Performance of voice over frame relay

Frame Relay (FR) represents one of the most important paradigm shifts in modern telecommunication. This technology is beginning to evolve from data only application to broad spectrum of multimedia users and potential to provide end users with cost effective transport of voice traffic for intra office communication. In this project the recent development in voice communication over Frame relay is investigated. Computer ssimulations were carried out using the powerful simulation software OPNET. Performance measures such as delays, jitter, and throughput are reported. It is evident from the results that real-time voice or video across a frame relay network providing acceptable performance is possible

Response of Eggplant to Integrated Approaches for Sustainable Reclamation and Improvement of a Cheringa Hot Spot of Acid Sulfate Soil

The application of basic slag (BS20 and BS30: basic slag 20 and 30 t ha-1) and aggregate size (A20 and A30: aggregate sizes of soil less than 20 and 20-30 mm) and different techniques (Tech 1: pyrite at top, jarosite at middle, and top soil at the bottom of ridge; Tech 2: top soil at top, pyrite at middle, and jarosite layer at the bottom of ridge) exerted significant (p≤0.05) positive effects on the growth and yield of eggplants cultivated under field condition and the effects varied not only with the kinds and amounts of amending materials but also with the techniques applied. The soil showed a silty clay loam texture, initial pH value of 4.1, pyrite content of 55 g kg-1, base saturation of 47%, ECe value of 3.6 dS m-1, high exchangeable Fe3+ and Al3+ contents of 1.47 and 5.29 cmolc kg-1, respectively. The pH value of the average soil data obtained from all the treatments during fruit set (95 days after transplantation) of eggplants was found to be increased in pH by 1.2 units higher compared with the control (i.e. initial pH value). The contents of P, K, Ca and Mg in the average soil data during fruit set were found to be increased (IOC = increased over control) by 41 to 127% IOC, while the contents of Al3+, Fe3+, Na+, Cl- and SO4 2- in the soil were found to be decreased by 28 to 92% IOC. The different treatments on eggplants grown under the modified-plain-ridge-ditch techniques in the Cheringa acid sulfate soil significantly (0≤0.05) increased the fresh yield of eggplants, and the increment was more pronounced with Tech 2. The maximum yield of 17.8 t ha-1 of eggplant for Tech 1 and 20.1 t ha-1 for Tech 2 were recorded by the application of BS30 in the soils of smaller aggregates (A20) at the ridges of Tech 2, followed by the A30BS30 treatments in both the techniques. The lowest quantity of 1.7 t ha-1 yield was recorded by the control treatment. The eggplants grown in the ridges of both the techniques exhibited the best responses on N, P, K, Ca and Mg contents in eggplant tissues during fruit set. As expected, the lowest contents of these nutrients in the eggplants were recorded in the control treatment. Sulfur content of the eggplants grown in the control plots was 3.6 g kg-1 and was in the range of adequate S content (4 g kg-1). However, the S contents in the eggplants grown in different treatments were significantly (p≤0.01) lower compared with the adequate level. The effectiveness of the treatments for the reclamation of the soil in relation to the growth of eggplants was: Tech 2 > Tech 1, BS30 > BS20, and A20 > A30. The results suggest that the physicochemical properties of the soil, and the growth, yield and nutrition of eggplants were strikingly improved by the application of flash leaching followed by BS30 and A20 treatments in the ridges of Tech 2, and are regarded as the best reclamation measures for this acid sulfate soil

The chiral phase transition and the role of vacuum fluctuations

We investigate the chiral phase transition in the quark-meson effective model using optimised perturbation theory to one loop. Certain terms in the free energy are frequently omitted in calculations, on the assumption that their contribution is negligible. We show that this is not necessarily the case, and that the order of the phase transition, as well as the critical temperature, depends heavily on which contributions are included.Comment: Talk given at the IX International Conference on Quark Confinement and the Hadron Spectrum (QCHS9), Madrid, 2010. 3 pages, 4 figure

Trade, Growth and Povety: A Case of Pakistan

It is generally argued that open trade is crucial for economic growth and development. The economic literature also argues that growth is an important option for reducing poverty in developing countries. The paper analyzed the causality between the trade, growth and poverty for Pakistan using annual time series data from 1973-2009. Granger causality results based on Error-Correction Models have shown that in the case of Pakistan there exists two way relationship between trade and growth in the long-run but for the short-run growth enhance the trade. For the growth and poverty, there exists long-run relation from growth to poverty while for the short-run there exists no relationship. It may be concluded that international trade can play an important role towards growth and ultimately alleviation of poverty. From the policy perspective government should focus on trade.F14; F41; O19; I3.

Using chemometrics in assessing Langat River water quality and designing a cost-effective water sampling strategy

Seasonally dependent water quality data of Langat River was investigated during the period of December 2001 – May 2002, when twenty-four monthly samples were collected from four different plots containing up to 17 stations. For each sample, sixteen physico-chemical parameters were measured in situ. Multivariate treatments using cluster analysis, principal component analysis and factorial design were employed, in which the data were characterised as a function of season and sampling site, thus enabling significant discriminating factors to be discovered. Cluster analysis study based on data which were characterised as a function of sampling sites showed that at a chord distance of 75.25 two clusters are formed. Cluster I consists of 6 samples while Cluster II consists of 18 samples. The sampling plots from which these samples were taken are readily identified and the two clusters are discussed in terms of data variability. In addition, varimax rotations of principal components, which result in varimax factors, were used in interpreting the sources of pollution within the area. The work demonstrates the importance of historical data, if they are available, in planning sampling strategies to achieve desired research objectives, as well as to highlight the possibility of determining the optimum number of sampling stations which in turn would reduce cost and time of sampling

Online assessments: Exploring perspectives of university students

© 2018, The Author(s). The United Arab Emirates is committed to integrating technology into higher education. In this study the researchers aim to explore the perspectives of university students on online assessments. An understanding of students’ views can help identify obstacles and promotors in embracing online assessments at the undergraduate level. The social constructivist epistemology has been used in this qualitative study to understand students’ preferences, apprehensions and acceptance of online assessments. Semi-structured focus group discussions were carried out after recruiting 41 university students, using convenience and snowball sampling methods. Thematic content analysis was applied to the data. This study highlighted that students did not comprehend the need for online assessments. Concerns regarding technological incompetence of students and teachers alongside distrust in the technology infrastructure were stressed. Students felt online assessments were restrictive for the science courses and had resulted in falling grades; probably due to the increasing dependence on multiple choice questions. Students also expressed the importance of constructive, timely and personalized feedback. Students need to be convinced of the usefulness of the transition to online assessment before they agree with it. It is evident through this study that student acceptance would increase with a gradual transition towards online assessments alongside technological training for both students and faculty. Active individualized interaction with instructors is important to students, furthermore preferences and concerns emphasized by students should be addressed to successfully integrate online assessments into higher education

Impact of Supply of Money on Food and General Price Indices: A Case of Pakistan

The paper probed the impact of supply of money on food and general price indices by estimating a series of equations taking CPI food, CPI general, WPI food, WPI general, GDP deflator and SPI as measures of inflation and M1, M2 and M3 supply of money as explanatory variables. For analysis, OLS technique is used covering time series data for the years 1975-76 to 2006-07 that was made stationary by Durbin-Watson criterion. AR (1) is used to check autocorrelation. The results for CPI food, CPI general, WPI general, GDP deflator and SPI show that they are negatively related with M1 supply of money. CPI food, CPI general, WPI general, GDP deflator, and SPI are also negatively related with M2 supply of money. The results show that CPI food, CPI general, WPI general, GDP deflator and SPI are positively related with M3 supply of money. It may be concluded that supply of money M1 and M2 affects the food and general indices in the same way. However, M1 supply of money affects the CPI general strongly than CPI food.Inflation, Money supply, Consumer Price Index, Food prices, Sensitive Price Indicator.

An exploration of the relationship between aphasia therapy, depression and quality of life in post-stroke patients after rehabilitation at 12 and 26 weeks after stroke: A VERSE sub-study

Background: Depression is a common consequence of stroke, and people with aphasia (PWA) post-stroke have a higher risk of developing depression compared to stroke survivors without aphasia. However, current stroke interventions featuring aphasia therapy tend to neglect the effect of the treatment on mood. There is also a lack of evidence on the impact of stroke education and counselling on PWA in early stroke recovery. Additionally, the research on post-stroke depression often excludes or insufficiently describes PWA in study populations. The influence of direct aphasia therapy on depression in PWA is undetermined. This sub-study investigated: i) the effect of aphasia therapy, stroke education and counselling on depression as measured by the Aphasia Depression Rating Scale (ADRS) at 12 and 26 weeks after stroke in people with aphasia; ii) the effect of change in communicative ability on depression and quality of life as measured by the Stroke and Aphasia Quality of Life-39 (SAQoL-39); and iii) the relationship between depression and quality of life at 12 and 26 weeks post-stroke after controlling for covariates mentioned below. Method: The Very Early Rehabilitation of SpeEch (VERSE) trial was a randomized controlled trial that recruited 246 participants within the first 10 days post-stroke and provided them with different regimens of direct aphasia therapy. Education and counselling were provided as part of standard usual care within the trial and the content of these sessions was left to the discretion of the therapist. This sub-study ran linear mixed effects regression models at 12 and 26 weeks using baseline data, the amount of aphasia therapy (hours) and frequency (sessions per week) provided and ADRS and SAQoL-39 scores. The models controlled for age, gender, baseline stroke severity (NIHSS), baseline aphasia severity (Western Aphasia-Battery Aphasia Quotient score) and baseline cognition. Hospital site was included as a random effect in all models. Results: Eighteen models were run. Amount (hours) and frequency of direct aphasia therapy, stroke education and counselling had no significant effect on ADRS scores at 12 and 26 weeks 3 after stroke. The change of AQ scores from baseline to week 12 and from baseline to week 26 did not influence ADRS scores. The difference between AQ scores from baseline to week 12 and from baseline to week 26 was significant in predicting SAQoL-39. ADRS was a significant predictor of SAQoL-39 scores at weeks 12 and 26 after stroke. Conclusion: The amount (hours) and frequency of direct aphasia therapy, stroke education and counselling did not significantly affect the development of depression in this cohort. Change in communicative ability and depression strongly predicted the quality of life for PWA as early as 12 weeks after stroke. There was no evidence that communication-based therapy had an effect on mood. Therapy that merges communicative and psychosocial strategies together could be explored to find a form of treatment that targets language ability and mood for people with early aphasia after stroke. Further research is required for the management of depression for PWA in the early phase of recovery