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Search Results: 1 - 10 of 146151 matches for " Samer F. Said "
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Epidemiology, diagnosis and therapy of Theileria equi infection in Giza, Egypt
Fayez A. Salib,Raouf R.Youssef,Laila G. Rizk,Samer F. Said
Veterinary World , 2013, DOI: 10.5455/vetworld.2013.76-82
Abstract: Aim: To study the prevalence of Theileria equi among horses in different age groups, both sexes, months and seasons of the year, and regions of Giza governourate. Studying the changes in the blood picture, blood chemistries, liver enzymes associate with T.equi infections in horses. Evaluating IFA and CFT at different dilutions in the serodiagnosis of T.equi infections in horses. Evaluating four anti-Theileria medication regimens (diminazine aceturate, imidiocarb 7%, buparvaquone and a combination of imidiocarb 7% and buparvaquone) in treatment of T.equi infections in horses. Materials and Methods: Total of 149 horses were examined by clinical signs and blood smears. Fortey whole blood samples from T.equi infected horses were examined to measure haemoglobin, total RBCs count and PCV. Fortey serum samples from T.equi infected horses were examined to measure total bilirubin, direct bilirubin, ALT and AST enzymes. Serum samples from T.equi infected (40) and non infected (14) horses were tested by indirect fluorescent antibody test (IFA) and complement fixation test (CFT) at different dilutions. Four groups of T.equiinfected horses (A,B,C,D), each group was represented by 10 horses and was separately treated with diminazine aceturate, imidiocarb 7%, buparvaquone and a combination of imidiocarb 7% and buparvaquone respectively. Results: the prevalence of T.equi was 41.61% in totally examined horses. The prevalence was higher in males than females. The highest prevalence was among age group ranged from 5-10 years as (22.81%). The highest prevalence was in July and was recorded as (25.81%) and the disease was more prevalent in summer than winter. The highest prevalence was recorded in Nazlet-alsamman as (51.61%). Equine theileriosis was clinically characterized by fever, haemoglobinuria, oedema, anaemia and icterus. The best dilution for IFA was 1/160 where sensitivity, specificity and accuracy were the highest for this test as (98%), (92.86%) and (97.44%) respectively. The best dilution for CFT was 1/32 where sensitivity, specificity and accuracy were collectively the best as (90%), (92.86%) and (90.74%) respectively. Conclusion: It was concluded that T.equi is prevalent among horses in Giza governourate, its prevalence is varied according to the age, sex of horses, months, seasons and regions. T.equiinfections in horses are accompanied with changes in blood pictures, blood chemistries and liver enzymes. Both IFA and CFT could be used for the serodiagnosis of T.equi . The used four anti-Theileria medication regimens have the same ability to eradicate T.equi fr
Collaboration Schemes Evaluation in Multi-domain Networks
Aymen Belghith,Siwar Ben Hadj Said,Bernard Cousin,Samer Lahoud
International Journal of Computer Science Issues , 2012,
Abstract: The monitoring of the quality of service in a multi-domain network supervises the multi-domain service performance. A multi-domain service is a service that crosses several domains which can be managed by different providers. Since each domain can be managed with its own policies and may require confidentiality of its topology and its monitoring processes, we propose that the monitoring architecture has to be configurable. In this paper, we propose two collaboration schemes that are based on the reactive and the proactive modes. Both of collaboration schemes allow the multi-domain monitoring architecture to select the measurement points that will participate in the multi-domain monitoring and to configure the selected measurement points. In this paper, we present our proposed collaboration schemes and then we evaluate their performance through extensive simulations using Network Simulator (NS-2).
Export Methods in Fault Detection and Localization Mechanisms
Aymen Belghith,Siwar Ben Hadj Said,Bernard Cousin,Samer Lahoud
International Journal of Computer Science Issues , 2012,
Abstract: Monitoring the quality of service in a multi-domain network allows providers to ensure the control of multi-domain service performance. A multi-domain service is a service that crosses multiple domains. In this paper, we propose several mechanisms for fault detection and fault localization. A fault is detected when an end-to-end contract is not respected. Faulty domains are domains that do not fulfill their Quality of Service (QoS) requirements. Our three proposed fault detection and localization mechanisms (FDLM) depend on the export method used. These export methods define how the measurement results are exported for analysis. We consider the periodic export, the triggered export, and a combined method. For each FDLM, we propose two sub-schemes that use different fault detection strategies. In this paper, we describe these mechanisms and evaluate their performance using Network Simulator (NS-2).
Strategic Choice of Market Instrument  [PDF]
Samer Atallah
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.74070
Abstract: This paper proposes a model where both regulator and industry behave strategically to endogenously choose the optimal market instrument. The regulator payoff function includes political gains from investment in abatement and improvement in the provision of the environmental good in addition to the efficient choice of the instrument level. Whereas the industry’s objective is to minimize abatement costs. Under plausible conditions, the model suggests that quantity instrument is favorable to the regulator. Also, industry with high cost of abatement has a better incentive to invest in clean technology. Regulator gains from increasing the provision of environmental good and from industry investing in abatement.
Extended Spectrum -Lactamases among Gram-Negative Bacterial Isolates from Clinical Specimens in Three Major Hospitals in Northern Jordan
Raymond G. Batchoun,Samer F. Swedan,Abdullah M. Shurman
International Journal of Microbiology , 2009, DOI: 10.1155/2009/513874
Abstract: Background and Objectives. Extended spectrum -lactamase (ESBL) production is increasing all over the world, and organisms other than E. coli and K. pneumoniae are acquiring this character. ESBL production is detectable by automation, E-test, double disk diffusion (DDD), and PCR. This study aimed to determine the prevalence of ESBL production among clinical isolates of gram-negative rods, and to evaluate the effectiveness of augmentation of clavunate with Cefotaxime, Ceftazoxime, Aztreonam, Ceftriaxone, and Cefpodoxime in detecting ESBL production. Methods. 472 clinical gram-negative isolates identified by standard methods were tested for ESBL-production by (DDD) method using six cephalosporins and amoxicillin-clavulinate discs. Results. 108/472 (22.9%) of the isolates were ESBL producers, and were prevalent in tertiary care hospitals. 88.2% of E. cloacae, 71.4% of K. pneumoniae, 28.6% of K. oxytoca, 12.5% of C. freundii, 11.1% of A. calcoacceticus, and 10.8% of E. coli were ESBL producers. The DDD test demonstrated some variations in the efficacy of the different cephalosporins in detecting all the ESBL producers. The inclusion of ceftizoxime discs increased the efficacy of the test. It is concluded that ESBL-producing bacteria were prevalent among our hospitalized patients, and involved genera other than Klebsiella and Escherichia, and the inclusion of ceftizoxime increased the efficacy of ESBL detection by the DDD test.
Joint Torque Reduction of a Three Dimensional Redundant Planar Manipulator
Samer Yahya,Mahmoud Moghavvemi,Haider Abbas F. Almurib
Sensors , 2012, DOI: 10.3390/s120606869
Abstract: Research on joint torque reduction in robot manipulators has received considerable attention in recent years. Minimizing the computational complexity of torque optimization and the ability to calculate the magnitude of the joint torque accurately will result in a safe operation without overloading the joint actuators. This paper presents a mechanical design for a three dimensional planar redundant manipulator with the advantage of the reduction in the number of motors needed to control the joint angle, leading to a decrease in the weight of the manipulator. Many efforts have been focused on decreasing the weight of manipulators, such as using lightweight joints design or setting the actuators at the base of the manipulator and using tendons for the transmission of power to these joints. By using the design of this paper, only three motors are needed to control any n degrees of freedom in a three dimensional planar redundant manipulator instead of n motors. Therefore this design is very effective to decrease the weight of the manipulator as well as the number of motors needed to control the manipulator. In this paper, the torque of all the joints are calculated for the proposed manipulator (with three motors) and the conventional three dimensional planar manipulator (with one motor for each degree of freedom) to show the effectiveness of the proposed manipulator for decreasing the weight of the manipulator and minimizing driving joint torques.
Personality Traits and Performance: The Mediating Role of Adaptive Behavior in Call Centers  [PDF]
Said Echchakoui
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.31003

Personality traits and adaptive behavior are central issues in research on call center performance. However, the current literature offers little guidance on the relationship between personality traits and adaptive behavior and how they work together to enhance employee performance. This study investigates the mediating role of adaptive behavior between Five-Factor traits and employee performance with customers. Empirical evidence from a Canadian call center supports this proposition for three Five-Factor traits. Managerial implications are discussed.

Dealing with Model Mis-Specification in the Analysis of Morale in Old Age  [PDF]
Said Shahtahmasebi
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.21008

A major challenge for analysis of data from observational and survey studies is dealing with model mis-specification. A common reason for model mis-specification is the violation of the independence assumption. Model mis-specification is frequently due to the inclusion of variables that are correlated with the error terms (serial correlation) or due to variables omitted from the study. The application of standard regression models to such data could lead to over inflated results, i.e. erroneous results, and misleading conclusions. Longitudinally designed studies make substantial improvements and provide an additional handle to control omitted variables. However, even with longitudinal data, model mis-specification could occur because of the nature of observations, i.e. surveys often include objectively as well as subjectively measured variables. Subjective variables are respon

Fatal septic shock caused by candida myocarditis associated with malignant lymphoma and Epstein-Barr virus mediated disorder  [PDF]
Salah A. M. Said, Bart J. F. Liebrand, Nersing Bansraj, Erik Eijken
Open Journal of Internal Medicine (OJIM) , 2011, DOI: 10.4236/ojim.2011.12007
Abstract: A 60-year-old man with known epilepsy was admitted to our hospital due to hypotension, fever and arrhythmia. He was treated medically and myocardial infarction was ruled out. Treatment of septic shock was established according to the guidelines of the early goal-guided therapy including vasopressors, inotropic agents, mechanical ventilation, and hemofiltration in combination with empirical treatment with antimicrobial drugs and hydrocortisone. The patient’s condition deteriorated rapidly into multiorgan failure resulting in a fatal outcome. Antemortem blood cultures were sterile. Autopsy findings were compatible with Epstein-Barr virus mediated lymphoproliferative disorder, malignant lymphoma, disseminated candidiasis and candida myocarditis. Post-mortem blood and tissue cultures were positive for growth of candida glabrata and candida albicans, respectively. The post-mortem examination documented Epstein-Barr virus mediated lymphoproliferative disorder and malignant small cell lymphoma associated with candida myocarditis. Prior to death, the patient did not receive antiviral or antifungal treatment. Fatal candida myocarditis associated with septic shock secondary to disseminated candidiasis in a 60-years old male patient with prior unknown immune compromised state caused by Epstein-Barr virus mediated lymphoproliferative disorder and malignant lymphoma is described.
Effect of Maclura pomifera total acetonic extract, pomiferin and osajin on the autooxidation of purified sunflower triacylglycerols
Hamed, Said F.,Hussein, Ahmed A.
Grasas y Aceites , 2005,
Abstract: omiferin and osajin have been isolated from the acetonic extract of M. pomifera fruits. Effects of total acetonic extract, pomiferin and osajin on the autooxidation of purified sunflower triacylglycerol were studied. Pomiferin showed a high antioxidant activity whereas total acetonic extract showed moderate and osajin revealed a low activity. Se han aislado la pomiferina y la osajina del extracto de hexano del fruto de M. pomifera. Se han estudiado los efectos sobre la oxidación de triglicéridos purificados del aceite de girasol, del extracto de acetona, de la pomiferina y de la osajina. La pomiferina mostró una actividad antioxidante elevada en cambio, el extracto de acetona mostró una actividad moderada y la osajina baja.
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