共查询到19条相似文献,搜索用时 125 毫秒
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无线电管理的概念和本质国家无委办法规处马政什么是无线电管理,无线电管理的定义是什么,这是长期从事无线电管理工作的人们一直在试图解答和表述的问题,然而大多数解释和表述都没有对这个概念作出科学的回答,仅仅是对这个概念进行同义反复,或至多再加上管理工作的内... 相似文献
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在文化人类学中,吉尔兹提出地方性知识概念,它强调了在特定环境中形成的具有文化特质的知识。在对"科学素养"概念理解多元化的背景下,公众科学素养调查引入地方性知识问题日益成为关注的焦点。本文在探讨科学素养调查引入地方性科技知识合理性问题的基础上,选取了兼具民族性和边缘性的内蒙古地区的公众,进行了国家标准问卷和具有内蒙古特色的地方性科技知识问卷的双重调查,并对调查结果进行了对比分析,以此对讨论的科学素养衡量标准多元化提供一个案例支持。 相似文献
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互信息作为一种模式距离测度已经被成功地应用在语音识别中,并由此提出了语音识别的互信息匹配模型。本文运用统计方法对互信息测度的聚类特性进行了分析,对其实际识别性能进行了实验评价,并与传统的距离测度Euclidean,Mahalanobis和Itakura-Saito进行了比较。分析与实验表明,互信息测度具有较好的聚类特性,相应的类内凝聚度较高,类间耦合度较小,在采用线性预测倒谱系数LPCC作为特征参数时,运用互信息测度的错误识别率较小,仅为运用Euclidean测度时的50%。 相似文献
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一种基于人耳听觉特性的语音客观测度研究 总被引:8,自引:0,他引:8
文章研究基于人耳听觉特性的Bark谱测度评价方法。由若干2测试语音条件的客观失真距离和偏差的计算结果表明,该测度具有较高的主、客观相关系数,并在此基础上,与LPC-CD测度进行了比较。 相似文献
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弗雷恩通过对被视为历史剧的《哥本哈根》的多元叙述,虽然被指责历史失实,但却达成了科学实验的形式结构,并在形式外衣下完成了同构的哲学表意,在科学与人文的辩证关系中暗示出科学传播的新路径:变以"文化中空"的文艺形式包装科学内容,为以丰富充盈的人文内核填充科学形式。 相似文献
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杨明建 《电气电子教学学报》2011,33(3):112-113,116
本文对“电气控制”课程教学中的离散态控制技术的理论概念要点作了简要讨论,给出了离散态控制系统的三元组描述的理论概念建立及其讲述的思路。文中分析指出,任一特定的离散态控制系统都与一具体的三元组模式对应。理论概念的建立,旨在培养学生能对生产过程中的离散态控制需求,进行抽象分析及在理论指导下的工程设计能力基础。 相似文献
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随着社会经济的飞速发展,人们的文化素养也得到了很大的提升,人们在社会中参与公共事务的愿望不断增强,对科技知识的要求也越来越高。本调研以2013年科技周期间上海向公众开放的科研机构实验室为调查样本,了解其对公众开放的情况以及开放效果,以期对今后相关工作提供切实可行的建议。调研发现虽然开放机构涉及各个专业,且展示形式多样,但开放期间的观众流量仍然偏低,建议在以后的开放活动中,应加大对活动的宣传力度;开放机构应与周边相关机构联动以扩大影响力;同时要对开放效果好的实验室予以奖励,以提高相关机构对开放活动的积极性。 相似文献
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The torus is a topology that is the basis for the communication network of several multicomputers in use today. This paper
briefly explores several topological characteristics of a generalized torus network using concepts from Coding theory and
Graph theory. From Coding theory, the Lee distance metric and Gray codes are extended to mixed radix numbers. Lee distance
is used to state the number and length of disjoint paths between two nodes in a torus. In addition, a function mapping a sequence
of mixed radix numbers to a mixed radix Gray code sequence is described; and, provided at least one radix is even, this sequence
is used to embed in the torus a cycle of any even length, including a Hamiltonian cycle. The torus is defined both as a cross
product of cycles and using Lee distance. The graph-theoretic definition of a torus leads to a simple single node broadcasting
algorithm, which is described in the last section.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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文化遗产是一个地区的文化传承,是一个地区的精神文明寄托,体现了该地方人民生活情趣。是历史遗留下来的产物,好好利用和开发,会对一个地方的旅游业的发展起到极大的促进作用。地域性是文化遗产的重要特征之一,非遗旅游资源是一定地域内人们智慧的结晶,其文化内涵丰富,旅游价值高,可以有效促进当地旅游业的发展。 相似文献
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The class of uniform trellis-coded modulation (TCM) techniques is defined, and simple explicit conditions for uniformity are derived. Uniformity is shown to depend on the metric properties of the two subconstellations resulting from the first step in set partitioning, as well as on the assignment of binary labels to channel symbols. The uniform distance property and uniform error property, which are both derived from uniformity but are not equivalent, are discussed. The derived concepts are extended to encompass transmission over a (not necessarily Gaussian) memoryless channel in which the metric used for detection may not be maximum likelihood. An appropriate distance measure is defined that generalizes the Euclidean distance. It is proved that uniformity of a TCM scheme can also be defined under this new distance. The results obtained are shown to hold for channels with phase offset or independent, amplitude-only fading. Examples are included to illustrate the applicability of the results 相似文献
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从传统的科普概念到数字传播时代的科技传播行为,是数字技术在期间造就了数字传播的概念。通过对数字科普概念的再定义,我们认识到:社会的体制文化层决定数字科普的发展;观念文化层影响数字科普的内容;而物质文化层则是数字科普的需求动力。担当数字科普工作的机构与个人在将科学艺术引入数字科普的同时,也为数字科普的发展描绘了广阔前景。文章对基于数字技术的科技传播即数字科普文化观念进行了比对、研究,希望在抛砖引玉的同时与大家共同推动数字科普事业的健康发展。 相似文献
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An alternative derivation of the Gordon-Haus effect 总被引:1,自引:0,他引:1
One of the limitations on the achievable data rate of soliton lightwave systems at fixed distance, or on the achievable distance at a fixed data rate, is a timing jitter that is caused by the interaction of the soliton pulses with spontaneous emission noise. An elementary derivation of the Gordon-Haus effect that does not require prior knowledge of any of the more advanced concepts used in the original derivation is presented 相似文献
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The present study examined the country-to-country flow of theatrical films. We hypothesize that a country's level of film imports is influenced by the domestic cinema market size of the exporter, and cultural and linguistic ties between the 2 countries. Regression models tested a dataset drawn from UNESCO's data on annual film imports from major cinema-exporting markets. Results revealed that trade traffic rises with exporters' and importers' home cinema economies, but is lessened by cultural distance between them. The test of the interactional effect of market size and cultural distance, however, reveals that the film flow's cultural discount was significantly moderated by the exporter's market size, which advances the literature. Finally, the flow escalates when both sides speak a common language. 相似文献