International Institute of Information Technology, Hyderabad

About: International Institute of Information Technology, Hyderabad is a education organization based out in Hyderabad, India. It is known for research contribution in the topics: Authentication & Internet security. The organization has 2048 authors who have published 3677 publications receiving 45319 citations. The organization is also known as: IIIT Hyderabad & International Institute of Information Technology (IIIT).

Language independent identification of parallel sentences using Wikipedia

Abstract: This paper details a novel classification based approach to identify parallel sentences between two languages in a language independent way. We substitute the required language specific resources by the richly structured multilingual content, Wikipedia. Our approach is particularly useful to extract parallel sentences for under-resourced languages like most Indian and African languages, where resources are not readily available with necessary accuracies. We extract various statistics based on the cross lingual links present in Wikipedia and use them to generate feature vectors for each sentence pair. Binary classification of each pair of sentences into parallel or non-parallel has been done using these feature vectors. We achieved a precision upto 78% which is encouraging when compared to other state-of-art approaches.These results support our hypothesis of using Wikipedia to evaluate the parallel coefficient between sentences that can be used to build bilingual dictionaries.

A secure and efficient ECC-based user anonymity preserving single sign-on scheme for distributed computer networks

Abstract: A user authentication in the distributed computer networks DCNs plays a crucial rule to verify whether the user is a legal user and can therefore be granted access to the requested services to that user. In recent years, several RSA-based single sign-on mechanisms have been proposed in DCNs. However, most of them cannot preserve the user anonymity when possible attacks occur. The user devices are usually battery limited e.g., cellular phones and the elliptic-curve cryptosystem is much efficient than RSA cryptosystem for the battery-limited devices. In this paper, we aim to propose a new secure elliptic-curve cryptosystem-based single sign-on mechanism for user authentication and key establishment for the secure communications in a DCNs using biometric-based smart card. In our scheme, a user only needs to remember a private password and his or her selected unique identity to authenticate and agree on a high-entropy cryptographic one-time session key with a provider to communicate over untrusted public networks. Through formal and informal security analysis, we show that our scheme prevents other known possible attacks. In addition, we perform simulation on our scheme for the formal security verification using the widely-accepted Automated Validation of Internet Security Protocols and Applications tool. The simulation results ensure that our scheme is secure against replay and man-in-the-middle attacks. Furthermore, our scheme provides high security along with lower computational cost and communication cost, and as a result, our scheme is much suitable for the battery-limited devices as compared to other related RSA-based schemes. Copyright © 2014 John Wiley & Sons, Ltd.

Physical, chemical and geotechnical characterization of fly ash, bottom ash and municipal solid waste from Telangana State in India

Abstract: Utilization of fly ash, bottom ash and municipal solid waste in the field of geotechnical engineering necessitates determination of its physical, chemical, morphological and engineering properties. This paper presents detailed physical, chemical and geotechnical characterization of fly ash, bottom ash and municipal solid waste from Telangana State in India. Fly ash and bottom ash samples were collected from Kakatiya thermal power station in India. Municipal solid waste (MSW) sample was collected from Borabanda municipal dump site in the city of Hyderabad, India. From the experimental results, it is noticed that specific gravity of fly ash, bottom ash and municipal solid waste were found to be 1.86, 1.77 and 2.2 respectively. Presence of quartz and mullite; quartz, mullite and calcium carbonate; and quartz and corundum are found to be predominant in fly ash, bottom ash and MSW respectively. The peak friction angle of fly ash, bottom ash and municipal solid waste were found to be 37.02°, 33.77° and 35.23° respectively. Permeability characteristics of fly ash, bottom ash and municipal solid waste were observed to be 1.01E−04 cm/s, 2.01E−04 cm/s and 1.16E−04 cm/s respectively. From the observation of experimental results, it can be concluded that fly ash, bottom ash and municipal solid waste from Telangana state are effective material to be used as backfill material, filter material and embankment construction.

Mechanistic insights from a quantitative analysis of pollen tube guidance

Abstract: Plant biologists have long speculated about the mechanisms that guide pollen tubes to ovules. Although there is now evidence that ovules emit a diffusible attractant, little is known about how this attractant mediates interactions between the pollen tube and the ovules. We employ a semi-in vitro assay, in which ovules dissected from Arabidopsis thaliana are arranged around a cut style on artificial medium, to elucidate how ovules release the attractant and how pollen tubes respond to it. Analysis of microscopy images of the semi-in vitro system shows that pollen tubes are more attracted to ovules that are incubated on the medium for longer times before pollen tubes emerge from the cut style. The responses of tubes are consistent with their sensing a gradient of an attractant at 100-150 μm, farther than previously reported. Our microscopy images also show that pollen tubes slow their growth near the micropyles of functional ovules with a spatial range that depends on ovule incubation time. We propose a stochastic model that captures these dynamics. In the model, a pollen tube senses a difference in the fraction of receptors bound to an attractant and changes its direction of growth in response; the attractant is continuously released from ovules and spreads isotropically on the medium. The model suggests that the observed slowing greatly enhances the ability of pollen tubes to successfully target ovules. The relation of the results to guidance in vivo is discussed.

A speech-based conversation system for accessing agriculture commodity prices in Indian languages

Abstract: We demonstrate a speech based conversation system under development for information access by farmers in rural and semi-urban areas of India. The challenges are that the system should take care of the significant variations in the pronunciation and also the highly natural and hence unstructured dialog in the usage of the system. The focus of this study is to develop a conversational system which is adaptable to the users over a period of time, in the sense that fewer interactions with the system to get the required information. Some other novel features of the system include multiple decoding schemes and accountability of the wide variations in dialog, pronunciation and environment. A video demonstrating the Mandi information system is available at http://speech.iiit.ac.in/index.php/demos.html