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91results about How to "Simplify the solution steps" patented technology

Revocable key external package decryption method based on content attributes

The invention relates to a revocable key external package decryption method based on content attributes. For a trusted authority, 1, initialization is carried out, and system parameters are output; 2, a random number generation algorithm operates; 3, a collision-resistant Hash function is selected, and the Hash value is calculated; 4, a public key and a main key are calculated; 5, the random number is selected, and exponentiation calculation and multiplication are carried out; 6, the collision-resistant Hash function operates, the exponentiation operation is carried out, and a decryption key is obtained. For a data holder, 7, AES data encryption is carried out; 8, an access control matrix is generated; 9, a random number is selected, and an inner product is calculated; 10, multiplication, exponentiation and exclusive-or operation is operated, and ciphertexts are obtained. For a decryption operator, 11, a decryption request and a transformation key are sent. For a mobile storage serve provider, 12, CT2 is sent to an external package decryption agency. For the external package decryption agency, 13, the transformation key is utilized, and the transformation ciphertext is calculated. For the decryption operator, 14, a conversation key is obtained through calculation; 15, AES data decryption is carried out.
Owner:HANGZHOU INNOVATION RES INST OF BEIJING UNIV OF AERONAUTICS & ASTRONAUTICS

Optical waveguide isolator

An optical waveguide isolator for use in an optical communication system is disclosed. The optical waveguide isolator comprises a semiconductive light amplifier structure including a semiconductor substrate of first conductivity type having a surface of a layer to be formed thereon, a first cladding layer of first conductivity type formed on the substrate, an active layer formed on the first cladding layer, a second cladding layer of the second conductivity type opposite to first conductivity type, formed on active layer, a first electrode formed on the surface of the semiconductor substrate opposite to the surface to be formed as a layer, and a second electrode formed on the second cladding layer; the first and the second cladding layers and the active layer form an optical waveguide in which the light wave propagates. The semiconductive light amplifier structure further comprises a light absorptive magnetic material layer having light absorption function for the light wave propagating through the optical waveguide. The magnetic material layer is magnetized so as to have the magnetic-field component in the direction which corresponds to the direction where a magnetic vector of the light wave vibrates, the waveguide structure body has a nonreciprocity optical characteristic that effective refractive index changes into the light wave to which the optical waveguide is propagated according to the magnet-optical effect of the light absorptive magnetic material layer according to the direction of propagation, by the effective refractive index change in the nonreciprocity, the attenuation of the first light wave that the optical waveguide is propagated in the first direction caused when the said waveguide is propagated, becomes small more than the attenuation of the second light wave propagated in the second direction opposite to the first direction caused when the said waveguide is propagated.
Owner:THE UNIV OF TOKYO

Wind power proportion limit value analytical calculation method considering frequency constraints

The invention relates to a wind power installed capacity technology, in particular to a wind power proportion limit value analytical calculation method considering frequency constraints, which comprises the following steps of: modeling a conventional unit of a system to obtain a detailed frequency response model reflecting each physical process; performing equivalent processing on the system to obtain a power system frequency response SFR single-machine equivalent reduced-order model; calculating a wind power ratio according to the fan access capacity and the original capacity of the system, and further calculating system parameters after fan grid connection; substituting into the original single-machine equivalent reduced-order model to obtain a power system frequency response model afterfan grid connection, obtaining a frequency domain expression after system frequency deviation per unit, and calculating an expression of system frequency steady-state deviation; respectively considering the steady-state frequency deviation constraint boundary and the angular frequency change rate constraint boundary of the system to solve a wind power ratio limit value, and taking the smaller value of the two boundaries to obtain an actual wind power ratio limit value. The method is simple in solving step, reduces the calculation complexity, and has certain calculation universality.
Owner:WUHAN UNIV

Print data processor, print system, backup method of print data and print job data, and program

Provided is a print system for generating print data and print job data such that they may be restored from a printed matter. PDL-converted layout data that can be obtained by performing PDL conversion of predetermined layout data is symbolized in a predetermined encoding technique, and image data of the obtained symbol is PDL-converted. The resulting data is combined with the PDL-converted layout data and then supplied to a printer as print data. Printing of this print data results in a printed matter PM, in which a symbol SB is added to a substantive image, i.e., the image of contents desired to represent at the time of layout. By a predetermined restore processor with decode means corresponding to the encoding technique, the symbol SB is read and decoded, thereby faithfully restoring the PDL-converted layout data. Once a document is kept as a printed matter, the reuse of layout data is easy to carry out, without retaining electronic data. Alternatively, print job data composed of layout data having a PDL format and print processing conditions necessary for printing are symbolized in a predetermined encoding technique. Image data of the obtained symbol is PDL-converted and combined with the layout data, thereby obtaining print job data. The execution of print processing of the print job data results in a printed matter, in which a symbol is added to a substantive image, i.e., the image of contents desired to represent at the time of layout. By a predetermined restore processor with a decoding technique corresponding to the encoding technique, the symbol SB is read and decoded, thereby faithfully restoring first print job data. Once a document is kept as a printed matter, reprinting based on print job data can be executed easily and reliably, without retaining electronic data.
Owner:SCREEN HLDG CO LTD

Mine ventilation system building method based on DIMINE software

The invention discloses a mine ventilation system building method based on DIMINE software. According to the method, a mine ventilation system three-dimensional model is built through the DIMINE software; the DIMINE file format of the built ventilation system three-dimensional model is converted into a file format compatible with 3DVent software; according to the ventilation network resolution technology requirements, the mine ventilation network resolution work is completed through combining the actual conditions of a mine; according to the ventilation network resolution result, the mine ventilation system design and modification scheme optimization work is completed; according to the ventilation network resolution result, the three-dimensional visualization and air flow animation simulation software realization technology study of the ventilation network resolution result is developed; and the real three-dimensional visualization and air flow animation simulation of the mine ventilation network resolution result is realized. The method has the advantages that the resolution step is simplified; the work efficiency and the accuracy are improved; the electric energy can be saved; the ventilation cost is reduced; the underground microclimate conditions are improved; and a good operation environment is created for underground workers.
Owner:YUXI MINING
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