摘要:
Wheel type electronic sheet material area measuring machine has means arranged to emit a test start signal, which may be manually operated or automatically operated at a particular stage in the machine cycle, and test means actuated by the signal which cause all of the detecting means of the machine to emit a signal normally indicating presence of sheet material for a predetermined period of such a length that, in the normal operation of the machine, the signalling means of each wheel should generate at least one pulse. Should a pulse not be received from one of the wheels in the allowed time, a signal is given indicating that the machine is faulty. The invention includes means to indicate which of the arm and wheel assemblies is faulty.
摘要:
Electronic wheel-type area measuring machine has manual or automatic operating means, arranged to emit, at a predetermined point in the machine cycle, a test start signal, the operating means includes test means, which upon receipt of the test start signal, feeds signals to computing means of the machine until the computing means registers a predetermined number whereupon a stop signal is emitted. The test means has duplicate computing means which also receives the test signals until the stop signal is emitted, whereupon the number of signals received by the duplicate computing means is compared with the predetermined number and an alarm signal is given if the number recorded by the duplicate computer means differs by more than a predetermined tolerance from the predetermined number. The counter check system also preferably provides a visual test on a visual test display unit and an output printer.
摘要:
Wheel type electronic sheet material area measuring machine comprises means for emitting a test start signal, operated either manually or automatically at a particular point in the machine cycle, and test means actuated by the test start signal to cause material detecting means associated with each wheel to emit a signal normally indicating presence of sheet material for a predetermined length of travel of a conveyor surface on which the material is normally supported, the wheels running on the conveyor surface. Thus each of the signalling means associated with the wheels should, if the machine is operating correctly, emit a number of test signals. The signals emitted by the signalling means of each wheel of a group of wheels are added and compared with an acceptable range of numbers of test signals which would be emitted in respect of that group if the machine is functioning within the predetermined tolerances. A warning is given if any of the groups of wheels are not within the predetermined tolerances and the machine is prevented from measuring area until functioning correctly. Preferably similar tests are run in respect of small groups of wheels e.g. ten and in respect of a group consisting of all the wheels, e.g. overall machine accuracy.
摘要:
Unauthorized wireless access points are detected by configuring authorized access points and mobile units to listen to all wireless traffic in its cell and report all detected wireless devices to a monitor. The monitor checks the reported devices against a list of authorized network devices. If the reported wireless device is not an authorized device, the monitor determines if the reported device is connected to the network. If the reported device is connected to the network and is not an authorized device, the monitor alerts the network operator or network manager of a rogue device connected to the network and attempts to locate and isolate the rogue device.
摘要:
The present invention allows any number of mobile units to roam between a large numbers of sub-networks, each with a large number of access points (tens of thousands or more total access points), with minimal direct administration effort. A hierarchy of management servers may be used across the multiple sub-networks, which can be under the control of multiple entities. The invention provides the capability for the mobile units to authenticate the access points associated with, to ensure they are both authorized and managed. Peer-to-peer and ad hoc associations between mobile units are managed as well. The invention may enforce a number of association policies such as, for example, forcing the mobile unit to only associate with access points or mobile units on a previously set mandatory association list, providing the mobile unit with a list of preferred access points to associate with, but allowing association with other access points, or providing the mobile unit with a excluded association list of access points or mobile units it is not to associate with.
摘要:
A system for enforcing configuration requirements for hardware and software on mobile units operating on Wireless Local Area Networks (WLAN). The system allows the configuration policy to change dynamically with the access point or sub-network association. Whenever a mobile unit connects to a new sub-network or access point, the system invokes and then verifies the proper configuration profile for that sub-network or access point. Thus the system ensures the configuration of the mobile unit meets the requirements for the sub-network being used.
摘要:
A system and method are disclosed that overcome deficiencies of prior art IEEE 802.11 WEP key management schemes. Preferred embodiments of the present system and method update WEP keys and rotate transmission key indices in a synchronized manner and on a frequent basis making it impractical for a hacker to gather sufficient network traffic using any one WEP key to decrypt that key and without disrupting communications. Preferred embodiments of the present system and method do not require changes in access point or mobile unit hardware, radio drivers, or firmware and are therefore compatible with existing or legacy network infrastructure or components. The disclosed system and method may be used to facilitate secure communications between one or more access points and one or more mobile units and/or groups of two or more mobile units engaging in peer-to-peer associations.
摘要:
A hydraulic damper has a rotor (38) with vanes (36) sweeping through respective working chambers (56, 54) defined by a stator ring (12) with integral stator abutments (50). An orifice (64) is formed in each vane to permit flow past each vane which has reduced temperature dependence. Valves (66) in the vanes open at excessive torque. One stator abutment (50) is hollowed to enable overall dimensions of the damper to be reduced. In one embodiment the hollowed stator abutment receives a spool valve (70) enabling replenishment of the working chambers when at low pressure. In other embodiments the hollowed stator abutment accommodates the other torsion bar spring of a pair, so enabling the spring spacing to be reduced.
摘要:
A mobile field system comprises a service center that is connected to the office of a field service organization and number of customers of the field service organization via the Internet or another computer network. The service center is also connected to the mobile systems of technicians who work for the field service organization by a mobile communications system such as a wireless Internet service provider. One or more message queues may be used to increase the reliability of communications between the systems. By using such a queue, messages may not be lost and the communications can be made transparent to the user of the remote system.
摘要:
A system and method are disclosed that overcome deficiencies of prior art IEEE 802.11 WEP key management schemes. Preferred embodiments of the present system and method update WEP keys and rotate transmission key indices in a synchronized manner and on a frequent basis making it impractical for a hacker to gather sufficient network traffic using any one WEP key to decrypt that key and without disrupting communications. Preferred embodiments of the present system and method do not require changes in access point or mobile unit hardware, radio drivers, or firmware and are therefore compatible with existing or legacy network infrastructure or components. The disclosed system and method may be used to facilitate secure communications between one or more access points and one or more mobile units and/or groups of two or more mobile units engaging in peer-to-peer associations.