浅析解析函数的充要条件与主要性质

讨论了解析函数四个充要条件与主要性质的关系,同时辩证地分析了产生这些充要条件与主要性质的逻辑基础与思想方法,提出了复变函数教学内容、教学方法改革的建议。     

电荷泵锁相环系统相位噪声分析

阐述了基于无线通信领域中的锁相环的系统结构,并以电荷泵锁相环为例分析了锁相环中两类主要噪声对环路造成的影响,并推导了环路对噪声的线性过滤性能,基于推导的结果给出了减小环路噪声的几种解决方法.     

高职院校双语教学的实践与探讨

双语教学,是对外开放的产物,是加强与使用英语国家进行经济、文化、生活等方面进行交流的需要。开展双语教学,就是在课堂上,能够熟练运用汉语、英语两门语言进行学科的教与学,师生共同进入一种的汉语和英语教与学的环境,并熟练地运用汉语和英语进行学科知识上的教学与交流,最终达到师生均能运用两种语言、两种思维方式进行学科学习、思考和研究。     

AC-RBAC模型的形式化规约研究

本文提出的规约式简化了建模元素。对于大型系统,更易设计和实现。对于提出RBAC的部分规约,其中不涉及权限之间角色与权利之间规约,因而不完备,而且过于复杂,难以验证和实现。本文给出了模型形式化规约,这对进一步的机器验证和软件开发将有很重要的作用。     

带BB步长的自适应投影法解广义纳什均衡问题

广义纳什均衡问题是一种非合作博弈,其每个竞争者的策略集和目标函数都要依靠其他竞争者的策略.它在经济学、管理科学及交通运输等领域都有广泛的应用,但如何有效地求解广义纳什均衡问题仍然是备受关注的课题.本文提出了带有BB步长的自适应投影法求解广义纳什均衡问题:首先,把广义纳什均衡问题转化成拟变分不等式问题,然后把BB步长推广到求解拟变分不等式问题上,并在函数余强制条件下证明了算法的全局收敛性.数值结果进一步说明该方法的有效性.     

Resolution enhancement of nearfield acoustic holography by interpolation using band-limited signal restoration method

A new method based on interpolation using band-limited signal restoration method was proposed for enhancing the resolution of the nearfield acoustic holography. According to the band-limited property of the pressure on the hologram surface, a band-limited signal restoration method named Papoulis-Gerchbarg algorithm was used to realize the interpolation of acoustic pressure. Therefore acoustic pressure data on the hologram surface were increased, the sampling interval was reduced, the Information on evanescent waves which was lost because of the large sampling interval was partially recovered, and the resolution of nearfield acoustic holography image was improved. The experimental result shows that the method can enhance the resolution of the nearfield acoustic holography Image efficiently.     

Absorptive Capacity of Information Technology and Its Conceptual Model

In order to examine the problem of how to improve the use of information technology （IT） in enterprises, this paper makes an exploration from the perspective of organizational absorptive capacity. We propose the concept of IT absorptive capacity from an organizational level. A dynamic process model is developed to further analyze IT absorption. IT absorptive capacity of this process is embodied as six forms： identification, adoption, adaptation, acceptance, infusion, and knowledge management. By means of questionnaire surveys of 76 Chinese enterprises, the main factors that favor or disable the capacity of each stage are discovered. Using the method of system dynamics, a conceptual model of IT absorptive capacity is developed to analyze the action mechanism of the factors in detail. The model indicates that the critical factors are embodied in the aspect of management. Furthermore, it demonstrates that IT absorption is a spiral process, during which IT absorptive capacity evolves dynamically and, consequently, promotes IT use.     

Power control scheme for multiple antenna systems with space-time coding in Rayleigh fading channels

Two optimal power control(PC) schemes under the power constraint for space-time coded multiple input multiple output systems over the flat Rayleigh fading channel with the imperfect channel state information(CSI) are presented.One is based on the minimization of a bit error rate(BER),and the other is based on the maximization of a fuzzy signal-to-noise ratio.In these schemes,different powers are allocated to individual transmit antennas rather than equal power in the conventional one.For the first scheme,the optimal PC procedure is developed.It is shown that the Lagrange multiplier for the constrained optimization in the power control does exist and is unique.A practical iterative algorithm based on Newton’s method for finding the Lagrange multiplier is proposed.In the second scheme,some existing schemes are included,and a suboptimal PC procedure is developed by means of the asymptotic performance analysis.With this suboptimal scheme,a simple PC calculation formula is provided,and thus the calculation of the PC will be straightforward.Moreover,the suboptimal scheme has the BER performance close to the optimal scheme.Simulation results show that the two PC schemes can provide BER lower than the equal PC and antenna selection scheme under the imperfect CSI.     

论西藏农牧区学校体育现状及发展对策研究

文章通过对西藏农牧区中小学学校体育场地、器材现状、体育师资队伍现状、体育教学大纲的落实现状、学校课外体育活动的开展现状等进行调查和分析研究。提出了农牧区中小学学校体育的发展对策及建议。     

浅谈音乐在体育教学中的应用

随着体育新课程标准的实施,音乐已在学校体育教学中广泛应用,得到了广大体育教师的重视。音乐与体育有着密切的联系,通过分析音乐与体育在人的心理和生理上的关联作用,在体育教学中采取适当的音乐来辅助教学,可以有效的达到将音乐融入体育教学的目的。体育教学要充分利用音乐的韵律、节奏、艺术的美感,有效调动学生的积极性,激发对运动美的追求。对提高兴奋性,帮助学生学习体育知识,提高技术、技能,消除运动疲劳有很大帮助。音乐衬托体育,体育表现音乐,体育和音乐相辅相成。因此,把音乐引入体育与健康课堂具有非常重要的意义。