Objective A portable EEG real-time acquisition and analysis system based on MSP430 was designed. Methods According to EEG characteristics, front-end amplifier circuit and filter circuit were designed. MSP430 was chosen as the core in this system. After acquisition,the signal data were transferred to PC by USB through PL2303. The data were received by PC and processed by software in real-time. In text experiment,the ideal signal produced by a signal generator was conversed by an AD converter. Under the control of MSP430,the signal was transmitted to the PC through the USB port and was processed in real-time.Results An acceptable signal was obtained at PC by using this system. In the following text,the EEG signals of a normal subject under two states: lunch break( light sleep) and wakefulness relax( listening to music),were obtained and analyzed in frequency domain in real-time. And the results were good. Conclusions The system is easy to carry and use,with wide application prospects,especially in college laboratories.
Singing performance is a recreation of music art. Its success involves the following factors: the over - all grasp of the creation purpose of the original, the mobilization and input of the singer' s emotion, the accumulation and preparation of emotional experience, the combination of techniques with emotion and so on.
For decades, the study of congruence in organizational research has relied on difference scores, which induces numerous methodological problems in presenting congruence, such as covered relations, reduced reliability and validity. Unfortunately, this method is still used dominantly in domestic researches due to few available alternatives. The method of polynomial regression is introduced in this research to directly test relationships among two component measures of difference scores and dependent variables, and also the advantages of polynomial regression over difference scores in expressing congruence are discussed and verified. Then, from the aspects of foundation points, theoretical derivations, analytical procedures and hypothesis tests, the framework of polynomial regression equations coupling with response surface analysis for congruence researches are modified. Three key features of surface are concerned for analysis. The first is stationary point, which corresponds to the overall minimum, maximum, or saddle point of the surface. The second is principal axes of the surface, two of which intersect at the stationary point. The upward or downward curvature of surface, depending on the shape of surface (convex or concave), is greatest along one of the principal axes and least along the other. The third feature is the slope of the surface along two principle axes, Y = X and Y = -X lines. Formulas expressing these key features can be derived from coefficients of polynomial regression equations, based on which, this general framework clarifies how coefficients from equations can be used to comprehensively describe surface and test hypotheses. Moreover, the framework permits researchers to evaluate complicated congruence conceptual models rigorously. Finally, as an illustration, how the person-organization value congruence affects persons’ affective commitment to change in four dimensions are examed, which specifies the characters of surfaces and puts forward theoretical implications. This paper deliberately interprets how data analytical results deduce theoretical conclusions based on the framework mentioned above. The results reveal that the congruence effects completely supported by traditional methods are not perfect, and should even be rejected as to two of four value dimensions with the same data. In sum, current research testifies that polynomial regression equation not only can explain more variance of dependent variables than difference scores, but also uncover more valuable relations and information. Firstly, it exhibits whether the perfect congruence effects exist. Secondly, it exams main effects, congruence effects and interaction effect at the same time. Thirdly, it reveals scores and changing rate of dependents under imperfect congruence condition. Admittedly, the framework and the required analytical modes presented in this paper are more complicated than previous methods. However, approach to this method enables researchers to study congruence in a more comprehensive way. Practical implications derived from this study point toward the actual effect of person-organization value congruence in management activities.
In order to analyze the flow characteristics of the units in the closed suction tank,Siping pumping station was simulated by using CFD method.The difference of hydraulic loss and interior flow field were compared for the single pump,two pumps and three pumps operating at different operating conditions.The results show that there are obvious differences between suction sump and closed tank's sets.Because the distance between the inlet and wall of tank is shorter,the impact water has a larger influence on unit's water absorbing,which leads to a relatively worse flow pattern for intermediate units but much better for boundary units.Therefore,combination operation of boundary units should be considered first when single or two pumps operate for the pumping station with water absorbing tank.
WT5”BZ]:The method of numerical computation for color image rendering,which aims to calculate the tristimulus values of vision responses from the surface reflecting spectral power distribution in the scene,is presented in this paper.The linear model is exploited to approximate the reflecting continuous spectrum of the object surface and numerical computation is conducted via Gaussian quadrature (GQ) and Riemann summation (RS).The tristimulus values are converted to chromatic coordinates which match the images captured by CCD camera.The experiment results are promising. [WT5”HZ]
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