Effective Cloud-Based Strategies For Managing Online Reputations

Leasing computing resources are now feasible thanks to the Infrastructure as a Service (IaaS) concept made available by cloud computing. In spite of the fact that leased computing resources provide a more financially advantageous answer to the requirements of virtual networks, customers are reluctant to make use of them due to low levels of trust in these resources. Multi-tenancy is a method for reducing operating expenses by allocating a single set of computer resources to serve the needs of several users simultaneously. The fact that computer resources and communication methods are being shared gives rise to concerns over the security and integrity of the data. Since the users are anonymous, it may be difficult for a person to decide who among their neighbours can be trusted. This may make it difficult for an individual to choose a place to live. It is very necessary to have faith in the capacity of the cloud provider (CP) to match customers with dependable co-tenants. Yet, it is in the CP's best interest to make the most of the usage of the resources. So, it enables the maximum possible degree of co-tenancy, which is unaffected by the actions of the user. We provide a powerful reputation management system that pays CPs for discriminating between genuine and malicious users. This prevents resource sharing across CPs in a federated cloud environment, which is one of the goals of our system. Through a combination of theoretical and empirical research, we demonstrate that the proposed method for managing reputations is effective and legitimate

Ceria-supported vinylpyridine polymers: synthesis, characterization and application in catalysis

A simple, one-step synthesis of 4-vinylpyridine polymer crosslinked with 2% divinylbenzene [poly(4vp-dvb)] anchored with ceria nanocrystals via in situ reactions that involve simultaneous formation of the polymer and ceria nanocrystals is presented. The polymer support is formed by free radical suspension polymerization of the monomers, while ceria nanocrystals are generated from CeCl<SUB>3</SUB>·7H<SUB>2</SUB>O by the homogeneous precipitation method in a single pot. The polymer supports were characterized by XRD, TEM, SEM, ESCA, and TGA and then tested for their ability as heterogeneous recyclable catalysts in a Biginelli reaction. The catalytic activities of these supports were found to be far superior to the two-step conventional one and simultaneous microporous bead counterparts. Reusability is an added advantage over the other regularly used cerium-based catalysts in aqueous media. The significant increase in the catalytic activity is due to the higher Ce/N ratio and predominance of well-defined and more reactive exposed planes of ceria nanocrystals on the new supports. Such catalysts are of great importance due to environmental, practical and economical concerns