A re-entrant line model for software product testing

In today’s competitive environment for software products, quality is an important characteristic. The development of large-scale software products is a complex and expensive process. Testing plays a very important role in ensuring product quality. Improving the software development process leads to improved product quality. We propose a queueing model based on re-entrant lines to depict the process of software modules undergoing testing/debugging, inspections and code reviews, verification and validation, and quality assurance tests before being accepted for use. Using the re-entrant line model for software testing, bounds on test times are obtained by considering the state transitions for a general class of modules and solving a linear programming model. Scheduling of software modules for tests at each process step yields the constraints for the linear program. The methodology presented is applied to the development of a software system and bounds on test times are obtained. These bounds are used to allocate time for the testing phase of the project and to estimate the release times of software.     

Wireless Sensor Network Based Smart Grid Supported by a Cognitively Driven Load Management Decision Making

Neural Processing Letters - The Smart Grid (SG) provides the bi-directional flow of data to overcome problems like shortage of electricity, electricity billing, managing fault, home automation so...     

On the steady flow produced in fluid-particle suspension by an infinite rotating disk with surface suction

The steady flow of a fluid-particle suspension over an infinite rotating disk with uniform suction is considered. The equations of motion are reduced to ordinary differential equations by similarity transformations and solved numerically by using a least-squares finite-element method. Some typical results for both fluid and particle phases and density distributions of the particles are presented graphically for the suction parameter A = 3.0 in order to illustrate some interesting features of the solutions. It is observed that the radial velocity of the particle attains its maximum on the surface of the disk and the particles slip in the tangential direction on the disk. The magnitudes of the radial velocity components of both the fluid and particle phases are found to decrease rapidly as suction increases.     

Some studies on the warm solid- and hollow-extrusion of sintered powder metallurgical copper preforms

The warm extrusion of sintered P/M preforms of electrolytically pure copper has been investigated for extrusion strains of 0.35, 0.5, 0.66 and 0.81 for the solid configuration and 0.43, 0.62, 0.85 and 1.09 for the tubular configuration at temperatures of 303, 363, 433, 493 and 563 K with densities of 7.45 and 7.90 g cm⁻³ for the solid configuration and 7.0 and 7.7 g cm⁻³ for the tubular configuration. Force requirements and microstructural property evaluation have been attempted. Using the standard axial ring-compression test on the initial preforms, the plastic properties were evaluated to enable the computation of theoretical forces. The actual forces were compared with these theoretical forces and a correction factor, φ, then determined. The influence of strain, temperature and the geometry in ensuring near to theoretical density of the extrudates has been assessed.