7results about How to "Reduce choice" patented technology

The invention discloses an Internet of Things equipment identification method and device based on machine learning, and the method comprises the steps: obtaining a data set containing network flows of Internet of Things equipment, carrying out the data preprocessing, obtaining a plurality of network flows, extracting a plurality of flow features from the network flows through a plurality of feature selection algorithms, so as to determine an optimal feature subset, and carrying out the recognition of the Internet of Things equipment. The method comprises the following steps: inputting a trained machine learning model to carry out Internet of Things equipment identification to obtain an equipment identification result, respectively carrying out comparative analysis based on a feature selection algorithm corresponding to the equipment identification result to complete Internet of Things equipment identification, and evaluating the effectiveness of network traffic features by adopting various feature selection algorithms. According to the method, the BGWO is introduced to determine the optimal feature subset of the identification of the Internet of Things equipment to fit the optimal model and realize the optimal accuracy among different classifiers, the reliability of the identification result is ensured by using two public Internet of Things network flow data sets, the performance of the classifiers is improved, and the BGWO realizes higher accuracy in all the classifiers.

The invention relates to the field of preparation of natural products, and particularly provides self-assembled granules for improving the auxiliary gastric mucosa protection effect of piperine and a preparation method of the self-assembled granules. The method comprises the following steps: dissolving piperine and mallotus oblongifolius polyphenol, mixing, adjusting the pH value, heating, concentrating, purifying and drying. According to the piperine self-assembly nano-particles and the preparation method thereof, the problems that in the self-assembly process of natural products, the structure is complex, and subtle equilibrium relation exists among compounds are solved, the piperine self-assembly nano-particles are successfully prepared, and the piperine auxiliary gastric mucosa protection capacity can be remarkably improved only by 20 mg / kg and b.w. In addition, the piperine and the mallotus oblongifolius polyphenol are separated and recovered based on the natural eutectic solvent aqueous two-phase system, the method has the advantages of being large in extraction amount, easy to operate, mild in preparation condition, high in selectivity, environmentally friendly and efficient, and the problems that a traditional extraction separation method is difficult in purified product recovery, low in selectivity, low in efficiency and the like are solved.

The present invention provides a bucket and an excavator having the bucket, the bucket comprising a bucket body and a plurality of shovel teeth fixed on the bottom edge of the shovel mouth of the bucket body, the plurality of shovel teeth being fixedly arranged in sequence along the bottom edge at intervals; along the width direction of the bucket body, the bottom edge has a plurality of spaced-apart concave valleys to set the corresponding shovel teeth; the tooth tails of the shovel teeth are provided with adapting grooves, the upper and lower groove walls of the adapting grooves are respectively adapted to the upper and lower surfaces of the bottom edge at the valley area. The application of this solution can effectively solve the problem that the existing bucket cannot effectively take into account the high bearing strength and deadweight of the bucket. By optimizing the fixed adapting structure of the shovel teeth, the geometric shape of the bucket is changed, thereby weakening the demanding requirements on the mechanical properties of the material, thereby effectively reducing the selection of high-cost materials; this solution can ensure the reliability and safety of the comprehensive use performance with low material costs and manufacturing costs, and has the operability of convenient repair.

The application discloses a kind of unmanned aerial vehicle cluster security obstacle avoidance methods and systems for complex low-altitude airspace;Belong to unmanned aerial vehicle cluster control technical field;The method obtains the communication connection state of each unmanned aerial vehicle, current flight state, task track and shared obstacle avoidance intention before communication break, constructs cluster communication topology and identifies communication subgroup when there is broken edge;Predict the candidate obstacle avoidance channel and predicted arrival time of each communication subgroup within the preset non-communicable time window, judge the channel occupation risk in combination with subgroup size and channel boundary;When there is risk, different communication subgroups are allocated mutually exclusive obstacle avoidance channel or staggered passing time, and converted into local obstacle avoidance control instruction;After communication recovery, check execution deviation and modify subsequent task track.The method can reduce the risk of obstacle avoidance channel occupation and channel exit convergence in communication partition scenario.

The utility model discloses a cylinder shaft hub motor, which has the advantages that at least one side of a second connecting part of a key body connected between a planet carrier and a cylinder shaft is connected with an extension part which exceeds a first connecting part and extends along the circumferential direction of the cylinder shaft, and the extension part is propped against the cylinder shaft to limit the key body to move inwards along the radial direction of the cylinder shaft; the extending part enables the width of the second connecting part to be larger than the width of the first connecting part and the width of the key groove, a step or a resisting part is formed between the first connecting part and the second connecting part, and after the planet carrier is connected, the inner end of the extending part abuts against the outer side wall of the cylinder shaft beside the key groove for limiting. Deformation of the bottom of the key groove is effectively reduced or avoided, the barrel shaft is not prone to being damaged, the mechanical strength of the barrel shaft is prevented from being weakened, and influences on a barrel shaft rod in the barrel shaft are avoided; in addition, the second connecting part is widened, so that the planet carrier and the barrel shaft are firmly connected, the stability is good, and looseness of the planet carrier and abnormal sound generated by looseness are avoided.

The embodiment of the invention provides a control method and device applied to a buck converter, and the method comprises the steps: obtaining a discrete time model which is used for the iterative calculation of a state variable value in a corresponding switching period according to the switching state of a switching tube in the buck converter; obtaining an input matrix in the discrete time model corresponding to the current switching period through a polynomial fitting method; based on the discrete time model, according to the input matrix corresponding to the current switching period and the state variable value corresponding to the current switching period, calculating to obtain a state variable value of a next switching period; calculating the optimal duty ratio of the next switching period according to the state variable value of the next switching period; and when the next switching period arrives, controlling the output voltage to reach the target voltage according to the optimal duty ratio. According to the embodiment of the invention, the switching frequency of the switching tube can be improved, the size of a product is reduced, and the light requirement is met.

The utility model discloses a novel vertical flash tank relates to vertical flash tank technical field, and it aims at solving the problem that the uniform separation of gas and liquid in the cylinder must be ensured, and the cylinder must be left enough liquid phase and gas phase space, and the proportion is usually 1:3, namely 25% liquid phase space 75% gas phase space, which leads to the problem that the cylinder must select larger, and its technical scheme main points are including the flash tank body, the installation base is fixedly connected with the flash tank body lower extreme, the flash tank body upper extreme fixedly connected with the head, the head upper extreme fixedly connected with the gas supplementing pipe, the flash tank body left side fixedly connected with the liquid outlet pipe that communicates with the inside of flash tank body, the flash tank body right side fixedly connected with the liquid inlet pipe that communicates with the inside of flash tank body, the liquid inlet pipe lower end face is higher than the liquid outlet pipe upper end face. Reach the simple structure, and the good commonality of spare part can realize the effect of larger scale production.