A Study on Hierarchical Model of a Computer Worm Defense System

This research addresses the problem of computer worms in the modern Internet. A worm is similar to a virus. A worm is a self-propagating computer program that is being increasingly and widely used to attack the Internet. It is considered as a sub-class of a virus because it is also capable of spreading from one computer to another. Worms are also computer programs that are capable of replicating copies of themselves via network connections. What makes it different however is that unlike a computer virus a computer worm can run itself without any human intervention? Because of these two qualities of a worm, it is possible that there will be thousands of worms in a computer even if only one computer worm is transferred. For instance, the worm may send a copy of itself to every person listed in the e-mail address book. The worm sent may then send a copy of itself to every person who is listed in the address book of the person who receives the email. Because this may go on ad infinitum worms can not only cause damage to a single computer and to other persons computer but it can only affect the functionality of Web servers and network servers to the point that they can no longer function efficiently. One example is the .blaster worm

Effect of screentime in college students during the COVID-19 online classes on their neck posture and postural control: an observational study

Background: Corona virus which is the source of severe acute pulmonary syndrome causes an airway tract contamination (COVID 19). Prolonged sitting for online classes in the college students leads to the enlarged postural deviation, increased low back pain. Prolonged static contraction of skeletal muscles of the cervical region, lower back leads to impaired flow of blood to the muscle groups together with edema and accumulation of waste metabolites will trigger the muscle spasm. Methods: Total 30 college students aged between 18-25 years who attended the online classes during COVID-19 were included in this study by using a questionnaire. The outcome measures used were the measurement of CV angle, SEBT and BBS. The postural control was estimated by using star excursion balance test and Berg balance scale. Results: Using Karl Pearson’s correlation coefficient, a positive correlation was observed between CV angle and BBS (r = 0.82). Between BMI and CV angle there exists a statistically significant negative correlation (r = -0.564). Conclusions: This study proved that there exists a forward neck posture in the students who attended the online classes during the COVID-19 pandemic and that also affected their postural control

Economic Determinants of Capital Flight in Jordan: An Empirical Study

The aim of this study is to estimate the constraints of Capital Flight during the period from 2000 to 2013. The statistical analysis showed a positive statistical significant relationship between the external public debt, taxes, economic openness, previous capital flight, and Capital flight in Jordan. However, it also showed a negative statistical significant relationship between the growth rate of the economy and capital flight. This was together with the most important recommendations of the need to monitor the flight of capital through creating a Department in the central bank to control money flight. Therefore, this was aimed in reducing the external public debts that increase the phenomenon of Capital flight and cooperate with international institutions and the United Nations to locate the place of money flight

A research-based approach to promote the adoption of novel UK-based concrete test methods in Chinese construction standards

As part of a UK-China Science Bridge project – a UK government funded initiative linking leading universities and businesses in selective partnering countries – in 2009 a collaborative research programme was initiated between Queen’s University Belfast and the Research Institute of High Performance Concrete (part of the Central Research Institute of Building and Construction) in Beijing.The focus of research was concrete permeability assessment; a key factor in determining the potential long-term durability of civil engineering infrastructure. More specifically, a programme of work was designed to allow comparisons between the related test method included in the Chinese construction standards (GB/T50082-2009) and a novel non-destructive test method, the Autoclam Permeability System, developed by researchers at Queen’s University allowing both laboratory- and site-based measurement of air permeability, unsaturated water permeability and water absorption.A programme of 14 concrete mixtures was investigated to assess the influence of water-binder ratio (in the range 0.36-0.60) and binder type (considered was cement, fly ash, slag and silica fume). All mixes were prepared and tested in China using local materials and assessed for slump and compressive strength, in addition to a suite of durability-related parameters using Chinese and UK test methods. Reported in the paper are the positive correlation coefficients attained between the various test methods and on-going work to secure adoption of the Autoclam test method in China

Applying Architectural Analysis for Current Software Systems: A Case Study of KFC and Pizza Hut Online Food Ordering Systems in Malaysia

The main aim of this study is to discover the ability in analyzing, criticizing and providing suggestion in improving the selected important properties of a software application using architectural analysis dimensions. The researchers selected KFC and Pizza Hut online food ordering systems in Malaysia for the case study purpose. These two selected systems are critically analyzed using seven architectural dimensions such as goals of analysis, scope of analysis, primary architectural concern being analyzed, level of formality of architectural models, type of analysis, level of automation, system stakeholders who are interested in analysis. The finding suggests that there are some characteristics provided by Pizza Hut system which are better than KFC system. Furthermore, details of the findings and discussion are highlighted from seven different aspects of analysis which have been carefully studied and very well analyzed on two popular online food ordering systems

Incidence of tennis elbow and association of hand grip strength among college students

Background: Lateral epicondylitis is an overuse injury involving the origin of common extensor tendon at elbow joint. Among the college students there is more complaint on wrist and elbow. Objective was to find out the incidence of tennis elbow & grip strength among the students during the entire academic year.Methods: Three hundred and seventy subjects fulfilled the inclusion criteria with age respondents between seventeen to twenty four years. This study is done in those students who have local tenderness on palpation over the lateral epicondyle (grade 2). NPRS was used for measuring the pain intensity. Mill’s test and Cozen’s test was performed to confirm the tennis elbow. The subject is asked to squeeze the dynamometer three times with left and right hand respectively. There was one minute resting period between each squeeze were taken into account.Results: The incidence of confirmed tennis elbow was 4.05% & 2.70% in right and left respectively. Among those participants Mill’s test was positive in 16.2% on right and left side and Cozen’s test was positive in 8.1% on right side and 5.4% on left side. The mean rank of left and right grip strength for the students who are confirmed as tennis elbow were 52.75 Kg and 50.67 Kg and for not-confirmed were 36.56 Kg and 36.41 Kg respectively.Conclusions: The study concluded that 6.7% incidence rate of tennis elbow was observed in college students during the entire academic year. And also concluded there is no much significance correlation between grip strength and tennis elbow incidence rate

The performance of concrete exposed to marine environments: predictive modelling and use of laboratory/on site test method

This paper reports an approach by which laboratory based testing and numerical modelling can be combined to predict the long term performance of a range of concretes exposed to marine environments. Firstly, a critical review of the test methods for assessing the chloride penetration resistance of concrete is given. The repeatability of the different test results is also included. In addition to the test methods, a numerical simulation model is used to explore the test data further to obtain long-term chloride ingress trends. The combined use of testing and modelling is validated with the help of long-term chloride ingress data from a North Sea exposure site. In summary, the paper outlines a methodology for determining the long term performance of concrete in marine environments

Development and characterization of a fibroblastic-like cell line from caudal fin of the red-line torpedo, Puntius denisonii (Day) (Teleostei: Cyprinidae)

A fibroblastic-like cell line was established from the ornamental ¢sh, red-line torpedo (Puntius denisonii). The red-line torpedo fin (RTF) cell line is being maintained in Leibovitz’s L-15 mediumsupplementedwith 10% fetal bovine serum (FBS) for over 1year at 28 1C on a continuous basis in normal atmosphere. The growth rate of RTF cells increased as the FBS proportion increased from 5% to 20% at 28 1C with optimum growth at the concentrations of 10% FBS. The morphology of RTF cell was predominantly fibroblastic like. Propagation of these cell lines was serum dependent, with a low plating efficiency (o15%). Karyotyping analysis of RTF cells at the 25th passage indicated that the modal chromosome number was 2n550. The cell line was cryopreserved in liquid nitrogen at �196 1C and could be recovered from storage after 6 months with good cell viability. Polymerase chain reaction amplification of a fragment of two mitochondrial genes, 16S rRNA and CO1, con¢rmed the identity of these cell lines with those reported from this animal species, confirming that the cell lines originated from P. denisonii. The bacterial extracellular products from Vibrio cholerae MTCC3904 and Aeromonas hydrophila were found to be toxic to RTF. The cell lines were not susceptible to viral nervous necrosis virus, a marine ¢sh virus

Investigation of moisture condition and Autoclam sensitivity on air permeability measurements for both normal concrete and high performance concrete

While on site measurement of air permeability provides a useful approach for assessing the likely long term durability of concrete structures, no existing test method is capable of effectively determining the relative permeability of high performance concrete (HPC). Lack of instrument sensitivity and the influence of concrete moisture are proposed as two key reasons for this phenomenon. With limited systematic research carried out in this area to date, the aim if this study was to investigate the influence of instrument sensitivity and moisture condition on air permeability measurements for both normal concrete and HPC. To achieve a range of moisture conditions, samples were dried initially for between one and 5 weeks and then sealed in polythene sheeting and stored in an oven at 50 °C to internally distribute moisture evenly. Moisture distribution was determined throughout using relative humidity probe and electrical resistance measurements. Concrete air permeability was subsequently measured using standardised air permeability (Autoclam) and water penetration (BS EN: 12390-8) tests to assess differences between the HPCs tested in this study. It was found that for both normal and high performance concrete, the influence of moisture on Autoclam air permeability results could be eliminated by pre-drying (50 ± 1 °C, RH 35%) specimens for 3 weeks. While drying for 5 weeks alone was found not to result in uniform internal moisture distributions, this state was achieved by exposing specimens to a further 3 weeks of sealed pre-conditioning at 50 ± 1 °C. While the Autoclam test was not able to accurately identify relative HPC quality due to low sensitivity at associated performance levels, an effective preconditioning procedure to obtain reliable air permeability of HPC concretes was identified