62results about How to "Realize crossing" patented technology

The invention discloses a method of GRE tunnel traversing network address conversion equipment and network address conversion equipment applied in private network and public network separated by the network address conversion equipment; the private network comprises a plurality of private network devices; the public network comprises a public network device; the network address conversion equipment is connected with the public network device through the unique public network address. In the invention, the GRE marks carried in GRE message received by the network address conversion equipment causes the network address conversion equipment can differentiate the different data from the private network side according to the GRE marks; and a plurality of GRE tunnels are built between the private network side and the public network side using limited public network address, which realizes the GRE tunnel traversing network address conversion equipment.

The invention relates to a network communication area and discloses a method for penetrating the NAT. The method mainly includes: step S1: the communication terminal after the NAT device interacts with the NAT device to get the public network address and / or port behind the NAT from the NAT; step S2: the communication terminal fills the private network address and / or port information of the packet net payload as the public network address and / or port, and send the packets to the NAT device. The invention discloses the corresponding communication terminal and NAT device to support the implementation of the above method. Compared with the existing technology, the invention does not require NAT device to support the ALG (application layer gateway) and need not realize the STUN (UDP simple penetration mode of NAT) protocol, so it eliminates the limit of the static manual configuration.

The invention discloses a lightgage steel joist partition wall adaptive to a building error of a building structural body and a construction method thereof. The partition wall comprises a lightgage steel joist framework and a partition wall plate, wherein the lightgage steel joist framework comprises a ceiling guide rail with a preserved hole, a ceiling keel, a top keel, a vertical keel and a bottom keel from top to bottom; the ceiling guide rail is fixed on the lower part of a ceiling structural body through a fixing element; the ceiling keel and the top keel are provided with upper and lower adjusting screw rod through holes distributed at intervals; the ceiling keel is adjustably fixed below the ceiling guide rail by using the upper and lower adjusting screw rods and a matched upper nut; the upper and lower positions of the top keel on the upper and lower adjusting screw rods are adjusted by using a lower nut; and the two nuts rotate in different directions. By adopting the partition wall, non-destructive detachment can be realized in a building process, a partition wall product is assembled in a modularized way, material waste caused by field cutting in a built-in constructionprocess is avoided, convenience is brought to assembly and disassembly, the consumption of resources used during household building and in the using process is lowered and the service life of households is prolonged. The partition wall can be widely applied to household building construction.

The invention discloses a power line carrier-based LED visible light communication system, comprising an uplink and a downlink. The downlink comprises a PC transmitting terminal, wherein the PC transmitting terminal accesses an electric power grid via a power line PLC modulator, a power line PLC modulator is connected with the electric power grid and is connected to an FPGA encoder, and the FPGA encoder is connected to a an LED light-emitting device; and a plurality of terminal devices, wherein each terminal device is connected to an FPGA encoder, the FPGA encoder is connected with a signal processing module, and the signal processing module is connected with a photodetector. Optical signals emitted by the an LED light-emitting device is converted to electrical signals by the photodetector, the electrical signals are then amplified and processed by the signal processing module to be recovered into signalsidentical with signals modulated by the PC transmitting terminal, and at last the signals are transmitted to the terminal devices via the FPGA encoder. The uplink is configured to be symmetrical to the downlink, so as to achieve a full-duplex communication.

The invention provides a direct current monopole grounding fault ride-through method for a multi-port flexible high-voltage direct current power transmission system. The fault ride-through method is realized through coordination matching between an MMC (modular multilevel converter) based on low-resistance grounding and having negative electric level output capability and a mechanical direct current isolation switch; in a fault period, by regulating common-mode component of a reference voltage of each MMC bridge arm, fault transient state overvoltage can be eliminated under the premise of not sacrificing the controllability of the converter; meanwhile, by overlaying a fault pole bridge arm reference voltage with a first reference voltage signal and by controlling a fault pole bridge arm current to be zero, the mechanical direct current isolation switch can isolate direct current fault in a zero current condition, so that foundation is laid for the application of the mechanical direct current isolation switch in the multi-port flexible direct current power transmission system; and in the fault period, the MMC forms a loop through sound direct current bus-alternating current side low-impedance grounding pole-ground, so that transmission of half rated active power can be maintained.

The invention discloses a non-flux observation doubly-fed induction generator low voltage ride-through control method and a system, which can be applied to excitation control on a rotor-side converter of the doubly-fed induction generator in the case of deep power grid fault. The specific implementation method comprises steps: once deep fault is detected to happen to the power grid, rotor current of the doubly-fed induction generator is instantly controlled to directly track stator current at a certain ratio, and a certain compensation term related to stator voltage is injected to a rotor current instruction for providing dynamic reactive support. The invention also provides a control system structure diagram for realizing the above principle. Compared with de-excitation control, flux tracking and other low voltage ride-through excitation control methods, no flux observation step is needed for generating a transient control instruction, the structure is simple, multiple control objectives such as electromagnetic torque ripple suppression or dynamic reactive power compensation can be realized, and the low voltage ride-through ability of the doubly-fed induction generator is greatly enhanced.

The present invention provides a session method and apparatus based on session initiation protocol. The session method is establishing a SIP message channel between two session terminals and using the SIP message to load and transmit media message. According to the invention, a SIP message and a RTP / RTCP message traversing a NAT can be implemented and then a session between a user agent and other user agent of private network can be implemented without function of a NAT gateway supporting a ALG and without setting additional STUN server.

The invention discloses an SIP call-based traversal network address translation method and an SIP call-based traversal network address translation. The method comprises the following steps that: a private network user performs the SIP call, and signalling proxy equipment, to which the private network user belongs, performs application layer SIP protocol analysis of an SIP message, judges whether media channel information of the application layer SIP protocol of the SIP message is needed to be modified or not according to the analyzed result, if so, modifies the media channel information into media addresses and ports which are distributed by the network and perform communication with opposite terminal network elements on media proxy equipment, and sends the modified message; and the private network user establishes media connections with an opposite terminal user through the media addresses and the ports. Through the method and the system, the SIP call-based NAT traversal is realized, without upgrading terminals and NAT equipment and increasing the loads of the NAT equipment.

The invention discloses a low voltage crossing method of a DC outward transmission system of a large-scale photovoltaic power station. When an AC power grid has different types of faults, the whole system has problems such as grid-connected current distortion and DC bus overvoltage in a basic voltage current double closed-loop control strategy and cannot realize low voltage crossing. Under the condition, a novel low-votlage control method combining a dynamic switching control method of a photovoltaic power generation module MPPT mode with current converter positive and negative sequence doublecurrent loop control of VSC of an optimized DDSRF-PLL (Decoupling Dual Synchronous Reference Frame based Phase-Locked Loop) is provided. Via coordination of a front-stage photovoltaic power station and a back-stage VSC current converter, influence from overvoltage and a negative sequence component of the DC bus to grid-connected current is suppressed efficiently. Low-voltage crossing operation ofthe large-scale photovoltaic power station is realized successfully and the capacity of stable operation of a large-scale photovoltaic power station accessing system is greatly improved.

The invention is used to realize the transparent transmission of layer-two IPv6 message in IPv4 network so as to realize the IPv6 message to cross over IPv4 network.

The invention implementation example discloses a method, a system and a device for the message transmission. The message transmission method includes the steps that the indication message of a first network is received; the source address and the destination address of a second network type message are carried by the indication message of the first network; the source address of the second network type message is obtained according to the indication message of the first network; the indication message of the first network is translated into the indication message of the second network; the indication message of the second network is transmitted to the source end of the second network type message. Based on the method, the system and the device for the message transmission, the situation that the ICMP message is sent back to the source end of the IPv6 message is realized; the source end of the IPv6 message adjusts the length of the IPv6 message according to the ICMP message and resends the IPv6 message; finally, the situation that the IPv6 message passes through the IPv4 network and reaches the destination is realized.

The invention discloses a method for building an NAT crossing channel by a system terminal unit, which comprises the following steps: the terminal unit of a calling party system respectively obtains a data receiving port and an network address on forwarding service nodes, the data receiving port and the network address on an NAT unit, and the data receiving port and the network address on the system terminal unit by the forwarding service nodes and sends the data receiving ports and the network addresses to the terminal unit of a called party system; a data sending port of the terminal unit of the called party system respectively carries out a through testing, a forwarding testing and a crossing testing in sequence towards the terminal unit of the calling party system and obtains the network address and the port of the data receiving port of the terminal unit of the calling party system; the network address and the port received by the data receiving port of the terminal unit of the called party system are sent to the terminal unit of the calling party system. The method for building the NAT crossing channel by the system terminal unit of the invention takes the communication diversity of multilevel NAT from terminal to terminal into consideration, makes the most of network resources in a private network formed by multilevel NAT and can realize the crossing of NAT under a plurality of occasions.

The invention provides a method for realizing NAT traversal. When an NAT device determines that a received control message sent by a first network device in a private network to a second network device in a public network is a specified control message based on a GAT-1400 protocol, a first private network IP address and a first port number in a URL carried by the control message are acquired; NAT(Network Address Translation) is performed on a second private network IP address serving as a source IP address of the control message according to an NAT strategy to obtain a public network IP address, and the public network IP address is taken as a target IP address for converting the first private network IP address; a port number range is searched for an unoccupied idle port number corresponding to the public network IP address to serve as a target port number for converting the first port number; and the first private network IP address is converted into the target IP address, the firstport number is converted into the target port number, and the converted control message is sent to the second network device in a public network.

The apparatus comprises: FA (foreign agent) device, MB (mobile bridge) device, and HA (home agent) device. The method thereof comprises: the FA device establishes and maintains the layer two mobile binding, and sends a registration message carrying the 802 MAC address of MB device to HA device; according to the received registration message carrying the 802 MAC address of the MB device, said HA makes a layer two mobile binding for the MB device; by learning the MAC address, getting the 802 MAC address of MH; making a layer two mobile binding for the MH.

The invention provides an underground semiconductor refrigerating device which comprises a base pipe, a lower connector, a heat-insulating box, a heat-conducting block, a semiconductor refrigerating sheet, a radiating block, a heat-insulating box cover and an upper connector, wherein the lower connector and the upper connector are respectively sleeved on the base pipe from the lower end and upper end of the base pipe; extending parts of the lower connector and the upper connector are lap-jointed; the heat-insulating box is sleeved between the base pipe and the lower connector or the upper connector; a heat-conducting through hole matched with the heat-conducting block is arranged on an outer wall of the heat-insulating box; the heat-conducting block, the semiconductor refrigerating sheet and the radiating block are embedded into the heat-conducting through hole in turn from outer to inner; and the semiconductor refrigerating sheet is used for forming a refrigerating surface on an inner surface and a radiating surface on an outer surface under a working state. According to the underground semiconductor refrigerating device, a temperature difference of the inner and outer surfaces is formed on the semiconductor refrigerating sheet and a heat conducting flow from inner to outer is formed at the heat-conducting through hole by the heat-insulating box, so that the real-time control on the required temperature in the heat-insulating box is realized.

The present invention provides a message sending method, a message sending device, a message sending system, and a CGN device. The method includes the following steps that: a request message sent by apublic network device is received, wherein the request message carries a destination IP address, the port information of a destination, and the public network IP address of the public network device;the private network IP address of a private network device to be accessed by the public network device and the port information of the private network device are determined according to the public network IP address; the destination IP address in the request message is replaced with the private network IP address of the private network device, the port information of the destination is replaced with the port information of the private network device, so that a first message is obtained; and the first message is sent to a home gateway which the private network device is plugged in. With the message sending method, the message sending device, the message sending system, and the CGN device of the invention adopted, a problem that the public network device cannot access the private network device under the home gateway in a DS-Lite environment in the prior art can be solved, and the traversal of the public network device to the private network device is realized.

The invention relates to a remote training system, and provides an all-media remote training system based on unified communication, which is used for resolving the problems of poor generality, interaction deficiency and single media form of the remote training system in the prior art. The system comprises a system management module for performing divisional management, account management, rights management, system configuration, courseware management and number management, an online training module for drawing up a training plan, selecting a training content and performing interactive communication and group discussion, an online examination module for performing question bank management, examination paper management, online examination and self practice, a training management module for setting a training program, a training form, drawing up a training scheme and implementing online survey, a group management module for grouping training objects, a target difference module for managing learning progress by analyzing a learning behaviour and a learning content, and a technical support module for providing technical support to the training system.

The invention discloses an NAT crossing system of a conference TV, which comprises a communication control module and a plurality of conference terminals, wherein at least one of a plurality of conference terminals is located in an inner network, a plurality of conference terminals are connected with internet through a Router and an IP address obtaining unit, and the communication control module is connected with a plurality of conference terminals mutually through the internet. The NAT crossing system also comprises a gatekeeper which is connected with the internet, wherein the gatekeeper comprises an IP address analytical element which is used to analyze an outer network IP address corresponding to a registration request signal according to the registration request signal which is sent by the conference terminals in the inner network to the gate keeper. The invention also discloses an NAT crossing method of the conference TV. The system and the method can conveniently realize NAT crossing between the inner network and the outer network under the condition that the cost is not increased, and the system and the method are widely applied in various enterprise TV conferences.

The invention discloses an anthraquinone general formula compound and application thereof. The general formula compound is shown in a formula (1) in the specification, and in the formula (1), n is aninteger of 1-2; when n is 2, two L groups in the formula (1) can be different, and two Ar groups in the formula (1) can be different; X1-X8 are independently selected from C, CR or N, when any one ortwo of X1-X8 represent C, the C atom is connected with L, and R is selected from a hydrogen atom, alkyl of C1-C10, substituted or unsubstituted C6-C30 aryl, or substituted or unsubstituted C3-C30 heteroaryl; the Ar is selected from substituted or unsubstituted C6-C30 aryl, or substituted or unsubstituted C3-C30 heteroaryl; and the L is selected from single bonds, substituted or unsubstituted C6-C20 arylidene, or substituted or unsubstituted C3-C20 heterocyclic arylidene. The compound shows excellent device performance and stability when serving as a main body material in a light-emitting layerof an organic light-emitting device (OLED), and meanwhile the OLED adopting the general formula compound is within the scope of right protection.

The invention provides a method and a device for NAT (Network Address Translation) traversal of an SIP (Session Initiation Protocol) message in a Genesys environment. NAT traversal of the SIP message can be realized without special authentication of Genesys, the work efficacy of the Genesys can be sufficiently utilized, and the cost is saved. The method for NAT traversal of the SIP message in the Genesys environment comprises the steps of loading a module which is responsible for NAT traversal of the SIP message in an SIP proxy server; performing parameter setting on the module; and forwarding an SIP message request going through the parameter setting.

The invention provides a DC voltage transformation subunit and a DC transformer comprising the DC voltage transformation subunit. The DC voltage transformation subunit comprises a fault isolation voltage equalization module and a DC / DC converter, wherein a high-voltage side of the fault isolation voltage equalization module is connected with a high-voltage direct-current bus, a low-voltage side ofthe DC / DC converter is connected with a low-voltage DC bus, the mass and the occupied area are small, cost is low, a DC transformer of the DC voltage transformation subunit comprises a plurality of DC voltage transformation subunits. The DC voltage transformation subunit is advantaged in that high-voltage sides of a plurality of DC voltage transformation subunits are connected in series, withstand voltage class requirements are met, low-voltage sides of the multiple DC voltage transformation subunits are connected in parallel, the high-power requirement is met, the number of layers of the DCvoltage transformation subunits is greatly reduced, the occupied area is reduced, cost is saved, different application scenes of one-way power flowing and two-way power flowing can be met, and automatic isolation and crossing of faults on the high-voltage side can be achieved.

The invention provides a system and a method for forwarding stream media data, which realize crossing of a private network by adding a relay server positioned at a public network between a client-side and a forwarding server; therefore, no matter whether the client-side and the relay server are in different private networks, the delay server is capable of requesting the stream media data from a media source toward the relay server and forwarding the stream media data to the client-side. Obviously, the reliability of stream media communications for the client-side is improved, thereby effectively increasing satisfaction degree of the user.

The invention provides a browser-based file transmission processing method and a browser. The method comprises the steps of acquiring the file identifier of a to-be-transmitted file, reading the content of the to-be-transmitted file from the first byte of the file according to the byte order thereof, and uploading the file identifier-contained content of the file to a server in the HTTP POST manner. Since the network information is acquired by users from the server generally based on the HTTP protocol, the transmission of data packets based on the HTTP protocol is allowed by all kinds of firewalls. Therefore, in the embodiments of the invention, files are uploaded to the server by the browser based on the HTTP protocol instead of the FTP protocol in the prior art, so that the firewall traversal of uploaded files to the server from the internal network is realized. In this way, the communication security of the internal network is ensured, and the flexibility of the communication service is improved at the same time.

The invention provides a modularized multi-level flexible DC (Direct Current) topology circuit applicable to fault ride-through. The topology circuit comprises a modular cascade circuit, a voltage switching circuit and a compensation circuit; after the modular cascade circuit is connected with the voltage switching circuit in parallel, the modular cascade circuit is serially connected with the compensation circuit. According to the modularized multi-level flexible DC topology circuit applicable to fault ride-through provided by the invention, the DC fault ride-through can be simply and effectively realized, therefore the modularized multi-level flexible DC topology circuit is applicable to the field of a high-voltage DC overhead line with high capacity.

The invention relates to a structure for supporting and crossing of a water-stop curtain through an old bottom plate obstacle, and a construction method of the structure. The structure comprises the basement bottom plate obstacle, a cement stirring occlusive soldier pile, a grouting soldier pile and a high-pressure jet grouting pile. A mode of 'cement stirring-existing old basement bottom plate obstacle-high-pressure jet grouting' is adopted to form a deep stirring and jetting water-stop curtain comprehensive body, the problem that as for a conventional deep foundation pit support water-stop curtain construction method, the large-thickness old basement bottom plate obstacle cannot be crossed can be solved, meanwhile the problem that old buildings are concentrated on the periphery of a construction area, and consequently the upper part is not suitable for directly adopting high-pressure jet grouting for pile forming is solved, and the structure is suitable for terrain working conditionswith complex sites.

The invention discloses a simulation operation support system, and aims to solve the problems that an existing simulation operation support system is large in wide-area interconnection difficulty, large in repeated simulation experiment workload and large in cross-language and cross-platform difficulty. The system comprises a federation management module, a declaration management module, an extended object management module, a time management module, an ownership management module and a data distribution management module. Modules of the system are communicated by WebService service, object management is expanded, LRC entity-level management is achieved, two data interaction technologies of WebService and MQ are adopted, the applicability of the system to the simulation scale and the simulation form is achieved, and configurable distributed operation structure design is achieved by configuration documents of the system.

The invention relates to a wave power generation system low voltage ride through coordination control method, which is used for coordinating and controlling a network side controller, a machine side controller and a super capacitor energy storage device according to the power of each link during a fault period. The method comprises the following steps that the network side controller adopts voltage outer loop and current inner loop control based on power grid voltage orientation; when a low-voltage fault occurs in a power grid, a machine side controller works in a rotor energy storage mode, and a rotor rotating speed reference value is obtained by a direct-current bus voltage outer ring; when the machine side controller works in a rotor limit rotating speed mode, the rotor rotating speed reference value is set as a rotating speed limit value; the super capacitor energy storage device is controlled by a power outer ring and a current inner ring, the power outer ring is used for maintaining power balance at two ends of the direct-current bus, and the current inner ring is used for realizing rapid tracking control; and therefore, the machine side controller, the network side controller and the super capacitor energy storage device have different operation states under different conditions.

The invention provides a session method and device based on the session initiation protocol. The session method establishes a SIP message channel between two ends of the session, and utilizes the SIP message to carry and transmit media messages. According to the present invention, SIP messages and RTP / RTCP messages can traverse NAT without the need of NAT gateway to support ALG function, and without setting additional STUN server, so as to realize the conversation between the user agent in the private network and other user agents .

The invention relates to a packing case accessory and particularly discloses a base plate used in a handling packing case. The base plate used in the handling packing case comprises a plate body and is characterized in that the size of the plate body is the same as that of the inner diameter of the packing case, and four corners of the plate body are provided with perforations which are mutually symmetrical. The base plate is simple in structure, convenient in packing, low in production cost, large in packing quantity, and applicable to long-distance transportation for preventing handling collision, and effectively guarantees the product quality, thus being suitable for wide popularization and application.

The invention provides a method for realizing NAT (network address translation) traversal through extranet mapping IPsec (internet protocol security) massage. The method is characterized by the steps that NAT equipment receives a packaged massage fully certified by the IPsec and conducts network address conversion on the packaged massage so as to obtain a converted massage; and the extranet receives the converted massage and restores the IP address in the converted massage according to an address mapping table established by the extranet equipment in an IPsec tunnel consultation, and certifies the restored massage. According to the method, NAT traversal of the massage fully certified by the IPsec tunnel is realized.