Advanced Materials Research Vol. 645

Abstract: A new method of speech enhancement is proposed based on morphological filter and wavelet transform. The system begins by first conducting morphological filtering, then distinguishing the unvoiced, voiced and noise using TEO in the wavelet domain. It then executes wavelet transform using different threshold on multiscale, and at the same time to improve the threshold function. Experimental results showed that the method not only suppressed noise effectively but also reduced the loss of the unvoiced. It also not only enhanced SNR, but also improved voice clarity and comfort. The merits it espouses makes it an effective speech enhancement algorithm.

Abstract: The paper discusses the optimization technology and algorithm features in the hydraulic system simulation. It presents the realization in the package. Detailed description of the principle and development is shown, focused on parameter optimization by parameter error integration and genetic algorithm which are realized in the optimization module. The application is an example of hydraulic system of injection molding machine which showed the efficiency and capacity of the module. The comparison between curves of simulation and experiment indicated the achievements, to find optimized hydraulic parameters efficiently and quickly so as to shorten the design cycle.

Abstract: The design of a speech signal acquisition and processing system is introduced. The collected data is analyzed and processed Using the powerful Matlab software, and this system is verified through the example.The system of mobile communication provides theoretical reference value in high quality speech communication service .

Abstract: Dimension reduction is an important issue to understand microarray data. In this study, we proposed a efficient approach for dimensionality reduction of microarray data. Our method allows to apply the manifold learning algorithm to analyses dimensionality reduction of microarray data. The intra-/inter-category distances were used as the criteria to quantitatively evaluate the effects of data dimensionality reduction. Colon cancer and leukaemia gene expression datasets are selected for our investigation. When the neighborhood parameter was effectivly set, all the intrinsic dimension numbers of data sets were low. Therefore, manifold learning is used to study microarray data in the low-dimensional projection space. Our results indicate that Manifold learning method possesses better effects than the linear methods in analysis of microarray data, which is suitable for clinical diagnosis and other medical applications.

Abstract: The phased array strapdown radar seeker’s detecting information is coupled with missile attitude information. Hence, the measurement information can not be used for proportional navigation directly. The method of reconstructing inertial line of sight (LOS) rate in phased array strapdown seeker is presented using the missile-target relative motion geometric and filtering algorithm. Considering measurement noise and nonlinearity of the phased array strapdown radar guidance systems, the principle of unscented kalman filter (UKF) is introduced to estimate LOS rate. The simulation results show that the reconstruction method is correct and the extraction of LOS rate is effective.

Abstract: An in-fiber Michelson interferometer (IFMI) is proposed and experimentally demonstrated. The configuration is formed by a thin-core fiber (TCF) following with a single mode fiber whose end tip is covered by a thick silver film as a mirror. The TCF excites cladding modes into downstream SMF via the mismatch-core splicing interface, and the low-order cladding modes can be reflected back to the fiber core via the mirror. A well-defined interference pattern is obtained due to the interference of between core and cladding modes. Experimental results represent that the device is linearly sensitive to the ambient temperature variation, and the selected interference dip of 1530nm represents a temperature sensitivity of 67.59pm/oC. The IFMI is compact and simple, and is a good candidate for ambient temperature measurement.

Abstract: Air flow and pollutant dispersion characteristics in a real valley city are studied under the real boundary condition. The 3D computational fluid dynamics using Reynolds-averaged Navier-Stokes modeling was carried out in Lanzhou which is a typical valley city in Northwest, China. The standard κ­-ε turbulence model as a simplified computational fluid dynamics model is used to provide moderately fast simulations of turbulent airflow in an urban environment. The modeled flow field indicated that the geometry, wind direction and source location had a significant effects on the flow field. The flow shows the funnelling is rather obvious when the wind flow through the narrow area in the middle of the city. It is obvious that in the high-altitude region, due to the impact of high and low differential pressure and terrain, SO₂ and NO₂ formed two cyclic concentration field in the dispersion process.

Abstract: The battery management technology is one of the key technologies in new energy battery promotion and application, and it is related to the security and life of the battery. For the convenience of a battery management system scale production in the future, a kind of test platform architecture is proposed according to the developed battery management system. The architecture includes a battery management system test platform and the tested battery management system, the battery management system test platform consists of the battery simulation signal source and the man-machine interface of the host computer. The required various battery condition simulation signals produced by the battery simulation signal source are controlled by the calibration parameters of the host computer; The man-machine interface is completed based on LabVIEW development environment, which is used to control the output of the battery simulation signal source, meanwhile it can collect, analyze and process operating parameters from the tested battery management system and diagnose self, thereby the test results and evaluation are given. The test results show that the test platform can achieve the calibration control function of battery simulation signal source as well as the test function to the battery management system, which has good real-time performance and reliability, and has certain significance to the industrialization of the battery management system.

Abstract: Developing highly efficient and reliable embedded system demands hardware/software co-design. To be high-configurable embedded systems, designers seek for transaction-level modeling and component based development. Our approach employ platform-based design and component-based design and apply it to a networked sensor system. We introduce a multiple-language environment unified component-based model and apply it to co-simulation of sensor system instances. The case studies demonstrate that our approach is readily applicable to real-world networked sensor systems and reduces the co-simulation complexities.

Abstract: This paper begins with a brief introduction of the installation method of the inclinometer tube and some related problems. And then the basic principle of the inclinometer is described. Afterwards, methods for the maintenance and protection of the inclinometer tube and the inclinometer in practical application are discussed according to engineering projects of foundation ditch monitoring. Finally, some solutions and advices on this issue are proposed. Nowadays, the cutting depth of foundation ditch is on the increase. And more and more foundation ditches are located on districts with dense ground facilities. Influenced by the nature of underground soil, loading conditions, construction techniques and many other factors, a foundation ditch may collapse and it may lead to cracks or even collapse of the surrounding buildings. So it is important to use precise inclinometers and carry out maintenance on them to eliminate safety hazards. The inclinometer technology is supposed to get a general understanding of the deformation characteristics and the deformation shape of the slope by monitoring the offset of the foundation ditch soil relative to the original condition. And based on this, displacement at different depths of the soil can be calculated, and it can be monitored whether the soil will lose stability. Thus, we can guide the construction more scientifically, reasonably and safely.