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1285results about How to "Reduce transfer" patented technology

Methods and apparatus for fairly scheduling queued packets using a ram-based search engine

InactiveUS6389031B1Minimizes burstinessMinimize indexData switching by path configurationProcessor registerHierarchical search
A hierarchical searching technique is used to find the first memory location of a calendar queue with a validity bit of "1" (that is, the lowest time stamp). The bit string at any level l (l<> 0) can be stored in a RAM of size glMl-1. The string at the highest level in the hierarchy (l=0) can be stored in an M0 bit register. The number of address bits need to address any bit at a level l may be expressed as:Equation (11) illustrates a method of the present invention for addressing in a hierarchical search. That is, m0 most significant bits of the time stamp address should be used at level 0. Then, at level l, the complete address used at upper level (l-1) will be used to locate the proper gl bit word in its glMl-1 memory. Another log2gl bits following the previous ml-1 bits is extracted from the time stamp address and used to locate the proper bit in the gl bit word that has just been identified. In this way, the search time depends on the number L of levels. Thus, a scheduler based on the present invention can schedule large numbers of flows to be placed on a high speed data link (i.e., with a small time slot). A two (2) dimensional shaper uses a similar hierarchical searching and addressing technique. Finally, any overflow of binary encoded time stamp and system potential values is tracked so that time stamp aging does not cause problems.
Owner:POLYTECHNIC INST OF NEW YORK

Downhole shock absorber for torsional and axial loads

A shock-absorber subassembly for a subsurface drilling assembly is disclosed. The shock-absorber subassembly comprises a mandrel, a body assembly, and at least one torsional spring assembly. The mandrel has a bore extending therethrough and has one end connectable to a portion of the subsurface drilling assembly. The body assembly has a bore extending therethrough and one end connectable to another portion of the subsurface drilling assembly. The body assembly is coupled to the mandrel to establish fluid communication between the bore of the mandrel and the bore of the body assembly and to permit planar rotational movement of the mandrel relative to the body assembly. The at least one torsional spring assembly engages the mandrel and the body assembly to absorb torsional shocks and vibrations between the mandrel and the body assembly and to limit the degree of planar rotation between the mandrel and the body assembly. In a second embodiment, the body assembly is coupled to the mandrel to permit axial movement as well as planar rotational movement. In this second embodiment, the shock-absorber subassembly further comprises at least one axial spring assembly engaging the mandrel and the body assembly to absorb axial shocks and vibrations between the mandrel and the body assembly.
Owner:DIAMONDBACK - QUANTUM DRILLING MOTORS
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