Applied Mechanics and Materials Vols. 719-720

Abstract: A new type of transverse flux permanent magnet motor with surface-type permanent magnet rotor structure and silicon steel stator structure was designed. According to the new structure of transverse flux permanent magnet motor, the operating principle of the motor was given. The relationship among motor output torque, torque density, magnetic poles and winding parameters are deduced, and a reasonable method of designing motor size parameters was proposed. A three-dimensional finite element model of the motor was created and the model grid division was done using ANSYS finite element analysis software. According to different winding current values and different positions of stator and rotor, the motor magnetic flux density distribution, the output torque and inductance parameter were given through calculating the three dimensional finite element models. Finite element analysis results show that the new motor structure is reasonable.

Abstract: The mechanism of cable crosstalk involving what and how does the factors affect the level of crosstalk is introduced in detail. A transmission line model for predicting crosstalk between power cable and the other wires nearby with common reference ground based on multiconductor transmission theory (MTL) is developed. Crosstalk among circuit configurations when the victim cables with load terminations are different types is analyzed and simulated. Models where the types of the victim lines are shielded coaxial cable, shielded twisted pair and unshielded twisted pair are simulated. It is found that the shielding can provide an attenuation of about 50dB than the unshielded cables. In addition, the condition of multi-cable coupling is simulated and some thoughts are brought out to inspire more detailed study. Finally, some measures are suggested to suppress the crosstalk between cables according to the two-type of coupling mechanism (inductive coupling and capacitive coupling).

Abstract: The environment of a smart home is highly dynamic, where resources, such as devices, services and applications, can be introduced or removed at a moment’s notice. Thus the probability of failures, such as device, network, and service failures, is improved. It is challenging to improve the availability and reliability of services compositions in smart home. In this paper, we propose an architecture for rapid reconstruction of services compositions in smart home. It can rapidly achieve failure capturing and recovery. We build ASM (Abstract State Machines) ground model [1] to analyze the correctness of the process of the reconstruction of services compositions in smart home.

Abstract: In pervasive computing environments, a single service is often unable to meet the complex needs of users. A composite service is a combination of services to provide value-added services that a single service cannot achieve. Thus, it is important to ensure that services protocol are compatible. This paper provides a formal description of service protocol, a new definition of services protocol compatibility and a algorithm for automatic generation adapter for incompatible services protocol.

Abstract: In order to implement non-polar transmission of the data, in this paper, we took a new way to solve the problem by automated correction method, which used the RS485 standard as physical layer protocol, used multi-function meter Convention (DL/645-1997) as implementation layer protocol, and implemented the data transfer protocol in the FPGA platform data transfer protocol. This paper introduced the design way, simulation waveforms and measured results, and solved reserve connection of the traditional polarity RS485 communication.

Abstract: The Internet has revolutionized the telecommunication systems by supporting new applications and services. Voice over Internet Protocol (VoIP) is one of the most prominent telecommunication services based on IP. Asterisk is a popular VoIP services programs. Asterisk supports many of audio codecs. The paper describes the VoIP based SIP, which is built by Asterisk. And it analyzes the bandwidth of G.711, G.726-32 and GSM. From the real traffic flow of audio data, it gets the radio of bandwidth. It provides valuable assessment to design the campus network’s VoIP.

Abstract: A wideband wedge-angle microstrip patch log-periodic antenna with 16 units operates at the center frequency 2.45GHz, is presented in this paper. Design an antenna interactive calculator with Visual Basic software to calculate and to adjust antenna parameters conveniently. Then, construct, simulate, and optimize the antenna model by use of Ansoft HFSS software. The patch log-periodic dipole antenna (LPDA) is tested by PNA3621 vector network analyzer. Measurement results show that the antenna has good characteristics with symmetrical radiation pattern, broad bandwidth, little number of side lobes, and voltage standing wave ratio with echo loss are relatively ideal in 2GHz~3.2GHz frequency range, which agree well with the simulation results.

Abstract: This paper analyzes the disequilibrium of wireless network data traffic, gives analysis and research methods for regional disequilibrium and time disequilibrium characteristics, and proposes a data traffic prediction method for regional users in consideration of redundant traffic.

Abstract: The purpose of this paper is to develop a practical method which integrate the mighty function of GIS with KBS (Knowledge Based System) .It emphatically bring forward a prototype of KBGIS. The research is an example of GIS-KBS integration in which the elements of KBS techniques are actually integrated with GIS. The idea of the prototype KBGIS system design was to put the model, data, domain knowledge, and the system's knowledge acquisition and reasoning mechanism and GIS together into a same environment.

Abstract: WSNs can cover a wide range of application. Node deployment is a fundamental factor in determining the connectivity, coverage, lifetime and cost of WSNs. This paper focuses on the cost of network that satisfies some constraints (coverage, connectivity and lifetime). In order to satisfy the connectivity and coverage, we use the regular hexagonal cell architecture. We present a new metric, the Cost Per Unit Area and Lifetime, to be objective function. Three programming models are proposed under different scenarios. For reasons of space, we present briefly the method to solve above models and some analysis.