图的禁用子图与H-连通性

证明了4-连通的K1,4受限{I,Z,P5,Z2}-free或{A,P5,Q,Z2}-free图是H-连通的.     

对音程、和弦、旋律听力练习的方法

好的听觉是学习好音乐的关键。为提高学生听辨音乐的水平和能力,对音程、和弦、旋律听力练习的方法概括为:练习音程从理论上熟悉、记住音程的名称,音响上记住音高和效果;和弦听写用听辨、模唱、构唱记原位、转位音响;旋律听写通过大量视唱、背唱、默写来储存、掌握基本要素。     

隋炀帝与江南

杨广(隋炀帝)以军事手段辅以文化战略抚定了江南,并以江南为基地实施了夺宫计划,在登基后又为发展和控制江南作了许多努力,最后欲避难于江南再图天下不成而亡。考察杨广与江南的关系,江南是杨广的政治生命所在,杨广是隋唐时期“南朝化”的重要人物。尽管由于统治失策,杨广经营江南最终归于失败但在一定意义上仍可以说,他是西魏、北周以来第一个走出关中本位、具有开放意识的统治者。     

高师英语专科生的听力计划策略探讨

本研究以O'Malley和Chamot的认知学习理论为框架,通过问卷的形式对河西学院英语专科生元认知听力计划策略进行了调查。调查结果显示,调查对象在学习英语听力上的计划策略意识淡漠而混乱;英语专科生经常使用的听力计划策略中基本不包括长期的奋斗目标。     

提高学生英语听力的教学策略

要提高学生的英语听力,教师应注意教学策略。     

Building a highly available and intrusion tolerant database security and protection system (DSPS)

INTRODUCTIONHowtoprotectthedatabase ,thekernelre sourcesofinformationwarfare,isbecomingmoreandmoreimportantsincetherapiddevelopmentofcomputerandcommunicationtechnology .TheArtificialIntelligenceInstituteofZhejiangUni versityhasprototypedaDatabaseSecuritya…     

Mathematical Analysis of Energy Efficiency in IEEE 802.11 DCF

The standardized IEEE ,802. II distributed coordination function （ DCF） provides a contention-based distributed channel access mechanism for mobile stations to share the wireless medium. However, when stations are mobile or portable units, power consumption becomes a primary issue since terminals are usually battery driven. This paper proposes an analytical model that calculates the energy efficiency of both the basic and the RTS/CTS access mechanisms of the IEEE 802. II protocol. The model is validated with simulation results using NS-2 simulation package. The effects of the network size, the average packet length, the initial contention window and maximum backoff stages on the energy efficiency of both access mechanisms are also investigated. Results show that the basic scheme has low energy efficiency at large packet length and large network size, and depends strongly on the number of stations and the backoff procedure parameters. Conversely, the RTS/CTS mechanism provides higher energy efficiency when the network size is large, and is more robust to variations in the backoff procedure parameters.     

英语听力教学中的语境导入

在话语理解方面,语境识别是课堂教学中最容易忽视的问题。只有先从语境框架中的逻辑、心理和背景三个层面来分析语境意义及其动态特征，然后探讨在听力教学中如何运用语境理论，才能提高学生的听力理解能力。     

A novel method for mobile robot simultaneous localization and mapping

INTRODUCTION A key prerequisite for a truly autonomous robot is that it can simultaneously localize itself and accu-rately map its surroundings (Kortenkamp et al., 1998), which is known as Simultaneous Localization and Mapping (SLAM), which, when phrased as a state estimation problem, involves a variable number of dimensions. Murphy and Russell (2001) adopted Rao-Blackwellized particle filters (RBPFs) as an effective way for representing alternative hypotheses on robot paths and ass…     

阮元教育思想探析

清代著名学者阮元,创办了新式书院诂经精舍和学海堂,旨在培养有"经世致用"、对社会有用的人才.书院提倡德才兼备;主张因材施教,自由探讨;强调实事求是,学以致用;学术研究和教学相结合;确立破旧立新、推举学长的教学体制.倡导了实践,培养了学生的实际能力.阮元的教育思想和实践对清末的教育界产生了深远的影响,为中国的教育事业做出了突出的贡献.