本研究目的在於研製一自行車電力管理系統,電力來源主要是透過建構於自行車前輪的發電花鼓以及鋰離子電池進行系統供電。系統負載以自行車車燈、USB(Universal Serial Bus)介面充電器、MMC(Multi Media Card)卡記錄裝置、繪圖型液晶顯...
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本研究目的在於研製一自行車電力管理系統,電力來源主要是透過建構於自行車前輪的發電花鼓以及鋰離子電池進行系統供電。系統負載以自行車車燈、USB(Universal Serial Bus)介面充電器、MMC(Multi Media Card)卡記錄裝置、繪圖型液晶顯示模組和心率表為例。在寬廣的電流負載範圍之間(10mA至600mA),根據不同使用情境判斷並自動切換至各種電源管理機制。另一方面建構同步昇壓、降壓電路。引入電力管理機制,利用省電型單晶片切換工作模式使其達到最大轉換效率,確保有限的電力供應下有最大利用。系統架構採用德州儀器(Texas Instrument)生產之MSP430省電單晶片來實現控制法則。輸入電壓Vrms=4~22V之交流電源,兩組直流電壓輸出Vo1=3.3V、Vo2=5V。昇壓轉換器重載效率92%(Vin=4.5V,Vout=5V,I out=600mA)輕載效率可達70%(Vin=5V,Vout=3.3V,I out=10mA)自行車停駛狀態可供應系統滿載運作一小時之久。並在發電機不同轉速下供應ECG心跳表做信號干擾的比較分析,為系統供應電力及功能進行驗證。
The purpose of this paper is to show the influence of coronary heart failure (CHF) on heart by using different entropies to apply on the group of patients with CHF and normal group. Three different entropies are used:...
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The purpose of this paper is to show the influence of coronary heart failure (CHF) on heart by using different entropies to apply on the group of patients with CHF and normal group. Three different entropies are used: approximate entropy (ApEn), multiscale entropy (MSE), and base-scale entropy (BsEn). We use these three entropies to measure the complexity of the heart rate variability (HRV), and also use analysis of variance (ANOVA) to analyze the result of entropies to discuss the feasibility of recognizing CHF patients by utilizing entropies. With the analysis results of different entropies, the influence of CHF on heart has also been clearly demonstrated.
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