The networked intrusion detection system virtual appliance (NIDS-VA), also known as virtualized NIDS, plays an important role in the protection and safeguard of IaaS cloud environments. However, it is nontrivial to guarantee both of the performance of NIDS-VA and the resource efficiency of cloud applications because both are sharing computing resources in the same cloud environment. To overcome...

As a thunderstorm approaches a fixed asset (90% of the time) where people are located, VHF cloud lightning mapping provides 10s of minutes of lead time before the first cloud-to-ground strokes reach this asset. At times when a thunderstorm develops directly over the fixed asset (~10% of the time), the cloud flash detection efficiency exceeding 90% maximizes lead time during thunderstorm growth ...

Recomputation of the collision efficiency of nearly equal water drops falling in air gave values which increase as the size ratio approaches uiiity for radii of the bigger drop larger than 6 3 p, and decreased as though tending toward zero for smaller radii. For the bigger radii the new computcd values are consistent with experimental results, but for radii around 40 ,U they are not.

Cloud computing combines the advantages of several computing paradigms and introduces ubiquity in the provisioning of services such as software, platform and infrastructure. Data centers, as the main hosts of cloud computing services, accommodate thousands of high performance servers and high capacity storage units. Offloading the local resources increases the energy consumption of the transpor...

CLOUD computing is a new technique to provide and consume the services based on the Internet, by providing for virtualized resources as a service. This is provided over the network. To protect the privacy of the sensitive data, the data stored in the cloud have to be encrypted before outsourced to the commercial public cloud. In such case, the effective data utilization service is a very challe...

With growing popularity of cloud services, the trend in the industry is to outsource the data to a 3rd party system that provides searching in the data as a service. This approach naturally brings privacy concerns about the (potentially sensitive) data. Recently, quite extensive research of outsourcing classic exact-match or keyword search has been done. However, not much attention has been pai...

The growth of a two-phase cloud of a liquid fuel in a stagnant atmosphere is studied using computational fluid dynamic techniques. In order to predict the danger and hazard of such cloud in open atmosphere it is very important to determine the fuel concentration in the cloud, especially in the far field region from the fuel reservoir. The results show that with omission of droplets break up...

Cloud computing is an “evolving paradigm” that has redefined the way Information Technology based services can be offered. It has changed the model of storing and managing data for scalable, real time, internet based applications and resources satisfying end users’ needs. More and more remote host machines are built for cloud services causing more power dissipation and energy consumption. Over ...

Energy efficiency has become an important managerial variable of IT management. Whereas cloud computing promises significantly higher levels of energy efficiency, it is still not known, if and to what extent outsourcing of software applications to cloud service providers affects the overall energy efficiency. This research is concerned with the allocation of cloud services from providers to cus...