Cloud Computing, as an emerging, virtual, large-scale distributed computing model, has gained increasing attention these years. Meanwhile it also faces many secure challenges, one of which is authentication. In this paper, we firstly analyze a user authentication framework for cloud computing proposed by Amlan Jyoti Choudhury et al and point out the security attacks existing in the protocol. Th...

The kinetic potential of nucleation theory is used to describe droplet growth processes in a cloud. Drizzle formation is identified as a statistical barrier-crossing phenomenon that transforms cloud droplets to drizzle size with a rate dependent on turbulent diffusion, droplet collection, and size distribution. Steady-state and transient drizzle rates are calculated for typical cloud conditions...

Extensive obscrvations wcre made on airing soundings, as are other characteristic cloud structures. craft flights in the marine layer over the Pacific Ocean From photographs of glories in the stratus tops, angles of off thc coast of southern California. We intcrpret somc of back-scattering can be dctcrmined with sufficient accuracy the cloud patterns as convective and some as gravity wave to id...

Why do some concepts come to be highly popular, significantly reshaping the IT landscape, while others do not? We address this question by exploring the communities of organizations that underlie IT innovation concepts. In an illustrative investigation of the community for cloud computing, we integrate theories of organizational ecology and scale-free network and their associated methods. Subst...

A methodology is proposed for inferring the topology underlying point cloud data directly from point cloud data. The approach employs basic elements of Morse theory, and is capable of producing not only a point estimate of various topological quantities (e.g., genus), but it can also assesses their sampling uncertainty in a probabilistic fashion. Several examples of point cloud data in three di...

cloud point extraction and spectrophotometric determination of trace quantities of cadmium in some vegetables have been developed. the research area for vegetables analysis was near to the zarin shahr where the soil received heavy metals from the esfahan steel company. cloud point extraction used dithizone as complexing agent and non ionic surfactant triton-x114 as micellar phase. several impor...

Raimund Vogl is the project leader of a large-scale project which aims to introduce a university-based cloud storage services to major German universities. The protagonist needs to prepare himself for a meeting with the project sponsors, the Ministry of Science and Research, to convince them to go ahead with the project. The scenario is based on a real case and shows real challenges. The univer...

The paper is devoted to analytical studies of the influence of horizontal inhomogeneity of clouds on their radiative properties in the framework of the asymptotic radiative transfer theory. It is assumed that a cloud field is optically thick. Thus, only overcast cloud fields are under consideration. The study is based on the independent column approximation, assuming Gamma distribution of cloud...