离散数学课程的教学与实践

离散数学是计算机类专业中一门重要的专业基础课程。根据计算科学专业人才培养和社会需求,结合离散数学课程的特点,作者结合自己的教学实践,对离散数学教学的现状做了全面的分析,并从教学内容、教学方法、实验教学等方面提出在专业教学中改进的对策和措施,从而提高离散数学的教学效果。     

离散数学课程教学问题分析与对策研究

文章首先分析了在离散数学课程教学中易出现的问题;然后从教学方法改革,激发学生的学习兴趣;建立新的教学模式,注入实验教学环节;加强网络课程体系建设,充分利用网络辅助教学平台三个方面,探讨了加强离散数学课程建设,提高离散数学教学水平和质量问题。     

对离散数学的教学探讨

离散数学是一门计算机科学与技术专业的核心骨干课程,离散数学课程的教学质量对学生素质的培养,能力的提高起着举足轻重的作用。笔者根据自己教学经验和体会对离散数学质量的提高及教学方法进行了探讨。     

《离散数学》高级实验设计探讨

从研究当前《离散数学》实践教学环节的现状出发,讨论开展《离散数学》高级实验的必要性,并提出了《离散数学》高级实验的设计思路和具体实验内容,最后给出了实施办法和效果分析。《离散数学》高级实验针对优质生源,培养具备综合素质的高层次人才。     

《离散数学》课程中关于图论的教学探讨——基于计算机专业专科层次

离散数学是计算机专业的核心课程,学好该课程对于学习计算机专业的其它课程以及培养学生抽象思维能力和解决问题的能力至关重要。本文在分析了图论教学存在的问题之后,从计算机专业专科角度提出了一些提高离散数学教学效果的教学改革方法。     

基于应用型人才培养的离散数学双语教学探讨

在计算机专业进行离散数学双语教学的试点是为了培养适应社会需要,既精通专业又精通英语的现代型人才.本文就应用型地方本科高校中离散数学课程实施双语教学实践进行总结,并在对教学过程中遇到的问题进行分析的基础上,分别就教材选择、教学主体、教学方法等方面进行探讨.     

网络安全与执法专业离散数学课程教学改革探索

通过全面分析《离散数学》在网络安全与执法专业课程体系中的地位及该课程的基本知识体系构成,提出结合专业及知识模块特点的教学改革思路,引入案例教学、习题教学、实验教学、拓展教学等激发学生学习兴趣扩展学生知识面的教学手段,探索以实际应用为导向的新型课程教学模式。     

师范院校计算机专业《离散数学》教学内容改革研究

根据当前计算机专业人才培养的特点和离散数学教学内容的现状，从我校实际教学出发，立足学生生源的客观现实，对《离散数学》教学内容选取的改革进行了研究和探讨，以期符合新建本科院校的实际.     

计算机专业离散数学课程教学改革探讨与实践

离散数学是计算机专业的一门很重要的专业基础课,该课程概念多,理论性强,高度抽象,学生的学习积极性不高。本文结合实际教学,详细阐述了如何通过教学内容的调整和增加实验教学来提高学生的学习积极性,从而进一步提升该课程的教学水平和教学质量。     

基于实践教学的《离散数学》课程改革

针对《离散数学》教学中只注重理论、忽略实践教学这一问题,对国内外《离散数学》教学内容进行比较分析,指出《离散数学》实践教学对提高学生逻辑思维能力、动手能力、创新能力和学习兴趣等有重要作用,提出《离散数学》教学改革中的实践教学具体实施方案。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

英文诗歌中的喻类修辞

为了有助于提高英文爱好者的个人情操、文化素养和学习兴趣,以及专业人员对英语学习和研究进行多途径的探索,本文通过一些精选诗歌的引证和分析,着重论述了喻类修辞法在英文诗歌中的运用其及效果。     

Man Is Unable to Change the Miserable Life——Analysis of the Arrangement of Four Characters in The Glass Menagerie

Tennessee Williams is considered as one of the most important American playwrights since World War II.The Glass Menagerie is his first successful drama,which describes a tragic situation of family and means to say that Man is unable to change the miserable life,no matter whatever means he try,This essay focuses on the analysis of the arrangement of the four main characters:Laura.Amanda,Jim and Tom to reveal the theme.Laura is fragile.Amanda is brave.Jim is vital.Tom is sensible.And all of them develop and try the different means to struggle against life,but fail tragically.With the evidence,the paper comes to conclusion naturally that Man is unable to change the miserable life,and he dooms to fail.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

An Affordable Accurate Evaluation of the Binding Conformations Predicted by Molecular Docking Studies in Bio-System

正Recently,docking has been widely used to predict the binding-modes of protein-inhibitors,when the crystal complexes structure was absent.Most docking algorithms are able to generate a large number of probable conformations,it,however,is difficult to effectively evaluate these docking poses and identify the most reasonable bindingmode.In the present study,on the basis of the crystallographic data of human 3-hydroxy-3-methylglutaryl coenzyme     

WIMAX与WI-FI技术分析及联合组网

介绍了WiMAX与Wi-Fi两种无线宽带接入技术,并对两者之间的关系及相互之间的影响做了对比及分析,并对WiMAX的关键技术进行了详细说明,最后对两者的联合组网方式做了简单的探讨。