Advanced Materials Research Vols. 490-495

Abstract: In order to improve the performance of crawler paver’s traveling and reduce the paver’s straight traveling deviation, a new control plan of paver’s traveling system was proposed. In the control plan, the left wheel control method adopted velocity closed loop control in order to keep constant-speed moving of the paver. The right wheel control method adopted the series structure of fuzzy control and PID control in which the fuzzy controller slightly adjusted the right wheel set point of PID controller according to the distance difference variable and velocity difference variable of paver’s left wheel and right wheel. In the working condition of straight paving, the real time deviation correction is achieved to assure paver’s straight traveling.

Abstract: In order to improve the recovery of braking energy in electric vehicles, a braking force distribution control strategy is proposed which the braking force proportion of the front and rear wheels are distributed according to the brake strength, by analyzing the vehicle braking mechanics and related braking regulation, and combining with the motor output characteristics. A simulation is carried out with SIMULINK/ADVISOR, the results show that, comparing with ADVISOR braking force distribution control strategy, the control strategy not only meets braking stability well，but also there are obvious advantages in energy consumption per 100 kilometers，the rate of braking energy recovery and utilization.

Abstract: When ship navigating in the winding channel, a transverse drifting distance will be produced due to some dynamic factors, such as wind and current; meanwhile, the rudder must be frequently used to alter course so that the vessel can be navigated safely in the channel. Because of the above reasons, the width of the water area that is need to carry out altering course maneuvering is greater than that is needed to navigate straightly. Giving full consideration of drifting due to wind and current, the value of widened channel when altering course in winding channel, this paper puts forward the mathematical model for width in winding channel.

Abstract: Under the uncertain battle environment, the key to completing battle task of UCAV is that whether the dynamic task could be assigned in real-time and effective method. Dynamic task assigned arithmetic of UCAV is put forward based on auction mechanism principle in this paper. Arithmetic flow is shown, benefit calculation function is constructed and algorithmic efficiency is analyzed in this paper. Simulation experiments indicate that this algorithmic reduces more calculating quantity and has better real time character compared with traditional method.

Abstract: We have successfully demonstrated the use of 2-D and 3-D OCT for early detection and diagnosis of oral premalignancy and malignancy. Our results demonstrate the feasibility of diagnostic imaging within the oral cavity using this modality. Noninvasive evaluation of neoplasia-related epithelial and subepithelial changes throughout carcinogenesis in the hamster cheek pouch model was achieved. OCT can clearly distinguish many histologic features such as epithelial and subepithelial change. 3-D images provide detailed structural information at any location, and may be viewed at any angle desired by the clinician. The appearance of structures imaged by OCT corresponded closely to histologic images. Given the ability to obtain high resolution images, flexible fiberoptic bronchoscopic compatibility, and in vivo noninvasive measurement, OCT has the potential to be- come a powerful method for early oral cancer detection.

Abstract: In this paper, a novel SAW RFID tag based on UWB chirp spread spectrum theory was proposed. The tag designation is in accordance with FCC standards of UWB wireless communications. The combination of UWB for SAW RFID has the characteristic of short delay due to large bandwidth and low energy required for the reader. Moreover, the encoding and detection for UWB SAW tag, which replaced the universally employed pulse position and on/off encoding methods in SAW tags with its central frequency of 2.45GHz and bandwidth of 82.5MHz, offers an effective way for multi-access SAW RFID tag system. Implementation of UWB CSS SAW RFID tag was demonstrated.

Abstract: With the development of modern measurement and control technology,the grating sensor is widely used in the measurement of displacement and angle in precise meterage domain. Limited by the grating scratching technology,the way to improve the measurement precision of grating sensor is using electronic technique to subdivision the grating signal. This paper mainly research on raster displacement detection system based on FPGA. As the usual raster sensor data collection system has many problem,A new raster sensor data collection system was found based on FPGA &USB. In this system,FPGA was used as main controller , and the USB was used for data transmission. A whole system hardware circuit design was given in this paper, including the FPGA processing of the raster sensor signal, and the USB circuit design

Abstract: In order to further improve the accuracy of the sonar image registration, a novel hybrid algorithm was proposed. It proposed the normalized mutual information as similar estimation, drawn on multi-resolution data structure based on wavelet transform, a low precision solution was solved by improved PSO algorithm, which has strong global search capability, firstly and then a high precision solution was acquired by Powell method, which has strong local search capability. The hybrid algorithm is effective to overcome the fall of local maximum mutual information function; it also improves solution’s precision. Since the hybrid algorithm is the initial point of pre-treatment, an effective solution to the Powell method dependence on the initial point. Experiments reveal that the hybrid algorithm is efficiency and effectiveness.

Abstract: Tunnel geological prediction is of great significance for the prediction of rock and instructing the tunnel constrution. By means of specifying the main principle of the tunnel geological prediction and introducting engineering project, the effectiveness of TSP geological prediction system in the application of tunnel geological prediction is analyzed and demonstrated, revealing the broad application prospects of this system in tunnel construction. This paper introduced the system of measuring point layout and data collection methods, pointing out the feasible method to improve the veracity of prediction results, and a few suggestions are given to tunnel construction, providing a guarantee for ensuring the safety of construction.

Abstract: Foreground extraction is a very important operation in the image processing of the computers. Its purpose is to extract the area that human beings are interested in from the complicated background, which is beneficial for the subsequent operations such as background exchange, changes of the perspective effect and image mosaicing and so on. However, it is actually an ill-posed problem to determine whether a pixel belongs to the foreground. It is usually hard to acquire an accurate solution from the initial image. Therefore, the foreground extraction algorithm generally needs the user interaction. This paper has put forward a kind of rapid foreground extraction algorithm with the user interaction form of Trimap. On the one hand, our Trimap is quite simple. The users are able to understand the influence of Trimap on the productive resultants visually. On the other hand, with the help of Trimap, we are able to lessen the area that needs to be calculated in a large degree, which can rapidly finish the work of foreground extraction.