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Based on a comprehensive analysis of the production characteristics of the electronic components enterprises, this paper describes the quality tracing model which focuses on the quality data package, establishs a unified data package model and proposes a framework of quality tracking in the context of the electronic components industry. In order to solve the dilemma that product quality problems can...
In this paper, an electronic components inventory model with fuzzy multi-parameters is considered. Economic order quantity (EOQ) is developed for optimal order quantity with all parameters assumed to be exact or crisp. Actually these parameters are not precise while varying over a range. In such case fuzzy set theory is applied to electronic components inventory planning and control problems. With...
Learner models are of great importance in the construction of intelligent tutoring systems. In this paper, after introducing intelligent tutoring systems and learner models, four kinds of classical learner models called Stereotypes Models, Overlay Models, Buggy Models and Constraint-Based Models and their properties are discussed in detail. Finally, we compare these four kinds of learner models in...
Desalinated water, which could destroy the original balance of pipe networks and water when transmitted in water distribution system, would result in the substandard effluent in pipe ends such as high turbidity, chromaticity or iron content caused by iron release. In this paper, a trial network was constructed in the laboratory to simulate the water quality condition of real water distribution system...
Based on the coordinate transformation theory, arbitrary prism invisibility cloaks which is composed of complex, anisotropic and inhomogeneous materials are designed, the permittivity and permeability tensors of the materials are deduced for arbitrary prism cloaks. Such cloaks should be effective at all frequencies. Numerical simulation results are given to validate the arbitrary prism invisibility...
Ten 220 kV/66 kV composite insulators were selected to study the performance of silicone rubber sheds, which were utilized different time in the northeast of China, the hydrophobicity, loss-recovery-transference of hydrophobicity, the shore hardness, the tensile, tearing, volume resistivity and dielectric strength of silicone rubber were determined. The test results indicated that there is no obvious...
Faced with the evolution of the economic environment, some environmental factors which were easily mastered by enterprises are disintegrating, and the business environment of enterprises are transforming from relatively steady statistic one to more and more complex dynamic one. Today crises have become practically the norm in an environment that is both unstable and unpredictable. Crises have thus...
Using the coordinate transformation method, we design different shapes of invisibility cloaks and propose a division way to calculate the permittivity and permeability tensors of the invisible materials. Such cloaks should be effective at all frequencies. Numerical simulations results are provided.
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