Abstract: The present disclosure is related to systems and methods for indoor positioning. The method includes obtaining a first location of a subject at a first time point. The method also includes determining one or more motion parameters associated with the subject at least based on one or more sensors carried by the subject. The method further includes determining, based on the first location of the subject and the one or more motion parameters associated with the subject, a second location of the subject at a second time point after the first time point. The method still further includes adjusting, at least based on surroundings information associated with the subject at the second time point, the second location of the subject to determine a target location of the subject.

Abstract: The irregularly-shaped display panel comprises a plurality of pixel units arranged in an array and a shielding layer. some of the pixel units are shielded by the shielding layer to form irregularly-shaped pixel units, and each of the irregularly-shaped pixel unit at least comprises a first irregularly-shaped pixel unit; in the first irregularly-shaped pixel unit, the areas of opening regions of at least two sub-pixels shielded by the shielding layer are different, and the sub-pixel having a larger area of an opening region shielded by the shielding layer has a greater pixel pressure difference.

Abstract: A molecular marker for identifying DNA methylation and thereby detecting the benignity or malignancy of a lung nodule is disclosed. The molecular marker for identifying DNA methylation includes the sequence of, or the completely complementary sequence to, SEQ ID NO:6 or a continuous fragment of at least 55% of the full length of the sequence of, or the completely complementary sequence to, SEQ ID NO:6. Also disclosed are applications of the molecular marker for identifying DNA methylation, including a corresponding detection reagent kit and a corresponding detection method. The disclosed molecular marker combinations for identifying DNA methylation are highly correlated to lung cancer, are highly sensitive and specific when used to detect the benignity or malignancy of a lung nodule, and can increase the detection rate of malignant lung nodules while lowering the false positive rate.

Abstract: A well cementing method is described for improving cementing quality by controlling the hydration heat of cement slurry. By controlling the degree and/or rate of hydration heat release from cement slurry, the method improves the hydration heat release during formation of cement with curing of cement slurry, improves the binding quality between the cement and the interfaces, and in turn improves the cementing quality at the open hole section and/or the overlap section. The cementing method improves cementing quality of oil and gas wells and reduces the risk of annular pressure.

Abstract: The irregularly-shaped display panel comprises a plurality of pixel units arranged in an array and a shielding layer. some of the pixel units are shielded by the shielding layer to form irregularly-shaped pixel units, and each of the irregularly-shaped pixel unit at least comprises a first irregularly-shaped pixel unit; in the first irregularly-shaped pixel unit, the areas of opening regions of at least two sub-pixels shielded by the shielding layer are different, and the sub-pixel having a larger area of an opening region shielded by the shielding layer has a greater pixel pressure difference.

Abstract: The present disclosure relates to a radar ranging system based on a true random generator and a ranging method thereof The present disclosure adopts the following technical scheme: the system comprises a radar signal modulation and transmission unit and a radar signal receiving and processing unit, wherein the radar signal modulation and transmission unit inputs and stores a true random binary sequence generated by the true random generator in a memory, and cyclically outputs the true random binary sequence to a BPSK modulator for phase modulation. The receiving and amplifying unit receives the reflected radar signal. The down-sampling unit down samples the intermediate frequency signal generated by the mixers. The data processing unit converts the sampled analog signal into a digital signal and cross-correlates the signal with the true random binary sequence in the memory, so as to obtain the distance to the object side to be measured.

Abstract: A driving circuit and a driving method are provided. The driving circuit includes a power stage circuit and a full-bridge circuit. The power stage circuit is configured to receive an input voltage, and generate an output voltage at an output port of the power stage circuit. The full-bridge circuit is coupled to the output port of the power stage circuit and is configured to perform charging and discharging on a piezoelectric load. An operating mode of the full-bridge circuit is controlled, so that a supply voltage signal for driving the piezoelectric load during a first operating interval of an operating cycle corresponds to a reference voltage in a first interval, and the supply voltage signal during a second operating interval of the operating cycle corresponds to the reference voltage in a second interval. The driving circuit has a small volume, which is conducive to circuit integration.

Abstract: The embodiment of the present disclosure provides a deep neural network (DNN)-based multi-target constant false alarm rate (CFAR) detection method. The method includes: obtaining target values to be measured based on radar IF (IF) signals to be detected, the target values to be measured including a measured frequency value and a measured intensity value of the radar IF signals; obtaining peak sequences based on the target values to be measured; generating a target detection result by processing the peak sequences based on a DNN detector, the DNN detector being a machine learning model; generating approximated maximum likelihood estimation (AMLE) of a scale parameter based on an approximated maximum likelihood estimator; generating a false alarm adjustment threshold based on a preset false alarm rate and the AMLE; and generating a constant false alarm detection result by processing the target detection result based on the false alarm adjustment threshold.

Abstract: The present disclosure provides a voltage controlled oscillator for flipped and complementary low noise. The voltage controlled oscillator includes a first resonant cavity, a second resonant cavity, and an associated circuit. The associated circuit is configured to connect the first resonant cavity and the second resonant cavity in series and couple the first resonant cavity and the second resonant cavity. A resonant frequency of the first resonant cavity and a resonant frequency of the second resonant cavity satisfy a first preset condition.

Abstract: A method of driving a switching element in a switching circuit, where the switching element comprises a plurality of power transistors coupled in parallel, can include: determining a state of a load in the switching circuit; decreasing a driving voltage of at least one power transistor in order to reduce driving loss of the switching element when a load is in a first load state; and maintaining driving voltages of the plurality of power transistors at a first threshold when the load is in a second load state.

Abstract: The present disclosure discloses an adaptive satellite-aiming method for a low-orbit mobile satellite communication network. The method first receives signals through an array antenna, estimates an offset angle between an array antenna and a satellite beam using a MUSIC-based angle estimation method; then, based on the estimated offset angle, tracks a satellite direction using the adaptive coupling model and achieves tracking and alignment of an antenna direction based on feature parameters extracted during a tracking process; finally, based on the obtained feature parameters, adjusts parameters in the MUSIC-based angle estimation method, and repeats the above steps, to achieve real-time estimation of the offset angle and real-time tracking and alignment of the antenna direction.

Abstract: A dark-field optical system may include a rotational objective lens assembly with a dark-field objective lens to collect light from a sample within a collection numerical aperture, where the dark-field objective lens includes an entrance aperture and an exit aperture at symmetrically-opposed azimuth angles with respect to an optical axis, a rotational bearing to allow rotation of at least a part of the dark-field objective lens including the entrance aperture and the exit aperture around the optical axis, and a rotational driver to control a rotational angle of the entrance aperture. The system may also include a multi-angle illumination sub-system to illuminate the sample with an illumination beam through the entrance aperture at two or more illumination azimuth angles, where an azimuth angle of the illumination beam on the sample is selectable by rotating the objective lens to any of the two or more illumination azimuth angles.

Abstract: Methods and systems for detecting and classifying defects based on the phase of dark field scattering from a sample are described herein. In some embodiments, throughput is increased by detecting and classifying defects with the same optical system. In one aspect, a defect is classified based on the measured relative phase of scattered light collected from at least two spatially distinct locations in the collection pupil. The phase difference, if any, between the light transmitted through any two spatially distinct locations at the pupil plane is determined from the positions of the interference fringes in the imaging plane. The measured phase difference is indicative of the material composition of the measured sample. In another aspect, an inspection system includes a programmable pupil aperture device configured to sample the pupil at different, programmable locations in the collection pupil.

Abstract: The present disclosure discloses an on-chip synchronous self-repairing system based on a low-frequency reference signal. The system adopts a dual-input PLL stellate coupled structure or a dual-input PLL butterfly-shaped coupled structure, and delay of the whole loop is made to be an integral multiple of the reference signal by synchronizing the transmitted reference signal with the received reference signal, so as to ensure synchronization of local oscillation signal of each IC chip. The transmission wire based on an adjustable left-handed material is used as a delay wire to connect the dual-input PLL, thereby achieving low loss and reducing the physical distance of the delay wire. The system has the advantages of small area, low loss, strong adaptability and strict synchronization in various environments.

Abstract: The present disclosure provides a method for generate array element excitation of a conformal array based on an iterative algorithm, the method comprises obtaining a first index of a pattern of an array antenna by a processor; obtaining multiple optimization objectives according to design indexes of the array antenna by the processor; based on the first index, iteratively determining, by the processor, a first array element excitation satisfying a dynamic range ratio (DRR) of an array element excitation amplitude under the first index through a preset conversion relationship and a preset approach; based on the first array element excitation, obtaining, by the processor, a second array element excitation satisfying the multiple optimization objectives under a constraint of the DRR of the array element excitation amplitude through a solution algorithm; based on the second array element excitation, the design indexes, and basic parameters, generating, by the processor, the array antenna, the basic parameters inc

Abstract: A method of inductor current reconstruction for a power converter can include: acquiring at least one of a current that represents a current flowing through a main power transistor, and a current that represents a current flowing through a rectifier transistor, in order to generate a switching current sampling signal in the power converter; and generating an inductor current reconstruction signal representing an inductor current in one complete switching cycle according to the switching current sampling signal and an inductor voltage signal representing a voltage across an inductor in the power converter.

Abstract: A driving circuit for driving a piezoelectric load, can include: a rechargeable power supply; a power stage circuit coupled between the rechargeable power supply and the piezoelectric load; where during a first operation interval of an operation period, the rechargeable power supply charges the piezoelectric load through the power stage circuit, such that a power supply voltage signal provided to the piezoelectric load in the first operation interval corresponds to a reference voltage in a first interval; and where during a second operation interval of the operation period, the piezoelectric load charges the rechargeable power supply through the power stage circuit, such that the power supply voltage signal in the second operation interval corresponds to the reference voltage in a second interval.

Abstract: The present disclosure discloses an adaptive satellite-aiming method for a low-orbit mobile satellite communication network. The method first receives signals through an array antenna, estimates an offset angle between an array antenna and a satellite beam using a MUSIC-based angle estimation method; then, based on the estimated offset angle, tracks a satellite direction using the adaptive coupling model and achieves tracking and alignment of an antenna direction based on feature parameters extracted during a tracking process; finally, based on the obtained feature parameters, adjusts parameters in the MUSIC-based angle estimation method, and repeats the above steps, to achieve real-time estimation of the offset angle and real-time tracking and alignment of the antenna direction.

Abstract: Disclosed is a space partitioning method for a database table, including: determining a first data amount within a first time period and a second data amount within a second time period of the database table; calling a target network model, inputting the first data amount and the second data amount into the target network model, and outputting a third data amount within the target time period, wherein the target network model is configured to predict a data amount of a next time period based on data amounts of a previous time period and a current time period; and determining a number of target regions based on the third data amount within the target time period, and partitioning, based on the number of target regions, a space in the database table configured to store the data to be stored.