速度攀岩运动员上肢肌表面肌电信号变化的研究

记录速度攀岩运动员上肢肌最大肌力的40%、60%和80%三种负荷强度下分别进行肘关节屈伸运动时腕屈肌和腕伸肌的表面肌电(sEMG)信号,并用MegaWin软件对之进行时、频阈指标的分析。结果表明:(1)sEMG信号分析中时阈指标AEMG和频阈指标MF、MPF都能较好监控速度攀岩运动员进行上肢肌力量训练时腕屈肌及腕伸肌的疲劳状况。(2)MF、MPF、AEMG出现显著下降时间的提前与负荷有着密切的关联,这为速度攀岩运动员训练上肢肌力量提供了科学的理论依据:教练员或运动员应根据上肢肌力量训练的持续时间来选择相应的运动负荷。(3)攀岩运动中腕屈肌与腕伸肌往往同步用力。所以,在平时的训练中都要重视腕屈肌、腕伸肌的力量训练,而不能有所偏向。     

谦卑型领导对下属沉默行为的影响机制研究

基于人—情境交互视角,探讨了具有中国儒、道两家思想特性的谦卑型领导对下属沉默行为的作用机理。480份企业员工数据统计结果表明:谦卑型领导、组织认同与下属沉默行为呈负相关关系;组织认同在谦卑型领导与下属沉默行为之间起部分中介作用;下属权力距离强化了谦卑型领导对下属沉默行为的负向影响,即下属权力距离感知越低,谦卑型领导对下属沉默行为的负向影响越强。而下属权力距离感知越高则降低了谦卑型领导的有效性,因而对员工沉默行为的负向作用的调节效果越弱。     

车牌识别系统中图像分割与识别技术研究

分析了汽车牌照的几何特征和成像特点,提出基于自适应性阈值的搜索策略,对图像中的车牌进行定位;利用Hough变换对图像进行倾斜矫正;然后设计一个三级分类器,对单个字符进行模式匹配,得到识别结果,最终实现对原始车牌图像的识别。     

企业安全文化认同机理及其影响因素

为明晰企业安全文化认同机理,进而提升企业安全文化建设效率与质量,分析企业主流安全文化的形成过程,并构建企业安全文化认同机理模型。在此基础上,分别从个体认同、群体认同与组织认同3个层面,阐释企业安全文化认同机理,提取对企业安全文化认同有显著影响的12个关键因素,并指出促进企业安全文化认同应从这些关键影响因素着手。结果表明,企业主流安全文化是员工认同企业安全文化的基础,企业安全文化认同是企业主流安全文化向企业强势安全文化过渡的关键环节。     

含水岩石的弱化与水库地震

本文通过实验确定了砂岩在干燥、饱水、有孔隙压三种情况下的摩尔破裂准则线(摩尔包络线);定量地说明了砂岩的弱化,并以此阐明水库地震的发生过程及其特点,指出了以往应力分析中的疏漏,指出含水岩石的弱化是水库地震等水诱发地震的首要的影响因素。     

浅谈绿色工位管理

针对企业中制造系统管理存在的问题,把全面质量管理与实际生产相结合,提出了绿色工位管理方式,并介绍了绿色工位管理的基本原理及具体实施方式,这种管理方法是达到精益生产的有效途径。     

Subspace design of low-rank estimators for higher-order statistics

Higher-order statistics (HOS) are well known for their robustness to additive Gaussian noise and ability to preserve phase. HOS estimates, on the other hand, have been criticized for high complexity and the need for long data in order to maintain small variance. Since rank reduction offers a general principle for reduction of estimator variance and complexity, we consider the problem of designing low-rank estimators for HOS. We propose three methods for choosing the transformation matrix that reduces the mean-square error (MSE) associated with the low-rank HOS estimates. We also demonstrate the advantages of using low-rank third-order moment estimates for blind system estimation. Results indicate that the full rank MSE corresponding to some data length N can be attained by a low-rank estimator corresponding to a length significantly smaller than N.     

Chips,tags and scanners: Ethical challenges for radio frequency identification

Radio Frequency Identification (RFID) systems identify and track objects, animals and, in principle, people. The ability to gather information obtained by tracking consumer goods, government documents, monetary transactions and human beings raises a number of interesting and important privacy issues. Moreover, RFID systems pose an ensemble of other ethical challenges related to appropriate uses and users of such systems. This paper reviews a number of RFID applications with the intention of identifying the technology’s benefits and possible misuses. We offer an overview and discussion of the most important ethical issues concerning RFID, and describes and examine some methods of protecting privacy. Norman G. Einspruch serves as a consultant to several high-technology companies, one of which is in the RFID components and systems business.     

价值认同与大学生核心价值体系教育

社会主义核心价值体系是社会主义意识形态的本质体现。高等学校肩负着培养社会主义合格建设者和可靠接班人的重任,更迫切需要坚持用社会主义核心价值体系武装大学生,努力使他们成为社会主义核心价值体系的深入学习者、坚定信仰者、积极传播者和模范践行者。完成好这一历史性任务的关键环节就是要在把握大学生对社会主义核心价值体系认同特点的基础上,从认知认同、情感认同和行为认同三个方面来实现大学生对社会主义核心价值体系的认同,构建起大学生社会主义核心价值体系价值认同教育体系。     

Profiling teachers’ sense of professional identity

This study shows that professional identity should not be viewed as a composed variable with a uniform structure. Based on the literature and previous research, we view teachers’ job satisfaction, self‐efficacy, occupational commitment and change in the level of motivation as indicators of teachers’ professional identity. Using two‐step cluster analysis, three distinct professional identity profiles have empirically been identified, based on data of 1214 teachers working in secondary education in the Netherlands. These profiles differed significantly regarding the indicators of teachers’ professional identity. Teachers belonging to the found profiles did not significantly differ in their amount of experience.