The use of player physical and technical skill match activity profiles to predict position in the Australian Football League draft     

Carl T. Woods  James P. Veale  Neil Collier  Sam Robertson 《Journal of sports sciences》2017,35(4):325-330

This study investigated the extent to which position in the Australian Football League (AFL) national draft is associated with individual game performance metrics. Physical/technical skill performance metrics were collated from all participants in the 2014 national under 18 (U18) championships (18 games) drafted into the AFL (n = 65; 17.8 ± 0.5 y); 232 observations. Players were subdivided into draft position (ranked 1–65) and then draft round (1–4). Here, earlier draft selection (i.e., closer to 1) reflects a more desirable player. Microtechnology and a commercial provider facilitated the quantification of individual game performance metrics (n = 16). Linear mixed models were fitted to data, modelling the extent to which draft position was associated with these metrics. Draft position in the first/second round was negatively associated with “contested possessions” and “contested marks”, respectively. Physical performance metrics were positively associated with draft position in these rounds. Correlations weakened for the third/fourth rounds. Contested possessions/marks were associated with an earlier draft selection. Physical performance metrics were associated with a later draft selection. Recruiters change the type of U18 player they draft as the selection pool reduces. juniors with contested skill appear prioritised.  相似文献   

后牙折裂原因与分类初探     

张李明  卢东民 《湖州师范学院学报》2004,26(2):95-97

收集典型病例，观察年龄、牙位、牙髓状况、充填洞型、咬合等与牙折裂的关系，按斜折、纵折、横折、粉碎折四型对牙折进行分类，研究发现：后牙折裂年龄集中在30～60岁，上下颌第一磨牙折裂率最高．折裂与牙髓状况、充填、咬合有关，各型牙折以Ⅰ类B型和Ⅱ类B型牙折率较高．死髓牙、严重磨耗牙、Ⅱ类洞充填的牙要特别注意防止其发生牙折，不同类型的牙折治疗原则应有针对性。  相似文献   

高速线材核心设备在线监测诊断技术的应用     

朱昌健  赵凯星  王双启 《唐山学院学报》2007,20(6):33-35

为提高高速线材设备的预知维修能力,达到降低成本、减少事故时间的目的,对高速线材核心设备安装在线监测诊断系统。通过系统的运行,实现预知维修,对设备的安全可靠运行起到了积极的保障作用,同时保证了连续性生产。  相似文献   

Characteristics of electricity consumption of different industry types considering atmospheric condition     

KANG Yeon-Hee  JEON Gyu-yeo  NAM Gyeong-mok  HONG Won-Hwa 《重庆大学学报(英文版)》2011,10(4):168-176

Reducing greenhouse gases (RHG) is going on actively in the international movement. In the field of architecture, RHG is an inevitable work. To establish a plan for RHG, firstly we need to reduce energy consumption. Greenhouse gas generated by energy consumption is the main cause of global warming. For this we should know that how much electricity consumption we use. The research targets of this study are commercial buildings with various businesses. Their electricity consumption was analyzed by business units rather than buildings. Each business was divided into 13 sectors according to industrial classification and electricity consumption was analyzed for each industry. For commercial buildings, the electricity consumption is done by the private sector and construction management is an autonomy system in private instead of an integrated management system. In this study, we classified and analyzed the electricity consumption characteristics according to collected data, analyzed the relationship between the electricity consumption with atmospheric temperature through SPSS, and developed an electricity prediction model.  相似文献   

Modeling of Light-Induced Changes in Reflectance Spectra: A Predictive Tool for the Effect of an Arbitrary Spectral Irradiance     

Beate Villmann  Gregor Peltri 《文物保护研究》2019,64(1):54-61

Optical radiation is capable of altering the spectral reflectance of layers of colorants. Light damage is of particular importance in respect to unique historical objects in exhibitions. The major parameter governing this process is the spectral irradiance applied to the surface. As this may vary significantly for different light sources, an experimental investigation of the damage potential of the numerous illuminants available is a cumbersome task. In this work a numerical algorithm for the prediction of modifications of the spectral reflectance of colorants subject to a given arbitrary spectral irradiance over a given time is presented. It uses the temporal evolution of the spectral reflectance of the dye or pigment at issue when irradiated by a set of narrowband light sources as input data. The predicted reflectance spectra and the resulting color changes are compared to those measured for samples irradiated with common polychromatic light sources. The concept described in this work aims at the implementation of a standardized procedure and database for the prediction of radiative damage for a comprehensive range of pigments and dyes.  相似文献   

结合速度和干扰观测的船舶路径跟踪模型预测控制     

李宗宣  卜仁祥  范艺 《上海海事大学学报》2021,42(1):19-25

针对船舶路径跟踪控制中的舵角需优化﹑舵幅和舵速受约束等问题,提出模型预测控制(model predictive control,MPC)算法。为处理系统高阶状态值不易测量以及环境干扰问题,设计高阶非线性观测器,同时对船速和包含模型不确定项和外界干扰的总未知项进行估计。以引入舵机响应系统的MMG模型作为预测模型,不仅能提高预测精度,而且更符合船舶运动控制的实际情况。仿真结果表明,所设计的控制器在风浪流时变干扰下仍能跟踪参考路径,舵角幅值小且其变化是光滑的,速度值和总未知项也均能被准确地逼近,验证了所提算法的有效性。  相似文献   

酶发酵过程模糊预测控制     

方千山  王永初 《上海海事大学学报》2001,22(3):226-227

介绍一种基于模糊逻辑的预测方法,通过对发酵过程的模糊辨识,建立模糊预测控制模型.该模型应用于木糖醇发酵过程,取得了良好的效果.  相似文献   

女性胆固醇随年龄变化灰色GM(1,1)预测模型的建立     

张维朋 《科技通报》2011,27(4):479-483

研究女性胆固醇随年龄变化的趋势.采集大最女性胆固醇数据,以10岁为年龄段,计算每个年龄段健康女性胆固醇平均值,并以女性70岁以下6个年龄段的胆固醇为原始数列,建立了女性胆固醇随年龄变化的灰色系统(GM(1,1))模型预测.后验差检验合格,预测70～79岁、80以上年龄段的女性胆固醇.预测分析结果表明,灰色系统GM(1,...  相似文献   

一种广义预测隐式算法的仿真分析     

张敏杰  李国勇 《科技成果管理与研究》2011,(12):85-87

广义预测控制作为一种随着自适应控制的研究而发展起来的预测控制方法,具有柔化作用,多步预测,滚动优化和在线自适应校正等优点。修正算法有多种,大体上可分为显示算法和隐式算法,文章介绍了一种广义预测隐式自校正控制算法,并对其进行仿真分析。总结主要参数的改变对整个系统性能的影响。结果表明,此算法具有优越型和可行性。  相似文献   

聚合反应釜温度控制系统算法简介     

张文丽 《英才高职论坛》2006,(3)

本文总结了近20年来国内外关于聚合反应釜温控系统研究的进展情况,其中主要叙述了自适应控制、人工智能控制、模糊控制、预测控制等在聚合反应釜温控系统中的应用。  相似文献