5 results about "Active detection" patented technology

The invention discloses a personnel monitoring method and system based on image detection and a wireless probe. The method comprises the following steps: firstly extracting key image information and abnormal information by utilizing a video camera acquisition device and using technologies such as image intrusion detection and object movement detection, and finding a personnel access behavior in amonitored area; then judging identity information and location of an invasion person by utilizing a wireless probe scanning method and adopting a Probe frame active detection technology and an RSSI positioning technology; and finally judging whether an unauthorized person invades a limited area by combining a result obtained by an image detection method. The method disclosed by the invention improves field monitoring recognition precision and efficiency and reduces field operation complexity and equipment cost.

The invention belongs to the technical field of distributed networks, and particularly relates to a node performance detection system and method for a decentralized storage network, and the system comprises a plurality of peer-to-peer network nodes; wherein the network nodes are connected through a point-to-point network. Each node comprises a node detection unit, a random data access unit, a detection response unit, a data statistics recording unit and a control unit. The node detection unit is used for carrying out periodical active detection on accessibility and availability among nodes inthe point-to-point decentralized storage network; and the random data access unit is used for carrying out storage access performance detection among nodes in the point-to-point decentralized storagenetwork, so that distributed detection and updating of node performance are realized.

The invention discloses a photovoltaic grid-connected island detection method based on zero-sequence current injection. The photovoltaic grid-connected island detection method comprises the steps thatan island detection model is built; iabc flowing out of the DC/AC inverter passes through a transformer and then enters a power grid unit for operation; and if the signal relay acts, information is fed back to the DC/AC inverter, the DC/AC inverter is injected into I(0) at the moment, a zero-sequence current value at the PCC is detected, and if the zero-sequence current value at the PCC exceeds aset threshold value, the island state is judged. According to the photovoltaic grid-connected island detection method, the signal relay is used for sending the signal to the photovoltaic power generation unit, so that the problem of relatively high cost of a communication detection method is avoided; only when an alarm starting signal given by the signal relay is received, zero-sequence current disturbance is injected, so that the problem of large blind area of a passive detection method is avoided, and the influence of the active detection method on the electric energy quality is relieved toa certain extent.

The invention discloses an attack identification method. The method comprises the following steps: determining IP information of target equipment according to equipment operation information; constructing a detection packet for the target device, and sending the detection packet to the target device according to the IP information; and receiving a response packet sent by the target device for the probe packet, and determining whether the target device has an attack behavior according to the content of the response packet. By applying the technical scheme provided by the invention, the active detection and identification of the attack organization are realized, and the security of the network equipment is further improved. The invention further discloses an attack recognition device and system and a computer readable storage medium which all have the above beneficial effects.