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In this work, the authors introduce a non stationary time-frequency domain decomposition technique for modeling high resolution sea backscatter. In doing this, empirical mode decomposition (EMD) method is applied firstly for denoising the in-phase and the quadrature-phase components. Then, the maximum likelihood estimation (MLE) method is employed in the intensity domain to estimate the shape and...
The idea of lip reading as a visual technique which people may use to translate lip movement into phrases without relying on speech itself is fascinating. There are numerous application areas in which lip reading could provide full assistance. Although there may be a downside to using the lip reading system, whether it may range from problems such as time constraint to minor word recognition mistakes,...
Large urban sewage systems are usually provided with complex hydraulic structures, characterized by geometrical particularities. Consequently, considering the extreme turbulent state of the water currents and their free surface shape, the flow associated to such structures is very diverse and unique. Under these circumstances, in order to analyze the intricate involved phenomena, the only feasible...
A precise, stable and invertible model for surface reflectance is the key to the success of photometric stereo with real world materials. Recent developments in the field have enabled shape recovery techniques for surfaces of various types, but an effective solution to directly estimating the surface normal in the presence of highly specular reflectance remains elusive. In this paper, we derive an...
We propose the use of a light-weight setup consisting of a collocated camera and light source – commonly found on mobile devices – to reconstruct surface normals and spatially-varying BRDFs of near-planar material samples. A collocated setup provides only a 1-D “univariate” sampling of a 3-D isotropic BRDF. We show that a univariate sampling is sufficient to estimate parameters of commonly used analytical...
Ihis paper evaluates the pertormance ot dynamic element matching (DEM) in digital-to-analog-converters, when the unit conversion cells of the converter have finite output resistance. DEM is already known to be effective against the static amplitude, timing and pulse shaped mismatches. However, the effect of output resistance and its mismatches has not been studied. A comprehensive code-dependent output...
The consequences due to lightning on different building shapes needs a comprehensive knowledge in order to provide the information to the common man. This paper is mainly concern with the development of a small scale model to study impulse flashover and attachment pattern of protected building structures due to lightning strike. The lightning strike pattern of buildings is based on the practical experimental...
To improve the efficiency of wind turbines, permanent magnet synchronous generator has been used instead of doubly-fed induction generator. Permanent magnet synchronous generator has higher efficiency than doubly-fed induction generator because it has no winding loss in the rotor, but it has cogging torque which increases the cut-in speed of wind turbines. Cut-in speed is a kind of major design factor...
Relief is one of the key components of the landscape. Therefore, its mapping and exploring has been done for centuries. Ways of examination the impact of the relief have been considerably extended by using geographic information systems. But until recently, it was difficult to study in detail the micro-relief components of relief. This was due to the fact that there were not sufficiently detailed...
Torsion links are components which couple inner and outer cylinders of a landing gear mechanism. They prevent torsion or twisting between the cylinder and piston components in the structure. The integrity of this component is essential to prevent shimmy vibrations in an aircraft landing gear. Failure of this component is thus catastrophic for the aircraft. The typical geometry of torsion link of a...
Predicting the temporal evolution of images is an interesting problem that has applications in surveillance, content recommendation and behavioral analysis. Given a single image or a stream of images with timestamps, the goal of this work is to predict possible images that could appear at different time instances in the future. We propose a data-driven Riemannian shape theoretic approach for this...
Automated object's activity analysis has been and still remains a challenging problem and motion trajectories provide rich spatiotemporal information for this purpose. This paper presents a novel descriptor to analyze object activity based on object trajectories. In the proposed descriptor extraction technique, object's change in direction is extracted in different level of resolution. One of the...
The development of algorithms and models to be used for prediction of the reliability and health monitoring of components and sensors is of great importance in aerospace, automotive and power generation industry. For this purpose metamodels have been developed that are based on physical simulations and that are able to quantify the impact of uncertainties on system behavior. These surrogate metamodels...
It is well-known that the NeQuick 2 model provides analytical expressions showing a relationship between topside and bottomside ionospheres. Its bottomside thickness parameter (B2bot) is a key parameter for studying topside electron density profile (EDP) and topside parameters, and its topside scale height (Hsc) is also used to identify the topside electron density profile. The B2bot computed using...
Interior permanent magnet synchronous motors (IPMSMs) are used in various applications. It is desirable to reduce the amount of Dy used in the rare-earth magnets contained in IPMSMs, but Dy-free magnets can easily be irreversibly demagnetized, leading to the performance degradation of IPMSMs. Thus, this study investigates the influence of the shape of the demagnetized area in a permanent magnet on...
Recently, one of the most important problems is energy shortage. Therefore, it is required the high efficiency electromagnetic device like motors. One of them is interior permanent magnetic synchronous motor (IPMSM). It has a high degree of freedom of shape design because permanent magnets are placed in the interior of a rotor. This paper presents optimal design method of a rotor in IPMSM by differential...
The model reduction method for the finite element analysis such as the zooming analysis is conducted to calculate the AC copper loss of the high speed electric machines. In this paper, the result of the zooming method is validated by the complete analysis and the calculation speed increases by 7.8 times of the complete analysis. Moreover, the zooming method is applied to the analysis of the copper...
In this paper, we introduce a systematic process of design, simulation and experimental validation of a manipulator based on the honeycomb pneumatic network (HPN) structure. The HPN structure shows potential in achieving balance between flexibility and load bearing capacity, which overcomes the shortcoming of pneumatic networks in strength. To reach the best performance of both features above, we...
The Paper work presents an approaches to classify chilli class from their bulk sample chilli images using RGB and HSI and L∗a∗b Model colour features. A rule based algorithm is implemented taking into account, best RGB, HSI and L∗a∗b colour features, 9 colour features were computed for R-(red), G-(green), B-(Blue), H-(hue), S-(saturation), I-(intensity), L-(brightness), a-(chromaticity layer red&green),...
With the improvement of people's living standards, there is no doubt that people are paying more and more attention to their health. However, shortage of medical resources is a critical global problem. As a result, an intelligent prognostics system has a great potential to play important roles in computer aided diagnosis. Numerous papers reported that tongue features have been closely related to a...
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