85results about How to "Shorten the critical path" patented technology

A method and apparatus are disclosed for improving the maximum data rate of reduced-state Viterbi detectors with local feedback in magnetic recording systems. A read channel signal is processed in a magnetic recording device by precomputing branch metrics, intersymbol interference estimates or intersymbol interference-free signal estimates for speculative sequences of one or more channel symbols; selecting one of the precomputed values based on at least one decision from at least one corresponding state; and selecting a path having a best path metric for a given state.

The invention provides a high-speed 8B/10B coder, a decoder and a processing method thereof for error input. The coder comprises a data character precoding module, a RD calculating module and a data character precoding correction module, and the coder adopts a pipeline structure and a parallel processing method; the data character precoding module, the data character precoding correction module and the RD calculating module are respectively precoded and then post collected; the data character precoding module precodes input data in first-stage flow water, and calculates whether the current input code word can cause RD to turn by a RD_turn module; the RD calculating module calculates a RD value passing through the code word in second-stage flow water, and calculates the obtained RD value by using the former clock period to correct the precoded result of the current code word. The invention respectively adopts the pipeline structure and the parallel processing method when being applied in a high-speed serial interface, thus simplifying the circuit design, shortening the key path and improving speed.

The embodiment of the invention provides a video coding method and device. The method comprises the steps that in a current cycle, a first character and a second character which are consecutive in a character string to be coded are obtained; first candidate values corresponding to the first character are determined, and second candidate values corresponding to the second character are determined; the length of a target interval of the first character is obtained according to the first candidate values and the length of an initial interval of the first character; the length of a target interval of the second character is obtained according to the second candidate values and the length of the target interval of the first character; the lower limit of the target interval of the first character is obtained according to the length of the target interval of the first character and the lower limit of the initial interval of the first character; the lower limit of the target interval of the second character is obtained according to the length of the target interval of the second character and the lower limit of the target interval of the first character; a bit corresponding to the first character is obtained according to the lower limit of the target interval of the first character, and a bit corresponding to the second character is obtained according the lower limit of the target interval of the second character.

The invention provides a nuclear power plant containment shell pressure test strength monitoring system which includes data acquisition modules and a data reading and processing module. The data acquisition modules are distributed in different parts of a containment shell and used for acquiring parameter signals of different parts of the containment shell, wherein the parameter signals include deformation parameters, stress parameters, temperature parameters and settlement parameters. The data reading and processing module is connected with the data acquisition modules, and is used for reading and receiving the parameter signals from the data acquisition modules, eliminating unreasonable parameter signals, and performing calculation according to the reasonable parameter signals to get containment shell strength analysis data. The invention further provides a nuclear power plant containment shell pressure test strength monitoring method implemented using the nuclear power plant containment shell pressure test strength monitoring system. According to the technical scheme, through optimization of the data reading and analytical processing method of the existing nuclear power plant containment shell pressure test strength monitoring system, the problem that there is a need to read data manually and the data reliability is poor in the prior art is solved.

The invention includes M pieces of node machines for storage service, one node machine of metadata and N pieces of client node machines, which are connected to each other through VIA communication network. Running on the node machines for storage service, the modules include system initiation module, module for monitoring request, and module for processing request. Running on the node machine of metadata, the modules include metadata initiation module, monitoring module for request from metadata, and state detection module. Running on the client node machine, the modules include one or more device drive modules of network module based on VIA. The invention realizes zero copy of data transmission, shortened path of network stored data, as well as solves main issues of network storage: network bandwidth, storage access speed and interoperability.

The invention belongs to the design technical field of integrated circuits, in particular to an encryption unit which is suitable for RISC processors, comprising a RSA encryption unit, an SHA encryption unit and a RSA/SHA reusable encryption unit. The encryption function units can be integrated into the RISC processor to accelerate the calculation of public-key algorithm and hash functions and obviously lower the cost of hardware; particularly the RSA/SHA reusable encryption unit fulfills the complex cryptography calculation through hardware, and adopts the software for finishing and configuring upper-layer RSA algorithm so as to realize the scalability of data width. The RSA/SHA reusable encryption unit being used for dealing with the most complex calculation of the cryptographic algorithm greatly accelerates the execution efficiency of the cryptographic algorithm, brings no influence on the pipeline structure of the RISC processor and increases no complexity of the hardware, thus having great compatibility with the RISC structure, and having better application prospect in information security field.

The invention relates to a construction method for a steel plate concrete wall of a primary loop cabin of a high temperature gas cooled reactor, which belongs to the technical field of reactor structures. The method includes: arranging inner bearing steel posts, outer bearing steel posts, bearing crossbeams and connecting beams according to design requirements, sequentially arranging shielding cooling water pipes, outer steel plates, inner steel plates and a plurality of transverse shearing nails to form a wall framework module, hoisting the module to the position of the primary loop cabin ofthe high temperature gas cooled reactor, concreting to form a lower-layer steel plate concrete wall module, hoisting an upper-layer module on the lower-layer steel plate concrete wall module, and cycling so to form the wall of the primary loop cabin of the high temperature gas cooled reactor. By the construction method, time of constructional critical paths can be shortened, cross workload on a construction site can be reduced, and work intensity on the construction site is relieved. Further, accurate execution of construction schedule can be guaranteed while construction quality is improved and construction period is shortened.

The invention is applicable to the field of encryption technology, provides a multiplex wheel conversion circuit, an AES encryption circuit and an encryption method. The AES encryption wheel transformation multiplexing circuit of the invention combines and synthesizes constant matrices, all the linear transformation operations in AES cryptographic algorithm are combined into two composite matrices, namely the composite matrix delta and the composite matrix lambda, so as to shorten the critical path of the AES encryption wheel conversion circuit, reduce the circuit realization area, and realizethe common wheel conversion and the last round conversion by multiplexing the composite matrix multiplication unit 1, the composite field multiplication inverse operation unit and the composite matrix multiplication operation unit 2, thereby saving a large amount of circuit resources.

The invention belongs to the technical field of cryptography, and discloses an FPGA optimization implementation method and system for an SM4 cryptographic algorithm and application, and the FPGA optimization implementation system for the SM4 cryptographic algorithm comprises a circulation type design architecture, a pipeline LUT type design architecture, a pipeline BRAM type design architecture and a pipeline BRAM + REGISTER type design architecture. The circular design architecture comprises a control module, a round key generation module and an encryption module; the assembly line LUT type design architecture comprises a control module, a round key generation module and an assembly line encryption module; the assembly line BRAM type design architecture comprises a control module, a round key generation module and an assembly line encryption module; the assembly line BRAM + REGISTER type design architecture comprises a control module, a round key generation module and an assembly line encryption module. According to the invention, side channel attacks can be effectively resisted, and the encryption performance is improved.

The invention relates to a compression method and device based on a cryptographic hash algorithm. The method comprises: obtaining an initial value of each variable word and a precomputed extension word; carrying out Boolean function processing of the initial values of the first variable word, the second variable word and the third variable word; carrying out compressed summing processing of the precomputed extension word, the initial value of the first variable word, a compensation result and the result of the Boolean function processing, wherein the compensation result being the sum of a constant subjected to preset bit shift and a preset compensation value; performing selection on the result of the compressed summing processing; and carrying out displacement operation on the result of the selection to obtain the compression result of the first variable word of a current cycle. The method can shorten the key path of the algorithm, reduce the time delay of the key path, and increase the throughput of a circuit.

The invention provides an AES (advanced encryption standard) encryption and decryption device which merges an S box with mixcolumns. The AES encryption and decryption device comprises an inversion and mixcolumn multiplexing unit, a first round secret key encryption module, a second round secret key encryption module, a decryption affine transformation module, a first selector, a second selector and a register, wherein the inversion and mixcolumn multiplexing unit comprises an inverse element solving module, an encryption affine transformation module, an encryption mixcolumn module and a decryption mixcolumn module, and the first round secret key encryption module is connected with the encryption mixcolumn module and the first selector; the second round secrete key encryption module is connected with a decryption mixcolumn module; the decryption affine transformation module is connected with the second round secrete key encryption module and the first selector; and the second selector is connected with the first selector and the register. Thus, the AES encryption and decryption device disclosed by the invention can reduce overhead of hardware resources; meanwhile, a critical path is shortened, the chip area is reduced, and operating speed of the AES encryption and decryption device is improved.

The invention is applicable to the field of encryption technology and provides an AES encryption unit based on a composite matrix is provided, an AES encryption circuit and an encryption method. The AES encryption unit is used to realize 4 bytes AES encryption. By combining and synthesizing the constant matrix, all the linear transformation operations in the round transformation are combined intotwo composite matrices, the composite matrix delta and the composite matrix lambda, so as to shorten the critical path of the AES encryption circuit and reduce the area of the AES encryption circuit.

The invention discloses a data flow identifier query method and device. The method comprises the steps: receiving a data message, and extracting a first N-tuple from the data message; transforming the first N tuple by using a first hash function to obtain a first hash value, and transforming the first N tuple by using a second hash function to obtain a second hash value; searching a hash table according to the first hash value, and obtaining a corresponding bucket chain table, the bucket chain table including a specific number of hash buckets; searching a bucket chain table according to the second hash value, and obtaining address information stored in a corresponding hash bucket; obtaining a second N-tuple stored in the corresponding address space according to the address information; and when the first N tuple is consistent with the second N tuple, querying the corresponding data flow identifier in the flow table as the data flow identifier of the data message according to the second N tuple.

The invention is applicable to the technical field of encryption and provides a round conversion multiplexing circuit, an AES encryption circuit and an encryption method. The multiplexing round conversion circuit proposed by the invention combines all linear conversion operations in an AES cryptographic algorithm into two composite matrices of a composite matrix delta and a composite matrix lambdaby merging and compositional operation of constant matrices; thereby shortening the critical path of the AES encryption circuit formed by the multiplexing round conversion circuit, reducing the implementation area of the AES encryption circuit, and realizing ordinary round conversion and final multiplexing round conversion through a multiplexing composite matrix multiplication unit 1 and a composite domain inverse-of-multiplication unit, so as to save large amounts of circuit resources.

The invention relates to a construction method for a shielding cooling system and a steel lining wall of a high temperature gas cooled reactor, which belongs to the technical field of reactor structures. The method includes: arranging a steel lining according to design requirements and welding cooling water pipes to the inner surfaces of the steel lining to form a combined structure module, hoisting the module to the position of a primary loop cabin of the high temperature gas cooled reactor, sequentially binding inner main reinforcement bars, auxiliary reinforcement bars and outer main reinforcement bars, erecting a constructional outer mould plate, concreting between the steel lining and the constructional outer mould plate to form a lower-layer combined structural wall module, hoistingan upper-layer module on the lower-layer combined structural wall module, and cycling so to form the wall of the primary loop cabin of the high temperature gas cooled reactor. Using the construction method can shorten time of constructional critical paths, reduce cross workload on a construction site, relieve work intensity on the construction site and guarantee accurate execution of constructionschedule while improve construction quality and shorten construction period.

The invention discloses a 2n zoom device for a residue number system (RNS) of which the base is {2<n>, 2<n>-1 and 2<n-1>-1}. The zoom device comprises a modulus 2<n>-1 adder, a modulus 2<n-1>-1 adder, an n-bit common binary adder, a sign detection module, a selector and some simple logic operation such as cyclic shift, bitwise negation and the like. The implementation structure is simple and clear; by adding a pipeline register at a proper position, a key route becomes smaller; therefore, an active effect on reduction of the time delay of the key route of the RNS during application of a digital signal processing system is achieved.

The invention is applicable to the field of encryption technology. An AES encryption unit, AES encryption circuit and encryption method are provided. An AES encryption unit is proposed. The AES encryption unit realizes 4 bytes AES encryption. The AES encryption unit combines all the linear transformations into two composite matrices by combining and synthesizing the constant matrices, namely the composite matrix delta and the composite matrix lambda, thereby shortening the critical path of the AES encryption circuit and reducing the area of the circuit.

The invention discloses a rapid unearthing system for a top-down ultra-deep foundation pit and a construction method of the rapid unearthing system. The rapid unearthing system comprises supporting legs, an equipment frame, lifting trolleys, hanging boxes, cables, a cab, an earth excavating machine and a dumper. The supporting legs are correspondingly connected to a platform at intervals. The supporting legs are correspondingly connected to a platform at intervals. The equipment frame is arranged on the supporting legs. The two ends of the equipment frame exceed the side faces of the corresponding sides of the platform correspondingly. The equipment frame comprises main beams and secondary beams. The main beams are connected to the supporting legs. The secondary beams are connected betweenthe adjacent main beams. Protective railings are arranged on the equipment frame along the peripheral edges. The lifting trolleys are installed on the main beams correspondingly. Winches are connected to the lifting trolleys. The hanging boxes are hung below the lifting trolleys through hanging tools. The cab is installed on the side faces of the supporting legs. The cables are connected betweenthe cab and the lifting trolleys, between the lifting trolleys, and between the lifting trolleys and the hanging boxes. The earth excavating machine is arranged at the bottom of the foundation pit. The rapid unearthing system solves the problems that in the prior art, the construction efficiency is low, the cost is high, the number of adopted machines is large, and the occupied space of the machines is large.