1115 results about "Control quality" patented technology

A method for transmitting data packets in multiple data flows to/from a mobile station in a mobile communications system. A data transmission path is formed for routing data packets. Multiple profiles are associated with the data transmission path, each profile comprising at least one quality of service parameter, or QoS parameter. Each flow or data packet is provided with a profile tag indicating one of the multiple profiles. Scheduling and policing the transmission of individual data packets is based on at least one QoS parameter of the profile indicated by the profile tag associated with the data flow in question.

Apparatus and method for providing controlled Quality of Service over Ethernet-like links. Prioritised frames are allocated to transmission queues responsive to their priorities. Each queue has an associated subsidiary Ethernet MAC which transmits frames from its queue subject to a scheduler which selects from the set of MAC's according to a pre-determined algorithm. The multiple logical paths between corresponding pairs of transmitter and receiver subsidiary MAC's are preferably multiplexed over a single physical channel. If congestion occurs at the receiver, then Ethernet PAUSE frames may be sent back to the transmitter, directed to specific subsidiary MAC's-typically those with lower priority-to suspend transmission from the corresponding queue for a time period indicated in the PAUSE frame. In this way back pressure flow control may be applied selectively to so that large amounts of low priority traffic do not cause unnecessary delays to higher priority traffic.

To implement more appropriate QoS control by compressing contents data distributed via a network taking into consideration meaning of contents and preferences of users. A network system comprises a content provider that provides content and client that acquires the content. The content provider attaches information on communication priorities to the content based on the content's importance which is determined from the meaning of the content's and sends the content to the client using a protocol which controls quality of service based on the priority and the client receives the content transmitted by the content provider.

An access point is provided which is able to secure QoS of multimedia traffic. In the method of controlling QoS for wireless LAN base station apparatus used in a wireless LAN system operating in accordance with IEEE 802.11 standard, the base station or access point is included in a network working in an infrastructure mode with other mobile stations controlled in access by the DCF function. When the access point is receiving a first frame sent from the mobile station and holds a multimedia frame to be sent with high-priority after having received the first frame, it loads the Duration/ID field of an ACK frame responding to the first frame with a time required for transmitting the multimedia frame, and then sends the ACK frame.

By taking into consideration tool-specific distortion signatures and reticle-specific placement characteristics in an alignment control system, the control quality of sophisticated APC strategies may be significantly enhanced. Respective correction data may be established on the basis of any combinations of tool/reticles and layers to be aligned to each other, which may modify the respective target values of alignment parameters used for controlling the alignment process on the basis of standard overlay measurement data obtained from dedicated overlay marks.

A control system using a genetic analyzer based on discrete constraints is described. In one embodiment, a genetic algorithm with step-coded chromosomes is used to develop a teaching signal that provides good control qualities for a controller with discrete constraints, such as, for example, a step-constrained controller. In one embodiment, the control system uses a fitness (performance) function that is based on the physical laws of minimum entropy. In one embodiment, the genetic analyzer is used in an off-line mode to develop a teaching signal for a fuzzy logic classifier system that develops a knowledge base. The teaching signal can be approximated online by a fuzzy controller that operates using knowledge from the knowledge base. The control system can be used to control complex plants described by nonlinear, unstable, dissipative models. In one embodiment, the step-constrained control system is configured to control stepping motors.

The present invention provides a method of communication using at least one base station and at least one switch. The method includes allocating at least one resource of at least one backhaul connection between said at least one base station and said at least one switch based upon at least one indication of congestion associated with said at least one backhaul connection.

The invention relates to the field of electric power systems, and particularly to a diversified energy automatic generation control method considering wind power acceptance. The method comprises the following steps: classifying units according to different AGC adjustment performances and unit types, and dividing load changing tendencies (rising/declining/stable) by combining with a load prediction result; calculating an area control error ACE of a current region, and defining a zone (dead zone/help zone/secondary emergency zone/emergency zone) which the area control error ACE of the current region belongs to; and adopting different ACG adjustment tactics according to the differences of the load tendencies and ACEs. The method conducts classification on all units; the units match with each other to carry out the water-fire-wind combined automatic generation control; the frequency adjustment ability of a system is fully excavated to lower the frequency regulation reserve of the system; and the purpose of more accepting the wind power output is realized while the control quality is ensured.

The invention discloses a method for coordinating and controlling quality change of coal in a supercritical once-through boiler unit. The method is used for building a boiler master control provided with balanced indirect energy, and comprises the following steps: quantifying coal quantity by load; quantifying primary air quantity by the coal quantity; confirming a dominant role of instructions of the boiler master control; jointly debugging the ratios of wind, water and coal to ensure that the superheat degree of the boiler meets the requirement; meanwhile, ensuring the control precision of the front pressure of the boiler unit to meet the requirements of a power grid for changing range and speed rate. The method mainly solves the problem that the unit runs fast while the boiler efficiency is low, and builds a novel static feedforward, a load dynamic feedfoward, a pressure dynamic feedforward, and dynamic corrections of the feedforwards based on quality change of coal; the linkage of wind, water and coal quickens the responsiveness of the boiler; the joint debugging of water and coal solves the problem of quality change of coal, realizes the decoupling of water and coal and the decoupling of main steam pressure and superheat degree; the linear real-time coefficient modifies various experience curves; and a main steam pressure regulator of the boiler master control is subjected to the variable parameter control.

A system and a method for monitoring and controlling the quality of a culture water are provided. The system includes a plurality of smart culture nodes having integrated water quality analyzers, a culture gateway and a terminal host. In the present method, each of the smart culture nodes detects the quality of the culture water through the integrated water quality analyzer thereof and activates corresponding culture equipments to adjust the quality of the culture water. Besides, the terminal host groups the smart culture nodes through the culture gateway and synchronously controls the smart culture nodes in the same group according to a water quality information collected by the smart culture nodes in the same group so as to activate the corresponding culture equipments to adjust the quality of the culture water. Thereby, the quality of the culture water can be efficiently monitored and controlled.

The invention discloses a method for controlling the quality of ginkgo leaves and an extract thereof. After the screening of a great quantity of experiments, the method adopts ultra-high performance liquid chromatography for detection; and the method can be used for detecting three types of components including flavone, terpene lactones and phenolic acid, twenty-four active compounds in total, in the ginkgo leaves and the extract of the ginkgo leaves. The results of the experiments prove that the method is high in detection sensitivity and good in stability, and can be used for objectively, comprehensively and accurately evaluating the quality of ginkgo leaf medicines, the extract of the ginkgo leaves and ginkgo leaf preparations, thus having important significance on controlling the quality and guaranteeing the clinical treatment effect.

The invention relates to a discrete sliding mode repetitive control method for a periodic servo system, which comprises the following steps: identifying a difference equation model of the current servo system, and converting the difference equation model into a state space model; selecting a linear switching function; forming a discrete reaching law, and constructing an ideal switching dynamic state according to the formed discrete reaching law; constructing a discrete sliding mode repetitive controller model according to the ideal switching dynamic state; and using current control variables as the control command for a controlled servo system to enable the servo system to change with reference signals. The invention can weaken the system chattering, and simultaneously inhibit the influence of periodic disturbance on the system, thereby improving the control quality and realizing the accurate control on periodic tracking tasks.

The invention provides an active disturbance rejection control-based method for controlling synchronization of a photovoltaic power generation system. The photovoltaic power generation system is a non-linear system, influenced by power grid and environment and strongly disturbed by the outside and has nonlinear uncertain factors. According to the work characteristics of the system, the active disturbance rejection control technology is adopted to realize effective control of the system. The system dynamically observes the uncertain factors in the system model and external disturbance by utilizing an extended state observer of an active disturbance rejection controller (ADRC) to ensure that the system has good adaptability to disturbance, can adapt to changes of an object model and the surrounding environment in a large range without influencing the control quality of the controller, and represents well robustness.

A method for scoring and controlling the quality of dynamic food products transitioning in the processing steps is performed using image analysis. An image of a plurality of moving food products on a conveyor system is captured by on-line vision equipment and image analysis is performed on the image via an algorithm that determines the percentage of pixels having varying intensities of colors and applies predetermined preferences to predict consumer dissatisfaction. The entire group of food products of one or more images is given an overall appearance score and each individual food product is also scored such that each may be ranked from least to more acceptable. The ranked food products can then be ejected in the order of worst to better rank to increase the overall quality score of the entire group.

Exemplary embodiments of the invention provide a reference signal generator having a controlled quality (“Q”) factor. An exemplary apparatus to generate a harmonic reference signal includes a reference resonator, such as an LC-tank, which generates a first reference signal having a resonant frequency, and a plurality of reactance modules couplable to the reference resonator. Each reactance module comprises one or more reactance unit cells, and each reactance unit cell comprises a reactance element coupled in series to a switching element. In exemplary embodiments, the reactance element is a capacitor having a predetermined unit of capacitance, and the switching element is a transistor having a predetermined resistance when in an off state. The ratio of capacitance to resistance is substantially constant for all reactance modules of the plurality of reactance modules.

The invention discloses a fuzzy PID adaptive controller design method of an aero-engine based on RBF neural network feedforward and belongs to the aero-engine numerical control system field. The method is used for improving acceleration and deceleration work states of the aero-engine and components under effects of an extraneous condition and internal control so that the engine possesses a good acceleration and deceleration characteristic. The technical scheme is characterized by based on an aero-engine steady state test data sample, using an RBF neural network to carry out off-line training so as to form a feedforward controller; and based on that, adding a fuzzy adaptive PID controller. In the invention, through carrying out acceleration and deceleration control on each state of the aero-engine, the controller possesses a good tracking effect and a good controller parameter online setting capability, control quality of the system in a large range can be further increased and a control difficulty brought by a non-linear characteristic of the engine can be effectively solved.

The invention discloses a control optimizing method for a master controller of supercritical unit boilers. The control optimizing method includes introducing an inertial element F(s) and a lagging element y1 into a feed-forward control branch to replace a modification function My(s) for a main vapor pressure input value ysp which is randomly set by an original system; providing input signals of the lagging element y1 by an element F(s), and leading reference signals yf outputted by the lagging element y1 to act on an input end of a closed-loop control element; and additionally optimizing a transfer function Mu(s) of the feed-forward control branch of an original boiler master control system into a pressure compensation transfer function Mf(s), meeting the requirement of parameter-variable running of a feed-forward function uff of the original boiler master control system, leading the uff and the yf to jointly act on the closed-loop control element, then controlling a follow-up executing mechanism and accordingly realizing master control for the boilers. The control optimizing method has the advantages that the master controller of the boilers can quickly and accurately output instructions to a fuel master controller and a water supply master controller, accordingly a main vapor pressure control effect is guaranteed, response characteristics of load are further ensured, and control quality of the unit and economical indexes are improved.

The invention provides a method and a system for self-adjusting fuzzy PID (Proportion Integration Differentiation) parameters in a furnace temperature control system. The method comprises the following steps: selecting and quantifying variables in a PID controller and finding out a fuzzy relation of three PID control parameters including a proportionality coefficient KP, an integral coefficient KI and a differential coefficient KD , and system deviation e and a deviation varying rate ec; establishing a fuzzy relation table; and carrying out online modification on the three parameters by a fuzzy control method. The system corresponds to the method. After PID parameter online fuzzy self-adjustment is carried out, a normal working state is automatically switched, and a PID parameter adjusting process is automatically started when system performances are changed and the readjusted PID parameters so that the system has the better control quality.

The invention respectively adopts a direct energy balancing mechanism to realize the dynamic decoupling between a steam turbine power regulating loop and a boiler burning regulating loop and a direct mass (flow) balancing mechanism to realize the dynamic decoupling between a steam turbine power regulating loop and a boiler water supply regulating loop, and decouples a usual direct current boiler unit 3*n multi-variable parallel control system onto a decoupling control loop in a hierarchical control structure. The boiler burning regulating loop cancels an usual front side pressure series regulator, and takes the enthalpy increased deviation of an evaporation heated surface of a boiler as the control input; and the boiler water supply regulating loop is designed into fuel-water ratio regulation with a steam turbine power instruction as the input; and the dynamic compensation between boiler burning and water supply is designed. The method best eliminates the coupling impact among all the regulating loops, so that the adjustment is convenient, and the control quality of the direct current furnace unit coordinating control system under the working conditions of variable pressure and variable load is improved.

An audio encoder and decoder use architectures and techniques that improve the efficiency of multi-channel audio coding and decoding. The described strategies include various techniques and tools, which can be used in combination or independently. For example, an audio encoder performs a pre-processing multi-channel transform on multi-channel audio data, varying the transform so as to control quality. The encoder groups multiple windows from different channels into one or more tiles and outputs tile configuration information, which allows the encoder to isolate transients that appear in a particular channel with small windows, but use large windows in other channels. Using a variety of techniques, the encoder performs flexible multi-channel transforms that effectively take advantage of inter-channel correlation. An audio decoder performs corresponding processing and decoding. In addition, the decoder performs a post-processing multi-channel transform for any of multiple different purposes.