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匹配条件: “Dilip Kumar Kalita” ,找到相关结果约21038条。
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Diversity and distribution of spiders from Gibbon Wildlife Sanctuary, Assam, India
Phalgun Chetia,Dilip Kumar Kalita
Asian Journal of Conservation Biology , 2012,
Abstract: The study describes the identification of the spider assemblages with respect to their diversity and distribution in the semi evergreen forest, Gibbon Wildlife Sanctuary, Assam, India. The paper aims to introduce this neglected Order- Araneae which is primarily unknown to Science particularly in Northeast India. A total of 95 species of spiders belonging to 56 genera and 18 families were recorded during the study from June-August and October-December, 2011. The species were identified using keys for Indian spiders from (Tikader, 1987; Platnick , 2011). Methodology included active searching at all layers from ground level to tree canopy layer accessible easily for hand collecting and visual surveys. This is the first attempt to report the spider assemblages and their microhabitat preferences from Assam, India. Such surveys are vital for conservation of these creatures and building a biodiversity database of this mega diverse group from a fragmented semi-evergreen forest ecosystem in Assam, India. This study is focused on the neglected diversity of spider fauna representing this semi evergreen forest.
A New Algorithm of Self Organization in Wireless Sensor Network  [PDF]
Hemanta Kumar KALITA, Avijit KAR
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.21006
Abstract: Self organization is one of the most important characteristics in an Ad-hoc Sensor Network. Thousands of Sensors are deployed in a geographical area randomly without considering the location factor. After deployment, sensors are to self organize themselves to form a network of their own. How well the network is formed determines the life of the whole network as well as the quality of data transmission. Self organization based on clustering has proven to be very useful in this regard. Since hierarchical clustering reduces energy consumption by routing data from one node to another. In this paper, we discuss a new algorithm for self organization of sensors deployed in a geographical area. The algorithm forms clusters of sensors by ordering them using a unique triangulation method. This algorithm not only considers all sensors but also groups them so that their inherent clustering property is preserved.
Testing the Long-Memory Features in Return and Volatility of NSE Index  [PDF]
Naseem Ahamed, Mamoni Kalita, Aviral Kumar Tiwari
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.53050
Abstract: Long-term memory of stock markets is a topic that has not received its due attention from academics. Posting the assertion made by Fama, 1970 [1] about markets being efficient, no one can consistently outrun it for a longer duration. Handful of papers checked the efficiency in emerging markets to see if the efficiency proposition held true. Furthering the literature in this study we test for the long-term memory of National Stock Exchange (NSE) index, Nifty and NSE_500 which are a collection of 50 and 500 listed firms respectively in India. The duration of the data for study is roughly eight years over the period from 2006-06-29 to 2012-09-13, a total of 1545 observations. We observe that long-term memory does exist in the context of Indian stock market index.
A Novel Energy-Efficient Multihop Communication Protocol (EEMCP) for Clustered Heterogeneous Wireless Sensor Networks
Dilip Kumar
Journal of Global Research in Computer Science , 2010,
Abstract: Research on heterogeneous Wireless Sensor Networks (WSNs) has been studied and employed in many new applications viz., medical monitoring, automotive safety, agriculture precision and many more. In this paper, a novel energy efficient multihop communication protocol (EEMCP) for clustered heterogeneous WSNs has proposed to analyze the network lifetime and stability. EEMCP consider heterogeneous nodes with different initial energy levels and adopt multihop communication approach for data communication from cluster heads to the base station. Simulation results show that EEMCP extends the network lifetime and stability by balancing energy consumption of the network.
On Detecting Sudden Changes in the Unconditional Volatility of a Time Series  [PDF]
Dilip Kumar
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.62028
Abstract: The present study highlights the drawback of using Sanso, Arago and Carrion’s (2004) AIT-ICSS algorithm in detecting sudden changes in the unconditional volatility when long memory is present in volatility. Simulation experiments show that the AIT-ICSS test is severely oversized and exhibits low power when long memory is present in volatility.
Weighted Bootstrap Approach for the Variance Ratio Tests: A Test of Market Efficiency  [PDF]
Dilip Kumar
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.63048
Abstract: By means of Monte Carlo experiments using the weighted bootstrap, we evaluate the size and power properties in small samples of Chow and Denning’s [1] multiple variance ratio test and the automatic variance ratio test of Choi [2]. Our results indicate that the weighted bootstrap tests exhibit desirable size properties and substantially higher power than corresponding conventional tests.
On Volatility Transmission from Crude Oil to Agricultural Commodities  [PDF]
Dilip Kumar
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.72009
Abstract: The paper examines volatility transmission from crude oil market to agricultural commodities like wheat, corn, cotton and soybeans. We find that the volatility transmission from crude oil to agricultural commodities exhibits sudden changes over a study period. We also examine whether the sudden changes in volatility influence the observed sudden changes in volatility transmission from crude oil to agricultural commodities. Our results indicate the observed sudden change in volatility transmission mechanism is not influenced by sudden changes in volatility series.
A New Algorithm for End to End Security of Data in a Secure Self Organized Wireless Sensor Network
Hemanta Kumar Kalita
Journal of Global Research in Computer Science , 2010,
Abstract: We consider a self-organized wireless sensor network where sensor nodes are multi-hop away from base station. This means data communication happens through several intermediate nodes before it reaches the base station from source. End to end security of data ensures data sent from the source to destination through several intermediate nodes preserve confidentiality, integrity, authentication and non-repudiation of data. Due to resource-constrained sensor nodes it was considered that implementing confidentiality, integrity, authentication and non repudiation of data using public key infrastructure based scheme would be a challenge in Wireless Sensor Network. Consequently we have seen a lot of secure data communication schemes based on symmetric key in the literature. Although symmetric key based schemes are easy to implement, yet it has a single point of failure, i.e. the key. If a nodes key falls in the hand of attacker, then the whole network is compromised. In this paper we propose a secure data communication scheme for wireless sensor network. Our scheme takes advantage of both asymmetric and symmetric key based schemes and preserves confidentiality, integrity, authentication and non-repudiation of data.
Semileptonic Decay of Bc Meson into S Wave Charmonium in a QCD Potential Model with Coulombic Part as Perturbation  [PDF]
Krishna Kingkar Pathak, Dilip Kumar Choudhury
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.38107
Abstract: We present the semileptonic decay of Bc meson in a QCD potential model with the coulombic part of the Cornell potential -4αs/3r+br+c as perturbation. Computing the slope and curvature of Isgur Wise function in this approach, we study the pseudoscalar and vector form factors for the transition of Bc meson to its S wave charmonium states. Numerical estimates of widths for the transitions of Bc→J|ψ(ηc)lv1 are presented.
Analytical Solution to the One-Dimensional Advection-Diffusion Equation with Temporally Dependent Coefficients  [PDF]
Dilip Kumar Jaiswal, Atul Kumar, Raja Ram Yadav
Journal of Water Resource and Protection (JWARP) , 2011, DOI: 10.4236/jwarp.2011.31009
Abstract: In a one-dimensional advection-diffusion equation with temporally dependent coefficients three cases may arise: solute dispersion parameter is time dependent while the flow domain transporting the solutes is uniform, the former is uniform and the latter is time dependent and lastly the both parameters are time dependent. In the present work analytical solutions are obtained for the last case, studying the dispersion of continuous input point sources of uniform and increasing nature in an initially solute free semi-infinite domain. The solutions for the first two cases and for uniform dispersion along uniform flow are derived as particular cases. The dispersion parameter is not proportional to the velocity of the flow. The Laplace transformation technique is used. New space and time variables are introduced to get the solutions. The solutions in all possible combinations of increasing/decreasing temporal dependence are compared with each other with the help of graphs. It has been observed that the concentration attenuation with position and time is the fastest in case of decreasing dispersion in accelerating flow field.
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