Thesis (Ph. D.)--Johns Hopkins University, 1930. / Vita. Published also as Comparative psychology monographs, v. 7, serial no. 34, February, 1931. Bibliography: p. 81-82.

Thesis (Ph. D.)--Johns Hopkins University, 1930. / Vita. Published also as Comparative psychology monographs, v. 7, serial no. 34, February, 1931. "References": p. 81-82.

Företag och organisationer som tillhandahåller kundsupport via e-post kommer över tid att samla på sig stora mängder textuella data. Tack vare kontinuerliga framsteg inom Machine Learning ökar ständigt möjligheterna att dra nytta av tidigare insamlat data för att effektivisera organisationens framtida supporthantering. Syftet med denna studie är att analysera och utvärdera hur Deep Learning kan användas för att automatisera processen att klassificera supportärenden. Studien baseras på ett svenskt företags domän där klassificeringarna sker inom företagets fördefinierade kategorier. För att bygga upp ett dataset extraherades supportärenden inkomna via e-post (par av rubrik och meddelande) från företagets supportdatabas, där samtliga ärenden tillhörde en av nio distinkta kategorier. Utvärderingen gjordes genom att analysera skillnaderna i systemets uppmätta precision då olika metoder för datastädning användes, samt då de neurala nätverken byggdes upp med olika arkitekturer. En avgränsning gjordes att endast undersöka olika typer av Convolutional Neural Networks (CNN) samt Recurrent Neural Networks (RNN) i form av både enkel- och dubbelriktade Long Short Time Memory (LSTM) celler. Resultaten från denna studie visar ingen ökning i precision för någon av de undersökta datastädningsmetoderna. Dock visar resultaten att en begränsning av den använda ordlistan heller inte genererar någon negativ effekt. En begränsning av ordlistan kan fortfarande vara användbar för att minimera andra effekter så som exempelvis träningstiden, och eventuellt även minska risken för överanpassning. Av de undersökta nätverksarkitekturerna presterade CNN bättre än RNN på det använda datasetet. Den mest gynnsamma nätverksarkitekturen var ett nätverk med en konvolution per pipeline som för två olika test-set genererade precisioner på 79,3 respektive 75,4 procent. Resultaten visar också att några kategorier är svårare för nätverket att klassificera än andra, eftersom dessa inte är tillräckligt distinkta från resterande kategorier i datasetet. / Companies and organizations providing customer support via email will over time grow a big corpus of text documents. With advances made in Machine Learning the possibilities to use this data to improve the customer support efficiency is steadily increasing. The aim of this study is to analyze and evaluate the use of Deep Learning methods for automizing the process of classifying support errands. This study is based on a Swedish company’s domain where the classification was made within the company’s predefined categories. A dataset was built by obtaining email support errands (subject and body pairs) from the company’s support database. The dataset consisted of data belonging to one of nine separate categories. The evaluation was done by analyzing the alteration in classification accuracy when using different methods for data cleaning and by using different network architectures. A delimitation was set to only examine the effects by using different combinations of Convolutional Neural Networks (CNN) and Recurrent Neural Networks (RNN) in the shape of both unidirectional and bidirectional Long Short Time Memory (LSTM) cells. The results of this study show no increase in classification accuracy by any of the examined data cleaning methods. However, a feature reduction of the used vocabulary is proven to neither have any negative impact on the accuracy. A feature reduction might still be beneficial to minimize other side effects such as the time required to train a network, and possibly to help prevent overfitting. Among the examined network architectures CNN were proven to outperform RNN on the used dataset. The most accurate network architecture was a single convolutional network which on two different test sets reached classification rates of 79,3 and 75,4 percent respectively. The results also show some categories to be harder to classify than others, due to them not being distinct enough towards the rest of the categories in the dataset.

Submitted by Adriana Alves Rodrigues (aalves@espm.br) on 2018-10-05T18:57:46Z No. of bitstreams: 1 ppgcom - pedro ernesto gandine tancini.pdf: 3635679 bytes, checksum: 89c79dbbf3313f955bec1c276dfa3c08 (MD5) / Approved for entry into archive by Adriana Alves Rodrigues (aalves@espm.br) on 2018-10-05T18:58:07Z (GMT) No. of bitstreams: 1 ppgcom - pedro ernesto gandine tancini.pdf: 3635679 bytes, checksum: 89c79dbbf3313f955bec1c276dfa3c08 (MD5) / Approved for entry into archive by Debora Cristina Bonfim Aquarone (deborabonfim@espm.br) on 2018-10-08T11:53:34Z (GMT) No. of bitstreams: 1 ppgcom - pedro ernesto gandine tancini.pdf: 3635679 bytes, checksum: 89c79dbbf3313f955bec1c276dfa3c08 (MD5) / Made available in DSpace on 2018-10-08T11:54:45Z (GMT). No. of bitstreams: 1 ppgcom - pedro ernesto gandine tancini.pdf: 3635679 bytes, checksum: 89c79dbbf3313f955bec1c276dfa3c08 (MD5) Previous issue date: 2018-03-27 / This master thesis turns on time representations and memory movements in the contemporary context of consumption. We pick the setting Tormenta RPG as the object of research. Role-playing game, RPG, is a game format in which players experience narratives in an improvised and collaborative way. Tormenta RPG, in turn, is an editorial brand that, through descriptive books, builds a fictional environment for this game, promoting a universe inspired in medieval fantasy but with reference to different non-medieval contexts. We investigate how the text of Tormenta RPG, by operating time representations allied to the appropriation of medieval fantasy and others historical imaginaries, resignifies the temporalities relating to the culture of consumption and culture of memory contexts. The methodology involves, first, bibliographical research around the concept of time, memory and consumption, with reference to authors such as N. Elias, G. Szamosi, R. Koselleck, concerning the time in its structural quality and in the modernity arrival, Z. Bauman, A. Huyssen, D. Harvey, F. Hartog, concerning the contemporary temporalities, culture of memory and culture of consumption. As of this theoretical core, we develop analysis of the “timeline” text introduced by the book “Tormenta RPG”, based on categories created from the cultural semiotics studies of I. Lotman. We expect to explore the qualities that the time representations and the memory movements, articulated to the consumption logics, imprint in the composition of our actual temporalities, in how we bring our pasts do the present and how we imagine our futures. / Esta dissertação de mestrado versa sobre as representações de tempo e os movimentos de memória no contexto contemporâneo de consumo. Elegemos como objeto de pesquisa o cenário de Tormenta RPG. Role-playing game, o RPG, é uma modalidade de jogo de interpretação de papéis em que os participantes vivenciam narrativas de forma improvisada e colaborativa. Tormenta RPG, por sua vez, é uma marca editorial que, por meio de livros descritivos, constrói um ambiente ficcional para essas partidas, promovendo um universo inspirado na Idade Média mas com referência a diversos contextos não medievais. Investigamos como o texto de Tormenta RPG, ao operar representações de tempo aliadas à apropriação de imaginários de fantasia medieval e outros períodos históricos, ressignifica as temporalidades próprias ao contexto contemporâneo de cultura do consumo e cultura da memória. A metodologia envolve, primeiramente, pesquisa bibliográfica em torno do tempo, memória e consumo, com referência a autores como N. Elias, G. Szamosi, R. Koselleck, no que toca o tempo em seu caráter estrutural e no advento da modernidade, e Z. Bauman, A. Huyssen, D. Harvey, F. Hartog, no que toca as temporalidades contemporâneas, cultura da memória e cultura do consumo. A partir desse núcleo teórico, desenvolvemos análise do texto da “linha do tempo” apresentado pelo livro “Tormenta RPG”, tendo como base categorias criadas a partir dos estudos de semiótica da cultura de I. Lotman. Esperamos explorar as qualidades que as representações de tempo e os movimentos de memória na cultura, articulados às lógicas de consumo, imprimem na composição das nossas temporalidades atuais, em como atualizamos nossos passados e imaginamos nossos futuros.

Classical experiments on honey bee time-memory showed that foragers trained to collect food at a fixed time of day return the following day with remarkable time-accuracy. Previous field experiments revealed that not all foragers return to a food source on unrewarded test days. Rather, there exist 2 subgroups: “persistent” foragers reconnoiter the source; “reticent” foragers wait in the hive for confirmation of source availability. To examine how these foragers contribute to a colony’s ability to reallocate foragers across sources with rapidly changing availabilities, foragers were trained to collect sucrose during a restricted window for several days and observed over 3 days throughout which the feeder was empty. In 2 separate trials, activity monitoring revealed a high level of activity apparently directed at other food sources. This “extracurricular” activity showed extensive temporal overlap with visits to the feeder, indicating that honey bees can manage at least 2 different overlapping time memories.

The main objective of this master&rsquo / s thesis is to examine the concept of difference according to French philosophers Gilles Deleuze and Henri Bergson. In order to explicate this crucial concept and its emphasis in these thinkers&rsquo / philosophies, this dissertation is focused on the notion of time and memory. Through the thesis, first Deleuze&rsquo / s critical attitude towards representational and dialectical approachs for difference is elucidated. After the comprehensive examination for the meaning of difference according to Deleuze, the understanding of time is revealed by means of Deleuzian comprehension of repetition and Bergsonian notion of duration. Throughout the thesis what is virtually hidden beneath the arguments, what is common in both philosophers finally is exposed as the concept of becoming. For Deleuze, whose philosophy of time is certainly dependent on Bergson, time creates a renewed conception in order for subject to be an individual as the state of permanent becoming. And an individual which is qualified as a state of becoming, is the memory of time where the latter is an infinite virtuality.

Time Memory Trade O (TMTO) is a cryptanalytic method that aims to develop an attack which has a lower memory complexity than lookup table and a lower online time complexity than exhaustive search. TMTO methods are widely studied in the literature and used for inverting various cryptosystems. We focus on the design and the analysis of TMTO on symmetric ciphers in this thesis. Firstly, the summary of the random mapping statistics from the view point of TMTO is presented. We also recalculate some expected values with a simpler approach than the existing proofs. Then, we propose some variant constructions and also present three new distinguishers based on random mappings. Next, we provide a detailed analysis of the success rate of two main improvements of the attack / Distinguished Point Method and Rainbow Method. Finally, we discuss the adjustment of the parameters to achieve a high success rate. To support our theoretical framework, we also present empirical results of our analysis to actual ciphers.

This thesis explores how women's writing in mid-twentieth century Uruguay enables a reconsideration of the intertwined hegemonic practices of literary canon formation and national identity in this seminal period. Within a national history and a cultural tradition conceived of as patriarchal, progressive and homogeneous, in correspondence to a European/Eurocentric concept of time and historicism, women writers struggled to find a recognised position from which to speak. Nevertheless, like other marginal groups, women writers have challenged the hegemonic discourses of modernity in Uruguay, as elsewhere in Latin America, producing what can be described, following Elaine Showalter, as a double-voiced textual strategy that replicates as well as subverts the dominant order. In this respect, Concepción Silva Bélinzon (Montevideo, 1900-1987) offers a remarkable case study to show how women's poetry destabilises and renegotiates the great discourses of modernity. Socially and culturally marginalised, Silva Bélinzon's life demonstrates the failures and limitations of a patriarchal/paternalistic society, while her poetry problematises the homogeneous national discourses of modern Uruguay, exposing the discontinuity inherent to a national history conceived of as masculine, linear and teleological. Silva Bélinzon's poetry has been defined as a synthesis of Modernismo and Surrealism, and described as a combination of free associations, biblical references and metaphysical concerns, all expressed within conventional metric forms, notably, the sonnet. Her poetry has been considered incoherent and bizarre, and has thus received little critical attention. However, one of the most interesting characteristics of her poetry has been overlooked. That is, the juxtaposition of different artistic trends and the dialectical tension that exists between the use of random, discontinuous and disconnected images within strict traditional poetic forms. The theoretical approach of this thesis is predominantly framed by postcolonial, feminist and gender theories, including those of Homi K. Bhabha and Judith Butler. In addition, drawing on Henri Bergson's work, Matière et mémoire (1896) and Marcel Proust's well-known idea of mémoire involontaire, I interpret Silva Bélinzon's elliptical poetry as a virtual journey through layers of the personal and national pasts that thereby deterritorialises the national, hegemonic discourses of the modern nation. Thus, using Silva Bélinzon's poetry as a case study, the thesis aims to demonstrate how women writers ‘overlap in the act of writing the nation' (Bhabha 2003: 292).

Honey bee foragers form time memories that enable them to match their foraging activity to the time of day when a particular food source is most productive. Persistent foragers show food-anticipatory activity by making reconnaissance flights to the previously productive food source and may continue to inspect it for several days. In contrast, reticent foragers do not investigate the source but wait for confirmation from returning persistent foragers. To determine how persistent and reticent foragers might contribute to the colony's ability to rapidly reallocate foragers among sources, we trained foragers to collect sucrose from a feeder at a restricted time of day for several days and then observed their behavior for three consecutive days during which the feeder was empty. In two separate trials, video monitoring of the hive entrance during unrewarded test days in parallel with observing reconnaissance visits to the feeder revealed a high level of activity, in both persistent and reticent foragers, thought to be directed at other food sources. This 'extracurricular' activity showed a high degree of temporal overlap with reconnaissance visits to the feeder. In some cases, inspection flights to the unrewarded feeder were made within the same trip to an extracurricular source, indicating that honey bees have the ability to manage at least two different time memories despite coincidence with respect to time of day. The results have major implications for understanding flower fidelity throughout the day, flower constancy within individual foraging excursions, and the sophisticated cognitive management of spatiotemporal memories in honey bees.

Honey bee foragers form time memories that enable them to match their foraging activity to the time of day when a particular food source is most productive. Persistent foragers show food-anticipatory activity by making reconnaissance flights to the previously productive food source and may continue to inspect it for several days. In contrast, reticent foragers do not investigate the source but wait for confirmation from returning persistent foragers. To determine how persistent and reticent foragers might contribute to the colony's ability to rapidly reallocate foragers among sources, we trained foragers to collect sucrose from a feeder at a restricted time of day for several days and then observed their behavior for three consecutive days during which the feeder was empty. In two separate trials, video monitoring of the hive entrance during unrewarded test days in parallel with observing reconnaissance visits to the feeder revealed a high level of activity, in both persistent and reticent foragers, thought to be directed at other food sources. This 'extracurricular' activity showed a high degree of temporal overlap with reconnaissance visits to the feeder. In some cases, inspection flights to the unrewarded feeder were made within the same trip to an extracurricular source, indicating that honey bees have the ability to manage at least two different time memories despite coincidence with respect to time of day. The results have major implications for understanding flower fidelity throughout the day, flower constancy within individual foraging excursions, and the sophisticated cognitive management of spatiotemporal memories in honey bees.