浅析《计算机网络》课程实验仿真实现方式

《计算机网络》是一门开设广泛的课程,设计相关课程实验有助于学生理解网络系统基本原理和基本概念,提高网络操作应用能力。考虑到多数高等院校的课程学时安排、现有设备及实验室人员配备水平等因素,可以将仿真方法作为教学实验手段之一,通过仿真实现《计算机网络》教学课程实验设计,加深对教学内容的理解。文中阐述了现有的《计算机网络》教学实验仿真实现的主要思路及实现过程,并加以进行分析,探索了网络课程实验仿真实现的新思路。     

计算机网络虚拟实验环境的研究与实现

在《计算机网络》课程的教学过程中,各类网络实验教学是其中一个重要的组成部分,而网络设备价格昂贵且不利于统一管理维护。实现一种适合高职高专院校《计算机网络》课程实验教学使用的虚拟实验环境,在保证和提高《计算机网络》课程实验教学质量同时,为课程的专业教师提供了一种新的教学实验方法。     

高校非专业计算机网络课程教学改革

针对高校非计算机专业计算机网络课程目前的教学现状,在教学内容、教学方法、教学手段、教学实验方面提出教改建议.     

一种基于校园网的网络工程教学实验模式

针对一般计算机网络实验课程与实际应用有一定距离的情况,结合高校校园网的技术、装备、建设特点,提出一种基于校园网的网络工程教学实验模式,并在计算机网络课程教学中进行实践,取得了良好的实验教学效果。     

网络仿真技术在计算机网络实验教学中的应用研究

通过编写一个Otcl实例代码,实现了对网络拓扑的仿真,由此说明网络仿真是研究网络技术的有效工具;介绍了NS2仿真过程中代码编写、网络拓扑构建、实验演示等技巧,并通过分析实验输出文件得到了符合期望的结果;分析了网络延迟、抖动率、遗失率和平均吞吐量等网络模型性能。实验结果表明,NS2具有良好的实用性和较强的通用性。因此,使用NS2对教学实验网络建立仿真模型,不仅能很好地缓解高校网络实验室建设的压力,而且可以改善计算机网络课程实验教学方法和手段,取得计算机网络课程教学的良好效果,培养学生的创新思维。     

利用虚拟主机软件在单机上构建网络课程实验平台

文章分析高等学校网络课程教学中的实践性教学任务，提出利用虚拟机软件在单机上构建网络课程教学实验平台，完成实践性教学任务．     

“计算机组成原理”在师范院校教学改革的探讨

本文针对师范本科院校的特点,对"计算机组成原理"课程的教学进行探讨,总结了"计算机组成原理"教学过程中所遇到的问题及课程的特点,并围绕教学方法、教学手段和教学实验进行研究并提出一些改革措施。     

计算机实验教学改革探讨

文中深刻剖析了我国高等院校计算机实验教学的基本状况，并根据教学实验中所存在的有关教学课程设置混乱、实验改革形式化、教师队伍缺乏实际操作经验的问题，提出应从教学实验管理者、教师以及学生三个方面同时着手，改变所有实验教学参与者思想意识的方法。设计并实现一系列综合设计型、多元化实验课程的新思路，力求可以在根本上解决目前我国高校计算机实验教学中存在的问题。     

“控制系统CAD及仿真”课程教学改革探讨

为了进一步提高自动化本科学生的系统设计及应用能力,提高教学质量效果,结合作者的教学实践经验,从课程的教学目的,面临问题,教学实验以及课程考核方式等方面对＂控制系统计算机仿真＂课程进行探讨。     

梯度化“大学IT”实验内容改革初探

"大学IT"实验课程教学是培养学生计算机应用能力的关键因素和主要手段,分析了现有实验教学中存在的实验内容不分层次、实验教学方式单一、实验教学资源匮乏等一系列问题,提出了用具有梯度化的实验教学内容来提高实验教学效果、增强学生学习兴趣的解决方法。并进一步详细说明了梯度化教学实验内容的具体设置、实施方案以及评价标准,进而搭建了交互式"大学IT"网络实验教学平台的框架。这一方法在曲阜师范大学计算机公共课教学实验活动中推广,收到了显著的效果,对"大学IT"的实验教学有明显的改善。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

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

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

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。     

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.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

正~~     

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