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1.
特定信源符号在整个通信过程中起到关键作用,针对信息论中描述的这些信源符号信息量的不足,采用自信息量与信源符号先验概率相结合的基本思想提出符号信息量概念.利用符号信息量来衡量特定信源符号在整个通信过程中所提供的信息量大小,同时给出了符号信息量的数学特征和物理意义,理论证明有效刻画了通信过程中特定信源的信息量.  相似文献   

2.
江泽民总书记在党的十四届五中全会上谈到国防建设与经济建设关系时指出,在现代条件下中国人民解放军应着力提高防卫能力与应急机动作战能力.本文从通信联络角度分析了提高应急机动作战指挥的方法与途径.通信技术是传递、交换和贮存信息的工具.尽管现代通信方式形形色色,但完成一个通信过程,离不开信息系统所共有的三大要素:信源、信道和信宿.在英语中,“通信”和“交通” 是一个单词(Communication),“信源”和“信宿”好比是运输物质的始发站和终点站,“信道”相当于行驶车辆的道路.打电话时,发话人是信源,受话人是信宿,电话线是信道.发电报时,发方报务员是信源,收方报务员是信宿,电报线是信道.  相似文献   

3.
从霍夫曼编码的角度,来验证香农第一定理有关无失真信源编码压缩理论,即通过具体实例对扩展信源进行无失真信源编码霍夫曼编码,特别是通过比较离散无记忆信源和平稳遍历的Markov信源对比来验证数据压缩理论。同时,也可看出霍夫曼编码对有记忆信源具有很好的数据压缩效果。  相似文献   

4.
论文关注灾难事件微博传播中的关键主体——媒体人微博,从微博信源的角度来回答“谁在影响媒体人”这一问题。采用内容分析法,以云南鲁甸地震为个案分析灾难事件微博传播中媒体人的信源结构。内容分析结果表明媒体是媒体人微博的主要信源,媒体人的微博信源结构较稳定,媒体人的信源使用与立场表达带有显著偏向性。  相似文献   

5.
课堂教学是一个动态过程,信息在信源信宿之间必须形成正向输入和反向回流,才能产生作用,发挥功能.信息在本质上是一种负熵.它表征物质和能量在时空中的不均匀状态,是从不均衡趋向均衡这一变化中的物质能量交换.信息是流动的,它本身只有在流动中才能存在.因而,为使知识信息得以传播,要把课堂组织为传递信息的动态系统.根据申农通讯模型,信息系统的一般构成是:信源→发送机→发送信号→信道→接收信号→接收机→信宿.这里,特别需要指出的是:信源的储备信号必须通过发送装置变化为发送信号,经过信道和接收装置才能输入信宿.因此,在发送信号和接收信号之间,必须通过联系双方的共用信号库这一中介,即发送信号库→共用信号库→接收信号库.对于教学而言,教师即信源,学生即信宿,中介即  相似文献   

6.
基于Simulink设计的PCM语音通信系统,包括信源编码、信道编码、交织、以及数字调制等模块.针对信源编码,详细介绍了PCM模块的构建;针对数字调制,构建了含BPSK、滤波器、以及信道在内的子系统.最后通过仿真验证该系统的可行性,为实际的工程应用提供依据.  相似文献   

7.
针对现有数字信源输出信号类型少,特别是不能满足帧同步实验的需要的缺点,采用CPLD技术设计了一种新型的数字信源电路,并介绍了系统的组成及工作过程。该数字信源电路可以演示数字复接过程,输出数据逐帧重复、逐帧变化的时分复用数字信源信号,输出漏同步和假同步测试信号。若将漏同步和假同步测试信号输入到帧同步电路,可以让学生更直观地了解到帧同步电路中,漏同步和假同步保护电路的功能和作用。  相似文献   

8.
在网络事件的舆论传播中,传统媒体作为网络关键的信源存在。相对于网民个体性信源,传统媒体可信度稳定,能够提供事件进展的调查性信息、理性权威的评论、平衡公平的报道。传统媒体的专业优势,使得其比网民信源更能设置网络议程,进而引导网络舆论。传统媒体应积极发挥专业优势,以网络关键信源的角色来强化其对网络传播的议程设置功效,引导网络舆论健康发展。  相似文献   

9.
姚欣 《华章》2012,(33)
本文通过对DVB系统中信源编码原理的分析以及MPEG-2标准的解读,对TS传输流中的节目专用信息(PSI)和业务信息(SI)的结构进行分析,并在此基础上设计并实现了针对TS传输流的自动分析软件.整个设计流程分为总体设计和软件设计两部分.总体设计,根据信源编码原理,在系统需求分析的基础上,规划系统各部分功能模块,设计对象模型;软件设计部分包括系统实现方法与原则、系统功能模块实现以及系统平行测试等.  相似文献   

10.
介绍了在损伤的远端神经与近端神经间利用微电子神经桥实现神经信道桥接的技术,设计并实施了一个实验方案,验证了微电子模块实现神经信道桥接的可行性.以信源脊蟾蜍在化学刺激下诱发的坐骨神经信号作为信号源,激励受控脊蟾蜍的坐骨神经,控制其动作.通过示波器观察并记录了信源脊蟾蜍坐骨神经信号、再生后的受控脊蟾蜍坐骨神经信号及其肌电信号.通过分析信源脊蟾蜍坐骨神经信号与受控脊蟾蜍坐骨神经信号以及受控脊蟾蜍坐骨神经信号与肌电信号间的互相干函数,证明再生后的受控脊蟾蜍坐骨神经信号与信源脊蟾蜍坐骨神经信号有关,并对受控脊蟾蜍的缩腿动作起着控制作用.  相似文献   

11.
论述了信息技术的发展对高等数学所产生的深刻影响,利用信息技术与高等数学的整合,发挥信息技术辅助高等数学教学的优势,能够提高教师进行高等数学的教学效率,并且激发学生学习高等数学的兴趣。同时对高等数学与信息技术的整合,提出了思考和一些合理化的建议。  相似文献   

12.
13.
指出了构成信息理论体系的关键物理量:熵、互信息、信道容量和信息率失真函数,对它们的定义、物理意义及相互关系进行了探讨,用这些物理量导出信息理论体系,得到与这些物理量相对应的基本编码定理,即无失真信源编码定理、信道编码定理和限失真信源编码定理。  相似文献   

14.
The purpose of this study was to determine the effect of information mapping strategy on mathematics conceptual knowledge of junior high school students in Rokan Hulu Riau, Indonesia. The study also examined the relationship between mathematics conceptual knowledge and mathematics achievement. Using a quasi-experimental method, the study was carried out on 132 students from one junior high school in Rokan Hulu Riau, Indonesia. It was completed in 6 weeks. Instruments used in this study were mathematics conceptual knowledge test and mathematics achievement test. The results of this study indicated that there were significant differences in mathematics conceptual knowledge between the information mapping strategy group and the traditional group. It was concluded that using information mapping strategy may impact students' conceptual knowledge. There was a relationships between mathematics conceptual knowledge and mathematics achievement.  相似文献   

15.
The low pass rate in Brunei Year 13 mathematics is a source of concern for many stakeholders. Success in mathematics is required for students wishing to attend university and pursue courses in the sciences and technology. Many different factors contribute to success and failure in mathematics. This field survey (N = 330 randomly selected Year 13 students representing 179 females and 151 males) determined the extent to which coping mechanisms, study strategies, learning styles, and self-efficacy were related to academic achievement in mathematics. Stepwise multiple regression analysis with backward elimination identified six statistically significant main effect variables with links to mathematics achievement (task-oriented coping, textbook reading, concentration, self-efficacy, time management, and activist learning style). Two-way interactions of the male and female genders with deep processing and reflector learning styles were also significantly associated with mathematics achievement. Other significant interaction variables were beneficial to both genders.  相似文献   

16.
ABSTRACT

The quality of students’ learning experience depends on the learning activities that their teachers plan prior to classroom delivery. This article characterises the lesson planning practices of a group of 27 mathematics teachers. The questionnaire and the associated information coding and analysis procedures designed for that purpose may be applicable to lesson planning characterisation involving larger groups of teachers and of other disciplines. Some of the study group’s needs and difficulties are established. One of the observations discussed is that planning procedures and criteria tend to be generic rather than specific to the lesson at issue. Another is that these teachers’ vision of planning does not necessarily ensure a coordinated approach to all curricular dimensions.  相似文献   

17.
This article documents efforts to advance inclusive mathematics education practices involving the introduction of equity-oriented resources in state-level mathematics standards guidance documents in a Midwestern United States jurisdiction. We adopt a critical stance by looking at ways to interrogate available metatheories for these kinds of change-making processes. The guiding resources documented in the present article center on issues of difference. These issues are related to dis/ability in mathematics education standards and curriculum to not only raise teachers' awareness of constructions of difference in order to foster inclusive education, but also to promote critical self-reflections around ableism. Guiding resources are a means to support recognition of dis/ability difference as a source of multiple mathematical knowledge bases from which to learn and advance mathematics thinking. Yet, we also recognize the need to be vigilant about the complex interpretative contours and the relational dynamics at work throughout their various layers of implementation, assessment, and anti-ableist realignment. Accordingly, we reflect metatheoretically about three questions: How might concepts of access, achievement, identity, and power support teachers of mathematics in advancing inclusive practices? How do word choices in mathematics standards, curriculum, and practices dis/able students in classroom practices? What may we learn from the mathematics education experiences of individuals with dis/abilities and their families in the broad configuration of change-making dynamics of educational policies and teaching practices?  相似文献   

18.
"网络教学"是现代多媒体技术与教学内容的整合,是一种新型的教育教学手段。数学的教育教学在知识和信息资源的输入受传统黑板教学的约束,所以很多的数学抽象性描述和大量实现手段难以进入课堂,要想突破这些难点,开发网络课程会给数学教育教学带来春天,即实现高职数学教学网络化是很好的一种选择,利用多媒体网络课程进行教学是一种很好、可以交互的教学方式。为了满足基于网络的远程教育的需要,开发高质量的高职数学多媒体网络课程教学软件已成为必然。  相似文献   

19.
数学可分为研究性数学和教育性数学。研究性数学主要注重科学逻辑的序,而教育性数学则注重科学逻辑的序与认知心理的序之间的完美结合,后者即“教育数学”。教育数学是在研究性数学基础上的再创造、再提高,教育数学对数学教育改革具有深远的意义。  相似文献   

20.
对高等数学的教学方法进行探讨,从以下四个方面结合实例进行阐述:1)重视数学概念、符号教学,提醒学生勿要望文生义;2)重视传统教学技巧的教学,培养学生的数学能力;3)深度钻研教材,化解学生的困惑;4)利用数学学科分支知识渗透教学,培养学生学习兴趣.  相似文献   

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