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Policy-Driven Context-Aware Service Composition of Heterogeneous Services in Pervasive Computing Environments

Thesis Info

Access Option

External Link

Author

Mahmoud

Program

PhD

Institute

University of Sindh

City

Jamshoro

Province

Sindh

Country

Pakistan

Thesis Completing Year

2019

Thesis Completion Status

Completed

Subject

Computer Science

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/11831/1/Mahmoud%20mohammad%20ahmad%20Aljawarneh%20Iinformation%20Technology%202019%20uni%20of%20sindh%20prr.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727811533

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Pervasivecomputingoffersenvironmentsinwhichuserneedsortasksarefulfilled without demanding their attention. This requires discovering a service or a set of services based on context (i.e. user presence, user activity, user location, temperature level,lightintensityleveletc.). Anatomicservicemaysometimesmeetthesimpleuser needs but meeting of complex user needs may lead to discovering a number of relevant services and composing them together. While the composed service may well serve userneeds,therecometimeswhenausermaywanttocustomizetheenvironmentbased on her preferences and this require adapting the composed service through parameter adjustment of one of its constituent services or a multiple constituent services. This makescontext-awarenessingeneralandcontextualservicecompositionandadaptation inparticularacorerequirementofpervasivecomputingapplications. Servicesavailable in the environment may be heterogeneous with regard to different discovery protocols (e.g., UPnP, SLP, JINI, etc.) being used fortheirpublication, discovery andinteraction. Context-aware service composition may involve discovery of heterogeneous services andtheadaptationofthecomposedservicemayinvolveinteractingwithheterogeneous constituent services. This raises the issue of service heterogeneity in context-aware service composition and adaptation. We have also proposed an approach following a separation of concerns, which allows adaptation decision logic (adaptation concern), a core part of context-aware applications, to be independently treated and managed as a separate unit of execution from the rest of application code. The proposed approach allows modelling of adaption concerns as declarative Event-Condition-Action (ECA) polices. This allows rapid development of context-aware applications and their dynamic modifiability. Another research issue that we address in this thesis is that of user involvement. Tothisend,wehaveproposedauser-centricapproachthatallowstheusertoparticipate in development of context-aware applications. To address aforementioned research challenges, we have designed and implemented a system whose detailed description is provided in the thesis. The system has been evaluated through usability,performance and scalability measures.
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میجر علی حماد عباسی

پرنس انجم قدر ؍ میجر علی حماد عباسی
آل انڈیا شیعہ کانفرنس کے صدر پرنس انجم قدر کی وفات ملک و ملت کا بڑا حادثہ ہے، سنیوں سے بھی ان کے روابط تھے، وہ دونوں فرقوں میں اتحاد و مفاہمت کے بڑے حامی تھے اور مشترکہ ملی مسائل کے حل کے لیے سنیوں کے ساتھ ہر جدوجہد میں شریک رہتے تھے۔ مسلم پرنسپل لابورڈ، مسلم مجلس مشاورت اور بابری مسجد تحریک سے ان کا گہرا تعلق تھا، دوسرا حادثہ میجر علی حماد عباسی کی اچانک وفات ہے۔ وہ شبلی کالج میں انگریزی کے استاد اور آخر میں پرنسپل ہوئے، پڑھنے لکھنے کا اچھا ذوق تھا اور مشرقی و مغربی ادب پر خاصی نظر تھی۔ وقتاً فوقتاً طنزیہ و مزاحیہ اور ادبی و تنقیدی مضامین لکھتے تھے جن کے بعض مجموعے چھپ گئے ہیں، طالب علمی کے زمانے ہی سے دارالمصنفین برابر آتے تھے جس کا سلسلہ آخر تک قائم رہا۔ پروفیسر مجیب الحسن کی کتاب کشمیر انڈر سلطانز کا اردو ترجمہ ’’کشمیر سلاطین کے عہد میں‘‘ کے نام سے کیا جو دارالمصنفین سے شائع ہوا۔
(ضیاء الدین اصلاحی، ستمبر ۱۹۹۷ء)

 

Penilaian Kesehatan Bank Syariah

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Genetic Diversity and Molecular Basis of Multidrug Resistance in Acinetobacter Baumannii Clinical Isolates

Acinetobacter baumannii is an increasingly important hospital-acquired Gramnegative bacterium that can thrive in the environment of healthcare facilities, and possess a significant public health concern. These features accompanied by its inherent capacity of resistance to antimicrobial agents, acquisition of diverse resistance mechanisms and the aptitude for epidemic spread greatly contribute to the success of A. baumannii as the most important nosocomial pathogen. The main aim of the present study was to investigate the molecular mechanisms underlying the multidrug-resistant phenotypes and the molecular epidemiology of this ignored pathogen of high clinical importance from Pakistan. A total of 319 A. baumannii isolates obtained from various clinical specimens were identified by routine microbiological procedures and further confirmed by multiplex PCR for the amplification of recA gene and internal transcribed spacer (ITS) region along with the amplification of blaOXA-51-like gene. The antimicrobial susceptibility pattern was determined through disc diffusion method and MIC was measured using agar dilution, broth microdilution and E-test® methods. The presence of genes encoding resistance to beta-lactams, 16S rRNA methylases, aminoglycoside modifying enzymes, fluoroquinolones, tetracyclines and sulfonamides were evaluated by PCR followed by sequencing. Repetitive extragenic palindromic PCR (REP-PCR) and multilocus sequence typing (MLST) was performed to investigate the genetic diversity. According to the results, the 96.6% isolates were multidrug-resistant (MDR) and 84.3% were extreme drug-resistant (XDR); 298 (93.4%) were resistant to carbapenems. The blaOXA-51was identified in all A. baumannii strains confirmed by multiplex PCR whereas the acquired blaOXA-23 gene was identified in 284 (89%) isolates. Higher rates of resistance were observed to the extended-spectrum cephalosporins including ceftazidime, cefotaxime, ceftriaxone and cefepime with MIC50 ≥ 128 μg/ml. The blaOXA-23 gene with an upstream ISAba1 was the foremost mechanism of carbapenem resistance that was found in 279 (87.5%) isolates and the blaNDM was found in only 7 strains belonging to a single MLST type. The genes encoding plasmid-mediated quinolone resistant were not detected in any isolate and the mutations in the gyrA and parC genes were the main underlying mechanism responsible for fluoroquinolone resistance. The 209 (65.5%) isolates were resistant to tetracyclines and 94.3% of these isolates were found positive for tetB gene. Among the sulfonamide resistance determinants, sul2 (85.2%) was the most common gene followed by sul1 (32.8%) whereas the combination of sul1 and sul2 genes was detected in 24.6% isolates. All the XIX isolates were found susceptible to polymyxins (polymyxin B and colistin) with MIC50 as 0.5 μg/ml as well as tigecycline with MIC50 (1 μg/ml). On the basis of REP-PCR the indigenous isolates were separated into 8 distant clones whereas MLST demonstrated the presence of seven already reported STs (ST642, ST589, ST2, ST600, ST338, ST103, and ST615) from different parts of world and eight new sequence type that were single or double locus variants to each other. The predominant STs i.e. ST642 and ST589 belonged to clonal complex I according to the Pasteur scheme and were found to harbor blaOXA-23 gene. The overall multidrug resistance was almost common among the isolates of already established STs whereas the isolates belonging to ST338 and the new STs were mainly susceptible. This dichotomy specifies the major selective advantage exerted by the antimicrobial resistance that drives the enduring clonal expansion of multidrug-resistant pathogens. The study revealed the alarming trends of multidrug resistance and substantial genetic diversity among A. baumannii clinical isolates from Pakistan. The differences in the distribution of various antimicrobial resistance mechanisms among various clones demonstrate the capacity of A. baumannii to acquire and express a wider range of resistance determinants. The deeper understanding of the genetic and biochemical basis of antibiotic resistance is of principal importance to design the policies for the effective control of emergence, spread, and development of innovative approaches for the therapeutic management of these multidrug-resistant pathogens.