畢業(yè)設計 USB TO Gigabit LAN 網(wǎng)卡 隨著網(wǎng)絡技術飛速發(fā)展，多媒體的應用越來越多，人們對網(wǎng)絡的要求也越來越高，為了適應市場的需求，網(wǎng)卡出現(xiàn)了。它以其結構簡單、成本低廉、兼容性強等諸多的優(yōu)越性得到了廣泛的應用。由于網(wǎng)絡的應用越來越廣泛，網(wǎng)卡的應用也越來越多、功能越來越強大。開始時由于技術方面的限制，網(wǎng)卡只有10Mbps的吞吐量，由于網(wǎng)絡技術的發(fā)展，100Mbps吞吐量的網(wǎng)卡開始在市場上得到廣泛的應用。而現(xiàn)在1000Mbps吞吐量的網(wǎng)卡的出現(xiàn)又給網(wǎng)絡的傳輸帶來了新的活力。 論文中主要闡述了基于以太網(wǎng)的USB TO Gigabit LAN網(wǎng)卡的設計與制作。論文首先對以太網(wǎng)進行了介紹，緊接著講了網(wǎng)卡的基本知識。隨后又對USB TO Gigabit LAN網(wǎng)卡的電路設計和制作進行了詳細的描述。論文還包括了USB TO Gigabit LAN網(wǎng)卡的調試等內容。
將現(xiàn)行的供暖計費方式由按建筑面積計費變?yōu)榘聪牡臒崮苡嬞M是供暖計費方式發(fā)展趨勢，為了滿足這一計費方式變化的需要，設計了基于IC卡的預付費式新型供暖計費系統(tǒng)，通過測量用戶采暖系統(tǒng)進出口的溫度和流量，計算用戶消耗的熱能，利用IC卡記錄用戶預付費的金額和當年熱能的單價，根據(jù)熱能消耗和當年熱能的單價計算用戶采暖費，根據(jù)實際發(fā)生的供暖費用和預付費金額控制供暖的開停，這一計費方式的變化使供暖計費更趨合理。
Abstract:
It is trend that the mode of heat charging is changed from billing by building area to by thermal energy. In order to meet the needs of heat charging mode changing， a new system of heat charging based on IC card is proposed. The user?蒺s energy consumption is calculated by measuring the user inlet and outlet temperature and flow，using the IC card to record the prepaid amount and the current price of heat. The user?蒺s heating costs is calculated according to energy consumption and current price， according to actual heating costs and prepaid amount，the system controls the heating opening or stopping. It is more reasonable that calculated heating costs by user heat consumption
