to discrete-time systems. Specifically, several modifications to the closed-loop discrete-time Lyapunov equation are proposed that guarantee that the compensator dynamics are stable. Using fixed-structure controller optimiztion techniques sufficient conditions for stable compensators with suboptimal H a performance can readily be derived. designing continuous-time stable dynamic compensators z(...

Robust model predictive control algorithms often suffer from a high computational complexity due to the large number of variables and constraints involved in the optimiztion problems that are solved at every sampling instant. In this paper we propose an approximate control scheme for polytopic systems based on the interpolation of offline computed robust invariant tubes. The feasible set of the...

phenol is an environmental pollutant present in industrial wastewaters such as refineries, coal processing and petrochemicals products. in this study three phenol degrading bacteria from arak petrochemical complex effluent were isolated which consume phenol. molecular analysis was used to identify bacteria and isolated bacteria were identified as rhodococcus pyridinivorans (ns1), advenella faec...

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Orthogonal Frequency-Division Multiplexing (OFDM) is a spectrally efficient multicarrier modulation scheme, which is employed in the most advanced high-speed wireless communication systems, such as Digital Video Broadcasting (DVB) or Long-Term Evolution (LTE). However, one of its biggest shortcomings is that it produces a signal with a high Peak-to-Average Power Ratio (PAPR), which is undesirab...

For most practical purposes, true topology optimization of a braced frame should be synchronized with its sizing. An integrated layout optimization is formulated here to simultaneously account for both member sizing and bracings’ topology in such a problem. Code-specific seismic design spectrum is applied to unify the earthquake excitation. The problem is solved for minimal structural weight un...

Mining frequent patterns across multiple datasets has received a lot of research interest recently. In this paper, we investigate cost-based query optimization approaches to efficiently evaluate such mining tasks. Specifically, we make the following contributions: 1) We present a rich class of queries on mining frequent itemsets across multiple datasets supported by a SQL-based mechanism. 2) We...

Practical design of tall frame-tube and diagrids are formulated as two discrete optimization problems searching for minimal weight undercodified constraints under gravitational and wind loading due to Iranian codes of practice for steel structures (Part 6 & Part 10). Particular encoding of design vector is proposed to efficiently handle both problems leading to minimal search space. Two types o...

Phenol is an environmental pollutant present in industrial wastewaters such as refineries, coal processing and petrochemicals products. In this study three phenol degrading bacteria from Arak Petrochemical Complex effluent were isolated which consume phenol. Molecular analysis was used to identify bacteria and isolated bacteria were identified as Rhodococcus pyridinivorans (NS1), A...