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Synthesis of Zirconium Carbide Nanosized Powders by Pursed Wire Discharge in Oleic Acid
Kenta Sugashima,Kazuma Suzuki,Tsuneo Suzuki,Hisayuki Suematsu,Koichi Niihara,Tadachika Nakayama 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.2
In this study, we propose novel PWD methods in inert gas mixed organic vapor and organic liquid which work as harmless carbon sources. Metal zirconium wire evaporation by PWD in organic vapor or liquid media was investigated. It was confirmed that in the PWD process using oleic acid liquid, single phase zirconium carbide nanopowders were synthesized by a reaction between Zr vapor and oleic acid. A new method for synthesis of carbide nanopowders was developed using the PWD in organic liquid. Therefore, the present result suggested that PWD method in oleic acid liquids is effective for the synthesis of carbide nanopowders.
Multi-Valued Classification of Text Data Based on an ECOC Approach Using a Ternary Orthogonal Table
Suzuki, Leona,Mikawa, Kenta,Goto, Masayuki Korean Institute of Industrial Engineers 2017 Industrial Engineeering & Management Systems Vol.16 No.2
Because of the advancements in information technology, a large number of document data has been accumulated on various databases and automatic multi-valued classification becomes highly relevant. This paper focuses on a multi-valued classification technique that is based on Error-Correcting Output Codes (ECOC) and which combines several binary classifiers. When predicting the category of a new document data, the outputs of the binary classifiers are combined to produce a predicted value. It is a known problem that if two category sets have an imbalanced amount of training data, the prediction accuracy of a binary classifier is low. To solve this problem, a previous study proposed to employ the Reed-Muller (RM) codes in the context an ECOC approach for resolving the imbalance in the cardinality of the training data sets. However, RM codes can equalize the amount of between training data of two category sets only for a specific number of categories. We want to provide a method that can be employed for a multi-valued classification with an arbitrary number of categories. In this paper, we propose a new configuration method combining binary classifiers with categories, which are not used for classification. This method allows us to reduce the amount of training data for each binary classifier while improving the balance of the training data between two category sets for each binary classifier. As a result, the computational complexity can be decreased. We verify the effectiveness of our proposed method by conducting a document classification experiment.
Multi-Valued Classification of Text Data Based on an ECOC Approach Using a Ternary Orthogonal Table
Leona Suzuki,Kenta Mikawa,Masayuki Goto 대한산업공학회 2017 Industrial Engineeering & Management Systems Vol.16 No.2
Because of the advancements in information technology, a large number of document data has been accumulated on various databases and automatic multi-valued classification becomes highly relevant. This paper focuses on a multivalued classification technique that is based on Error-Correcting Output Codes (ECOC) and which combines several binary classifiers. When predicting the category of a new document data, the outputs of the binary classifiers are combined to produce a predicted value. It is a known problem that if two category sets have an imbalanced amount of training data, the prediction accuracy of a binary classifier is low. To solve this problem, a previous study proposed to employ the Reed-Muller (RM) codes in the context an ECOC approach for resolving the imbalance in the cardinality of the training data sets. However, RM codes can equalize the amount of between training data of two category sets only for a specific number of categories. We want to provide a method that can be employed for a multi-valued classification with an arbitrary number of categories. In this paper, we propose a new configuration method combining binary classifiers with categories, which are not used for classification. This method allows us to reduce the amount of training data for each binary classifier while improving the balance of the training data between two category sets for each binary classifier. As a result, the computational complexity can be decreased. We verify the effectiveness of our proposed method by conducting a document classification experiment.
윤성원,Kenta Suzuki,Hideki Takagi,Hiroshi Hiroshima,Yoshinori Kinoshita,Katsuhiro Hayashi 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.8
High-aspect-ratio microstructures (HARMS) of polyimides have many applications, such as components of microelectromechanical systems and X-ray gratings. This study demonstrates the fabrication of HARMS with vertical and smooth sidewalls in a thick, soluble block-copolymer polyimide (SBCP) film by an UV-assisted thermal imprint process. A preheating condition was controlled as a parameter that dominated the imprint pattern fidelity. After investigating a proper prebaking condition, patterns with a width of 3.4 μm and a height of 35.1 μm with a high-aspect ratio of 10 were successfully structured in an SBCP film that has a thickness of approximately a hundred micrometers. The process has potential as a low-cost fine pattern fabrication process for polyimide-based polymers.
Toyoshima, Ryo,Yoshida, Masaaki,Monya, Yuji,Suzuki, Kazuma,Amemiya, Kenta,Mase, Kazuhiko,Mun, Bongjin Simon,Kondoh, Hiroshi The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.43
<P>We investigated the high-density CO adsorption phase formed on a Pt(111) surface when exposed to CO gas of pressure ranging from UHV to 100 mTorr using near-ambient-pressure (NAP)-XPS. Combined results from the NAP-XPS measurements and DFT calculations reveal the adsorption structure of CO molecules in the dense CO overlayer, which is stable under realistic conditions.</P> <P>Graphic Abstract</P><P>We investigated the high-density CO adsorption phase formed on a Pt(111) surface when exposed to CO gas of pressure ranging from UHV to 100 mTorr with near-ambient-pressure (NAP)-XPS. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp04318a'> </P>
( Hiroyasu Iwasaki ),( Takashi Mizushima ),( Yuta Suzuki ),( Shigeki Fukusada ),( Kenta Kachi ),( Takanori Ozeki ),( Kaiki Anbe ),( Hironobu Tsukamoto ),( Fumihiro Okumura ),( Takashi Joh ),( Hitoshi 대한소화기학회 2017 Gut and Liver Vol.11 No.1
Background/Aims: Self-expandable metallic stent (SEMS) placement is effective for dysphagia that results from malignant obstruction of the esophagus or gastric cardia; however, stent-related complications may be life-threatening. Thus, the goal of this study was to identify risk factors associated with complications following esophageal stenting. Methods: Of the 71 patients who underwent SEMS placement for dysphagia as a result of malignant stricture of the esophagus or gastric cardia, 53 patients with squamous cell carcinoma or adenocarcinoma, without previous SEMS placement, without a fistula, and without recurrent tumor after surgery were retrospectively identified. The occurrence of stent-related complications was used as an endpoint. Results: Stentrelated complications were identified in 26 patients (49.1%), and major complications occurred in 14 patients (26.4%). The use of an Ultraflex stent (odds ratio [OR], 6.81; 95% confidence interval [CI], 1.54 to 30.00; p=0.011) and prior chemotherapy (OR, 6.13; 95% CI, 1.46 to 25.70; p=0.013) were significantly associated with stent-related complications. Moreover, the use of an Ultraflex stent (OR, 19.60; 95% CI, 2.26 to 170.00; p=0.007) and prior radiation (OR, 25.70; 95% CI, 2.37 to 280.00; p=0.008) significantly increased the risk of major complications. Conclusions: The use of an Ultraflex stent and prior radiation and/or chemotherapy may represent risk factors for complications following esophageal SEMS placement. (Gut Liver 2017;11:47-54)
Brillouin Light Scattering을 이용한 GaAs/Fe/Au 구조의 자기이방성
하승석(Seung-Seok Ha),유천열(Chun-Yeol You),이석목(Sukmock Lee),Kenta Ohta,Takayuk Nozaki,Yoshishige Suzuki,W. Van Roy 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.4
It has been well-known that the Fe/GaAs heterostructure has a small lattice mismatch of 1.4 % between Fe and GaAs, and the Fe layer is grown epitaxially on the the GaAs substrate. There are rich physics are observed in the GaAs/Fe interface, and the spininjection is actively studied due to its potential applications for spintronics devices. We fabricated Fe wedge layer in the thickness range 0~3.4 ㎚ on the GaAs (100) surface with 5-㎚ thick Au capping layer. The magnetic anisotropy of the Fe/GaAs system was investigated by employing Brillouin light scattering (BLS) measurements in this study. The spin wave excitation of Fe layer was studied as the function of intensity and the in-plane angle of external magnetic field, and thickness of Fe layer. Also these various dependences were analyzed with analytic expression of spin wave surface mode in order to determine the magnetic anisotropies. It has been found that the GaAs/Fe/Au system has additional uniaxial magnetic anisotropy, while the bulk Fe has biaxial anisotropy. The uniaxial anisotropy shows increasing dependency respected to decreasing thickness of Fe layer while biaxial anisotropy is reduced with Fe film thickness. This result allows the analysis that the uniaxial anisotropy is originated from interface between GaAs surface and Fe layer.