Dissertations / Theses on the topic 'Contextual search'
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Lakshmanan, Hariharan 1980. "A client side tool for contextual Web search." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/29385.
Full textIncludes bibliographical references (p. 76-77).
This thesis describes the design and development of an application that uses information relevant to the context of a web search for the purpose of improving the search results obtained using standard search engines. The representation of the contextual information is based on a Vector Space Model and is obtained from a set of documents that have been identified as relevant to the context of the search. Two algorithms have been developed for using this contextual representation to re-rank the search results obtained using search engines. In the first algorithm, re-ranking is done based on a comparison of every search result with all the contextual documents. In the second algorithm, only a subset of the contextual documents that relate to the search query is used to measure the relevance of the search results. This subset is identified by mapping the search query onto the Vector Space representation of the contextual documents. A software application was developed using the .NET framework with C# as the implementation language. The software has functionality to enable users to identify contextual documents and perform searches either using a standard search engine or using the above-mentioned algorithms. The software implementation details, and preliminary results regarding the efficiency of the proposed algorithms have been presented.
by Hariharan Lakshmanan.
S.M.
Limbu, Dilip Kumar. "Contextual information retrieval from the WWW." Click here to access this resource online, 2008. http://hdl.handle.net/10292/450.
Full textFiske, Steven William. "Does Crowding Obscure the Presence of Attentional Guidance in Contextual Cueing?" Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4039.
Full textKarlsson, Michael. "Bathroom Hideouts : A search for new ways of storing." Thesis, Linnéuniversitetet, Institutionen för design, DE, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-14163.
Full textZhang, Limin. "Contextual Web Search Based on Semantic Relationships: A Theoretical Framework, Evaluation and a Medical Application Prototype." Diss., Tucson, Arizona : University of Arizona, 2006. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1602%5F1%5Fm.pdf&type=application/pdf.
Full textChimfwembe, Richard. "Pastoral care in a context of poverty : a search for a Zambian contextual church response." Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/40203.
Full textThesis (PhD)--University of Pretoria, 2013.
gm2014
Practical Theology
unrestricted
Poulet, Sarah. "Contextual Cueing : apprentissage des régularités spatiales de l’environnement au cours de la recherche visuelle et accès conscient aux connaissances." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCC027.
Full textWhile deeply complex, the visual world is highly structured and redundant. Through experience, human beings can thus learn regularities present in the visual world, and exploit them to deal with information overload and facilitate behaviors. For the past twenty years, the Contextual Cueing (CC) paradigm has provided an experimental tool to study, in the laboratory, how spatial regularities can be learned to expedite visual search. The first part of this dissertation reviews the existing literature related to this paradigm. It mainly discusses the implicit nature of CC, the characterization of the acquired knowledge and its facilitating effect, as well as the generalization of spatial CC to other regularities and environments. In a second part, three experimental studies using the CC paradigm are presented. The first one shows that, in natural scenes, the acquisition of implicit knowledge tends to precede the conscious exploitation of regularities that classically accompanies CC in this type of environment. In artificial scenes (i.e., letter configurations), even if CC does not seem to primarily depend on the proper implementation of explicit and conscious processes, our second study reports that its integrity is threatened during normal ageing. Finally, our third study investigates whether CC can emerge from very brief exposures of regularities (i.e., 50ms), and suggests that regularities can actually be extracted and exploited even though search displays are not (physically) available long enough to complete the search
Reuter, Robert. "Direct and indirect measures of learning in visual search." Doctoral thesis, Universite Libre de Bruxelles, 2013. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209542.
Full textand (4) to investigate whether such knowledge about the association between visual contexts and “meaningful” locations can be (automatically) transferred to other tasks, namely a change detection task.
In a first series of four experiments, we tried to replicate the documented contextual cueing effect using a wide range of various direct measures of learning (tasks that are supposed to be related to explicit knowledge) and we systematically varied the distinctiveness of context configurations to study its effect on both direct and indirect measures of learning.
We also ran a series of neural network simulations (briefly described in the general discussion of this thesis), based on a very simple association-learning mechanism, that not only account for the observed contextual cueing effect, but also yield rather specific predictions about future experimental data: contextual cueing effects should also be observed when repetitions of context configurations are not perfect, i.e. the networks were able to react to slightly distorted versions of repeating contexts in a similar way than they did to completely identical contexts. Human participants, we conjectured, should therefore (if the simple connectionist model captures some relevant aspects of the contextual cueing effect) become faster at detecting targets surrounded by context configurations that are only partially identical from trial to trial compared to those trials where the context configurations were randomly generated. These predictions were tested in a second series of experiments using pseudo-repeated context configurations, where some distractor items were either displaced from trial to trial or their orientation changed, while conserving their global layout.
In a third series of experiments, we used more realistic images of natural landscapes as background contexts to establish the robustness of the contextual cueing effect as well as its ecological relevance claimed by Chun and colleagues. We furthermore added a second task to these experiments to study whether the acquired knowledge about the background-target location associations would (automatically) transfer to another visual search task, namely a change detection task. If participants have learned that certain locations of the repeated images are “important”, since they contain the target item to look for, then changes occurring at those specific locations should lead to less “change blindness” than changes occurring at other irrelevant locations. We used two different types of instructions to introduce this second task after the visual search task, where we either stressed the link between the two tasks, i.e. telling them that remembering the “important” locations for each image could be used to find the changes faster, or we simply told them to perform the second task without any reference to the first one.
We will close this thesis with a general discussion, combining findings based on our review of the existing research literature and findings based on our own experimental explorations of the contextual cueing effect. By this we will discuss the implications of our empirical studies for the scientific investigation of contextual cueing and implicit learning, in terms of theoretical, empirical and methodological issues.
Doctorat en sciences psychologiques
info:eu-repo/semantics/nonPublished
Zang, Xuelian [Verfasser], and Hermann J. [Akademischer Betreuer] Müller. "Differential contributions of global, local and background contexts in contextual-guided visual search / Xuelian Zang. Betreuer: Hermann J. Müller." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2014. http://d-nb.info/1076471927/34.
Full textZimák, Radek. "Podnikatelský záměr v oblasti českého internetu včetně realizace." Master's thesis, Vysoká škola ekonomická v Praze, 2010. http://www.nusl.cz/ntk/nusl-75989.
Full textKalous, Martin. "Srovnání reklamních systémů a vybrání nejvhodnější varianty pro "Pension 48"." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-124559.
Full textKuo, Yin-Hsi, and 郭盈希. "Exploiting Contextual Information for Visual Search." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ad6sbb.
Full text國立臺灣大學
資訊網路與多媒體研究所
105
With the prevalence of capture devices, people are used to share their images and videos on the social media (e.g., Flickr and Facebook). To provide relevant information (e.g., reviews, landmark names, products) for these uploaded media, the need for effective and efficient visual search (e.g., image retrieval, mobile visual search, product search) is emerging. It enables plenty of applications such as recommendation, annotation, and advertisement. The state-of-the-art approaches (visual features) usually suffer from low recall rates because small changes in lighting conditions, viewpoints, or occlusions could degrade the performance significantly. We observe that enormous media collections are along with rich contextual cues such as tags, geo-locations, descriptions, and time. Hence, we propose to exploit different contextual information with the state-of-the-art visual features for solving the above challenges, and are able to improve the retrieval accuracy and provide diverse search results.
"Categorical Contextual Cueing in Visual Search." Master's thesis, 2014. http://hdl.handle.net/2286/R.I.25798.
Full textDissertation/Thesis
Masters Thesis Psychology 2014
Lukie, Michael Paul. "In search of student engagement in high school physics through contextual teaching." 2012. http://hdl.handle.net/1993/8116.
Full textGhafouri, Farveh. "In Search of Understanding Children's Engagement with Nature and their Learning Experiences in One Urban Kindergarten Classroom." Thesis, 2012. http://hdl.handle.net/1807/32718.
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