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Isomura, Yoshinori,Yamamoto, Kichiro,Morimoto, Shigeo,Maetani, Tatsuo,Watanabe, Akihiko,Nakano, Keisaku Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.3
The voltage source PWM inverter generally used to drive the air conditioning (A/C) fans has been posing a large issue that the bearings in air conditioning fan motors are highly possible to be corroded electrically. Potential difference called shaft voltage is generated between inner and outer rings of the bearings due to inverter switching. The shaft voltage causes bearing lubricant breakdown dielectrically. As a result, bearing current is caused. This current causes the bearing corrosion. In previous work, we demonstrated that the shaft voltage can be reduced by using an insulator inserted between the outer and inner cores of the rotor in an air conditioning fan motor without grounding. This paper proposes the other countermeasure for reducing the shaft voltage in fan motors. The countermeasure which adds a capacitor between the brackets and the stator core is effective even for fan motors with non-insulated rotor. The effectiveness is confirmed by both simulated and experimental results.
Optimizing FT-Transformer: Sparse Attention for Improved Performance and Interpretability
Tokimasa Isomura,Ryotaro Shimizu,Masayuki Goto 대한산업공학회 2024 Industrial Engineeering & Management Systems Vol.23 No.2
In recent studies, a class of deep learning models has been suggested to provide higher prediction accuracy for tabular data than gradient boosting algorithms, the current mainstream approach for such structured data. In particular, the effectiveness of FT-Transformer (FTT), which customizes the transformer model to tabular data, has been shown in recent research. Transformer was initially proposed for unstructured data and have shown high performance by sensitively considering the relationships between all features (e.g., words and patch images) through the attention mechanism. However, the relationships between input variables (features) and an output variable in tabular data can be assumed less complex than those in unstructured data. Therefore, we propose FTT+, an improved FTT suitable for tabular data that improves performance by not excessively considering the unnecessary relationship between features in the transformers attention mechanism. In addition, we expand FTT+ as a strong explainable model by taking a novel approach based on the transfer learning method. The effectiveness and interpretability of our proposals are clarified through evaluation experiments on regression, binary classification, multi-level classification tasks, and multiple analyses of these results. With this studys contribution, the proposed models could be suggested as the new standard for all tasks using tabular data.
개에서 거세 후 발생한 봉합사 육아종의 병리조직학적인 연구
박천호,권영삼,이소무라 히로시,Park, Chun-Ho,Kwon, Young-Sam,Isomura, Hiroshi 대한수의학회 2002 大韓獸醫學會誌 Vol.42 No.3
Postoperative suture granuloma have rarely been reported in animals. Eight biopsy masses from testes areas of neutralized dogs were diagnosed as suture granuloma. The suture granuloma occurred at any time from several weeks to a few years after surgery and appeared to be testicular tumors by macroscopic examination. The granulomas were classified into three types based on the histopathological findings. The first type of pyogranuloma was mainly composed of neutrophils, macrophages, and suture fragments. The second type was chronic necrotizing granuloma which was well demarcated by fibrous connective tissues and was composed of a few suture fragments, macrophages and central fibrinoid necrosis. The third type of granuloma had a poorly defined margin with scarcely observed suture fragments and central necrosis in the tissue. These histopathological findings suggested that various types of suture granuloma may be caused by suture material and could even appear long after surgery.
Small Left Atrium: An Adjunctive Sign of Hemodynamically Compromised Massive Pulmonary Embolism
Yukihiro Hama,Tadayuki Yakushiji,Yoshie Iwasaki,Tatsumi Kaji,Naoei Isomura,Shoichi Kusano 연세대학교의과대학 2005 Yonsei medical journal Vol.46 No.5
Pulmonary embolism (PE) is a common disease with a high mortality rate due to right ventricular dysfunction and underfilling of the left ventricle. We present a case of a 33-year-old man with hemodynamically compromised massive PE. His left atrium was collapsed with marked dilatation of the right atrium and ventricle on multi-detector-row CT scans. The patient was treated with an intracatheter injection of a mutant tissue-type plasminogen activator and subsequently showed clinical and radiological improvements. The small left atrial size in combination with a right ventricular pressure overload was considered to be an adjunctive sign of hemodynamically compromised massive PE.
Ahn, Sejung,Kim, Yukyung,Beak, Seungjae,Ishimoto, Shohei,Enozawa, Hideo,Isomura, Eigo,Hasegawa, Masashi,Iyoda, Masahiko,Park, Yungwoo The Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.48
<p>We synthesized 4,5-bis(octadecylthio)-4′,5′-bis(ethylcarbamoyl)tetrathiafulvalene and measured the electrical conductivity of its perchlorate (ClO<SUB>4</SUB><SUP>−</SUP>)-doped nanofibers, which have double and triple helix structures. The nanostructure of the bis(octadecylthio)-TTF–diamide and its ClO<SUB>4</SUB><SUP>−</SUP>-doped fibers in a 3 : 1 ratio was deduced in relation to the X-ray crystal structure of bis(methylthio)-TTF–diamide. The doubly coiled nanofibers form when initially formed spiral ribbons of lamellarly arranged TTF–diamide perchlorate split in the middle, and a further split of the double helix produces the triplex structure. Temperature-dependent conductance and current–voltage (<I>I</I>–<I>V</I>) characteristics of the coiled fibers were measured in the temperature (<I>T</I>) range of 70–300 K. The conductance decreased with a decrease in <I>T</I>, and the <I>I</I>–<I>V</I> characteristics were nonlinear over the entire <I>T</I> range. The results were analyzed by using a modified fluctuation-induced tunneling conduction model, where the barrier height and width were linearly dependent on the electric field.</p> <P>Graphic Abstract</P><P>The double- and triple-helix nanofibers having tunneling conduction behavior are synthesized by splitting the spiral ribbons arising from lamellarly arranged TTF–diamide and intercalated perchlorate ion in the 3 : 1 ratio. <img src='http://pubs.rsc.org/ej/JM/2010/c0jm02628j/c0jm02628j-ga.gif'> </P>
Similarity in Neuronal Firing Regimes across Mammalian Species
Mochizuki, Yasuhiro,Onaga, Tomokatsu,Shimazaki, Hideaki,Shimokawa, Takeaki,Tsubo, Yasuhiro,Kimura, Rie,Saiki, Akiko,Sakai, Yutaka,Isomura, Yoshikazu,Fujisawa, Shigeyoshi,Shibata, Ken-ichi,Hirai, Daich Society for Neuroscience 2016 The Journal of neuroscience Vol.36 No.21
<P>The architectonic subdivisions of the brain are believed to be functional modules, each processing parts of global functions. Previously, we showed that neurons in different regions operate in different firing regimes in monkeys. It is possible that firing regimes reflect differences in underlying information processing, and consequently the firing regimes in homologous regions across animal species might be similar. We analyzed neuronal spike trains recorded from behaving mice, rats, cats, and monkeys. The firing regularity differed systematically, with differences across regions in one species being greater than the differences in similar areas across species. Neuronal firing was consistently most regular in motor areas, nearly random in visual and prefrontal/medial prefrontal cortical areas, and bursting in the hippocampus in all animals examined. This suggests that firing regularity (or irregularity) plays a key role in neural computation in each functional subdivision, depending on the types of information being carried.</P>
Yui Nanba,Yuhei Matsuda,Satsuki Watanabe,Mayu Takeda,Takafumi Abe,Kazumichi Tominaga,Minoru Isomura,Takahiro Kanno 대한구강악안면외과학회 2023 대한구강악안면외과학회지 Vol.49 No.5
Objectives: Although a few studies have investigated the relationship between kidney and oral function (number of remaining teeth), their results remain inconclusive. Therefore, this study aimed to investigate the relationship between kidney function and oral health in community-dwelling healthy elderlies and examine the factors associated with kidney function. Materials and Methods: We used cross-sectional data from the Shimane prefecture cohort recruited by the Center for Community-Based Health Research and Education in 2019. We collected clinical data on dental status, background factors and kidney function (estimated glomerular filtration rate [eGFR], mL/min/1.73 m2 and creatinine levels, mg/dL). Results: The study enrolled 481 participants, whose mean age was 66.7±7.4 years, and 223 (46.4%) participants were men. Multivariate analysis revealed significant correlations between eGFR (B=0.17, P=0.04), creatinine (B=–0.54, P<0.01), and the number of remaining teeth. The number of remaining teeth was associated with creatinine and eGFR, which are indicators of kidney function. Conclusion: This study suggests that preserving the teeth may prevent decline in kidney function. Dental professionals should provide instructions and professional care to reduce the risk of systemic diseases such as kidney dysfunction.