Abstract: Methods and apparatus for enabling collaboration with web pages and other resources is described. A method includes the step of establishing a collaboration session between a first client and a second client. A requested resource is cached with the session host in response to a request having a first uniform resource locator (URL) issued by the first client, if the requested resource is a pre-determined type of resource. A second URL is provided to the second client. The second URL identifies the requested resource or the cached resource in accordance with whether the requested resource is cached. Apparatus for enabling collaboration includes a web server, a cache, and a filter. The web server provides a requested web page in response to a first client's request. The filter stores the requested web page in the cache, if the requested web page is a pre-determined type of web page. A number of pre-determined characteristics for caching are described in various embodiments of the methods and apparatus.

Abstract: Methods and apparatus for enabling collaboration between clients with respect to dynamic resources are described. The method includes the step of establishing a collaboration session between a first client and a second client through a session host. A first client request having a first uniform resource locator (URL) identifying a host other than the session host is re-directed through the session host. In one embodiment, the retrieved resource is modified such that for each embedded request identifying a host other than the session host, its associated embedded URL is replaced with a re-directed URL incorporating the embedded URL. The re-directed URL re-directs the corresponding request for a resource identified by the embedded URL through the session host. In an alternative embodiment, the retrieved resource is not modified. In either embodiment, the resulting resource is cached if necessary (e.g., when the resource is dynamic).

Abstract: A neural network based system, method, and process for the automated delineation of spatially dependent objects is disclosed. The method is applicable to objects such as hydrocarbon accumulations, aeromagnetic profiles, astronomical clusters, weather clusters, objects from radar, sonar, seismic and infrared returns, etc. One of the novelties in the present invention is that the method can be utilized whether or not known data is available to provide traditional training sets. The output consists of a classification of the input data into clearly delineated accumulations, clusters, objects, etc. that have various types and properties. A preferred but non-exclusive application of the present invention is the automated delineation of hydrocarbon accumulations and sub-regions within the accumulations with various properties, in an oil and gas field, prior to the commencement of drilling operations.

Abstract: A technique for providing coarse and fine switching on digital-to-analog converter output for a more refined analog output signal. In a digital-to-analog converter utilizing a switched capacitor low-pass filter, the last stage of the filter implements a two phase charging scheme to ensure distortion reduction.

Abstract: A technique for detecting and suppressing overload conditions in an analog-to-digital converter which uses a delta-sigma modulator. In order to prevent overloading in modulator, a detection unit is used to detect a preset amplitude level associated with an input signal and when such level is detected, the performance of the modulator is degraded in order to prevent the overload condition from occurring. The degrading is achieved by changing the coefficients of operation of the integrator(s) in the modulator.

Abstract: A technique for resetting state variables of a delta-sigma modulator of an analog-to-digital converter. A switched capacitor impedance is placed in the reset feedback path of an integrator to ensure that the integrator tracks to the proper reset voltage, when reset is initiated in a third-order or higher delta-sigma modulator.