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Scalable Visibility Color Map Construction in Spatial Databases [article]

Farhana Murtaza Choudhury, Mohammed Eunus Ali, Sarah Masud, Suman Nath, Ishat E Rabban
2013 arXiv   pre-print
Recent advances in 3D modeling provide us with real 3D datasets to answer queries, such as "What is the best position for a new billboard?" and "Which hotel room has the best view?" in the presence of obstacles. These applications require measuring and differentiating the visibility of an object (target) from different viewpoints in a dataspace, e.g., a billboard may be seen from two viewpoints but is readable only from the viewpoint closer to the target. In this paper, we formulate the above
more » ... oblem of quantifying the visibility of (from) a target object from (of) the surrounding area with a visibility color map (VCM). A VCM is essentially defined as a surface color map of the space, where each viewpoint of the space is assigned a color value that denotes the visibility measure of the target from that viewpoint. Measuring the visibility of a target even from a single viewpoint is an expensive operation, as we need to consider factors such as distance, angle, and obstacles between the viewpoint and the target. Hence, a straightforward approach to construct the VCM that requires visibility computation for every viewpoint of the surrounding space of the target, is prohibitively expensive in terms of both I/Os and computation, especially for a real dataset comprising of thousands of obstacles. We propose an efficient approach to compute the VCM based on a key property of the human vision that eliminates the necessity of computing the visibility for a large number of viewpoints of the space. To further reduce the computational overhead, we propose two approximations; namely, minimum bounding rectangle and tangential approaches with guaranteed error bounds. Our extensive experiments demonstrate the effectiveness and efficiency of our solutions to construct the VCM for real 2D and 3D datasets.
arXiv:1310.7297v1 fatcat:mbnitmzenzhp7na2yaokg5y55y

VizResearch: Linking the Knowledge of People and the People with Knowledge

Sarah Masud, Monjura Afrin, Farhana Murtaza Choudhury, Syed Ishtiaque Ahmed
2012 Procedia Computer Science  
Access to information and interaction with peers are dominant demands of collaborative research. To provide academicians information regarding research papers, peers and events there are some research information repositories overleaping the need of interaction and collaboration. Although the booming growth of social networking sites has already captured huge audience from academic field, research shows existent Social Networking Services (SNSs) are mostly hedonic thus having a superficial
more » ... ibution to research based interaction. To address this unmet demand, some systems have tailored the concept of SNS to fit research oriented social networking. Though they provide an interactive platform for researchers they lack in information visualization, binding location and time with research and evaluation of research work and related bodies. Hence our solution VizResearch unifies fragmented functionalities across existing platforms and brings all research beneficent features under a single hood.
doi:10.1016/j.procs.2012.04.156 fatcat:7xvfdanovncolldtkg3f2sxnfq

Clinical Characteristics of Measles in Infancy: A Hospital Based Study

Farhana Rahat, MF Abiduzzaman, Ahmed Murtaza Choudhury
2021 Dhaka Shishu (Children) Hospital Journal  
There is a global resurgence of measles among children in recent years and a number of infants are being affected. Objectives: The aim of the study was to determine the frequency of measles in infancy and to describe their clinical characteristics in a tertiary care children hospital. Methods: A prospective observational study was conducted in Dr. MR Khan Shishu Hospital and Institute of Child Health from March, 2019 to February, 2020. The children who came with signs and symptoms of measles,
more » ... ke fever with maculopapular rash associated with cough, runny nose and conjunctivitis were recorded and frequency of measles in infants among hospitalized measles patients was noted. Infants with measles were enrolled for the study and their clinical characteristics, complications and outcome were determined. Data were analyzed by SPSS version 23. Results: A total of 64 infants were studied. The frequency of measles in infants among hospitalized measles patients was 43%. Forty seven percent infants were between 9 to 10 months. Clinical features were typical and all had fever and maculopapular rash. Pneumonia was the main complication and occurred in 50(78%) cases which was followed by oral ulcer 42(66%), diarrhea 26(41%), febrile seizure 9(14%) and croup 5(8%). Thirty four (53%) infant had normal nutritional status. Only 19.51% infant received first dose of measles vaccine. The mortality rate was 2(3%). Conclusion: A number of children are being affected by measles before completing first year of life and they develop complications which are related to morbidity and mortality. So, control and prevention of measles in infancy should give more importance. DS (Child) H J 2020; 36(1) : 20-24
doi:10.3329/dshj.v36i1.52632 fatcat:pc7uky7zcfgehc6qosc73kdkli

Care of Neonates and Children During Corona Crisis and Importance of Continuation of Essential Services

Farhana Rahat, Ahmed Murtaza Choudhury
2022 Dhaka Shishu (Children) Hospital Journal  
The corona virus disease (SARS-CoV-2) has rapidly spread across the world and global population including children are facing unprecedented health crisis. The chance of vertical and perinatal transmission of SARS-CoV-2 virus in children is not proven yet. The effect of the virus on neonate and infant appears to be small. On the other hand, pregnant women suffering from corona virus disease may give birth to premature or IUGR babies who will need extra care. Breast feeding is considered as gold
more » ... tandard in almost all situation. Continuation of breast feeding along with other essential services have reduced the risk of transmission of corona virus. DS (Child) H J 2021; 37(1): 5-8
doi:10.3329/dshj.v37i1.59086 fatcat:d65ooxhksvcxpcjz5h43a66ehy

Usability analysis of e-Governance services in Bangladesh — A survey and future directions

Hasan Shahid Ferdous, Farhana Murtaza Choudhury, Md. Rashidujjaman Rifat, Shubrami Moutushy
2012 2012 15th International Conference on Computer and Information Technology (ICCIT)  
This research addresses the issues affecting e-Governance implementation in Bangladesh in consideration with a detailed usability analysis and directions for future development. Implementing e-Governance has always been a challenge either it is social, economical, or political. Besides this, there are many technological problems, which should be understood and met, so that a user-accepted e-Governance system emerges. This research provides a quantitative investigation of e-Governance
more » ... ion problems with emphasis on analyzing quantitative data gathered in a survey using structured questionnaires that was generated on the basis of our theoretical study. Based on these results we provide a clear conception about those problems, which should be considered at the time of implementing e-Governance services in developing countries like Bangladesh.
doi:10.1109/iccitechn.2012.6509799 fatcat:xxribjj53vdndexppcobefwdzi


2020 2020 IEEE 36th International Conference on Data Engineering (ICDE)  
Shane Culpepper (RMIT University) xvi Mo Li (Northeastern University, China), Farhana Murtaza Choudhury (University of Melbourne, Australia), Renata Borovica-Gajic (University of Melbourne, Australia  ... 
doi:10.1109/icde48307.2020.00004 fatcat:2nmwurfeqbafdn365dtduvpc5a

29th International Conference on Data Engineering [book of abstracts]

2013 2013 IEEE 29th International Conference on Data Engineering Workshops (ICDEW)  
Maximum Visibility Queries in spatial Databases Sarah Masud, Farhana Murtaza Choudhury, Mohammed Eunus Ali (Bangladesh University of Engineering and Technology) Sarana Nutanong (University of Maryland  ... 
doi:10.1109/icdew.2013.6547409 fatcat:wadzpuh3b5htli4mgb4jreoika

The Islamic resurgence: why Bangladesh is a case apart

Moinul Khan
According to Choudhury (1974, p. 40) , although Nazrul was born in a Muslim family, he demonstrated his personal aptitude towards non-communal values.  ...  My wife Farhana Rahman (Tusi) and two beloved little daughters, Joanna Khan and Oydan Khan, offered me personal encouragement and made sacrifices for the timely completion of the thesis.  ... 
doi:10.25949/19432730 fatcat:5r3oecmx3zcb5o7r3k6x6mhjie