136,075 research outputs found
Performance investigation of PID controller in trajectory control of two-link robotic manipulator in medical robots
No full textRobot-assisted surgical procedures have gained much coverage in recent years and favored over manually conducted operations. The medical robots are comprised of manipulators arm that is the multi-degree of freedom positioning devices with a highly non-linear nature to perform various surgical tasks. Due to non-linear effects, robots offer a severe challenge to the control system. Therefore, the control techniques are required for controlling the robots that should be fast enough to accommodate the rapid changes in the system parameters. In this article, the Proportional-Integral-Derivative (PID) controller’s performance has been investigated in trajectory control of the Two-Link Robotic Manipulator (TLRM) for reliable functioning of these robots. Tracking error and Control input factors have been used to investigate the PID controller’s robustness in trajectory control of ‘TLRM.’ Euler’s-lagrange approach has been used for dynamic analysis of ‘TLRM’. This work has been accomplished in the MATLAB®/ Simulink environment.Kuldeep Jayaswal, D. K. Palwalia & Sandeep Kumar (2021) Performance investigation of PID controller in trajectory control of two-link robotic manipulator in medical robots, Journal of Interdisciplinary Mathematics, 24:2, 467-478, DOI: 10.1080/09720502.2021.189344
d-To-1 Hardness of Coloring 3-Colorable Graphs with O(1) Colors
No full textThe d-to-1 conjecture of Khot asserts that it is NP-hard to satisfy an ε fraction of constraints of a satisfiable d-to-1 Label Cover instance, for arbitrarily small ε > 0. We prove that the d-to-1 conjecture for any fixed d implies the hardness of coloring a 3-colorable graph with C colors for arbitrarily large integers C.
Earlier, the hardness of O(1)-coloring a 4-colorable graphs is known under the 2-to-1 conjecture, which is the strongest in the family of d-to-1 conjectures, and the hardness for 3-colorable graphs is known under a certain "fish-shaped" variant of the 2-to-1 conjecture
Acquisition of adjective meanings : a lexical semantic approach
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 1992.Includes bibliographical references (p. 115-119).by Sandeep Prasada.Ph.D
Hardy–Sobolev extremals, hyperbolic symmetry and scalar curvature equations
No full texta b s t r a c t
Article history:
Received 16 April 2008
Revised 5 September 2008
Available online 22 October 2008
MSC:
primary 35J60
secondary 35B05, 35A15
We prove nondegeneracy of extremals for some Hardy–Sobolev–
Maz’ya inequalities and present applications to scalar curvaturetype
problems, including the Webster scalar curvature equation in
a cylindrically symmetric setting. The main theme is hyperbolic
symmetry.
© 2008 Elsevier Inc. All rights reserved
Morphological and genetic variation in populations of Sitana marudhamneydhal and the validity of Sitana attenboroughii
No full textBalan, A., Jude, D., Narayanan, Surya, Varma, Sandeep, Deepak, V. (2021): Morphological and genetic variation in populations of Sitana marudhamneydhal and the validity of Sitana attenboroughii. Zootaxa 4964 (3): 523-540, DOI: https://doi.org/10.11646/zootaxa.4964.3.
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
FIGURE 2 in Rediscovery of Liara (Unalianus) heteracanthus (Redtenbacher, 1891) (Orthoptera: Tettigoniidae: Conocephalinae: Agraeciini) from India with notes on its distribution
No full textFIGURE 2. Liara (Unalianus) heteracanthus (Redtenbacher, 1891) (Male). A—Head & pronotum, dorsal view. B—Frons. C—Head & pronotum, lateral view. D—Sternum, ventral view. E—Abdominal apex, dorsal view. F—Abdominal apex, apical view. G—Abdominal apex, ventral view. H—Fore leg, ventral view. I—Fore tibia, dorsal view. J—Middle leg, ventral view. K—Hind femur, ventral view. L—Hind tibia, dorsal view.Published as part of Kumar, Hirdesh, Kushwaha, Sandeep & Chand, D. Suresh, 2021, Rediscovery of Liara (Unalianus) heteracanthus (Redtenbacher, 1891) (Orthoptera: Tettigoniidae: Conocephalinae: Agraeciini) from India with notes on its distribution, pp. 166-170 in Zootaxa 5020 (1) on page 169, DOI: 10.11646/zootaxa.5020.1.8, http://zenodo.org/record/522313
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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