基于混沌加密和HVS在数字水印算法中的应用

针对混沌系统和人类视觉特性改进一种鲁棒性数字水印算法。原始图像经过离散小波变换提取子带系数,二值灰度数字水印图像信号在嵌入时经过Logistic混沌映射预处理,结合人眼视觉特性,水印图像嵌入到重要的子带系数中,实验证明该方案对常见的图像处理如噪声、剪切、旋转等攻击具有很好的鲁棒性。     

高职高专学生健康素质现状和对策研究

以社会学的研究视角和研究方法,研究了高职高专学生的健康素质,具有统一性、实用性、创新性等特点。结果表明：铁岭师专高职与同一年级的学生健康素质的总体现状。男性低于女性、城镇男生低于乡村。建议：通过对体育课程、学生体质健康标准的测定等方式探索适合学生健康状况的干预对策。     

Coordination variability and skill development in expert triple jumpers

The aim of this study was to examine the influence of skill of expert triple jumpers on the coordination variability of lower extremity intra-limb couplings. In contrast to the traditional motor learning perspective, we hypothesized that as skill and thus performance increases, movement coordination variability will also increase. Three-dimensional kinematic and ground reaction force data were collected during the hop-step transition phase of the triple jump. Relative motion plots and a modified vector coding technique were used to quantify the coordination variability across the trials. The results were consistent with a U-shaped curve, representing coordination variability, as skill increases. The high coordination variability in less skilled athletes is present while the appropriate characteristics defining the movement coordination patterns are acquired. This coordination variability may not be beneficial to performance. As the refinement of these characteristics is achieved, coordination variability decreases, resulting in a more consistent or regulated performance. In the final stages of developing a skilled performance, a functional variability is accessed that brings flexibility to the system allowing it to cope with perturbations. This study highlights the need to address the learning effect when analysing coordination variability from a dynamical systems perspective.     

高校体育教学的现状分析和课程改革思路

目前传统的体育课程教学在教学内容、课程体系、教育质量评价和教学方法等方面仍存在不足,基于此,在多年的教学中,我们对现代化体育教学模式进行了探讨,在研究中发现,为了进一步改变陈旧的教学方法,应不断丰富教学内容,及时调整体育项目丰富选修教学内容,增强教学可接受性培养终身体育思想,构建多元化评价体系,采用计算机多媒体技术辅助教学,体现体育教学的现代化,积极有效地推进新一轮体育课程改革。     

The role of upper torso and pelvis rotation in driving performance during the golf swing

While the role of the upper torso and pelvis in driving performance is anecdotally appreciated by golf instructors, their actual biomechanical role is unclear. The aims of this study were to describe upper torso and pelvis rotation and velocity during the golf swing and determine their role in ball velocity. One hundred recreational golfers underwent a biomechanical golf swing analysis using their own driver. Upper torso and pelvic rotation and velocity, and torso-pelvic separation and velocity, were measured for each swing. Ball velocity was assessed with a golf launch monitor. Group differences (groups based on ball velocity) and moderate relationships (r > or = 0.50; P < 0.001) were observed between an increase in ball velocity and the following variables: increased torso-pelvic separation at the top of the swing, maximum torso-pelvic separation, maximum upper torso rotation velocity, upper torso rotational velocity at lead arm parallel and last 40 ms before impact, maximum torso-pelvic separation velocity and torso-pelvic separation velocity at both lead arm parallel and at the last 40 ms before impact. Torso-pelvic separation contributes to greater upper torso rotation velocity and torso-pelvic separation velocity during the downswing, ultimately contributing to greater ball velocity. Golf instructors can consider increasing ball velocity by maximizing separation between the upper torso and pelvis at the top of and initiation of the downswing.     

分层分组合作教学方式在篮球教学中的实验研究

运用实验对照法和统计分析法,将分层分组合作教学方式运用在高校篮球专选班的教学中,结果表明,分层分组合作教学方式能有效提高学生的技战术水平,增强学生的自信心和成就感,充分体现了学生的主体地位和教师的主导作用,同时培养学生的团队合作精神。     

论武术竞赛中比赛服装的要求及其作用

随着武术竞赛活动日趋增多,为了在世界范围内更快更好地推动武术运动的发展,不仅需要提高武术裁判员的业务水平和运动员的竞技能力,还要注重武术比赛服装的选择。文章分析了现代武术竞赛中比赛服装的流行趋势,研究了武术竞赛中对服装的要求以及比赛服装在武术竞赛中的作用,旨在更好地促进武术运动的发展。     

论英语学习自主性在不同教育形式中的作用

随着科学技术的飞速发展和信息化时代的到来,要求人们必须树立终身学习的思想。本文针对我国不同教育形式并存的现象,主要探讨了自主学习在不同教育形式中的作用及英语学习自主能力的培养模式。