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Search Results: 1 - 10 of 162 matches for " Rehan Akbani "
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Enhancing role-based trust management with a reputation system for MANETs
Akbani Rehan,Korkmaz Turgay
EURASIP Journal on Wireless Communications and Networking , 2011,
Abstract: We start with role-based trust management (RBTM) and address some of the challenges associated with using RBTM in mobile ad hoc networks (MANETs). We then enhance RBTM with reputation systems (RSs), and propose a new hybrid trust management system (HTMS). In HTMS, the privilege level of an entity is determined not only by its role in the system, but also by its reputation score, which in turn is based on its behavior. If a privileged node becomes compromised and conducts several malicious or risky transactions, then its privilege level is quickly reduced to limit its access to resources and minimize the damage it can inflict further. The system uses a global, network-wide perspective to thwart global attacks. Such fine-grained variations of access control and dynamically assigning privilege levels would be very difficult to accomplish manually. We evaluated HTMS by comparing an implementation of it against an ideal response. We show that HTMS performs very close to the ideal if we can accurately estimate the proportion of malicious nodes in the network. We suggest using sampling to estimate this proportion. However, even if this estimate is not accurate, the results are still much better than using RBTM by itself. EDICS: SYS-ARCH; SYS-PROT; FOR-DETE; SYS-INTR.
Bayesian Nonparametric Graph Clustering
Sayantan Banerjee,Rehan Akbani,Veerabhadran Baladandayuthapani
Statistics , 2015,
Abstract: We present clustering methods for multivariate data exploiting the underlying geometry of the graphical structure between variables. As opposed to standard approaches that assume known graph structures, we first estimate the edge structure of the unknown graph using Bayesian neighborhood selection approaches, wherein we account for the uncertainty of graphical structure learning through model-averaged estimates of the suitable parameters. Subsequently, we develop a nonparametric graph clustering model on the lower dimensional projections of the graph based on Laplacian embeddings using Dirichlet process mixture models. In contrast to standard algorithmic approaches, this fully probabilistic approach allows incorporation of uncertainty in estimation and inference for both graph structure learning and clustering. More importantly, we formalize the arguments for Laplacian embeddings as suitable projections for graph clustering by providing theoretical support for the consistency of the eigenspace of the estimated graph Laplacians. We develop fast computational algorithms that allow our methods to scale to large number of nodes. Through extensive simulations we compare our clustering performance with standard clustering methods. We apply our methods to a novel pan-cancer proteomic data set, and evaluate protein networks and clusters across multiple different cancer types.
Adult Occupational Sensorineural Hearing Loss: Aids and Assistive Devices
Rehan A.
Indian Journal of Occupational and Environmental Medicine , 2003,
Origin and Development of Human Rights in Islam and the West: A Comparative Study
Sadia Rehan
International Journal of Social Science and Humanity , 2013, DOI: 10.7763/ijssh.2013.v3.189
Abstract: Human rights are the most complicated issue and challenge for the twenty first century. Islam has granted some fundamental rights for the whole humanity, without any discrimination that needs be practiced under all situations. The West claimed to be the founder of human rights due to which the people of the world are blessed with all human rights, otherwise they were steeped in ignorance. The question arisesare human rights absolute and bestowed on men by God or they are caused by the development of society or created by the society itself? Basically to answer this question, the present research is conducted by making a comparative study of the human rights granted by Almighty Allah in the Holy Quran and contemporary human rights practiced in the west. The objective of this study is to explore the origin and development of Human rights in Islam and West. After detailed study it is clear that Islam has laid down a comprehensive charter of universal fundamental rights for humanity fourteen hundred years ago. This charter granted a very noteworthy profound declaration of rights. Furthermore it is concluded that there is no substantial difference between some of the fundamental principles set forth in the West and the Islamic precepts, whereas, there is difference in their approaches. On the basis of research it is concluded that the inherent dignity of man and his fundamental freedom tracing its origin back to God or divine inspiration.
Surgical voice restoration following total laryngectomy
Kazi Rehan
Journal of Cancer Research and Therapeutics , 2007,
Seroprevalence of Dengue Virus IgG among Children 1 - 15 Years, Selected from an Urban Population in Karachi, Pakistan: Population Based Study  [PDF]
Shakeel Ahmed, Syed Rehan Ali, Farhana Tabassum
Open Journal of Pediatrics (OJPed) , 2015, DOI: 10.4236/ojped.2015.52019

Objectives: This was to estimate the proportion of Dengue virus specific IgG ELISA among asymptomatic children between the ages of 1 year to 15 years, residing in an urban population of Karachi. Design: Cross-sectional study. Settings: Subjects were selected from Garden, Karachi; an urban area located adjacent to the Central district of Karachi. Participants: Children of ages 1 year to 15 years, of either sex, residing in the urban area of Garden, Karachi for more than 1 year were selected for the study. Those with a history of yellow fever or using corticosteroids within 1 month of recruitment were excluded. Outcome measures: Data were collected on socioeconomic status of households, medical history, including previous dengue infection, general examination findings and anthropometric indices. Blood samples were collected and sent to Research Laboratories, AKU for determining complete blood counts and serum IgG antibodies for Dengue. All collected information was then analyzed for ascertaining the predicting factors for positive IgG among children less than 15 years. Results: From a total of 900 subjects, 46% were found to have positive IgG in their bloods. Our results revealed that a male child of age more than 10 years was more likely to be IgG positive. Other risk factors identified with the seropositivity included lower household income and absence of anemia, thrombocytopenia and lack of hand washing. Conclusions: The study indicated a significant proportion of children under 15-year-old infected with Dengue virus, with a potential risk of severe complications, if re-infected with dengue. Stringent measures are still needed by both public and private authorities to contain dengue outbreaks, and reducing the proportion of associated mortality, as seen in the previous years. Trial registration: Seed Money Grant (ID# SM090101) was awarded to the corresponding author by Research Committee, Faculty of Health Sciences, Aga Khan University, Pakistan.

Study on the Estrous Cycle Regularity of Cryopreserved Rat Ovarian Tissues after Heterotopic Transplantation  [PDF]
Rumana Jafarey, Syed Ali Rehan Shah Jaffri
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.65037
Abstract: Objective: To evaluate the re-initiation of ovarian function in cryopreserved ovarian grafts by means of vaginal smear of transplant rats. Methods: A total of 40 SPF-SD female rats (5 - 6 week-old) were randomly divided into three groups (blank control, castration control and transplant group). Ovaries were removed by surgical procedure then after cryopreservation and thawing procedures the ovarian tissues pushed inside the back muscles gap in transplant group. On the first PO day, vaginal smear collection was daily initiated. After 30 days, the PO day when the estrous cycle was re-initiated was considered for analysis as well as the estrous days and the number of estrous cycles. Results: Normal control group had a regular estrous cycle, while the transplant group had an estrous cycle disorder within first 2 weeks and later 2 weeks after the transplantation while the duration of diestrus cycle lasted longer. At the same time, the castration group had lost the normal estrous cycle, keeping continue in the stage of diestrus. Conclusion: In transplanted animals the re-initiated ovarian function can be predicted with alteration between estrous and diestrus phases with predominant estrous irregularity. Moreover, short autotransplanted graft duration needs time to perfuse by new blood vessels and hormone secretions, so could not directly affect its target organs to function properly.
Spectrum of Upper GI Endoscopy in Pediatric Population at a Tertiary Care Centre in Pakistan  [PDF]
Muhammad Rehan Khan, Shakeel Ahmed, Syed Rehan Ali, Prem Kumar Maheshwari, Muhammad Saad Jamal
Open Journal of Pediatrics (OJPed) , 2014, DOI: 10.4236/ojped.2014.43025

Although upper GI endoscopy is considered to be a gold standard in diagnosis of many pediatric gastrointestinal disorders, there is limited data about its utility from developing countries. We carried out this retrospective study at Aga khan University Hospital, Karachi, Pakistan from 2008-2012. During the study period, a total of 200 procedures were performed. Mean age of patients was 8.5 years. 66% of patients received general anesthesia for the procedure. Failure to thrive with suspected coeliac disease was the most common indication for the procedure, seen in 31% of patients. Gastritis was the most common abnormal endoscopic finding, seen in 14.5% of patients. Gastritis was the most common histopathological finding on biopsy, seen in 31% of the patients (n = 62). Findings were consistent with coeliac disease in 18% (n = 36), duodenitis, 10.5% (n = 21) and esophagitis, 4% (n = 8) of patients. No immediate post procedure complication was noted in our study.

Balal Idrees,Rehan Ilyas
Academic Research International , 2012,
Abstract: This study explores the educational environment of students with physical disability. It addresses the experiences of discrimination and stigmatization with physically disable students and the impact of discrimination and stigmatization on their self perception.Purposive sampling was applied as a sampling technique in this research for collecting information from physical disable students. Indepth interviews were administrated to collect the relevant information from the respondents. The result indicates most ofstudents with mobility impairments seemed positive towards life and admitted that general education had promoted their self confidence.
A Survey of Underwater Acoustic Communication and Networking Techniques
Khan Rehan,Gang Qiao
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: The study presents the details of recent developments and innovations in the field of Underwater Acoustic Communication (UWAC) and networking that may be act as a requisite platform for the individuals who want to involve in the research of this emerging field. Ocean exploration/monitoring applications make design of robust UWAC and networking systems more demanding for recent researchers. The main objective of these studies is to establish a standard, low complex and real-time acoustic network having the capabilities to handle the extremely complex and continuously time varying nature of sea. During last decade, major contribution in this field has been carried out; many efficient methodologies and algorithms have also been proposed. In terms of physical layer, coherent MIMO-OFDM based communication is considered as feasible solution for the band limited/frequency selective underwater channel with more spectral efficiency, high data rates and reliable links. Considering the implications of complicated aquatic channel characteristics (extremely limited bandwidth, noise, Doppler spread, multipath, complex propagation delay), many researchers are also focusing for the developments of effective MAC protocols in terms of capacity and reduced consumption of power. Routing strategies that establish efficient data delivery paths in underwater environment is another demanding requirement. Designing of Transport layer protocol for fluctuated aquatic environment is an open research area.
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