.34 and 0.37, respectively, p <0.001) and inversely correlated with the LVEF (r = -0.20 and -0.22, respectively, p <0.001). Patients with elevated leukocyte and neutrophil counts had larger infarct sizes (12.5% vs 5% and 13.5% vs 5%, respectively, p <0.001). The highest neutrophil quartile was associated with increased 180-day composite cardiac events (19% vs 20% vs 23% vs 45%, log-rank p <0.001). Elevated leukocyte and neutrophil counts independently predicted adverse cardiac events (hazard ratios 2.5 and 2.2, respectively, p = 0.001). In conclusion, elevated leukocyte and neutrophil counts after primary PCI in patients with ST-segment elevation myocardial infarctions are directly related to myocardial infarct size and the LVEF and are independent predictors of cardiovascular outcomes.