Finally the conclusion and future work are drawn in Section 5.2.?Related WorkIn recent years, significant approaches for activity recognition have used audio/video sensors [17], wearable sensors [18,19] and embedded sensors [20,21]. However, several problems are associated with the first two approaches; Site URL List 1|]# for instance, audio/video sensors are not practical due to privacy issues, require a large storage space for recording streams, and their accuracy also depends on appropriate location of the sensor while considering the day/night vision problems and the complex environment. Wearable sensors are uncomfortable and inconvenient for users, and their accuracy depends on the body attachment position. Embedded sensors are an acceptable solution for sensing the environment (e.
g.
, smart homes) without disturbing inhabitant privacy and without adding the extra burden of wearing sensors. Therefore, several studies have been conducted to determine effective and accurate activity classification-based behavior analysis methods for smart homes. Rashidi et al. [15] tracked Inhibitors,Modulators,Libraries the regular activities to monitor functional health and detect changes in an individual’s Inhibitors,Modulators,Libraries patterns and lifestyle. They described Inhibitors,Modulators,Libraries an activity mining and tracking approach based on Markov models and validated their algorithms on data collected in physical smart environments. Similarly, Kasteren et al. [22] used a probabilistic model dynamic Bayesian network using a less parametric approach to give better results.
They Inhibitors,Modulators,Libraries showed how the use of a sen
Monitoring the internal strain state of fiber-reinforced polymer materials has become an important issue in many performance demanding engineering applications (e.
g., aerospace, naval, civil). Fiber Bragg grating (FBG)-based sensors are excellent candidates for that purpose as they combine many Inhibitors,Modulators,Libraries advantages over conventional sensors (e.g., strain gages). Such advantages are, Inhibitors,Modulators,Libraries for example, their small size, immunity to electromagnetic interference, Inhibitors,Modulators,Libraries multiplexing capabilities, resistance to Inhibitors,Modulators,Libraries corrosion and self-referencing ability, together with an often linear response that is encoded in the change of their reflected resonance wavelength. The possibility of embedding optical fibers in anisotropic materials has already been demonstrated in numerous investigations [1�C4].
Most of the work published so far has focused on axial load and temperature variations in addition to out-of-plane strain, which is a key parameter in the structural integrity of anisotropic materials [5�C7]. Cilengitide GSK-3 In recent years substantial research efforts http://www.selleckchem.com/products/jq1.html have also attempted to develop multi-parameter FBG sensors. Several reports have described the characterization of gratings subjected to transversal strains which can induce molecular weight calculator birefringence to the optical fiber and therefore split the reflected Bragg peak into separate ones, each relative to polarization axis [8].