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Dhananjay Kumar Singh,Jairam Man 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.4
A series of perovskite CaTiO3:Dy3+ nanophosphors have been preparedvia solid state reaction method in order to investigate the structural,spectral and photometric properties. The structural, morphological andspectral properties of prepared nanophosphors were systematicallycharacterized by XRD, FESEM, EDX, Photoluminescence, PL decaytime and UV-Visible spectroscopy. The novel CaTiO3:Dy3+ nanophosphorsexhibited single phase orthorhombic structure with space group Pbnm. The high magnification FESEM images of prepared sample demonstratedthe particle size in the range 220-240 nm. The photoluminescenceproperties of Dy3+ doped CaTiO3 nanophosphors were investigatedthrough excitation, emission spectra and decay time by varying theconcentration of activator (Dy3+). Under the excitation of 386 nm UVlight, Dy3+ activated CaTiO3 nanophosphors exhibited its characteristicexcellent intense emissions in blue and yellow region around thewavelength 484 and 575 nm due to the transition 4F9/2→6H15/2 and 4F9/2→6H13/2 respectively. The photometric parameters such as CIE-coordinate and correlated color temperature (CCT) was alsocalculated. The CIE- coordinate (0.28, 0.32) was found near white light and CCT value was found to be 9222.31 K for optimumcomposition Ca0.96TiO3:0.04Dy3+ which was useful for cold light emission. The affirmative experimental results indicated thatthe prepared nanophosphors could be the favorable candidate for lighting applications.
SINR Pricing in Non Cooperative Power Control Game for Wireless Ad Hoc Networks
( Sanjay Kumar Suman ),( Dhananjay Kumar ),( L. Bhagyalakshmi ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.7
In wireless ad hoc networks the nodes focus on achieving the maximum SINR for efficient data transmission. In order to achieve maximum SINR the nodes culminate in exhausting the battery power for successful transmissions. This in turn affects the successful transmission of the other nodes as the maximum transmission power opted by each node serves as a source of interference for the other nodes in the network. This paper models the choice of power for each node as a non cooperative game where the throughput of the network with respect to the consumption of power is formulated as a utility function. We propose an adaptive pricing scheme that encourages the nodes to use minimum transmission power to achieve target SINR at the Nash equilibrium and improve their net utility in multiuser scenario.
Short Term Spectrum Trading in Future LTE Based Cognitive Radio Systems
( Hiran Kumar Singh ),( Dhananjay Kumar ),( Srilakshmi R ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.1
Market means of spectrum trading have been utilized as a vital method of spectrum sharing and access in future cognitive radio system. In this paper, we consider the spectrum trading with multiple primary carrier providers (PCP) leasing the spectrum to multiple secondary carrier providers (SCP) for a short period of time. Several factors including the price of the resource, duration of leasing, and the spectrum quality guides the proposed model. We formulate three trading policies based on the game theory for dynamic spectrum access in a LTE based cognitive radio system (CRS). In the first, we consider utility function based resource sharing (UFRS) without any knowledge of past transaction. In the second policy, each SCP deals with PCP using a non-cooperative resource sharing (NCRS) method which employs optimal strategy based on reinforcement learning. In variation of second policy, third policy adopts a Nash bargaining while incorporating a recommendation entity in resource sharing (RERS). The simulation results suggest overall increase in throughput while maintaining higher spectrum efficiency and fairness.
Sentiment Analysis Approaches on Different Data set Domain : Survey
Shailendra Kumar Singh,Sanchita Paul,Dhananjay Kumar 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.5
The growth of social website and electronic media contributes vast amount of user generated content such as customer reviews, comments and opinions. Sentiment Analysis term is referred to the extraction of others (speaker or writer) opinion in given source material (text) by using NLP, Linguistic Computation and Text mining. Sentiment classification of product and service reviews and comments has emerged as the most useful application in the area of sentiment analysis. This paper focuses on the comparative study (1997 – 2012) of different sentiment classification techniques performed on different data set domain such as web discourse, reviews and news articles etc. The most popular approaches are Bag of words and feature extraction used by researchers to deal with sentiment analysis of opinion related to movies, electronics, cars, music etc. The sentiment analysis is used by manufacturers, politicians, news groups, and some organization to know the opinions of customer, people, and social website users.
Generalized switched-capacitor multilevel inverter topology with self-balancing capacitors
Jena, Kasinath,Panigrahi, Chinmoy Kumar,Gupta, Krishna Kumar,Kumar, Dhananjay,Dewangan, Niraj Kumar The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.9
This paper presents a switched-capacitor topology with fewer switching components and reduced voltage stresses. The circuit contains eight switches and two capacitors to generate a five-level voltage waveform. This paper provides in-depth descriptions of the structural design, operation, and loss analysis. Inherently self-balanced capacitors are utilized in the proposed topology, which eliminates the need for additional charge balancing circuits and sensors. The control action was implemented using a simple logic-based multicarrier pulse width modulation (PWM) strategy. A brief comparative analysis with state-of-the-art topologies has been presented to demonstrate the merits of the developed topology. Finally, the feasibility and efficacy of the suggested topology have been evaluated using simulation and experimental testing to ensure that it is both feasible and effective.
Point Defect Configurations of Supersaturated Au Atoms Inside Si Nanowires
Oh, Sang Ho,Benthem, Klaus van,Molina, Sergio I.,Borisevich, Albina Y.,Luo, Weidong,Werner, Peter,Zakharov, Nikolai D.,Kumar, Dhananjay,Pantelides, Sokrates T.,Pennycook, Stephen J. American Chemical Society 2008 NANO LETTERS Vol.8 No.4