The paper presents a useful engineering model for the design of preliminary hybrid rocket engines. This involves experimentally obtained equation regarding speed burning interface between solid fuel and gaseous phase, called regression rate. rate characterizes mass additionally oxidizer through imposed ratio these rates during combustion. is applied to combustion using pure HTPB oxygen was deve...

In a system of regression models, finding feasible shrinkage is demanding since the covariance structure unknown and cannot be ignored. On other hand, specifying sub-space restrictions for adequate vital. This study proposes estimation strategies where restriction obtained from LASSO. Therefore, some LASSO-based Stein-type estimators are introduced, their asymptotic performance studied. Extensi...

Crowdsourcing contests have emerged as an innovative way for firms to solve business problems by acquiring ideas from participants external to the firm. To facilitate such contests a number of crowdsourcing platforms have emerged in recent years. A crowdsourcing platform provides a twosided marketplace with one set of members (seekers) posting tasks, and another set of members (solvers) working...

Regression testing, which attempts to validate modified software and ensure that no new errors are introduced into previously tested code, is used extensively during maintenance of evolving software. Despite efforts to reduce its cost, regression testing remains one of the most expensive activities performed during a software system’s lifetime. Because regression testing is important and expens...