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We propose a novel automata model over the alphabet of rational numbers, which we call register automata over the rationals (RAℚ). It reads a sequence of rational numbers and outputs another rational number. RAℚ is an extension of the well-known register automata (RA) over infinite alphabets, which are finite automata equipped with a finite number of registers/variables for storing values. Like in...
With more and more installed smart meters, there is strong need from utilities to use the fast increasing data for different analytics applications. One of the important applications is revenue protection due to electricity theft, meter installation errors or meter malfunction. A data set with real data of more than 6,000 installed meters is applied in the study for revenue protection. The data is...
Accurate fault location in distribution network of power system is an essential technology, yet facing more challenges than that in transmission systems. This study develops novel methods for feeder fault location using current/voltage sensors sparsely deployed in the network, in addition to the voltages and currents measured in the substation. Depending on the available sensor locations relative...
Accurate fault location in distribution networks of power systems is an essential technology, yet faces more challenges than that in transmission systems. This paper presents a novel method for feeder fault location using current/voltage sensors sparsely deployed in the network. Depending on the available sensor locations relative to the fault and the lateral conditions, the algorithm searches every...
Blade tip clearance of wind turbines is a critical operating parameter to prevent catastrophic failures caused by blade striking the tower. There are studies to estimate tip clearance in real time using a physics model. Yet, an accurate tip clearance measurement is highly desired to calibrate the physics model. In this paper, a high-speed camera based portable system for blade tip clearance measurement...
In a new card ticket scraping and vending device of TVM (Ticket Vending Machine), the interaction between the scraper and the super-thin & non-contact IC card was analyzed by FEM (Finite Element Method) in this paper. A new improved project for ticket ejecting module of TVM was proposed to overcome the defects of traditional method of vending tickets with friction wheel, which hurts the cards...
The deformation of a TVM's body frame was calculated and the structural FEA (Finite Element Analysis) was accomplished in this paper. The geometric model and finite element model of TVM (Ticket Vending Machine) were built. To locate the maximum stress and displacement precisely, structural analysis of the TVM's body frame under its gravity was analyzed by FEA software. The results indicate that the...
The tree decomposition of graphs is a fundamental algorithmic tool. It has been shown that difficult problems, such as some NP-complete ones, can be solved efficiently over classes of graphs of bounded tree-width. We consider in this paper the distributed construction of the tree decompositions of network topology graphs. We propose algorithms to distributively construct the tree-decomposition of...
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