Volume 1 Issue 1
Authors: Guang Dong; Luping Jiang; Xiaohan Zhang
Abstract: This paper introduced the present research and development trend of intelligence home and home gateway, studied network driver of embedded Linux system, and designed function and software structure of home gateway network. It gave the method of network driver and the corresponding data structure, and introduced in detail the embedded Linux Socket programming and serial interface operation.
Keywords: Intelligence Home; Home Gateway; Embedded Linux; Network Driver; Serial Interface Operation
Authors: M. Rouholamini; S. Esmaeili; A. V. Mahdavinia
Abstract: It is demonstrated that compensating of reactive power increases the voltage profile improvement in a distribution system especially in rural networks or industries which are so far from high voltage substation. However, reactive power sources are expensive, needing large scale of investment. This paper presents an applicable method to define the number of static reactive power generating units and their optimal position in a radial network. The proposed method improves voltage profile and power losses simultaneously. To solve the optimization problem, simulated annealing algorithm has been used to minimize a dual fitness function consist of voltage drop and power losses. The method uses an economic criterion to choose the best number and location of reactive power sources. Finally, the proposed algorithm is implemented on a test network called “seda sima” which is one of the middle voltage networks in Bardsir city, Kerman, Iran. The simulation results using Matlab 2009a are presented by verifying the effectiveness of the proposed method.
Keywords: Reactive Power Source; Distribution System; Voltage Profile; Power Losses; Simulated Annealing Algorithm
Authors: A. V. Chigarev; A.V. Borisov
Abstract: The given work deals with the model of stability of a human body as a multilink pivotal pattern with concentrated masses in the phase standing on a skid foot. The moments in joints, providing static posture of a human body, are modeled by the springs of a certain deflection rate. The zones of deflection rate of the springs, necessary for balance maintenance, are defined in the work. A possibility of practical realization of the appliance in the form of exoskeleton with a person inside and its vertical balance maintenance is considered hereinafter. A generalization of the obtained for the case of a bio-mechanical system consists of a random finite number of links. To construct the solution let us first record the potential energy of the system. Then it is expanded into Maclaurin series. After that, the notations, which suitably represent the potential energy for the application of the criterion of Sylvester are introduced. The solution of inequalities is done numerically. The graphs are constructed for a visual representation of the obtained solutions. It was stated that the spring stiffness zones necessary for maintaining vertical posture a man in exoskeleton are large. Minimum required stiffness notations are of the main practical interest, since only these values can be sufficient while creating an exoskeleton enough these values. They can be determined graphically. These are the lower bound areas of the graphs. This model can be applied to create anthropomorphic robots while resolving a question of their static posture balance and the necessary structural elements. In practice, exoskeletons can be used in military technologies, medicine, gerontology, sports, industry, in everyday life, etc. wherever it is necessary to offload or enforce a natural human skeleton. Therefore, this work can be considered relevant for practical realization of human-machine system as well.
Keywords: Balance; Exoskeleton; Stability; Joints; Deflection Rate Of Springs; Single-support Phase; Statics
Authors: S. P. K. Babu; A. V. Meenakshi; S. Banu; A. Vishwapriya; R. Yogamathi; S. Malaiarasan
Abstract: In this paper, a N-way multi-frequency equal Wilkinson power divider (WPD) is proposed, implemented and analyzed. The proposed N-way power divider is based on microstrip line with 50 ohm characteristic impedance. The dividers are composed of multi-section transmission line and isolation resistors. They provide high isolation and very good input/output ports matching simultaneously at arbitrary design frequencies. The power divider geometry is analyzed using ADS simulator and the performance metrics such as insertion loss, return loss and isolation loss is computed. This study reports the successful implementation of microstrip line based 16-way Wilkinson power divider with low losses for a frequency range of 0 to 3 GHz with 1.5GHz centre frequency.
Keywords: Advanced Design System (ADS); Wilkinson Power Divider (WPD); Printed Circuit Board (PCB); Microstrip Line (MLIN); Transmission Line (TLIN)