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THE CONDUCTANCE OSCILLATION IN QUASI-ONE-DIMENSIONAL FIBONACCI T-SHAPE ARRAY
Shinkichi Horie,Akira Suzuki 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.3
We have studied the conductance properties of semiconductor quantum waveguides for the periodic and the quasi-periodic T-stub (T-shaped quantum wire) array in semiconductor quasi-onedimensional systems by utilizing the Landauer formalism at nite temperatures. Our calculations show a distinctively dierent conductance feature between the periodic T-shaped array and the quasi-periodic T-shaped array. This dierence depends on the rule for the arrangement of the T-stubs.
Locomotion Control of Multi-Legged Robot based on Follow-the-Contact-Point Gait
Tomoya Niwa,Shinkichi Inagaki,Tatsuya Suzuki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes a new control scheme of decentralized multi-legged robot based on Follow-the-Contact-Point(FCP) gaitcontrol. In this control scheme, the first legs contact the points allocated on the terrain and the following legs touch the foot on the point which the fore leg is contacting. By creating adequate contacting points on the environ-ment, the robot can benavigated successfully. Since the position in for mation of the contacting points is relayed based on physical in for mation of the legs, each leg does not need the global position of the contacting point. As a result, the pro-posed control scheme realizes decentralized architecture. This paper in troduces the control law for the robot walking one venter rain. Finally, the result of physicals imulation of 20-legged robot shows the availability of the proposed method.
Antioxidant Capacity and Phenolic Content of Rumex dentatus L. Grown in Egypt
Abdelnaser Abdelghany Elzaawely,Shinkichi Tawata 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.1
Rumex dentatus L. (Family: Polygonaceae) is a weedy plant widely distributed in many countries including Egypt. It has been used in the Mediterranean diet as a leafy vegetable and its leaves and roots exhibited various biological activities. In our study, total phenolics, antioxidant capacities assayed by 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging and β-carotene bleaching methods and reducing power were evaluated in different extracts/fractions of leaves and roots of R. dentatus grown in Egypt. In addition, their phenolic compositions were determined by GC-MS and HPLC. The results showed that total phenolic content in the ethyl acetate fractions of leaves and roots were high and measured at 169.5 and 257.4 mg gallic acid equivalent per g extract, respec-tively. The ethyl acetate fractions of leaves and roots exhibited strong DPPH activity and the DPPH IC 50 values were 0.021 and 0.012mg mL -1 of leaves and roots, respectively. Furthermore, the ethyl acetate fractions of leaves and roots showed high reducing power and antioxidant activity assayed by β-carotene bleaching method. GC-MS and HPLC analyses indicated that these fractions con-tained a variety of phenolic compounds including p-hydroxybenzoic acid, syringic acid, vanillin, benzoic acid, ferulic acid, and cin-namic acid. Our study verified that the ethyl acetate fractions of leaves and roots of R. dentatus have strong antioxidant activities which are correlated with its high levels of phenolic compounds and therefore, they could be utilized as a natural source of antioxi-dant in food industry.
Identification of Human Skill based on Feedforward / Feedback Switched Dynamical Model
Hiroyuki Okuda,Hidenori Takeuchi,Shinkichi Inagaki,Tatsuya Suzuki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
To realize the harmonious cooperation with the operator, the man-machine cooperative system must be designed so as to accommodate with the characteristics of the operator’s skill. One of the important considerations in the skill analysis is to investigate the switching mechanism underlying the skill dynamics. On the other hand, the combination of the feedforward and feedback schemes has been proved to work successfully in the modeling of human skill. In this paper, a new stochastic switched skill model for the sliding task, wherein a minimum jerk motion and feedback schemes are embedded in the different discrete states, is proposed. Then, the parameter estimation algorithm for the proposed switched skill model is derived. Finally, some advantages and applications of the proposed model are discussed.
Antioxidant Capacity and Phenolic Content of $Rumex$ $dentatus$ L. Grown in Egypt
Elzaawely, Abdelnaser Abdelghany,Tawata, Shinkichi 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.1
$Rumex$ $dentatus$ L. (Family: Polygonaceae) is a weedy plant widely distributed in many countries including Egypt. It has been used in the Mediterranean diet as a leafy vegetable and its leaves and roots exhibited various biological activities. In our study, total phenolics, antioxidant capacities assayed by 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging and ${\beta}$-carotene bleaching methods and reducing power were evaluated in different extracts/fractions of leaves and roots of $R.$ $dentatus$ grown in Egypt. In addition, their phenolic compositions were determined by GC-MS and HPLC. The results showed that total phenolic content in the ethyl acetate fractions of leaves and roots were high and measured at 169.5 and 257.4 mg gallic acid equivalent per g extract, respectively. The ethyl acetate fractions of leaves and roots exhibited strong DPPH activity and the DPPH $IC_{50}$ values were 0.021 and $0.012mg\;mL^{-1}$ of leaves and roots, respectively. Furthermore, the ethyl acetate fractions of leaves and roots showed high reducing power and antioxidant activity assayed by ${\beta}$-carotene bleaching method. GC-MS and HPLC analyses indicated that these fractions contained a variety of phenolic compounds including $p$-hydroxybenzoic acid, syringic acid, vanillin, benzoic acid, ferulic acid, and cinnamic acid. Our study verified that the ethyl acetate fractions of leaves and roots of $R.$ $dentatus$ have strong antioxidant activities which are correlated with its high levels of phenolic compounds and therefore, they could be utilized as a natural source of antioxidant in food industry.
Identification of Hybrid System based on Probability Weighted Multiple ARX Model
Shun Taguchi,Tatsuya Suzuki,SoichiroHayakawa,Shinkichi Inagaki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes a Probability weighted ARX(PrARX) model where in the multiple ARX models are composed by the probabilistic weighting functions. As the probabilistic weighting function, a ‘softmax’ function is intro-duced. Then, the parameter estimation problem for the proposed model is formulated as a single optimization problem. Furthermore, the identified PrARX model can be easily transformed to the corresponding PWARX model with com-plete partitions between regions. Finally, the proposed model is applied to the modeling of the driving behavior, and the usefulness of the model is verified.
Analysis and Synthesis of Driving Behavior based on Mode Segmentation
Toshikazu Akita,Tatsuya Suzuki,Soichiro Hayakawa,Shinkichi Inagaki 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper presents the development of the modeling of human driving behavior based on an expression as a hybrid system (HS) focusing on the driver’ vehicle following task. In our modeling, a relationship between the diver’ sensory information and the output of driver is expressed by the piecewise ARX (PWARX) model, which is a class of the HS. As the sensory input, the range between vehicles, range rate, and time derivative of the area of the back of the preceding vehicle (called KdB) are considered. Also, the pedal operation is considered as the output. The identification problem for the PWARX model is solved using the clustering based technique. By introducing the PWARX model, it becomes possible to find not only parameters appearing in the operation in each mode but also parameters in the logical switching (decision making) conditions among them from the measured driving data. Furthermore, the obtained model is exploited for the design of assist system especially focusing on the switching condition of the ON/OFF of assist. The usefulness of the proposed assist system is confirmed by experiments.