598 results about "Forward backward" patented technology

A high dimensional touchpad (HDTP) controls a variety of computer windows systems and applications by detecting a user's finger movement in the left-right, forward-backward, roll, pitch, yaw, and downward pressure directions. Measurements obtained from the touchpad of at least two attributes of finger movement at two different time intervals are used to provide a first and a second finger position attribute used to control an application on an electronic device. The finger roll angle is determined by detecting the edge and the peak region of a finger contact area. Also, a visual color displayed in an application operating on an electronic device is controlled by a measured-angle value of a finger in contact with a touchpad.

An apparatus and method is disclosed for efficiently sensing and tracking objects in an indoor environment by simultaneously measuring the object movement with an inertial navigation system and a reference location positioning system. By combining the measurements obtained with accelerometers, gyroscopes, angle estimators and the reference system using an extended Kalman filter based approach, a position estimate is obtained with high reliability and precision accuracy. Improvement in performance is obtained by the incorporation of dynamic mode switching and forward-backward smoothing in the location position estimator.

The phosphate rock floating process is one phosphate rock grading forward-backward floating process, in which the raw ore pulp is first separated into two parts of different fineness and then forward-backward floated in two separated branches. The coarse ore pulp is made to separated in high concentration so as to save floating chemical; while the fine ore pulp is floated through adding dispersant to raise the floating efficiency. The grading floating process can avoid the mutual interference between coarse and fine grains, and thus has raised separating efficiency, raised floated concentrate quality, lowered floating chemical consumption and raised technological and economic indexes.

The invention discloses an electric vehicle orderly charging control method, which mainly comprises the following steps: firstly obtaining the probability distribution of the electric vehicle daily traveling mileage, the last trip end time and the charging time length according to the use situation of the electric vehicle; simulating the distribution of electric vehicle charging load in differentperiods of 24 hours a day through the Monte Carlo method; accessing the load of the electric vehicle into the IEEE 33-bus distribution system randomly, and calculating the voltage amplitude and network loss of each node of the distribution system through the forward-backward substitution power flow calculation method; constructing an electric vehicle orderly charging optimal dispatching model based on an electricity price guidance scheme according to the 24-hour charging power demand model of the electric vehicle and the negative influence of disordered charging on the distribution network. The optimal dispatching model optimizes the dispatching of the electricity price and grid peak-valley difference to reduce daily load peak-valley difference and electric vehicle user charging cost, andalleviates the influence of electric vehicle access on the grid.

The invention provides a method for selecting initial values of three-phase Newton-Raphson method power flow calculation of a power distribution network. The method comprises the following steps: S1, establishing a power distribution network three-phase system model; S2, establishing a power distribution network three-phase simplification system, and numbering nodes and branches of the power distribution network three-phase simplification system; S3, storing a three-phase load parameter of each node according to the serial number sequence of the nodes, and storing a three-phase impedance parameter of each branch according to the serial number sequence of the branches; S4, performing per-unit on the three-phase load parameter of each node and the three-phase impedance parameter of each branch; S5, establishing a power distribution network single-phase simplification system; S6, selecting convergence precision, performing power flow calculation on the power distribution network single-phase simplification system by a forward-backward sweep method to obtain the voltage amplitude and the phase angle of each node of the power distribution network single-phase simplification system; S7, selecting the initial value of the three-phase Newton-Raphson method power flow calculation of a power distribution network three-phase system. The method can select the initial value of the three-phase Newton-Raphson method power flow calculation by the forward-backward sweep method with high calculation speed and good convergence.

The present invention relates to a display device of a focal angle and distance in an iris recognition system, in which the device includes: a distance measurer for measuring a distance between a user and an iris recognition camera, and an indicator for quantitatively indicating a forward-backward distance and a right and left or up and down direction the user should move, in accordance with the distance measured by the distance measurer.

SAR images are improved by a method for acquiring a synthetic aperture image from a sequence of periodic pulse returns where the sequence of periodic pulse returns is interspersed with interrupts, i.e. missing pulses. The interrupts mark the start and end of one or more segments, where the segments contain the periodic pulse returns form the SAR image. The method comprises the steps of:

• • converting said pulse returns into a digital stream;
  • performing an azimuth deskew on said digital stream to obtain a deskewed digital stream;
  • forming a forward-backward data matrix from the deskewed digital stream for one or more segments;
  • forming an average segment covariance from the forward-backward data matrix;
  • computing a model order for the average segment covariance;
  • computing one or more linear prediction coefficients using data contained in the forward backward data matrix, and model order;
  • using the linear prediction coefficients to compute missing pulse returns belonging within the interrupts.

The computation for extrapolating the missing pulse returns is introduced after the Stolt interpolator in RMA processing. In computing the model order, eigenvalues are found and compared to a threshold. Roots of a linear prediction polynomial are computed, then stabilized to obtain stabilized roots. Linear prediction coefficients are reconstituted using the stabilized roots. Sub-bands are used to decrease computing time for the missing pulse returns.

The invention provides a low-voltage platform region intelligent management method based on a forward-backward substitution algorithm. The low-voltage platform region intelligent management method comprises the following steps: 1, determining a platform region with a low-voltage phenomenon; 2, collecting original data; 3, drawing a picture and setting electric element parameters; 4, carrying out load flow calculation; 5, analyzing low-voltage factors; and 6, carrying out low-voltage management and economic evaluation. According to the low-voltage platform region intelligent management method, a position with the low-voltage phenomenon in the platform region is found by algorithm calculation according to front end voltage and tail end voltage of the platform region; one set of intelligent management measures with best economical efficiency can be generated by combining an actual low-voltage phenomenon solving measure; and effective helps for platform region analysis and project approval are provided for field personnel.

A pedal motion path adjustable elliptical trainer includes a base frame , a support mechanism including a rail holder pivoted to the base frame, a support member and two sliding rails, a rotating mechanism set mounted at the left and right sides of the base frame and movable along a respective closed-loop motion path with a respective support link thereof respectively slidably coupled to one respective sliding rail, a linkage mechanism set mounted at the left and right sides of the base frame, and a sliding mechanism mounted at the rail holder and including a transmission member, two follower members respectively mounted on two opposite ends of the transmission member and movable relative to each other. Thus, the elliptical trainer allows the user to change forward-backward pedal motion paths or left-right pedal motion paths, achieving training of different groups of the muscles of the legs.

The invention discloses a systematic solution for voltage quality evaluation and optimization of low-voltage transformer area distribution networks. The systematic solution comprises the following steps: collecting topological structures, circuit parameters, phase sequence of tail end users, and load curve characters of the distribution networks in all low-voltage transformer areas to establish a low-voltage transformer area mathematical model; calculating average power or instantaneous power of users according to user consumption data in a marketing system of a power supply enterprise, and computing an active power, a line loss rate and each node voltage value of each section of a line through a forward-backward sweep distribution system power flow calculation method; performing optimal design and simulation analysis on the low-voltage transformer areas through modes of transferring load, newly increasing lines, changing lines and adjusting phase sequence to realize the optimal line loss rate and investment costs comprehensively. According to the solution, with a developed software platform, workload of line patrol and modeling in the low-voltage transformer areas can be greatly reduced, real-time data updating of the low-voltage transformer areas can be realized by basic-level power supply stations (offices) through combining with corresponding management measures, and the operation and maintenance level of the low voltage distribution networks can be improved.

A moving radar (405) generates a synthetic aperture image from an incomplete sequence of periodic pulse returns. The incomplete sequence of periodic pulse returns has one or more missing pulses. The radar converts the incomplete sequence of pulse returns into a digital stream. A computer (403) processes the digital stream by computing an along track Fourier transform (402), a range compression (408), an azimuth deskew (410) and an image restoration and auto focus (412). The image restoration and autofocus (412) utilizes a low order autofocus (501), a gap interpolation using a Burg algorithm (503), and a high order autofocus (505) for generating an interpolated sequence. The interpolated sequence contains a complete sequence of periodic pulse returns with uniform spacing for generating the synthetic aperture image. The image restoration and autofocus (412) computes a linear prediction coefficients estimate using the Burg Algorithm (606). The linear prediction coefficients estimate (606) is used to compute a weighted forward-backward interpolation to generate the complete sequence of periodic pulse returns (608).

A massage machine that can stably rock a chair main body in a forward-backward direction and that has minimal overall height comprising a chair main body, a base which supports the chair main body, massage portions provided in the chair main body, and a rocking mechanism portion which rocks the chair main body in the forward-backward direction with respect to the base. The rocking mechanism portion includes link members, each of which has a lower portion pivotally supported by the base and an upper portion pivotally supporting the chair main body. The chair main body is rocked in the forward-backward direction by rocking the upper portions of the link members in the forward-backward direction.

The present invention discloses a front water diversion propulsion ship and aims at providing a regular water diversion type ship which can eliminate wave making completely or reduce the wave making and eliminate wave making resistance and can also reduce the friction resistance and motivate the hydrodynamic propulsion to improve the comprehensive performance of the ship such as speed, stability and efficiency. The front water diversion propulsion ship is realized by a technical proposal as follows: a forward water inlet is arranged under the water line at the front part of the ship; and a backward water outlet or a thruster inlet are arranged and matched at the forward water inlet with a flow passage which runs through the forward water inlet and a stern or arranged at two lateral parts. Or a forward-backward thruster is arranged under the water line, or a watercourse is matched and arranged in the front of the water line, two lateral water outlets which are propelled by two sides of the front of the ship or propelled by a stern impeller are arranged, or the back ship body of the thruster is arranged as a streamline after run to motivate the hydrodynamic propulsion. The technology of the front water diversion propulsion ship can fit for designing and manufacturing a powered regular drainage ship and improving the existing ship and is especially fit for designing, manufacturing and improving the economical, large and jumbo ships.

The present invention discloses a mutual coupling condition-oriented bistatic MIMO (multiple-input multiple-output) radar angle estimation method. According to the method, radar data which have been subjected to matched filtering are expressed as a third-order tensor model by means of the multi-dimensional structure of array signals; since a uniform linear array mutual coupling matrix has a strip-shaped Toeplitz feature, the common scale conversion feature of a part of an array element directional matrix is utilized to eliminate the influence of mutual coupling; on the basis of a forward-backward smoothing technique and a unitary transformation technique, the augmented output trilinear model of decoupling-post data is constructed; and joint DOD (direction-of-departure) and DOA (direction-of-arrival) estimation is related with the trilinear model; and a target DOD and DOA are estimated through the least squares method. Compared with a traditional algorithm, the bistatic MIMO (multiple-input multiple-output) radar angle estimation method under the mutual coupling condition can effectively deal with situations where mutual coupling exists between a transmitting array and a receiving array, can automatically match the estimated DOD and DOA, and can reduce computational complexity by using a feature that trilinear decomposition only involves real number operation.

The invention discloses a power distribution network planning method based on an improved genetic algorithm and a PRIM algorithm. The method comprises: establishing a power distribution network planning model; secondly, using an improved genetic algorithm to solve the optimal station address and number of the medium-voltage power distribution station and the capacity of the selected transformer, and enhancing the genetic algorithm by improving chromosome coding, a fitness function and a genetic operator; thirdly, using an improved PRIM algorithm to solve feeder line optimal paths between the high-voltage transformer substation and the medium-voltage transformer substation, between the medium-voltage transformer substation and the load center and between the medium-voltage transformer substation and the load center; fourthly, executing a power distribution network planning method based on an improved genetic algorithm and a PRIM algorithm on the test network to obtain an optimal arrangement planning scheme of the transformer substation and the medium-voltage feeder line, and determining an optimal power distribution network planning scheme by calculating economic and reliability indexes; and fifthly, performing load flow calculation by adopting a forward-backward sweep method to verify the practicability of the planning scheme. The method has the advantages of being high in searching speed and suitable for solving the planning problem of the large-planning power distribution network.

The invention provides a self-adaptive device and a method for analyzing global power flow of generation, transmission and distribution, which belongs to the technical field of power transmission and distribution of power systems. The device comprises an upper computer and a lower computer, wherein the lower computer comprises a power-flow feedback module; a global power system is divided into a master system and a slave system; according to the characteristics of each part of the power system, the master system adopts a Newton-Raphson power-flow analysis method, while the slave system adopts a forward-backward substitution power-flow analysis method; and the master system and the slave system are organically linked together through master-slave-system association nodes in the middle. The invention has the advantages that the device adopts the power-flow feedback module, uses slave-system node-voltage signals obtained from last power-flow calculation of the slave system for next power-flow calculation of the slave system, and realizes the optimization of the prior forward-backward substitution algorithms, and as the method adopts the forward-backward substitution method which reduces iterations compared with the prior forward-backward substitution method, the device for analyzing global power flow not only guarantees accurate power-flow analysis, but also raises convergence rate and saves storage space.