The present paper aims to investigate the effects of modularity and the layout of subsystems and parts of a complex system on its maintainability. For this purpose, four objective functions have been considered simultaneously: I) maximizing the level of accordance between system design and optimum modularity design,II) maximizing the level of accessibility and the maintenance space required,III...

The proposed factorization methods for regular arrays of two-input cells have several important advantages over the existing logic representations and methodologies: (1) The logic representation and design implementation are consistent. (2) The stages of logic synthesis and physical design are effectively merged into a single stage. (3) The structure of the mapping solution is a regular rectang...

| The proposed factorization methods for regular arrays of two-input cells have several important advantages over the existing logic representations and methodologies: (1) The logic representation and design implementation are consistent. (2) The stages of logic synthesis and physical design are eeectively merged into a single stage. (3) The structure of the mapping solution is a regular rectan...

the use of methods employed for estimating the strength and toughness of composites reduces the trial-and-error in their design. the strength of interface between reinforcement and matrix and the effective surface of pulled-out particles have great influences on toughness and strength of these composites. in this study, a model was proposed to estimate the interface strength and matrix strength...

it is well known that the matrix exponential function has practical applications in engineering and applied sciences. in this paper, we present some new explicit identities to the exponential functions of a special class of matrices that are known as central-symmetric $x$-form. for instance, $e^{mathbf{a}t}$, $t^{mathbf{a}}$ and $a^{mathbf{a}t}$ will be evaluated by the new formulas in this par...

Design process is an important stage in product development. Information model is a useful tool in analyzing and improving complex design process. It can facilitate to rebuild the process through visualizing information flow. Owing to the disadvantages of describing complex design process with data flow diagram (DFD), the extended DFD with powerful description ability is put forward. After the ...