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Calculation of the measurement error covariance matrix is an essential requirement in data reconciliation methods. Based on the practical measurement network, the measurement operator is proposed and is divided into three categories: basic operator, manual operator, compound operator. Then the estimation of measurement operator error variance-covariance is researched in mathematics statistics. Especially...
The success of Computer Integrated Manufacturing System (CIMS) in petrochemical enterprises relies on correct and systematic research of enterprise integration, including information integration, function integration and software integration. The information integration is the foundation of the other two. However, traditional information integration methods find it difficult to work in the face of...
In this work, an efficient approach for the assessment of achievable performance of decentralized control systems based on a general quadratic performance index involving both system states and inputs is proposed. The performance assessment problem is formulated as an optimization problem subject to constraints in the form of linear/bilinear matrix inequalities which explicitly take the block-diagonal...
In this work, we propose a simplified least squares formulation (SLSF) for dynamic material balancing in chemical processes, which are often described by differential-algebraic equations. We compare the SLSF with traditional techniques, such as steady state data reconciliation (SSDR) and Kalman filter (KF). We also modify the SLSF when its assumptions can't be totally satisfied in some practical settings...
Recent development in complex network theory has boosted the exploration of topological properties of various natural and man-made complex systems. Refinery system is a typical complex system in process industry. However, only plant at equipment level has been studied by the complex network theory. This article treats the whole refinery system at plant level as a network. Study illustrates that the...
A low-power, low-noise direct-conversion 1.8 GHz front-end for WCDMA-type applications features an efficient, robust, digitally assisted self-calibration loop that maintains the IIP2 of the receiver to better than 60 dBm. It has a conversion gain of 38.5 dB, a DSB NF of 2.6 dB, and an IIP3 of -17.6 dBm, consumes 15 mA from a 1.5 V supply, and occupies 1.56 mm2 in a 0.13 ??m CMOS process.
This paper describes a 2.1-GHz CMOS front-end with a single-ended low noise amplifier (LNA) and a double balanced, current-driven passive mixer. The LNA features an on-chip transformer load to perform single-ended to differential conversion. Implemented in a 0.13 um CMOS process, it achieves 30 dB conversion gain, a low noise figure of 3.1 dB, a 40 kHz 1/f noise corner, an in-band IIP3 of -12 dBm...
We explore the challenges of designing RF transceivers for an ultra-low-voltage (ULV) supply with performance that is compatible to commercial standards. The ITRS roadmap projects that the aggressive device size scaling will result in supply voltage reductions to well below IV, in particular for low-power technologies. The use of alternative energy sources also requires ULV operation in some applications...
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