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Search Results: 1 - 10 of 21001 matches for " Dhiraj Kumar "
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Unraveling the Design Principle for Motif Organization in Signaling Networks
Samrat Chatterjee, Dhiraj Kumar
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0028606
Abstract: Cellular signaling networks display complex architecture. Defining the design principle of this architecture is crucial for our understanding of various biological processes. Using a mathematical model for three-node feed-forward loops, we identify that the organization of motifs in specific manner within the network serves as an important regulator of signal processing. Further, incorporating a systemic stochastic perturbation to the model we could propose a possible design principle, for higher-order organization of motifs into larger networks in order to achieve specific biological output. The design principle was then verified in a large, complex human cancer signaling network. Further analysis permitted us to classify signaling nodes of the network into robust and vulnerable nodes as a result of higher order motif organization. We show that distribution of these nodes within the network at strategic locations then provides for the range of features displayed by the signaling network.
Web Crawler: A Review
Dhiraj Khurana,Satish Kumar
International Journal of Computer Science and Management Studies , 2012,
Abstract: In a large distributed system like the Web, users find resources by following hypertext links from one document to another. When the system is small and its resources share the same fundamental purpose, users can find resources of interest with relative ease.However, with the Web now encompassing millions of sites with many different purposes, navigation is difficult. WebCrawler, the Web’s first comprehensive full-text search engine, is a tool that assists users in their Web navigation by automating the task of linktraversal, creating a searchable index of the web, and fulfilling searchers’ queries from the index. Conceptually, WebCrawler is a node in the Web graph that contains links to many sites on the net, shortening the path between users and their destinations.
An Improved Approach for Caption Based Image Web Crawler
Dhiraj Khurana,Satish Kumar
International Journal of Computer Science and Management Studies , 2012,
Abstract: The World Wide Web [1] is a global, read-write information space. Text documents, images, multimedia and many other items of information, referred to as resources, are identified by short,unique, global identifiers called Uniform Resource Identifiers so that each can be found, accessed and cross referenced in the simplest possible way. It is a vast reservoir of information provides an unrestricted access to large inexhaustible pool of information, present in the form of hypertext documents formattedusing Hyper Text Markup Language (HTML). These documents contain hyperlinks to other documents.
Changes in the halo formation rates due to features in the primordial spectrum
Dhiraj Kumar Hazra
Physics , 2012, DOI: 10.1088/1475-7516/2013/03/003
Abstract: Features in the primordial scalar power spectrum provide a possible roadway to describe the outliers at the low multipoles in the WMAP data. Apart from the CMB angular power spectrum, these features can also alter the matter power spectrum and, thereby, the formation of the large scale structure. Carrying out a complete numerical analysis, we investigate the effects of primordial features on the formation rates of the halos. We consider a few different inflationary models that lead to features in the scalar power spectrum and an improved fit to the CMB data, and analyze the corresponding imprints on the formation of halos. Performing a Markov Chain Monte Carlo analysis with the WMAP seven year data and the SDSS halo power spectrum from LRG DR7 for the models of our interest, we arrive at the parameter space of the models allowed by the data. We illustrate that, inflationary potentials, such as the quadratic potential with sinusoidal modulations and the axion monodromy model, which generate certain repeated, oscillatory features in the inflationary perturbation spectrum, do not induce a substantial difference in the number density of halos at their best fit values, when compared with, say, a nearly scale invariant spectrum as is generated by the standard quadratic potential. However, we find that the number density and the formation rates of halos change by about 13-22% for halo masses ranging over 10^4-10^14 solar mass, for potential parameters that lie within 2-sigma around the best fit values arrived at from the aforesaid joint constraints. We briefly discuss the implications of our results.
An Energy Efficient Time Synchronization Algorithm for Wireless Sensor Networks
Kavi Kumar Khedo,Dhiraj Lobin
International Journal of Advanced Research in Computer Science , 2010,
Abstract: High precision and real-time communications are increasingly becoming important in Wireless Sensor Networks as such networks are required to support highly time-critical applications. The sensor nodes need to communicate data to each other at the correct time. However, the clocks of sensor nodes run at different speed and very often drift from the real time value. In this paper we are proposing EETS, an energy efficient time synchronization algorithm. Energy efficiency is achieved by synchronizing only nodes that are communicating with each other when an event occurs. EETS is performed in two phases namely the Level discovery phase and the Synchronization phase. A simulation study has been carried out and the results shows that EETS is more energy efficient than other existing algorithms. Particularly, EETS has been compared to Network Wide Time Synchronization (NWTS) which is a widely used algorithm for time synchronization in WSN. Simulation results have shown that NWTS uses about 10% more energy than EETS. NWTS synchronizes 90% of the network nodes but reduces the lifetime of the network considerably while EETS synchronizes only nodes that need to be synchronized and thus saving energy
Confronting the concordance model of cosmology with Planck data
Dhiraj Kumar Hazra,Arman Shafieloo
Physics , 2014, DOI: 10.1088/1475-7516/2014/01/043
Abstract: We confront the concordance (standard) model of cosmology, the spatially flat $\Lambda$CDM Universe with power-law form of the primordial spectrum with Planck CMB angular power spectrum data searching for possible smooth deviations beyond the flexibility of the standard model. The departure from the concordance cosmology is modeled in the context of Crossing statistic and statistical significance of this deviation is used as a measure to test the consistency of the standard model to the Planck data. Derived Crossing functions suggest the presence of some broad features in angular spectrum beyond the expectations of the concordance model. Our results indicate that the concordance model of cosmology is consistent to the Planck data only at 2 to 3$\sigma$ confidence level if we allow smooth deviations from the angular power spectrum given by the concordance model. This might be due to random fluctuations or may hint towards smooth features in the primordial spectrum or departure from another aspect of the standard model. Best fit Crossing functions indicate that there are lack of power in the data at both low-$\ell$ and high-$\ell$ with respect to the concordance model. This hints that we may need some modifications in the foreground modeling to resolve the significant inconsistency at high-$\ell$. However, presence of some systematics at high-$\ell$ might be another reason for the deviation we found in our analysis.
Test of consistency between Planck and WMAP
Dhiraj Kumar Hazra,Arman Shafieloo
Physics , 2013, DOI: 10.1103/PhysRevD.89.043004
Abstract: Within the context of the concordance model of cosmology we test the consistency of the angular power spectrum data from WMAP and Planck looking for possible systematics. The best fit concordance model to each observation is used as a mean function along with a Crossing function with an orthogonal basis to fit the data from the other observation searching for any possible deviation. We report that allowing an overall amplitude shift in the observed angular power spectra of the two observations, the best fit mean function from Planck data is consistent with WMAP 9 year data but the best fit mean function generated from WMAP-9 data is not consistent with Planck data at the $3\sigma$ level. This is an expected result when there is no clear systematic/tension between two observations and one of them has a considerably higher precision. We conclude that there is no clear tension between Planck and WMAP 9 year angular power spectrum data from a statistical point of view (allowing the overall amplitude shift). Our result highlights the fact that while the angular power spectrum from cosmic microwave background observations is a function of various cosmological parameters, comparing individual parameters might be misleading in the presence of cosmographic degeneracies. Another main result of our analysis is the importance of the overall amplitudes of the observed spectra from Planck and WMAP observations. Fixing the amplitudes at their reported values results in an unresolvable tension between the two observations at more than $3\sigma$ level which can be a hint towards a serious systematic.
Prevalence and Antibiotic Resistance Pattern among the Mastitis Causing Microorganisms  [PDF]
Karanvir Singh, Mudit Chandra, Gurpreet Kaur, Deepti Narang, Dhiraj Kumar Gupta
Open Journal of Veterinary Medicine (OJVM) , 2018, DOI: 10.4236/ojvm.2018.84007
Abstract: Mastitis is one of the most commonly occurring diseases of dairy animals. It is the most important cause of economic losses to the dairy industry in India and throughout the world. In the present study prevalence of microorganisms isolated from mastitic milk and their antibiotic resistance was studied. A total of sixty nine milk samples from mastitic animals (clinical and subclinical) were tested using sodium lauryl sulphate test and those positive were selected and transported to the laboratory for isolation and identification of the causative agent. Out of these samples fifty samples yielded bacterial growth when tested on selective/non selective medium. Of these fifty samples, seven samples had single bacterial growth whereas rest of the 43 samples had mixed growth. Among the bacterial isolates it was found that the highest prevalence was of Streptococcus agalactiae and Staphylococcus aureus followed by E. coli and Klebsiella pneumoniae. Antibiotic sensitivity test revealed that Streptococcus agalactiae revealed the highest sensitivity to ofloxacin, ciprofloxacin, gentamicin and resistance to amoxicillin and doxycycline; Staphylococcus aureus revealed the highest sensitivity to ciprofloxacin, doxycycline, azithromycin and sparfloxacin and resistance to amoxycillin and gentamicin. Similarly, E. coli revealed the highest sensitivity to azithromycin and chloramphenicol and resistance to amoxicillin and teicoplanin, and Klebsiella pneumoniae revealed highest sensitivity to azithromycin, gentamicin and resistance to amoxicillin, teicoplanin and erythromycin. Thus, from the present study it could be concluded that Streptococcus agalactiae, Staphylococcus aureus, E. coli and Klebsiella pneumoniae were the most frequently isolated organisms from mastitic animals and azithromycin and the third generation fluoroquinolones (ciprofloxacin, sparfloxacin and ofloxacin) were the most sensitive drugs.
Determination and Analysis of Sidebands in FM Signals using Bessel Function
Dhiraj Saxena,Mridul Kumar Mathur,Seema Loonker
International Journal of Electronics and Computer Science Engineering , 2012,
Abstract: In Frequency Modulation the components of the modulated wave are much more complex in comparison to other analog modulation techniques. Here a single frequency modulating signal produces an infinite number of pairs of sidebands frequencies. However the sideband frequencies are negligibly small in andwidth of the FM signal. An exact analysis of these sidebands is essential so as to find the exact bandwidth in order to overcome the problems of overlapping of adjacent signals and ons in order to determine the amplitudes of the available sidebands and thereby the bandwidth. We find that larger the value of modulation index, more sets of sideband frequencies is produced.
Library, Democracy And Sustainable Development: The Role Of Public Libraries In India
Ziaur Rahman , Dhiraj Kumar Basak And Sabahat Nausheen
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: Free and open libraries are vital to the success of democracy. Public libraries do play an important role inour society. Libraries collect organize, preserve and provide access to knowledge and information. The publiclibrary system is perhaps one institution that can be readily associated with the social function of providing areservoir of the true reflection of the diversity of human knowledge. They preserve valuable record of culture thatcan be passed down to succeeding generations. They provide people with access to information they need to work,play, learn and govern. It is an essential part of sustainable development. Strategies for sustainable developmentmust include the democratization process. They help to bring people into the democratic process and keep theminformed as citizens about the actions of their representatives.The democratic order is therefore tasked with the empowerment of individuals and communities in orderto create a climate conducive to sustainable development. The public library system is envisaged as a sure means ofachieving these noble objectives—the citizenry must be provided with a continuous access to information whichwill guide them through and where necessary to translate that information into action. This paper recognizes thecentral role played by the public library system in most democracies and advocated that the status of the publiclibrary system should be upgrading to a national agency. The plight of the public library system is that there are noclear and committed legislation on the part of the federal government in respect of its establishment and funding. Itis this one singular predicament that has blighted the progress and contribution of the public library system tosustainable development. This paper looks at the role public libraries play in promoting democracy throughproviding free and open libraries, literacy and reading promotion, information and intellectual freedom.
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