基于合作式学习的《利息理论》课程教学探析

合作式学习是一种旨在促进学生在异质小组中互相合作，实现共同的学习目标，并以小组的总体成绩为奖励依据的教学策略体系。文章介绍了合作式学习理论，分析了“利息理论”课程传统教学方法的缺陷，提出一种基于合作式学习理论、优化整合课程内容、采用多元化评价的新型教学方式。     

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。     

FRP管-混凝土-钢管复合套管约束性能有限元分析

为了研究FRP管-混凝土-钢管复合套管的约束性能,采用修正的Hognestad表达式来描述混凝土单轴受压应力-应变关系,利用ABAQUS软件对FRP约束混凝土短柱轴压试验进行有限元模拟,并与试验结果进行了比较,表明有限元模型通过精确定义材料参数、单元模型、表面作用、边界条件,可准确描述FRP约束混凝土短柱力学性能.在此基础之上,分析了FRP管-混凝土-钢管复合套管中3种材料厚度变化对管约束性能的影响.结果表明,在复合套管的约束作用下,核心混凝土的轴向应力-应变曲线呈现双线性的特点,复合管中的钢管主要影响第一线性段,而FRP管和混凝土主要影响第二线性段.该结论为今后进行该类组合柱的研究提供了参考.     

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.     

Grid-based directed diffusion for wireless sensor networks

Directed diffusion is a data dissemination protocol for wireless sensor networks. In directed diffusion, flooding is used for dissemination of interest and exploratory data, which will bring broadcast storm resulting in substantial energy consumption of networks. A grid-based directed diffusion is presented to improve the energy efficiency of directed diffusion. Virtual geographic grid clusters are constructed by self-organization of nodes using geographic location information. The flooding of interest and exploratory data of original directed diffusion is limited in cluster head nodes. The simulation results and testbed experiments show that the method effectively reduces the network energy consumption. This gain is not achieved at the cost of either delivery ratio or the delay. Importantly, the decreased load also leads to a better delivery ratio and lower delay.     

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.