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。     

《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。     

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》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。     

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.     

应用型本科院校“离散数学”课程教学改革探讨

“离散数学”是计算机科学与技术、信息与计算科学等专业一门必修的专业基础课程,有较强的理论性和专业实用性．在“离散数学”教学中应帮助学生完成“从理论到实际”的转变,使学生掌握理论和应用的方法;优化教学内容,抓好理论教学,重视实践性教学环节,培养学生创新精神和实践能力．     

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。     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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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海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

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.     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to