316 research outputs found
Adaptive physical layer security using code bank of sequences for CDMA
No full textWireless security is an important concern in todays technological world. Wireless devices are used to access data and private applications. From broadband to Wi-Fi, 3G to LTE Advanced, WiMAX to satellite communication every network demands on-the-air security from attacks. Tapping or Jamming attacks leak the secret data, while Service Disruption Attacks affecting QoS (Quality of Service) are relatively easy to perform. In CDMA, the channel and antenna dependent attacks are quite critical to avoid because of its wide bandwidth usage. The critical exchange of time and frequency parameters makes the physical layer elements vulnerable to security related attacks. In order to enable data security and secrecy, there is need of signal protection at the physical layer of CDMA system. Gold codes, M-sequences, OVSF and De-Bruijn sequences were used individually in wireless systems for scrambling purposes in previous proposals. These codes have their own advantages and disadvantages, when channel bandwidth and noise conditions change. This paper proposes a system which would select scrambling codes from a bank of all these mentioned codes depending upon the Signal to Noise Ratio (SNR) or Channel State Information (CSI). This code bank technique is shown as a highly practical solution in selection of proper code for mitigation of attacks and hence, to provide security at the physical layer of CDMA
Pseudirona laeopsi Pillai 1964
No full textPseudirona laeopsi Pillai, 1964 Pseudirona laeopsi Pillai, 1964: 222–223, fig. 6.— Trilles, Ravichandran & Rameshkumar, 2011: 453. Type and type locality. Pillai (1964) collected specimens from the gill chamber of Laeops macrophthalmus (Alcock, 1889) from Anchuthengu, Trivandrum, Kerala Coast, Arabian Sea. The author reported that the holotype female is deposited in the Indian Museum but the detail of the accession number is not available in the original description. The present museum inquiries, at the Indian museum, failed to recover any material for P. laeopsi and it seems that the types were either not submitted or it was lost. Remarks. Pseudirona laeopsi was not reported since its original description by Pillai (1964). Pseudirona laeopsi can be distinguished from other cymothoid species by the extremely spiny and setose appendages. Until now the identification of this species is based only on Pillai’s original description and it needs an accurate redescription. Distribution. Trivandrum, Kerala Coast, India (type locality) (Pillai 1964). Host. Known only from type host Laeops macrophthalmus (Alcock, 1889) (Pillai 1964).Published as part of Ravichandran, S., Vigneshwaran, P. & Rameshkumar, G., 2019, A taxonomic review of the fish parasitic isopod family Cymothoidae Leach, 1818 (Crustacea: Isopoda: Cymothooidea) of India, pp. 1-99 in Zootaxa 4622 (1) on page 72, DOI: 10.11646/zootaxa.4622.1.1, http://zenodo.org/record/337989
Rudiments of materials science
No full textWriting a comprehensive book on Materials Science for the benefit of undergraduate courses in Science and Engineering was a day dream of the first author, Dr. S.O. Pillai for a long period. However, the dream became true after a lapse of couple of years. Lucid and logical exposition of the subject matter is the special feature of this book
Nerocila exocoeti Pillai 1954
No full text<i>Nerocila exocoeti</i> Pillai, 1954 <p>(Fig. 8 a–c)</p> <p> <i>Nerocila exocoeti</i> Pillai, 1954: 12–13.— Kurochkin, 1980: 289.— Bruce, 1987b: 404.— Bruce & Harrison-Nelson, 1988: 592, fig. 4.— Bruce & Bowman, 1989: 1.— Trilles, 1994: 89.— Kensley, 2001: 233.— Trilles, Ravichandran & Rameshkumar, 2011: 451.— Sivasubramanian, Ravichandran, Rameshkumar & Allayie, 2011: 99–101 figs 1–4.— Trilles, Rameshkumar & Ravichandran, 2013: 1273–1286, figs 2c, 7a–i, 8, 9.— Aneesh, Helna, Valarmathi, Chandra & Mitra, 2017c: 385–394, figs 1–7.</p> <p> <i>Nerocila madrasensis</i> Ramakrishna & Ramaniah, 1978: 177 –180, figs 1–3.</p> <p> <b>Type and type locality</b>. The neotype, deposited at National Museum of Natural History, French (MNHN IU- 2009- 1937), from Parangipettai, the Southeastern coast of India, on <i>Exocoetus volitans.</i></p> <p> <b>Material examined.</b> <i>Neotype</i>: 1 ovig. female (28 mm), Parangipettai, 12 April 2011, from <i>Exocoetus volitans,</i> coll. G. Rameshkumar. (MNHN-IU-2009-1937).</p> <p> <i>Non-type</i>: 3 ovig. females, (24–28 mm), Pazhaiyar, 28 December 2016, from <i>Parexocoetus brachypterus</i>, coll. P. Vigneshwaran (CAS / MBRM 500–502); 1 ovig. female (28 mm), Parangipettai, 22 July 2017, from <i>Exocoetus volitans</i>, coll. S. Ravichandran (ZSI / MBRC D1-542); 2 non-ovig. females (22, 24 mm), Parangipettai, 12 April 2011, from <i>Exocoetus volitans,</i> coll. G. Rameshkumar (CAS / MBRM 506, 507) Southeastern coast of India.</p> <p> <b>Remarks.</b> Trilles <i>et al.</i> (2013) redescribed and diagnosed <i>N. exocoeti</i> from the female neotype (MNHN-IU-2009-1937). <i>N. exocoeti</i> can be identified by coxae 2–4, often visible in dorsal view, produced into rounded processes, not exceeding beyond posterior of pereonites; coxae 5–7, much longer than the anterior, posterior margin acute, reaching or extending slightly or distinctly beyond posterior of pereonites. Pleotelson long as wide, lateral margins convex, converging to an indistinct apical point, and that the entire body is blackish blue in color with many chromatophores.</p> <p> <i>Nerocila exocoeti</i> was identified by Pillai (1954) from a large number of specimens in all stages of development collected on <i>Parexocoetus brachypterus</i> from Travancore, India. However, no figures have been published. The author specified only that the main distinguishing character of this species is the comparative size of the coxal plates, the second being small, not extending beyond the posterior border of the segment and the seventh reaching the tip of the first pleon segment, and that the entire body is steel blue in color. Males were collected but not described by Pillai (1954). <i>N. exocoeti</i> was later collected on <i>P. brachypterus</i> and <i>Scomberomorus multiradiatus</i> (gut contents?) from Papua New Guinea, Indonesia, and Taiwan by Bruce & Harrisson-Nelson (1988). Only <i>N. exocoeti</i> and <i>N. trichiuri</i> have been collected from fishes belonging to the family Exocoetidae and both of these species are readily distinguished from each other. In <i>N. exocoeti</i> the uropods are much longer, exopod and endopod extending far beyond the distal margin of pleotelson. In <i>N. trichiuri</i> the coxae and postero-lateral angles of pereonites bluntly rounded and the live specimens of <i>N. trichiuri</i> are pale in colour.</p> <p> <i>Nerocila madrasensis</i> was poorly described by Ramakrishna & Ramaniah (1978) who suggested that this species resembles to <i>N. serra</i> and <i>N. trichiura</i>. Possibly related to <i>N. trichiura</i> according to Bruce (1987a), <i>N. madrasensis</i> and <i>N. trichiura</i> were provisionally synonymized by Trilles (1994) and Trilles <i>et al.</i> (2011). Recently <i>N. madrasensis</i> has been considered as a junior synonym of <i>N. exocoeti</i> based on the type specimen by Aneesh <i>et al.</i> (2017c).</p> <p> <b>Colour.</b> The entire body is steel blue in colour withmany chromatophores (Pillai, 1954).</p> <p> <b>Size.</b> Non-ovig. females 24–28 mm; ovig. females 22–24 mm.</p> <p> <b>Distribution</b>. This species extended from southem India (Pillai 1954; Trilles <i>et al.</i> 2013; Aneesh <i>et al.</i> 2017c) to Papua New Guinea, Indonesia, and Taiwan (Bruce & Harrisson-Nelson 1988).</p> <p> <b>Host.</b> Only known from the beloniform hosts family Exocoetidae: <i>Parexocoetus brachypterus</i> (Pillai 1954; Bruce & Harrisson-Nelson 1988), <i>Exocoetus volitans</i> (Sivasubramanian <i>et al.</i> 2011; Trilles <i>et al.</i> 2013) and family Hemiramphidae: <i>Hemiramphus</i> sp. (Ramakrishna & Ramaniah 1978) and <i>Rhynchorhamphus malabaricus</i> Collette, 1976 (Aneesh <i>et al.</i> 2017).</p>Published as part of <i>Ravichandran, S., Vigneshwaran, P. & Rameshkumar, G., 2019, A taxonomic review of the fish parasitic isopod family Cymothoidae Leach, 1818 (Crustacea: Isopoda: Cymothooidea) of India, pp. 1-99 in Zootaxa 4622 (1)</i> on pages 50-52, DOI: 10.11646/zootaxa.4622.1.1, <a href="http://zenodo.org/record/3379899">http://zenodo.org/record/3379899</a>
Proverbs in Pillai Thamizh (A genre in Tamil Literature)
No full textProverbs is an archaic language and it is rich in simplicity, antiquity and sweetness. Proverbs are in use since ancient times itself. Earlier proverbs are used by the people on daily basis to express their culture. Proverbs are the result of people’s experience. Proverbs are used on daily basis because of its clarity, brevity and relevance. Tholkappiyam, is an ancient grammar text here the author defines proverbs as, it is nothing but a two-line sentence which gives the perfect meaning. Proverbs are used by all people in their day to day life. Human life, their feelings and knowledge are the central theme in proverbs. Proverbs can be considered to be the best in oral literature. Proverbs helps people to develop their intellectual and thinking power. Therefore, Tamil proverbs are considered as the encyclopedia of Tamil people. This article explains the importance of proverbs in ‘Pillai Thamizh’
BIOGRAPHY OF T.V.SAMBASIVAM PILLAI AND AN ANALYSIS OF HIS CONTRIBUTION TO THE SIDDHA SYSTEM OF MEDICINE
No full textT.V.Sambasivam pillai, the acclaimed author, of the Cyclopaedic Dictionary is well known in the field of Indian Medicine especially Siddha medicine. Cyclopaedic Dictionary is considered as one of the great treasures of the Siddha system. Neither did he possess a basic medical degree nor he hailed from a family with medical background but his depth of knowledge in the Siddha system is highly commendable. He spent his entire life contributing and deciphering the ancient literatures of the Siddha system. This article is a tribute to his dedication, aspiration, devotion, and sacrifice for the Siddha system of Medicine and aids in highlighting the excerpts of the Cyclopaedic Dictionary
A new parasitic copepod, Caligus krishnai, from the mackerel tuna Euthynnus affinis affinis (Cantor)
No full textSeveral species of the genus Caligus parasitic on South Indian fishes have been
described by Pillai (Pillai, 1961 ; 1963 and 1964). The species described in this
paper was identified as Caligus kuroshio Shiino by Pillai (1963). The present author
considers this as a new species. Figures are omitted as Pillai (1963) has given
detailed illustrations
A systemic functional linguistic transitivity analysis of character in the Mahabharata, Duryodhana and Draupadi / Shevaanni Pillai
No full textThe current study is a Systemic Functional Linguistic (SFL) (Halliday and Matthiessen,
2014) investigation of character in a famous and timeless Sanskrit epic called The
Mahabharata, a beloved Indian narrative classic and an important piece of history (Doniger,
2020). The data used for the study is an English retold version by Krishna Dharma (1999)
who is a well-known author of Indian classics. Altogether four chapters of the book are used
in relation to the topic, The Dice Game. The current study employs Halliday’s System of
Transitivity as a theoretical framework to analyze two central characters, Duryodhana, a
Kaurava prince and antagonist of the story and Draupadi, a Pandava princess and protagonist
of the story. The methodology will employ Cresswell’s (2017) qualitative textual analysis
and Sriniwass’s (2009) SFL methodology to analyze the data in a systematic way. A total of
620 sentences were analysed regarding the two characters. For Duryodhana, the predominant
Participant role is Actor (15.86%) which has the most frequent characteristics of wickedness,
hot-temperedness and enviousness foregrounding him as a dominant villain. In contrast, for
Draupadi, the predominant transitivity role is Goal (19.26%) which has the most frequent
characteristics of helplessness, valuableness, and wisdom, rendering her the victim of
Duryodhana’s greed and cruelty. In terms of Circumstances, the Circumstance of Manner
was the most prominent found for both Duryodhana (26.42%) and Draupadi (22.78%) which
showed many adverbial and adjectival phrases showing their characteristics. Similarly, the
Material process (Transformative-Transitive) was most prominent Process type found for
both Duryodhana 26.12% and Draupadi 39.18%. The study has shown that the System of Transitivity was indeed a useful tool to study how characters are constructed through a
linguistic analysis of a narrative text. The significance of the study is that it shows how
characters can be interpreted in an objective way using transitivity patterns found in the text
Not Available
No full textNot AvailableSeveral species of the genus Caligus parasitic on South Indian fishes have been
described by Pillai (Pillai, 1961 ; 1963 and 1964). The species described in this
paper was identified as Caligus kuroshio Shiino by Pillai (1963). The present author
considers this as a new species. Figures are omitted as Pillai (1963) has given
detailed illustrations.Not Availabl
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