Abstract:
A distributed application system and a method for controlling QoS in data transmission are provided. The distributed application system includes an application hosting device (AHD), a wireless sensor network (WSN) and a gateway. The AHD includes a personal health manage software module, a first application programming interface (API) module and a first communication protocol module. The gateway includes a second API module, second and third communication protocol modules. The WSN, the first and second communication protocol modules support a first communication protocol, and the third communication protocol module supports a second communication protocol. The first API module cooperates with the second API module to accomplish all of default functionalities of a personal network API. The PHD is connected to the AHD via the gateway. When the AHD or the gateway transmits a message to the WSN, the QoS control of the message is performed by setting priority and acknowledge parameters.
Abstract:
An ultrasonic system and an ultrasonic method with adaptive overflow and gain control are provided. The present disclosure uses two-stage gain controls to improve the signal-to-noise ratio (SNR) and to achieve the correct analysis of results. The first stage adopts an analog gain, and monitors whether the signal may overflow or its signal strength is too weak, and adjusts the gain value as large as possible, without causing overflow in order to improve the SNR. The second stage adopts a digital gain. In the second stage, all the amplified gain-containing data adjusted in the first stage are received, and an amplified gain-containing data segment is sequentially retrieved in chronological order, and the amplified gain-containing data segment is converted into a same-gain data segment having the same gain. Finally, the same-gain data segment is provided to a Doppler signal analyzer for analysis.