摘要:
An exemplary method of managing secure communications between nodes includes receiving a public key of a node associated with a certification authority. A root node certificate is provided to the node responsive to the received public key. The root node certificate indicates that the received public key belongs to the node. A root self-signed certificate corresponding to a public key of the certification authority is also provided to the node.
摘要:
A multiprocessor configuration includes a plurality of processing groups connected to form both a first and second communication path, and an interpath connection connecting the first and second communication paths. The first and second communication paths and the interpath connection provide allow communication between processors in different processing groups even if one processing group fails and, thus, creates a discontinuity in both the first and second communication paths. One or more processors in each processing group may be operable to perform fault recovery in response to a detected failure in another processing group.
摘要:
A wideband code division multiple access (CDMA) communication system overlayed on an IS-95 network generates two or more digital bit streams from a group of wideband digital data streams, each digital bit stream spread to form a CDMA component signal. Each CDMA component signal is combined with a corresponding IS-95 digital bit stream to form a composite CDMA signal, allowing a base station to share transmitter subsystems between the wideband and IS-95 systems. For up to three carrier frequencies, up to three composite CDMA signals are employed. A digital bit stream for a group of summed user conversations in the IS-95 system modulates a respective RF carrier frequency to generate a low-power RF signal. The CDMA component signals of the wideband CDMA system are generated so each has a chip rate identical to the chip rate of the digital bit streams of the IS-95 system. The baseband digital data streams for all wideband user conversations are summed digitally for each targeted RF carrier frequency to produce the composite wideband digital signal for each targeted frequency. In one application, each composite wideband digital signal, each at the IS-95 chip rate, is then used to modulate a carrier frequency which is either the same, or has approximately the same frequency and phase as the carrier frequency used in the IS-95 system. Three low-power RF signals are produced in the wideband system, each having the same spectral characteristics as the corresponding low-power RF signals generated in the IS-95 system. These low-power RF signals at the same frequency are combined into a single signal provided to the amplifier and antenna subsystem of a base station transmitter. In another application, each composite digital signal is digitally combined with a respective IS-95 digital bit stream prior to modulation by respective RF carrier. Therefore, signal combining between the IS-95 and wideband CDMA portions of a base station system is accomplished either digitally or with RF signals prior to amplification, thereby allowing the IS-95 system and wideband CDMA system portions of the base station to share RF filters, amplifiers and antennas of the base station transmitters.
摘要:
A method and system recover from a failure of an operational software program. A second software program which is known to function properly and is capable of downloading an updated copy of operational software is stored on the computer with the first software program. The second software program is a boot program which monitors resets of the first software program, determines if the number of resets which have occurred without the operational software first having reached a set operating point (such as establishing communication with a remote computer) reaches a threshold, and preempts operation of the first software program when the threshold is reached.
摘要:
A technique for updating the software in a remote computer (e.g., a base station, a spacecraft in space, an electronic postage meter in an office, a medical monitoring device in a patient's home, etc.) from a central control (e.g., a wireless switching center, the National Aeronautics and Space Administration's Houston Control, a postage meter facility, a medical equipment manufacturer's factory, etc.) is disclosed. An illustrative embodiment of the present invention comprises: checking the integrity of a first software application at a first location in a first memory that is pointed to by a first address in a pointer; copying the first software application from the first memory to the second memory and executing the first software application from the second memory, when the integrity of the first software application is nominal; transmitting a first message indicating that the integrity of the first software application is not nominal, when the integrity of the first software application is not nominal; and receiving a first command to store a second address in the pointer, in response to the first message.
摘要:
The invention provides analogues of .alpha.-1-antichymotrypsin having amino acid substitutions at position 358. .alpha.-1-antichymotrypsin analogues having amino acid substitutions at positions 356-361 and analogues having amino acid substitutions at positions 356-361 wherein the amino acid at position 358 is substituted are also within the scope of the invention. These analogues exhibit chymase inhibitory activity. Also provided are novel .alpha.-1-antichymotrypsins having an N-terminal extension of methionine-alanine-serine or alanine-serine. Expression vectors for the production of .alpha.-1-antichymotrypsins are also provided. The present invention also provides host cells and cell cultures capable of expressing analogues of .alpha.-1-antichymotrypsin, as well as protein preparations from the host cells. Methods of producing and using the analogues of .alpha.-1-antichymotrypsin to inhibit chymase activity are also provided.
摘要:
The present invention provides an analogue of human .alpha.-1-antichymotrypsin wherein the amino acid at position 358 is selected from the group consisting of isoleucine, valine, alanine, aspattic acid, threonine, and glutamic acid.
摘要:
A method of producing a recombinant serine protease inhibitor capable of effectively modulating serine protease activity is provided. Compositions capable of modulating serine protease activity and use of such compositions to regulate inflammatory processes in cells are also provided.
摘要:
The invention provides .alpha.-1-antichymotrypsin and protein preparations comprising human .alpha.-1-antichymotrypsin produced by E. coli cells transformed with a DNA sequence encoding human .alpha.-1-antichymotrypsin. The invention also provides methods for producing .alpha.-1-antichymotrypsin. The invention further provides analogues of .alpha.-1-antichymotrypsin that exhibit antichymotrypsin, anti-trypsin and anti-thrombin activity and methods of producing the analogues.
摘要:
The invention provides .alpha.-1-antichymotrypsin and protein preparations comprising human .alpha.-1-antichymotrypsin produced by E. coli cells transformed with a DNA sequence encoding human .alpha.-1-antichymotrypsin. The invention also provides methods for producing .alpha.-1-antichymotrypsin. The invention further provides analogues of .alpha.-1-antichymotrypsin that exhibit antichymotrypsin, anti-trypsin and anti-thrombin activity and methods of producing the analogues.