National Institute of Technology, Karnataka

About: National Institute of Technology, Karnataka is a education organization based out in Mangalore, Karnataka, India. It is known for research contribution in the topics: Corrosion & Cloud computing. The organization has 5017 authors who have published 7057 publications receiving 70367 citations.

Bat algorithm for scheduling workflow applications in cloud

Abstract: Workflow is one of the important aspects of cloud computing today. Cloud computing is one of the fastest growing technologies in the world. Workflows can be used in cloud as we use them in grid. Many operations in the cloud are based on workflow execution. Workflow systems are now becoming more complex and for such kind of systems efficient workflow management is important. Workflow scheduling is an important part of workflow management. Scheduling in general is NP-hard problem. To solve such kind of problems exhaustive methods cannot be used. Only non-exhaustive techniques can be used. In this paper we have used a metaheuristic approach called bat algorithm. Bat algorithm is specifically designed for optimizing hard problems. Here, bat algorithm with the help of binary bat algorithm is used for scheduling workflow in a cloud. Specifically the mapping of tasks and resources is done using this method. The optimal resources are selected such that the overall cost of the workflow is minimal.

Novel RGO-ZnWO4-Fe3O4 Nanocomposite as an Efficient Catalyst for Rapid Reduction of 4-Nitrophenol to 4-Aminophenol

Abstract: We report herein a simple, economic, and facile approach for the synthesis of a novel reduced graphene oxide-zinc tungstate-iron oxide (RGO-ZnWO4-Fe3O4) nanocomposite by a one-pot microwave method and its efficiency as a catalyst in reducing 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) using sodium borohydride (NaBH4). The as-prepared RGO-ZnWO4-Fe3O4 nanocomposites were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Fourier transformed infrared spectroscopy (FTIR), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) techniques. The prepared nanocomposites showed excellent catalytic performance in the reduction of 4-NP to 4-AP. The reaction was completed in just 40 s at room temperature. The RGO in RGO-ZnWO4-Fe3O4 nanocomposite plays an essential role to improve the catalytic performance through facilitation of easy electron transfer and high adsorption of the substrate on graphene sheets. The synergistic eff...