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287 results about "Rate parameter" patented technology

Rate parameter. Some families of distributions use a rate parameter which is simply the reciprocal of the scale parameter.

Multiple-working-condition automatic testing experiment system of electric vehicle charging equipment

The invention discloses a multiple-working-condition automatic testing experiment system of electric vehicle charging equipment, belonging to the field of a new energy vehicle. The system is formed by an industrial computer and software system, a voltage and frequency controlled AC power supply unit, a load unit, a high precision measurement unit, temperature and humidity adjusting equipment, and a protection and control unit. The system is used for testing an electric vehicle vehicle-borne charger and a non vehicle-borne charger. According to the system, grid voltage and frequency static deviation, voltage and frequency fluctuation, a power battery pack with different rated parameters and different temperature and humidity conditions can be simulated to test the communication performance, output stability, output accuracy, protection limit characteristic, temperature rise characteristic, current harmonic wave, voltage fluctuation and flicker, three-phase unbalance, power factor, efficiency and abnormality response ability of experiment charging equipment, certain data support is provided for the research of electric vehicle charging equipment technical specifications, the whole process automatic control of the testing is realized, and the testing efficiency is greatly improved.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)

Deformable convolutional neural network-based infrared image object identification method

The invention discloses a deformable convolutional neural network-based infrared image object identification method. The method comprises the steps of constructing a training set and a test set; establishing a convolutional neural network architecture; adding a softmax classifier to the last layer, and setting an objective function; performing sampling by adopting a convolution kernel of linear ornonlinear deformation; performing pooling operation in a pooling layer by adopting a rule block sampling-based ROI pooling method which is the best in the industry at present; setting learning rate parameters according to experience; and easily performing standard back propagation end-to-end training, thereby obtaining a deformable convolutional neural network. An experiment proves that the spatial geometric deformation learning capability is introduced in the convolutional neural network, so that an identification task of an image with spatial deformation is better finished; the geometric transformation modeling capability of the convolutional neural network and the effectiveness of target detection and visual task identification are improved; and dense geometric deformation in space issuccessfully learnt.
Owner:GUANGDONG POWER GRID CO LTD +1

Method for monitoring thermal runaway of lithium ion battery of electric vehicle

The invention relates to a method for monitoring thermal runaway of a lithium ion battery of an electric vehicle. A voltage changing rate parameter when thermal runaway occurs in the lithium ion battery is monitored, and a battery voltage can be reduced abruptly, is maintained at a low voltage for 40-60 seconds and then is gradually raised to an initial voltage when the thermal runway occurs in the lithium ion battery; the fact that thermal runaway occurs in the battery can be judged by taking the battery voltage changing rate parameter as a monitoring object and is a first judgment method; abattery temperature rising rate changing parameter is monitored, the fact that thermal runaway occurs in the battery also can be judged when the battery temperature rising rate is larger than or equalto 10 DEG C per minute and is a second judgment method; and a battery management system (BMS) is used for monitoring, analyzing and judging the battery voltage changing parameter and the battery temperature rising rate parameter, the two methods are used as an independent condition or a logic combination condition and used as a technological basis for judgment on thermal runaway of the battery, and an early-warning signal can be given out in advance when thermal runaway occurs. By the method, the battery thermal runaway judgment time is greatly increased, and enough handling time is providedfor a person to escape and timely take a measure to prevent battery thermal runaway from being generated, propagating and being expanded.
Owner:应急管理部天津消防研究所

Moving target detection method for carrying out Bayes judgment based on color-texture dual characteristic vectors

The invention provides a method for carrying out Bayes judgment on modeling for a video image based on color-texture dual characteristic vectors so as to realize moving target detection. The method comprises the following steps: 1. obtaining a video frame; 2. preprocessing an image; 3. background modeling and carrying out motion detection by utilizing Bayes judgment, wherein the background modeling comprises image color-texture dual characteristic vectors, respectively adopting different characteristic vectors according to the variation of interframe difference of a pixel point, expanding the original Bayes judgment to be two-dimensional due to the independence of the characteristic vectors, setting model parameters and updating control parameters so as to adapt to the change of the state of a moving object; 4. shadow detection, using a texture model to detect a shadow candidate point and eliminating the shadow; 5. processing after the detection, using horizontal projection and vertical projection to determine a foreground area and perfecting the detection result in a divided area through block analysis; and 6. updating a background image, respectively updating according to a detection classification result and setting self-adaptive updating rate parameters so as to adapt to illumination change.
Owner:BEIJING UNIV OF POSTS & TELECOMM

System and method for improving audio speech quality

The invention discloses a system and a method for improving audio speech quality comprises the following steps that: firstly, preemphasis and Fourier transform treatment of the current frame of time domain first audio signal output by an audio collecting device and the current frame of the time domain second audio signal output by an audio playing device are completed; secondly, according to the frequency domain error signal parameter and frequency domain learning rate parameter obtained by the previous frame of the current frame, a frequency domain second audio signal is corrected; thirdly, de-emphasis treatment and subtraction of the first audio signal and the second audio signal are completed, thereby eliminating the echo in the first audio signal; meanwhile, according to the corrected time domain second audio signal and frequency domain second audio signal and preemphasized time domain first audio signal, the frequency domain error signal parameter and frequency domain learning rate parameter of the current frame are calculated and used for the treatment of the next frame, thereby effectively eliminating speech echo; in addition, through estimating the residual echo and noise of the audio signal with the echo eliminated, the invention effectively eliminates the noise in the audio signal and greatly improves the speech quality.
Owner:SHANGHAI AVCON INFORMATION TECH

Method for triggering LBT (Listen-before-talk) random backoff mechanism in LTE LAA (Long Term Evolution Licensed-Assisted Access)

The invention relates to a method for triggering a listen-before-talk (LBT) random backoff mechanism in long term evolution licensed-assisted access (LTE LAA). The method comprises the steps of evaluating a current channel to obtain a first parameter representing a congestion state of the current channel, comparing the first parameter with a first threshold to obtain a first comparison result, and adapting the size of a contention window according to the first comparison result. The method further comprises the steps of comparing the first parameter with a second threshold to obtain a second comparison result, and adapting the size of the contention window according to the second comparison result. The first parameter is a packet error rate parameter or a collision parameter. The method innovatively uses the comparison between the first parameter representing the congestion state of the current channel and the threshold to correspondingly increase or decrease the size of the contention window according the comparison result, so that the fairness with other systems, such as a WiFi system, is guaranteed, the utilization rate of communication resources and the performance of the whole wireless communication system are also improved correspondingly.
Owner:ALCATEL LUCENT SHANGHAI BELL CO LTD +1

Loss expenditure calculating method for electric vehicle battery participating in power grid dispatching

The invention discloses a loss expenditure calculating method for an electric vehicle battery participating in power grid dispatching. An aggregator determines a work mode of an electronic vehicle in a current work period in real time through an intelligent control algorithm; the charge and discharge rate, discharge depth and the number of circulation times of the electronic vehicle battery are obtained; the attenuation rate of the number of battery circulation times and the attenuation rate of battery capacity generated due to temperature and the attenuation rate of the number of battery circulation times generated due to discharge depth are calculated; according to the rated number of circulation times of the battery, the number of circulation under V2G application is calculated; degradation cost of the battery is calculated according to the number of circulation times; finally, loss expenditure of the battery in the current work period is calculated according to attenuation rate parameters of the current work period. Influences of temperature and discharge depth on the number of circulation times of the battery are combined, battery temperature rise caused by changes of internal impedance of the battery is introduced, and loss estimation of the battery is more precise and accords with actual situations better.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Machine learning-based server energy consumption prediction method and system

The invention relates to a machine learning-based server energy consumption prediction method and system. The method comprises the following steps: separately collecting system resource utilization rate and real-time energy consumption of a server under a zero load state, a low load state and a high load state, as a zero load training set, a low load training set and a high load training set; respectively, inputting the zero load training set, the low load training set and the high load training set into a machine learning model for training, and generating a zero load energy consumption model, a low load energy consumption model, and a high load energy consumption model; according to the to-be-predicted system resource utilization rate of the server, selecting the zero load energy consumption model, or the low load energy consumption model, or the high load energy consumption model to predict the energy consumption value of the server, wherein the system resource utilization rate comprises the memory utilization rate, the network bandwidth utilization rate, the disk utilization rate, and the CPU utilization rate, thereby improving the prediction accuracy and practicability by expanding the collected system resource utilization rate parameters and the segmentation training models.
Owner:INST OF COMPUTING TECH CHINESE ACAD OF SCI
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