<table id="6qg4w"></table> Abstract—In this paper, we propose transform-domain algorithms to effectively classify the characteristics of blocks and estimate the strength of the blocky effect. The transform-domain algorithms require much lower computational complexity and much less memory than the spatial ones. Along with the estimated blocky strength,
標(biāo)簽： transform-domain effectively algorithms Abstract
上傳時間： 2017-06-16
上傳用戶：zukfu
Abstract-In this paper, simple autonomous chaotic circuits coupled by resistors are investigated. By carrying out computer calculations and circuit experiments, irregular self-switching phenomenon of three spatial patterns characterized by the phase states of quasi-synchronization of chaos can be observed from only four simple chaotic circuits. This is the same phenomenon as chaotic wandering of spatial patterns observed very often from systems with a large number of degrees of freedom. Namely, one of spatial-temporal chaos observed from systems of large size can be also generated in the proposed system consisting of only four chaotic circuits. A six subcircuits case and a coupled chaotic circuits networks are also studied, and such systems are confirmed to produce more complicated spatio-temporal phenomena.
標(biāo)簽： investigated Abstract-In autonomous resistors
上傳時間： 2014-06-09
上傳用戶：h886166
Abstract: In battery-powered RF transmitters such as garage door openers and remote keyless entry for cars, as the battery drains,
標(biāo)簽： SM發(fā)射機 電源電壓 發(fā)射功率
上傳時間： 2013-10-23
上傳用戶：nanxia
本文介紹了開關(guān)磁阻電機驅(qū)動系統(tǒng)(Switched Reluctance Drive, SRD)的發(fā)展概況、系統(tǒng)構(gòu)成以及目前的研究熱點。 關(guān) 鍵 詞: 開關(guān)磁阻電機 研究熱點 Abstract:In this paper, development, construction and research focus of Switched Reluctance Drive were introduced. Keywords: Switched Reluctance Motor Research focus 1 發(fā)展簡介 開關(guān)磁阻電機(Switched Reluctance Motor, SRM)最早可以追溯到1970年，英國Leeds大學(xué)步進電機研究小組首創(chuàng)一個開關(guān)磁阻電機雛形。到1972年進一步對帶半導(dǎo)體開關(guān)的小功率電動機(10w～1kw)進行了研究。1975年有了實質(zhì)性的進展，并一直發(fā)展到可以為50kw的電瓶汽車提供裝置。1980年在英國成立了開關(guān)磁阻電機驅(qū)動裝置有限公司(SRD Ltd.)，專門進行SRD系統(tǒng)的研究、開發(fā)和設(shè)計。1983年英國(SRD Ltd.)首先推出了SRD系列產(chǎn)品，該產(chǎn)品命名為OULTON。1984年TASC驅(qū)動系統(tǒng)公司也推出了他們的產(chǎn)品。另外SRD Ltd. 研制了一種適用于有軌電車的驅(qū)動系統(tǒng)，到1986年已運行500km。該產(chǎn)品的出現(xiàn)，在電氣傳動界引起不小的反響。在很多性能指標(biāo)上達到了出人意料的高水平，整個系統(tǒng)的綜合性能價格指標(biāo)達到或超過了工業(yè)中長期廣泛應(yīng)用的一些變速傳動系統(tǒng)。下表是當(dāng)時對幾種常用變速傳動系統(tǒng)各項主要經(jīng)濟指標(biāo)所作的比較。成本 1.0 1.5 1.0 美國、加拿大、南斯拉夫、埃及等國家也都開展了SRD系統(tǒng)的研制工作。在國外的應(yīng)用中，SRD一般用于牽引中，例如電瓶車和電動汽車。同時高速性能是SRD的一個特長的方向。據(jù)報道，美國為空間技術(shù)研制了一個25000r/min、90kW的高速SRD樣機。我國大約在1985年才開始對SRD系統(tǒng)進行研究。SRD系統(tǒng)的研究已被列入我國中、小型電機“八五”、“九五”和“十五”科研規(guī)劃項目。華中科技大學(xué)開關(guān)磁阻電機課題組在“九五”項目中研制出使用SRD的純電動轎車，在“十五”項目中將SRD應(yīng)用到混合動力城市公交車，均取得了較好的運行效果。紡織機械研究所將SRD應(yīng)用于毛巾印花機、卷布機，煤礦牽引及電動車輛等，取得了顯著的經(jīng)濟效益。 從上世紀(jì)90年代國際會議的上有關(guān)SRD系統(tǒng)的文章來看，對SRD系統(tǒng)的研究工作已經(jīng)從論證它的優(yōu)點、開發(fā)應(yīng)用階段進入到設(shè)計理論、優(yōu)化設(shè)計研究階段。對SR電機、控制器、功率變換器等的運行理論、優(yōu)化設(shè)計、結(jié)構(gòu)形式等方面進行了更加深入的研究。
標(biāo)簽： 開關(guān)磁阻電機 發(fā)展 驅(qū)動系統(tǒng) 講座
上傳時間： 2013-10-11
上傳用戶：xjz632
本文利用Verilog HDL 語言自頂向下的設(shè)計方法設(shè)計多功能數(shù)字鐘，突出了其作為硬件描述語言的良好的可讀性、可移植性和易理解等優(yōu)點，并通過Altera QuartusⅡ 4.1 和ModelSim SE 6.0 完成綜合、仿真。此程序通過下載到FPGA 芯片后，可應(yīng)用于實際的數(shù)字鐘顯示中。 關(guān)鍵詞：Verilog HDL；硬件描述語言；FPGA Abstract: In this paper, the process of designing multifunctional digital clock by the Verilog HDL top-down design method is presented, which has shown the readability, portability and easily understanding of Verilog HDL as a hard description language. Circuit synthesis and simulation are performed by Altera QuartusⅡ 4.1 and ModelSim SE 6.0. The program can be used in the truly digital clock display by downloading to the FPGA chip. Keywords: Verilog HDL；hardware description language；FPGA
標(biāo)簽： Verilog HDL 多功能 數(shù)字
上傳時間： 2013-11-10
上傳用戶：hz07104032
Abstract—In the future communication applications, users may obtain their messages that have different importance levels distributively from several available sources, such as distributed storage or even devices belonging to other users. This scenario is the best modeled by the multilevel diversity coding systems (MDCS). To achieve perfect (information-theoretic) secrecy against wiretap channels, this paper investigates the fundamental limits on the secure rate region of the asymmetric MDCS (AMDCS), which include the symmetric case as a special case. Threshold perfect secrecy is added to the AMDCS model. The eavesdropper may have access to any one but not more than one subset of the channels but know nothing about the sources, as long as the size of the subset is not above the security level. The question of whether superposition (source separation) coding is optimal for such an AMDCS with threshold perfect secrecy is answered. A class of secure AMDCS (S-AMDCS) with an arbitrary number of encoders is solved, and it is shown that linear codes are optimal for this class of instances. However, in contrast with the secure symmetric MDCS, superposition is shown to be not optimal for S-AMDCS in general. In addition, necessary conditions on the existence of a secrecy key are determined as a design guideline.
標(biāo)簽： Fundamental Limits Secure Class on of
上傳時間： 2020-01-04
上傳用戶：kddlas
模式識別學(xué)習(xí)綜述.該論文的英文參考文獻為303篇.很有可讀價值.Abstract— Classical and recent results in statistical pattern recognition and learning theory are reviewed in a two-class pattern classification setting. This basic model best illustrates intuition and analysis techniques while still containing the essential features and serving as a prototype for many applications. Topics discussed include nearest neighbor, kernel, and histogram methods, Vapnik–Chervonenkis theory, and neural networks. The presentation and the large (thogh nonexhaustive) list of references is geared to provide a useful overview of this field for both specialists and nonspecialists.
標(biāo)簽： statistical Classical Abstract pattern
上傳時間： 2013-11-25
上傳用戶：www240697738
Abstract—Wireless networks in combination with image sensors open up a multitude of previously unthinkable sensing applications. Capable tools and testbeds for these wireless image sensor networks can greatly accelerate development of complex, yet efficient algorithms that meet application requirements. In this paper, we introduce WiSNAP, a Matlab-based application development platform intended for wireless image sensor networks. It allows researchers and developers of such networks to investigate, design, and evaluate algorithms and applications using real target hardware. WiSNAP offers standardized and easy-to-use Application Program Interfaces (APIs) to control image sensors and wireless motes, which do not require detailed knowledge of the target hardware. Nonetheless, its open system architecture enables support of virtually any kind of sensor or wireless mote. Application examples are presented to illustrate the usage of WiSNAP as a powerful development tool.
標(biāo)簽： combination previously multitude Abstract
上傳時間： 2013-12-03
上傳用戶：D&L37
An abstract of the sis of Andrew Greenberg for the Master of Science in Elec- trical and Computer Engineering presented May 6, 2005.
標(biāo)簽： Greenberg the abstract Computer
上傳時間： 2014-06-16
上傳用戶：z754970244
Abstract—We describe a technique for image encoding in which local operators of many scales but identical shape serve as the basis functions. The representation differs from established techniques in that the code elements are localized in spatial frequency as well as in space.
標(biāo)簽： technique operators Abstract describe
上傳時間： 2014-01-23
上傳用戶：ruixue198909
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