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RFID tag

An RFID tag includes an external power input unit, first antenna unit, first power supply unit, memory unit, and control unit. The external power input unit inputs external power. The first antenna unit receives power from a communication device. The first power supply unit extracts power from the radio wave received by the first antenna unit. The control unit operates upon receiving power from the first power supply unit and controls permission and inhibition of access from the communication device to the memory unit in accordance with presence / absence of input of power from the external power input unit.
Owner:NEC CORP

Wireless communications within a process control system using a bus protocol

An apparatus provides wireless communication between multiple devices within a process control system, such as between field devices, control units, user terminals, controllers, etc., using a wireless bus protocol. In one embodiment, a process control system for use within a process control environment includes a plurality of process control field devices that operate within the process environment, and a control device adapted to receive a sense signal from or to provide a control signal to one or more of the plurality of process control field devices. First and second wireless transceivers are communicatively connected to different ones of the process control field devices and the control device and communicate with one another using a bus protocol, to thereby provide wireless communications within the process control system.
Owner:FISHER-ROSEMOUNT SYST INC

Filtering and Policing for Defending Against Denial of Service Attacks on a Network

Described are computer-based methods and apparatuses, including computer program products, for filtering and policing for defending against denial of service attacks on a network. A data packet is filtered by a multi-tiered filtering and transmission system. Data packets matching the first tier filter are discarded. Data packets matching the second tier filter are transmitted to an output module based on a criterion. Data packets in the third tier filter are hashed into bins and data packets matching an entry in the bin are transmitted to the output module based on a criterion for the bin. Data packets in the fourth tier transmission system are transmitted to the output module based on a criterion. Data packets that do not meet the criterion for transmission to the output module are transmitted to an attack identification module which analyzes the data packets to identify attacks.
Owner:RIBBON COMM OPERATING CO INC
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