Abstract: A system and method for the dynamic distribution of intrusion signatures to aid in protecting a network system from harmful activities. An analysis function includes means for identifying one or more intrusion signatures to be dynamically distributed to an intrusion detection function for monitoring. The analysis function and/or the intrusion detection function may be centralized or distributed. Monitoring may be prioritized, localized, and made operational or non-operational. The intrusion detection function may be embodied in either or both of an appliance and a network forwarding device. The analysis function may distribute the intrusion detection function in addition to the intrusion signatures. In one embodiment of the invention, the system includes an intrusion detection function and a dynamic intrusion signatures function. The intrusion detection function monitors for and reports detected intrusion signatures.

Abstract: A system and method that provides dynamic network policy management. The system enables a network administrator to regulate usage of network services upon initiation of and throughout network sessions. The system employs a method of identifying selectable characteristics of attached functions to establish static and dynamic policies, which policies may be amended before, during and after any session throughout the network based on the monitored detection of any of a number of specified triggering events or activities. Particular policies associated with a particular identified attached function in prior sessions may be cached or saved and employed in subsequent sessions to provide network usage permissions more rapidly in such subsequent sessions. The cached or saved policy information may also be used to identify network usage, control, and security. The system and method of the present invention provides static and dynamic policy allocation for network usage provisioning.

Abstract: Usage of network resources on a communications network is controlled by creating one or more packet rules for analyzing packets received at one or more devices of the communications network, each rule including a condition and action to be taken if a packet received at a device satisfies the condition, and creating one or more service abstractions, each service abstraction representing a named set of one or more of the packet rules. Further, one or more role abstractions may be created, each role abstraction representing a role of a user with respect to the communications network, and each role abstraction including a set of one more packet rules, and possibly one or more service abstractions. These role abstractions and service abstractions may be stored and distributed to network devices on the communications network.

Abstract: A stereoscopic viewer system receives a synchronization signal input from a left-right stereoscopic image pair production system. A viewer system has a transmitter and a modulator associated therewith to transmit into a medium a carrier signal modulated with the synchronization signal. A transmitted signal is received by a receiver which has a demodulator to extract the synchronization signal and to supply it to switching logic. The switching logic supplies switching signals to alternately operate selectively and in accordance with the synchronizing signal each of a pair of electro-optic shutters between the maximum and minimum optical transmission state. Each shutter is positioned in the line of sight of one of the eyes of a user. The system receiving means is powered by a battery power supply.

Abstract: A stereofluoroscopy system has a source of radiation to radiate an object. The source may be one or two x-ray tubes. Conversion means receives radiation from the source and converts it into a composite video signal. The conversion means may include an image intensifier tube associated with a conventional television camera. The composite video signal is received by transmission means which may include switching apparatus and circuitry together with a video storage device to selectively receive even and odd fields for subsequent transmission to display means. The display means includes a television monitor to receive the video signal and a field synchronization detector to detect the video synchronization signal. Means are provided to transmit a synchronization signal to portable electro-optic shutter viewers to be positioned in front of the eyes of the viewer to obtain a three-dimensional stereoscopic view of the television monitor.

Abstract: An optical device, useful for three-dimensional stereo viewing not requir any mechanical shuttering, including two liquid crystal lenses, each comprising: (1) a thin layer of liquid crystal material, preferably nematic liquid crystal; (2) two plates of conductively-coated transparent material enclosing the liquid crystal, each plate being connectable to a source of voltage, and each plate being insulated from the other; (3) a front polarizing sheet forming the outside surface of the crystal lens; and (4) a rear polarizing sheet forming the inner surface of the crystal lens. The axes of polarization of the front and rear polarizing sheets are at right angles to each other, with the result that maximum light transmission through each of the lenses occurs when no voltage is applied across the conductively-coated plates, and minimum light transmission occurs when a voltage is applied across the coated plates.