30results about How to "Improve randomness" patented technology

The invention discloses a sub-threshold value characteristic-based true random number generator. The true random number generator comprises a rapid oscillator, a slow oscillator, a level converting circuit, a sampling trigger and a signal post-processing circuit, wherein an output end of the rapid oscillator is connected with a data end of the sampling trigger through a level converting circuit; an output end of the slow oscillator is connected with a clock end of the sampling trigger; the output end of the sampling trigger is connected with an input end of the signal post-processing circuit; the output end of the signal post-processing circuit is used as the output end of the generator; and the signal post-processing circuit performs a series of hybridization and noise processing on an output signal of the sampling trigger so as to improve the random characteristic of an output sequence. In the generator provided by the invention, a random source circuit has a simple structure and only a series of odd-stage phase inverter chains need to be cascaded; the generator has high random characteristic; and the random characteristic of the output sequence is enhanced by the enhancement of the sub-threshold value frequency jitter and the signal post-processing circuit with high randomization capacity, so that the output effect is better.

The invention provides a true random number generator and a realization method of the rue random number generator. The realization method comprises the steps: after a VDD/VSS is electrified, a power management unit starts working and provides voltage for all units of the true random number generator; a biasing circuit provides a biasing voltage signal for a second clock source; the biasing circuit in the second clock source provides a biasing voltage for a voltage-controlled oscillator; after being processed by a processing unit, a signal generated from a noise source is used as a voltage signal of an input signal of the voltage-controlled oscillator, and an output signal of the voltage-controlled oscillator is used as the output CLK2 of the second clock source; a signal generated from a circular oscillator is processed by a buffer to obtain a signal which is used as the output CLK1 of a first clock source; digital mixing on the received CLK1 and CLK2 is conducted by a sampler (3) to generate random data; and a post-processing unit processes the received random data of the sampler and outputs a random sequence. With the adoption of true random number generator and the realization method, the phase noise of the oscillation signals can be improved, and the random characteristic of the generated random data is greatly enhanced.

The invention discloses a high-speed random number generation method and apparatus. The apparatus comprises two parts including an entropy source module and an entropy sampling module. The entropy source module is an autonomous Boolean network consisting of digital logic gates; the network consists of an XNOR gate and N-1 XOR gates; N is equal to 3n (n is a positive integer); and the entropy source module can generate a chaotic signal with a wide and flat spectrum. The entropy sampling module is composed of a D trigger, and performs sampling and quantization on the chaotic signal to generate arandom number sequence. The generated random number sequence can pass random number industry test standards (NIST and Diehard statistical tests), and has good random statistical characteristic. The apparatus consists of the digital logic gates, and is simple in circuit structure and easy to integrate and manufacture; and a post-processing algorithm or circuit necessary for a conventional random number generation apparatus is not required, so that the power consumption can be greatly reduced. The high-speed random number generation method and apparatus can be widely applied to the field of information security of secret communication, key distribution, data encryption and the like.

The present disclosure discloses a method of generating a random coded pattern for coding structured light. According to the method, under a certain distribution rule, coding primitives are added one by one using a random probability distribution map, thereby generating a random coded pattern satisfying a distribution requirement of window uniqueness; the random coded pattern may be used independently as a structured light encoded pattern or may be spliced and expanded from basic image elements as the structured light coded pattern. The structured light coded pattern obtained from the method is projected by a projecting device according to a certain field of angle, which may perform spatial coding and feature calibration to the three-dimensional space or a target object, for depth identification. The present disclosure also discloses an apparatus for generating a random coded pattern for coding structured light. The random coded pattern generated by the method or apparatus of the present disclosure has a high randomness and supports a plurality of coding primitives of different shape sizes, such that the identification issues of monocular, binocular or multi-view matching during a depth decoding process may be solved.

The invention relates to a uniform random number generation method for encoding a deep-space communication protocol, belonging to the technical field of deep-space communication and communication signal processing. According to the invention, a k*k dimension pseudo-random number generation matrix is designed, so that the generated pseudo-random number reaches the maximum period and the random performance of the random number is improved; and the bit width of the generated random number is k, and thus the requirement that the bit width is variable is met when the deep-space communication protocol is realized. In addition, a true random number is generated as a seed of a pseudo-random number generator, and thus a true random number which is not limited by the period is obtained and better output random characteristics of the random number are obtained.

The invention provides a BIM-technology-based construction manpower management system comprising a manpower management system unit. Manpower information of the manpower management system unit is associated with a building information model established by a BIM technology to form a BIM-technology-based construction manpower management system. The manpower management system unit consists of a manpower plan management module, a labor contract management module, an education and training management module, an access control system management module, an on-site dynamic management module and a labor wage management module. In addition, the invention also provides a construction manpower management method. The method includes: step A, making early-stage preparation for creating a BIM-technology-based construction manpower management system; step B, creating a BIM-technology-based construction manpower management system; and step C, carrying out dynamic management of the BIM-technology-based construction manpower management system. Therefore, after a construction project uses the system, key information of the manpower management is obtained simply and rapidly, so that refined management of the construction manpower can be realized.

The invention discloses a true random number generating circuit. The true random number generating circuit comprises a high-frequency oscillator, a low-frequency oscillator and a T trigger, wherein the high-frequency oscillator is used for generating high-frequency clock signals, the low-frequency oscillator is used for generating a noise source on the basis of resistance thermal noise, the clock input end CLK of the T trigger is connected with the output end of the low-frequency oscillator, and the noise source generated by the low-frequency oscillator serves as a clock signal. The true random number generating circuit further comprises a multi-stage divide-by-2 frequency divider, wherein the input end of the multi-stage divide-by-2 frequency divider is connected with the output end of the high-frequency oscillator, and the output end of the multi-stage divide-by-2 frequency divider is connected with the data input end T of the T trigger. The low-frequency oscillator conducts sampling on the high-frequency clock signals which are processed through frequency division of the multi-stage divide-by-2 frequency divider, and the output end Q of the T trigger outputs true random numbers. The true random number generating circuit has a good random characteristic, is easy to implement, and saves the chip area.

The invention discloses a true random number generation method and device with a detection and correction function. A random number is taken as an important component of a cryptosystem and is widely applied to a security system. The random number comprises a session key, an initial vector and a digital signature. The device is composed of an entropy source module, a sampling module, an XOR logic gate, a cellular finite state machine, a test module, a CPU and a selection controller. The entropy source module is composed of two identical oscillator structures. Each oscillator is a chaotic oscillator structure based on an autonomous Boolean network. The entropy source module can generate wide spectrum and high bandwidth chaotic signals. After a random sequence is tested through the test module, whether the sequence passes the test or not is judged through the CPU. The sequence is directly output if the sequence passes the test. Data is returned and enters a postprocessing module through an XOR circuit if the sequence does not pass the test. Moreover, a selection controller selects different postprocessing modes to process the data. The processed data enters the test module for test again, until the data passes the test. A random code sequence generated by the invention can pass a random number industry standard test.

The invention discloses a Lorenz chaotic pseudo-random sequence generator based on an m sequence. The generator comprises an initial value selection module, a Lorenz chaotic iteration module, a quantification module and an m sequence disturbance module, wherein the initial value selection module is used for giving an initial value needed by a Lorenz chaotic equation before Lorenz chaotic iterationis started and giving an output value generated in last iteration to next iteration to serve as an initial value; the Lorenz chaotic iteration module realizes operation of the Lorenz chaotic equationthrough floating point fractional arithmetic and generates a chaotic real value sequence; the quantification module converts the chaotic real value sequence into a pseudo-random sequence through a bit sequence design method; and the m sequence disturbance module generates the m sequence through a linear feedback shift register and uses the m sequence to disturb the chaotic real value sequence, the disturbed chaotic real value sequence is returned to the initial value selection module, and next iterative operation is performed. The generator overcomes the defect of randomness of an existing pseudo-random sequence, and the generator has a large key space, can resist an exhaustive attack and meets the requirements of various application occasions.

The invention discloses a fountain code decoding method. The fountain code decoding method includes: generating a first pseudo random sequence and a second pseudo random sequence; generating degree values according to the first pseudo random sequence; generating multiple different random address numbers same in number with the degree values according to the second pseudo random sequence; reading information symbols according to the random address numbers and using the information symbols for code output. The invention discloses a corresponding fountain code decoding device. Realization of strict fountain codes is facilitated in an FPGA (field programmable gate array) or an integrated circuit, the arithmetic speed is high, and implementation complexity is low.

The invention discloses a PUF (Physical Unclonable Function) unit supporting environmental perception, a PUF and a hybrid PUF, which belong to the field of digital integrated circuit design and security and anti-counterfeiting. The PUF unit comprises a first basic PUF unit based on a ring oscillator and an off-chip circuit for perceiving external environment change, and the off-chip circuit is connected in series between the feedback loops of the first basic PUF unit. According to the invention, the off-chip circuit for sensing the change of the external environment is connected in series between the feedback rings of the first basic PUF unit; the corresponding parasitic RC value is changed due to the change of the external environment; the change of the parasitic RC value causes the difference of the delay of the off-chip circuit; the off-chip circuit delay is included in the total delay of the ring oscillator; the change of the time delay causes the change of the frequency of the PUFunit, thereby achieving the coupling of the external environment information into the PUF circuit, generating the unique output related to the environment change, causing the permanent failure of anoutput result through any attempt to change the external physical environment, and enabling the reconstruction not to be carried out.

The invention discloses a code hopping spread spectrum communication system based on a chaos sequence. According to the system, time-sharing multiplexing is carried out on data information and synchronization information; in each time slot, the synchronization information is transmitted first and then the data information is transmitted; a receiving end receives the synchronization information and analyzes the synchronization information to obtain a code hopping pattern and code element synchronization information needed for disspreading during transmission of the data information. Due to the fact that the chaos sequence which is better than a traditional direct spreading sequence in related performance and random performance is applied to a code hopping direct spreading system and serves as the code hopping pattern and a spreading code, the code hopping spread spectrum communication system has better anti-interference and anti-interception performance and has broad development prospects in the anti-reconnaissance communication field.

The invention discloses a hybrid integrated quantum random number generating device and generating system. The device comprises a local oscillation light source and an optical signal processing module. The local oscillation light source is connected to one input end of the optical signal processing module, and the hybrid integrated quantum random number generating device further comprises a straylight eliminator connected to the vacuum state optical signal input end of the optical signal processing module. The random source has the advantages that the stray light eliminating device is additionally arranged at the vacuum state optical signal input end, it is guaranteed that a vacuum state optical field is not interfered, quantum randomness of the random source is guaranteed, the size is reduced, power consumption is reduced, and the integration degree is high.

The invention discloses a borrowing amount prediction method and device, a server and a storage medium. The method comprises the steps of generating user borrowing characteristic data according to borrowing information of a user; Inputting the user borrowing characteristic data into a pre-trained borrowing proportion prediction model, and outputting a plurality of probability values correspondingto different borrowing proportions of the user, the borrowing proportion being the proportion of the user borrowing amount in the remaining available borrowing amount of the user; Determining an optimal borrowing proportion according to the plurality of probability values, wherein the optimal borrowing proportion is a user borrowing proportion corresponding to the maximum probability value; And determining the current borrowing amount of the user according to the optimal borrowing proportion. According to the borrowing amount prediction method, the problem that single borrowing amount prediction has great randomness and volatility is improved, the user borrowing experience is optimized, the user borrowing efficiency is improved, and single borrowing earnings are increased.

The invention discloses a lot drawing method based on a random shuffling algorithm with a weight and application, the method comprises two parts of a lot drawing process and a verification process, a shuffling method is provided for determining a block chain block discharger sequence, if a consensus node cannot be discharged from a block, the block is discharged from a second node, and so on; in addition, a random shuffling function with a weight is adopted, and it can be guaranteed that the output priority sequence probability is in direct proportion to held rights and interests. The lot drawing method can be used for leader node election and committee node election. According to the method, block-out consensus in the asynchronous network can be realized, multiple rounds of consensus are not needed, the requirement on network synchronization is greatly reduced, the Sybil attack can be resisted, and the security is greatly improved.