Time filter

Source Type

Hyderabad, India

The International Institute of Information Technology, Hyderabad is an autonomous university in Hyderabad, Telangana, India. It was established in 1997, and is one of the top Computer Science institutes in the country. It emphasizes research from the undergraduate level. It has been a consistent performer from India in ACM International Collegiate Programming Contest and finished at #18 in 2012. Raj Reddy, the only Indian to win the Turing Award, is chairman of the board of governors.The institute runs Computer Science courses and research projects and is focused on research. It gives the students interaction with industry, preparation in entrepreneurship and personality development courses. IIIT Hyderabad is the mentor institute to Indian Institute of Information Technology, Sri City Wikipedia.

Das A.K.,International Institute of Information Technology, Hyderabad
IET Information Security | Year: 2011

The author first reviews the recently proposed Li-Hwang's biometric-based remote user authentication scheme using smart cards; then shows that the Li-Hwang's scheme has some design flaws in their scheme. In order to withstand those flaws in their scheme, an improvement of their scheme is further proposed. The author also shows that the improved scheme provides strong authentication with the use of verifying biometric, password as well as random nonces generated by the user and the server as compared to that for the Li-Hwang's scheme and other related schemes. © 2011 The Institution of Engineering and Technology.

Sau T.K.,International Institute of Information Technology, Hyderabad | Rogach A.L.,City University of Hong Kong
Advanced Materials | Year: 2010

Metal nanoparticles have been the subject of widespread research over the past two decades. In recent years, noble metals have been the focus of numerous studies involving synthesis, characterization, and applications. Synthesis of an impressive range of noble metal nanoparticles with varied morphologies has been reported. Researchers have made a great progress in learning how to engineer materials on a nanometer length scale that has led to the understanding of the fundamental size- and shape-dependent properties of matter and to devising of new applications. In this article, we review the recent progress in the colloid-chemical synthesis of nonspherical nanoparticles of a few important noble metals {mainly Ag, Au, Pd, and Pt), highlighting the factors that influence the particle morphology and discussing the mechanisms behind the nonspherical shape evolution. The article attempts to present a thorough discussion of the basic principles as well as state-of-the-art morphology control in noble metal nanoparticles. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA.

Das A.K.,International Institute of Information Technology, Hyderabad
International Journal of Network Security | Year: 2012

In this paper, we propose a novel identity-based random key pre-distribution scheme called the identity based key pre-distribution using a pseudo random function (IBPRF), which has better trade-off between communication overhead, network connectivity and resilience against node capture compared to the other existing key pre-distribution schemes. IBPRF always guarantees that no matter how many sensor nodes are captured, the secret communication between non-compromised sensor nodes are still secure. We then propose an improved version of our scheme in a large-scale hierarchical wireless sensor network. This improved approach has better trade off among network connectivity, security, communication, computational and storage overheads, and scalability than the existing random key pre-distribution schemes. The strength of the proposed IBPRF scheme and its improved approach is establishing pairwise secret keys between neighboring nodes with scantling communication and computational overheads. The improved IBPRF approach further supports a large-scale sensor network for the network connectivity. Through the analysis we show that the improved IBPRF scheme provides better security and lower overheads than other existing schemes.

Dhananjaya N.,International Institute of Information Technology, Hyderabad
The Journal of the Acoustical Society of America | Year: 2012

In this paper, the acoustic-phonetic characteristics of steady apical trills--trill sounds produced by the periodic vibration of the apex of the tongue--are studied. Signal processing methods, namely, zero-frequency filtering and zero-time liftering of speech signals, are used to analyze the excitation source and the resonance characteristics of the vocal tract system, respectively. Although it is natural to expect the effect of trilling on the resonances of the vocal tract system, it is interesting to note that trilling influences the glottal source of excitation as well. The excitation characteristics derived using zero-frequency filtering of speech signals are glottal epochs, strength of impulses at the glottal epochs, and instantaneous fundamental frequency of the glottal vibration. Analysis based on zero-time liftering of speech signals is used to study the dynamic resonance characteristics of vocal tract system during the production of trill sounds. Qualitative analysis of trill sounds in different vowel contexts, and the acoustic cues that may help spotting trills in continuous speech are discussed.

Priyakumar U.D.,International Institute of Information Technology, Hyderabad
Journal of Biomolecular Structure and Dynamics | Year: 2012

The role of salt bridges in chromatin protein Sso7d, from S. solfataricus has previously been shown to be crucial for its unusual high thermal stability. Experimental studies have shown that single site mutation of Sso7d (F31A) leads to a substantial decrease in the thermal stability of this protein due to distortion of the hydrophobic core. In the present study, we have performed a total of 0.2 μs long molecular dynamics (MD) simulations on F31A at room temperature, and at 360 K, close to the melting temperature of the wild type (WT) protein to investigate the role of hydrophobic core on protein stability. Sso7d-WT was shown to be stable at both 300 and 360 K; however, F31A undergoes denaturation at 360 K, consistent with experimental results. The structural and energetic properties obtained using the analysis of MD trajectories indicate that the single mutation results in high flexibility of the protein, and loosening of intramolecular interactions. Correlation between the dynamics of the salt bridges with the structural transitions and the unfolding pathway indicate the importance of both salt bridges and hydrophobic in effecting thermal stability of proteins in general. ©Adenine Press (2012).

Discover hidden collaborations