Abstract: A method for tracking a user during a videotelephony session initiated by a videotelephony application program; it includes generating an image stream with a camera external from the smartphone or tablet; at least periodically performing image object analysis from the image stream generated by the external camera to track a position of the user within an image of the image stream; and generating a pan command and/or a tilt command to cause a pan and tilt in order to center the user in the field of view of the external camera.

Abstract: A system for three dimensional (3D) model texturing. The system includes a computing device configured to: instruct a camera to capture images of an object; construct a 3D model of the object based on the images; texture the 3D model using keyframes of the images to obtain a textured 3D model; generate guidance images by projecting the textured 3D model to camera poses of the keyframes; for each guidance image and keyframe pair: modify the guidance image and the keyframe based on their correspondence to obtain enhanced guidance image and warped image, combine the enhanced guidance image and the warped image to obtain harmonized image, and project color from the harmonized images to the 3D model to obtain textured 3D model.

Abstract: A method for operating a solid state circuit breaker includes obtaining information about a maximum breaking current value, obtaining a present current value detected within a present sampling time period and a previous current value detected within a previous sampling time period, the previous sampling period being before the present sampling time period, determining a predicted current value within a next sampling time period based on the present current value, the previous current value, and duration of the sampling time period, the next sampling period being after the present sampling time period, determining whether the predicted current value is greater than the maximum breaking current value of the solid state circuit breaker, and controlling the solid state circuit breaker to disconnect a circuit in which the solid state circuit breaker resides upon the predicted current value being greater than the maximum breaking current value.

Abstract: A hybrid circuit breaker includes a semiconductor circuit breaker, connected between a first output end of a converter of a power supply or a source branch and a first end of a damping module; a first mechanical circuit breaker, connected in parallel to the semiconductor circuit breaker, an energy absorber, connected in parallel to the semiconductor circuit breaker, and a controller coupled to the semiconductor circuit breaker and the first mechanical circuit breaker, and when a current flowing through the converter is greater than a safe current, the controller is configured to control the first mechanical circuit breaker to be disconnected, and control the semiconductor circuit breaker to be closed.

Abstract: An electric grid includes feed-ins, loads, and a distribution grid, which is arranged therebetween. The distribution grid comprises at least one busbar and at least one device for opening or closing a DC circuit. The at least one device includes an electric switch for opening or closing the DC circuit, a fault current detector, a trigger unit, a precharging device, and a control unit for automatically closing the electric switch after the precharging process. The electric switch opens the DC circuit via the trigger unit if a fault current is detected by the fault current detector, and the precharging device restores the voltage on the busbar prior to closing the electric switch.

Abstract: A method for controlling a solid state circuit breaker includes detecting a direction of a current flowing through the solid state circuit breaker, obtaining a breaking current value of the solid state circuit breaker according to the detected direction of the current, obtaining a value of a maximum threshold current to flow through the solid state circuit breaker, obtaining a predicted current value within a next sampling period of a present sampling period of the solid state circuit breaker, comparing the predicted current value with the breaking current value, and upon the predicted current value being greater than the breaking current value, delaying the solid state circuit breaker, and upon the predicted current value being greater than the maximum threshold current value, controlling the solid state circuit breaker to disconnect a circuit in which the solid state circuit breaker resides.

Abstract: A method for tracking a user during a videotelephony session initiated by a videotelephony application program; it includes generating an image stream with a camera external from the smartphone or tablet; at least periodically performing image object analysis from the image stream generated by the external camera to track a position of the user within an image of the image stream; and generating a pan command and/or a tilt command to cause a pan and tilt in order to center the user in the field of view of the external camera.

Abstract: Provided is a nano grid protection device for a nano grid including a distributed power supply, a large power grid including the nano grid protection device, and a method for controlling the nano grid protection device. In an embodiment, the nano grid is connected with a bus through the nano grid protection device and a main grid is connected with the bus through a main grid protection device. In an embodiment, the nano grid protection device includes: a signal unit, configured to detect and send current information passing through the nano grid protection device, the current information including the magnitude and direction of the current; a controller, configured to determine, based upon the received current information, whether to send a trip signal or not; and an execution mechanism, configured to execute a trip operation of the nano grid protection device upon receiving the trip signal.

Abstract: A solid-state circuit breaker and breaking method are disclosed. In an embodiment, the solid-state circuit breaker includes a semiconductor switch; a controller, connected to the semiconductor switch; and an energy absorber, connected in parallel with the semiconductor switch. The controller is configured to obtain an equivalent inductance of a circuit of the solid-state circuit breaker upon a fault occurring in a line. Further, upon the equivalent inductance being greater than an inductance estimated value, the controller is configured to set a second current fault threshold. Finally, upon a fault current of the line reaching the second current fault threshold, the semiconductor switch is controlled to execute a closing operation.

Abstract: A digital signature method, a device, and a system of the present invention can generate a partial signature private key T corresponding to a user by a key generation center using a digital signature algorithm based on the EC-Schnorr, and sign a message M by using a standard digital signature algorithm such as the ECDSA. In the calculation of generating the second part w of the partial signature private key T, a signature assignment R is used, and the signature assignment R is a hash digest of a message including at least a pre-signature ? and an ID of a signature side. When signing the message M and verifying the signature of the message M, the operation requiring M as input uses a concatenation of R and M as input. The present invention uses a mechanism to connect two signature algorithms to ensure that the constructed complete algorithm can effectively resist known attacks.

Abstract: A solid-state circuit breaker and breaking method are disclosed. In an embodiment, the solid-state circuit breaker includes a semiconductor switch; a controller, connected to the semiconductor switch; and an energy absorber, connected in parallel with the semiconductor switch. The controller is configured to obtain an equivalent inductance of a circuit of the solid-state circuit breaker upon a fault occurring in a line. Further, upon the equivalent inductance being greater than an inductance estimated value, the controller is configured to set a second current fault threshold. Finally, upon a fault current of the line reaching the second current fault threshold, the semiconductor switch is controlled to execute a closing operation.

Abstract: An audio amplifier includes: a buck controller configured to control an output voltage at a first supply terminal, the output voltage selected from a set including a plurality of output voltages, where the output voltage takes a settling time to settle; a first audio bridge including: a class-AB driver stage coupled to the first supply terminal, and a delay insertion circuit configured to receive a processed digital stream and provide the processed digital stream to the class-AB driver stage a delay time after receiving the processed digital stream, where the delay time is based on the settling time; and an audio amplitude detector configured to detect a first peak amplitude in the first digital audio stream, where the buck controller is configured to select a lowest output voltage from the set that is higher than the first peak amplitude plus a headroom voltage.

Abstract: In an embodiment, a class-D amplifier includes an input terminal configured to receive an input signal; a comparator having an input coupled to the input terminal; a deglitching circuit having an input coupled to an output of the comparator; and a driving circuit having an input coupled to an output of the deglitching circuit. The deglitching circuit includes a logic circuit coupled between the input of the deglitching circuit and the output of the deglitching circuit. The logic circuit is configured to receive a clock signal having the same frequency as the switching frequency of the class-D amplifier.

Abstract: Provided are a grid fault detection method and a device. The grid includes at least one AC power source provided by a public grid. The AC power source is coupled to a plurality of parallel circuits, each including a plurality of parallel branches. The parallel branches are each connected with a load and/or a DC power source. The grid fault detection method having the distributed energy resource includes: selecting a first collection point between the AC power source and the plurality of parallel circuits, and collecting a current value and a current direction of the first collection point; comparing an output current and an input current of the first collection point, and upon the input current being greater than the output current, it is determined that the plurality of parallel circuits are faulty. Accordingly, the plurality of collection points check the fault, so as to trigger a protection device.

Abstract: An audio amplifier includes: a buck controller configured to control an output voltage at a first supply terminal, the output voltage selected from a set including a plurality of output voltages, where the output voltage takes a settling time to settle; a first audio bridge including: a class-AB driver stage coupled to the first supply terminal, and a delay insertion circuit configured to receive a processed digital stream and provide the processed digital stream to the class-AB driver stage a delay time after receiving the processed digital stream, where the delay time is based on the settling time; and an audio amplitude detector configured to detect a first peak amplitude in the first digital audio stream, where the buck controller is configured to select a lowest output voltage from the set that is higher than the first peak amplitude plus a headroom voltage.

Abstract: A digital signature method, a device, and a system of the present invention can generate a partial signature private key T corresponding to a user by a key generation center using a digital signature algorithm based on the EC-Schnorr, and sign a message M by using a standard digital signature algorithm such as the ECDSA. In the calculation of generating the second part w of the partial signature private key T, a signature assignment R is used, and the signature assignment R is a hash digest of a message including at least a pre-signature ? and an ID of a signature side. When signing the message M and verifying the signature of the message M, the operation requiring M as input uses a concatenation of R and M as input. The present invention uses a mechanism to connect two signature algorithms to ensure that the constructed complete algorithm can effectively resist known attacks.

Abstract: A method for preparing field muskmelon oil includes the following steps: S1, removing foreign matter, including: removing the foreign matter in field muskmelon seeds; S2, low-temperature pressing, including: performing the low-temperature pressing on the field muskmelon seeds after removing the foreign matter in step S1 to obtain an oil residue mixture; S3, filtering and removing impurities: filtering the oil residue mixture obtained by the low-temperature pressing in step S2 to remove the impurities to obtain a primary oil; and S4, centrifugal separation, including: centrifugally separating the primary oil obtained by filtering and removing impurities in step S3 to obtain the field muskmelon oil. The new method avoids using high-temperatures resulting in optimal yield of nutritional content and no harmful byproducts.

Abstract: In an embodiment, a class-D amplifier includes an input terminal configured to receive an input signal; a comparator having an input coupled to the input terminal; a deglitching circuit having an input coupled to an output of the comparator; and a driving circuit having an input coupled to an output of the deglitching circuit. The deglitching circuit includes a logic circuit coupled between the input of the deglitching circuit and the output of the deglitching circuit. The logic circuit is configured to receive a clock signal having the same frequency as the switching frequency of the class-D amplifier.

Abstract: In an embodiment, a class-AB amplifier includes: an output stage that includes a pair of half-bridges configured to be coupled to a load; and a current sensing circuit coupled to a first half-bridge of the pair of half-bridges. The current sensing circuit includes a resistive element and is configured to sense a load current flowing through the load by: mirroring a current flowing through a first transistor of the first half-bridge to generate a mirrored current, flowing the mirrored current through the resistive element, and sensing the load current based on a voltage of the resistive element.

Abstract: Provided is a nano grid protection device for a nano grid including a distributed power supply, a large power grid including the nano grid protection device, and a method for controlling the nano grid protection device. In an embodiment, the nano grid is connected with a bus through the nano grid protection device and a main grid is connected with the bus through a main grid protection device. In an embodiment, the nano grid protection device includes: a signal unit, configured to detect and send current information passing through the nano grid protection device, the current information including the magnitude and direction of the current; a controller, configured to determine, based upon the received current information, whether to send a trip signal or not; and an execution mechanism, configured to execute a trip operation of the nano grid protection device upon receiving the trip signal.