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Yadav T.K.,Banaras Hindu University | Singh A.K.,IT | Kumar K.,Allahabad University | Kumar K.,Italian Institute of Technology | Yadav R.A.,Banaras Hindu University
Optical Materials | Year: 2011

Multifunctional europium doped Li2O-Nb2O 3-B2O2 glass has been prepared by melt-quench method. Through subsequent heat treatments glass has then been transformed into glass ceramics containing ferroelectric LiNbO3 phase. The glass ceramics have shown enhanced Eu3+ emission compared to parent glass when excited by 266 nm radiation. The emission measurements of glass ceramics have also shown the presence of Eu2+ state along with Eu3+ and Eu2+ state was found to increase when glass was heated in inert atmosphere. Lifetime of the 5D0 level of the Eu 3+ has been measured and a significant increase is found in case of glass ceramic prepared around glass transition temperature. Glass ceramics have also shown good second harmonic generation (SHG) with pulsed 1064 nm laser excitation. © 2011 Elsevier B.V. All rights reserved.

Zuquete A.,University of Aveiro | Frade C.,IT
Computer Communication Review | Year: 2012

The IPv4 address space is quickly getting exhausted, putting a tremendous pressure on the adoption of even more NAT levels or IPv6. On the other hand, many authors propose the adoption of new Internet addressing capabilities, namely content-based addressing, to complement the existing IP host-based addressing. In this paper we propose the intro- duction of a location layer, between transport and network layers, to address both problems. We keep the existing IPv4 (or IPv6) host-based core routing functionalities, while we enable hosts to become routers between separate address spaces by exploring the new location header. For a proof of concept, we modified the TCP/IP stack of a Linux host to handle our new protocol layer and we designed and con- ceived a novel NAT box to enable current hosts to interact with the modified stack.

Pathak K.,IT | Chaudhari N.S.,Indian Institute of Technology Indore | Tiwari A.,CSE
Proceedings of the 2012 7th IEEE Conference on Industrial Electronics and Applications, ICIEA 2012 | Year: 2012

Association Rules discovered by association rule mining may contain some sensitive rules, which may cause potential threats towards privacy and security. Many of the researchers in this area have recently made efforts to preserve privacy for sensitive association rules in statistical database. In this paper, we propose a heuristic based association rule hiding using oracle real application clusters by introducing the concept of impact factor of transaction on the rule. The impact factor of a transaction is equal to number of itemsets that are present in those itemsets which represents sensitive association rule. Higher the impact factor of a transaction, higher is its sensitivity. Proposed algorithm exhibits the concept of impact factor to hide several rules by modifying fewer transactions. As modifications are fewer, data quality is very less affected. Use of clustering aids in increasing performance by running operations in parallel. © 2012 IEEE.

Fay S.,Palais de la Decouverte | Gautrias S.,IT
Scientometrics | Year: 2015

2015 is the centennial of Einstein General Relativity. On this occasion, we examine the General Relativity and Quantum Cosmology (GRQC) field of research by analysing 38,291 papers uploaded on the electronic archives arXiv.org from 2000 to 2012. We establish a map of the countries contributing to GRQC in 2012. We determine the main journals publishing GRQC papers and which countries publish in which journals. We find that more and more papers are written by groups (instead of single) of authors with more and more international collaborations. There are huge differences between countries. Hence Russia is the country where most of papers are written by single authors whereas Canada is one of the countries where the most of papers imply international collaborations. We also study authors mobility, determining how some groups of authors spread worldwide with time in different countries. The largest mobilities are between USA–UK and USA–Germany. Countries attracting the most of GRQC authors are Netherlands and Canada whereas those undergoing a brain drain are Italy and India. There are few mobility between Europe and Asia contrarily to mobility between USA and Asia. © 2015, Akadémiai Kiadó, Budapest, Hungary.

Van De Groenendaal H.,IT
EngineerIT | Year: 2014

The authors1 examine the entire alternative assembly and reflow technology (AART) process in a White Paper entitled "Comprehensive guidelines for the implementation of the AART process" - available for downloading at www.smtinline.com/html-en/uicaart.pdf. It is designed to provide a process engineer with some of the knowledge necessary to implement a high-yield AART process. The AART principles illustrated in this paper can be designed into a product at the product design phase, or used as a "drop-in" solution to an existing PCB assembly.

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