The contamination diffusion to the operating room when the door is open was simulated with a computational fluid dynamic(CFD) method,to give the extent of the contamination diffusion.The influence of the door-opening ...The contamination diffusion to the operating room when the door is open was simulated with a computational fluid dynamic(CFD) method,to give the extent of the contamination diffusion.The influence of the door-opening procedure was ignored since the door of the operating room is normally a sliding one.The flow field in the case of the 16 s course of opening the door was simulated.The simulated and the experimental results demonstrate that the extent of the contamination diffusion is around 1.5 m when there is no temperature difference between indoor and outdoor,and there is hardly any contamination diffusion when the temperature difference is 1 ℃.It can be concluded that the positive pressure difference in the operating room lost its function in preventing the contamination when the door is open.That the temperature of corridor is lower than that of operating room contributes to contamination control.Keeping 1 ℃ temperature difference between corridor and operating room and increasing positive pressure and air flow are suggested.It is more secure to set up an anteroom if persons come in or out of the operation room at the course of surgery.展开更多
日常生活中使用GPS(global position system)进行定位,但GPS无法在室内工作,准确地进行室内定位成为研究的热点之一。在早期的研究中,围绕Wi-Fi指纹进行了大量的实验与改进,但Wi-Fi指纹受到环境因素制约,定位误差较大。针对这一问题,提...日常生活中使用GPS(global position system)进行定位,但GPS无法在室内工作,准确地进行室内定位成为研究的热点之一。在早期的研究中,围绕Wi-Fi指纹进行了大量的实验与改进,但Wi-Fi指纹受到环境因素制约,定位误差较大。针对这一问题,提出一种多信息融合的室内定位算法。首先通过Wi-Fi指纹进行粗略的定位,获取Wi-Fi接入设备的MAC地址以及其信号强度RSSI(received signal strength indication),通过kNN(k nearest neighbor)算法进行分类,得到top-n候选集。再通过地磁信号与图片信息进行候选集的过滤。最后利用社交信息,给出人在室内的最终定位结果。在Android平台和服务器上对该系统进行验证,实验结果表明提出的多信息融合的方法比Wi-Fi指纹的定位算法精度明显提高。展开更多
文摘The contamination diffusion to the operating room when the door is open was simulated with a computational fluid dynamic(CFD) method,to give the extent of the contamination diffusion.The influence of the door-opening procedure was ignored since the door of the operating room is normally a sliding one.The flow field in the case of the 16 s course of opening the door was simulated.The simulated and the experimental results demonstrate that the extent of the contamination diffusion is around 1.5 m when there is no temperature difference between indoor and outdoor,and there is hardly any contamination diffusion when the temperature difference is 1 ℃.It can be concluded that the positive pressure difference in the operating room lost its function in preventing the contamination when the door is open.That the temperature of corridor is lower than that of operating room contributes to contamination control.Keeping 1 ℃ temperature difference between corridor and operating room and increasing positive pressure and air flow are suggested.It is more secure to set up an anteroom if persons come in or out of the operation room at the course of surgery.
文摘日常生活中使用GPS(global position system)进行定位,但GPS无法在室内工作,准确地进行室内定位成为研究的热点之一。在早期的研究中,围绕Wi-Fi指纹进行了大量的实验与改进,但Wi-Fi指纹受到环境因素制约,定位误差较大。针对这一问题,提出一种多信息融合的室内定位算法。首先通过Wi-Fi指纹进行粗略的定位,获取Wi-Fi接入设备的MAC地址以及其信号强度RSSI(received signal strength indication),通过kNN(k nearest neighbor)算法进行分类,得到top-n候选集。再通过地磁信号与图片信息进行候选集的过滤。最后利用社交信息,给出人在室内的最终定位结果。在Android平台和服务器上对该系统进行验证,实验结果表明提出的多信息融合的方法比Wi-Fi指纹的定位算法精度明显提高。
