131 results about "Performance limit" patented technology

A method of vehicle control, in which a global target trajectory is tracked by successively calculating an optimum local trajectory in 4D output space to approach the global trajectory and observe vehicle performance limits and surrounding obstacle clearance. A receding horizon framework is proposed which successively updates the optimum local trajectory according to the current state of the vehicle. Processing overheads can be kept to a minimum by calculating performance limits offline, and optimisation is simplified by using a cost function approach.

In a collision damage reduction system, a microcomputer obtains a first performance limit data of the own vehicle according to the detected speed thereof by a first detecting unit and a second performance limit data of the object according to the relative position data detected by a first detecting unit, the detected speed of the own vehicle and the detected turning angle thereof by a third detecting unit. The microcomputer calculates a total collision probability representing a probability that the own vehicle and the object will collide with each other on a runnable space according to the first performance limit data, the second performance limit data, the detected speed of the own vehicle and the relative position data. In addition, the microcomputer instructs the operation unit to operate at least one of the first operation and the second operation according to the total collision probability.

The present invention provides a multiprocessor system and method in which plural memory locations are used for storing TLB-shootdown data respectively for plural processors. In contrast to systems in which a single area of memory serves for all processors' TLB-shootdown data, different processors can describe the memory they want to free concurrently. Thus, concurrent TLB-shootdown request are less likely to result in performance-limiting TLB-shootdown contentions that have previously constrained the scaleability of multiprocessor systems.

A distortion compensator for compensating for distortion produced in an amplifier that amplifies a signal includes a signal level detector for detecting a level of a signal to be amplified and a distortion compensator for conducting distortion compensation based on the detection result separately for each frequency band signal of multiple frequency band signals contained in the signal to be amplified. The distortion compensator improves distortion compensation performance by reducing the effect of frequency characteristics that restrict the distortion compensation performance limit.

A method for optimized utilization of available energy resources/sources (3) of an electrical system such as for a vehicle generator system. The steps include: determining performance parameters L_Ist (e.g. current I, voltage U, temperature T, power P_D (P_verlust), P_E (P_wirk), efficiency, etc.) of a preferred energy resource (3); entering performance parameters L_Ist (current I, voltage U, temperature T, altitude of the vehicle, etc.) of the energy resource (3) into a thermal model (7); comparing a performance parameter L_Ist of the energy resource (3) with a specified performance limit parameter L_Soll at a specified threshold level; determining a value for an energy reservoir E_Rest of a preferred energy resource (3); and to calculate a remaining time T_Max depending on the energy reservoir E_Rest of a preferred energy resource (3) and using the one or more identified performance parameters L_Ist to maintain an operational state of the vehicle.

A method for testing a set of circuitry in an integrated circuit (IC) is described. The IC includes multiple configurable circuits for configurably performing multiple operations. The method configures the IC to operate in a user mode with a set of test paths that satisfies a set of evaluation criteria. Each test path includes a controllable storage element for controllably storing a signal that the storage element receives. The method operates the IC in user mode. The method reads the values stored in the storage elements to determine whether the set of circuitry is operating within specified performance limits.

The invention provides a method for positioning PU of cognitive radio networks. The method comprises the following steps: acquiring a plurality of detecting results on the PU based on MAC communication protocol through an idle channel capable of perceiving at least three SU of the PU within certain time slot; and based on the plurality of the detecting results in the last step, calculating and determining the position of the PU by an iterative algorithm of weighting least squares. The method has the advantage that the method acquires location algorithm-based positioning precision by utilizing a little information without basing on the location algorithm, and further improves the performance of positioning algorithm by introducing the iterative algorithm of weighting least squares. The deduction of Cramer-Rao theory performance limit and a plurality of imitations prove that the positioning error of the method is extremely similar to Cramer-Rao limit theory performance.

The invention discloses a silicon-based ultraviolet photoelectric detector based on graphene. The silicon-based ultraviolet photoelectric detector comprises an epitaxial silicon substrate, an isolation layer, a silicon window, a top electrode and a graphene thin film which are sequentially laminated, and the epitaxial silicon substrate is provided with a heavily-doped layer and a light-doped layer. The fabrication method comprises the following steps of sequentially planting the isolation layer and the top electrode on the epitaxial silicon substrate after the epitaxial silicon substrate is fabricated, etching the silicon window, and moving the graphene thin film in the silicon window and the top electrode for complete fabrication. An ultra-shallow junction design formed by a graphene/silicon structure is used for improving ultraviolet wave band response; the surface recombination is reduced by epitaxial growth of a thin silicon light-doped structure on an upper surface of the heavily-doped bottom layer, the ultraviolet response is effectively improved, the visible light response is suppressed, and the spectral selectivity detection is achieved; and with the adoption of the high-conductivity graphene thin film, extra ultraviolet light is absorbed, and the ultraviolet sensitivity and the response speed can be improved and are approximate to or even exceed a theoretical performance limit of a traditional silicon-based ultraviolet detector.

The invention provides a three-directional near-isotropy high-performance aluminum alloy cylindrical forge piece manufacturing process. The manufacturing process specifically comprises the following steps of raw material size design, cast ingot quality detection, heating before ingot casting, multi-directional forging, return to a furnace for heating, Z-direction upsetting and punching, return toa furnace for heating, core shaft drawing out, return to a furnace for heating, saddle forging, machining, heating before rolling, ring rolling, solution treatment, aging treatment and quality detection. According to the manufacturing process, an aluminum alloy cylindrical forge piece is subjected to nearly equal deformation in three directions, so that the three-direction performance of a productis nearly isotropic; a thick residual crystalline phase in cast-state structure is fully crushed so as to provide structure preparation for second phase uniform dispersion distribution in the heat treatment process; a second phase in the structure is fully dissolved, the degree of supersaturation is improved, the material potential is excavated to the maximum extent, and the performance limit ofa material is exerted; and the small reduction rate is adopted, the quenching water temperature is increased, the stress in the product manufacturing process is reduced, so that the residual stress ofthe forge piece is controlled within a certain range.

A method and apparatus associated with various phases of a well completion. In one embodiment, a method is described that includes identifying failure modes for a well completion. At least one technical limit associated with each of the failure modes is obtained. Then, an objective function for the well completion is formulated. Then, the objective function is solved to create a well performance limit.

The invention discloses a deep packet inspection method and system based on an initial packet and relates to the technical field of deep packet inspection. According to the deep packet inspection method and system, an initial packet DPI identification mechanism is introduced, by conducting DPI analysis to first multiple packets of a new dialog establishment process, the service application type of the dialog is identified, then based on an identification result and an application processing strategy, a packet filtering rule list is established, then through the packet filtering at two levels, reasonable flow distribution is conducted by means of the functions such as hardware forwarding and packet forwarding, the immediate processing and forwarding of packets are achieved, and it is avoided that all the packets enter into a CPU and a DPI engine for processing, so that equipment performance consumption is reduced, the packet forwarding efficiency is improved, and the method and system are suitable for being achieved in equipment with the performance limited such as a household gateway.

Automatic calibration circuits for operational calibration of critical-path time delays in adaptive clock distribution systems, and related methods and systems, are disclosed. The adaptive clock distribution system includes a tunable-length delay circuit to delay distribution of a clock signal provided to a clocked circuit, to prevent timing margin degradation of the clocked circuit after a voltage droop occurs in a power supply supplying power to the clocked circuit. The adaptive clock distribution system also includes a dynamic variation monitor to reduce frequency of the delayed clock signal provided to the clocked circuit in response to the voltage droop in the power supply, so that the clocked circuit is not clocked beyond its performance limits during a voltage droop. An automatic calibration circuit is provided in the adaptive clock distribution system to calibrate the dynamic variation monitor during operation based on operational conditions and environmental conditions of the clocked circuit.

The invention discloses a performance limited flexible manipulator control method based on determining learning theory. Aiming at the indeterminacy of the dynamic model of the flexible manipulator, the method designs a tracking error to satisfy the limitation of constraint conditions, and forms an error controller. The method in the invention comprises the following steps: building a dynamic model of the flexible manipulator, building a system state observer, designing tracking error performance constraint conditions, designing a neural network controller based on the determining learning theory, and correcting the controller utilizing experiential knowledge. The method designed in the invention can realize the dynamic properties of rapid convergence and low overshoot, satisfy the limitation of set constraint conditions, avoid the on-line regulations to the neural network weights at the same time, and shorten the control time. In addition, the method can utilize the learned experiential knowledge to control the later same task rapidly.

The invention discloses a near space vehicle (NSV) preset performance attitude tracking control method with input nonlinearity. The method comprises the following steps: (1) enabling an input nonlinearity link including a dead zone and input saturation be equivalent to an input saturation link by means of an added dead zone right inverse function, and adding the input nonlinearity to a NSV attitude model; (2) introducing preset performance limit of tracking errors, adjusting the transient performance and the steady-state error of a tracking error signal at the same time, and converting the tracking error signal constrained by preset performance into a unconstrained converted error signal by means of an error conversion function; and (3) constructing an auxiliary system and designing an adaptive neural network attitude tracking controller by means of a backstepping method. The method enables the NSV attitude model to be capable of tracking a desired attitude angle signal with parameter uncertainty, external disturbances, and input nonlinearity.

A system and method provide situational awareness for a pilot of an ownship in managing the longitudinal interval from an aircraft from which the ownship is following and maintaining the ownship within performance limits by displaying an airspeed bar containing markers representing the ownship minimum and maximum airspeeds, the ownship indicated airspeed, and a commanded interval management airspeed (CIMS) for providing speed situational awareness. A flight management system modifies the CIMS in response to a distance between the aircraft and the ownship. An optional pointer attached to the marker representing the CIMS indicates a trend in the in the CIMS.

A system for extending life expectancy of disks in a cloud-based service system and the system using the method are disclosed. The present invention uses LSTM modeling and the k-means clustering algorithms to find out performance limit and target lifespan for a cluster of disks assigned for a specific workload running over the cloud-based service system. The disks can be predicted to have a minimum lifetime and the requirement of the workload can be satisfied. Meanwhile, the minimum lifetime is the longest life the disk can last.

The invention discloses a structural system vulnerability evaluation method based on an ECBN (Explicit Connectivity Bayesian Network). The method aims at the limitations that conventional vulnerability analysis is mainly centralized at a component level and system failure probability reasoning is developed with little consideration to a probabilistic dependency relationship among components. The invention considers a combined effect of various component damages by the ECBN, discloses a root node prior probability evaluation model based on a multi-dimensional performance limit state equation, and strives to really reflect a component damage state and improve evaluation accuracy; the probabilistic dependency relationship among the components is considered by utilizing an analytic hierarchy process, and Bayesian network intermediate node condition probability information is constructed; and the method is particularly practical in a case of shortage of damage data, and finally, implementsreasoning from component vulnerability to structural system vulnerability by a variable elimination algorithm. Insufficient research on vulnerability evaluation of a large-sized engineering structuralsystem is made up, scientific supporting is provided for safety construction and effective operation of the important engineering structural system.

Crosstalk interference induced by the adjacent pairs is one of the major performance limiting factors of DSL systems. As there is a rapid increase in the deployment of DSL services worldwide, the need to provide information about noise related parameters to the operators and the service providers is of utmost importance. Satisfying such a need enables operators to anticipate the line capacity and understand the noise level characteristics of the loop environment. Specifically, crosstalk and more particularly upstream near end crosstalk (NEXT) in the presence of narrowband interference can be classified to isolate the particular service type causing the upstream NEXT. The identification of the service type of the upstream NEXT would enable operators to address the disturber.