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Spinal cord injury and cholelithiasis

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Hepatobiliary & Pancreatic Diseases International 2004年第4期3卷 595-598页

作者： Chang-Suo Xia, Ying-Qiu Han, Xuan-Ying Yang and Guang-Xiang Hong qingdao, china Department of Orthopaedics, Affiliated Hospital of Medical college , qingdao university, qingdao 266003 , china and Department of Orthopaedics, Union Hospital, Tongji Medical college, Huazhong university of science and technology, Wuhan 430030 , china Department of Orthopaedics Affiliated Hospital of Medical College Qingdao University Qingdao 266003 China. xcs_009@***

BACKGROUND: Spinal cord injury (SCI) is found to be related to increased prevalence of gallstones and acute acal- culous cholecystitis. In this study we assessed the prevalence of cholelithiasis in male patients with SCI and the correla- tion of cholelithiasis with age and weight of patients, level of injury, as well as severity and duration of SCI. METHODS: One hundred male SCI patients (58 patients rated ASIA A or B and 42 rated ASIA C or D) aged more than 20 years (average 46.5 years) suffered from a spinal cord injury for more than one year. One hundred male vo- lunteers served as controls without SCI and biliary diseases (age range 20-68 years; average 42.6 years). The two groups were subjected to ultrasonography of the gallbladder and biliary tract. RESULTS: The prevalence of cholelithiasis in the group of SCI patients and the control group was 26% and 10% re- spectively. Significant differences in the prevalence of cho- lelithiasis were found between the normal controls and SCI patients and between high- and low-level injury (P 0.05). CONCLUSIONS: SCI represents a major risk factor for the development of cholelithiasis, especially in patients with high-level injury. Cholelithiasis in SCI patients is not relat- ed to their age and weight, the severity of spinal lesion, and the duration of spinal cord injury.

关键词： spinal cord injury cholelithiasis gallstones risk factors

Interactive group decision making procedure based on uncertain multiplicative linguistic preference relations

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Journal of Systems Engineering and Electronics 2010年第3期21卷 408-415页

作者： Zeshui Xu1,2,1.college of Economics and Management,Southeast university,Nanjing 210096,P.R.china 2.Institute of sciences,university of science and technology of the PLA,Nanjing 210007,P.R.china college of Economics and Management Southeast University Nanjing 210096 P. R. China Institute of sciences University of Science and Technology of the PLA Nanjing 210007 P. R. China

Group decision making problems are investigated with uncertain multiplicative linguistic preference *** unbalanced multiplicative linguistic label set is introduced,which can be used by the experts to express their linguistic preference information over *** uncertain linguistic weighted geometric mean operator is utilized to aggregate all the individual uncertain multiplicative linguistic preference relations into a collective one,and then a simple approach is developed to determine the experts＇ weights by utilizing the consensus degrees among the individual uncertain multiplicative linguistic preference relations and the collective uncertain multiplicative linguistic preference ***,a practical interactive procedure for group decision making is proposed based on uncertain multiplicative linguistic preference relations,in which a possibility degree formula and a complementary matrix are used to rank the given ***,the proposed procedure is applied to solve the group decision making problem of a manufacturing company searching the best global supplier for one of its most critical parts used in assembling process.

关键词： group decision making uncertain multiplicative linguistic preference relations unbalanced multiplicative linguistic label set consensus degree interaction.

ANALYTICAL SOLUTION OF NONLINEAR BAROTROPIC VORTICITY EQUATION

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Journal of Hydrodynamics 2008年第4期20卷 530-535页

作者： WANG Yue-peng SHI Wei-hl college of Mathematics and Physics Nanjing University of Information Science and Technology Nangjing210044 China Jiangsu Key Laboratory of Meteorological Disaster Nangjing University of Information Science and Technology Nangjing 210044 China Department of Mathematics Shanghai University Shanghai 200072 China

The C^k （k ≥ 3） stability of nonlinear barotropic vorticity equation was proved. The necessary and sufficient conditions for the initial value problem to be well-posed were presented. Under the conditions of well-p... 详细信息

关键词： nonlinear barotropic vorticity equation stability well-posedness analytical solution

A new method of ionospheric-free hybrid differential positioning based on a double-antenna CAPS receiver

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science china(Physics,Mechanics & Astronomy) 2009年第3期52卷 368-375页

作者： GUO JinYun1,2, HAN YanBen1 & CHANG XiaoTao3 1 National Astronomical Observatories, Chinese Academy of sciences, Beijing 100012, china 2 college of Geodesy and Geomatics, Shandong university of science and technology, qingdao 266510, china 3 Chinese Academy of Surveying and Mapping, Beijing 100039, china National Astronomical Observatories Chinese Academy of Sciences Beijing China college of Geodesy and Geomatics Shandong University of Science and Technology Qingdao China Chinese Academy of Surveying and Mapping Beijing China

Chinese Area Positioning System (CAPS) is a transmitted satellite navigation system moved by the Chinese Academy of sciences. Three basic modes of navigation and positioning with CAPS are given, and then a comparative analysis is made in this paper. In terms of the principle that the ionospheric delay is at an inverse ratio to the frequency square, a new ionospheric-free positioning method based on a double-antenna CAPS receiver is put forward. Then the hybrid differential observations and the solving equations and algorithms for one epoch and multi epochs are deduced according to the basic principle of the method. The method may remove the global errors in signal emission, propagation, transmission and receiving (e.g., ionospheric delay, hardware delay, and clock error). So it is very convenient for the single-epoch solution and multi-epoch navigation and positioning, and may efficiently improve the precision of real time CAPS navigation. Furthermore, the method can be used not only for the geometric orbit determination of CAPS GEO and IGSO satellites and the navigation and positioning, but also for the estimation of the tropospheric zenith delay, which is useful for the study of water vapor changes in the atmosphere. Polynomials are used in this method to express the tropospheric zenith delay and CAPS satellite orbits within the limited time interval, which reduces the num- ber of unknown parameters and thus speeds the computation.

关键词： Chinese Area Positioning System (CAPS) ionospheric-free linear combination double-antenna receiver hybrid differential positioning method

Chaos correlation optical time domain reflectometry

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science china(information sciences) 2010年第2期53卷 398-404页

作者： WANG AnBang & WANG YunCai Department of Physics, college of science, Taiyuan university of technology, Taiyuan 030024, china Department of Physics College of Science Taiyuan University of Technology

We propose a novel correlation optical time domain reflectometry (C-OTDR) of using broadband chaotic light. This reflectometry has the advantage over the conventional OTDR and the pseudorandom signal C-OTDR in range-independent spatial resolution. We employ a laser diode with feedback from a long fiber ring cavity as the source of chaotic probe light. Experimental and numerical studies show that the chaotic light has broad and flat spectrum, and excellent correlation properties. Using this broadband chaotic laser, we experimentally demonstrate the proposed chaos C-OTDR for locating the fiber reflection events, and analyze the spatial resolution and dynamic range. The results show that the chaos C-OTDR can realize a range-independent resolution of 6 cm and its dynamic range is at least 25 km.

关键词： optical time domain reflectometry chaos laser diode optical feedback

Architecture design of low-power motion estimation based on DHS-NPDS for H.264/AVC

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science china(information sciences) 2012年第10期55卷 2234-2242页

作者： CHEN YunBi 1,LI ZhengDong 2,GUO Li 1,XIE JinSheng 1 & ZHAO Long 1 1 Department of Electronic science and technology,university of science and technology of china,Hefei 230027,china 2 Staff room of Electronic and technology,Chongqing Communication college,Chongqing 400035,china Department of Electronic science and technology University of Science and Technology of China Hefei China Staff room of Electronic and technology Chongqing Communication College Chongqing China

A novel architecture of motion estimation(ME) based on improved normalized partial distortion search is proposed to meet three primary requirements for real-time video encoding,which are low-power,lowbandwidth and high area utilization *** ME engine supports both normalized partial distortion search and adaptive search window *** former can reduce the computational complexity of ME to save power and area;the latter can avoid unnecessary accessing the external memory to lower the data *** proposed engine has been implemented with UMC 90nm CMOS *** implementation results show that,compared with traditional engines,the engine can achieve significant improvements of the hardware efficiency and the power efficiency respectively with a little throughput compromise.

关键词： partial distortion search adaptive search range low-power low-bandwidth pipeline VLSI

Optimal design study of high order FIR digital filters based on neural network algorithm

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Journal of Systems Engineering and Electronics 2004年第2期15卷 115-119,130页

作者： Wang Xiaohua & He Yigangcollege of Electrical and information Engineering, Hunan university, Changsha 410082, P. R. china college of Electrical and information Engineering, Changsha university of science and technology,Changsha 410077, P. R. china college of Electrical and information Engineering Hunan University Changsha 410082 P. R. China college of Electrical and information Engineering Changsha University of Science and Technology Changsha 410077 P. R. China

An optimal design approach of high order FIR digital filter is developed based on the algorithm of neural networks with cosine basis function . The main idea is to minimize the sum of the square errors between the amplitude response of the desired FIR filter and that of the designed by training the weights of neural networks, then obtains the impulse response of FIR digital filter . The convergence theorem of the neural networks algorithm is presented and proved, and the optimal design method is introduced by designing four kinds of FIR digital filters , i.e., low-pass, high-pass, bandpass , and band-stop FIR digital filter. The results of the amplitude responses show that attenuation in stop-bands is more than 60 dB with no ripple and pulse existing in pass-bands, and cutoff frequency of passband and stop-band is easily controlled precisely .The presented optimal design approach of high order FIR digital filter is significantly effective.

关键词： high order FIR digital filters amplitude-frequency response neural network convergence theorem optimal design.

Perfect reconstruction image modulation based on BEMD and quaternionic analytic signals

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science china(information sciences) 2011年第12期54卷 2622-2634页

作者： QIAO LiHong 1 , NIU KaiFu 2 , WANG Ning 2 & PENG LiZhong 2 1 college of information science and Engineering, Henan university of technology, Zhengzhou 450001, china 2 School of Mathematical sciences, Peking university, Beijing 100871, china college of information science and Engineering Henan University of Technology School of Mathematical sciences Peking University

Image modulation represents image by meaningful characters such as image instantaneous amplitude and instantaneous frequency. A perfect reconstruction image modulation method is proposed. In detail, the bidimensional empirical mode decomposition (BEMD) is first improved to adaptively decompose image into monocomponents. Then by the quaternionic analytic method, suitable analytic signals is acquired. A new polar form is further proposed to modulate images, then seven characters are derived including instantaneous amplitude and instantaneous frequencies. We demonstrate the techniques on both synthetic and natural images, depict the needle program of the estimated frequencies and obtain the reconstructions that are the same with the original images. The applications in image segmentation and separation establish the validity of characterizing images of this type as sums of locally narrow band modulated components.

关键词： perfect reconstruction image modulation AM-FM representation BEMD quaternionic analytic signals

Cryopreservation of amphioxus (Branchiostoma belcheri) spermatozoa

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Acta Oceanologica Sinica 2009年第2期28卷 96-102页

作者： XU Yuyan ZHANG Shicui VERAPONG Vuthiphandchai SUBUNTITH Nimrat college of Food science and Engineering Ocean University of China Qingdao 266003 China college of Marine Biology Ocean University of China Qingdao 266003 China Department of Aquatic science Burapha University Chonburi 20131 Thailand Department of Microbiology and Environmental science Program Faculty of Science Burapha University Chonburi 20131 Thailand

Amphioxus, Branchiostoma belcheri, a closest relative of vertebrates, is at a high risk of extinction due to a combination of low effective population size, altered native habitats and environmental pollution, yet little is known about cryopreservation of its gametes. This study deals with the cryopreservation of amphioxus senlen. The main findings are that （1） the extender of Yao et al. is the best one among the four extenders examined; （2） the appropriate ratio of semen to extender of Yao et al. plus cryoprotectant is from 1：5 to 1：7; （3） dimethyl sulfoxide （DMSO） and methanol are the better cryoprotectants than glycerol, with DMSO giving the best results; （4） the eggs fertilized with post-thaw spermatozoa are capable of developing to at least hatching stage, and the highest hatching rate is （12.4±3.0）%. This is the first report on freezing and thawing of amphioxus spermatozoa, providing a simple and practical protocol for cryopreservation of amphioxus spermatozoa and laying a foundation for safeguarding this endangered species.

关键词： amphioxus Branehiostoma beleheri cryopreservation spermatozoa motility