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Search Results: 1 - 10 of 226 matches for " Baras JohnS "
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Energy-Efficient Source Authentication for Secure Group Communication with Low-Powered Smart Devices in Hybrid Wireless/Satellite Networks
Roy-Chowdhury Ayan,Baras JohnS
EURASIP Journal on Wireless Communications and Networking , 2011,
Abstract: We describe a new class of lightweight, symmetric-key digital certificates called extended TESLA certificates and a source authentication protocol for wireless group communication that is based on the certificate. The certificate binds the identity of a wireless smart device to the anchor element of its key chain; keys from the chain are used for computing message authentication codes (MACs) on messages sourced by the device. The authentication protocol requires a centralized infrastructure in the network: we describe the protocol in a hybrid wireless network with a satellite overlay interconnecting the wireless devices. The satellite is used as the Certificate Authority (CA) and also acts as the proxy for the senders in disclosing the MAC keys to the receivers. We also design a probabilistic nonrepudiation mechanism that utilizes the satellite's role as the CA and sender proxy. Through analysis, we show that the authentication protocol is secure against malicious adversaries. We also present detailed simulation results that demonstrate that the proposed protocol is much cheaper than traditional public key-based authentication technologies for metrics like processing delay, storage requirements, and energy consumption of the smart devices.
Aligning Sequences by Minimum Description Length
JohnS Conery
EURASIP Journal on Bioinformatics and Systems Biology , 2008, DOI: 10.1155/2007/72936
Abstract: [12345678910111213141516171819202122232425262728293031323334353637383940]
Plant Biodiversity and Malnutrition: Simple Solutions to Complex Problems
T. Johns
African Journal of Food, Agriculture, Nutrition and Development , 2003,
Abstract: Given the difficulty of precisely identifying optimal diets, diversity provides an intrinsic buffer against uncertainties posed by lack of knowledge and by environmental change. Plant biodiversity offers useful perspectives on a number of issues of contemporary scientific and public health importance including, micronutrient deficiency and bioavailability, nutrition and disease, the nutrition transition, and medicinal and functional activities of plants. Globally, simplification of the diets of large numbers of people to a limited number of high-energy foods as a result of urbanization and socioeconomic changes presents unprecedented obstacles to human health associated with emerging diseases such as diabetes, hypertension and cancer. Greater use of plant biodiversity based on scientific evaluation of plant properties, cultural support programs, dietary education, innovative processing and marketing provides a possible avenue for mediating the impacts of change. The diverse nutrition and health functions that plants serve in traditional culture, and indigenous knowledge of plant diversity, offer potentially valuable solutions that enable biodiversity to address the problems facing contemporary society. This paper summarizes empirical evidence supporting the hypothesis that dietary diversity is essential for health and that biodiversity can be equated with dietary diversity. Further population studies on the relationship of dietary diversity including in plant varieties and health as well as research into mechanism through which diversity affects individual health are needed to test the validity of this hypothesis. Nutritional blindness is presented as a case where attention on one nutrient, vitamin A, overshadows important diseases such as cataracts and the potential importance of plant resources in mediating their effects.
The Thetford treasure
Catherine Johns
Gold Bulletin , 1981, DOI: 10.1007/BF03216563
Abstract:
The novel as a guide to Indonesian social history
A. Johns
Bijdragen tot de Taal-, Land- en Volkenkunde , 1959,
Abstract:
It is presented initially: linear dislocation & inter-language strategies in Brazilian Academic abstracts in english and portuguese It is presented initially: linear dislocation & inter-language strategies in Brazilian Academic abstracts in english and portuguese
Tim Johns
Ilha do Desterro , 2008,
Abstract: In Brazil, as in the rest of the world, the academic community is under pressure to publish in English so that research findings can enter the mainstream of international debate as rapidly and effectively as possible. For the same reason, it is the editorial policy of most Brazilian academic journals that all papers, whether published in Portuguese or English, should be accompanied by abstracts in both languages. If the inclusion of English abstracts is not to become a meaningless ritual, it is a matter of some importance to evaluate how well the writers of such abstracts succeed in communicating the substance of their work to their peers outside Brazil, and also to examine the linguistic features that may facilitate or interfere with that communication. Although preliminary work has been undertaken by the author on both these questions, the present paper addresses the second only, with special reference to a problem at the intersection of syntax and discourse. In Brazil, as in the rest of the world, the academic community is under pressure to publish in English so that research findings can enter the mainstream of international debate as rapidly and effectively as possible. For the same reason, it is the editorial policy of most Brazilian academic journals that all papers, whether published in Portuguese or English, should be accompanied by abstracts in both languages. If the inclusion of English abstracts is not to become a meaningless ritual, it is a matter of some importance to evaluate how well the writers of such abstracts succeed in communicating the substance of their work to their peers outside Brazil, and also to examine the linguistic features that may facilitate or interfere with that communication. Although preliminary work has been undertaken by the author on both these questions, the present paper addresses the second only, with special reference to a problem at the intersection of syntax and discourse.
Julius von Schlosser, 'The Vienna school of the history of art (1934)'
Karl Johns
Journal of Art Historiography , 2009,
Abstract: Julius v. Schlosser, The Vienna School of the History of Art - Review of a Century of Austrian Scholarship in German Including a list of members edited by Hans Hahnloser. Dedicated to the spirit of Theodor von Sickel and Franz Wickhoff on the 25th anniversary of their deaths and the occasion of the 80th anniversary of the sterreichisches Institut für Geschichtsforschung. A translation of ‘Die Wiener Schule der Kunstgeschichte‘, Mitteilungen des sterreichischen Institut für Geschichtsforschung Erg nzungs-Band 13, Heft 2, Innsbruck: Wagner 1934.
Moriz Thausing and the road towards objectivity in the history of art (1883), with a provisional list of his publications and translation of his inaugural lecture ‘The status of the history of art as an academic discipline’
Karl Johns
Journal of Art Historiography , 2009,
Abstract: On the basis of their substantial publications and widely publicized polemics, Alois Riegl and Franz Wickhoff are justifiably considered the founding figures of the so-called Vienna School of Art History. The historical accident that specialized journals did not previously exist, and meetings and public discussions of the methodology of the history of art did not yet regularly take place, should not however obscure the fact that a coherent and outspoken tradition already existed. When Moriz Thausing held his inaugural lecture in 1873, he was delineating a course of study which linked the history of art to the other disciplines as he must have himself already have been teaching for nearly a decade. His discussion of the nature of art and the method of its historical study as distinct from related subjects and particularly philosophical aesthetics are worth recalling in the context of the origins of the academic study of the history of art.
Julius von Schlosser and the need to reminisce
Karl Johns
Journal of Art Historiography , 2009,
Abstract: In the present essay of 1936, Julius Schlosser seems to have originated the term of ‘die Wiener Schule de Kunstgeschichte’. After surviving a period of exasperating rivalry with Josef Strzygowski, seeing so many colleagues go to their graves before completing their favorite projects, and possibly since Wilhelm Waetzoldt decided to omit Austrians from his Deutsche Kunsthistoriker, there were several reasons for a man of his age, experience and critical vigor to take stock of a development which seemed to be heading into an uncertain future.
Julius von Schlosser on Vasari: a translation from Die Kunstliteratur (1924)
Karl Johns
Journal of Art Historiography , 2010,
Abstract: Although Julius Schlosser is well known by name and as a source for bibliographical references, very few art historians are familiar with the substance of his forty year teaching career which inspired the likes of Kris, Kurz, Bodonyi, Gombrich and many others. Die Kunstliteratur of 1924 became his fifth and final such handbook, and was published with the intention to elucidate the pre-history of the history of art as an academic discipline. It is natural that Giorgio Vasari has a place at the core of such a story. However, Schlosser possessed an unrivalled knowledge of the relevant written and theoretical sources, and his unusually consistent approach found Lorenzo Ghiberti to be the actual founder of the subject and Winckelmann to have finally overcome the relatively pernicious influence of Vasari. This chapter from the centre of his book therefore still today remains the best critical account of Vasari’s writings from a broader point of view.
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