Although several papers have studied no-idle scheduling problems, they all focus on flow shops, assuming one processor at each working stage. But, companies commonly extend to hybrid flow shops by duplicating machines in parallel in stages. This paper considers the problem of scheduling no-idle hybrid flow shops. A mixed integer linear programming model is first developed to mathematically form...

Whether insights arise consciously or unconsciously, and whether they arise suddenly or gradually, has been the subject of much speculation but little empirical research. Problem solving on the inversion problem presented an unusual opportunity to circumvent the methodological obstacles that have limited progress on these issues. This paper presents both empirical research on how children gener...

What does it take to qualify as a “problem for the twenty-first century?” Obviously, the topic must be of fundamental importance, it must be difficult to solve as manifested by the number of excellent people who have tried—but failed, and non-experts should be able to appreciate the basic issues. The particular problem described here, which involves finding certain geometric configurations that...

The analytic center cutting plane method (ACCPM) is one of successful methods to solve nondifferentiable optimization problems. In this paper ACCPM is used for the first time in the vehicle routing problem with time windows (VRPTW) to accelerate lagrangian relaxation procedure for the problem. At first the basic cutting plane algorithm and its relationship with column generation method is clari...

in this study, the effect of hydrocarbon and rosin ester resins combination on the physical and mechanical properties of thermoplastic road markings were evaluated. at first, two basic thermoplastic road marking formulations based on hydrocarbon and rosin ester resins were prepared. several samples of the blends of two basic formulations for thermoplastic road marking were characterized and com...

Fresh water supply is a basic need of the gas and oil industry Yamal-Gydan region. Small rivers flowing into Ob’ Taz Bay could be used for solving this problem. The purpose study to summarise available research data on runoff small calculate catchment areas using GIS technologies. covers more than 200 in area Bay. It established that there have been no stationary observations them. Expedition d...

A basic interpolation problem, which includes bitangential matrix versions of a number of classical interpolation problems, is formulated and solved. Particular attention is placed on the development of the problem in a natural way and upon the fundamental role played by a special class of reproducing kernel Hilbert spaces of vector-valued meromorphic functions that originate in the work of L. ...

The first-order schemes used for discretisation of the convective terms are straightforward and easy to use, with the drawback of introducing numerical diffusion. Application of the secondorder schemes, such as QUICK scheme, is a treatment to reduce the numerical diffusion, but increasing convergence oscillation is unavoidable. The technique used in this study is a compromise between the above-...