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Remaining useful life (RUL) has been attached great importance for the health management of stochastic degrading systems. However, current studies place main focus on continuous degradation processes of systems without the consideration of randomly arriving shocks from changes in inner conditions or external environments. In this paper, we present a new prognostic model to characterize the continuous...
In this paper, an optimization study of molding compounds for a microelectromechanical systems (MEMS) sensor package has been performed. A comprehensive finite element analysis model was established for the MEMS sensor package to assess the stresses and deformations when the package was subjected to temperature loading. A series of stress relaxation tests were performed to characterize the viscoelastic...
Polymer based materials are widely used in electronic packaging. The molding compound, in particular, comprises a significant portion of the package with the purpose of protecting the chips from the environment. Material characterization of molding compounds, therefore, has been a critical issue in predicting the thermo-mechanical behavior and reliability of electronic packaging. One of the distinctive...
We propose a cooperative orthogonal space-time block codes (OSTBC) transmission scheme in the adaptive-gain amplify-and-forward MIMO relaying with NS source antennas, NR relay antennas, and ND destination antennas, and analyze the asymptotic performance of the proposed scheme. Specifically, we explore the instantaneous channel state information (CSI) of source-to-relay channel and design an OSTBC...
The Cu leadframes pre-plated with nickel-coating were implanted with oxygen ion or nitrogen ion by Plasma Immersion Ion Implantation (PIII) technique. The contact angle measurement showed that ion-implantation lead to an obvious change of wettability. The chemical situation of the leadframe surfaces was analyzed by X-ray Photoelectron Spectroscopy (XPS), while the morphology of the leadframes was...
Abstract The potential protective effects of three flavones (chrysin, apigenin and luteolin) against oxidative injury induced by H2O2 or CCI4 on human hepatocytes were evaluated in our paper. The hepatocytes were exposed to one of three flavones at 20, 40 or 60 mumol/L for 30 min and then injured by H2O2 or CCI4 for 1.5 h or 6 h. Biochemical assays showed that pretreatment of hepatocytes with three...
Many polymer based materials, such as molding compound and underfill, are commonly used in plastic encapsulated packages. In spite of many advantages, most of them, however, are hydrophilic and absorb moisture when exposed to a humid environment. Moisture absorption induces swelling and deformation in a package and leads to failure in some cases. For example, when polymer materials swell upon absorbing...
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