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Condensation problems in outdoor RMU exist widely at the area which has a hot and humid climate such as the south of China, resulting in the corrosion of the equipment in the RMU. Once the switch operation mechanism corrodes, it would cause the switch to act abnormally. What is worse, the insulation performance of the equipment will be reduced. Improving the ability of natural ventilation is a safe,...
In this paper, a periodic economic model predictive control (EMPC) strategy with nonlinear algebraic constraint relaxations for water distribution networks (WDNs) is presented. A WDN is usually modeled by a series of differential-algebraic equations. When the hydraulic pressure/head and flow relations in the interconnected pipes are considered, the nonlinear algebraic equations will appear in the...
This paper presents a set-membership approach based on zonotopes for differential-algebraic-equation (DAE) systems with unknown-but-bounded disturbances and noise, which can be subsequently used for guaranteed state estimation and fault detection. Complex systems are usually modeled by differential and algebraic equations, where differential equations describe system dynamics and additionally, algebraic...
Geometric programming (GP) is popular for use in equation-based optimization of analog circuits thanks to GP-compatible analog performance functions, and its convexity, hence computational tractability. The main challenge in using GP, and thus a roadblock to wider use and adoption, is the mismatch between what GP can accurately fit, and the behavior of many common device/circuit functions.
To obtain the attitude of spacecraft by a large field of view CCD system is not an unachievable task. The principal aim of this paper is to research the accuracy of spacecraft's attitude by shooting stars with the large field of view CCD system on the ground. In this paper, the quadrilateral algorithm model and an algorithm of data fusion from a set of real images, are given. The experimental results...
Based on the conception of storing by category as well as taking the cost of storing, fetching and place occupation under consideration, this paper denotes a Artificial Bee Colony inspired Particle Swarm Optimization algorithm intending to figure out the problem of storage position allocation in the warehouse schedule. a value called COI (Cube-per-order index) is introduced in the allocation procedure...
In this paper, a hybrid imperfect preventive maintenance model is proposed and analyzed for the deteriorating system. The hybrid imperfect PM model not only reduces the effective age, but also changes the hazard rate while the hazard rate are increasing with the number of PM. A minimal repair is performed whenever the system fails,. Preventive maintenances are performed at integer multiples of a fixed...
This paper describes a design process of advanced grid equipment including both dynamic simulations and power-hardware- in-the-loop. A case study concerning the insertion of an energy storage system in a large isolated grid is used as an illustrative example. First, the methodology developed to achieve a real-time simulation of the studied grid from its original dynamic model is presented. The real-time...
Internet worms spread fast and destroy strong. An accurate Internet worm model provides insight into worm propagation. It aids in identifying the characteristics in the worm spreading and provides better detection and prevention for a new worm threat. In this paper, based on the classical Kermack-Mckendrick model, we propose a general Internet worm model called SIRS (Susceptible -- Infectious -- Removed...
In this paper, a two-standard mathematical model of the competition between telecommunications standards is established to analyze the relationship of price, technology level and consumer's preference. The result of computer simulation of the model shows the trends of different standards of the profit level, total network size, and total social welfare, on the ground of the ever-increasing technology...
It is controversial for Chinese government to regulate the competition in the telecom industry. As the social welfare would decrease if government supports the development of domestic standard through policy instruments, many people are in favor of the rules of free market selection. The reason of government intervention, coincidentally, is that the policy-makers know domestic standard can hardly...
The capacity performance of the inductively coupled near field communication system in free space is analyzed based on the equivalent circuit model of the system and the information theory. The analytical results provide good guidelines about the estimation of the capacity performance and the antenna design for an inductively coupled near field communication system.
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