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Attractiveness of social network analysis as a research topic in many different disciplines is growing in parallel to the continuous growth of the Internet, which allows people to share and collaborate more. Nowadays, detection of community structures, which may be established on social networks, is a popular topic in Computer Science. High computational costs and non-scalability on large-scale social...
In this study, the model-based fault detection and isolation (FDI) approach of parity-space is adapted to the diagnosis of sensor faults in power systems. Hardware redundancy is conventionally utilized to overcome this problem. However, this is an expensive solution. Instead, we propose to detect and locate faults by the systematic use of the system's analytical redundancy, with a global view of the...
Model predictive control (MPC) is to solve an optimization problem for a finite future at current time and to implement the first optimal control input as the current control input. To improve the performance of the Stirred Tank Reactor, a new method based on predictive hierarchical control was introduced. As a modification of the regulatory controller usually implies higher costs, it is a common...
Based on the model proposed by Yusuf Chisti-Murray Moo Young, effects of aeration rate and MBR structure on cross-flow velocity along membrane surface were investigated for optimization design of MBR. When the aeration rate and cross-sectional area were 200m3/h and 3.9m2 respectively, a cross-flow velocity of 1.25m/s was achieved in the MBR. Due to this higher cross-flow velocity, Transmembrane Pressure...
In this paper, a design and optimization approach for a 2-dof manipulator based on parallelogram mechanism for high dynamic application is proposed. After the kinematic and dynamic analysis, several advantages of the mechanism are illustrated which make it possible to reach good dynamic performance through mechanism optimization. Based on the idea of design for control (DFC), a novel kind of multi-objective...
In order to matches the large-displacement character of the compliant mechanisms, a nonlinear optimization method for designing micro-clamps is presented by combining the theory of element-free Galerkin method(EFGM) and topology optimization. The performance of the micro-clamp produced according to the design result is tested. The structural response analysis and sensitivity analysis are carried out...
In this paper, we study the rekeying issue in IEEE 802.16e WiMAX networks. The existing rekeying scheme the Multicast and Broadcast Rekeying Algorithm (MBRA) unicasts new keys to each subscriber station (SS). This scheme does not scale well since it incurs large communication overhead when the number of SSs increase. In our work, first we propose a general tree-based rekeying scheme, which is more...
Intentional islanding (referred to a micro-grid) holds promise to improve power system reliability and power quality due to its more flexible control. To operate intentional islanding successfully, more efficient and robust control methods are required. A new concept is developed as an enhancement to the application of optimal load shedding for corrective control to support an islanded power system...
We determine by a theoretical analysis the optimal dimension of a piezoelectric actuator attached to a multilayered elastic plate clamped at both ends. The dimension is optimal in the sense of producing maximal plate center flexural displacement. The first-order theory for laminated piezoelectric plates is used. A theoretical solution is obtained. Numerical results calculated from the solution show...
The randomized response (RR) technique is a promising technique to disguise private categorical data in privacy-preserving data mining (PPDM). Although a number of RR-based methods have been proposed for various data mining computations, no study has systematically compared them to find optimal RR schemes. The difficulty of comparison lies in the fact that to compare two PPDM schemes, one needs to...
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