Architecture for Cooperative Prefetching in P2P Video-on- Demand System

Most P2P VoD schemes focused on service architectures and overlays optimization without considering segments rarity and the performance of prefetching strategies. As a result, they cannot better support VCRoriented service in heterogeneous environment having clients using free VCR controls. Despite the remarkable popularity in VoD systems, there exist no prior work that studies the performance gap between different prefetching strategies. In this paper, we analyze and understand the performance of different prefetching strategies. Our analytical characterization brings us not only a better understanding of several fundamental tradeoffs in prefetching strategies, but also important insights on the design of P2P VoD system. On the basis of this analysis, we finally proposed a cooperative prefetching strategy called "cooching". In this strategy, the requested segments in VCR interactivities are prefetched into session beforehand using the information collected through gossips. We evaluate our strategy through extensive simulations. The results indicate that the proposed strategy outperforms the existing prefetching mechanisms.Comment: 13 Pages, IJCN

Willingness to communicate in relation to language use among Pakistani undergraduates: A sociocultural perspective

This study aimed to investigate English as a second language (ESL) undergraduates’ sociocultural perspective of willingness to communicate (WTC) in English inside the classroom in relation to language use outside the classroom. The participants were 440 ESL undergraduates selected through the cluster sampling method from eight universities in Khyber Pakhtunkhwa Province in Pakistan. The data were collected through questionnaires on WTC in English inside the classroom and language use outside the classroom. The findings revealed that the participants’ level of WTC in English was high for most social interactions within the classroom, such as in groups, during activities, with the same gender, and when given preparation time in groups. The findings for language use showed that a mixture of languages, such as Pashto and Urdu, was predominantly used in the family, neighbourhood and friendship, religion, education, and transaction domains. In contrast, English was primarily used in the mass media and social media domains. Moreover, the findings revealed that WTC in English inside the classroom was positively correlated with social media, mass media, transaction and education domains but negatively correlated with the family domain

Quantum Griffiths Phase in the weak itinerant ferromagnetic alloy Ni1−x_{1-x}Vx_x

We present magnetization ($M$) data of the $d$-metal alloy Ni$_{1-x}$V$_x$ at vanadium concentrations close to $x_c \approx 11.4$ where the onset of long-range ferromagnetic (FM) order is suppressed to zero temperature. Above $x_c$, the temperature ($T$) and magnetic field ($H$) dependencies of the magnetization are best described by simple nonuniversal power laws. The exponents of $M/H \sim T^{-\gamma}$ and $M \sim H^\alpha$ are related by $1-\gamma=\alpha$ for wide temperature ($10K < T \leq 300K$) and field ($H \leq 5T$) ranges. $\gamma$ is strongly $x$ dependent, decreasing from 1 at $x\approx x_c$ to $\gamma < 0.1$ for x=15%. This behavior is not compatible with either classical or quantum critical behavior in a clean 3D FM. Instead it closely follows the predictions for a quantum Griffiths phase associated with a quantum phase transition in a disordered metal. Deviations at the lowest temperatures hint at a freezing of large clusters and the onset of a cluster glass phase, presumably due to RKKY interactions in this alloy.Comment: 4 pages, 4 pdf figures included, final version as published

Signatures of a quantum Griffiths phase in a d-metal alloy close to its ferromagnetic quantum critical point

We report magnetization ($M$) measurements close to the ferromagnetic quantum phase transition of the d-metal alloy Ni$_{1-x}$V$_x$ at a vanadium concentration of $x_c \approx 11.4$. In the diluted regime ($x>x_c$), the temperature ($T$) and magnetic field ($H$) dependencies of the magnetization are characterized by nonuniversal power laws and display $H/T$ scaling in a wide temperature and field range. The exponents vary strongly with $x$ and follow the predictions of a quantum Griffiths phase. We also discuss the deviations and limits of the quantum Griffiths phase as well as the phase boundaries due to bulk and cluster physics.Comment: 4 pages, 5 figures, final version as published in the Strongly Correlated Electron Systems special issue of J. Phys. Condens. Matte

Study Of Inhomogeneous Dielectric Resonators For Linearly Circularly Polarized Microwave Antenna Applications

In the last three decades a huge amount research has been dedicated to homogeneous (single permittivity) dielectric resonators (DRs) with cylindrical, rectangular/square and hemispherical shapes being the center of attention. These DRs have been investigated theoretically, numerically, and experimentally therefore, all the major performance controlling parameters are known for the homogeneous DRs. It well known that a homogenous DR can serve only one purpose at a time i.e. strong coupling to the source and hence narrow impedance bandwidth and vice versa. To overcome these drawbacks of homogenous DRs, in this work inhomogeneous DRs are designed in such a way that the basic geometry of the resonator is maintained so that the available theoretical, numerical and experimental analysis tools can be effectively applied to the proposed inhomogeneous DRs. The inhomogeneities in the resonators are introduced systematically in the azimuth (ϕ) direction so that the electromagnetic field distribution in the resonators remains the same with different range of energy confinement. To validate these ideas three different resonators based on cylindrical dielectric resonator (CDR) and rectangular/square shape resonators are investigated. For inhomogeneous CDR two 90ᴼ pie shape sectors of relatively high permittivity were introduced in the ϕ-direction in a way that sectors with same permittivity are placed in the opposite quadrant. Similarly, another inhomogeneous DR (split-oval shape) was designed by inserting high permittivity rectangular strip in the middle of two half cylindrical DR in the ϕ direction. Lastly, the third design of this research is based on a square shape DR in which the permittivity is lowered by introducing air-gap within the resonator which appears like a nested square DR. The proposed inhomogeneous DRs are tested for linearly polarized (LP) wideband antenna applications with a common excitation technique i.e. microstrip line. While, for circularly polarized (CP) designs, it is important to excite two orthogonal modes with the same amplitude hence different feeding techniques are used. Theoretical, numerical and experimental analysis of the inhomogeneous dielectric resonator antennas (DRA) showed that by properly designing inhomogeneous resonators, impedance bandwidth response, axial ratio (AR) bandwidth, gain and efficiency of the DRA‘s can be improved. For all three inhomogeneous LP DRA‘s approximately 56% impedance bandwidth was achieved which shows 80.5% enhancement of bandwidth over homogeneous DRAs with stable radiation characteristics throughout the operating band. The AR bandwidth response of the CP inhomogeneous DRA‘s was recorded to be 200% more than that of homogeneous counterparts. For the first two inhomogeneous DRAs gain was improved up to 6.5 dBi while for the nested square DR gain remained almost the same as that of the homogeneous square DR. With reference to these findings it was found that performance of the DRA can be noticeably improved with systematic introduction of inhomogeneity in the DR

Fumigant Toxicity of Ricinuscommunis L.Oilon Adults and Larva of Some Stored Product Insects

In this study fumigant toxicity of castor oil on adults and larva of two stored product insectsTriboliumconfusumand  Trogonellagranarium was investigated.Three concentrations were prepared 2%,5% and10% respectively by using acetone,statistical analysis showed thathightest  mortality  for adults of  T.confusum were 23.333% and 26.666% at 2% and 10% of castor oil and all three concentrations  significantly caused high mortality but 10% of castor oil killed 100% of khaprabeetles.Results also showed that 5% and 10%concentrations of castor oil were the most effective  on  first , second and third larval instars of T.confusum, as they caused 60% and 66.6% mortality for the first larval instar,  50% and 63.3%  mortality for second larval instar and, 33.3% and 40%  for third larval instar  at 5% and 10% concentration respectively compared with 0% at control treatment,in addition the three concentrations of castor oil affected first ,second and third larval instars of T. granarium significantly ,the percentage of mortality was  86.6%, 90.0% and 93.3% for the first laval instar compared with 40.0% at control treatment, 70.0%,70.0% and 80.0% for second larval instars compared with 20% at control treatment,and 40.0%, 63.3% and 80.0% for third larval instar compared with 20.0% at control treatment, at 2%,5% and 10% concentrations respectively.In summary, results indicated that these essential oils have good fumigant toxicity on stored-product pests. Keywords:essentialoiles,castoroil,stored product insects

Management of the Surabaya Syariah Namira Hotel in the Perspective of Sharia Hotel Principles and Regulation of the Minister of Tourism and Creative Economy of the Republic of Indonesia Number 2 of 2014

This research is a field research to highlight service of the Surabaya Syariah Namira Hotel in the perspective of sharia hotel principles and Regulation of the Minister of Tourism and Creative Economy of the Republic of Indonesia Number 2 of 2014. To elaborate on that theme, there are two core issues that will be answered, namely: how is the management of the Surabaya Syariah Namira Hotel? And how is the management of the Surabaya Syariah Namira Hotel in the perspective of Sharia principles and the Regulation of the Minister of Tourism and Creative Economy of the Republic of Indonesia Number 2 of 2014? The data obtained through observation, interview and documentation. The results showed that the service and management of the Surabaya Syariah Namira Hotel is carried out in accordance with the internal hotel regulations and completed with facilities as required in sharia hotel. While based on sharia principles and the Regulation of the Minister of Tourism and Creative Economy of the Republic of Indonesia Number 2 of 2014, the Surabaya Syariah Namira Hotel is adequate to be classified as sharia hotel and as the Hilāl-1 category

Kemitraan Nazhir dengan Bank Syariah dalam Mengembangkan Wakaf Uang : Studi Perbandingan di Indonesia, Bangladesh dan Yordania

Islamic bank as a fnancial institution that manages the already famous and no doubt its existence. Another case when the Islamic bank is associated with the endowment money. Not many people know, and still sparked many questions. This article intends to describe the institutional instrument cash waqf in Islamic banks. In some countries, in developing the waqf money, Nazhir not only work alone. But, he involves the Islamic bank as a strategic partner in the management of waqf money. This is the difference with cash waqf endowments of land, because the money including the type of property that is moving and more easily lost. In fact, the main task is to manage the property Nazhir endowments to be productive, not spend. Therefore, in order waqf money is not slim down, then took Nazhir Islamic bank as a partner in its management. This step has been done in several countries: among them are Indonesia, Bangladesh and Jordan. Difference model of partnership between Nazhir waqf money with Islamic banks in the three countries is what is described in this articl