84results about How to "Realize one-way transmission" patented technology

The invention discloses a broadband terahertz linear polarization wave asymmetric transmission device based on a metamaterial, and belongs to the field of transmission control devices of electromagnetic waves. The device comprises several basic units which are periodically arranged on an xy plane in the same direction, wherein each basic unit comprises five layers of structures which are arrangedsequentially, namely the dielectric layer 1, the metal layer 2, the dielectric layer 3, the metal layer 4 and the dielectric layer 5 from top to bottom in sequence, and the thickness of the dielectriclayer 3 is generally far larger than the that of the dielectric layer 1 and the dielectric layer 5; the metal layer 2 and the metal layer 4 are metal graphs which are constituted at the two sides ofthe dielectric layer 3 through technologies like photoetching or electron beam lithography; the graph constituted by the metal layer 4 is obtained by rotating the graph of the metal layer 2 by 90 degrees along the axis or through mirror symmetry. Dielectric film at the upper layer and the lower layer can be used for protecting the metal layers against abrasion and the stability of the device. Thebroadband terahertz linear polarization wave asymmetric transmission device is simple in structure and easy to prepare; one-way transmission of broadband terahertz linear polarization conversion is effectively achieved, and the device has an important significance in developing terahertz functional devices.

The invention provides a terahertz-wave asymmetric transmission apparatus based on an artificial electromagnetic material, which comprises a medium layer and double layers of artificial electromagnetic material layers. The medium layer is located between the double layers of artificial electromagnetic material layers; the medium layer is monocrystalline silicon or organic high-polymer medium material and the thickness of the medium layer is micron dimension; the double layers of artificial electromagnetic material layers are located on the surfaces of two side surfaces of the medium layer; the double layers of artificial electromagnetic material layers are composed of basic units of the artificial electromagnetic materials periodically arranged; and the thicknesses of the films are more than 200nm, and each basic unit of the artificial electromagnetic material is a linear, L-shaped or continuously U-shaped metal structure with a certain width. The terahertz-wave asymmetric transmission apparatus disclosed by the invention has strong linear polarization conversion dichroism; asymmetrical transmission of the terahertz linear polarization wave conversion is realized by a dual-layer chiral structure. a terahertz-wave isolator or a terahertz-wave diode can be realized, and the significance on development of a terahertz artificial electromagnetic material function apparatus is achieved.

The invention discloses an industrial communication isolation gap with a double-channel ferrying function. The industrial communication isolation gap comprises a safety end processing unit, a non-safety-end processing unit and a ferrying unit. The circuit of the safety end processing unit, that of the non-safety-end processing unit and that of the ferrying unit are all independent of one another and three units are communicated by USBs (Universal Serial Bus); the ferrying unit adopts a double-channel ferrying form; double channels are two independent one-way channels; one channel is a request channel, takes charge of carrying out one-way requesting from a non-safety end to a safety end and is used for configuration requesting and label requesting; the other channel is a data channel, takes charge of carrying out one-way transmission from the safety end to the non-safety end and is used for process data transmission and state data transmission. The isolation gap is used for an industrial control network and an upper layer information network to realize one-way transmission of process data under the condition of physical isolation, can perform functions of no maintenance of a tag and remote configuration, maintenance and management and brings great convenience to normal data acquisition and daily maintenance.

The invention provides a novel honeypot networking method and a honeypot system, and belongs to the technical field of network security. The invention provides a honeypot networking method, and the method comprises the following steps: listing idle services of a real business host, listing attacker common services, selecting some idle services from the idle services of the real business host according to the attacker common services, deploying the idle services as trapping nodes, deploying one trapping node for each selected idle service, and deploying one trapping node for each selected trapping node; binding the trapping node with the honeypot; when an attacker accesses an idle service, introducing attacker access flow into the honeypot, enabling the honeypot system to analyze the attacker access flow, automatically downloading a countering program and countering the attacker. According to the method, the trapping nodes are deployed on the idle service of the real service host, so that a large number of special servers or special virtual machines created on the idle servers are saved for deploying the trapping nodes, the capture efficiency is high, and the idle service is utilized.

The invention discloses a narrow-band optical filter and an all-optical diode. The narrow-band optical filter comprises first and second photonic crystal panels; the first and second photonic crystalpanels are one-dimensional photonic crystal which is composed by alternately placed silicon layers and silicon dioxide layers in uniform thickness; the first and second photonic crystal panels are adhered together to compose a one-dimensional photonic crystal heterojunction which meets an optical topological interface state excitation condition; the excitation of the optical topological interfacestate shows that sharp transmission peaks appears in a common band gap of the first and second photonic crystal panels, the transmission ratio of two lateral bands is still zero and a narrow-band filtering function is accordingly realized; the central wavelength of the transmission peak is the working wavelength of the optical filter, and the bandwidth is the working bandwidth of the optical filter. The all-optical diode comprises the filter and the plane grating, and the plane grating is adhered to one end of the photonic crystal heterojunction structure. The grating is used for controlling the excitation of the topological interface state based on the diffraction thereof for the light, and single-direction transmission of the light is accordingly realized.

The invention discloses electrothermal insulation and decoration integrated wall and floor tiles and a preparation method thereof. The method comprises the steps of sequentially distributing a tile matrix layer mixture (prepared from the following components: clay, quartz, feldspar and pigment), a non-metallic conductive layer mixture (prepared from the following components: a carbonaceous material, clay, an iron material and feldspar), and a foamed ceramic insulating layer mixture (prepared from the following components: solid wastes, feldspar, clay and a foaming agent); pressing into green bodies by using a press, drying the green bodies, and then firing the dried green bodies in a kiln at the high temperature. The wall and floor tiles have the advantages of being low in thermal loss energy consumption, having an electrothermal efficiency reaching up to 99%, and being convenient in construction, and can lower the construction and use costs to a certain extent.

This invention discloses one method and system to realize computer inside and outside network safe communication based on single machine communication computer, which prevents physical outside network to steal and damage inner net information by establishing single direction transmission wire between inner and outer net and outer computer and at same time establishes outer safety control computer for coding to realize inner net transmission safety management.

The invention belongs to the technical field of emulsifying machinery equipment and in particular relates to a polyurethane coating emulsifying device. The polyurethane coating emulsifying device comprises an emulsifying tank and further comprises a drive unit, a stirring unit and a telescopic unit, wherein the stirring unit is used for achieving a coating emulsifying effect; the drive unit is used for driving the stirring unit to stir; and the telescopic unit is used for realizing the motion of the stirring unit in the vertical direction. Through mutual match of a driving motor, an eccentricwheel, a rotating disc and the telescopic unit, the stirring disc can reciprocate in the vertical direction and can also rotate in the horizontal direction. On one hand, the contact area between the stirring disc and the coating is enlarged, so that the stirring efficiency of the coating by the stirring disc is improved, and the coating emulsifying efficiency is further improved; on the other hand, the coating is uniformly stirred by the stirring disc, so that the coating emulsifying effect is improved.

The invention discloses a unidirectional direct current voltage transformer which comprises a voltage source type current converter, an uncontrollable rectifier, and an inductor-capacitor voltage step-up loop circuit, wherein positive and negative electrodes of the voltage source type current converter are respectively connected with positive and negative electrodes of a low voltage direct current system; positive and negative electrodes of the uncontrollable rectifier are respectively connected with positive and negative electrodes of a high voltage direct current system; an alternating current side of the voltage source type current converter is connected with one end of an alternating current inductor, the other end of the alternating current inductor is connected with one end of an alternating current capacitor, the other end of the alternating current inductor is also connected with an alternating current side of the uncontrollable rectifier via an alternating current voltage transformer, and the other end of the alternating current capacitor is grounded. According to the converter in the invention, technologies of realizing two stage voltage step-up via the inductor-capacitor and the alternating current voltage transformer are adopted, the quantity of used power modules can be greatly reduced, and difficulty of controlling voltage sharing and current sharing among all power modules can be lowered.

The invention discloses a multi-channel high-density wavelength division multiplexing high-speed optical device. The optical device comprises a laser module, an optical path conversion module, a wavelength division multiplexing module, an optical fiber coupling module and an optical fiber which are sequentially arranged along the optical axis direction. The optical device is characterized in thatthe wavelength division multiplexing module comprises a first Z-Block module with four channels and a second Z-Block module with four channels; eight paths of divergent light emitted by the laser module are converted into eight paths of parallel light through the light path conversion module; and eight paths of parallel light are divided into two groups according to four paths as a group, one group of coupled light passes through a first Z-Block module and then is combined into one path, the other group of coupled light passes through a second Z-Block module and then is combined into a secondpath, and two paths of light from the first Z-Block module and the second Z-Block module pass through a wave combining module and then are combined into one path. The multi-channel high-density wavelength division multiplexing high-speed optical device can greatly shorten the optical path.

The invention discloses a mineral pigment grinding device for art pigment preparation. The mineral pigment grinding device comprises a vertical frame. A feeding hopper is connected to the center of the top of the vertical frame. A material blocking mechanism is arranged at the top of an inner cavity of the vertical frame. A transmission mechanism is arranged on the left side of the inner cavity ofthe vertical frame. A smashing mechanism is arranged in the middle of the inner cavity of the vertical frame. A grinding mechanism is connected to the right end of the smashing mechanism. A materialscreening mechanism is arranged below the grinding mechanism. A discharging mechanism is arranged below the material screening mechanism. The right end of the discharging mechanism extends out of thevertical frame. The mineral pigment grinding device is reasonable in structural design, an intermittent feeding function is achieved, the situation that the processing effect is affected due to the fact that excessive raw materials are fed at a time is avoided, the effect of smashing and refining pigment raw materials is achieved, follow-up grinding operation is facilitated, the grinding effect isfurther improved through evenly-distributed wear-resisting protruding blocks, the product quality of the pigment preparation is improved, pigment meeting the specification is effectively screened out, and qualified pigment can be conveniently conveyed out of the vertical frame.

The invention discloses an intranet and extranet isolated one-way secure data transmission structure and method. The structure comprises an intranet operation and maintenance data signal processing system, a one-way optical fiber multicast code stream transmission unit and a one-way ASI code stream transmission device. The method comprises the following steps: acquiring data of all equipment in abroadcast television broadcasting system, generating a TS file from the acquired data, and sending the TS file in a UDP multicast code stream mode or outputting the TS file in a TS code stream broadcasting and card issuing mode; transmitting the received multicast code stream in a one-way optical fiber multicast transmission mode; outputting ASI signals in a TS code stream broadcast card issuing mode, packaging the ASI signals into UDP multicast through one path, and providing the UDP multicast for an external network data receiving gateway and a database server; and directly providing the ASIsignals for television multiplexing equipment through the other path.

The invention belongs to the technical field of production of cosmetics and particularly relates to a production method of cosmetics. An emulsifying device adopted in the production method comprises an emulsifying tank, a driving unit, a stirring unit and a telescopic unit, wherein the stirring unit is used for emulsifying a coating; the driving unit is used for driving the stirring unit to stir;and the telescopic unit is used for realizing the movement of the stirring unit in the vertical direction. By virtue of the mutual cooperation among a driving motor, an eccentric wheel, a rotating disc and the telescopic unit, the stirring disc can do a reciprocating motion in the vertical direction and can rotate in the horizontal direction, on one hand, the contact area between the stirring discand the coating is increased, so that the emulsifying efficiency of the coating is improved; and on the other hand, the coating is uniformly stirred by the stirring disc, so that the emulsifying effect of the coating is improved.

The invention discloses a voltage protection circuit. The voltage protection circuit comprises a rectification circuit, a voltage signal acquisition circuit, a voltage follower, an optical coupler and a control module, wherein the rectification circuit is connected with an AC power supply, an input end of the voltage signal acquisition circuit is connected with the rectification circuit, an input end of the voltage follower is connected with the voltage signal acquisition circuit, a positive electrode of a light emitting diode in the optical coupler is connected with an output end of the voltage follower, a negative electrode of the light emitting diode is connected with an output negative electrode line of the rectification circuit, a collector of a photosensitive semiconductor in the optical coupler is connected with a power supply through a resistor, an emitter of the photosensitive semiconductor is connected with the ground, an input end of the control module is connected with the collector of the photosensitive semiconductor, an output end of the control module is connected with a control end of a controllable switch, the control module is used for controlling the controllable switch to be switched off when a DC voltage output from the rectification circuit is not within a preset range, and the controllable switch is arranged on an output positive electrode line between the AC power supply and a load, With the voltage protection circuit disclosed by the invention, electrical isolation between an input end of the voltage follower and an output end of a photoelectrical coupler is achieved, no influence of an output signal on the input end is generated, and the voltage protection circuit is high in anti-interference capability.

The invention discloses an Internet-of-Things security gateway with data aggregation and one-way transmission and an implementation method thereof, and the security gateway comprises: a security module which is used for extracting authentication information in message data uploaded by an Internet-of-Things terminal to carry out security access authentication; a data analysis and integration module which is used for carrying out data analysis on the message data uploaded by the Internet-of-Things terminal passing the security access authentication to obtain corresponding related communication parameters, and carrying out integration according to a set integration rule to form integrated data; a standard translation module which is used for carrying out compression coding on the integrated data according to a set standard to form a standard data packet, and packaging the standard data packet by using a special protocol; and a data one-way isolation transmission channel and a data management module which are respectively used for carrying out one-way transmission and subsequent operation on the packaged standard data packet. According to the invention, lightweight access authentication of the terminal, convergence and unification of data acquired by various types of transmitters and unidirectional transmission of data information in the gateway can be realized at the same time.

The invention discloses a novel microwave isolator. The novel microwave isolator comprises a waveguide; the two ends of the waveguide are provided with standard flange plates; and the upper side and the lower side of the waveguide are connected with super-interfaces. The novel microwave isolator can replace traditional microwave power protection and efficiency enhancement devices. The isolator notonly protects a microwave power supply but also improves the utilization rate of microwave energy. The problems that the traditional protection device is excessively small in power capacity and relatively low in efficiency, the traditional efficiency enhancement device is high in deployment difficulty and has a deployment blind area, and the like are solved. Compared with three pins, the non-reciprocal transmission isolator has the characteristics of no dynamic adjustment, simple system composition and the like. Compared with a circulator and a traditional isolator, the energy utilization rate is improved. The isolator can be processed by using a 3D printing method, is low in production cost, easy for large-scale production and processing, relatively low in temperature in a using processand relatively long in service life, and can meet the requirements of various fields on high-power microwave devices.

Disclosed is a visualized remote control feeder. The feeder mainly comprises a hopper, a stirring mechanism, a discharging mechanism, a water adding system, a gate, a weighing system, cameras, a control system, a driving mechanism and a walking mechanism. The stirring mechanism is arranged in the middle of the hopper, discharging outlets are formed in the two sides of the lower portion of the hopper, the discharging mechanism is arranged at the lower portion of the hopper, the gate is arranged between the stirring mechanism and the discharging mechanism, the walking mechanism is arranged at the lower portion of the machine frame, the driving mechanism provides power for the stirring mechanism, the discharging mechanism and the walking mechanism, the cameras are arranged at the front and back ends of a machine frame, the weighing system is arranged on a machine frame stand column, the weighing system, the cameras and the control system are electrically connected, and the control system comprises a wireless signal transceiving module. By reasonably adopting the feeder hopper, the previous stirrer-conveyor links are omitted, and corollary equipment is omitted, so that the occupied place is saved; unattended remote control is achieved through the weighing system, the cameras and the control system.

The invention discloses a laser optical shutter, and belongs to the technical field of communication. The system comprises a sending end and a receiving end, the sending end comprises a sending end circuit board and a light emitting module, and the receiving end comprises a receiving end circuit board and a light sensing module; the sending end circuit board comprises a sending end network transformation module, a sending end signal conversion module, a driving module and a laser which are sequentially connected, and the light emitting module and the laser are coaxially fixed; the receiving end circuit board comprises a detector, an amplification module, a receiving end signal conversion module and a receiving end network transformation module which are connected in sequence, and the photosensitive module and the detector are coaxially fixed. According to the invention, the requirements of physical isolation between networks and one-way non-feedback transmission of data can be met, and the system has good anti-magnetic interference and anti-interception capabilities.

The invention discloses a method and a system for realizing power network scheduling automation. In the method, a master station scheduling automation system transmits a request of remote control preset and remote signal deflection aiming at a controlled object to a substation automation system; the substation automation system drives the controlled object to perform the remote control preset and the remote signal deflection; simultaneously, the master station scheduling automation system transmits a video monitoring request aiming at the controlled object to a district-level master station; the district-level master station transmits the request to a station end system; and the station end system orders corresponding video monitoring equipment to perform video monitoring on the controlled object so as to realize the video monitoring of the controlled object when performing the remote control preset and the remote signal deflection. The method and the system realize the video monitoring when performing remote control operation and the remote signal deflection on the controlled object, greatly improve the safety of the power network scheduling automation, and has the characteristics that the method and the system are safe and convenient to operate along with low investment cost and high flexibility.

The invention discloses lighting equipment, a bidirectional wireless charging device and a bidirectional wireless charging control method. The device comprises a first switch unit, a second switch unit and a control unit, wherein the first switch unit is connected with the control unit, the first end of the first switch unit is connected with a direct-current power supply through an inversion unit, and the second end of the first switch unit is connected with a transmitting coil; the second switch unit is connected with the control unit, the first end is connected with the direct-current powersupply through a rectifying unit, and the second end is connected with a receiving coil; the control unit is used for receiving a discharging mode selection signal output by a switching unit, controlling the first switch unit to be switched on, controlling the second switch unit to be switched off and controlling the inversion unit to work, and the transmitting coil converts electric energy intomagnetic energy and outputs the magnetic energy to the outside; and the control unit is also used for receiving the charging mode selection signal output by the switching unit, controlling the first switch unit to be switched off, controlling the second switch unit to be switched on, controlling the rectifying unit to work and charging the direct-current power supply. The embodiment of the invention can realize bidirectional charging and discharging, and is simple in structure and convenient and efficient to use.

The invention discloses a two-stage transmission middle motor of a moped, and relates to the field of motors. An existing middle motor is generally of a parallel expansion type structure, and engagement and disengagement efficiency, the transmission effect and moment all have room for improvement. The two-stage transmission middle motor comprises a shell, a motor assembly, a transmission assembly,a centre shaft, a controller, a one-way clutch, a moment sensor and an auxiliary power output disc. The transmission assembly is a two-stage gear reduction system. A first-stage transmission large gear of the transmission assembly is engaged with a transmission gear of a rotor shaft, the first-stage transmission large gear is fixed to an axle of a second-stage transmission small gear, and the second-stage transmission small gear is engaged with a driven large gear. The driven large gear cooperates with a shaft ring of the one-way clutch. The one-way clutch, the deformation generating part ofthe moment sensor and the centre shaft are sequentially in engaged connection through gears. The moment sensor is electrically connected with the controller. The overall structure is simple, inductionis sensitive, the power output effect is good, the engagement and disengagement efficiency is high, and the assistance effect is effectively improved.

The invention provides a plastic uptake light-weight automobile ceiling interior trimming panel and a using method thereof, and belongs to the technical field of automobile parts. The structure comprises a ceiling plate, wherein the two sides of the ceiling plate are fixedly connected with a C frame clamping shell, a B frame clamping shell and an A frame clamping shell; a containing groove which is formed in the top of the ceiling plate, and sunshade cloth is arranged in the containing groove; a water diversion plate which is fixedly connected to the top of the ceiling plate and corresponds to the containing groove, wherein a sealing ring is fixedly connected to the top of the water diversion plate, so that the sunshade cloth is unfolded, the containing groove is sealed by the sunshade cloth through unfolding of the sunshade cloth, a sealed space is formed by the top of the ceiling plate and the automobile ceiling; therefore, air circulation is isolated, and the automobile roof is subjected to heat insulation; when the automobile skylight is opened, an air flow channel flowing out from the edge of the automobile roof skylight to the C frame clamping shell, the B frame clamping shell and the A frame clamping shell is formed. In this way, the case in the automobile is cooled, and the temperature in the automobile is effectively reduced.

The invention, which relates to the technical field of diodes, in particular to an all-optical diode structure based on a nonlinear microcavity coupling system. A nonlinear Bragg microcavity is platedwith a metal film; and a coupling system is formed based on the mutual effect of a metal plasmon polarization effect and a Bragg microcavity mode, so that the high-transmissivity microcavity modes and bistable states can be generated. Because of coupling of the surface plasmon generated by a single-layer metal film and a microcavity mode, the electromagnetic field distribution inside the structure is changed and thus the field distribution depends on the incident direction of the light wave, so that the unidirectional transmission of light is realized. The transmissivity and the extinction ratio are both considered by the designed structure; and the forward transmission rate and the extinction ratio can be modulated accurately by changing the metal thickness.

The invention relates to a bicycle expansion brake hub assembly, which comprises a hub and a centre shaft, wherein the hub is composed of a rim and a disk chuck, and one end of the hub is provided with a brake component. The brake component is composed of an expansion block, a roller skeleton, an inner baffle plate, an outer cover plate, return springs, a torsion spring and brake tiles, and the brake tiles are uniformly distributed around the inner wall of the shell of the disk chuck. A notch slot is arranged in the roller skeleton, and rollers are arranged in the notch slot. The inner baffle plate and the outer cover plate are respectively sheathed on flat heads of two sides of a plummer block. The expansion block is hexagonal and is embedded in the inner cavity of the roller skeleton, and the outer side of the expansion block is fixedly connected with an end plate. A brake wrench is arranged on the end plate, and the outer cover plate is arranged at the outer side of the expansion block. The torsion spring is arranged between the end plate and the outer cover plate on the outer side of the expansion block, and each return spring is hooped in an arc-shaped groove of the excircle of each brake tile. The bicycle expansion brake hub assembly has the advantages of compact structure, firm and reliable whole, compression and vibration resistance, large bearing capacity and good brake performance, is not easily damaged, is durable in use, and can be used as a front hub or a rear hub.

The invention discloses an information display and reading method and device, and the method comprises the steps that a first single-chip microcomputer receives a verification code through a network,wherein the verification code is displayed in a first display screen; a second camera of a second single-chip microcomputer reads the verification code in the first display screen, encryption operation is conducted on the verification code through a formula, a ciphertext is generated, and the ciphertext is displayed in a second display screen of the second single-chip microcomputer; a first cameraof the first single-chip microcomputer reads the ciphertext in the second display screen and sends the ciphertext to a website server through a network for decryption and verification; and after theciphertext is received, the website server carries out decryption operation on the ciphertext. The characteristic of cameras and display screens read each other is utilized, one-way transmission of information is achieved, a second single-chip microcomputer can achieve stand-alone operation, and the network communication function is achieved through the first single-chip microcomputer.

The invention discloses a stream media multicast structure and a data stream transmitting and receiving method thereof. A C / S mode is used, a steam media transmitting source is used as a server end, stream media receiving equipment is used as a client, multicast data packets can cross various different network segments in large, medium and small local area networks under the support and configuration of an IGMP protocol without a switcher or a router, and stream media IP multicast technology application is achieved. The stream media multicast structure and the data stream transmitting and receiving method thereof have the advantages that on-way transmission of multicast service streams is achieved under a cross-network-segment environment without modifying router configuration and a multicast router protocol, and the method is quite suitable for being implemented in audio-video multicast service stream on-way push application systems.

The invention discloses a data isolation transmission system and method, and relates to the technical field of information security. The system comprises a control terminal, an inner terminal controller, an inner data dock, an outer data dock, an outgoing terminal, a relay and an electronic disc, wherein the electronic disc is connected with an inner network or an outer network through the replay arranged between the inner network and the outer network; further the unidirectional transmission of data from the inner network to the outer network is realized by using the electronic disc as a medium. The system can realize data automatic transmission through logic control, does not need manual intervention, is low in cost and high in efficiency, is not required to be connected through a reticle or other types of connecting lines, avoids the problem of outer network intrusion caused by connecting lines, and guarantees the security of inner network information, thereby meeting the security of inner network information of industries, such as governments, armies and energy.

The invention discloses a mid-infrared pulsed laser device, which comprises a THETA resonant cavity. By the structural design of constructing a circular cavity, irreversible loss is introduced in inverse S-shaped feedback so as to realize one-way laser transmission in the cavity and achieve high-power 3-micron-waveband laser output; and 3-micron-waveband laser output of long / short / ultra-short pulses is achieved by introducing fluoride micro-nano fiber passive modulation devices of different parameters in a main ring.

The invention discloses a link protection system and method based on dynamic planning, and relates to the field of information security. The system comprises a link management and control center (100), a transit link server cluster (200), a user terminal (300) and a target server (400); the link management and control center (100) interacts with the transit link server cluster (200), and the transit link server cluster (200) separately interacts with the user terminal (300) and the target server (400). The method comprises the following steps: (1) dynamic planning method; and (2) data forwarding method. The link protection system and method provided by the invention have the following advantages and positive effects: (1) the timeliness is strong; (2) the dynamic planning path algorithm is simple and efficient; (3) the system safety is high; (4) the system is extensible; and (5) the IP tracing is prevented.

The invention discloses a device for unidirectional file transmission among different networks. The device comprises a transmitting device and a receiving device, wherein the transmitting device is accessed to an information source network, and the receiving device is accessed to an information sink network. The device is characterized in that: the transmitting device and the receiving device are connected through a plurality of Ethernet straight-through cables which only support unidirectional data transmission physically; the transmitting device transmits a file to be transmitted to the receiving device through the Ethernet straight-through cables; and the receiving device receives and processes information transmitted through the Ethernet straight-through cables. The invention further discloses a unidirectional file transmission device which adopts a traffic limiting method to prevent data loss caused by unconfirmed transmission methods. The invention further discloses a unidirectional file transmission device which adopts special confirmation hardware for transmitting confirmation information.