This paper proposes the simplification of the synthesis method of PWM pattern by using the Walsh function. The digital nature of the Walsh function makes the relation between the Walsh spectrum and PWM pattern to be a linear algebraic equation. Thus the synthesis becomes straightforward. It is the remarkable feature of the proposed method over a conventional method using Fourier series expansio...

In recent communication systems side lobe level reduction has become one of the important issue. For applications like digital beam forming it is one of the important factor because it reduces the effect of interference arriving outside the main lobe. This reduction in the interference increases the capacity of the communication systems. This paper presents the different methods for reducing th...

We show that a variety of antenna array pattern synthesis problems can be expressed as convex optimization problems, which can be (numerically) solved with great eeciency by recently developed interior-point methods. The synthesis problems involve arrays with arbitrary geometry and element directivity, constraints on far and near eld patterns over narrow or broad frequency bandwidth, and some i...

Optirnized locally exlzaustive test patterti yetietators bused on linear sunis promise a low overhead, bur ha\,e an irregular structure. The puper presents a new 0180t.ithm able to compute the linear sunis fo r real circuiis up to several h i d r e d s of inputs arid outpurs. The idea is to substitute a strategy of introducing fresh variables irito an array of sums fo r the former linear indepe...

Moiré phenomena occur when two or more images are nonlinearly combined to create a new superposition image. Moiré patterns are patterns that do not exist in any of the original images but appear in the superposition image, for example as the result of a multiplicative superposition rule. The topic of moiré pattern synthesis deals with creating images that when superimposed will reveal certain d...

In constructing and visualizing a virtual three-dimensional forest scene, we must first obtain the vegetation distribution, namely, the location of each plant in the forest. Because the forest contains a large number of plants, the distribution of each plant is difficult to obtain from actual measurement methods. Random approaches are used as common solutions to simulate a forest distribution b...

molecular sieves and zeolites are materials whose crystalline frameworks form nanometer or subnanometer pores. a variety of different crystal structures are known having a range of pore sizes. because the pore sizes are usually smaller than 2 nm, they are classified as microporous materials. synthesis of microporous materials is usually conducted by the high temperature treatment (80-200 °c) of...