64results about How to "Do not change operating habits" patented technology

A safe outward delivery method for electronic document is provided, which installs a platform for outward delivery environment in computer. The outward delivery end comprises a client material registration module that registers the materials of a receiving client of the outward delivery and applies the materials for outward delivery request, a outward delivery request module that uploads the documents need to be sent, explains the protection policies and records the request process, an outward delivery approval module that searches the outward delivery request at regular time, makes router strategy according to the workflow and starts the entrustment if no router is available, an outward delivery make module that automatically makes the approved document into outward delivery document. Wherein, a receiving end comprises an outward delivery receiving module that recognizes the outward delivery document, the sender needs to preset the document under protection of outward delivery as confidential document; upon receiving the outward delivery request, the sender will start the workflow according to the strategy for the approval of outward delivery; the receiver installs receiving tools according to the strategies; the installation strategy comprises code-based installation and machine-based installation.

The invention discloses a cloud security management system and a method applying the system. The system is based on a PKI (Public Key Infrastructure) encryption system and is provided with a transmitting end, a receiving end and a could security service end, wherein the transmitting end is used for helping a sender to send security documents, the receiving end helps a user to receive, read and operate the security documents, and the cloud security service end is used for controlling and managing all documents in the system. According to the system and the method, the whole life cycles of the sent electronic documents are subjected to dynamic management, and various safety strategies are provided as follows: dynamic limits of authority control, operation statistics, out-of-limit recovery, moving track support, a cloud security-based work environment for sending the electronic documents containing sensitive information is constructed, and the applicable range is wide. According to the method, the operation habit of the user cannot be changed, and the cost performance is high.

The invention relates to a remote multi-keyboard mouse control method for a network computer, which is characterized in that a server-side starts a service object and waits to be connected with a client-side; the client-side registers hot keys for connecting / disconnecting the server-side and inspects actions of the keyboard and mouse of a local computer; the client-side runs by the hot keys in a local mode or a remote mode; after the client-side is connected with the server-side, the events that the keyboard of the local computer is pressed down or lifted, the mouse is moved, and the keys are clicked or lifted are sent to the server-side by a network; after the server-side receives a connection request from the client-side, a mouse pointer icon is drawn with a specified color on a screen; the server-side receives keyboard and mouse instructions sent from the client-side, input / output (I / O) equipment at a simulation server side sends the instructions to an operating system, and the operating system executes corresponding actions; and the server-side returns real-time screen contents to the client-side which displays the real-time screen contents. The method has the advantages of low cost, shorter development period and stable function.

The invention discloses a method for file transparent encryption and decryption of the Android platform. The method includes the steps: selecting a route of a folder where a file needed to be protected is positioned, and setting passwords; respectively generating an encrypted route dictionary list and an authentication file according to the route and the passwords input by a user; scanning the encrypted route dictionary list, if an operating system is started for the first time, subjecting the protected file to first-time initialization encryption according to list items, and then carrying out the next step; when the user triggers a screen unlocking event, receiving a passphrase input by the user, comparing the passphrase subjected to hash algorithm with the authentication file generated at the step two, and if the passphrase is not matched with the authentication file, judging that unlocking fails; if the passphrase is matched with the authentication file, subjecting the passphrase to sha 1 algorithm to generate a secret key, and storing the secret key; calling the secret key for encryption and decryption of the file. The invention further discloses a system for file transparent encryption and decryption of the Android platform. File protection is realized on the premise of small interferences to user operations.

The invention relates to a device for emergently and safely braking an accelerator of a motor vehicle. The device is characterized by comprising an accelerator operating rod, an accelerator pedal safety valve, a pressure sensor and an electromagnetic brake; the accelerator pedal safety valve is a columnar cylinder body filled with liquid; a piston and a piston rod can move between two ends of the cylinder body; liquid medium can flow via a through hole in the piston; one end of the through hole is provided with a corresponding valve plate; the piston rod is movably connected with the accelerator operating rod; a baroreceptor is arranged in the accelerator pedal safety valve and when a driver steps the accelerator by mistake in an emergency, the valve can close the through hole in the piston automatically and instantaneously so as to support and fix the accelerator operating rod tightly; and simultaneously the pressure change of the liquid excites an automatic braking system by the baroreceptor so as to achieve the purpose of emergency brake.

The invention discloses a password protection method applied to a plaintext protocol proxy in an operation and maintenance auditing system. The login end of an operation and maintenance device initiates identity authentication of an operation and maintenance auditting system user to the service end of the operation and maintenance device through an SSH encryption protocol, and establishes an SSH encryption channel; the service end of the operation and maintenance device generates a one-time password and returns the password to the login end of the operation and maintenance device; and the login end of the operation and maintenance device calls a plaintext protocol client, logs in the operation and maintenance auditing system with the one-time password, and then logs in to a plaintext protocol server from the operation and maintenance auditing system. The invention transmits user identity information through the SSH encryption channel, and the encryption feature of the SSH encryption protocol ensures that the user identity information is not leaked; the plaintext protocol client and the plaintext protocol server are logged in by using the one-time password; although the plaintext protocol does not perform data encryption, the purpose of protecting the plaintext protocol from being disclosed is achieved as well; passwords generated automatically are different each time, and the password is invalid when used, so that the phenomenon of randomly logging in the plaintext protocol server with an old password or a stolen password is avoided.

The invention provides a file protection system and an implement method thereof. The file protection system structurally comprises an upper layer user interface application program, an I / O manager, a file filter driver and independent encryption hardware, wherein the upper layer user interface application program is configured to realize encryption policy setting and other man-machine interaction; the I / O manager is configured to receive request information from the upper layer user interface application program and to distribute data in a request packet form; the file filter driver is configured to intercept request packets from the I / O manager, judge the data in the request packets and transmit eligible to-be-processed data; and an encryption / decryption algorithm and a secret key are stored in the independent encryption hardware and act on the file filter driver, and the independent encryption hardware is configured to receive and process the to-be-processed data from the file filter driver. According to the file protection system and the implement method thereof, the encryption and decryption processes are both completed in the independent encryption hardware, the secret key cannot come out of the encryption hardware in the whole encryption / decryption process, and the safety of files is improved.

The system includes following devices: intelligent terminals setup at counters of each bank network site; site server setup at each bank network site; central server setup at central computer room of bank. Through LAN of bank, each intelligent terminal is connected to site server at bank network site. Through WAN, site server at bank network site is connected to central server at central computer room of bank. The method reserves image of ID card depositor keeps back automatically, and compares ID card for drawing money from bank to image of ID card reserved in order to make sure that ID card for drawing money from bank is identical to ID card for depositing money to bank. The invention solves issue difficult to identify valid id at terminal device at bank. Advantages are: automatic examining ID card, easy of operation, no need of changing current bank saving system, compatible to multiple types id cards.

The invention discloses a disposable safe syringe capable of automatically retract with replaceable needles, and relates to the technical field of medical apparatus. The syringe comprises a needle cylinder (1), a push rod (2), a dispensing needle (3) and an injection needle (4), wherein the dispensing needle (3) or the injection needle (4) can be replaced according to the using requirement so as not to have negative effect on human body injection due to the deformation of the needle and influence on glossiness and sharpness caused by medicament dissolution. During use, the conventional operation habit is basically unchanged, the syringe is convenient to use and has reliable action, the injection needle can still retract and hide trough an automatic retraction mechanism after injection is finished so as to ensure that doctors and patients are prevented from accidentally hurt by a stained needle; and the used syringe cannot be used repeatedly for the injection, so the disposable syringe is realized in the real sense and hematogenous diseases are prevented from spreading. The syringe is particularly suitable for automatic assembly production in a production line due to reasonable structural design and has high quality and qualification rate.

The invention discloses a logic electric pneumatic breaking system for a heavy load train and a control method thereof. The logic electric pneumatic breaking system for the heavy load train comprises a locomotive unit, a vehicle unit and a train tail device, wherein the locomotive unit comprises a locomotive power supply, an electric pneumatic controller and a locomotive pneumatic brake machine; and the vehicle unit comprises a vehicle power supply, an electrical control unit and a vehicle pneumatic brake machine. In the invention, a braking system of a large long heavy duty train is controlled by a logic encoded signal, the operating signal of the locomotive pneumatic brake machine is converted into a logic electrical signal to be sent to the vehicle units by the electric pneumatic controller of the locomotive unit, the synchronous braking and relieving of all train braking systems are achieved to reduce the longitudinal impulse force and the free running time of the large long heavy duty drain in braking and relieving; other electrical signals and the air wave signal are parallel; the structures and the operation habits of the conventional automatic pneumatic brake machines of the locomotive and the vehicle are not changed, and the conventional automatic pneumatic brake machine is compatible with the logic electric pneumatic breaking system.

The invention relates to a differential hydraulic cylinder control loop. The differential hydraulic cylinder control loop mainly consists of a differential hydraulic cylinder, a direction control valve, a one-way valve, a variable throttle valve, a flow regeneration valve and a differential connecting control valve, wherein the differential connecting control valve and the one-way valve are formed to a differential connecting control branch; and the variable throttle valve, the flow regeneration valve and the one-way valve are formed to a flow regeneration control branch. The differential hydraulic cylinder control loop integrates the hydraulic cylinder differential control loop with the flow regeneration loop, and is more comprehensive in functions; when the hydraulic cylinder performs a pressed extension motion, the loop achieves an effect of the differential control loop, so that the extension speed of the hydraulic cylinder can be accelerated, and the working efficiency is improved; and when the hydraulic cylinder performs a pressed shrinkage motion, the loop achieves an effect of the flow regeneration loop, so that high hydraulic pressure in a rodless cavity of the differential cylinder can be reused to achieve the purposes of energy conservation and emission reduction.

The invention discloses a book keyword search-oriented user theme privacy protection method and system. The method comprises the following steps: (1) obtaining a current user query and a user history query sequence to synthesize a user query sequence; (2) constructing a pseudo book query sequence for the user query sequence, so that the pseudo book query sequence is accurate in query result, privacy-safe and highest in query efficiency; and (3) executing the pseudo query sequence to obtain an intermediate book record set, executing current user query on the intermediate book record set by the trusted end, and obtaining a result book record set and returning the result book record set to the user. The system runs on a trusted client, and is signally connected to a client running on a user interface and an untrusted server, and further comprises a user query acquisition module, a pseudo query construction module and a result screening module. According to the method, the user query sequence is modified carefully, the real book query theme of the user is blurred on the premise that the query accuracy is not damaged, and the privacy security of the user theme is effectively protected.

A high-speed hydraulic punching machine comprises a machine bed and a sliding block and is characterized in that one end of an electronic ruler is fixed to the machine bed, the other end of the electronic ruler is connected to the sliding block, the sliding block is connected to a piston of a hydraulic cylinder and drives the piston to move downwards under the gravity effect, oil is directly sucked into a working chamber from an oil tank through the gravity, when the sliding block moves downwards to the set position, the electronic ruler drives a control system to enable double oil pumps to fast supply oil to the working chamber of the hydraulic cylinder simultaneously for driving the piston to drive the sliding block to fast move downwards for realizing high-speed punching, when the sliding block moves downwards to the lower limit position, the electronic ruler drives the control system again to enable one oil pump to stop supplying the oil, and the other oil pump and an energy accumulator fast supply oil to an oil return chamber of the hydraulic cylinder for enabling the piston to fast return to another cycle. The high-speed hydraulic punching machine has the advantages of being stable, safe, mute, friendly to environment, practical, wide in application range, easy and convenient to operate, easy to control and compact in structure, saving the energy and reducing emission, and work-pieces are attractive.

A misoperation safety protection device for an automotive accelerator pedal is added on an automobile and is used for preventing a safety accident caused by a misoperation to the accelerator pedal which is mistakenly used as a brake pedal. The misoperation safety protection device comprises the components of an accelerator pedal speed sensor, an automatic braking device and an electric control device. The misoperation safety protection device is characterized in that the accelerator pedal speed sensor is a mechanical-photoelectric sensor; the automatic braking device comprises a braking spring, a control electromagnet, a pawl, a braking lever and a braking connecting rod. The pedal speed sensor comprises a rotary photoelectric encoder. One end of the braking lever is provided with a reset pedal 241. A hinge for hinging the braking connecting rod with the brake pedal is an open hinge. The misoperation safety protection device has advantages of simple structure, simple mounting, no effect on an original automobile structure, no cab space occupation, no effect on normal operation, no requirement for operation habit change of an operator, high response speed, high reliability, effective capability of restoring normal driving through one-foot resetting, easy popularization, relatively high practical value and relatively high social benefit.

The invention discloses a novel gastrointestinal endoscope system. A suction port of a gastrointestinal endoscope is connected with a suction tube of a negative pressure device, a first electronic flow choke is mounted on a pumping tube, an operating handle of the gastrointestinal endoscope is provided with an electronic suction button and an electronic water-air button, the first electronic flow choke is controlled via the electronic suction button, suction is started after the electronic suction button is pressed and is stopped after the electronic suction button is released, air is delivered into a body through an air delivery tube of a water-air management center and a pipeline in the gastrointestinal endoscope after the electronic water-air button is slightly pressed, and water is supplied to flush a lens through a water delivery tube of the water-air management center and the pipeline in the gastrointestinal endoscope after the electronic water-air button is heavily pressed. The electronic suction button and the electronic water-air button are non-contact electronic buttons, requiring no independent cleaning and sterilizing; a suction line, a water delivery line and an air delivery line are complete with no dead cavities, and cleaning and sterilizing are easier; the novel gastrointestinal endoscope system integrating perfusion and suction is free of blocking, and working efficiency and working quality can be effectively improved.

The invention discloses a novel locomotive safe accelerator which belongs to a locomotive safe device and includes an accelerator pedal as well as an operation rod and a toggle mechanism connected with the accelerator pedal. The novel locomotive safe accelerator is characterized in that the other end of the operation rod is provided with a sector wheel mechanism; the sector wheel mechanism is connected with a ratchet wheel mechanism; the ratchet wheel mechanism is connected with the toggle mechanism; a braking mechanism is arranged below the operation rod. Compared with the prior art, the novel locomotive safe accelerator has simple structure, is convenient to be operated, is safe and reliable and can effectively avoid a traffic accident from happening.

The invention discloses a built-in integrated water connector reversing mechanism for a single-power synchronous two-way mixing pile machine. The built-in integrated water connector reversing mechanism comprises a reversing mechanism body and a water connector. The water connector and the reversing mechanism body are integrally formed. The water connector is horizontally located in a transmission shaft of the reversing mechanism body. An expansion cavity is formed in an inner cavity in the top of the transmission shaft of the reversing mechanism body, the bottom end of a conveying shaft of the water connector is inserted below the bottom of the expansion cavity of the transmission shaft, and the outer wall of the upper portion of the portion, in the expansion cavity, of the conveying shaft is sleeved with a pair of bearings. Bearing seats located outside the bearings are fixed into the expansion cavity, the conveying shaft is fixed to the inner rings of the bearings through nuts, filler having the sealing effect is arranged at the bottom of the expansion cavity and located on the outer side of the conveying shaft, and a pressing flange is arranged at the top of the filler. The built-in integrated water connector reversing mechanism achieves the reversing function and the slurry conveying function, and is small in size, low in weight, novel in mechanism, simple, low in manufacturing cost and convenient to install; and an inner through hole is large, various curing materials of cement slurry, cement mortar, cement-soil slurry and concrete can be conveyed, and the range of the curing materials for mixing piles is expanded.

The invention discloses a turning light-splitting unit, and an endoscope optical imaging system and imaging method. The turning light-splitting unit is used for enabling the positions of imaging focal planes of light with different wavelengths to be consistent. The imaging system comprises a light signal transmitting unit, a light signal collection unit, and a camera unit. The light signal transmitting unit transmits visible light and near infrared exciting light to a to-be-detected tissue. The light signal collection unit collects the visible light reflected by the to-be-detected tissue and the near infrared fluorescence emitted by excitation. The camera unit receives two types of light collected by the light signal collection unit, and enables the positions of imaging focal planes of two types of light to be consistent. The imaging method comprises the steps: transmitting visible light and near infrared exciting light to the to-be-detected tissue; collecting the visible light reflected by the to-be-detected tissue and the near infrared fluorescence emitted by excitation; splitting two types of light, converging the two types of light, and enabling the positions of imaging focal planes of two types of light to be consistent. The system is simple in structure, is small in size, and is low in manufacture cost. The system can output color and fluorescence images at the same time, and is low in requirements for the operation capability of software.

The invention discloses a private key storage and mnemonic method of an encrypted digital currency wallet based on a digital watermark technology, which comprises the following steps of: installing adigital watermark embedding and extracting module on client digital currency wallet software of an encrypted digital currency network, and matching with an existing blockchain system to operate by virtue of a computer network. The invention has the outstanding advantages that: the structure is simple; the method is different from a management mode of 12-24 mnemonic words of a private key in existing popular encrypted digital currency wallet software. According to the invention, a 6-bit digital mnemonic symbol is adopted; a digital watermarking technology with better hiding performance is innovatively combined; the corresponding private key is used as digital watermark recognition information; according to the method, the encrypted digital currency is embedded into the image file specifiedin the digital currency wallet software, so that the difficulty of discovering and cracking the private key is greatly improved, the memory burden of a user is effectively reduced, the safety and reliability of encrypted digital currency network transaction are ensured, and the existing bank account operation habit is not changed.

The present invention is guy cable technology of breaking air throttle in case of stepping on the accelerator accidentally. There are one casing with bore possessing smaller left end, one slide block with lock tongue in the right end inside the smaller left end, air throttle guy cable hinged to the left end of the slide block, one pull rod inserted inside the large end of the casing, one claw bar with right end hinged to the pull rod, one claw block hinged to the left end oft claw bar and embedded to the lock tongue. There are at least two sets of claw bar and the claw block, and the pull rod has the right end hinged to the accelerator pedal. In case of stepping on the accelerator accidentally, the air throttle will be closed fast to brake so as to avoid accident.

The invention discloses a safety password authentication method which can be used in user password authentication of a C / S or B / S mode. According to the password authentication method, single-character input and multiple Hash modes are adopted. Meanwhile, by combining validate codes and a local prospective validation mechanism, authentication safety is greatly guaranteed, and present user experience is not changed for users.

The invention relates the field of medical instrument, and relates to a full automatic electric induced abortion suction unit, in particular to a full automatic electric induced abortion suction unit used in a pregnancy termination operation. The full automatic electric induced abortion suction unit comprises a collection container and a negative pressure pump. The collection container is connected with a first air pipe, the collection container is connected with an electromagnetic valve through a second air pipe, the electromagnetic valve is connected with an air storage tank through a third air pipe, and the air storage tank is connected with the negative pressure pump through a fourth air pipe. The suction unit further comprises an automatic control system. The automatic control system comprises a keyboard control system and an analog-digital conversion control system. An output terminal of the keyboard control system is connected with the analog-digital conversion control system. The analog-digital conversion control system comprises a first negative pressure sensor and a second negative pressure sensor. The first negative pressure sensor is connected with the air storage tank through a fifth air pipe and connected with the negative pressure pump. The second negative pressure sensor is connected with the collection container through a sixth air pipe and connected with the electromagnetic valve. The pressure of the full automatic electric induced abortion suction unit is not too large or too small.

The invention discloses a logic electric pneumatic breaking system for a heavy load train and a control method thereof. The logic electric pneumatic breaking system for the heavy load train comprises a locomotive unit, a vehicle unit and a train tail device, wherein the locomotive unit comprises a locomotive power supply, an electric pneumatic controller and a locomotive pneumatic brake machine; and the vehicle unit comprises a vehicle power supply, an electrical control unit and a vehicle pneumatic brake machine. In the invention, a braking system of a large long heavy duty train is controlled by a logic encoded signal, the operating signal of the locomotive pneumatic brake machine is converted into a logic electrical signal to be sent to the vehicle units by the electric pneumatic controller of the locomotive unit, the synchronous braking and relieving of all train braking systems are achieved to reduce the longitudinal impulse force and the free running time of the large long heavy duty drain in braking and relieving; other electrical signals and the air wave signal are parallel; the structures and the operation habits of the conventional automatic pneumatic brake machines of the locomotive and the vehicle are not changed, and the conventional automatic pneumatic brake machine is compatible with the logic electric pneumatic breaking system.

The invention provides a strong and weak suction integrated double-cavity saliva suction tube. The saliva suction tube comprises a tube body and a sucker, wherein the sucker is fixed at one end of thetube body, a metal wire is embedded in the wall of the tube, a partition plate is vertically arranged at the middle part in the tube body, the inner cavity of the tube body is divided into a first cavity and a second cavity by the partition plate, the side wall of the first cavity close to the sucker is provided with an opening communicated with the cavity, and the opening is provided with a capfixed on the tube body. By using the strong and weak suction integrated double-cavity saliva suction tube, a doctor can also use strong suction during treatment alone, thereby reducing the personnel allocation; the operation is simple, the operation mode is not changed on the original basis, and the operation habits of doctors do not need to be changed, thereby saving the adaptive processes of thedoctors; and weak suction and strong suction are performed simultaneously, thereby reducing the pollution of aerosol and making the operation environment safer.

The invention discloses a safe injector. The safe injector comprises a syringe with a rubber plug, a push rod, a needle tube and a needle holder, wherein a retraction part is spliced on the needle holder; the needle tube is fixed at one end of the retraction part, and a conical head is arranged at the other end of the retraction part; a slot is formed between the conical head and the retraction part; a mounting groove part is arranged at one end of the syringe; a clamping part is arranged at the bottom of a solution cavity; and when the push rod moves to the bottom of the solution cavity, the clamping part is pressed by an unlocking boss, so that a clamping block is separated from the slot, and the conical head is fixed in a locking groove. The safe injector is convenient and reliable to use without changing the traditional operation habit, and the needle tube can be retracted into the solution cavity of the syringe when injection is completed, so that medical staff can be protected from accidental injury by a polluted needle tip and can be prevented from affecting diseases due to needle tip injury.

The invention discloses a night search lighting indicator light control system for an airport. The night search lighting indicator light control system comprises a control tower control terminal and a light vehicle receiving terminal which are in wireless connection, wherein the control tower control terminal comprises a control tower antenna, a control tower wireless receiving and transmitting unit, a double-audio coding unit and a control unit. The control unit comprises a control module, three control switches and three indicator lights, and the three control switches and the three indicator lights are connected with the control module. The control module is connected with the control tower wireless receiving and transmitting unit and the double-audio coding unit. The output end of the double-audio coding unit is connected with the control tower wireless receiving and transmitting unit which is connected with the control tower antenna. The light vehicle receiving terminal comprises a light vehicle antenna, a light vehicle wireless receiving and transmitting unit, a double-audio decoding unit, a relay control unit, a display unit and a light vehicle control unit, wherein the light vehicle antenna and all the units in the light vehicle receiving terminal are sequentially connected, and the display unit and the light vehicle control unit are connected with the relay control unit. The night search lighting indicator light control system is high in transmission speed, powerful in function, and low in cost. The circuit is reliable and simple, the voice communication function is achieved, and original operation habits are not changed, so that the night search lighting indicator light control system is beneficially popularized and utilized.

The invention discloses a key protection method and system in an Android environment, which realizes file protection through key transparent encryption and decryption operations on the Android platform, including generating an encryption path directory table and an identity verification file respectively; scanning the encryption path directory table, and performing Initialize encryption for the first time; when the user triggers an unlock screen event, perform a hash algorithm operation on the passphrase used to lock the screen and compare it with the authentication file; convert the passphrase into a key using the Shal algorithm and store it; when the user Send a write request, call the key to encrypt the file; when the user sends a read request, call the key to decrypt the file; when the user triggers the lock screen event, clear the key and lock the screen. The present invention adopts the combined lock interface to reduce the impact on user operations as much as possible, and realizes key protection for system files that are blocked externally and unobstructed internally.

The invention provides a power saving method of a mobile apparatus and a communication system thereof. The method and the system are suitable for the mobile apparatus under an embarkation vehicle environment. The mobile apparatus establishes connection with a communication apparatus through a first communication protocol. A base station establishes connection with the communication apparatus through a second communication protocol. Transmission power needed by using the first communication protocol is lower than the transmission power needed by using the second communication protocol. If the connection between the mobile apparatus and the base station through using the second communication protocol exists, the connection is cut off. An operation interface of the mobile apparatus is provided for a user to operate so that the mobile apparatus can communicate with the base station through the communication apparatus.

Present invention discloses an sound code Chinese characters input method and keyboard for reducing key pressing times in using complete spelling input method to raise input speed. Said invention includes complete spelling input method and 26 letter key having same letter key sequence with normal keyboard, wherein the '-ng' in Chinese spelling is inputted one time by V key, said key setting with '-ng' input circuit and also having 'u' and '-ng' input function. Said invention has distinctness effect, in inputting 411 Chinese characters syllable in 'Xinhua Dictionary' can reduces key pressing by 81 times, the maximal code long is reduced from 6 to 5, mean code length is reduced from 3.21 to 3.02, and has simple keyboard structure and easy manufacture.