8,907 research outputs found
A new species Ophichthus chennaiensis sp. nov. (Anguilliformes: Ophichthidae) from the southeast coast of India
No full textDas, Mrinal Kumar, Mohapatra, Anil, Rajendar, Kumar R., Bhaskar, Ranjana (2020): A new species Ophichthus chennaiensis sp. nov. (Anguilliformes: Ophichthidae) from the southeast coast of India. Zootaxa 4895 (2): 291-296, DOI: https://doi.org/10.11646/zootaxa.4895.2.
FIG. 2 in A new species Ophichthus chennaiensis sp. nov. (Anguilliformes: Ophichthidae) from the southeast coast of India
No full textFIG. 2 Pattern of head pores in Ophichthus chennaiensis sp. nov.Published as part of Das, Mrinal Kumar, Mohapatra, Anil, Rajendar, Kumar R. & Bhaskar, Ranjana, 2020, A new species Ophichthus chennaiensis sp. nov. (Anguilliformes: Ophichthidae) from the southeast coast of India, pp. 291-296 in Zootaxa 4895 (2) on page 293, DOI: 10.11646/zootaxa.4895.2.8, http://zenodo.org/record/432259
Partial Function Extension with Applications to Learning and Property Testing
Get PDFPartial function extension is a basic problem that underpins multiple research topics in optimization, including learning, property testing, and game theory. Here, we are given a partial function consisting of n points from a domain and a function value at each point. Our objective is to determine if this partial function can be extended to a function defined on the domain, that additionally satisfies a given property, such as linearity. We formally study partial function extension to fundamental properties in combinatorial optimization - subadditivity, XOS, and matroid independence. A priori, it is not clear if partial function extension for these properties even lies in NP (or coNP).
Our contributions are twofold. Firstly, for the properties studied, we give bounds on the complexity of partial function extension. For subadditivity and XOS, we give tight bounds on approximation guarantees as well. Secondly, we develop new connections between partial function extension and learning and property testing, and use these to give new results for these problems. In particular, for subadditive functions, we give improved lower bounds on learning, as well as the first subexponential-query tester
The Complexity of Partial Function Extension for Coverage Functions
Get PDFCoverage functions are an important subclass of submodular functions, finding applications in machine learning, game theory, social networks, and facility location. We study the complexity of partial function extension to coverage functions. That is, given a partial function consisting of a family of subsets of [m] and a value at each point, does there exist a coverage function defined on all subsets of [m] that extends this partial function? Partial function extension is previously studied for other function classes, including boolean functions and convex functions, and is useful in many fields, such as obtaining bounds on learning these function classes.
We show that determining extendibility of a partial function to a coverage function is NP-complete, establishing in the process that there is a polynomial-sized certificate of extendibility. The hardness also gives us a lower bound for learning coverage functions. We then study two natural notions of approximate extension, to account for errors in the data set. The two notions correspond roughly to multiplicative point-wise approximation and additive L_1 approximation. We show upper and lower bounds for both notions of approximation. In the second case we obtain nearly tight bounds
Minimally invasive surgical (MIS) techniques in the management of benign and malignant kidney conditions
No full textMy thesis underlines the role and current evidence of minimally invasive surgical (MIS) technique for benign and malignant renal conditions.Evidence is presented for the use of laparoscopic and robotic partial nephrectomy along with expanding indications for ureteroscopy. Systematic reviews of ureteroscopy for large stones, obese patients, patients with bleeding diathesis and children is presented. Use of ureteroscopy for endoscopic diagnosis and management of upper urinary tract tumours is also presented.The work is comprised of 12 peer-reviewed published papers including 8 systematic reviews and 4 original research papers using retrospective or prospective case series on the subject.Based on the evidence, new insight into MIS for renal conditions will help clinicians and patients in informed decision-making. Minimally invasive surgery is a step in the right direction for management of various benign and malignant renal conditions. My work demonstrates evidence-based outcomes, which will ensure widespread adoption of these techniques in future
Bibliographics for the 983 eprints in the live archives of E-LIS : trends and status report up to 7th July 2004, based on author-self-archiving metadata
Get PDFThe priority for ideas and philosophy related to "Network Theory" have been traced back and documented by Braun(2004),and credit goes to Karinthy(1929).The IT has empowered to realise it, as the most practical phenomena and it is no more a humour. The OAI (Open Archives Initiatives)and ACIS (Academic Contributor Information System)are progressive in the direction ,which may lead to realise the "Collective Genius" at global level. Focus of present study is on Author-Self-Archiving (A-S-A)Metadata of the 983 Eprints in the Live Archives of the E-LIS (EPrints of Library and Information Science),which were approved till 7th July 2004.The A-S-A Metadata was used for librametric analysis. Self-explanatory bibliographics are illustrated.The highlights include: Conference papers (34%); highest approval, June 2004 (28%); published archives (76%);not refereed (52%); not in public domain (60%); highest self-archiving-author (De Robbio, Antonella).The Nos. of EPrints having single JITA domain specifications were: Theoretical and general aspects of libraries and information(27); Information use and sociology of information(80);Users,literacy and reading(13);Libraries as physical collections(30);Publishing and legal issues(57);Management(13);Industry, profession and education(36);Information sources, supports, channels(113) ; Information treatment for information services, Information functions and techniques (101); Technical services libraries, archives and museums(25); Housing technologies(1); Information technology and library technology(92); and Inter-domainery (395) i.e. having specifications of two or more than two JITA classes
Wikis: Tool for Altering Tacit Knowledge Explicit
Get PDFThe paper presentsives an overview of the concept and dimensions of knowledge and its management in libraries using ICT based systems. Explores how Wikis can be used in libraries to commute the implicit knowledge explicit among the professionals and the users. Discusses in detail the scope of Wikis implementation in libraries. Explains the relative advantage and weakness of Wikis as a knowledge management tool in libraries
Damien Paulin, Dinesh Kumar, Raghav Bhaskar and Georges Quenot
No full textThis paper presents a system that performs the recovery of camera motion parameters and the segmentation of mobile objects in video documents for content indexing. Two dierent methods are used for the recovery of the camera motion (relatively to the main background), the rst for a camera maintained at a xed location with rotational and zoom degrees of freedom, and the second for a camera of arbitrary motion but assuming a xed focal length. The rst method is based on the search of an optimal projective transform between consecutive images combined with an iterative background / mobile objects segmentation process. The second method is based on a paraperspective factorization method for shape and motion recovery. Both methods rely on the use of a dense and high-quality matching between consecutive images (optical ow). The system also attempts to classify shots or sub-segments of shots into one of the following categories of \no motion", \non mobile camera motion", \mobile camera motion" or \other type of motion"
Parapharyngodon hemidactylii Gupta, Bhaskar & Gupta, 2009, n. sp.
No full textParapharyngodon hemidactylii n. sp. (n= 15 males, n= 20 females) The parasite is a tender white cylindrical worm tapering at both the ends. Prominent annulations visible beginning just behind cephalic extremity and continuing up to the anus. Sexual dimorphism is clearly distinct. Triangular oral opening is surrounded by 3 bilobed lips. Adult male (All measurements are in mm. unless otherwise stated). Cylindrical worm 0.755 (0.47–0.96) long, 0.236 (0.18–0.37) wide at its maximum width (Plate I Fig. 1; Plate III Fig. 1). Cuticle with annulations forming swollen rings in posterior region. Esophageal tube 0.283 (0.20–0.54) long and 0.031 (0.02–0.04) wide. Esophageal bulb 0.079 (0.05–0.11) long and 0.089 (0.07–0.11) wide (Plate I Fig. 2). Nerve ring not clearly distinct. Caudal papillae absent. Spicules 0.049 (0.035–0.085) long and pointed (Plate I Fig. 3). Tail filament 0.065 (0.01–0.09) long, terminal in position and directed posteriorly (Plate I Fig. 4, 5; Plate III Fig. 2). Adult female (All measurements are in mm. unless otherwise stated). Body length 3.47 (2.47–4.05), width 0.405 (0.33–0.51) at maximum width (Plate II Fig. 1, 2; Plate III Fig. 3). Cuticle with annulations approximately 0.032 (0.01–0.055) long and 0.021 (0.015–0.035) in width (Plate II Fig. 1; Plate III Fig. 4). Esophageal tube or corpus 0.55 (0.50–0.64) in length and 0.05 (0.045–0.06) in width and esophageal bulb 0.194 (0.17–0.215) in length and 0.225 (0.21–0.26) in width (Plate II Fig. 2; Plate III Fig. 5). Reproductive structures confined to body cavity between vulva and anus and the developing ova visible in the uterus (Plate III Fig. 6). Nerve ring not clearly distinct. Excretory pore and vulva situated at 1.18 and 1.44 (1.20–1.70) respectively from the anterior end (Plate II Fig. 3; Plate IV Fig. 1). Body with conical termination (Plate II Fig. 5; Plate IV Fig. 2). Tail 0.11 (0.075–0.135) long and 0.063 (0.045–0.10) wide (Plate IV Fig. 3). Eggs oval 0.08 (0.02–0.10) long, 0.041 (0.01–0.06) wide (Plate II Fig. 4, 6; Plate IV Fig. 4) PLATE I Camera lucida diagrams of Thelandros hemidactylii n. sp. Male showing Fig. 1 Anterior most region; Fig. 2 Anterior region; Fig. 3 Spicule; Fig. 4 Posterior region (dorsoventral view); Fig. 5 Posterior region (lateral view). PLATE II Camera lucida diagrams of Thelandros hemidactylii n. sp. Female showing Fig. 1 Anterior most region; Fig. 2 Anterior region with oesophagus and intestine; Fig. 3 Vulva region; Fig. 4 Egg; Fig. 5 Posterior region; Fig. 6 Middle region with eggs. PLATE III Photomicrographs of Thelandros hemidactylii n. sp. (X 400). Male showing Fig. 1 Anterior end; Fig. 2 Posterior end; female Fig. 3 Anterior end showing oesophageal region; Fig. 4 Surface of Thelandros showing cuticular annulations; Fig. 5 Oesophageal bulb and intestinal junction; Fig. 6 Intestinal region showing developing ova. PLATE IV Photomicrographs of Thelandros hemidactylii n. sp. (Fig. 1– 3 X 400). Female showing Fig. 1 Parasite showing vulva region; Fig. 2 Parasite showing posterior end with eggs; Fig. 3 Parasite showing tail region; Fig. 4 Parasite showing eggs (X 1000).Published as part of Gupta, Neelima, Bhaskar, Manju & Gupta, Dileep Kumar, 2009, Gastro-intestinal invasion in Hemidactylus flaviviridis with a new species of Parapharyngodon (Oxyuroidea: Pharyngodonidae), pp. 39-51 in Zootaxa 2165 on pages 40-44, DOI: 10.5281/zenodo.18908
A Unified Shell model for Buoyancy-Driven Turbulence
No full textWe construct a unified shell model for stably stratified and convective turbulence. Shell model simulation of stably stratified flow in turbulent regime exhibit Bolgiano-Obukhbov (BO) scaling in which the kinetic energy spectrum varies as . However, simulation of convective turbulence shows Kolmogorov's spectrum. These results are consistent with the direct numerical simulations of Kumar {\em et al.} [Phys. Rev. E {\bf 90}, 023016 (2014)]. We also observe a dual scaling ( and ) for a limited range of parameters in stably stratified flow
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