基于协同表示的目标跟踪算法

提出一种基于协同表示的新的目标跟踪算法.在贝叶斯框架下,采用基于重构误差的观测似然函数和考虑遮挡的模型更新机制设计一个鲁棒的跟踪器.用l₁范数来建模重构误差以更好地容忍奇异值,同时用协同表示对编码系数进行约束.实验结果表明,和其他算法相比,本文算法能够战胜遮挡、尺度变化、光照变化、背景混乱等干扰因素,具有较高的准确度和鲁棒性.     

Tensiomyographical responses to accelerometer loads in female collegiate basketball players

The purpose of the present study was to characterise the relationship between relative versus absolute internal and external loads in collegiate basketball players throughout the course of a season. Five Division I basketball players wore triaxial accelerometers throughout the 2015–2016 season and were tensiomyographically assessed weekly. One-way repeated-measure analysis of variance (RM ANOVA) with least-significant-difference (LSD) pairwise comparisons was used to determine which absolute weekly loads were different across the season. Cohen’s d was used to supplement the determination of meaningful relative load changes. Overall RM ANOVA models suggest absolute external load differences occurred (PlayerLoad? F = 17.63; IMA? F = 31.63). Two-way RM ANOVA models revealed main effect differences were revealed between muscle groups for Tc (F = 9.11) and Dm (F = 3.25). Meaningful relative load changes between weeks were observed for both external and internal. The present study observed that tensiomyography utilised as a tool to monitor internal load may be more suitable for detecting fatigue from relative external load changes versus absolute load attained. Limiting weekly training volume changes to ≤10% may maintain appropriate adaptation. Mediolateral plane IMA? and adductor longus muscle group may be pertinent metrics when monitoring female collegiate basketball athletes.     

基于TSM模型的感应电机有限时间跟踪控制

根据变结构控制理论提出了一种新的设计方法——有限时间切换控制。在控制器设计中利用中继切换控制使系统在给定的当前控制律的作用下运行到某一特定状态（或某一特定区域）后,控制律被切换为有限时间收敛的终端滑模控制器,并使得系统在有限时间内达到平衡状态。有限时间跟踪控制器的设计保证了闭环系统所有信号的有界性和平衡点的全局稳定性,以及系统在有限时间内精确地跟踪给定的参考信号,仿真结果说明该控制策略的有效性。     

大学生身体素质变化状况的追踪研究

采用数理统计、问卷调查、文献资料等方法, 对我院９５ 级随机抽样所得的３９０ 名学生的有关身体素质指标进行为斯四年的追踪研究。结果显示四年中各指标的变化曲线为 “单峰型”, 二年级为最高, 三、四年级明显下降。本文就造成此种变化的原因进行分析, 提出相应的建议和措施。     

位置服务中基于假数据的轨迹隐私度量方法

随着各种各样移动设备的普及,轨迹隐私保护问题变得日益严峻,作为轨迹隐私保护的一个方向,国内外开始慢慢建立起一些较为成熟的度量机制,常见的有基于k-匿名保护机制的隐私度量方法、基于跟踪的度量方法、针对特定匿名系统的轨迹隐私度量方法等。文章在现有研究的基础上构建了了一种基于假数据轨迹隐私保护技术的隐私度量标准,从发布假轨迹上点之间的关联性、发布数据所包含信息的精确度以及攻击者所拥有背景知识多少三个方面进行轨迹隐私保护度的全面度量。     

The use of spatial manipulation to examine goalkeepers’ anticipation

This study investigated whether anticipation and search strategies of goalkeepers are influenced by temporally and spatially manipulated video of a penalty. Participants were clustered into three groups depending on skill: goalkeepers (n = 17), field players (n = 20) and control group (n = 20). An eye tracker was worn whilst watching 40 videos of a striker kicking to four corners of a goal in random order. All 40 videos were temporally occluded at foot-to-ball contact, and the non-kicking leg of 20 videos was spatially manipulated. Results showed that goalkeepers had significantly better predictions than the two groups with no differences between the two testing conditions. According to effect size, the percentage of fixation location and viewing time of the kicking leg and ball were greater for the goalkeepers and field players group than the control group irrespective of testing conditions. The fixations on the kicking leg and ball in conjunction with comparable predictions between spatially manipulated and control conditions suggest that goalkeepers may not rely on the non-kicking leg. Furthermore, goalkeepers appear to use a global perceptual approach by anchoring on a distal fixation point/s of the penalty taker whilst using peripheral vision to obtain additional information.     

基于单片机的智能小车的设计与实现

介绍了一种以 STC89C52单片机为控制核心的智能小车的设计。设计由电机驱动模块、超声波测距模块、循迹模块、红外和语音模块组成,拟实现一个无人驾驶公交车系统。通过 C 语言编程实现小车的前进倒退、转向行驶、自动循迹导航、超声波测距,并根据检测障碍物距离调整速度、红外遥控定点播报功能,实现智能控制,达到设计目标。该系统电路结构简单、功耗低、稳定性高,具有一定实际应用价值。     

考虑遮挡的视频车辆跟踪

为了对遮挡情况下的运动车辆进行跟踪,提出一种基于分块的车辆跟踪算法。该算法将目标车辆以可重叠的方式划分为若干大小一致的子块。在分块的基础上估计所有子块的运动矢量,检测噪声运动矢量并进行调整,以减少运动矢量估计的误差,然后对子块进行移位以实现车辆跟踪。为了处理车辆间的遮挡现象建立了马尔可夫随机场描述子块之间的关系,利用欧氏距离定义块的邻域,并基于块的直方图构建能量函数,最后利用模拟退火法对能量函数进行优化,以对遮挡区域进行分割。实验结果表明,该算法能够对遮挡车辆进行准确跟踪。     

The eye-mind of processing written feedback: Unraveling how students read and use feedback for revision

This research aims to promote our understanding of feedback engagement processes in writing tasks using a combination of online and offline measures, including eye-tracking, thinking-aloud, and text-analyses. Study 1 explored how sixteen students read, evaluate, and use feedback for revision. Results revealed three feedback processing strategies: (1) superficial processing (n = 6), which is characterized by reading feedback in a linear way, without critically rereading or revising the text, (2) local processing (n = 6) in which students switched between reading the comments and the commented text, and (3) deep processing (n = 4) in which students integrated the feedback with both commented and uncommented parts of the text and made more substantial revisions. In Study 2, we investigated the local and deep feedback reading strategy in more detail with 41 students using a within-subject design with different types of feedback. Results demonstrated the same strategies among students, but also that the focus of feedback affected students' revision behavior, above and beyond an individual feedback processing strategy. This finding is in line with previous research that emphasized the effects of feedback characteristics on students’ use of feedback. By triangulating various process measures, this research is one of the first that provides empirical evidence for different feedback processing strategies among students. These novel insights in individual feedback engagement processing can be used to extend and refine current theories on how, when, and why feedback works and for whom.     

渐进运动对恶化肺部真菌感染的斑点追踪治疗

目的:研究渐进运动对恶化性肺部真菌感染的感染过程,分析斑点追踪指导治疗方法对肺部真菌感染恶化过程的临床指导。方法:以某运动疾病康复治疗医院从2014年1月到2014年3月收治的85例肺部真菌感染患者为分析对象,对患者的肺部真菌感染过程进行全程监控,对恶化过程每天进行观察记录,综合提取肺部真菌感染的斑点分布特性与斑点运动特性,比较伊曲康唑、霉素B脂质体、氟康唑三种药物代谢过程的斑点特性,给出真菌感染度及恶化趋势,最后采用相应药物进行治疗。结果:不同感染和恶化程度的肺部真菌感染斑点分布复杂,运动特性各异,随着真菌感染恶化加剧,斑点分布更加随机化,且运动特性明显加剧。结论:渐进运动对渐进恶化性的肺部真菌感染的斑点追踪具有很好的临床参考价值,可以依据斑点特性对肺部真菌感染恶化特性做出准确预测。