Natural or artificial cementation strongly affects stiffness and damping characteristics of soil deposits. In this paper, it is tried to figure out cementation effects on the spectral response using one-dimensional gr...
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Natural or artificial cementation strongly affects stiffness and damping characteristics of soil deposits. In this paper, it is tried to figure out cementation effects on the spectral response using one-dimensional ground response analysis. A constitutive model is applied which is based on separating the mechanical behavior of cemented soil into two distinct parts, soil matrix and cemented bonds. A non-recursive algorithm was used to calculate the nonlinear behavior of horizontally multilayered soil in frequency domain. The model was verified based on recorded acceleration time histories at sites with cemented alluviums and the results showed good consistency.
Coaching for the Blue Bridge Cup competition requires much effort. It is enlightening for students to study the solutions of typical competition questions. A strange game for the Blue Bridge Cup competition, Carrying ...
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Coaching for the Blue Bridge Cup competition requires much effort. It is enlightening for students to study the solutions of typical competition questions. A strange game for the Blue Bridge Cup competition, Carrying on the topic detail *** recursivealgorithm and non-recursive algorithm are given.
Hanoi Tower problem is an ancient and interesting puzzle and Isabelle is one of famous proof assistants. We have put forward a method to verify the correctness of algorithmic programs based on Isabelle, and have prese...
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ISBN:
(纸本)9781509022397
Hanoi Tower problem is an ancient and interesting puzzle and Isabelle is one of famous proof assistants. We have put forward a method to verify the correctness of algorithmic programs based on Isabelle, and have presented formal derivation and proof about the non-recursive algorithm of Hanoi Tower problem in our previous work. The focus of this paper is to turn the former manual verification to automatic verification by using Isabelle Theorem Prover. On the other hand, we originally find a boundary function, which used to proof termination of our non-recursive algorithm of Hanoi Tower problem. This work realizes mechanically automatic-verifying the complete correctness of our non-recursive algorithm of Hanoi Tower Problem, and overcomes the intricacies of manual verification, improves the verification efficiency, and ensures the trustworthiness and reliability of the algorithm program.
During an earthquake, the amplitudes of seismic wave may amplify significantly as it propagates through the soil layers near the ground surface. Analysis of site amplification potential is strongly influenced by the u...
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During an earthquake, the amplitudes of seismic wave may amplify significantly as it propagates through the soil layers near the ground surface. Analysis of site amplification potential is strongly influenced by the uncertainty associated to the definition of soil thickness and its properties. In this paper, the non-recursive algorithm is used in linear and nonlinear Hybrid Frequency Time Domain (HFTD) approaches for stochastic analysis of site amplification. The non-recursive algorithm causes time reduction of analysis that is the essential base of stochastic analysis. The selected soil stochastic parameters are shear wave velocity, density, damping and thickness. The results of sensitivity analysis also show that the damping ratio is the most effective parameter in PGA at ground surface. The stochastic peak ground acceleration, response spectrum and amplification factor at the ground surface are determined by the two approaches for four sites with different average shear wave velocities. Comparison of the results shows that the nonlinear HI. ID approach predicts closer response to real recorded data with respect to linear HFTD.(C) 2014 Elsevier Ltd. All rights reserved.
Aiming at the problem of quantitative inertia evaluation of a new energy electric power system, the system inertia constant tracking method based on system identification is studied. The method is divided into two cat...
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Aiming at the problem of quantitative inertia evaluation of a new energy electric power system, the system inertia constant tracking method based on system identification is studied. The method is divided into two categories: non-recursive algorithm and recursivealgorithm. The non-recursive algorithm uses a batch of data for batch processing to obtain the estimated value of the identification model parameters. The recursivealgorithm is based on the estimated value of the model parameter at the previous moment and corrects the estimated value based on the new data currently obtained. From the perspective of the identification principle, the difference and internal relationship between the two in terms of calculation storage and identification speed are analyzed. The IEEE typical system is used to compare and verify the experimental examples. Theoretical analysis and experimental results show that the recursivealgorithm has high identification accuracy, stable identification results and fast identification speed. It is suitable for the identification of objects with large numbers of nodes and complex structures, which is conducive to real-time monitoring and fast perception of the inertia constant of the new energy power system.
The tree structure algorithms have been widely used in many computer fields. Developing efficient and reliable tree structure algorithms is a challenging problem in the field of software formalization and trusted soft...
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ISBN:
(纸本)9781728189130
The tree structure algorithms have been widely used in many computer fields. Developing efficient and reliable tree structure algorithms is a challenging problem in the field of software formalization and trusted software. In this paper, initially, the binary tree algorithms are divided into three kinds through induction of the loop invariant structures and output features. Then, PAR method can conveniently develop loop invariants and corresponding non-recursive algorithm programs. Finally, Isabelle is used to formally verify these developed algorithms. This development method not only overcomes the tediousness and error-proneness of traditional manual verification, but also greatly improves the efficiency and reliability of the developed algorithm program. To the best of our knowledge, this is the maiden attempt in the literature to verify a series of non-recursive and efficient binary tree algorithms. The above process forms a theorem proving library that include data types, data structures and lemma related binary tree algorithms, which can significantly reduce the cost of future verification.
In a power system frequency of voltage and current signals changes continuously from rated frequency because of changes in load, generation imbalances, and when switching and fault events take place. As the grid frequ...
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ISBN:
(纸本)9781538647691
In a power system frequency of voltage and current signals changes continuously from rated frequency because of changes in load, generation imbalances, and when switching and fault events take place. As the grid frequency deviates continuously from rated frequency, the use of conventional frequency estimation algorithms produces error in phasor calculation. To identify the presence of error in estimated phasor due to off-nominal frequency, it is essential to compute attenuation factors at that off-nominal frequency. Attenuation factors are helpful to identify the off-nominal frequency from the phasor output which is useful for resampling filter design. Attenuation factors are very useful for performance evaluation of a frequency adaptive phasor measurement unit (PMU). This paper presents a model in LabVIEW to compute attenuation factors at different off-nominal frequency condition as well as to develop a model of frequency adaptive PMU. The performance of re-sampling filter has been tested under over and under frequency condition to efficate the result of attenuation factor.
Binary tree traversal algorithm can be applied in many aspects, such as information encryption, Network, operating systems, cluster computing and so on. We have already proposed a useful method to verify the correctne...
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Binary tree traversal algorithm can be applied in many aspects, such as information encryption, Network, operating systems, cluster computing and so on. We have already proposed a useful method to verify the correctness of algorithmic programs based on Isabelle proof assistant and Dijkstra's weakness precondition theory, and have manually derived and verified binary tree traversal non-recursive algorithms in our previous work. In order to ensure the security of the non-recursive algorithms, the focus of this paper is to construct a unified recurrence-relations expression about preorder, in-order, and post-order binary tree traversal non-recursive algorithms. The recurrence-relations expression make it easier to derive the loop invariants of three algorithms. Meanwhile, we automatically verify the correctness of three kinds of non-recursive algorithms by using a generic proof assistant Isabelle. This work realizes mechanically automatic-verification and overcomes the intricacies and weakness of manual verification, improves the verification efficiency, and ensures the trustworthiness and reliability of the algorithm program.
This paper presents non-recursive algorithm for adaptive observation of linear single-input single-output (SISO) time-invariant discrete systems based on least-squares method. The developed adaptive state observer est...
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ISBN:
(纸本)9781538617533
This paper presents non-recursive algorithm for adaptive observation of linear single-input single-output (SISO) time-invariant discrete systems based on least-squares method. The developed adaptive state observer estimates the parameters, initial and current state vector of the discrete linear system and is suitable for real-time working. Simulations are carried out in Matlab environment and provided in order to prove the algorithm performance.
The advent of phasor measurement unit in power system is revolutionizing the conventional grid towards smart grid. Phasor measurement units are extremely expensive devices which takes into account many aspects of the ...
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ISBN:
(纸本)9781479961085
The advent of phasor measurement unit in power system is revolutionizing the conventional grid towards smart grid. Phasor measurement units are extremely expensive devices which takes into account many aspects of the power system that are not disclosed by the manufacturer while estimating phasors of currents and voltage. This paper aims to build a laboratory prototype of PMU which can estimate the phasor updating process of a commercial PMU at the benefit of improved measurement accuracy, reduced manufacturing cost and increased timely information.
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