129results about How to "Reduce the number of runs" patented technology

The invention discloses a nursing home old man dangerous act monitoring method. The problems of low old man tracking accuracy, poor behavior analysis effect, frequent behavior recognition algorithm calling, large system load, excessive dependence on device performance of a monitoring effect and the like in the prior art are overcome. The method is characterized in that a monitoring camera, a video capture card, a personal PC machine, a display and an alarm sound box are used to be combined with a contour detection program module, a tracking program module and a behavior recognition program module in the personal PC machine; and the method based on the combination of target tracking and behavior recognition monitors the movement states of old men in a nursing home in daily life and gives an alarm due to the risks and the abnormal behaviors of the old men. The method has the advantages of high monitoring efficiency, high old man behavior recognition degree, low operation cost and good practicability and application prospect.

The invention discloses an elevator control method based on face recognition. The elevator control method includes the steps that face image information is collected, and a matched database is established; the elevator control authority of each elevator user is set; and face information of each person entering an elevator is obtained and is matched with the face information in the matched database, and whether the ban on an elevator panel button control module is lifted or the ban is put on the elevator panel button control module is judged according to whether matching succeeds or not. According to the elevator control method, face recognition of elevator persons can be achieved, authority distribution is conducted on the elevator persons typed in the database, the visitor authority of each floor can be set, and the safety grade of a building is improved; and meanwhile, face recognition is adopted, and face recognition is more convenient and faster compared with traditional card reading and fingerprint recognition.

The invention discloses an encryption and search method for revocable keyword search public keys in cloud storage and belongs to the technical field of network security. The method includes: setting system public parameters and dividing system time into z time segments, and creating a public-private key pair at a client; when data storage requests occurs, selecting a keyword collection of a data file, selecting optional symmetrical encryption algorithm to encrypt the data file, utilizing the public key and the current time segment to encrypt the keyword collection, and transmitting the encrypted keyword collection to the cloud server; when the next time segment arrives, generating keyword collection cipher again, and updating the cloud server on a server; when a keyword search request occurs, by the client, utilizing the private key and the current time segment to calculate trap door information of the keywords, transmitting the trap door information to the cloud server, and by the cloud server, obtaining the search results and sending back file cipher containing the search keywords to users. The encryption and search method is suitable for cloud storage with high safety requirements, safe, and efficient, and has the capability of revoking server search.

The embodiment of the invention discloses a video frame rendering method and a video frame rendering device. The video frame rendering method comprises the following steps: receiving a rendering instruction of a user and a to-be-rendered video frame; analyzing the rendering instruction, and determining special effects corresponding to the video frame and an action time interval of each special effect; extracting the identifier information of the determined special effects, and determining GLSL (open graphics library shading language) programs corresponding to the special effects, wherein each special effect corresponds to one GLSL program; respectively judging whether each special effect corresponding to the video frame meets a preset rule according to the action time interval of each special effect and the extracted identifier information of each special effect; combining the GLSL programs corresponding to the special effects which meet the preset rule to obtain a combined GLSL program; executing the combined GLSL program and the GLSL programs corresponding to the special effects which do not meet the preset rule to obtain a rendered special-effect frame. According to the technical scheme, the execution frequency of the GLSL programs is reduced, and the transfer frequency of repeating data is reduced, so that the rendering efficiency is improved.

The invention discloses a parallel inverter system capable of realizing structure reorganization and a control method of the system. Structure reorganization of the parallel inverter system can be realized at any time through control on IGBT (insulated gate bipolar transistor) switch states of inverters, a parallel inverter structure is endowed with a function for parallel connection / removal of the inverters at any time, that is, under the condition that the parallel inverter system works, the N inverters can be connected in parallel or disconnected randomly so as to be matched with loads, and the overall efficiency of the system is improved; the structure has the function for parallel connection / removal of the inverters at any time, that is, under the condition that the parallel inverter system works, the N inverters can be connected in parallel or disconnected randomly; active power control and reactive power control can be provided simultaneously, meanwhile, ZSCC (zero-sequence circulating current) suppression can also be realized through adoption of prediction control on the redundant zero switch state; besides, the system does not affect current and voltage vectors on the alternating current side.

Disclosed are a system and method for managing the excessive distribution of a memory. In the present invention, based on page sharing technology, by collecting the software types of virtual machines running in each server in a trunking, the virtual machines with similar running software types are migrated from the server to a designated server, so that the page sharing effect among the virtual machines is better and the excessive distribution effect of the memory is better; and meanwhile, no waste of the bearer capability of the servers in the system is ensured. The optimal cooperation of the utilization rate of the memory of the entire system and the utilization rate of resources is achieved and the memory of the entire trunking system is better distributed. Meanwhile, the present invention reduces the number of running servers, saves energy and operation cost, reduces the environmental pressure, reduces the discharge of carbon dioxide and has great social benefits and economic benefits.

The invention discloses a grid-connected photovoltaic inverter device and a control method for improving conversion efficiency thereof and belongs to the field of inverter control. The device comprises N grid-connected photovoltaic inverters, wherein a voltage outer loop control circuit (3) of each grid-connected photovoltaic inverter comprises a bus voltage sampling circuit (301), first and second bus voltage regulators (302 and 303), first and second amplitude limiting circuits (304 and 305) and three voltage loops. The control method comprises that: given voltage in different grades is respectively set for the bus voltage regulators of the plurality of grid-connected inverters; along with the increase of the input power, the inverters work in turn according to the given voltage, and the light load efficiency is improved by reducing the number of the operating inverters under the condition of light load; and different set values and output amplitude limiting values are applied to a linear bus voltage regulator of a single grid-connected inverter so as to ensure that the inverters can operate at the highest efficiency preferentially under different power grades, and the overall efficiency of the system is improved.

The invention belongs to the field of information security and privacy protection, and particularly relates to an NTRU type multi-key fully-homomorphic encryption method with a rapid homomorphic operation process, which comprises the following steps of: 1, optimizing a DHS16 scheme, and constructing a single-key fully-homomorphic encryption scheme; 2, converting the efficient single-user fully-homomorphic encryption scheme in the step 1 into a multi-key fully-homomorphic encryption scheme by utilizing a construction method of the multi-key fully-homomorphic encryption scheme in an LATV12 scheme; Step 3, constructing an independent distributed decryption process on the basis of the multi-key full homomorphic encryption scheme in the step 2, and constructing two rounds of MPC protocols on the basis of the independent distributed decryption process; The method can be effectively applied to secure multi-party computing among multiple users in a cloud computing environment, and has the excellent characteristics of confidentiality, ciphertext availability, collusion attack resistance, quantum attack resistance, capability of allowing the users to participate in independent decryption andthe like.

The invention discloses a traffic simulation correction method based on a genetic algorithm and a generalized recurrent nerve network. The method includes the following steps that firstly, average travel time of vehicles is selected and serves as an evaluation index, and a target of parameter correction is determined; secondly, need traffic data are collected so that a traffic simulation model can be established, needed parameters to be corrected and a corresponding value range are determined; thirdly, optimizing computing is performed on values of the determined parameters to the corrected with the genetic algorithm, and a combination of the corrected parameters after the iteration of the genetic algorithm is predicated with the generalized recurrent nerve network, when the combination of the corrected parameters after the iteration of the genetic algorithm is matched with the target of parameter correction, the corresponding combination of the corrected parameters is output, and if the combination of the corrected parameters after the iteration of the genetic algorithm is not matched with the target of parameter correction, iteration is conducted continuously with the genetic algorithm until the combination of the corrected parameters after the interaction is matched with the target of parameter correction after the test of the generalized recurrent nerve network. According to the traffic simulation correction method based on the genetic algorithm and the generalized recurrent nerve network, the high efficiency of parameter calibration correction is achieved, the accuracy of parameter correction is ensured, the application range is wide, and the method is safe and reliable.

The invention discloses a method and system for lowering the temperature of a whole mobile terminal. The method comprises the following steps that S1, it is defected that a mobile terminal camera module operates, the real-time temperature T1 of the whole mobile terminal is detected in real time in the operating process; S2, whether the detected real-time temperature T1 exceeds a preset temperature threshold T is judged, wherein the preset temperature threshold T is a fixed value, and when the real-time temperature T1 exceeds the preset temperature threshold T, it is judged that the temperature is too high; S3, the camera module conducts lowers frame read rate according to the real-time temperature T1, the real-time temperature T1 of the whole mobile terminal is detected in real time in the operating process, and when the real-time temperature T1 reaches a preset temperature threshold T or is lower than the preset temperature threshold T, a normal frame read rate is recovered. The method can quickly lower the temperature, so that good experience is brought to a user.

The invention aims to deal with overlarge testing data number to provide a testing data compression and decompression method based on ortho-position exclusive-or operation, and the testing data compression and decompression method can reduce the partition number and increase the shortest run length by using a ortho-position exclusive-or method to combine consecutive 01 or 10 sequences into a codeword, wherein the consecutive 01 or 10 sequences are respectively sued as one codeword of one run; and experimental results show that the compression ratio is further improved. Through the decoding analysis, additional hardware overhead of a decoding structure of the method is less, and the method is independent of a circuit being tested, so that the method has excellent ratio of compression rate to hardware overhead.

The invention is applicable to the technical field of uninterruptible power supplies, and provides a control method and a control device of a multi-system uninterruptible power supply, a control terminal and a computer readable storage medium. The control method comprises the following steps of: acquiring the load rate of a multi-system uninterrupted power supply; acquiring a working mode of the multi-system uninterrupted power supply; determining whether the load rate is smaller than a preset first threshold value or not; and if the load rate is smaller than the first threshold value, reducing the operation number of the power units of the multi-system uninterrupted power supply corresponding to the working mode. According to the invention, the operation efficiency of the multi-system uninterrupted power supply under a light load condition can be improved.

The invention discloses a method for cooling stainless steel slag, which comprises the steps as follows: (1) a step of preparing steel slag: after deslagging, the stainless steel slag is shifted to a stainless steel processing station, the steel slag is broken to pieces below 500 mm, and the steel slag is poured into a hot braised pool; (2), a step of open water-cooling: spray interval water-cooling is performed on the steel slag in the hot braised pool in step (1); and (3), a step of hot braised water-cooling: closed water-cooling is performed on the steel slag after the step (2), and hot braise and cooling are performed until total water consumption amount of steel slag per ton ranges from 0.4 ton to 0.6 ton. The method for cooling the stainless steel slag shortens the cooling processing period of the stainless steel slag, restrains dust raising pollution in a dusting cooling process, and reduces purchasing quantity of slag pots and places occupied by cooling.

The invention discloses a dustproof and ventilation system of automatically cleaning filter screen in a machine room, which has the characteristics that: an air return port frame (1) of the ventilation system is connected with a step motor (3), bars (4), a fold filter screen (5), anti-theft steel ribs (6), combination screws (7), a fan blade, a saw-toothed brush (9), a swing arm guiding rod (10) and a fan motor, the bars (4) is connected with the saw-toothed brush (9) and the left and right side edges of the air return port frame (1), a filter screen mounting port is arranged in the upper or the lower part of the air return port frame (1), the fold filter screen (5) is connected with a handle (2) and is arranged in the rear part of the saw-toothed brush in the filter screen mounting port of the air return port frame (1), the step motor is fixed with the saw-toothed brush which is connected with the bars in the side face of the air return port frame driven by the swing arm guiding rod, the saw-toothed brush is moving up and down along the fold filter screen, a switch for synchronously starting on the step motor and a fan blade reverse switch for one minute is arranged, when cleaning, the wind power of the fan blade reversion is used, in combination with the saw-toothed brush operation, the dust is expelled out of a room, and the purpose of automatically cleaning is achieved.

The present invention discloses an interface drawing method and apparatus, a terminal and a storage medium, and belongs to the technical field of internet. The method comprises: receiving a window drawing instruction, and determining window display information of to-be-drawn windows, wherein the drawing instruction is used to indicate to perform drawing operations of the to-be-drawn windows; according to the window display information of the to-be-drawn window, acquiring a target sub-thread corresponding to the to-be-drawn windows, wherein each sub-thread is used to perform drawing operationsof a plurality of windows with the same window display information; and according to the window drawing instruction, performing the drawing operations of the to-be-drawn windows by using the target sub-thread. According to the technical scheme of the present invention, by allocating a sub-thread for a plurality of windows with the same window display information, the number of actually running sub-threads is reduced, the system overhead is greatly reduced, and the resource utilization is improved.

The invention relates to a tap water pipe burst monitoring system, which is characterized in that an automatic monitoring center is arranged, a plurality of main pipeline stations and a plurality of branched pipeline stations are arranged in sequence, each station is provided with a flow and pressure transmitter, and when a flow and pressure signal collected by one station is abnormal, the system can automatically close the closest valve ahead of the pipeline, and make a sound alarm at the automatic monitoring center. According to the tap water pipe burst monitoring system, the automatic monitoring center comprises an industrial personal computer; the industrial personal computer is internally provided with a storage and 'water plant remote data collecting and monitoring system software V1.0 configuration software' and is connected with a wireless data receiving device, and each branched pipeline station is provided with a pressure sensor, a flow sensor and a GPRS (general packet radio service) wireless transmitting module and is used for measuring, collecting and feeding back the water pressure and flow.

The invention relates to an intelligent ordering system and an ordering method thereof. The intelligent ordering system comprises a data server, and a desktop ordering media terminal, a mobile ordering terminal, a cashier terminal, a workbench terminal, a calling service terminal, a kitchen intelligent terminal and an online media distribution platform which are in interactive connection with thedata server in a wired or wireless manner. According to the invention, the ordering efficiency is greatly improved, the customer can quickly obtain the restaurant service through the desktop orderingmedia equipment, the running times of the waiters are reduced, and the service efficiency is improved; A powerful data basis is provided for performance assessment of kitchen personnel in a restaurant, multiple purposes are embodied, the enthusiasm of the personnel is fully aroused, and the working efficiency is improved.

The invention discloses a deduster airduct intelligent spray settlement device. The device comprises a dust collection airduct, branch pipes intensively connected to an inlet of the dust collection airduct and a bag filter connected to an outlet of the dust collection airduct. The device also comprises an intelligent controller, a dust concentration detector and a spray settlement chamber connected to the middle of the dust collection airduct. A flow baffle is medially arranged in the spray settlement chamber. A flow baffle settlement chamber is medially arranged at the top in the spray settlement chamber. A flow baffle is medially arranged in the flow baffle settlement chamber. A funnel-shaped upper air flue and a funnel-shaped lower air flue communicated with the spray settlement chamber are symmetrically arranged on the flow baffle settlement chamber bottom at left and right sides of the flow baffle as a symmetric center and extend downward. The top of the spray settlement chamber is provided with a spray device connected to a water pool. The device is designed according to a gravity settlement principle, adopts an automatically adjustable spray device, solves the problems of excess internal dust, overlarge deduster load, non-ideal dedusting effects and explosion easiness, is safe, energy saving and environmentally friendly, can be operated simply, and has a low equipment investment cost.

The invention discloses a refrigerator which comprises a refrigerator body, a door body, storage racks, an air flue cover plate, an evaporator and a fan, wherein a refrigerating chamber is arranged in the refrigerator body; the door body is mounted on the refrigerator body; the storage racks are arranged on walls of the refrigerating chamber, so as to separate the refrigerating chamber into a plurality of storage spaces; the air flue cover plate is arranged in the refrigerating chamber; an air outlet channel is formed between the air flue cover plate and a rear wall of the refrigerating chamber; a plurality of air outlets are arranged in the air flue cover plate at intervals along vertical direction; the air outlets are respectively and correspondingly communicated with the storage spaces; the evaporator is located in an air flue; the upper part of the evaporator is arranged on the rear wall of the refrigerating chamber; the lower part of the evaporator and the rear wall of the refrigerating chamber are separated for a preset distance; and the fan is arranged in the air flue and is used for blowing cold air in the air flue into the storage spaces. The refrigerator provided by the embodiment of the invention has the advantages of high refrigerating efficiency, low energy consumption, and the like.

The invention discloses a solar power generation apparatus. The solar power generation apparatus comprises a supporting base, wherein the supporting base is connected with a supporting inclined plate; a speed reducer is fixedly mounted on the supporting inclined plate; a stepper motor is fixedly mounted on the speed reducer; the output shaft of the speed reducer is connected with a polar shaft; one end of the polar shaft is rotationally connected with a fixed sleeve; a linear motor is fixedly mounted on the fixed sleeve; the output shaft of the linear motor is rotationally connected with a power generation assembly; the power generation assembly comprises a frame body; a tapered groove is formed in the frame body; multiple light cones for focusing solar rays are mounted in the tapered groove in an array manner; Fresnel lenses are mounted on the upper surfaces of the light cones; solar cell chips are mounted at the bottoms of the light cones; an aluminium substrate is mounted at the bottoms of the solar cell chips; a radiating plate is tightly adhered to the bottom of the aluminium substrate; and an insulator is mounted below the radiating plate. The solar power generation apparatus provided by the invention can realize solar tracking power generation; and meanwhile, the power generation assembly is small in volume, light in the overall weight, and stable in operation.

The invention discloses a power transmission line three-dimensional design method and system, and the method comprises the steps: carrying out the live-action modeling of the landform of a region where a to-be-constructed line region is located, and obtaining a three-dimensional model of the to-be-constructed line region; establishing a power transmission line component model database; planning and designing a power transmission line path in the three-dimensional model and carrying out tower ranking design to complete three-dimensional construction of the power transmission line; and outputting the three-dimensional model of the power transmission line. The system comprises an oblique photography module, a three-dimensional design module and a VR display module which are connected in sequence, the oblique photography module is used for acquiring oblique photography data of a line area to be constructed; the three-dimensional design module is used for generating a three-dimensional model of the line area to be constructed, performing three-dimensional design of a power transmission line, acquiring the three-dimensional model of the power transmission line and displaying the three-dimensional model; and the VR display module is used for stereoscopically displaying the three-dimensional model of the power transmission line. According to the method, accurate design can be achievedin the preliminary design stage, major changes in the construction drawing stage are avoided, the design efficiency is improved, and manpower and material resources are saved.

The invention relates to the field of communication technologies, in particular to a method of displaying a video list and a video client. The method of displaying the video list and the video client solve the problems that when the video list has videos with the same title names and different contents, the required version is determined through playing the videos, a play program needs to be rerun after playing the video each time, so that a terminal of a video client probably needs to consume more processing resources to play the video which is expected by a user in the prior art. According to the embodiment of the invention, video titles comprise picture information used for describing the videos and character title information of the videos, when the video list has the videos with the same title names and different contents, the version of one video is determined through the picture information in each video title, so that the user can obtain the expected video without playing for many times, the running time of the play program is reduced, and the processing resources of the terminal are saved.

The invention provides a mobile railway station, a matching track network and a combined system of the two, belonging to the field of rail transit and urban rail transit. The combined system deeply integrates railway rail transit and urban rail transit, and changes the fixed train station into a mobile train station, which not only enables the train to get on and off passengers, greatly improves the operating efficiency of the train, and saves about 400 billion trains Occupying fixed assets has also greatly increased the coverage and frequency of train stops, and shortened the waiting time for passengers. At the same time, through the deep integration of mobile railway stations and urban rail transit, it has effectively evacuated the passenger flow of railway passengers and resolved the impact of railway passenger flow on urban traffic. The congestion caused by it greatly satisfies the passenger's demand for nearby rides, improves the quality of railway services, increases the market share of railway transportation, and reduces the harm caused by road transportation to the environment, which has significant social and economic benefits .

The invention relates to an adaptive front lighting system (AFS) control method and an AFS control device. The method comprises the following steps of: counting the frequency of occurrence of a lighting angle of each AFS headlight, and acquiring the lighting angle corresponding to the frequency of occurrence exceeding a threshold; and performing control to keep the lighting of the AFS headlight in the lighting angle. The method and the device avoid the frequent resetting of the lighting angle of the AFS headlight in the stopped state of a vehicle to make more humanized the AFS headlight, reduce the frequent movement and abrasion of an AFS kinematic pair and the running times of a system, prolong the service life of the system, ensure the reliability of the AFS and save the cost; and the AFS is implemented by a simple method without greatly altering the conventional AFS, and has relatively higher practicability.

The invention relates to a control method for a butterfly power generation two-axis tracking structure based on a polar axis coordinate system and belongs to the field of solar power generation. The control method for the butterfly power generation two-axis tracking structure based on the polar axis coordinate system is characterized by including the steps of (1), setting initial values; (2), computing n and delta; (3), computing omega sr, omega ss, tss and tsr; (4), computing tz, judging whether tz> / =tsr or not, executing a step (5) if yes, and returning to the step (4) if not; (5), returning to the step (5) if it is cloudy, and executing a step (6) if it is not cloudy; (6), stopping the structure if a limit switch is touched, and executing a step (7) if the limit switch is not touched; (7), computing gamma s, adjusting alpha s and the gamma s, and executing a step (8); (8), comparing R2, R2', R2'' and R2''', judging whether R2= R2'= R2''= R2''' is true or not, if yes, keeping the alpha s and the gamma s and executing a step (13), and executing a step (9) if not; (9), judging whether R2 / = R2' / = R2'' / = R2''' is true or not, if yes, adjusting the alpha s and the gamma s sequentially and executing the step (13), and executing a step (10) if not; (10), judging whether R2= R2' / = R2''= R2''' is true or not, if yes, adjusting the alpha s and executing the step (13), and executing a step (11) if not; (11), judging whether R2= R2'' / = R2'= R2''' is true or not, if yes, adjusting the gamma s according to the S and executing the step (13), and executing a step (12) if not; (12), seeking Rmin, adjusting the alpha s and the gamma s sequentially and executing the step (13); (13) judging whether delta t is terminated or not, executing a step (14) if yes, and returning to the step (13) if not; (14), judging whether tz> / =tss or not, stopping the structure if yes, and executing the step (5) if not.

The invention relates to a land transportation systematized transportation proposal, and belongs to the technical field of railway transportation. The proposal cancels the obstruction of railway stations between railway transportation and highway transportation and makes trains continuously run for one to two years without stop, thereby saving energy, reducing consumption, relieving or eliminating pressure of traffic jam and floating population in large and medium-sized cities. Because of flexibility of a new system, the proposal can conveniently and quickly meet various development requirements of nation, politics, economy, military and culture; the trains starting from any point in a railway network can run all railways of the country to make the benefit surface of the railway transportation nationally; passengers get on or off and goods are loaded and unloaded at one time for terminal points; the trains can transport door to door to eliminate a great deal of waste due to transfer; the railway safety degree can be higher; the proposal can strengthen collection and distribution capacity of any point in the railway network, and provide powerful guarantee to strengthen national defense and consolidate frontiers; in order to decrease loss caused by reformation, new and old trains can run simultaneously in the early stage, and the railway stations, old carriages, and the like, are gradually eliminated through long time and all-directional benefit; and the defects of the prior railway transportation can be completely overcome.

The invention discloses a viewing shooting method and device, and belongs to the shooting field; the method comprises the following steps: receiving a viewing order under a shooting state, and forming a viewing box according to the viewing order, wherein the viewing box at least comprises partial the acquisition content; receiving touch control operation, adjusting boundaries of the viewing box according to the touch control operation so as to obtain the viewing content, wherein the touch control operation comprises touch control points and the sliding locus of the touch control points; receiving a shooting order, shooting the viewing content according to the shooting order, thus obtaining the viewing content. The method can adjust the boundaries of the viewing box in shooting, thus solving the problems that a user needs to shoot first and then adjust, so the whole process is complex, and storage space is occupied; the method can first adjust and then shoot, so the user can fast obtain the adjusted viewing content, thus reducing operation steps, reducing application program running number, saving battery electric quantity, and increasing the terminal equipment durance ability.

The invention relates to a spray pre-washing device for treating the smoke at the inlet of smoke desulfuration adsorption tower. Said invention is arranged inside the inlet smoke channel of adsorption tower and separated by spray main tubes into spray sub-tubes; the spray sub-tubes are distantly connected to the injectors; the spray main tube is arranged above the ascending smoke chamber of smoke inlet; the spray sub-tubes are vertical to the direction of smoke and inserted into the smoke channel from the upper part of smoke channel; the injectors are uniformly connected to two sides of spray sub-tubes. The invention has the advantages that: via smoke pre-washing inside the smoke channel, it can improve the desulfuration efficiency of completed adsorption tower; and it can reduce the temperature in the pre-washing process on the completed or built adsorption tower, to reduce the number of spray layer with lower load to reduce the energy consumption.

The invention provides an air conditioner, a control method and a control device thereof and a computer readable storage medium. The air conditioner comprises a plurality of external fans, a first temperature measuring member configured to detect an ambient temperature, a processor electrically connected to the first temperature measuring member and the plurality of external fans and a memory forstoring processor-executable instructions. When the processor is used for executing the executable instructions stored in the memory, the processor is configured to execute the following steps that heating of the air conditioner is controlled to start up; and the air conditioner is controlled to start with a first program or a second program according to the ambient temperature, wherein the firstprogram comprises the step of controlling the operation of the plurality of external fans, and the second program comprises the step of controlling at least one of the plurality of external fans to beclosed. According to the air conditioner, the problem that the internal pipe temperature or pressure is too high due to heating startup when the ambient temperature is high can be well avoided, the problems of starting failure or frequent starting caused by too high internal pipe temperature or pressure are solved, and the startup efficiency of the air conditioner is well considered.