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Articles by S.S. Alwakeel
Total Records ( 2 ) for S.S. Alwakeel
  S.S. Alwakeel and H.M. Almansour
  The main component in distributed computing is the communication middleware that is used to connect the system’s heterogeneous components and to manage the interactions between these components. In Remote Procedure Call (RPC) middleware, the client uses synchronous methods to communicate with the service provider. Message-Oriented Middleware (MOM) uses messaging to communicate asynchronously between the client and the service provider. In this research, we designed and developed an analytical M/M/1 model with first in first out policy and a priority queuing model for evaluating the performance of MOM and RPC middleware. The models compare the performance of RPC to MOM with priority queuing and analyze the throughput of their communication paradigms. Various input parameters are used to determine the optimal environment setting of the paradigms that achieve the maximum throughput performance. The research results prove that by using MOM with priority queuing, system throughput can be improved. This, in turn, will enhance the performance of many middleware practical applications such as middleware in wireless sensor networks and in applications of middleware for pervasive computing.
  S.S. Alwakeel
  This study was conducted to evaluate the microbial contaminants and presence of toxic heavy metals on some herbal medicines. Twenty-seven samples (3 kg each) of well-known herbs and 5 kinds of henna available in herb markets around Riyadh, Saudi Arabia were collected for microbial and toxic metal contamination. Twenty-one (60%) of the samples showed the presence of fungi. Aspergillus flavus and Aspergillus fumigatus were the most common isolates (9/35, 35%). Astralagus sarcocolla had the highest TPC count; Matricaria chamomilia had the highest total coliform count and fecal coliform count. Two henna samples showed more than 1 ppm lead content. Mercury was the highest in Lepidium sativum, aluminum in Zingiber officinale, calcium in Artemisia herba alba, cadmium in Lepidium sativum, Vigna radiata and Zingiber officinale. Copper was the highest in Cinnamomum zeylanicum, iron in Zingiber officinale, zinc in Salvia officinalis, potassium in Matricaria chamomilia, whereas sodium was the highest in Pimpinella anisum. Microbial determination showed that Bacillus species was seen in 3 (9.7%) of the isolated microorganisms with the predominance of Bacillus cereus (14/31, 45.2%). Other microbial isolates were Aeromonas hydrophilia, Shigella spp., Enterobacter agglomerans, Enterobacter spp., Vibrio fluvialis, Escherichia coli, Pasteurella multocida, Enterobacter cloacae, Staphylococcus hyicus, Staphylococcus epidermidis, Acinetobacter iwoffii and Klebsiella. Tests showed the sensitivity of most isolated bacteria to amoxicillin, gentamicin, imipinem, tobramycin and trimethoprim-sulfamethoxazole.
 
 
 
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