网络拓扑测量分析与研究

对现有的网络拓扑测量方法进行研究,就校园网的实际情况设计出一个网络拓扑测量系统,并对其三个组成部分进行详细说明．重点讨论了如何利用SNMP＋ICMP协议获取网络层拓扑节点及其连接关系以自动构造网络拓扑图,并给出实现算法．实验表明该方法在网络拓扑测量中是有效快速的．     

一种磁耦合谐振线圈结构阻抗测量装置设计

提出了一种基于矢量伏安法测量原理的便携式阻抗测量装置,并分析了磁耦合谐振式无线电能传输中耦合线圈结构阻抗测量电路的设计原理,通过单片机系统控制AD5933阻抗转换器测量待测谐振耦合结构的阻抗,利用串口通讯协议实现LabVIEW软件和单片机系统的相互通讯。实验结果表明,耦合线圈工作在谐振态下,阻抗测量值与理论阻抗值相对误差为2%,成本较低,便于携带,能够满足大部分耦合线圈设计需求。     

基于机器视觉的电机端盖孔直径的在线测量

构建了基于机器视觉的电机端盖孔直径尺寸的在线测量系统,利用halcon软件包对CCD工业相机参数标定,处理了电机端盖图像,通过边缘特征提取,计算电机端盖孔直径尺寸,与千分尺测量结果对比,验证了本文提出的电机端盖孔直径视觉测量方法能够满足生产需要。     

Classification of obesity varies between body mass index and direct measures of body fat in boys and girls of Asian and European ancestry

Body mass index is a common proxy for proportion of body fat. However, body mass index may not classify youth similarly across ages and ethnicities. We used sex- and ethnic-specific receiver operating characteristic curves to determine how obesity classifications compared between body mass index and dual energy x-ray absorptiometry-based body fat percent. Male and female participants 9- to 18-years-old (n = 944; 487 female) were measured 1 to 13 times (1999–2012; 4,411 observations). Body mass index identified < 50% of those classified as obese from body fat percent. Specificity was 99.7%, and sensitivity was 35.8%. Using area under the curve and standard error values, body mass index performed significantly better for: Male versus female at 10 years, Asian versus European female except at 13-, 15-, and 16-years-old, Asian female versus male except at 10- and 15-years-old, and for European male versus female, 9- to 11-years-old (p < .05). Our findings provide evidence that users of body mass index should use caution when comparing body mass index across age, sex, and ethnicity.     

Transition phase clothing strategies and their effect on body temperature and 100-m swimming performance

Objective: Effective warm-ups are attributed to several temperature-related mechanisms. Strategies during the transition phase, preceding swimming competition, have been shown to prolong temperature-related warm-up effects. The purpose of this study was to evaluate the effects of two different clothing strategies during the transition phase, on subsequent 100-m maximal swimming performance. Methods: Nine competitive swimmers (3 female, 21?±?3?yrs; 6 male 20?±?2?yrs, mean performance standard 702 FINA Points, mean 100-m seasons best time 61.54?s) completed their own 30-min individual pool warm-up, followed by 7-min changing time and a 30-min transition phase, straight into a 100-m maximal effort time-trial. During the transition phase, swimmers remained seated, either wearing warm or limited clothing. Swimmers returned 1 week later, where clothing conditions were alternated. Results: Post-transition phase skin and core temperature remained higher in the warm clothing condition compared to the limited clothing condition (Mean Core: 36.90?±?0.17°C, 36.61?±?0.15°C, P?P?P?Conclusion: Wearing warm clothing during a 30-min transition phase improved swimming performance by 0.6%, compared to limited clothing.     

Accuracy of human motion capture systems for sport applications; state-of-the-art review

Objective: Sport research often requires human motion capture of an athlete. It can, however, be labour-intensive and difficult to select the right system, while manufacturers report on specifications which are determined in set-ups that largely differ from sport research in terms of volume, environment and motion. The aim of this review is to assist researchers in the selection of a suitable motion capture system for their experimental set-up for sport applications. An open online platform is initiated, to support (sport)researchers in the selection of a system and to enable them to contribute and update the overview. Design: systematic review; Method: Electronic searches in Scopus, Web of Science and Google Scholar were performed, and the reference lists of the screened articles were scrutinised to determine human motion capture systems used in academically published studies on sport analysis. Results: An overview of 17 human motion capture systems is provided, reporting the general specifications given by the manufacturer (weight and size of the sensors, maximum capture volume, environmental feasibilities), and calibration specifications as determined in peer-reviewed studies. The accuracy of each system is plotted against the measurement range. Conclusion: The overview and chart can assist researchers in the selection of a suitable measurement system. To increase the robustness of the database and to keep up with technological developments, we encourage researchers to perform an accuracy test prior to their experiment and to add to the chart and the system overview (online, open access).     

《晋图学刊》2002-2007年部分计量指标的统计分析

期刊评价是一项复杂的系统工程,如何更科学地评价学术期刊是人们普遍关心的问题。本文从文献计量学的角度对《晋图学刊》近年来的部分计量指标进行了比较分析,指出了一些计量指标在低水平上徘徊的原因,明确了该刊今后努力的方向。通过本文,读者可对《晋图学刊》的总体学术水平、学科地位等有一个客观、概括的了解,从而可以综合、全面地认识和评估该刊的学术质量。     

对公允价值计量属性相关问题分析

公允价值计量属性对会计信息的质量影响重大,尤其是我国新会计准则再次引入公允价值后,引起了会计界广泛的关注和讨论。因此,有必要对公允价值相关问题特别是基于经济学视角做进一步的适用分析。     

关于计算机类论文中参量定义中符号正斜体使用的建议

针对计算机类论文参量定义中的符号正斜体使用不规范的问题,指出目前用法中所存在的弊端,分析其原因并提出了在参量定义中规范使用正斜体的建议。     

大连市人类发展指数的测量与分析

1990年联合国开发计划署（UNDP）提出了超越GDP核算标准的发展评价尺度,即人类发展指数（HDI）。HDI是从人均GDP、教育指数和预期寿命指数三个维度来测量人类发展。在人类发展指数的测量中,大连市处于高人类发展水平,在人类发展中既有优势,同时也存在不足。针对不足,提出了四点解决的对策：关注公民的素质建设;关注特色文化的建设;关注发展的平衡性;关注发展的平等性。