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The performance, dependability, and security of cloud service systems are vital for the ongoing operation, control, and support. Thus, controlled improvement in service requires a comprehensive analysis and systematic identification of the fundamental underlying constituents of cloud using a rigorous discipline. In this paper, we introduce a framework which helps identifying areas for potential cloud...
Data Center (DC) is one of the largest and fastest growing consumers of electricity in the world. In 2013, US DCs consumed an estimated 91 billion kWhr of electricity - enough electricity to power all the households in NY City twice over - and are on-track to reach 140 billion kWhr by 2020 [1]. Paper presents development of ‘Multi-Level Static Synchronous Compensator Inverter’ (MLSTATCOMI) for DC...
The yeast Debaryomyces hansenii which was isolated from saline environments such as sea water, concentrated brines, salty food, is one of the most halotolerant species. It can grow in media containing as high as 4 M NaCl, while the growth of Saccharomyces cerevisiae is limited in media with more than 1.7 M NaCl. This species is very important for food industry as it is used for surface ripening of...
Tea is an economically important plantation crop of many countries of the globe in terms of foreign exchange earnings, employment and revenue generation (1, 2). Since its leaves are rich in polysaccharides, essential oils, vitamins, minerals, purines, flavonoids and alkaloids like caffeine and polyphenols like catechins, it is not surprising that tea is also a popular caffeine containing beverage...
Virtual machines (VMs) are used in cloud computing systems to handle user requests for service. Failure of VMs cause that the user's request not being completed. Replication mechanisms can be used to mitigate the impact of VM failures. In this paper, we are primarily interested in characterizing the failure-recovery behavior of a VM in cloud with different replication schemes. We use a service-oriented...
It is very difficult to estimate the number and location of the operational nodes in underwater network using conventional protocol based techniques due to long propagation delay, strong background noise, non-negligible capture effect, high absorption and dispersion of underwater environment. So, a unique approach based on cross-correlation is applied for underwater network size estimation. In three-sensor...
CP-OCT is a single arm OCT technique which offer significant advantages over dual arm OCT. These techniques are used for presenting a cross sectional view of 3D structure and inner layers of the structure especially turbid in nature. Image processing is a major challenge in OCT instrumentation. This paper focuses on the imaging process on acquired power spectrum of the collected data from a novel...
Defects Per Million (DPM), defined as the number of calls dropped out of a million calls due to failures, is used by the telecommunication systems community as a user-perceived dependability metric. As new standards evolve, with built-in mechanisms to handle and recover from failures, the need for an accurate estimation of metrics like DPM become essential. In this paper, we illustrate the computation...
The rapid growth in cloud service demand has led to the establishment of large-scale virtualized data centers. However data centers consume a large amount of energy resulting in high operating costs and contributing to significant greenhouse gas (GHG) emissions. In cloud computing systems, users' demands are met through deployment of Virtual Machines (VMs) on Physical Machines (PMs). We propose to...
The aim of this work is to discriminate various milk samples using Linear Discrimination Analysis (LDA) detection technique of pure milk, pure milk adulterated with urea, tap water etc. by forming samples phase data into matrix form at different frequencies in Constant phase (property of electrode-electrolyte interface of Polymer coated copper probe dipped in ionic solution) region as well as data...
Virtual machines (VM) are used in cloud computing systems to handle user requests for service. A typical user request goes through several cloud service provider specific processing steps from the instant it is submitted until the service is completed. In the process of providing the service, VM failures cause the user's request to be dropped. To mitigate the adverse impact of VM failure, replication...
In cloud computing systems, users' demands are met through deployment of Virtual Machines (VMs) on Physical Machines (PMs). The rapid growth in cloud service demand has led to the establishment of large-scale virtualized data centers. However data centers consume a large amount of energy resulting in high operating costs and contributing to significant greenhouse gas (GHG) emissions. We propose to...
Solar flares are among the most prominent transient events affecting the radio wave propagation in the ionosphere. In this paper we model the ionizing effect on VLF wave, reflected from D-layer of the ionosphere during different classes of flares and compare with observed VLF modulation. A well known detector simulation software GEANT4 is used to calculate the ionization produced in different heights...
In cloud computing systems, a user request goes through several cloud service provider specific processing steps from the instant it is submitted until the service is completed. In this paper, we use service-oriented metrics to characterize the dependability of cloud computing systems in order to find the pitfalls and improve the service. We find that it is not possible to fully reflect the impact...
In this paper, a tri band butterfly shaped Microstrip feed antenna for 3.852/5.773/8.341GHz application is presented here. The proposed microstrip-fed antenna forms operating frequencies by inserting one pair of slots on the ground plane with same lengths at a same distance from the center symmetrically. The size of the proposed antenna is 20×20 mm. The proposed antenna is simulated by ANSOFT designer...
We have introduced a technique to grow novel optical fiber tip (OFT) which can be widely used in nano-photonics research. It takes help of capillary action and surface tension meniscus of hydrofluoric acid (HF) around the fiber during etching process to grow ultrafine OFT. The optical fiber used has different core material, which is etched at higher rate in HF compared to its cladding. The optical...
A fiber nano-tip is presented as non-plasmonic nanotweezer. The nano-tip, prepared from photosensitive single-mode fiber by chemical etching, generates non-diffracting beam which is used trapping particles of different dimensions and material at smaller laser powers.
VLF propagation effects can be understood using the earth-ionosphere waveguide. However due to emergence of the new fields such as VLF Astronomy where the ionosphere is treated as a giant detector for extraterrestrial energetic phenomena and the seismo-electromagnetism where the disturbances of this giant detector is influenced by terrestrial events, especially earthquakes and other seismic activities...
Solar eclipses provide us with exciting opportunity to study the VLF propagation effects under a controlled experiment in a cosmic scale. During the total eclipse of July 22nd, 2009, we conducted a campaign to obtain the data from more than a dozen places. We observe that in several places the signal amplitude is amplified, while in other places the amplitude is reduced. In yet other places, there...
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