基于动态二维图像序列的三维步态识别方法     

王运成 《科技通报》2013,(10)

针对在当前二维步态识别系统中,受到人体走路姿势中的特征重叠的影响,不能很好的解决信息丢失问题。而三维识别也面临着技术要求复杂,对设备角度要求高的问题,本文提出了一种基于动态二维图像序列的三维步态识别方法。利用摄像机采集单帧步态图像序列,通过对单帧连续通信进行坐标动态转换,对特征矩阵进行有效的三维转化,计算三维特征数据,提取三维人体单帧二维图像转化的特征,进行步态识别。结果表明,本方法无需复杂的设备,能够解决特征丢失问题,识别准确度有了较好的改善。  相似文献   

一种C2C商铺可信度混合模糊综合评价方法     

罗新星  张晓鹏 《软科学》2013,27(2):136-139,144

针对C2C中商品排序的可信问题提出一种基于商铺可信度的混合模糊综合评价方法:采用模糊AHP方法进行指标的权重确定,结合模糊TOPSIS方法对商铺的可信度进行评估。通过算例验证了该方法的适用性。  相似文献   

肌酸补充和电刺激对C2C12肌管糖摄入的效应及机制研究     

赵秀峰  徐晓阳  闫旭洁 《北京体育大学学报》2013,36(2):48-54

目的:旨在研究肌酸补充(CS)和电刺激(ES)对C2C12肌管葡萄糖摄取相关通路蛋白含量和基因表达的影响,阐明肌酸对GLUT4调节的相关信号通路,并讨论CS是否对ES具有叠加效应,为肌酸提高耐力水平提供新的理论依据。研究方法:0.5mM和2 mM浓度的肌酸孵育分化5 d的肌管48h,然后电刺激(15V,30ms,3Hz)共分化7d的肌管120 min。结果:ES引起AMPK-α2和GLUT4 mRNA表达及GLUT4蛋白含量显著增加(P<0.05),糖原显著下降(P<0.05)。不同浓度的CS没有引起AMPK-α2 mRNA表达变化,却使得GLUT4 mRNA和蛋白含量显著增加(P<0.05),糖原含量也无显著性增加(P>0.05)。ES+CS组与C组和同浓度CS组相比,明显上调AMPK-α2 mRNA和GLUT4 mRNA表达及GLUT4蛋白含量(P<0.05)。结论:1)15V,30ms,3Hz的刺激参数,ES120min没有引起细胞膜明显损伤,是研究耐力运动对肌肉糖代谢影响的适合参数。2)ES能通过AMPK途径增加肌管糖摄入和糖转运。3)单纯CS对肌管糖含量没影响,肌酸或许是通过AMPK非依赖性通路调节糖摄入。4)CS对ES对糖摄入的调节具有叠加效应。  相似文献   

在军事训练学下自设军事体育学二级学科的必要性论证     

柯杰兵  肖庚庆  吴倩倩  陈啸 《军事体育进修学院学报》2013,(1):41-44

在新的国家《学位授予和人才培养学科目录(2011年)》中,军事体育学无法被列入独立的二级学科;而拥有军事训练学硕士学位授权一级学科的研究生培养单位可以自设目录外二级学科。本文在对军事体育及军事体育学概念界定的基础上,对军事体育学的发展概况、军事体育学的作用与地位、军事体育学与相关二级学科的关系进行了梳理,阐述在军事训练学下自设军事体育学二级学科的必要性。  相似文献   

BD-2/GPS组合导航系统选星算法及定位分析   总被引：1，自引：0，他引：1  

应士君  李金金  刘卫  邱烺 《上海海事大学学报》2013,34(2):1-4

为解决组合导航系统定位精度与快速定位之间的矛盾,提出一种新的选星算法.该方法将可见卫星仰角与遗传算法相结合,以几何精度因子(GDOP)计算模型作为遗传算法中判断解优劣的适应度函数,从而达到快速定位的效果.将应用该方法所得的GDOP和算法运行时间与应用最佳GDOP算法计算所得的相应结果进行对比,发现采用该方法得到的GDOP接近最优值,而且选星算法计算时间减少.实验数据分析证明该方法在实时性和可行性方面的优越性.  相似文献   

船舶烟气海水脱硫的模拟和设计   总被引：1，自引：0，他引：1  

马义平  许乐平  宿鹏浩  杨开亮 《上海海事大学学报》2013,34(2):41-45

为研究船舶烟气海水脱硫过程中各个参数(烟气温度、SO2分压强、CO2分压强、海水温度、液气比、海水碱度)对脱硫效率和脱硫后海水pH值的影响,运用Aspen Plus V7.2对脱硫过程进行模拟.模拟结果表明:烟气温度和CO2分压强对脱硫效率和脱硫后饱和海水的pH值影响较小;SO2分压强、液气比、海水温度和碱度对脱硫效率和脱硫后饱和海水的pH值影响较大;随着SO2分压强的降低和海水碱度的增加,脱硫效率和脱硫后饱和海水的pH值都增加;随着海水温度的降低和液气比的增加,脱硫效率增加,但脱硫后饱和海水的pH值先减小再增加;脱硫后海水的pH值一般在2.6 ～3.0之间.对脱硫后海水的实验研究表明,实验结果与模拟结果较吻合.  相似文献   

p2p僵尸网络及检测     

孙玉 《安徽职业技术学院学报》2013,12(2):4-6

随着网络逐步融入人们的生活,网络安全形势变得越来越复杂,僵尸网络变得越来越危险,但人们尚未认识到僵尸网络特别是p2p僵尸网络的危害。针对上述情况,文章对僵尸网络的现状和危害进行了较为系统的分析,并提出了一种基于网络流量基本检测方法,对P2P僵尸网络未来的发展进行了预测。  相似文献   

Prenatal programming of sporting success: Associations of digit ratio (2D:4D), a putative marker for prenatal androgen action,with world rankings in female fencers     

Raúl Bescós  Marc Esteve  Jordi Porta  Mercè Mateu  Alfredo Irurtia  Martin Voracek 《Journal of sports sciences》2013,31(6):625-632

Abstract

Associations of the second-to-fourth digit ratio (2D:4D), a putative marker for prenatal androgen action, and of absolute finger length, a putative marker for pubertal–adolescent androgen action, with sport performance were examined in a multinational sample of 87 world-class women épée fencers. Lower (masculinized) digit ratios correlated, although not significantly so, with better current and highest past world rankings. These correlations were significant for right-hand 2D:4D with controls for the most salient factors for 2D:4D (ethnicity) and world rankings (years of international experience, height, and weight). Longer (masculinized) fingers correlated strongly with better current and highest past world rankings; these correlations became insignificant with the same controls. Replicating previous evidence for fencers, left-handedness was much more prevalent in this sample (21%) than in the female general population, and left-handers had somewhat, but not significantly so, lower 2D:4D as well as better world rankings than right-handers. These findings extend related evidence suggestive of prenatal programming of aptitude across a variety of sports, especially running and soccer. Some known extragenital effects of prenatal testosterone that contribute to the development of efficient cardiovascular systems, good visuospatial abilities, physical endurance and speed, and to the propensity for rough-and-tumble play, apparently promote sporting success in adult life.  相似文献   

An Analysis of the Validity of the Three-Mile Run as a Field Test of Aerobic Capacity in College Males     

Allen Jackson EdD    Roland Schick   《Research quarterly for exercise and sport》2013,84(3):233-237

Abstract

The purpose of the present investigation was to examine the concurrent and construct validity of the three-mile (4.83 km) run as afield test of aerobic capacity. Subjects included 109 college-aged males whose three-mile run time (M = 1310.31 ± 184.48 s) was measured. Fifty of the subjects were given a maximal treadmill stress test, and their peak oxygen consumption (VO₂peak) (M = 54.23 ± 7.08 ml.kg^?1.min^?1) was measured. The three-mile run was conducted on an outdoor 0.25 mile (0.425 km) track, and split tunes were recorded each 110 yds (100.32 m) for the first and last laps and total time was recorded for laps 2 through 11. The correlation coefficient between the run time and VO₂peak was -.58, indicating only moderate concurrent validity for the run as afield test for aerobic capacity. A factor analysis conducted on the split time data revealed a three-factor structure of a stable pace phase, an initial sprint, and a final sprint with the stable pace factor accounting for most of the common factor variance (69%). The three-mile run time was used to discriminate successfully between two known groups of subjects in aerobic capacity. These data provide a degree of support for the construct validity of the three-mile run as afield test of aerobic capacity.  相似文献   

Effect of Optimized and Standard Cycle Ergometry on VO2max in Trained Cyclists and Runners     

Jonathan C. Beasley  Sharon A. Plowman  Bo Fernhall 《Research quarterly for exercise and sport》2013,84(4):373-378

Abstract

This study contrasted prepractice modeling with either the perceptual component (perceptual modeling) or the motor component (movement pattern) of a coincident-timing task to determine whether experiencing the modalities singly or in combination enhanced timing performance on initiation of active practice. The motor component was a 60-cm right-to-left arm movement coincident with the illumination of lights on a Bassin timer runway to displace a barrier as the final runway light was illuminated. Four groups were compared (n = 12 per group). A perceptual modeling group passively viewed stimulus runway lights prior to attempting the task. A motoric modeling group viewed a videotape prior to practice of a model performing the motor component of the skill with zero timing error. A perceptual modeling plus motoric modeling group experienced both modeling modalities prior to performance. Finally, a no modeling group simply initiated practice on the task without modeling. Results indicated that the groups experiencing perceptual modeling initiated practice with significantly less average timing error and variability. Thus, perceptual modeling appeared to be at least as important as motoric modeling as a source of prepractice information to make available to a learner to optimize coincident-timing skill acquisition.  相似文献