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This thesis combines behavioral and cognitive approaches regarding the Web for analyzing users' behavior and supposed interests.
The work is placed in a new field of research called Web Science, which includes, but is not restricted to, the analysis of the World Wide Web. The term Web Science is affected by Tim Berners-Lee et al., who invited the researchers to "create a science of the web" [BLHH+06a]. The thesis is structured in two parts, reflecting the intersection of disciplines that is required for Web Science.
The first part is related to computer science and information systems. This part defines the Gugubarra concepts and algorithms for web user profiling and builds upon the results by Mushtaq et al. [MWTZ04]. This profiling aims at understanding the behavior and supposed interests of users. Based on these concepts, a framework was implemented to support the needs of web site owners. The core technologies used are Java, Spring, Hibernate, and content management systems. The design principles, architecture, implementation, and tests of the prototype are reported.
The second part is directly related to behavioral economics and is connected to the areas of economics, mathematics, and psychology. This part contributes to behavior models, as was claimed by Tim Berners-Lee et al.: "Though individual users may or may not be rational, it has long been noted that en masse people behave as utility maximisers. In that case, understanding the incentives that are available to web users should provide methods for generating models of behaviour..."[BLHH+06b]. The focus here is on studies that investigate the user's choice of online information services in a multi-attribute context. The introduced research framework takes into account background and local context effects and builds upon theoretical foundations by Tversky and Kahneman [TK86]. The findings provide useful insights to behavioral scientists and to practitioners on how to use framing strategies to alter the user's choice.
The species of Phalacridae (Coleoptera) historically included in Leptostilbus Casey, 1916, are reviewed.
Leptostilbus rutilans Casey, 1916, is here designated as the type species of Leptostilbus. The genus Leptostilbus is
synonymized with Xanthocomus Guillebeau, 1893, syn. nov., resulting in two new combinations, Xanthocomus
concinnus (Casey, 1916) and X. rutilans (Casey, 1916). Lectotypes are here designated for these two species.
Acylomus elongatulus (Casey, 1890), comb. nov., formerly placed in Leptostilbus, is excluded from Xanthocomus.
A key and illustrations are provided to aid in recognition of the two species of Xanthocomus in North America, and
detailed distribution maps are given for both species.
Three new species of the caddisfly genus Goera Stephens (Trichoptera: Goeridae) are described from
the Indonesian island of Sulawesi. Goera neboissi sp. n., G. jolanda sp. n., and G. higleri sp. n. were found to be related
to G. skiasma Neboiss, which is the only previously recorded species from Sulawesi. These species share the
following combination of characters: an upright IXth segment; the absence of the median dorsal process of tergum X;
a long, mesal process of the inferior appendage with a subbasal projection; and, the absence of parameres.
Cithaeron praedonius O. P.-Cambridge 1872 (Araneae: Gnaphosoidea: Cithaeronidae) is an Old World species with a distribution from The Gambia, western Africa, and Greece to Malaysia and Australia. In the New World, it was recently found in Brazil, and is now reported for the first time in North America, in the United States. Multiple individuals of both sexes and various life stages, including multiple eggsacs, have been found in a home in Port Richey, Pasco County, Florida. An adult female was found on the outside wall of the house feeding on another spider, suggesting that C. praedonius are no longer contained as a spot introduction in this one house. Observations in captivity indicate that this species may prefer feeding on other spiders. The eggsac and molting nest are described for the first time, and the first records on fecundity are reported.
The brachypterous Brazilian stag beetle genus Altitatiayus Weinreich (Coleoptera, Lucanidae, Lucaninae)
was previously known only from states of Minas Gerais and Rio de Janeiro. Altitatiayus campoi, a new species
from São Paulo, the southernmost in distribution, is described here and apparently represents a new species group
with some exclusive characters. It is compared with other species of the genus and a key to species of Altitatiayus is
provided.
A Bayesian framework to estimate diversification rates and their variation through time and space
(2011)
Background: Patterns of species diversity are the result of speciation and extinction processes, and molecular phylogenetic data can provide valuable information to derive their variability through time and across clades. Bayesian Markov chain Monte Carlo methods offer a promising framework to incorporate phylogenetic uncertainty when estimating rates of diversification.
Results: We introduce a new approach to estimate diversification rates in a Bayesian framework over a distribution of trees under various constant and variable rate birth-death and pure-birth models, and test it on simulated phylogenies. Furthermore, speciation and extinction rates and their posterior credibility intervals can be estimated while accounting for non-random taxon sampling. The framework is particularly suitable for hypothesis testing using Bayes factors, as we demonstrate analyzing dated phylogenies of Chondrostoma (Cyprinids) and Lupinus (Fabaceae). In addition, we develop a model that extends the rate estimation to a meta-analysis framework in which different data sets are combined in a single analysis to detect general temporal and spatial trends in diversification.
Conclusions: Our approach provides a flexible framework for the estimation of diversification parameters and hypothesis testing while simultaneously accounting for uncertainties in the divergence times and incomplete taxon sampling.
Vortrag im Rahmen des Symposiums der Universitätsbibliothek Frankfurt am Main in Kooperation mit der Frankfurter Buchmesse 2011 "Economy and Acceptance of Open Access Strategies", am 14.10.2011.
Vortrag im Rahmen des Symposiums der Universitätsbibliothek Frankfurt am Main in Kooperation mit der Frankfurter Buchmesse 2011 "Economy and Acceptance of Open Access Strategies", am 14.10.2011.
Vortrag im Rahmen des Symposiums der Universitätsbibliothek Frankfurt am Main in Kooperation mit der Frankfurter Buchmesse 2011 "Economy and Acceptance of Open Access Strategies", am 14.10.2011.