131,378 research outputs found
Common fixed points of Ciric-type contractions on partial metric spaces
No full textWe obtain a common fixed point theorem of Boyd-Wong type for four mappings satisfying a Ciric-type contraction on a complete partial metric space. Our result generalizes and unifies, among others, the very recent results of L. CIRIC, B. SAMET, H. AYDI and C. VETRO [Common fixed points of generalized contractions on partial metric spaces and an application, Appl. Math. Comput., 218 (2011), 2398-2406], S. ROMAGUERA [Fixed point theorems for generalized contractions on partial metric spaces, Topology Appl., 159 (2012), 194-199], T. ABDELJAWAD, E. KARAPINAR and K. TAS [Existence and uniqueness of a common fixed point on partial metric spaces, Appl. Math. Lett. 24 (2011), 1900-1904], and D. ILIC, V. PAVLOVIC and V. RAKOCEVIC [Some new extensions of Banach's contraction principle to partial metric space, Appl. Math. Lett. 24 (2011), 1326-1330].The third named author is supported by the Ministry of Science and Innovation of Spain, grant MTM2009-12872-C02-01.Abbas, M.; Altun, I.; Romaguera Bonilla, S. (2013). Common fixed points of Ciric-type contractions on partial metric spaces. Publicationes Mathematicae Debrecen. 82:425-438. https://doi.org/10.5486/PMD.2013.5342S4254388
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
"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.
Revisiting Ciric type nonunique fixed point theorems via interpolation
No full text[EN] In this paper, we aim to revisit some non-unique fixed point theorems
that were initiated by Ciric, first. We consider also some natural consequences of the obtained results. In addition, we provide a simple
example to illustrate the validity of the main result.Karapinar, E. (2021). Revisiting Ciric type nonunique fixed point theorems via interpolation. Applied General Topology. 22(2):483-496. https://doi.org/10.4995/agt.2021.16562OJS483496222J. Achari, On Ćirić's non-unique fixed points, Mat. Vesnik 13 (28), no. 3 (1976), 255-257.H. Afshari, H. Aydi and E. Karapinar, On generalized α-ψ-Geraghty contractions on b-metric spaces, Georgian Math. J. 27 (2020), 9-21. https://doi.org/10.1515/gmj-2017-0063H. Afshari, H. Aydi and E. Karapinar, Existence of fixed points of set-valued mappings in b-metric spaces, East Asian Mathematical Journal 32, no. 3 (2016), 319-332. https://doi.org/10.7858/eamj.2016.024R. P. Agarwal and E. Karapinar, Interpolative Rus-Reich-Ciric type contractions via simulation functions, An. St. Univ. Ovidius Constanta, Ser. Mat. 27, no. 3 (2019), 137-152. https://doi.org/10.2478/auom-2019-0038U. Aksoy, E. Karapinar and I. M. Erhan, Fixed points of generalized alpha-admissible contractions on b-metric spaces with an application to boundary value problems, Journal of Nonlinear and Convex Analysis 17, no. 6 (2016), 1095-1108.H. Alsulami, S. Gulyaz, E. Karapinar and I. Erhan, An Ulam stability result on quasi-b-metric-like spaces, Open Mathematics 14, no. 1 (2016), 1087-1103. https://doi.org/10.1515/math-2016-0097M. A. Alghamdi, S. Gulyaz-Ozyurt and E. Karapinar, A note on extended Z-contraction, Mathematics 8, no. 2 (2020), 195. https://doi.org/10.3390/math8020195H. Aydi, C.-M. Chen and E. Karapinar, Interpolative Ciric-Reich-Rus type contractions via the Branciari distance, Mathematics 7, no. 1 (2019), 84. https://doi.org/10.3390/math7010084H. Aydi, E. Karapinar and A. F. Roldán López de Hierro, ω-Interpolative Ćirić-Reich-Rus-type contractions, Mathematics 7 (2019), 57. https://doi.org/10.3390/math7010057H. Aydi, M. F. Bota, E. Karapinar and S. Moradi, A common fixed point for weak phi-contractions on b-metric spaces, Fixed Point Theory 13, no. 2 (2012), 337-346. https://doi.org/10.1186/1687-1812-2012-44H. Aydi, E. Karapinar, M. F. Bota and S. Mitrovic, A fixed point theorem for set-valued quasi-contractions in b-metric spaces, Fixed Point Theory Appl. 2012, 2012:88. https://doi.org/10.1186/1687-1812-2012-88V. Berinde, Contracţii Generalizate şi Aplicaţii , Vol. 2, Editura Cub Press, Baie Mare, Romania, 1997.V. Berinde, Sequences of operators and fixed points in quasimetric spaces, Mathematica 41, no. 4 (1996), 23-27.V. Berinde, Generalized contractions in quasi-metric spaces, Seminar on Fixed Point Theory, Babeş-Bolyai University, Research Sem., (1993), 3-9.C. Chifu, E. Karapinar and G. Petrusel, Fixed point results in ε-chainable complete b-metric spaces, Fixed Point Theory 21, no. 2 (2020), 453-464. https://doi.org/10.24193/fpt-ro.2020.2.32L. B. Ćirić, On some maps with a nonunique fixed point, Publ. Inst. Math. 17 (1974), 52-58.S. Czerwik, Contraction mappings in -metric spaces, Acta Math. et Inf. Uni. Ostraviensis 1 (1993), 5-11.A. Fulga, E. Karapinar and G. Petrusel, On hybrid contractions in the context of quasi-metric spaces, Mathematics 8 (2020), 675. https://doi.org/10.3390/math8050675Y. U. Gaba and E. Karapinar, A new approach to the interpolative contractions, Axioms 2019, 8, 110. https://doi.org/10.3390/axioms8040110S. Gulyaz-Ozyurt, On some alpha-admissible contraction mappings on Branciari b-metric spaces, Advances in the Theory of Nonlinear Analysis and its Applications 1 (2017), 1-13. https://doi.org/10.31197/atnaa.318445S. Gupta and B. Ram, Non-unique fixed point theorems of Ćirić type, (Hindi) Vijnana Parishad Anusandhan Patrika 41, no. 4 (1998), 217-231.R. Kannan, Some results on fixed points, Bull. Calcutta Math. Soc. 60 (1968), 71-76. https://doi.org/10.2307/2316437E. Karapinar, A new non-unique fixed point theorem, J. Appl. Funct. Anal. 7, no. 1-2 (2012), 92-97. https://doi.org/10.1186/1687-1812-2012-194E. Karapinar, Some nonunique fixed point theorems of Ćirić type on cone metric spaces, Abstr. Appl. Anal. 2010 (2010), Article ID 123094. https://doi.org/10.1155/2010/123094E. Karapinar, Ciric type nonunique fixed points results: a review, Applied and Computational Mathematics an International Journal 1 (2019), 3-21.E. Karapinar, O. Alqahtani and H. Aydi, On interpolative Hardy-Rogers type contractions, Symmetry 11, no. 1 (2019), 8. https://doi.org/10.3390/sym11010008E. Karapinar, Revisiting the Kannan type contractions via interpolation, Adv. Theory Nonlinear Anal. Appl. 2, no. 2 (2018), 85-87. https://doi.org/10.31197/atnaa.431135E. Karapinar, H. Aydi and Z. D. Mitrovic, On interpolative Boyd-Wong and Matkowski type contractions, TWMS J. Pure Appl. Math. 11, no. 2 (2020), 204-212.E. Karapinar, R. Agarwal and H. Aydi, Interpolative Reich-Rus-Ćirić type contractions on partial metric spaces, Mathematics 6, no. 11 (2018), 256. https://doi.org/10.3390/math6110256E. Karapinar, A. Fulga and A. Petrusel, On Istratescu type contractions in -metric spaces, Mathematics 8, no. 3 (2020), 388. https://doi.org/10.3390/math8030388E. Karapinar, A short survey on the recent fixed point results on -metric spaces, Constructive Mathematical Analysis 1, no. 1 (2018), 15-44. https://doi.org/10.33205/cma.453034E. Karapinar and C. Chifu, Results in wt-distance over -metric spaces, Mathematics 8, no. 2 (2020), 220. https://doi.org/10.3390/math8020220E. Karapinar and A. Fulga, Fixed point on convex -metric space via admissible mappings, TWMS JPAM 12, no. 2 (2021). https://doi.org/10.1155/2021/5538833E. Karapinar, Interpolative Kannan-Meir-Keeler type contraction, Adv. Theory Nonlinear Anal. 5, no. 4 (2021), 611-614. https://doi.org/10.31197/atnaa.989389Z. Liu, Z. Guo, S. M. Kang and S. K. Lee, On Ćirić type mappings with nonunique fixed and periodic points, Int. J. Pure Appl. Math. 26, no. 3 (2006), 399-408.Z. Q. Liu, On Ćirić type mappings with a nonunique coincidence points, Mathematica (Cluj) 35(58), no. 2 (1993), 221-225.B. G. Pachpatte, On Ćirić type maps with a nonunique fixed point, Indian J. Pure Appl. Math. 10, no. 8 (1979), 1039-1043.I. A. Rus, Generalized Contractions and Applications, Cluj University Press, Cluj-Napoca, Romania, 2001
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Scholarly Communication and Publishing Lunch and Learn Talk #11: The ULS Open Access Author Fee Fund
No full textAt the May 2014 talk, you will learn about the ULS Open Access Author Fee Fund--what it is, why we do it, how it works, and how the program is going so far
The R&D Tax Incentives
No full textThis article sets out some background information and reflections of the author on the R&D tax incentive schemes included in the Common Corporate Tax Base (CCTB) Proposal. In particular the author analyzes the stimulus to private R&D through ad hoc tax incentives included in the CCTB Proposal and dives into the actual provisions included in the Proposal highlighting the most relevant issues connected with their design and interpretation. Moreover, the author explores the interaction between the CCTB Proposal and the granting by Member States of domestic R&D tax incentives
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