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本文针对输液产品功能单一且缺乏适用于双头输液器的智能控制设备的背景下,设计了一种基于STC89C52单片机软件程序的双药瓶输液监测控速报警系统,该系统通过利用红外感应、步进电机驱动、蜂鸣器报警、电源电路、蓝牙串口通信等模块,实现了滴速检测、滴速控制、自动换瓶、事故报警等功能。并且在实际使用过程中,本系统还可以通过手机端输入目标滴速档位并实现自动调节,有效减轻医护人员工作量的同时保障患者输液安全。 相似文献
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弱面削弱了层状岩体的抗剪强度,在地下采矿活动中会加速矿柱的失稳变形,易导致采场垮塌。为研究含弱面矿柱稳定性,并对矿柱进行稳定性控制,以贵州省紫袍玉矿石地下采场为研究背景,运用矿柱面积承载理论,通过理论计算推导出金属矿山方形矿柱的矿柱安全系数。为减少弱面对矿柱承载强度的影响,采用 FLAC3D数值模拟软件对含弱面矿柱进行锚杆支护研究,结合矿柱安全系数,得出最优锚固支护参数。在矿柱加固的基础上对 200 m 埋深处采场进一步参数优化,最终得出优化方案为选择锚杆间排距 1 200 mm、预紧力 60 kN 的矿柱锚杆支护参数,采场参数为矿房跨度 14 m,矿柱宽度 6 m。同不进行矿柱加固的采场参数优化方案相比,此方案能提高矿石资源回收率,最大限度提升矿山经济效益。 相似文献
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Existing resource recommendation algorithms make resource recommendation based on user preferences, without consider-ing the subjective reluctance of users to personal privacy or the data mining of interests and hobbies, or the risk of privacy disclosureof third-party servers. To solve the problem of user privacy, this paper puts forward the K-anonymous privacy protection algorithm.After the generalization of sensitive attributes of user query requests, it constructs a logical anonymous query request equivalenceclass, uses the method of data rotary to enable users in the same equivalence class to randomly forward the received data from otherusers. Because the privacy attributes that each person wants to protect are different, the weight of its sensitive attribute is different,so this paper proposes the weight summation formula based on the sensitive attribute combined with the sensitive attribute weightvalue set by the user independently, and recommends the optimal selection scheme for the platform user. The security analysis showsthat this method can effectively resist similarity attack, background knowledge attack and capture server attack. Experiments showthat this method not only satisfies the correctness of matching results, but also enhances the privacy protection performance in theprocess of resource recommendation. 相似文献
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