Defence Scientific Information and Documentation Center

Delhi, India

Defence Scientific Information and Documentation Center

Delhi, India
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Sachdev P.,Devi Ahilya University | Banerjee M.,Devi Ahilya University | Mukherjee G.S.,Defence Scientific Information and Documentation Center
Defence Science Journal | Year: 2014

In this paper, we report the embedment of Cobalt (Co) nanoparticles by ion beam sputtering (IBS) in poly(vinyl alcohol) (PVA) substrate to prepare nanocomposite film. The Co film of 5 nm was deposited on PVA by IBS technique. Formation of nanocrystalline Co with hcp phase is revealed in GIXRD pattern of the film which also indicates that there is no change in the crystalline structure of PVA even after sputtering of the metallic nanoparticles. The average particle size of Co nanoparticles as evaluated using Scherer formula is found to be about 2 nm. UVVis absorption spectrum of the film showed SPR peaks of Co metal in their nano size level embedded in the PVA matrix system. XPS study confirms the metallic nature of Co MOKE studies show that the nanocomposite film is ferromagnetic with Hc of. 42.8 Oe. © 2014, DESIDOC.

Renu,Defence Scientific Information and Documentation Center | Ravi,Guru Gobind Singh Indraprastha University | Ratan R.,Scientific Analysis Group
Advances in Intelligent Systems and Computing | Year: 2014

Current communication systems are very efficient and being used conveniently for secure exchange of vital information. These communication systems may be misused by adversaries and antisocial elements by capturing our vital information. Mostly, the information is being transmitted in the form of plain English text apart from securing it by encryption. To avoid losses due to leakage of vital information, one should not transmit his vital information in plain form. For monitoring of huge traffic, we require an efficient plain English text identifier. The identification of short messages in which words are written in short by ignoring some letters as in mobile messages is also required to monitor. We propose an efficient plain English text identifier based on Fuzzy measures utilizing percentage frequencies of most frequent letters and least frequent letters as features and triangular Fuzzy membership function. Presented method identifies plain English text correctly even, the given text is decimated/discontinuous and its length is very short, and seems very useful. © Springer India 2014.

Kumar A.,Defence Scientific Information and Documentation Center | Bansal A.,Defence Scientific Information and Documentation Center | Kanungo P.D.,Defence Scientific Information and Documentation Center
Annals of Library and Information Studies | Year: 2014

The article gives an historical account of the DESIDOC Journal of Library and Information Technology. It highlights that from a humble beginning as a newsletter, it has gone on to become one of India's leading journal in the field of library and information science. © 2014, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.

Nisha F.,Defence Scientific Information and Documentation Center | Senthil V.,Defence Scientific Information and Documentation Center | Bakhshi S.I.,University of Delhi
2015 4th International Symposium on Emerging Trends and Technologies in Libraries and Information Services, ETTLIS 2015 - Proceedings | Year: 2015

With the advent of Internet and new technologies variety of information sources are coming up. The thirst of information in R&D activities has become ever growing and ever demanding. The information is becoming more digital and people are getting easy access to abundant information which leads to the temptation of using and copying it and stealing other ideas without knowing the implications and without acknowledging the original contributor in completion of their research and projects. The act of stealing original work without acknowledging its author/contributor is plagiarism that has become an accelerating issue in this era of Information & Communication Technology. This paper provides an overview about plagiarism, plagiarism in research, and various commercial and free plagiarism detection tools available. Further the paper presents the latest plagiarism cases reported from India and abroad and initiatives taken by academic and research institutes in India to detect and prevent plagiarism. © 2015 IEEE.

Pant A.,Defence Scientific Information and Documentation Center
Electronic Library | Year: 2015

Purpose - The paper aims to evaluate the usability of the website of Central Science Library (CSL), University of Delhi. Multi-method approach of evaluation is used with the use of standard checklist and questionnaire survey of representative users. Besides, the information architecture of the website under study is analysed in this paper. Design/methodology/approach - Based on the literature review and the author's experience, a usability assessment tool for library websites was developed by Pant (2013). It comprises standard checklist and questionnaire for users' survey. In the present study, this framework was used to assess the usability of CSL website. The questionnaire survey of 35 representative users was conducted through random sampling. The results of both methods (standard checklist and questionnaire survey) were analysed for evaluating the website usability. Findings - Need for improvement of the website was realised in terms of efficiency, effectiveness and learnability for better usability. Notice board, site search facility, list of services, FAQs and user guides were the most sought after features among others as per the analysis of the questionnaire survey. Besides, the need to enhance the visual appeal of the website was felt. However, information resources provided through the CSL website were found useful for users. Originality/value - The paper presents an innovative multi-method approach of website usability assessment while considering six usability attributes: Usefulness, Efficiency, Effectiveness, Learnability, Satisfaction and Accessibility. The approach adopted in this paper is cost effective in comparison to formal usability tests and heuristic evaluation. Therefore, this framework is suitable for libraries having limited budget to ensure the user-centred library website with maximum usability. This paper encourages other libraries to conduct similar website usability evaluation to identify the usability problem areas and users' perception for their respective website. © 2015 Emerald Group Publishing Limited.

Moorthy A.L.,Defence Scientific Information and Documentation Center | Pant A.,Defence Scientific Information and Documentation Center
Annals of Library and Information Studies | Year: 2012

Resource sharing amongst libraries is a good old practice that is aimed at overcoming budgetary constraints. The new millennium saw quite a few number of Library Consortia established in the country, NKRC of CSIR and INDEST being the most successful of them. After taking in to consideration the experiences of these and other Library Consortia that are successfully serving their users, DRDO E-Journals Consortium was established by DESIDOC in the year 2009 with 7 core publishers. This paper briefly discusses the genesis of the DRDO Consortium, its services, budgetary provisions, services offered, and efforts made by DESIDOC to enhance the use of e-resources across the Organisation. An analytical study of the usage of e-resources by the DRDO scientific community was also made and the inferences were listed. Overall the Consortium has been perceived as a major facilitator in providing required information within least possible time.

Arti M.K.,Northern India Engineering College | Jindal S.K.,Defence Scientific Information and Documentation Center
IEEE Transactions on Vehicular Technology | Year: 2016

In this paper, we study the transmission of orthogonal space-time block codes (OSTBCs) over a shadowed Rician (SR) land mobile satellite (LMS) link. Specifically, we derive the symbol error rate (SER), diversity order, and the average capacity of the OSTBC-transmission-based scheme over the SR fading LMS communication systems. First, we consider the independent and identically distributed (i.i.d.) SR fading channels and derive the expressions of moment-generating function (mgf) in terms of the Meijer-G function. By substituting the Meijer-G function in terms of hypergeometric function and then by considering the asymptotic approximation of hypergeometric function, the analytical diversity order of the scheme is obtained. The ergodic capacity of the scheme is derived by using the mgf-based approach. The effect of elevation angles over the SER performance of the scheme is analyzed, and it is observed that the performance of the system is improved with increasing values of elevation angles. Next, we consider the OSTBC transmission over correlated SR fading channels and derive the expressions of mgf, SER, diversity order, and average capacity of the considered setup. In particular, it is demonstrated in this paper that, by employing an additional transmit antenna at the satellite along with Alamouti code, the error rate of the LMS communication system can be significantly improved. It is also shown that the correlation has no impact on the diversity order of the system, but it adversely affects the capacity of the system. © 2016 IEEE.

Jindal S.,University of Delhi | Pant A.,Defence Scientific Information and Documentation Center
Electronic Library | Year: 2013

Purpose - The purpose of this paper is to determine whether a sufficient number of e-books is available in science streams from different publishers to satisfy the need of an academic library to develop an e-book collection based on its collection development policy. This study aims to identify e-book equivalents for print books acquired by Central Science Library, University of Delhi. Design/methodology/approach - This study provides the in-depth quantitative analysis according to title-by-title selection of e-books from various international publishers compared to the recommended books for different science courses of the University of Delhi. The study was conducted following that of Price and McDonald which shows that around 30 per cent of print books have e-book equivalents. The data collected were analyzed by using a simple method of calculation and percentages were calculated to interpret the results of the study. Findings - The results show that only about 17per cent of print books have e-book equivalents available from different publishers, fulfilling only 9-15 per cent of the requirements of most of the courses - something that does not match the library's collection development policy. Research limitations/implications - The present study is based on the books recommended in the curriculum of different science courses of the University of Delhi for the academic year 2009-2010. According to subject-wise distribution of e-books variation of about 2 per cent in the findings occurred, as some books are mentioned in the curriculum of more than one course. This study provides some constructive suggestions which may help librarians to explore ways to spend the budget for collection development of e-books in a more appropriate way. Originality/value - As this paper is based on in-depth quantitative analysis of availability of e-books according to need of a particular academic library, generalization about availability of e-books cannot be made. However, it contributes to trace the growth of e-books and suggests some alternatives to develop e-book collection. Further studies can be done for different library settings to find out their need for and availability of e-books. Copyright © 2013 Emerald Group Publishing Limited. All rights reserved.

Pant A.,Defence Scientific Information and Documentation Center | Moorthy A.L.,BrahMos Aerospace Pvt Ltd
Annals of Library and Information Studies | Year: 2013

Traditional knowledge (TK) is the knowledge base of a particular society or community which has been generated over a period of time through the process of learning and sharing by its members. TK is time tested and has been playing a vital role in sustainable development of the indigenous communities. Commercialization of biodiversity and traditional knowledge has increased the threat of misappropriation. Indian cultural and scientific heritage is discussed in this paper. Proper KM practices are required to tap that knowledge. This paper highlights the need to develop an Indigenous Knowledge Management System (IKMS) for indigenous communities which should document the knowledge heritage (without jeopardizing local culture, societal practices, IPRs, etc.) and it should also improve the process of adaptation, adoption and experimentation of the traditional knowledge. To develop an IKMS, various types of knowledge management tools and platforms are discussed. This paper also highlights the major issues/challenges in management of traditional knowledge.

Sinha A.,Sri Sukhmani Institute Of Engg And Technology | Sejwal L.,Defence Scientific Information and Documentation Center | Kumart N.,Defence Scientific Information and Documentation Center | Yadav A.,Defence Scientific Information and Documentation Center
2015 International Conference on Computing for Sustainable Global Development, INDIACom 2015 | Year: 2015

The need for the development and use of a Network Management System (NMS) arises ipso facto that a typically huge network incorporates a huge number of interlinked network components for the transfer of data across channels making it essential to ensure the up keeping of such components for an uninterrupted communication. Such large scale deployment of components makes it tricky for an individual to pin point the fault manually within network resulting in wastage of time and money. In order to overcome these problems there is a need to develop a software that can not only automate the entire process but should also be backward compatible to support non-SNMP based devices within network avoiding the need for the deployment of new ones, hence making the entire process cost effective. The paper presents the details of an in-house developed ICMP based NMS that can perform the above tasks faster as compared to conventional approach using a multithreaded approach for both LAN and WAN. © 2015 IEEE.

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