Abstract: The present disclosure provides a method for identifying modal parameters of engineering structures based on fast stochastic subspace identification, and relates to the field of structural modal parameters identification. The method includes the following steps: collecting responses; obtaining a unitary matrix by performing random projection on and QR decomposition of a matrix; obtaining a small matrix by projecting a Toeplitz matrix onto the unitary matrix; obtaining U, S, V matrices respectively by performing singular value decomposition of the small matrix; performing eigenvalue decomposition; and determining an order interval. According to the present disclosure, the small matrix is obtained through performing random projection on and QR decomposition of the traditional Toeplitz matrix, the dimensionality of the matrix by singular value decomposition is reduced and the computational efficiency of the matrix is improved.

Abstract: After a data request sent by a third-party developer is received, metadata description information of requested data is sent to the third-party developer for the third-party developer to develop a third-party application based on the metadata description information. Program information of the third-party application submitted by the third-party developer is received and the third-party application is deployed in a data container environment. The data container environment stores specific data needed during the execution of the third-party application. The third-party application is executed in the data container environment. The present disclosure solves a conflict between data security risk and opening of high value data.

Abstract: In one aspect, a method for increasing website data transmission speed comprises: obtaining a characteristics attribute set corresponding to a browsing behavior of a user; obtaining at least one rule corresponding to the characteristics attribute set from a rules database; selecting at least one advertisement corresponding to a scenario stipulated by the at least one rule; placing the at least one advertisement to be presented to the user; and monitoring operations of the user with respect to the placed at least one advertisement. Thus, the update and revolution of the rules database are implemented based on advertisement placement effects in real time. as Advantages achieved include low implementation cost, short period, and quick optimization speed. The present disclosure also discloses an advertisement placement administration apparatus and an advertisement placement administration system.

Abstract: The present invention relates to a math-chess and the method of playing it. The math-chess comprises one checkerboard and 32 pieces. The checkerboard is like that used in the ordinary chess. The pieces are in two colors, sixteen pieces each, they are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, +, -, *, .div., X and Y. X and Y can be used to represent any number. The said math-chess is for two players. A game of the math-chess has four stages: disposing, disclosing, moving and concluding. The position is made secretly. The rules of playing are like those used in Chinese checkers. The aim of moving is to form an algebraic expression with the pieces of one's own side so that it can constitute an equation with the opponent's pieces and take them.