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Letteratura scientifica selezionata sul tema "Shannonův index"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 5 febbraio 2022

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Articoli di riviste sul tema "Shannonův index"

Konopiński, Maciej K. "Shannon diversity index: a call to replace the original Shannon’s formula with unbiased estimator in the population genetics studies." PeerJ 8 (June 29, 2020): e9391. http://dx.doi.org/10.7717/peerj.9391.

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Background The Shannon diversity index has been widely used in population genetics studies. Recently, it was proposed as a unifying measure of diversity at different levels—from genes and populations to whole species and ecosystems. The index, however, was proven to be negatively biased at small sample sizes. Modifications to the original Shannon’s formula have been proposed to obtain an unbiased estimator. Methods In this study, the performance of four different estimators of Shannon index—the original Shannon’s formula and those of Zahl, Chao and Shen and Chao et al.—was tested on simulated

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Liang, Naixin, Si Chen, Yuting Yi, Yan-Fang Guan, Xuefeng Xia, and Xin Yi. "Characteristics of T-cell receptor repertoire between lung cancer patients and healthy people." Journal of Clinical Oncology 37, no. 15_suppl (2019): e20728-e20728. http://dx.doi.org/10.1200/jco.2019.37.15_suppl.e20728.

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e20728 Background: Deep sequencing studies on T cell receptor (TCR) repertoire have provided a wealth of information, such as immune status, virus infection history and so on. As we all known, the thymus begins to involute at the time of birth, so does the immune system. We can use TCR sequence to describe changes in human’s immune system with age, the difference between males and females and immune stat of cancers. Methods: We analyzed TCRβrepertoire in 334 healthy individuals without cancer, aged 2–83 years, and 207 lung cancers. In detail, genomic DNA was extracted from peripheral blood and

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Guiaşu, Radu Cornel, and Silviu Guiaşu. "Conditional and Weighted Measures of Ecological Diversity." International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 11, no. 03 (2003): 283–300. http://dx.doi.org/10.1142/s0218488503002089.

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Shannon's entropy and Simpson's index are the most used measures of species diversity. As the Simpson index proves to be just an approximation of the Shannon entropy, conditional Simpson indices of diversity and a global measure of interdependence among species are introduced, similar to those used in the corresponding entropic formalism from information theory. Also, since both the Shannon entropy and the Simpson index depend only on the number and relative abundance of the respective species in a given ecosystem, the paper generalizes these indices of diversity to the case when a numerical w

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Levykh, Alyona Yuryevna, and Stepan Leonidovich Boldyrev. "Structure and factors of forest birds diversity forming in the Ishim river area (Russia)." Samara Journal of Science 7, no. 2 (2018): 81–87. http://dx.doi.org/10.17816/snv201872116.

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The paper studies the relationship between specific parameters of habitats (the forest area along the route, the average age of the forest, the closure of the crowns, the condition of the crowns, the type of anthropogenic impact, the stage of vegetative succession, the wetting of the forest), the abundance of birds, Shannon and Simpsons indices of the species diversity of forest ornithocenosis. This study is based on the materials of field bird records conducted in the seasons of 2014-2016 on 28 permanent routes in the forest habitats of the Ishim River area (Russia). A statistically significa

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Łagód, Grzegorz, Mariola Chomczyńska, Agnieszka Montusiewicz, Jacek Malicki, and David Stransky. "Methods Applied for Measurement and Visualization of Changes in Biodiversity." Ecological Chemistry and Engineering S 21, no. 4 (2015): 593–604. http://dx.doi.org/10.1515/eces-2014-0042.

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Abstract The article presents the possible methods for determining biological or statistically significant differences between taxocenoses compared with respect to biodiversity. To obtain a complete description of biological differences between the compared hypothetical communities, the following indices were calculated: S (taxon richness), H (the Shannon index), Hmax (the maximum value of the Shannon index for the richness of taxa represented by the same number of individuals), Vd (a percentage value of covering the structural capacity of community, “evenness deficiency”), E (the MacArthur in

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Cano Ortiz, Ana, Carmelo Maria Musarella, Carlos José Pinto Gomes, Ricardo Quinto Canas, José Carlos Piñar Fuentes, and Eusebio Cano. "Phytosociological Study, Diversity and Conservation Status of the Cloud Forest in the Dominican Republic." Plants 9, no. 6 (2020): 741. http://dx.doi.org/10.3390/plants9060741.

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The study of the forest in rainy environments of the Dominican Republic reveals the presence of four types of vegetation formations, clearly differentiated from each other in terms of their floristic and biogeographical composition, and also significantly different from the rainforests of Cuba. This leads us to propose two new alliances and four plant associations located in northern mountain areas exposed to moisture-laden winds from the Atlantic: All. Rondeletio ochraceae-Clusion roseae (Ass. Cyatheo furfuracei-Prestoetum motanae; Ass. Ormosio krugii-Prestoetum montanae); and All. Rondeletio

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Sherwin, William B., and Narcis Prat i Fornells. "The Introduction of Entropy and Information Methods to Ecology by Ramon Margalef." Entropy 21, no. 8 (2019): 794. http://dx.doi.org/10.3390/e21080794.

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In ecology and evolution, entropic methods are now used widely and increasingly frequently. Their use can be traced back to Ramon Margalef’s first attempt 70 years ago to use log-series to quantify ecological diversity, including searching for ecologically meaningful groupings within a large assemblage, which we now call the gamma level. The same year, Shannon and Weaver published a generally accessible form of Shannon’s work on information theory, including the measure that we now call Shannon–Wiener entropy. Margalef seized on that measure and soon proposed that ecologists should use the Sha

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Agbelade, Aladesanmi D., Jonathan C. Onyekwelu, and Matthew B. Oyun. "Tree Species Richness, Diversity, and Vegetation Index for Federal Capital Territory, Abuja, Nigeria." International Journal of Forestry Research 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/4549756.

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This study was conducted to investigate the tree species richness and diversity of urban and periurban areas of the Federal Capital Territory (FCT), Abuja, Nigeria, and produce Normalized Difference Vegetation Index (NDVI) for the territory. Data were collected from urban (Abuja city) and periurban (Lugbe) areas of the FCT using both semistructured questionnaire and inventory of tree species within green areas. In the study location, all trees with diameter at breast height (dbh) ≥ 10 cm were identified; their dbh was measured and frequency was taken. The NDVI was calculated in ArcGIS 10.3 env

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Dvořák, Tomáš. "Chromatic Index of Hypergraphs and Shannon’s Theorem." European Journal of Combinatorics 21, no. 5 (2000): 585–91. http://dx.doi.org/10.1006/eujc.1999.0388.

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Straathof, Sebastiaan M. "Shannon's entropy as an index of product variety." Economics Letters 94, no. 2 (2007): 297–303. http://dx.doi.org/10.1016/j.econlet.2006.08.030.

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Tesi sul tema "Shannonův index"

SANTOS, Vanessa Kelly dos. "Uma generalização da distribuição do índice de diversidade generalizada por Good com aplicação em Ciências Agrárias." Universidade Federal Rural de Pernambuco, 2009. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5372.

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Submitted by (ana.araujo@ufrpe.br) on 2016-08-17T12:42:21Z No. of bitstreams: 1 Vanessa Kelly dos Santos.pdf: 364306 bytes, checksum: 6c79d0925f6821655f91bcd3c8eb64af (MD5) Made available in DSpace on 2016-08-17T12:42:21Z (GMT). No. of bitstreams: 1 Vanessa Kelly dos Santos.pdf: 364306 bytes, checksum: 6c79d0925f6821655f91bcd3c8eb64af (MD5) Previous issue date: 2009-03-23 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES Diversity as a concept was first introduced by Williams in Fisher et al. (1943). Later, Good (1953, 1982) proposed a generalized index that

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Chima, C. I. "Monitoring and modelling of urban land use in Abuja Nigeria, using geospatial information technologies." Thesis, Coventry University, 2012. http://curve.coventry.ac.uk/open/items/286e264c-3d26-4448-8049-6f2ef3fda727/1.

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This thesis addresses three research gaps in published literature. These are, the absence of Object Based Image Analysis (OBIA) methods for urban Land Use and Land Cover (LULC) analysis in Nigeria; the inability to use Nigeriasat-1 satellite data for urban LULC analysis and monitoring urban growth in Nigeria with Shannon’s Entropy Index. Using Abuja as a case study, this research investigated the nature of land use/land cover change (LULCC). Specific objectives were: design of an object based classification method to extract urban LULC; validate a method to extract LULC in developing countries

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Shevtsova, Galina. "Catálisis: an integrated approach. R.A. van Santen, P.W.N.M. van Leeuwen, J.A. Moulijn, B.A. Averill, editores. Elsevier, Amsterdam-Lausanne-New York-Oxford-Shannon-Singapure-Tokyo, 1999." Revista de Química, 2013. http://repositorio.pucp.edu.pe/index/handle/123456789/99309.

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Rossi, Guilherme Ebling. "Avaliação da dinâmica e da diversidade de uma pastagem natural submetida a diferentes distúrbios." Universidade Federal de Santa Maria, 2009. http://repositorio.ufsm.br/handle/1/10731.

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Dynamics of species, families and plant functional types (PFTs), and diversity of a natural grassland submitted or not to burning and grazing, in different relief positions (concave a convex slope) were evaluated. Treatments consisted of the associations of those three factors, in a completely randomized design, with variable number of replicates, from two to five. Rotational grazing were used, with an average occupation period of six days. Grazing animals were from Nelore, Charolais and its crosses. Stocking rate was calculated to obtain between 20 to 35 % of disappearing of forage mass. Dive

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Baldow, Christoph, Lars Thielecke, and Ingmar Glauche. "Model Based Analysis of Clonal Developments Allows for Early Detection of Monoclonal Conversion and Leukemia." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-221771.

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The availability of several methods to unambiguously mark individual cells has strongly fostered the understanding of clonal developments in hematopoiesis and other stem cell driven regenerative tissues. While cellular barcoding is the method of choice for experimental studies, patients that underwent gene therapy carry a unique insertional mark within the transplanted cells originating from the integration of the retroviral vector. Close monitoring of such patients allows accessing their clonal dynamics, however, the early detection of events that predict monoclonal conversion and potentially

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Washburn, Stephen Jackson. "The Epiphytic Macrolichens of the Greater Cincinnati, Ohio, Metropolitan Area." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1133992448.

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Baldow, Christoph, Lars Thielecke, and Ingmar Glauche. "Model Based Analysis of Clonal Developments Allows for Early Detection of Monoclonal Conversion and Leukemia." Public Library of Science, 2016. https://tud.qucosa.de/id/qucosa%3A30226.

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Boavista, Lidiane da Rosa. "ESTUDO DE COMUNIDADES VEGETAIS CAMPESTRES NA REGIÃO DO ALTO CAMAQUÃ, RIO GRANDE DO SUL." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/4846.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico Understanding the dynamics of vegetation could facilitate decision making and adoption of new management practices, seeking a better use of available resources in areas of natural grassland. This study aimed to evaluate the dynamics of a natural grassland vegetation subject to grazing and fertilization, in four different locations in the counties of Pinheiro Machado and Piratini, located in the upper basin region of Rio Camaquã. The treatments were a combination of the above factors. The estimation of species composition and biom

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Sousa, Ulysses Santos. "CLASSIFICAÇÃO DE MASSAS NA MAMA A PARTIR DE IMAGENS MAMOGRÁFICAS USANDO ÍNDICE DE DIVERSIDADE DE SHANNON-WIENER." Universidade Federal do Maranhão, 2011. http://tedebc.ufma.br:8080/jspui/handle/tede/467.

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Made available in DSpace on 2016-08-17T14:53:17Z (GMT). No. of bitstreams: 1 Ulysses Santos Sousa.pdf: 1410915 bytes, checksum: 88235f7f4a3bc07a4da1b27c23dc71ca (MD5) Previous issue date: 2011-05-13 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Cancer is one of the biggest health problems worldwide, and the breast cancer is the one that causes more deaths among women. Also it is the second most frequent type in the world. The chances of survival for a patient with breast cancer increases the sooner this disease is discovered. Several Computer Aided Detection/Diagnosis S

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Hoare, Armando. "Parametric, non-parametric and statistical modeling of stony coral reef data." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002470.

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Libri sul tema "Shannonův index"

Mirowski, Philip, and Edward Nik-Khah. Three Different Modalities of Information in Neoclassical Theory. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780190270056.003.0008.

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There were eventually three major formats explored by the Cowles economists in their quest to incorporate information into the existing neoclassical model: information as thing, information as inductive index, and information as symbolic computation. We describe the major ways they differed from one another, comparing the inspirational views of Claude Shannon, David Blackwell, and Alan Turing. Further, each came with its own characteristic mathematical formalism, not easily reconciled with prior microeconomics, which tended to be irreducible to the other candidates.

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Capitoli di libri sul tema "Shannonův index"

Ortiz-Burgos, Selene. "Shannon-Weaver Diversity Index." In Encyclopedia of Estuaries. Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-8801-4_233.

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Leijon, Arne. "Articulation Index and Shannon Mutual Information." In Hearing – From Sensory Processing to Perception. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-73009-5_56.

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Allen, Jont B. "The Articulation Index is a Shannon channel capacity." In Auditory Signal Processing. Springer New York, 2005. http://dx.doi.org/10.1007/0-387-27045-0_39.

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Soukoreff, R. William, Jian Zhao, and Xiangshi Ren. "The Entropy of a Rapid Aimed Movement: Fitts’ Index of Difficulty versus Shannon’s Entropy." In Human-Computer Interaction – INTERACT 2011. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23768-3_19.

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López-García, Hortensia, and M. Amparo Gil-Martín. "The Additively Decomposable Fuzzy Shannon Type Inequality Index for Positive Random Fuzzy Numbers." In Studies in Systems, Decision and Control. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73848-2_59.

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"Shannon-Weaver Index." In Encyclopedia of Genetics, Genomics, Proteomics and Informatics. Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6754-9_15524.

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Spellerberg, I. F. "Shannon–Wiener Index." In Encyclopedia of Ecology. Elsevier, 2008. http://dx.doi.org/10.1016/b978-008045405-4.00132-4.

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Fedor, P. J., and I. F. Spellerberg. "Shannon–Wiener Index." In Reference Module in Earth Systems and Environmental Sciences. Elsevier, 2013. http://dx.doi.org/10.1016/b978-0-12-409548-9.00602-3.

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"Shannon-Weiner Index Example." In Paradigms Lost. Elsevier, 2006. http://dx.doi.org/10.1016/b978-075067888-9/50025-9.

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"Diversity (Shannon–Weaver index)." In Encyclopedia of Genetics, Genomics, Proteomics and Informatics. Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6754-9_4594.

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Atti di convegni sul tema "Shannonův index"

Jalil, Wan Aznie Fatihah Wan Abd, and Shamshuritawati Sharif. "Development of Malaysian women fertility index: Evidence from Shannon’s entropy." In PROCEEDINGS OF THE 13TH IMT-GT INTERNATIONAL CONFERENCE ON MATHEMATICS, STATISTICS AND THEIR APPLICATIONS (ICMSA2017). Author(s), 2017. http://dx.doi.org/10.1063/1.5012241.

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BAEZA, JESÚS LÓPEZ, DAMIANO CERRONE, and KRISTJAN MÄNNIGO. "COMPARING TWO METHODS FOR URBAN COMPLEXITY CALCULATION USING THE SHANNON-WIENER INDEX." In SUSTAINABLE DEVELOPMENT AND PLANNING 2017. WIT Press, 2017. http://dx.doi.org/10.2495/sdp170321.

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Boutheyna, Touafchia, Kadi Zahia, Redjaimia Lilia, and Rached-Kanouni Malika. "STRUCTURAL AND FLORISTIC CHARACTERIZATION OF THE OULED BECHIH FOREST (ALGERIA)." In GEOLINKS Conference Proceedings. Saima Consult Ltd, 2021. http://dx.doi.org/10.32008/geolinks2021/b2/v3/22.

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The objective of this study is the rational management of forest ecosystems for sustainable conservation of floristic biodiversity. Two types of analysis are carried out: structural analysis and analysis of the main species. A total of 22 families were identified, divided among 32 species. The dominant woody species are Quercus suber and Quercus canariensis. Fagaceae is the most represented family. The average values of species richness and Shannon diversity index are 4 ± 1.8 and 0.9 ± 0.30 species/plot respectively. The average density of woody species in the Oueld Bechih forest was 158 ± 28

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Pukowiec-Kurda, Katarzyna, and Urszula Myga-Piatek. "Application of New Methods of Environment Analysis and Assessment in Landscape Audits – Case Studies of Urban Areas Like Czestochowa, Poland." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.116.

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Following the 2000 European Landscape Convention, a new act strengthening landscape protection instruments has been in force since 2015. It sets forth legal aspects of landscape shaping (Dziennik Ustaw 2015, poz. 774) and introduces landscape audits at the province level. A landscape audit consists in identification and characterization of selected landscapes, assessment of their value, selection of so-called priority landscapes and identification of threats for preservation of their value. An audit complies with GIS standards. Analyses use source materials, i.e. digital maps of physical-geogr

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Alia, Zerrouki, Kara Karima, Redjaimia Lilia, and Rached-Kanouni Malika. "FLORISTIC DIVERSITY AND STRUCTURAL CHARACTERIZATION OF THE FOREST OF CHETTABA (ALGERIA)." In GEOLINKS Conference Proceedings. Saima Consult Ltd, 2021. http://dx.doi.org/10.32008/geolinks2021/b2/v3/12.

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"The structure of various stands, defined as the diversity of trees in the stands, can be an indication of overall biodiversity and habitat suitability, be useful in predicting stand growth and provide stand details for forest inventories. In an effort to find sustainable resource management strategies, a study was conducted on the structural and ecological characteristics of stands in Chettaba forest (Algeria). In this study, six diversity indices were used to characterize the horizontal and spatial distribution of individuals in multi-species stands, using four plots, located in the Chettaba

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Rapporti di organizzazioni sul tema "Shannonův index"

Havrlant, David, and Abdulelah Darandary. Economic Diversification under Saudi Vision 2030. King Abdullah Petroleum Studies and Research Center, 2021. http://dx.doi.org/10.30573/ks--2021-dp06.

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The last decade has brought a row of substantial changes that have profound implications for the traditional hydrocarbon resource-rich economies. Economic conditions may change radically either throughout a decade or within months. The question is whether there is no other option for a hydrocarbon resource-rich economy than to be held hostage to the fluctuations in global oil prices. The general answer to a changing environment is: Adapt! From the macroeconomic perspective, this means diversifying the economy to broaden the income base and significantly reduce the dependence on oil revenues. T

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