Characteristics of agent-based hierarchical diff-EDF schedulability over heterogeneous real-time Packet networks

Packet networks are currently enabling the integration of heterogeneous traffic with a wide range of characteristics that extend from video traffic with stringent QoS requirements to best-effort traffic requiring no guarantees. QoS guarantees can be provided in packet networks by the use of proper packet scheduling algorithms. In this paper, we propose a new priority assignment scheduling algorithm, Hierarchical Diff-EDF, which can meet the real-time needs while continuing to provide best effort service over heterogeneous network traffic environment. The Hierarchical Diff-EDF service meets the flow miss rate requirements through the combination of single step hierarchal scheduling for the different network flows and the admission control mechanism that detects the overload conditions to adjust packets' priorities. To examine the proposed scheduler, we introduced an attempt to provide an exact analytical solution. The attempt showed that the solution was apparently very complicated due to the high interdependences between the system queues' service. Hence, the use of simulation seems inevitable. A multi-agent simulation that takes the inspiration from object-oriented programming is adopted. The simulation itself is aimed to the construction of a set of elements which, when fully elaborated, define an agent system specification. When evaluating our proposed scheduler, it was extremely obvious that the Hierarchical Diff-EDF scheduler performs over both of the EDF and Diff-EDF schedulers

The Upper Fallujah in the Arabic Islamic Sources

The study of cities can be difficult, especially when considering cities which are built in accordance with the desire of princes and sultans, or those which have been abandoned and become ruins. One example of this is the Upper Fallujah city, part of the chain of urban hubs linking Al-Shaam, Baghdad and the middle and south of Iraq due to its location on the Euphrates river. This helped the Upper Fallujah city to expand and hold a position of importance at key points in different historical eras, stretching from the Babylonian to Islamic periods. This study explores the continued significance of the city, drawing on a range of historical and geographical sources. Keywords: (Anbar,The Upper Fallujah, rapiqum, Ephrata rivek, Arabic Sources)

A linear algebraic approach in analyzing the M/GE/1 and GE/M/1 queuing systems at equilibrium

Uses the algebraic approach in the queuing theory to derive the M/G/1 equilibrium solution for the number of jobs in the system when the probability distribution function representing the general distribution is the generalized exponential (GE-type). Similarly the GE/M/1 system is solved. Furthermore, it has been shown that as expected the solutions are equivalent to the maximum entropy solutions of the M/G/1 and G/M/1 systems respectively at equilibrium

Automated Odour Measurement In Electronic Nose System Using Microcontroller.

This paper presents an automated odour measurement process using AT89C55WD Microcontroller for the electronic nose (e-nose) system

The extent to which the Social Security Institution in Jordan adheres to the requirements of International Accounting Standard No (19) for employee benefits

This study aimed to identify the extent to which the Social Security Institution in Jordan adheres to the requirements of International Accounting Standard No (19) related to employee benefits. The study population included the Social Security Institution in Jordan. As for the sample, it consisted of (78) respondents from financial managers, department heads and their deputies, and accountants working in the financial and accounting departments in the institution. The study found that the institution adheres to the requirements of International Accounting Standard No (19) for short-term and long- term employee benefits, and is also committed to post-service employee benefits and end- of-service benefits. It turned out that the level of this commitment was at a high level. The study recommended the provision of optional and mandatory burdens to the beneficiary within the framework of individual institutions, and the provision of salaries and wages in exchange for performing the service with the associated social and tax burdens

Mechanical properties and shear bond strength of denture teeth to different denture base materials

OBJECTIVES: The aim of this in vitro study is to investigate the mechanical properties and bond strength of denture teeth to recently introduced denture base materials. MATERIALS AND METHODS: From high-impact pourable acrylic HIPA (Dentsply Sirona), DSDM Lucitone 199 puck (Dentsply Sirona), and digitally printed (Dentsply Sirona) denture base materials, bar specimens were fabricated for flexural testing (10 × 3.3 × 64 mm3) and fracture toughness testing (8 × 4 × 39 mm3). Tensile strength specimens were fabricated to form dumbbell-shaped specimens (3 × 6 mm cross-section) with a central bar. Micro-tensile specimens were fabricated into 10 × (1.5 ± 0.2) × (1.5 ± 0.2) mm3 bars. The treated specimens were subjected to thermal cycling. Square plates (3 × 18 mm2) were prepared for bonding to IPN denture teeth rods (3.85 mm) for evaluation of shear bond strength after surface treatment with airborne particle abrasion of 50 m aluminum oxide powder. The means were compared using an ANOVA Tukey HSD test, paired Student’s t-test, and contingency test (α = 0.05). RESULTS: DSDM had statistically higher flexural strength (p < 0.0001) than the other tested materials, as determined by one-way ANOVA. However, all denture base materials’ flexural moduli were not statistically different (p = 0.22). The effect of thermal aging on flexural strength (p = 0.18) and moduli of tested materials (p = 0.83) was not statistically significant. DSDM demonstrated statistically higher fracture toughness values (p = 0.0013) than the other materials. HIPA, however, had statistically higher work of fracture values than the other materials tested (p < 0.0001). The effect of thermal aging on Kmax and fracture work of all tested materials (pooled) was statistically different (p = 0.0002 and p = 0.0132, respectively). DSDP had the statistically highest tensile strength, followed by DSDM, and HIPA had the lowest (p < 0.0001). The effect of thermal aging on tensile strength (pooled) was statistically different (p <0.0001). The HIPA material’s mean micro-tensile strength was significantly lower than the DSDM and DSDP materials (p < 0.0001). Furthermore, the effect of thermal aging on the micro-tensile strength of all tested materials (pooled) was statistically different (p = 0.0005). Each paired Student’s t-test showed that surface abrasion increased the shear bond strength of DSDM, DSDP, and HIPA materials significantly (p < 0.0001, p = 0.0037, and p = 0.0035, respectively). Contingency analysis of the effect of the surface abrasion on each material’s failure mode revealed a 100% adhesive failure mode in DSDM. In DSDP, 5% of the failure mode was mixed. In contrast, the analysis showed 40% cohesive, 50% adhesive, and 10% mixed failure modes in HIPA material, although this finding was not statistically significant (p = 0.32). CONCLUSIONS: DSDM had higher flexural strength than the other tested materials and maximum stress intensity factors. However, HIPA performed better in terms of flexural modulus work of fracture. DSDP material had higher tensile strength values than the other materials. Thermocycling increased flexural strength, modulus values, and fracture toughness values, except for DSDP material which its work of fracture reduced after thermocycling. The tensile strength values of all tested materials was reduced after thermocycling. Air abrasion treatment enhanced the bonding strength between denture teeth and denture base material. Fractographic analysis of fragmented HIPA and DSDM specimens revealed varying degrees of plastic deformation, while DSDP material exhibiting less plastic deformation.  2021-12-13T00:00:00

ASSESSING OF UAE STUDENTS’ INVOLVEMENT IN SCIENCE TEXTBOOK FOR THE 8TH GRADE

The purpose of this research is to identify the level of UAE student involvement in the 8th grade science textbook by reviewing the educational content, graphics, and activities. It was calculated using Romey's Involvement Index, which measures the book involvement factor for the student using a random selection of textbook pages. The findings showed that students’ involvement in the content of science textbook around the minimum value of the acceptable range identified by Romy. The value was at the (0.4) highlighting poor involvement in content that might not allow students to analyse, brainstorm, and draw their own conclusions. A decrease was noticed in students’ involvement in graphics and image and illustrations, (0.14), indicating its poor effect on encouraging students to perform science investigations. It also showed student involvement in activities was (0.31), which is less than the range identified by Romey. Thus, the researchers recommended reviewing the original version of the textbook by the publisher and rewriting the scientific context in an educational format. They also recommended enriching the book with effective content materials, with more attention to image and illustrations and figures, to enhance student opportunities to participate and interact in lessons.  Article visualizations

Incorporating Heuristic Evaluation (HE) in the Evaluation of Visual Design of the Eco-Tourism Smartphone App

Heuristic Evaluation (HE) has proven to be important in the development of different computer systems but has not been incorporated in the development of eco-tourism smartphone applications. This results inusability issues that significantly affect user experience (UX) as discussed in literature. This study reports the HE in the design and development of Niranur Agro Farm (NAF) eco-tourism smartphone applications, which could improve UX. Eight experts participated in this study, utilizing the SMART mobile usability heuristic developed for mobile application and the severity rating scale to determine usability issues. The HE findings indicated that 22 usability issues were identified. One issue was rated 4 (catastrophe), four issues were rated 3 (major problem), twelve issues were rated 2 (minor problem) and five issues were rated 1 (cosmetics). Although there are issues rated as 4 and 3, the majority of the issues were considered to be minor (1 and 2 on the scale). Results indicated that it is crucial to incorporate HE into the design and development of the eco-tourism smartphone app to minimize the usability issues faced by users. It further validated that utilizing a specific heuristic for smartphone applications would ensure that all usability issues are correctly categorized and remedied

Development of Stage – Distance – Discharge Relationship and Rating Curve using Least Square Method

For any river, besides the importance of stage – discharge relationship (rating curve), a stage-discharge- distance relationship is of more significance.  The accurate estimation of both relationships along a river reach is considered a key point for various applications of water resources engineering such as operation and management of water resources projects, designing of hydraulic structures, and sediment analysis.  In this paper, both relationships were established for the Shatt Al – Hillah river reach by applying multiple linear regression and simple linear regression using least square method for determining regression equations. Twelve gauging stations including three primary and nine secondary stations were considered for this method. Moreover, for evaluating the performance of both regressions, statistical measures such as coefficient of determination, root mean square error, mean square error, and Thiel's factor were used. The study results generally indicate a superior performance of both modeling techniques. MLR model was able to predict and mimic the stage-discharge-distance relationship with a coefficient correlation of about 0.932, while SLR model was able to predict three rating curves for the three primary stations with coefficient correlation of about 0.960, 0.943, and 0.924 respectively