摘要:
A plurality of computer nodes communicate using seemingly random Internet Protocol source and destination addresses. Data packets matching criteria defined by a moving window of valid addresses are accepted for further processing, while those that do not meet the criteria are quickly rejected. Improvements to the basic design include (1) a load balancer that distributes packets across different transmission paths according to transmission path quality; (2) a DNS proxy server that transparently creates a virtual private network in response to a domain name inquiry; (3) a large-to-small link bandwidth management feature that prevents denial-of-service attacks at system chokepoints; (4) a traffic limiter that regulates incoming packets by limiting the rate at which a transmitter can be synchronized with a receiver; and (5) a signaling synchronizer that allows a large number of nodes to communicate with a central node by partitioning the communication function between two separate entities.
摘要:
An apparatus for delivering an implant within a lumen or passageway is provided. The apparatus comprises a flexible, hollow outer member having an elongated section that is inserted into and navigated through the lumen of passageway. The implant is mounted within the distal end of the elongated section. An elongated fluid chamber is defined within the outer member between two valves or seals. The valves or seals permit fluid flow in a pre-determined direction during loading of fluid into the chamber, but prevent fluid to exit the chamber during deployment of the implant. A shaft is in contact with the proximal end of the fluid column. During deployment, the shaft is held in a fixed position and the outer member actuated in a proximal direction. The implant exerts compressive forces on the outer member as it is actuated proximally. These forces are transmitted to the fluid column which resists buckling.
摘要:
A method for pre-loading an implant delivery apparatus and for delivering an implant is provided. An implant is mounted within the distal end of an elongated section of a delivery apparatus. After the implant is mounted within the elongated section, fluid is drawn into a chamber within the delivery apparatus that is proximal to the implant. This is accomplished by drawing fluid, such as a biocompatible liquid, into the chamber by applying pressure to a port. The fluid is trapped inside the chamber forming a liquid column. The elongated section is advanced through a lumen or passageway delivering the implant to a desired location. A shaft, which is in communication with the fluid column, is held stationary and the elongated section retracted deploying the implant. As the elongated section is retracted, the implant exerts forces upon the elongated section that are transmitted to the fluid column which resists buckling.
摘要:
A bi-directional braking assembly for a vehicle includes a hydraulic booster assembly for applying proportional fluid pressure to a brake assembly and is actuated by a forward pedal. A master cylinder actuated by a rear pedal communicates fluid to the hydraulic booster assembly through a hydraulic booster valve. The hydraulic booster valve includes a piston movable to regulate hydraulic pressure in response to actuation of first and second plungers. The second plunger is movable along an axis separate from the first plunger in response to actuation of a master cylinder by a rear pedal. The master cylinder provides pressure to the booster valve assembly that acts on an area between the first and second plunger assemblies to move the second plunger away from the first plunger to actuate and move the booster piston within the valve.
摘要:
A hydraulic master cylinder having a cylinder body (1) with a piston (3) slidable therein. The piston carries a sealing assembly (20) to permit pressurization of a pressure chamber (6) and fluid recuperation upon retraction of the piston. The sealing assembly includes a first seal (23) of relatively hard material slidable against the internal cylinder wall and a relatively resilient second seal (25) arranged to act between the sealing surfaces of the piston and the first seal to provide a fluid tight pressure seal during pressurization of the chamber.
摘要:
An electric furnace for heating glass by the Joule effect comprising: a chamber adapted for holding a body of molten glass; a plurality of electrodes positioned in the chamber such that the electrodes form a zone with two clusters of electrodes in the zone, the clusters being located on opposite sides of the chamber, each of the clusters comprising first and second sets of electrodes, the first set being positioned closer to the other cluster than the second set and the first and second sets being positioned such that the second set of electrodes carries at least 60% of the current carried by the first set; and a source of power connected to the clusters.
摘要:
A furnace contains a plurality of zones. Each zone has at least one electrode adjacent a separate electrode of an adjoining zone. The adjacent electrodes are connected to separate power supplies, specifically separate windings of a transformer. In this manner, zones can be arranged immediately adjacent each other while minimizing current paths between non-associated electrodes to substantially zero. It is therefore, unnecessary to otherwise widely space firing zones within a furnace, and the spacing within the furnace may be filled with closer adjacent firing zones.
摘要:
In one embodiment, a method includes generating a Domain Name Service (DNS) request comprising a domain name, determining that the DNS request corresponds to a first computer configured to communicate securely, and sending, based on the determination, a request to establish a communication link with the first computer configured to communicate securely, the request including an identifier of a client device used to determine whether the client device is authorized to communicate with the first computer. The method includes receiving, in response to the request to establish the communication link, a resource used to establish the communication link, wherein the resource corresponds to a qualify of service level for the communication link, determining, in response to the request to establish a communication link, whether a software module for communicating securely requires installation on the client device, and if it is determined that the software module requires installation on the client device: accessing a network address for downloading the software module, downloading the software module, and installing the software module on the client device. The method also includes automatically establishing the communication link having the quality of service level using the received resource communicating securely with the first computer over the established communication link having the quality of service, wherein the communication link passes through one or more intermediate devices that provide anonymity of at least one of the client device and the first computer, and client device is a user device.
摘要:
A network device comprises a storage device storing an application program for a secure communications service, and at least one processor configured to execute the application program for the secure communications service so as to enable the network device to send a request to look up a network address of a second device based on an identifier associated with the second device, receive an indication that the second device is available for the secure communications service, the indication including the requested network address and provisioning information for a secure communication link, connect to the second device over the secure communication link, using the received network address of the second device and the provisioning information for the secure communication link, and communicate at least one of video data and audio data with the second device using the secure communications service via the secure communication link.
摘要:
A network device comprises a storage device storing an application program for a secure communications service, and at least one processor configured to execute the application program for the secure communications service so as to enable the network device to send a request to look up a network address of a second device based on an identifier associated with the second device, receive an indication that the second device is available for the secure communications service, the indication including the requested network address and provisioning information for a secure communication link, connect to the second device over the secure communication link, using the received network address of the second device and the provisioning information for the secure communication link, and communicate at least one of video data and audio data with the second device using the secure communications service via the secure communication link.