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Binary Document Classification Based on Fast Flux Discriminant with Similarity Measure on Word Set
Keisuke Okubo,Gendo Kumoi,Masayuki Goto 대한산업공학회 2019 Industrial Engineeering & Management Systems Vol.18 No.2
Fast Flux Discriminant (FFD) is known as one of the high-performance nonlinear binary classifiers, and it is possible to construct a classification model considering the interaction between variables. In order to take account of the interaction between variables, FFD introduces the histogram-based kernel smoothing using subspaces including variable combinations. However, when creating a subspace, the original FFD should cover all variables including combinations of variables with low interaction. Therefore, the disadvantage is that the calculation amount increases exponentially as the dimension increases. In this study, we calculate the similarity between variables by using KL divergence. Then, among the obtained similarities, divisions are performed for each subspace with similar variables. Through this method, we try to reduce the amount of calculation while maintaining classification accuracy by using only combinations of variables that are likely to take high interaction. Through the simulation experiments with Japanese newspaper articles, the effectiveness of our proposed method is clarified.
Development of Seahorse Robot Capable of Expressing Happiness, Sadness and Anger
Keisuke Sayama,Yuki Suzuki,Hun-ok Lim 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper describes the mechanism and the control system of a seahorse robot that is able to express happiness, sadness and anger. MP motion sensors (Pyroelectric Motion Detection Sensor), force sensors, and color sensors are employed to express emotion. The seahorse robot consists of a base, a body and a head. It has 4 DOFs (2 DOFs in the head and 2 DOFs in the body) and it weighs 800 [g]. Emotion expression experiments are conducted to confirm the mechanism and the control system of the robot and are evaluated by ten subjects. After they watch the body color and motion), they select one of five emotions. The effectiveness of the mechanism and the control of the robot are verified through emotion experiments.
Study of rocking motion of rigid body with slide contact
Keisuke Nozaki,Yoshiaki Terumichi,Kazuhiko Nishimura,Kiyoshi Sogabe 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4
The purpose of this study is to formulate the motion of a rigid body with unilateral contact problems by applying techniques of multibody dynamics and to analyze the issue of rocking condition of rigid bodies with slide contact. In To investigate rocking motion with slide contact, we formulate for dynamics of a simple rigid body system with a unilateral contact model. Judgment for the occurrence of contact between a rigid body and a base is applied. The planar motion of a rigid body system having a simple shape and both with and without slide cases is assumed. Using constraint conditions for the contact as algebraic equations, the rocking motion of the rigid body, including slide and frictional force, is analyzed. The differential algebraic equation is solved by the augmented method with Lagrange multipliers, using generalized coordinates and independent variables that describe the contact points. The influence of the frequency and amplitude of disturbance given to the base is discussed.
Keisuke Masuda,Hiroko Okuno,Minako Wakasa,Saeko Sakai 한국아동학회 2017 兒童學會誌 Vol.38 No.4
Objective: The aim of the present study was to evaluate outcomes of the Teaching-Family Model (TFM) as an intervention for maltreated children who exhibit noncompliance and problematic behavior, in a Japanese residential treatment setting. Methods: The effect of the TFM on 44 children (mean age, 13.6 years; age range, 6–18 years) was assessed using the count data for noncompliance, evaluated by the direct care staff, and problematic behaviors, assessed by the Child Behavior Checklist (CBCL). Data were collected at three time points (at the implementation of the TFM and at 6 months and 1 year after implementation) and compared to assess changes. Results: At 1 year after the TFM, a significant decrease in noncompliance (noncompliance with the rules: F [2, 78] = 4.41, p = .015; noncompliance with following the instructions: df = 2, χ² = 6.31, p = .043) was seen. Significant decreases were also seen in CBCL T-scores at both 6 months and 1 year after the TFM (total problems: F [2, 86] = 361.20, p 〈 .001; internalizing problems: F [2, 86] = 287.26, p 〈 .001; externalizing problems: F [2, 86] = 193.44, p 〈 .001). Conclusion: These results suggest that the use of a TFM may promote positive changes in problematic behavior displayed by maltreated children in Japanese residential treatment settings.
( Keisuke Kojima ),( Naoki Sunagawa ),( Kiyohiko Igarashi ),( Paul Dupree ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.1
Xylan is the major hemicellulose. The main chain is consisted of xylose residues, whereas the side chain differs by the plant species. For instance, xylan from hardwood is substituted by glucuronic acid and acetylated. In nature, fungi degrade xylan, producing various enzymes. In general, xylan main chain is degraded into xylooligosaccharides by xylanase. Thus, its substrate recognition is a crucial for the efficient digestion of xylan. Ample studies have reported about xyalanases’ substrate specificities towards xylan and xylooligosaccharides substituted with glucuronic acid. On the other hand, little is known about the effect of acetylation due to difficulty in extracting acetylated xylan. The basidiomycetes Phanerochaete chrysosporioum is a model organism for white rot fungi. P.c degrades hardwood in nature and has various enzymes. P.c has three xylanases belonging to GH family 10 and 11. In general, wood decay fungi have GH family 10 xylanases and mold has GH family 11 xylanases. Therefore, this study prepared substrates, investigated the reaction property of two xylanases from the P.c and compared GH family 10 and 11 xylanases’ characteristics. Finally, we proposed xylan degradation system using each xylanase.
Shield Effect of High-Response Electromagnetic Sensor
Keisuke Fujisaki,Shinpei Fujino,Shoji Sato,Shoji Taniguchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
To obtain a high-response electromagnetic sensor, the mechanism of shield effect is made clear, where the copper shield is arranged between the primary coil and the secondary coil. To estimate it, a new index is introduced as a ratio of effective magnetic flux among the magnetic flux linked to the secondary coil. According to the numerical calculation, the insertion of the copper shield makes the responsibility index increase. Since the effective flux ratio increases by inserting the copper shield, the magnetic flux is considered to be used effectively to detect the molten steel among the secondary voltage.
A Method of High Efficient Control for Induction Motor
Keisuke Iwasaki,Akiko Takahashi,Ryuichi Oguro 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes the controlling method for induction motor operating at high efficiency in transient state.We propose a method of current control to minimize stator current in case of giving torque we want. First of all, weunderstood problems of vector controlled for induction motor and suggest methods to solve these problems. In the simulation, the efficiency in the transient state is evaluated by comparing the copper loss between two methods.
Algebraic Computation of the Stability Radius of a Multilinear Polynomial
Keisuke HASEGAWA,Masaaki KANNO,Shinji HARA 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes an algebraic algorithm for the computation of the stability radius of a multilinear poly no-mial. Two algebraic conditions are used to characterize the stability radius and they are exploited to calculate the stability radius. Two numerical examples are provided for demonstration purposes.