The Discrete Wavelet Transform (DWT) is a popular tool in the field of image and video compression applications. Because of its multi-resolution representation capability, the DWT has been used effectively in applications such as transient signal analysis, computer vision, texture analysis, cell detection, and image compression. Daubechies wavelets are one of the popular transforms in the wavelet family. Daubechies filters provide excellent spatial and spectral locality-properties which make them useful in image compression.<p> In this thesis, we present an efficient implementation of a shared hardware core to compute two 8-point Daubechies wavelet transforms. The architecture is based on a new two-level folded mapping technique, an improved version of the Algebraic Integer Quantization (AIQ). The scheme is developed on the factorization and decomposition of the transform coefficients that exploits the symmetrical and wrapping structure of the matrices. The proposed architecture is parallel, pipelined, and multiplexed. Compared to existing designs, the proposed scheme reduces significantly the hardware cost, critical path delay and power consumption with a higher throughput rate.<p> Later, we have briefly presented a new mapping scheme to error-freely compute the Daubechies-8 tap wavelet transform, which is the next transform of Daubechies-6 in the Daubechies wavelet series. The multidimensional technique maps the irrational transformation basis coefficients with integers and results in considerable reduction in hardware and power consumption, and significant improvement in image reconstruction quality.

<p> The finite element displacement method with triangular plate elements, is used in the present research program to establish an analytical approach for the analysis of shells and folded plate structures. The Tocher, Rawtani and Cowper displacement functions are used in this analysis and the theoretical displections u, v and w are found to compare satisfactorily with the experimental results. </p> <p> Owing to the limited storage capacity of the computer, the method of tridigonalization is used, rather than the method of direct stiffness assembly. </p> <p> Special considerations for stiffness assembly are necessary; (a) all the elements meeting at a node lie in the same plane and (b) the nodal points lie on the fixed boundary. </p> <p> Experimental values obtained from experiments on an oblique, truncated, pyramid made of aluminum compared well with the theoretical results based on the same structure. </p> / Thesis / Master of Engineering (MEngr)

Yes / In this paper, a simple folded loop antenna (FLA) for handsets with relatively wide- band impedance, designed and optimized using genetic algorithms (GA). The FLA dimensions were optimized and evaluated using GA in collaboration with NEC-2 source code. Configuration of optimal FLA with excellent VSWR covering entirely the required GSM1800 frequency bands was found within the maximum generation. A prototype antenna was tested to verify and validate the GA-optimized antenna structure. The measured data have shown good agreement with predicted ones. Moreover, the capabilities of GA are shown as an e±cient optimisation tool for selecting globally optimal parameters to be used in simulations with an electromagnetic antenna design code, seeking convergence to designated specifications.

Yes / In this paper, a balanced antenna for mobile handset applications with enhanced bandwidth performance, that covers four bands (GSM1800, GSM1900, UMTS and 2.4-GHz WLAN), is investigated. The antenna is a slot planar dipole with folded structure and a dual-arm on each monopole. A wide bandwidth planar balun is employed to feed the wideband balanced antenna from an unbalanced source. A prototype of the proposed antenna is fabricated and tested. The performance of the antenna is veri¯ed and characterized in terms of return loss, radiation patterns and power gain. The calculated and measured results show good agreement and also con¯rm good wideband characteristics for the proposed antenna with multiband operation.

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Ph. D.

A general method of analysis is developed for the solution of single or continuous span folded plate surfaces, with general end conditions, for any load. By considering the folded plate surface as a single, longitudinal unit throughout the analysis, the continuity of the surface is maintained over transverse supports, Within the limitations of the assumptions, this method yields an "exact" solution of the structural action based upon a difference technique in which the surface is divided into : segments: combatibility of the surface is insured at the center of each finite segment along the span and over the supports. A computer program for the analysis of simply supported, © single-span and continuous-span folded plate surfaces, with and without overhangs at each end, under three load conditions is described. A comparison is made between this general method of analysis and presently accepted techniques; and a final solution for a continuous folded plate surface is presented. The results of an experimental investigation to study the behavior of four different folded plate structures and to verify the general method of analysis are discussed. / Ph. D.

Concrete folded plate structures have gained increasing use and popularity in the United States during the past fifteen years. They have proved to be especially economical in the construction of longspan roof systems. The folded plate shape has come into wide use because of its low coat of construction for long spans, high load carrying capacity, and rigidity. Moreover, the folded plate structure hu the structural advantage of thin shelled, curved surface structures, and is much easier and less expensive to construct than the latter. With reference to folded plate structures continuous over a support, the problem arises of relating the geometry of the folded plates to a number of points along the entire length of the plate edges, in an attempt to find the true condition of stress at these points, and to find the contribution of each stress condition to the overall effect. The investigation of this thesis consists of analyzing a reinforced folded plate concrete roof, continuous with overhang. The method of analysis used is that of successive iteration, i.e. balancing angle changes against internal moments and/or stresses. This method is similar to one presented by Howard Simpson - “Design of Folded Plate Roofs” - in the ASCE Proceedings, Vol. 84, January, 1958, but extended to apply to the cantilevered folded plates. / Master of Science

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