OALib Journal期刊

ISSN: 2333-9721



匹配条件: “Sanjit SARKAR” ,找到相关结果约1958条。
Spatial – Temporal Variation of Population Growth and Sustainability of Food Grain Production in West Bengal, India
Sanjit SARKAR,Kasturi MONDAL
Journal of Settlements and Spatial Planning , 2012,
Abstract: This paper examines the dynamics in population growth and sustainability of food grain production in West Bengal. Linkage between population growth and food production is an issue of debate since late eighteen century when Malthus predicted that population growth will outstrip the food supply. Though fertility level in West Bengal reached to bellow replacement (TFR is <2.1) but population will increase till next few decades due to the mechanism of population momentum. Average annual growth rate has declined over the last two decades but absolute growth in the population increases the demand for food. There has been remarkable increase in the food grain production in West Bengal after 1980s but till the current level of food production is not sufficient enough to meet the domestic food requirement, though this gap decreased over the time. Besides, slow growth in the agricultural in the last few years is another concern of sustainable food production. Population growth in the West Bengal has significant association with food grain production and agriculture. Cultivable land and net sown area has reduced significantly due to the rapid growth of population. Cropping intensity increased drastically because of the reduction of net sown area and increase in population. Hence, it is very essential to increase the current level of food production more than proportional of population growth to ensure the food security in the near future in West Bengal.
Vision in Film
Sanjit Bagchi
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.0030249
Telemedicine in Rural India
Sanjit Bagchi
PLOS Medicine , 2006, DOI: 10.1371/journal.pmed.0030082
Vision in Film
Sanjit Bagchi
PLOS Biology , 2005, DOI: 10.1371/journal.pbio.0030249
Perfect Entanglement Transport in Quantum Spin Chain Systems  [PDF]
Sujit Sarkar
Journal of Quantum Information Science (JQIS) , 2011, DOI: 10.4236/jqis.2011.13014
Abstract: We propose a mechanism for perfect entanglement transport in anti-ferromagnetic (AFM) quantum spin chain systems with modulated exchange coupling and also for the modulation of on-site magnetic field. We use the principle of adiabatic quantum pumping process for entanglement transfer in the spin chain systems. We achieve the perfect entanglement transfer over an arbitrarily long distance and a better entanglement transport for longer AFM spin chain system than for the ferromagnetic one. We explain analytically and physically—why the entanglement hops in alternate sites. We find the condition for blocking of entanglement transport even in the perfect pumping situation. Our analytical solution interconnects quantum many body physics and quantum information science.
Bach flows of product manifolds
Sanjit Das,Sayan Kar
Physics , 2010,
Abstract: We investigate various aspects of a geometric flow defined using the Bach tensor. Firstly, using a well-known split of the Bach tensor components for $(2,2)$ unwarped product manifolds, we solve the Bach flow equations for typical examples of product manifolds like $S^2\times S^2$, $R^2\times S^2$. In addition, we obtain the fixed point condition for general $(2,2)$ manifolds and solve it for a restricted case. Next, we consider warped manifolds. For Bach flows on a special class of asymmetrically warped four manifolds, we reduce the flow equations to a first order dynamical system, which is solved exactly to find the flow characteristics. We compare our results for Bach flow with those for Ricci flow and discuss the differences qualitatively. Finally, we conclude by mentioning possible directions for future work.
Sciduction: Combining Induction, Deduction, and Structure for Verification and Synthesis
Sanjit A. Seshia
Computer Science , 2012,
Abstract: Even with impressive advances in automated formal methods, certain problems in system verification and synthesis remain challenging. Examples include the verification of quantitative properties of software involving constraints on timing and energy consumption, and the automatic synthesis of systems from specifications. The major challenges include environment modeling, incompleteness in specifications, and the complexity of underlying decision problems. This position paper proposes sciduction, an approach to tackle these challenges by integrating inductive inference, deductive reasoning, and structure hypotheses. Deductive reasoning, which leads from general rules or concepts to conclusions about specific problem instances, includes techniques such as logical inference and constraint solving. Inductive inference, which generalizes from specific instances to yield a concept, includes algorithmic learning from examples. Structure hypotheses are used to define the class of artifacts, such as invariants or program fragments, generated during verification or synthesis. Sciduction constrains inductive and deductive reasoning using structure hypotheses, and actively combines inductive and deductive reasoning: for instance, deductive techniques generate examples for learning, and inductive reasoning is used to guide the deductive engines. We illustrate this approach with three applications: (i) timing analysis of software; (ii) synthesis of loop-free programs, and (iii) controller synthesis for hybrid systems. Some future applications are also discussed.
Investigating Randomly Generated Adjacency Matrices For Their Use In Modeling Wireless Topologies
Gautam Bhanage,Sanjit Kaul
Computer Science , 2013,
Abstract: Generation of realistic topologies plays an important role in determining the accuracy and validity of simulation studies. This study presents a discussion to justify why, and how often randomly generated adjacency matrices may not not conform to wireless topologies in the physical world. Specifically, it shows through analysis and random trials that, more than 90% of times, a randomly generated adjacency matrix will not conform to a valid wireless topology, when it has more than 3 nodes. By showing that node triplets in the adjacency graph need to adhere to rules of a geometric vector space, the study shows that the number of randomly chosen node triplets failing consistency checks grow at the order of O(base^3), where base is the granularity of the distance metric. Further, the study models and presents a probability estimate with which any randomly generated adjacency matrix would fail realization. This information could be used to design simpler algorithms for generating k-connected wireless topologies.
Adolescents Perception on Environmental Change and Health Risk in Two Divisions of Bangladesh  [PDF]
Gaylan Peyari Tarannum Dana, Sanjit Roy, Md. Rabuil Haque
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.312008
Abstract: Bangladesh is facing and will have to face all the direct and indirect impacts of environmental change because of its geographical position. It is one of the developing countries susceptible to environmental disaster where almost each and every year environmental change is affecting the human health in a multi-dimensional way. The linkages between health and environmental change are mediated by the complex interactions of population, society and environmental systems. The objective of this study was to explore adolescents’ perception on environmental change and health risk in two divisions of Bangladesh. Our analysis is based on quantitative data collection utilizing structured questionnaires. Simple random sampling was used to have a good representation of population. Total sample size of this study was 437. For the analysis of quantitative data both descriptive and inferential statistics were carried out based on the basis of study objectives. Most of the respondents (98.3%) stated that environmental change is causing serious health problems in Bangladesh. Majority respondents in Dhaka division perceived that there is an increase in the number of diseases during the summer and respondents in Rajshahi division perceived that number of diseases occur in all three seasons. The study observed that high level of awareness programmes will help to increase the success of different programmes initiated by the government to prevent diseases related to environmental change. Adolescents are aware about the environmental change that is taking place and causing health problems. The most influential factor on such awareness was the excess to receive information those who have information everyday had more knowledge about environmental change and its impact on health. Therefore to increase the knowledge and perception of health problems related to environmental change we need to arrange awareness programme, ensure excess to information and more research in this area.
SWATI: Synthesizing Wordlengths Automatically Using Testing and Induction
Susmit Jha,Sanjit A. Seshia
Computer Science , 2013,
Abstract: In this paper, we present an automated technique SWATI: Synthesizing Wordlengths Automatically Using Testing and Induction, which uses a combination of Nelder-Mead optimization based testing, and induction from examples to automatically synthesize optimal fixedpoint implementation of numerical routines. The design of numerical software is commonly done using floating-point arithmetic in design-environments such as Matlab. However, these designs are often implemented using fixed-point arithmetic for speed and efficiency reasons especially in embedded systems. The fixed-point implementation reduces implementation cost, provides better performance, and reduces power consumption. The conversion from floating-point designs to fixed-point code is subject to two opposing constraints: (i) the word-width of fixed-point types must be minimized, and (ii) the outputs of the fixed-point program must be accurate. In this paper, we propose a new solution to this problem. Our technique takes the floating-point program, specified accuracy and an implementation cost model and provides the fixed-point program with specified accuracy and optimal implementation cost. We demonstrate the effectiveness of our approach on a set of examples from the domain of automated control, robotics and digital signal processing.

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