Advanced Materials Research Vols. 915-916

Abstract: This device uses GPS module to sample the data, and transmits data with the wireless module. The handheld terminals can display information such as longitude, latitude, time independently. The transmitting section collects data which is parsed and processed by the MCU, and displays it on the Liquid Crystal Display (LCD). The receiver receives and analyses wireless data, then displays the data including the current geographic information through the upper machine at the same time. Experiments show that the device could realize the function of positioning and transferring information within 200 meters and we could also use Google Map, the PC software, to get map information. This device, compared with the traditional system, is small in size, light in weight, easy carrying and can accurately position an object. It can be widely used in the sphere of investigation, exploration, navigation and positioning.

Abstract: Multi-CPU[1] parallel computing system [2] with mixed modes is the product of parallel computing idea. Control system cannot guarantee real-time control performance due to limitation of computing speed while utilizing complex control algorithms, so operating efficiency of the system needs to be solved. High-speed computing [3] system is needed. Parallel algorithm [4][5] is an effective way to improve computing speed. Mixed-mode parallel computing system is a hardware platform with multiple parallel computing modes. Users can directly change the connecting mode between computing modules through jumper, and the diversity of communication modes provides solutions for various problems.

Abstract: Passive control and semi-active control of vibration in mechanical systems have recently successfully been used in automobiles and airplanes suspension systems. These control techniques are able to guarantee the performances of all vibration structures. Unfortunately, the knowledge and data has not been readily applied to human prosthetics. The information collected can be directly applied to accelerate research into dampening for prosthetics. A focus of this paper is on modeling and controlling vibrations by a given impulse onto prosthetic legs. Simulations of using passive control and idealized skyhook dampening are using Matlab to complete. Through model analysis, control variable, simulation procedures and comparison of two modeling, the models have been refined and with idealized skyhook dampening suspension provide significant improvement of the body characteristics compared with passive suspensions.

Abstract: Cooperative positioning (CP) is one of the core features in intelligent transportation systems (ITS) which is used to increase the positioning accuracy via wireless communication between vehicles and infrastructures. The global navigation satellite system (GNSS) is always unavailable near black spot such as the curve which needs to be solved. So, in this paper, a novel CP scheme is proposed for the curve warning scenario with limited GNSS by utilizing the information of received signal strength and pointer angular of the roadside unit which is in a special dual-transmitter outphasing architecture. An extended Kalman filter is founded to estimate the real-time position of the vehicle in the curve section. The whole warning scenario is analyzed by computer simulation, and the result shows the feasibility of the method.

Abstract: Stripe noise always occurs in line-scan images which can seriously affect the image quality for future usage. To eliminate the stripe noise from the polluted line-scan images, a hybrid approach for stripe noise removal in frequency domain was presented. Firstly, the mathematical model of the stripe noise was established to describe its character. Secondly, the information of the stripe noise was separated from other information of the image by wavelet decomposition. Then, a band stop filter was designed for removing the stripe noise from the separated details band in spatial-frequency domain of Fourier. At last, the denoised image was obtained after wavelet reconstruction. The results indicate that the proposed approach can remove the stripe noise effectively from the polluted line-scan image while preserving as much details of the object in the image as possible.

Abstract: Heat flow calculation is a reliable method to estimate the vibration about temperature, main factors of the existence of marine gas hydrates below seafloor. It would increase the accuracy of resources volume estimating and reduce cost of exploration significantly. Depth of Bottom Simulating Reflectors (BSRs), known as the base of gas hydrate stability zone (GHSZ), is a critical variable in this calculation. It should be recognized and mapped using the good quality three-dimensional (3D) pre-stack migration seismic data. By introducing heat flow derived from the depths of BSRs, this method would improve the resolution of the profiles and the quality of imaging and can be used in the specific areas.

Abstract: Hysteresis cycle is one of the most important characteristics for magnetic materials.Preisach model is one of most used model in practice for modeling the hysteresis cycle. This paper deals with analytical modeling of hysteresis cycle using the powerful mathematical tools from LabVIEW. Preisach method is also modified by LabVIEW,this way of modeling is good for a fairly large number of entry points.

Abstract: With the development of the signal processing and the medical technique, EEG (electroencephalogram) check has been usually used to analyze the brain activity in the clinical medical, which can distinguish the abnormal circadian state from the normal circadian state. Here puts forth Lyapunov index analysis method to analyze the circadian state by the medical personnel or researcher, and the validity of the method is verified in some related graph through computer simulation, and all the method bridges a connection between the Chaos state and the medical EEG diagnoses.

Abstract: SAR images are widely used in land use cover classifications. This paper proposed using multifractal spectrum parameters to analyze texture of SAR images. First multifractal theory and spectrum calculation method were introduced. Multifractal spectrum of a chaos representation was gotten with the method. From the spectrum curve, five parameters were found to describe the curve features. Then the physical meanings of five parameters in multifractal spectra were analyzed. Multifractal spectra of three kinds of textures in a SAR image are calculated, and five parameters are extracted. Finaly we analyzed the three textures according to physical meanings of five parameters. It is seen that the parameters of multifractal parameters can be used to describe different SAR image textures. It is a novel way to distinguish SAR image textures by multifractal spectrum parameters.

Abstract: A feature extraction scheme for rolling element bearing (REB) fault diagnosis by editing the cepstrum of the original vibration is introduced in this paper. In the presented approach, the order analysis technology is utilized to convert an even-time-spaced scaled signal to an even-angle-spaced signal by resampling the acquired signal. The discrete lines belonging to gears are removed by editing the cepstrum. Then, the signal is reconstructed from the edited cepstrum. Lastly, clear characteristic frequencies related with the faulty REB can be obtained by the envelope spectrum analysis. Simulation studies indicate that this method can be employed to detect the REB faults in a gearbox with a high accuracy by removing the strong gear vibration disturbances.