In order to develop context-aware applications for ubiquitous computing environments we have defined an MDA approach that defines three layers of models. The first layer captures the conceptual characteristics of the application. This layer defines three complementary points of view of the system that are used to build the task, space and social views of the system. The second layer defines the...

introduction: the purpose of this study was to determine the effects of citrus aurantifolia (ca) extract on smear layer removal in different parts of root canals. materials and methods: thirty-nine single-rooted human teeth were randomly divided into three experimental ( n =12) and one control ( n =3) groups. teeth were instrumented using mtwo rotary instruments. root canals were irrigated with...

using image processing and artificial intelligence systems in agriculture and food industry is increasing daily. the purpose of this research is to study the feasibility of using image processing technique in predicting process of moisture content changes on green tea sheets during the drying using predictive artificial intelligence systems such as: artificial neural networks and adaptive neuro...

Managing extremely large amounts of data with high performance and low power consumption is very difficult. We look at this urgent problem from an architectural perspective and present our prototype design and implementation of a three-layer database storage system, which uses flash-based devices as an intermediate caching layer. The flash-based layer significantly improves the I/O efficiency o...

Security is one of the key issues in communications, but it has not attracted much attention field underwater wireless optical communication (UWOC). This Letter proposes a UWOC encryption scheme with orthogonal frequency division multiplexing (OFDM) modulation, based on three-layer chaotic and discrete Fourier transform (DFT) precoding. The processes are bit stream diffusion, in-phase/quadratur...