83 results about "Negative deviation" patented technology

A computer program product and method for sales forecasting and adjusting a sales forecast for an enterprise in a configurable region having one or more clusters of stores. The method includes periodically receiving a sales forecast for an enterprise over a configurable period of time, periodically receiving actual sales information, sales anomalies and anticipated events within the at least one of the clusters of stores over a computer network, determining positive and negative deviations from the anticipated sales of the sales forecast based on the sales information, determining whether one or more trends are occurring or have occurred using a pre-defined mathematical expression based on the sales information, the positive and negative deviations, and the sales anomalies, adjusting the anticipated sales of the sales forecast based on the sales anomalies, the trends and the anticipated events, and outputting the adjusted sales forecast to a user. The sales forecast includes anticipated sales for a plurality of items within at least one of the clusters of stores.

The invention relates to a wind electricity power prediction error evaluation method in consideration of a load level and wind speed segments. The wind electricity power prediction error evaluation method in consideration of a load level and wind speed segments includes: performing data processing on a wind electricity power prediction result reported by a wind farm according to a set data processing method; calculating wind electricity power evaluation indexes according to the wind electricity power prediction result, wherein the wind electricity power evaluation indexes include an accuracy rate, a qualification rate, a reporting rate, a correlation coefficient, a load peak positive deviation rate, a load valley negative deviation rate, a high-speed segment prediction accuracy rate and low-speed segment prediction accuracy rate; according to the wind electricity power evaluation indexes and index weights corresponding to respective wind electricity power evaluation indexes, calculating a comprehensive evaluation parameter of the wind electricity power prediction result; and evaluating the wind electricity power prediction error of the wind farm according to the comprehensive evaluation parameter. The method can realize the comprehensive evaluation of the wind electricity power prediction result and improves corresponding evaluation accuracy.

System and method for image improvement comprising providing a series of frames; summing pixel values to obtain frame intensity; computing average frame intensity; determining frame intensity deviation for each frame by subtracting average frame intensity from frame intensity; determining an array of average pixel values (AAPV) and subtracting AAPV from the pixel value arrays to determine positive or negative pixel deviation values; grouping frames in first or second groups depending positive or negative frame intensity deviation; selecting all pixel values having a positive or negative deviation value and creating subgroups of positive or negative pixel deviation value frames, multiplying the pixel deviation value frames in each subgroup by frame intensity deviation to create first product arrays, which are summed together and divided by total number of frames to obtain second product arrays for each subgroup; selecting one or more of second product arrays to generate an image.

The invention belongs to the field of electric power system dispatching, and discloses a water-fire-electricity system trans-provincial peak-regulating load distribution method. According to the water-fire-electricity system trans-provincial peak-regulating load distribution method, the method is based on the characteristics of load changes of a plurality of provincial level power grids, a load sequencing strategy is brought in, and each power grid load sequencing position of time frames serves as heuristic information to conduct force output distribution. According to the technical scheme of the water-fire-electricity system trans-provincial peak-regulating load distribution method, the initial electricity receiving and force output process of each power grid is acquired through successive load shedding, output force of the time frames corresponding to all grids is accumulated, a time frame set going against the power station electric power balance limit is confirmed; as to any output force positive deviation time frame, a power grid with the maximum surplus load order position value is searched, the power output force of the grid at the time frame is further reduced, and meanwhile a negative deviation time frame with the maximum surplus load value is confirmed; the output force of the time frame is increased according to the same amplitude, and the force output process is repeated until all time frames satisfy the electric power balance limit. According to the water-fire-electricity system trans-provincial peak-regulating load distribution method, a target function does not need to built, the amount of optimizing calculation is substantially reduced, an optimizing result satisfying actual engineering requirements can be fast acquired, and the method is achievable, and has important theoretical and practical significance in regulating and controlling large power grid electricity resource distribution and relieving increasingly-serious power peak regulation pressure.

The invention discloses a production technology of building sheets, comprising the following steps: (1), taking the magnesium oxychloride cement board as ground mass, coarse sanding on the right side and back side of the magnesium oxychloride cement board by a sanding machine, the particle size of a coarse sanding belt of the sanding machine is 20#-60 #; (2), finishing sanding on the right side of the magnesium oxychloride cement board by the sanding machine, the particle size of a finishing sanding belt of the sanding machine is 80#-600#, the positive and negative deviation of the right side of the magnesium oxychloride cement board after the finishing sanding is 0.02mm-0.5mm; 3), coating adhesive on the right side, sticking on fabric on the right side, hot pressing by a hot press, and cold pressing by a cold press to prepare the building sheets of the invention. The invention also discloses a building sheet prepared by the production technology of building sheets. The invention also discloses five applications of the building sheets.

The invention relates to an on-line inspection method for an infrared temperature sensing device of unmanned aerial vehicle power equipment. An unmanned aerial vehicle is utilized to patrol and inspect power high-voltage equipment, when an infrared thermal imaging probe in a compound eye probe detects that the heating temperature of certain power high-pressure equipment reaches an overheating fault early warning value, the unmanned aerial vehicle gives an alarm to a remote control system and flies over a standard inspection temperature calibrator for temperature calibrating, if the calibratingerror is within an allowable negative deviation range, a control module gives an fault early warning of the overheated power high-pressure equipment, a thermal imaging image of the overheated fault equipment is displayed on a display screen, and a worker is reminded to take measures as soon as possible to eliminate faults. The on-line inspection method for the infrared temperature sensing deviceof the unmanned aerial vehicle power equipment has the advantages that temperature measurement detection can be automatically carried out on the power high-pressure equipment, and powerful guarantee is provided for the safe and economic operation of the power high-pressure equipment of transformer substations.

The invention relates the technical field of numerical control drilling precision analysis, and discloses a hole site precision analysis method for circuit board drilling. The method comprises the following steps that first, drill-down is carried out by a drilling tool at a certain feeding speed; second, when the drilling tool is drilled into the drill entering surface of a circuit board, an error angle exists between the vertical center line of a spindle and the horizontal center line of the circuit board; third, the dynamic offset of the spindle of the drilling tool enables the drilling tool to be subjected to a component force in the horizontal direction; fourth, the action of the error angle and the dynamic offset of the spindle enables the drill point of the drilling tool to slip instantaneously; fifth, the drill-down is carried out by the drilling tool in an included angle instantaneously formed by the drill entering surface of the circuit board and the vertical direction; sixth, the negative deviation of the drill exiting surface of the circuit board is larger than the positive deviation of the drill entering surface of the circuit board, and a hole site deviation is formed. The hole site precision analysis method for the circuit board drilling uses a final accurate calculating formula of the hole site deviation value, the hole site deviation of the circuit board can be predicted at the early stage, and then the project optimization and the production operation can be guided.

The invention discloses a tool center point calibration circuit of a welding robot. The tool center point calibration circuit includes a signal receiving circuit, a comparison switch circuit and a stable driving circuit. The signal receiving circuit transforms real-timely received 4-20 mA displacement signals into 0-10 V voltage signals, then the 0-10 V voltage signals enter a subtracter in the comparison switch circuit for subtracting, positive deviation signals or negative deviation signals are output, then the positive deviation signals or the negative deviation signals are compared and analyzed through a window comparison circuit composed of an operational amplifier AR3 and an operational amplifierAR4. When an allowable deviation range is exceeded by + / -3%, a high level is output, a relay K1 coil is energized, and the stable driving circuit receives the positive deviation signals or the negative deviation signals through a closed relay K1 normally open contact K1-1, and an operational amplifier AR5 is used for reversely amplifying the signals, the signals are subjected to feedback calibration through an audion Q2 and an audion Q3, and then the direction and magnitude of the current flowing through an electromagnet are controlled through a series resistor R16, so that the horizontal or vertical positive deviation signals or the horizontal or vertical negative deviation signals are adjusted; and the problems that due to small deviation, the welding robot moves frequently to find the center and the work is difficult are effectively solved.