Patents Assigned to Nanjing University
  • Publication number: 20230154207
    Abstract: A driver fatigue detection method based on combining a pseudo-three-dimensional (P3D) convolutional neural network (CNN) and an attention mechanism includes: 1) extracting a frame sequence from a video of a driver and processing the frame sequence; 2) performing spatiotemporal feature learning through a P3D convolution module; 3) constructing a P3D-Attention module, and applying attention on channels and a feature map through the attention mechanism; and 4) replacing a 3D global average pooling layer with a 2D global average pooling layer to obtain more expressive features, and performing a classification through a Softmax classification layer. By analyzing the yawning behavior, blinking and head characteristic movements, the yawning behavior is well distinguished from the talking behavior, and it is possible to effectively distinguish between the three states of alert state, low vigilant state and drowsy state, thus improving the predictive performance of fatigue driving behaviors.
    Type: Application
    Filed: August 18, 2020
    Publication date: May 18, 2023
    Applicant: Nanjing University of Science and Technology
    Inventors: Yong QI, Yuan ZHUANG
  • Patent number: 11644382
    Abstract: A high-temperature biaxial strength tester for a CMC turbine vane includes a test stand, a thermal insulation box, a vane fixture, a biaxial loading device, thermocouples, a multi-channel thermometer, quartz lamps, a digital image correlation (DIC) system, and a cooling circulation system. The biaxial loading device includes two loading mechanisms arranged at 90° to each other. Each of the two loading mechanisms includes an electric cylinder and a ceramic push rod. One end of the ceramic push rod is connected to the electric cylinder, and the other end of the ceramic push rod extends into the thermal insulation box to contact an outer platform of the CMC turbine vane. The electric cylinder is provided with a load-displacement sensor. The thermocouples are arranged on the thermal insulation box. The quartz lamps are arranged inside the thermal insulation box. The multi-channel thermometer is connected to the thermocouples.
    Type: Grant
    Filed: July 28, 2022
    Date of Patent: May 9, 2023
    Assignee: Nanjing University of Aeronautics and Astronautics
    Inventors: Xiguang Gao, Guoqiang Yu, Yingdong Song, Fangxiao Song, Chuyang Xie, Yunfa Jia, Jinkang Du
  • Publication number: 20230133628
    Abstract: A brain-inspired cognitive learning method can obtain good learning results in various environments and tasks by selecting the most suitable algorithm models and parameters based on the environments and tasks, and can correct wrong behavior. The framework includes four main modules: a cognitive feature extraction module, a cognitive control module, a learning network module, and a memory module. The memory module includes a data base, a cognitive case base, and an algorithm and hyper-parameter base, which store data of dynamic environments and tasks, cognitive cases, and concrete algorithms and hyper-parameter values, respectively. For dynamic environments and tasks, the most suitable algorithm model and hyper-parameter combination can be flexibly selected. In addition, with “good money drives out bad”, mislabeled data is corrected using correctly labeled data, to achieve robustness of training data.
    Type: Application
    Filed: November 8, 2021
    Publication date: May 4, 2023
    Applicant: Nanjing University of Aeronautics and Astronautics
    Inventors: Qihui WU, Tianchen RUAN, Shijin ZHAO, Fuhui ZHOU, Yang HUANG
  • Publication number: 20230122985
    Abstract: The invention discloses a single-frame fringe pattern analysis method based on multi-scale generative adversarial network. A multi-scale generative adversarial neural network model is constructed and a comprehensive loss function is applied. Next, training data are collected to train the multi-scale generative adversarial network. During the prediction, a fringe pattern is fed into the trained multi-scale network where the generator outputs the sine term, cosine term, and the modulation image of the input pattern. Finally, the arctangent function is applied to compute the phase. When the network is trained, the parameters of the network do not need to manually tune during the calculation. Since the input of the neural network is only a single fringe pattern, the invention provides an efficient and high-precision phase calculation method for moving objects.
    Type: Application
    Filed: August 27, 2020
    Publication date: April 20, 2023
    Applicant: Nanjing University of Science and Technology
    Inventors: Shijie FENG, Qian CHEN, Chao ZUO, Yuzhen ZHANG, Jiasong SUN, Yan HU, Wei YIN, Jiaming QIAN
  • Patent number: 11624848
    Abstract: The underwater acoustic test system comprises an underwater acoustic transmitting unit, an underwater acoustic parabolic reflector, an underwater acoustic receiving unit, an orientation control system, and a computer measurement and control system. The underwater acoustic transmitting unit comprises an underwater acoustic signal generator and a transmitting transducer. The underwater acoustic parabolic reflector comprises a central main reflecting area and an edge diffraction processing area, wherein the central main reflecting area is configured for reflecting acoustic wave signals, and the edge diffraction processing area is configured for reducing the influence of the underwater acoustic parabolic reflector on a test area. The underwater acoustic receiving unit comprises a receiving transducer and an underwater acoustic signal receiver. The orientation control system comprises a traveling crane and a test turntable.
    Type: Grant
    Filed: December 15, 2020
    Date of Patent: April 11, 2023
    Assignee: Nanjing University of Information Science & Technology
    Inventors: Junxiang Ge, Jie Wang, Hai Lin
  • Patent number: 11614562
    Abstract: The present application provides a method and system for identifying extreme climate events. The method acquires climate index (CI) grid data of a to-be-identified region within an extreme climate time period, and gradually expands each of event centers in the to-be-identified region, until CI values of all grids adjacent to the event center are not greater than a CI threshold. The method can obtain extreme climate impacted areas of extreme climate events in the to-be-identified region, and can further obtain CI intensities of the extreme climate events by average calculation. The method can obtain three pieces of dimension information on each of the extreme climate events in the to-be-identified region, including an extreme climate impacted area, a CI intensity and a duration. Therefore, the method can identify the extreme climate events more comprehensively.
    Type: Grant
    Filed: July 13, 2022
    Date of Patent: March 28, 2023
    Assignees: Nanjing University of Information Science & Technology, National Climate Center
    Inventors: Guojie Wang, Buda Su, Jinlong Huang, Yanjun Wang, Jianqing Zhai, Tong Jiang
  • Patent number: 11609323
    Abstract: An ultra-wideband ground penetrating radar control system, comprising a synchronous clock generating circuit, a GPS positioning module, a measuring wheel encoder module, a digitally controlled delay circuit for equivalent sampling, an analog-to-digital conversion (ADC) circuit, and a main controller. The synchronous clock generating circuit, the GPS positioning module, the measuring wheel encoder module, the digitally controlled delay circuit and the ADC circuit are all connected to the main controller. The synchronous clock generating circuit is further connected to an external ultra-wideband radar transmitter. The digitally controlled delay circuit is further connected to an external sampling pulse generation circuit for equivalent sampling. The ADC circuit is further connected to an external sampling gate for equivalent sampling. The main controller is further connected to an external server via Ethernet. The volume of an ultra-wideband ground penetrating radar control system is reduced.
    Type: Grant
    Filed: January 14, 2019
    Date of Patent: March 21, 2023
    Assignee: Nantong Institute of Nanjing University of Posts and Telecommunications Co., Ltd.
    Inventors: Zhikuang Cai, Xuanchen Qi, Wenhua Lin, Ji Wang, Jian Xiao, Yufeng Guo
  • Publication number: 20230070055
    Abstract: Disclosed are a precursor solution for a copper-zinc-tin-sulfur (CZTS) thin film solar cell, a preparation method therefor, and the use thereof. The present invention discloses two types of simple metal complexes which are capable of formulating a high-quality precursor solution.
    Type: Application
    Filed: November 15, 2022
    Publication date: March 9, 2023
    Applicant: Nanjing University Of Posts And Telecommunications
    Inventors: Hao XIN, Yifan ZHANG, Yuancai GONG, Chuanyou NIU, Ruichan QIU
  • Publication number: 20230074192
    Abstract: An unmanned aerial vehicle (UAV) task cooperation method based on an overlapping coalition formation (OCF) game includes: constructing a sequential OCF game model for a UAV multi-task cooperation problem; using a bilateral mutual benefit transfer (BMBT) order that is biased toward the utility of a whole coalition to evaluate a preference of a UAV for a coalitional structure; optimizing task resource allocation of the UAV under an overlapping coalitional structure by using a preference gravity-guided Tabu Search algorithm to form a stable coalitional structure; and optimizing a transmission strategy based on the current coalitional structure, an updated status of a task resource allocation scheme of the UAV, and a current fading environment, so as to maximize task execution utility of a UAV network. The method quantifies characteristics of resource properties of the UAV and a task, and optimizes the task resource allocation of the UAV under the overlapping coalitional structure.
    Type: Application
    Filed: January 20, 2022
    Publication date: March 9, 2023
    Applicant: Nanjing University of Aeronautics and Astronautics
    Inventors: Nan QI, Zanqi HUANG, Diliao YE, Luliang JIA, Yueyue SU, Kewei WANG, Wei WANG, Yijia LIU
  • Patent number: 11597659
    Abstract: Disclosed is a device for treating high-concentration organic wastewater by catalyst hydrothermal gasification, including a CHG reactor, a temporary wastewater storage tank and a condensing heat exchanger which are sequentially in loop connection. The CHG reactor includes a shell, a thermocouple, a water distribution device, and a packing support. The device of the present disclosure can quickly convert the high-concentration organic wastewater into clean energy or harmless gas at a low temperature under the action of a catalyst, so that the energy consumption of a treatment process is greatly reduced, and the treatment efficiency is improved. The device has potential application prospect.
    Type: Grant
    Filed: March 20, 2021
    Date of Patent: March 7, 2023
    Assignees: Nanjing University, Nanjing University-International Research Institute of Environmental Industries
    Inventors: Lu Lv, Linping Wang, Jie Rui, Qianlin Huang, Jingsheng Xu, Weiming Zhang, Bingcai Pan
  • Publication number: 20230038640
    Abstract: The present disclosure discloses a method for calculating the service life of a material under the action of a thermal shock load. The method includes steps of obtaining test results at different thermal shock temperatures and a thermal shock cycle number according to a thermal shock test, and calculating a temperature rise rate to temperature drop rate ratio Rv; calculating a corresponding stress intensity factor ?K according to a crack length a measured in the test; calculating a thermal stress ? at the notch and a notch stress concentration coefficient kt of the test specimen; calculating a stress intensity factor threshold ?Kth according to the crack length a measured in the test; and substituting the obtained the stress intensity factor ?K, stress intensity factor threshold ?Kth and temperature rise rate to temperature drop rate ratio Rv into a thermal fatigue crack growth model.
    Type: Application
    Filed: September 30, 2022
    Publication date: February 9, 2023
    Applicant: Nanjing University of Aeronautics and Astronautics
    Inventors: Zhigang Sun, Yingdong Song, Rutao Zhao, Xuming Niu, Yaning Chang
  • Publication number: 20230036667
    Abstract: The invention relates to the technical field of electrochemical machining and provides a pulse dynamic electrochemical machining apparatus and method for rapidly leveling a surface of a revolving part. During rotating pulse dynamic electrochemical machining, a cathode tool rotates around a center point of the cathode tool at a constant angular velocity, and an anode workpiece rotates around a center point of the anode workpiece at the constant angular velocity; meanwhile, the cathode tool performs a feed movement at a set feed velocity along a center line of the cathode tool and the anode workpiece. A control system determines a machining voltage value output by a power source when each contour point of the anode workpiece rotates to a machining area to automatically change an applied voltage between the cathode tool and the anode workpiece.
    Type: Application
    Filed: July 25, 2022
    Publication date: February 2, 2023
    Applicant: Nanjing University of Aeronautics and Astronautics
    Inventors: Dengyong WANG, Guowei CUI, Zengwei ZHU, Di ZHU
  • Publication number: 20230032755
    Abstract: A high-temperature biaxial strength tester for a CMC turbine vane includes a test stand, a thermal insulation box, a vane fixture, a biaxial loading device, thermocouples, a multi-channel thermometer, quartz lamps, a digital image correlation (DIC) system, and a cooling circulation system. The biaxial loading device includes two loading mechanisms arranged at 90° to each other. Each of the two loading mechanisms includes an electric cylinder and a ceramic push rod. One end of the ceramic push rod is connected to the electric cylinder, and the other end of the ceramic push rod extends into the thermal insulation box to contact an outer platform of the CMC turbine vane. The electric cylinder is provided with a load-displacement sensor. The thermocouples are arranged on the thermal insulation box. The quartz lamps are arranged inside the thermal insulation box. The multi-channel thermometer is connected to the thermocouples.
    Type: Application
    Filed: July 28, 2022
    Publication date: February 2, 2023
    Applicant: Nanjing University of Aeronautics and Astronautics
    Inventors: Xiguang GAO, Guoqiang YU, Yingdong SONG, Fangxiao SONG, Chuyang XIE, Yunfa JIA, Jinkang DU
  • Patent number: 11567512
    Abstract: An unmanned aerial vehicle (UAV) task cooperation method based on an overlapping coalition formation (OCF) game includes: constructing a sequential OCF game model for a UAV multi-task cooperation problem; using a bilateral mutual benefit transfer (BMBT) order that is biased toward the utility of a whole coalition to evaluate a preference of a UAV for a coalitional structure; optimizing task resource allocation of the UAV under an overlapping coalitional structure by using a preference gravity-guided Tabu Search algorithm to form a stable coalitional structure; and optimizing a transmission strategy based on the current coalitional structure, an updated status of a task resource allocation scheme of the UAV, and a current fading environment, so as to maximize task execution utility of a UAV network. The method quantifies characteristics of resource properties of the UAV and a task, and optimizes the task resource allocation of the UAV under the overlapping coalitional structure.
    Type: Grant
    Filed: January 20, 2022
    Date of Patent: January 31, 2023
    Assignee: Nanjing University of Aeronautics and Astronautics
    Inventors: Nan Qi, Zanqi Huang, Diliao Ye, Luliang Jia, Yueyue Su, Kewei Wang, Wei Wang, Yijia Liu
  • Patent number: 11557029
    Abstract: A method for detecting and recognizing surface defects of an automated fiber placement composite based on an image converted from point clouds, including: acquiring a surface point cloud of the automated fiber placement composite; fitting a plane to surface point data; calculating a distance from each point of the surface point cloud to a fitted plane; enveloping the surface point cloud by OBB, and generating a grayscale image according to the OBB and the distance; constructing a pre-trained semantic segmentation network for defect of fiber placement, and inputting the grayscale image to segment and recognize defect areas thereon; mapping a segmentation result output by the semantic segmentation network to the point cloud followed by defect evaluation and visualization.
    Type: Grant
    Filed: January 13, 2022
    Date of Patent: January 17, 2023
    Assignee: Nanjing University of Aeronautics and Astronautics
    Inventors: Zhongde Shan, Jun Wang, Anyi Huang, Qian Xie
  • Patent number: 11543034
    Abstract: A labyrinth sealing device for reducing gas intrusion is provided. A sealing bush is provided with a jet hole at the front of a tooth tip gap. The jet hole faces a tip of a corresponding sealing tooth. A gas flow injected by the jet hole suppresses hot gas flowing into the tooth tip gap. The sealing bush is provided with a first intercepting member at the rear of the tooth tip gap, and the sealing tooth is provided with a second intercepting member at the rear of the tooth tip gap. The first intercepting member hinders hot gas flowing against an inner wall of the sealing bush, and the second intercepting member hinders hot gas flowing against the sealing tooth, such that a part of the hot gas flows in a reverse direction and is violently mixed with subsequent hot gas.
    Type: Grant
    Filed: September 27, 2020
    Date of Patent: January 3, 2023
    Assignee: Nanjing University of Aeronautics and Astronautics
    Inventors: Bo Zhang, Yuanxiang Chen, Zhiguo Wang, Honghu Ji
  • Patent number: 11532121
    Abstract: A method for measuring a seam on aircraft skin based on a large-scale point cloud is disclosed. A point cloud density of each point in an aircraft skin point cloud is calculated. Seam and non-seam point clouds are divided according to a discrepancy of the calculated point cloud density. A point is selected from the point cloud of the seam area, and a section at the point is extracted. A certain range of the seam and non-seam point clouds is projected to the section and a projected point cloud is acquired. A calculation model of flush and gap is constructed, and the flush and the gap of the aircraft skin seam at the measuring point is calculated according to the projected point cloud and the calculation model.
    Type: Grant
    Filed: February 7, 2021
    Date of Patent: December 20, 2022
    Assignee: Nanjing University of Aeronautics and Astronautics
    Inventors: Jun Wang, Kun Long, Qian Xie, Dening Lu
  • Patent number: 11520934
    Abstract: A method for preventing a differential cryptanalysis attack is provided. The method is implemented by an adaptive scan chain, a control module, and a plaintext analysis module. The plaintext analysis module controls the adaptive scan chain, so that two plaintexts differing in the last bit of only one byte are input through scan chains with different structures. Consequently, the two input plaintexts for which differential cryptanalysis attack technology originally can be used to crack the key are unable to generate outputs that can be used by the differential cryptanalysis attack technology.
    Type: Grant
    Filed: March 12, 2021
    Date of Patent: December 6, 2022
    Assignees: Nanjing University Of Posts And Telecommunications, NANTONG INSTITUTE OF NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS CO., LTD.
    Inventors: Zhikuang Cai, Xun Xu, Ming Wang, Zixuan Wang, Henglu Wang, Jingqi Yao, Jiafei Yao, Yufeng Guo
  • Publication number: 20220364040
    Abstract: Provided is a reaction apparatus for comprehensively measuring biodegradability of a material, comprising a device frame, an electrical control cabinet and a reaction chamber monomer. The upper side of the reaction chamber monomer is a reaction chamber body, and the lower part is a material receiving trolley. The top of the reaction chamber body is sealed by a chamber cover. A side wall is pasted with an electric heating plate and a thermal insulation cotton. A stirring paddle is arranged inside. An air inlet and an air outlet are respectively provided on a front and a rear wall. A discharging mechanism is located below. The electrical control cabinet separately controls the reaction conditions of each reaction chamber monomer. The present invention further relates to a use method thereof, which can realize the biodegradability evaluation in such three aspects as material degradation rate, disintegration rate and ecological non-toxicity test.
    Type: Application
    Filed: May 11, 2021
    Publication date: November 17, 2022
    Applicant: Nanjing University
    Inventors: Zengwei YUAN, Yumei WANG, Zhanlong WANG
  • Patent number: 11503057
    Abstract: An intrusion detection method and system for Internet of Vehicles based on Spark and combined deep learning are provided. The method includes the following steps: S1: setting up Spark distributed cluster; S2: initializing the Spark distributed cluster, constructing a convolutional neural network (CNN) and long short-term memory (LSTM) combined deep learning algorithm model, initializing parameters, and uploading collected data to a Hadoop distributed file system (HDFS); S3: reading the data from the HDFS for processing, and inputting the data to the CNN-LSTM combined deep learning algorithm model, for recognizing the data; and S4: dividing the data into multiple resilient distributed datasets (RDDs) for batch training with a preset number of iterations.
    Type: Grant
    Filed: October 20, 2021
    Date of Patent: November 15, 2022
    Assignee: Nanjing University of Science and Technology
    Inventors: Yong Qi, Jianye Yu