Advanced Materials Research Vols. 204-210

Abstract: The basic principle of switching power supply EMI filter was described. The circuit principle of passive EMI filter and several topology circuit of active EMI filter were introduced. Active EMI filter with feedforward, active EMI filter without current detection sensors installed and active EMI filter for three-phase inverter motor were researched. The problem that following the frequency rising of switching power supply, the EMI noise pollution was becoming more and more serious than before was solved. These growing pollutions had resulted in widespread application of EMI filter technology and in the meantime higher requirements were raised to EMI filter technology.

Abstract: For poor accuracy of detection of the urban traffic network classification, the Support Vector Machine (SVM)is applied to classification of traffic incidents.This paper presents a traffic pattern classification method based on multi-class support vector machine, and design the network structure of the detection system. Simulation results show that: compared to other algorithms, the network, which is valid for urban transportation classification, has the advantages of high detection rate and low false alarm rate for small samples.

Abstract: Calibration is an essential work in three-dimensional scanning system. The operation of existing calibration is complex and tedious. In this paper, we design a DLT-based automatic method of calibration, in which the calibration reference points are detected automatically. Then we can figure out a series of calibration parameters from these points. The average value of all parameters is just the calibration parameters. The experimental results show that the method we proposed is not only guaranteeing the calibration precision but also simplifying the calibration operation comparing with the traditional manual calibration method.

Abstract: This paper discusses different united brake control strategies of electric vehicle (EV), presents a novel H_∞ robust united brake control strategy for EV. Research work is done under different conditions namely variable battery voltage and variable load rotational inertia, separately. A comparison between conventional PID control and H_∞ robust control is done when they are applied to the above mentioned conditions. Under the united brake condition, the experimental results show that the braking distance is shortened by the united brake system in the emergent brake; the braking ability of the EV is improved. H_∞ robust control has better performance than the traditional PID control both in steady-state tracking error and response speed.

Abstract: In this paper, based on bifuzzy theory, we have studied the multiobjective programming problem under bifuzzy environment, and presented the expected-value model which is a deterministic multiobjective problem. To the expected value model, the concepts of non-inferior solution are defined, and their relations are also discussed. According to practical decision-making process, a solution method, called the method of main objective function, has been studied, whose results can facilitate us to design algorithms to solve the bifuzzy multiobjective programming problem.

Abstract: In resent years, secure communication is becoming one of the study hotspot in information safety. Secure communication is a way of correspondence, which transmits the desired information in the channel by adopting encryption measure, and then carries on decryption in receiver to recover the messages. Chaotic encryption is making use of random-like characteristic of the chaotic signal to encrypt the plaintext, and secure the real time communication. Taking one sine and square wave signal for examples respectively, the information can be encrypted by using the model of one-way coupled map lattice. Also, it is available to actualize encryption and decryption of the information by choose different keys when the model requires the matching keys precisely.

Abstract: Course evaluation is an important and necessary means to improve the level of course. A new course evaluation method based on fractional grey relational distance and analytic hierarchy process (AHP) is proposed in this paper. Firstly, the proportion of the different influence factors can be determined through constructing judging-matrix and calculating-back-to-one and dealing with the checkout of coherence. Secondly, qualitative evaluation indicators are quantified by fractional-order system, and quantitative indicators are processed by idealization and normalization. And then association coefficient is defined. Finally, correlation distance degree is proposed. The new similarity degree reflects the relatedness and the different shape among a selected scheme, the ideal solution and negative ideal solution. Through the application to actual course assessment instance, the results show its practicability and effectiveness.

Abstract: A challenge to the tranditional awareness looms larger and lager nowadays. In the 21st century, enterprises must build up a strategy of harmonious marketing, maintaining a pattern of sustained marketing. Under the circumstance of market economy, the perception of harmonious marketing within enterprises agrees with the idea of developing harmonious society. Therefore, under today’s development of harmonious society, enterprises should not only pay close attention to customers, but also take the relationship among society, nature, rivals, employers and other partnership into account, creating a harmony of interests and competitive edge.

Abstract: A hybrid fiber optically powered current transformer with the Hall element is studied and developed in this paper. The sensing probe is the zero-flux current transformer which is based on Hall Effect. The main current can be insulated from the measurement circuit by use of Hall current transformer. Due to the broad bandwidth characteristics and the high linearity between the Hall potential and measured magnetic flux density and the high sensitivity of the Hall current transformer, any changes in the excitation current can be accurately detected without distortion. The three-dimensional model of the Hall current transformer is set up by use of ANSYS software in this paper. The magnetic flux density in the opening air-gap is calculated by nonlinear magnetic analysis method of the three-dimensional finite element. Experimental data shows that the calculation method and results are reliable. At the same time, high power laser power supply is adopted to drive the electronic devices in high potential side, and the reliable insulation between the high potential and low potential is achieved by optical fibers. So the accuracy of this measurement system can be ensured.

Abstract: Customer misbehavior tends to descend service delivery efficiency and social civilization and has become an important and difficult problem of service enterprises, with a small amount of researches and even less in China. The studies remain on the qualitative analysis and the quantity of researches on the consequence is the least. Therefore, based on the existing literature review, deep interviews and open questionnaires survey, this paper uses the widely accepted tool for the development of measurement methods, and develops a reliable and effective scale of customers’ reactions to other-customer misbehavior, which could be the measurement tool for further researches.