高速公路隧道屬于特殊路段，隧道洞內外環境差別非常大，需要在隧道內設置電光照明，以消除司機的“暗適應&Quot;與“明適應’’視覺問題，保證隧道行車安全。而當前的大部分高速公路隧道照明控制系統簡單，照明光源舒適度不高，未根據洞外環境亮度，綜合車速車流量及洞內煙霧濃度等因素，實時調節隧道洞內照明亮度，存在盲目加大隧道照明的亮度的問題，給行車安全帶來隱患，造成能源浪費，不符合設計規范和國家節能的政策要求。 本文介紹了當前隧道照明的發展及照明燈具智能控制的研究狀況，針對當前隧道照明的控制系統存在的問題，給出了基于ZigBee的隧道照明無線控制系統的 架構；分析比較了當前各種隧道照明光源的特點，針對當前普遍采用的高壓鈉燈照明和新興的LED燈照明做了詳細的經濟效益對比，根據系統使用壽命周期內的性價比，選擇大功率LED作為隧道照明燈具；在分析ZigBee協議及組網流程的基礎上，設計了基于ZigBee技術的簇樹型隧道照明無線測控網絡，系統采用CC2430無線模塊作為網絡節點的硬件解決方案，對網絡中的協調器、路由器及終端節點的組網及其數據處理流程進行了詳細設計；設計了利用ZigBee技術作為控制命令和數據傳輸的可調光LED燈具，滿足所提出的控制系統對燈具的要求：針對隧道照明控制參數及燈具光效難以建立精確數學模型的特點，系統采用基于專家經驗的隧道照明的模糊控制算法，設計了隧道照明控制程序，并嵌入到利用WinCC設計的隧道照明的控制系統中。論文最后對所設計的系統進行了測試，驗證了系統的可行性。
上傳時間： 2013-04-24
上傳用戶：gundamwzc
·詳細說明：VC++視頻開發實例集錦，包括“遠程視頻監控”語音識別系統等13個經典例子。是VC++源碼.文件列表: vc++視頻開發 ............\chap10 ............\......\BDA ............\......\...\bda.dsw ............\......\...
上傳時間： 2013-04-24
上傳用戶：hechao3225
本文論述了狀態機的verilog編碼風格,以及不同編碼風格的優缺點，Steve Golson's 1994 paper, &Quot;State Machine Design Techniques for Verilog and VHDL&Quot; [1], is agreat paper on state machine design using Verilog, VHDL and Synopsys tools. Steve's paper alsooffers in-depth background concerning the origin of specific state machine types.This paper, &Quot;State Machine Coding Styles for Synthesis,&Quot; details additional insights into statemachine design including coding style approaches and a few additional tricks.
標簽： Synthesis Machine Coding Styles
上傳時間： 2013-10-15
上傳用戶：dancnc
Abstract: This application note describes how sampling clock jitter (time interval error or &Quot;TIE jitter&Quot;) affectsthe performance of delta-sigma digital-to-analog converters (DACs). New insights explain the importanceof separately specifying low-frequency (< 2x passband frequency) and high-frequency or wideband (> 2xpassband frequency) jitter tolerance in these devices. The article also provides an application example ofa simple highly jittered cycle-skipped sampling clock and describes a method for generating a properbroadband jittered clock. The document then goes on to compare Maxim's audio DAC jitter tolerance tocompetitor audio DACs. Maxim's exceptionally high jitter tolerance allows very simple and low-cost sampleclock implementations.
上傳時間： 2013-10-25
上傳用戶：banyou
針對準確測量油氣水多相流各分相含量的問題，采用了電容層析成像技術完成油氣水多相流各分相含量測量。通過仿真分析了采用有限元分析方法的電極間的靈敏度特性，探討了測量中的&Quot;軟場&Quot;特性；結合靈敏度的分析，對單元濾波圖象重建進行了仿真對比，得到單元濾波對圖像重建有很大的改善。說明采用電容層析成像技術測量各分相含量的方案是可行的。
上傳時間： 2013-10-15
上傳用戶：hustfanenze
Abstract: Class D amplifiers are typically very efficient, making them ideal candidates for portable applications that require longbattery life and low thermal dissipation. However, electromagnetic interference (EMI) is an issue that commonly accompanies theClass D switching topology. Active-emissions limiting reduces radiated emissions and enables &Quot;filterless&Quot; operation, allowingdesigners to create small, efficient portable applications with low EMI.
上傳時間： 2013-11-23
上傳用戶：哈哈hah
EMC設計中的濾波器通常指由L，C構成的低通濾波器。濾波器結構的選擇是由&Quot;最大不匹配原則&Quot;決定的。即在任何濾波器中，電容兩端存在高阻 抗，電感兩端存在低阻抗。
上傳時間： 2014-12-23
上傳用戶：123啊
限幅放大器信號通道利用多級放大方式&Quot;降低了輸出信號上升:下降時間&Quot;減小了級間驅動能力不匹配對信號完整性的影響#通過負反饋環路消除了信號通道上的偏移電壓&Quot;采用獨特的遲滯技術&Quot;使檢測電路的遲滯對外接電阻變化不敏感!
上傳時間： 2013-11-05
上傳用戶：s藍莓汁
A complete design for a data acquisition card for the IBM PC is detailed in this application note. Additionally, C language code is provided to allow sampling of data at speed of more than 20kHz. The speed limitation is strictly based on the execution speed of the &Quot;C&Quot; data acquisition loop. A &Quot;Turbo&Quot; XT can acquire data at speeds greater than 20kHz. Machines with 80286 and 80386 processors can go faster than 20kHz. The computer that was used as a test bed in this application was an XT running at 4.77MHz and therefore all system timing and acquisition time measurements are based on a 4.77MHz clock speed.
上傳時間： 2013-10-29
上傳用戶：BOBOniu
This application note describes a Linear Technology &Quot;Half-Flash&Quot; A/D converter, the LTC1099, being connected to a 256 element line scan photodiode array. This technology adapts itself to handheld (i.e., low power) bar code readers, as well as high resolution automated machine inspection applications..
上傳時間： 2013-11-21
上傳用戶：lchjng
