Applied Mechanics and Materials Vols. 416-417

Abstract: Ultrasound imaging, as one of the four most important medical imaging technologies (ultrasound, CT, MRI, and isotope scanning), has become an indispensable important part of the clinical medicine after the development of more than half a century. Medical ultrasound imaging, by relying on its advantages such as real-time, nondestructive, no radiation, and cheap price, has constantly received attention from people. More accurate diagnosis and treatment, and more authoritative protection are continuously provided by the medical ultrasound imaging technology for clinical diseases. In this paper, starting from the basic ultrasonic wave, the application of ultrasound in medicine, medical ultrasonic imaging technology and classification, and the current ultrasonic equipments applied in medical imaging are introduced. The medical equipment use units and personnel can provide better health service for human beings as long as the equipments are better known and utilized.Ultrasonic and its application in medicine

Abstract: In this paper, the development characteristics and application principle of multispectral image technology are mainly introduced, the current research of multispectral image technology as well as its application principle in foot testing are comprehensively analyzed, and then its application to current food testing and the specific research dynamics are discussed, and also the latest research dynamics and application of this technology in foreign countries are presented, aiming at providing a good basis for the development of China's food testing technology and promoting this technology to be better applied in China.

Abstract: This paper presents and implements an automatic roaming and fast virtual endoscopic neurosurgery system for transsexual approach, which can be compatible with the fiber-optic endoscopic transnasal approach in the skull base surgery, and accurately locate the position and their mutual relations among the lesions, tumors and surrounding vital anatomical structures. The system uses a multithreaded RayCasting volume-rendering algorithm based on the graphics processor (GPU). It reconstructs the nasal three-dimensional structure in the skull base surgery, and optimizes the centerline extraction that can be carried out automatically. In real-time display, it improves the translucent rendering optical model, taking into account lighting model important parameter - the image gradient translucent degree of non-linear effects, and can fully display the skull surface and internal implied the interface and internal details.

Abstract: Based on non-precision observation, it researches the inversion problem with morbid equality constraints. And according to the pathological problems exist for the coefficient matrix and the constraint matrix, and it suggests the ridge estimation of the double-k type derived Ridge to determine these parameters. The results show that a variety of programs and double k ridge estimate not only removes the constraint matrix morbid adverse effects, but also can better overcome the master model morbidity and constraint matrix caused by the presence of instability, which is a good estimate.

Abstract: In this paper, the GM estimation is integrated with ridge estimation, principal component estimation and LIU estimation, resulting in a new class of robust unbiased estimation, and given the appropriate method of calculating. The example shows that such a new biased estimate is not only resistant to the interference of design matrix multicollinearity, but also withstands the adverse effects of outliers and high leverage points. They are really better than the LS estimation, unbiased estimation, robust M estimation and robust M-type biased estimation.

Abstract: This paper proposes a general construction method of biorthogonal wavelet based on perfect reconstruction condition. With the certain filter length and vanishing moment, it can educe the biorthogonal wavelets filter coefficient by solving equations. Thereafter, this method constructs 5/3 wavelet, CDF9/7 wavelet and 9/7 wavelet with simple coefficient, which applies well to hardware, for JPEG2000.

Abstract: To decrease the computational complexity and improve the performance of channel estimation for underwater acoustic (UWA) sparse multipath channels, a sparse least square (SLS) channel estimation algorithm is proposed. The proposed algorithm combines advantages of both generalized akaike information criterion (GAIC) estimation and estimation using effective order of channel impulse response (CIR). Known pilot data is used to estimate effective order of CIR and then the position of taps of CIR is estimated. In order to adapt to the environment with low SNR and reduce the dimension of signal space, adaptive threshold is also used. Simulation results indicate that the proposed method has good performance of channel estimation and low complexity.

Abstract: A traditional Radio Frequency Identification (RFID) system only resolves collisions of multiple tags on the Medium Access Control (MAC) layer, discarding the signals of the physical layer. Recently different groups started to pay attention on slots with colliding RFID tag signals, and coping with collisions on the physical layer, however. We proposes that using C-means clustering algorithm to analyze signal constellations of two colliding tags responses, to recovery from collisions of two tags on the physical layer and decoding their ID information successfully. This design uses low frequency (LF) 125k Hz carrier wave, and is also suitable for high frequency (HF) communication situation. Additionally, an error performance analysis with different SNR is shown. Based on performance simulations results, we demonstrate this approach can resolve collisions of two tags effectively in a slot on the physical layer and get a lower error probability.

Abstract: According to the independence of the base station, the basic characteristics of the base station are analyzed, and a heat transfer model of communication base station enclosing structure is constructed, and the change of the temperature data in the base station is simulated using computer, and also all program module design flows of computer simulation are provided. Through the comparison between the result of field test on a typical base station and the simulation data, it is learnt that the temperature data simulated in the heat transfer model of the base station enclosing structure is similar to the average temperature within the measured base station.

Abstract: As the digital acquisition system is featured by increasingly higher technical targets and more complicated applicable conditions, the traditional digital oscilloscope has become incapable of meeting the requirements of real-time processing of sampled data and waveform display on one hand, and unqualified for field test in hard risky conditions on the other. This paper aims for comprehensively enhancing the digital oscilloscopes data processing, image display, human-machine interface and portable adaptability. To that end, it approaches the system composition of improved oscilloscope, and renders a chance to wirelessly connect the oscilloscope with any of the Smart Handheld Devices with Android operation system through the added wireless data interactive channel, which forms a smart handheld wireless oscilloscope. Such oscilloscope adopts the divisional coordination between data acquisition system and Smart Handheld Device to greatly improve data processing, waveform display and HMI, and realize wireless operation of remote test as a result.