• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 13
  • 5
  • 5
  • 3
  • 2
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 35
  • 14
  • 11
  • 11
  • 10
  • 8
  • 8
  • 8
  • 8
  • 7
  • 6
  • 6
  • 6
  • 5
  • 5
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Personalisierte Filterung von Nachrichten aus semistrukturierten Quellen: Personalisierte Filterung von Nachrichten aus semistrukturierten Quellen

Eixner, Thomas 04 May 2009 (has links)
Durch die Vielzahl von heterogenen Informationsquellen sehen sich viele Nutzer einer kaum überschaubaren Informationsflut gegenüber. Aus diesem Grund werden durch diese Arbeit die gängigen Nachrichtenformate analysiert und der aktuelle Stand der Technik im Bereich der Nachrichtenaggregatoren dargelegt. Dabei werden diese Analysen immer mit Blick auf die Möglichkeiten einer personalisierten Filterung der Inhalte durchgeführt. Anschließend wird eine im Rahmen dieser Arbeit entstandene Infrastruktur für die Aggregation, personalisierte Filterung und kollaborative Empfehlung von Inhalten aus heterogenen Nachrichtenquellen vorgestellt. Dabei wird detailiert auf die zu Grunde liegenden Konzepte eingegangen und deren praktische Umsetzung beschrieben.
22

Can Sentiments of Social Media Participants Reflect by Financial Market Liquidity

Saleemi, Jawad 26 July 2024 (has links)
Tesis por compendio / [ES] Esta tesis doctoral se enmarca en el área de investigación del Departamento de Economía y Ciencias Sociales, y se centra en la perspectiva conductual de la liquidez del mercado. La liquidez que varía en el tiempo y sus problemas relacionados son una de las preocupaciones dominantes en la literatura de microestructura del mercado. El papel crítico de la liquidez del mercado en la ejecución de transacciones o la determinación del rendimiento de la inversión genera inquietudes tanto para académicos como para aquellos que participan en el mercado. Por lo tanto, es necesario desvelar los problemas potenciales que pueden afectar la liquidez del mercado financiero. Esta tesis busca entender la liquidez del mercado y sus problemas relacionados a la luz del comportamiento de los inversores. La perspectiva conductual de la liquidez se examina utilizando información orientada a opiniones en microblogs. La creciente literatura de finanzas conductuales también incluye la autenticidad de los datos de microblogs tanto en la modelización como en la predicción de diversas preocupaciones asociadas con el funcionamiento eficiente de los mercados financieros. Sin embargo, la investigación previa en el ámbito de las finanzas conductuales podría haber pasado por alto algunas implicaciones potenciales de la información orientada a opiniones en microblogs sobre la liquidez del mercado a nivel de mercado y de empresa. Por lo tanto, la tesis pretende ser una aplicación empírica en esta área de investigación. La tesis se lleva a cabo como un compendio de artículos científicos, cuya memoria incluye varios artículos de investigación publicados en revistas indexadas. El primer artículo proporciona información sobre la relación entre el contenido de microblogs y el coste de facilitación de la liquidez. Durante los períodos de negociación, este estudio sugirió que el estado de ánimo de los inversionistas tenía menos influencia en afectar la liquidez que varía en el tiempo y su coste de facilitación. Sin embargo, la información entrante en un día dado fue más influyente para las sesiones de negociación siguientes. Los sentimientos construidos sobre una base de dos días estaban asociados con el costo de facilitación de la liquidez. El segundo articulo aborda las dimensiones de la liquidez del mercado utilizando opiniones de microblogs. Esta investigación reveló que los sentimientos de los inversores en entornos de pesimismo tenían más poder autoritario sobre las dimensiones de la liquidez, incluidos los costes de negociación, la inmediatez de la transacción, la dispersión de precios y el volumen de negociación. Finalmente, el tercer articulo de investigación explora el riesgo sistemático de sentimiento para la liquidez en relación con los datos de microblogs. Este estudio mostró que la liquidez del índice bancario estaba expuesta al riesgo sistemático de sentimiento y liquidez, pero la liquidez del índice de empresas no financieras solo estaba expuesta a un riesgo sistemático de liquidez. Los participantes del mercado impulsados por los sentimientos observados en la plataforma de microblogging pueden no solo influir en la liquidez del mercado, que varía en el tiempo y sus dimensiones, sino que también pueden exponerse al riesgo sistemático para la liquidez dentro de un mercado más amplio. Por lo tanto, se sugiere que la liquidez y sus aspectos relacionados se valoren frente a los problemas de selección adversa en el mercado. Además, la medición de la información entrante en la plataforma de microblogging puede ayudar mejor a los proveedores de liquidez en la construcción de carteras. / [CA] Aquesta tesi doctoral s'emmarca en l'àrea d'investigació del Departament d'Economia i Ciències Socials, i es centra en la perspectiva conductual de la liquiditat del mercat. La liquiditat que varia en el temps i els seus problemes relacionats són una de les preocupacions dominants en la literatura de microestructura del mercat. El paper crític de la liquiditat del mercat en l'execució de transaccions o la determinació del rendiment de la inversió genera inquietuds tant per a acadèmics com per a aquells que participen en el mercat. Per tant, és necessari desvetlar els problemes potencials que poden afectar la liquiditat del mercat financer. Aquesta tesi busca entendre la liquiditat del mercat i els seus problemes relacionats a la llum del comportament dels inversors. La perspectiva conductual de la liquiditat s'examina utilitzant informació orientada a opinions en microblogs. La creixent literatura de finances conductuals també inclou l'autenticitat de les dades de microblogs tant en la modelització com en la predicció de diverses preocupacions associades amb el funcionament eficient dels mercats financers. No obstant això, la recerca prèvia en l'àmbit de les finances conductuals podria haver passat per alt algunes implicacions potencials de la informació orientada a opinions en microblogs sobre la liquiditat del mercat a nivell de mercat i d'empresa. Per tant, la tesi pretén ser una aplicació empírica en aquesta àrea d'investigació. La tesi es duu a terme com a compendi d'articles cientifics, la memòria de la qual inclou diversos articles de recerca publicats en revistes indexades. El primer article proporciona informació sobre la relació entre el contingut de microblogs i el cost de facilitació de la liquiditat. Durant els períodes de negociació, aquest estudi va suggerir que l'estat d'ànim dels inversors tenia menys influència en afectar la liquiditat que varia en el temps i el seu cost de facilitació. No obstant això, la informació entrant en un dia donat era més influent per a les sessions de negociació següents. Els sentiments construïts sobre una base de dos dies estaven associats amb el cost de facilitació de la liquiditat. El segon article aborda les dimensions de la liquiditat del mercat utilitzant opinions de microblogs. Aquesta recerca va revelar que els sentiments dels inversors en entorns de pessimisme tenien més poder autoritari sobre les dimensions de la liquiditat, inclosos els costos de negociació, la immediatesa de la transacció, la dispersió de preus i el volum de negociació. Finalment, el tercer article de recerca explora el risc sistemàtic de sentiment per a la liquiditat en relació amb les dades de microblogs. Aquest estudi va mostrar que la liquiditat de l'índex bancari estava exposada al risc sistemàtic de sentiment i liquiditat, però la liquiditat de l'índex d'empreses no financeres només estava exposada a un risc sistemàtic de liquiditat. Els participants del mercat impulsats pels sentiments observats a la plataforma de microblogging poden no només influir en la liquiditat del mercat, que varia en el temps i les seves dimensions, sinó que també poden exposar-se al risc sistemàtic per a la liquiditat dins d'un mercat més ampli. Per tant, es suggereix que la liquiditat i els seus aspectes relacionats es valoren davant dels problemes de selecció adversa en el mercat. A més, la mesura de la informació entrant a la plataforma de microblogging pot ajudar millor els proveïdors de liquiditat en la construcció de carteres. / [EN] This doctoral dissertation falls in the research area of economic and social sciences department, and focuses on the behavioral perspective of market liquidity. The time-varying liquidity and its related issues are one of the dominant concerns in the market microstructure literature. The critical role of market liquidity in executing the transactions or determining the yield on investment is raising concerns for both academics and those who engage in the trading. There is thus need to unveil the potential issues, that may impact the financial market liquidity. This dissertation seeks to understand market liquidity and its related issues in the light of investors' behavior. The behavioral perspective of liquidity is examined using microblogging-opinionated information. The escalation of behavioral finance literature also comprises the authenticity of microblogging data in both modeling and predicting various concerns associated with the efficient functioning of financial markets. However, previous research in the behavioral finance domain might have ignored a few potential implications of microblogging-opinionated information on market liquidity at the market and firm levels. Therefore, the dissertation aims to be the first empirical attempt in this area of research. The thesis is carried out as a compendium of scientific papers, whose memory includes several research articles published in the indexed journals. The first article provides insights into relationship between microblogging content and liquidity-facilitating cost. During trading periods, this study suggested that investors' mood was less influential in affecting the time-varying liquidity and its providing cost. However, the incoming information on a given day was more influential for following trading sessions. The sentiments built on a two-day basis were associated with the liquidity-facilitating cost. The second article covers the dimensions of market liquidity using microblogging opinions. This research revealed that investor sentiments in environments of pessimism had more authoritative power on liquidity dimensions including the trading costs, transaction immediacy, price dispersion and trading volume. Finally, the third research paper explores the systematic sentiment risk for liquidity in relation to the microblogging data. This study depicted that the bank index liquidity was exposed to the systematic sentiment and liquidity risks, but non-financial firm index liquidity was only exposed to a systematic liquidity risk. The emotion-driven market participants on microblogging platform may not only influence the time-varying market liquidity and its dimensions, but they may also expose to the systematic risk for liquidity withing a broader market. Thus, liquidity and its related aspects are suggested to be priced against the adverse selection issues in the market. Additionally, the measurement of incoming information on microblogging platform may better assist the liquidity providers in the construction of portfolio. / Saleemi, J. (2024). Can Sentiments of Social Media Participants Reflect by Financial Market Liquidity [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/206814 / Compendio
23

Dialogue, Twitter and new technology-based firms : The communication practice on a social medium

Kemna, Tabea January 2013 (has links)
Dialogical communication is considered to be the most ethical way of practicing public relations. Especially social medias’ potential for engaging in dialogue is mostly not exploited to its full potential. This study aims to shed light on new technology-based firms’ use of dialogical communication on Twitter. The focus hereby is on the formal side of dialogue and not on its content. Moreover possible explanations for the presence or absence of dialogue are taken into consideration. To be able to classify the results they are discussed in the context of the Fortune 500 companies’ use of Twitter. In order to do so a content analysis of both the Twitter profiles and tweets of 89 new technology-based firms was undertaken. The results showed that the Fortune 500 companies were communicating more dialogically than the new technology-based firms did. Bigger companies engaged in dialogue more often. The performance was furthermore improved by listening rather than posting. An implication is that a profound knowledge of communication is necessary in order to use the social medium successfully. A pure knowledge of technology was not found to be beneficial for this public relations practice.
24

Weibo's Role in Shaping Public Opinion and Political Participation in China / Weibo's Role in Shaping Public Opinion and Political Participation in China

Chen, Shajin January 2014 (has links)
This thesis examines the role of microblogging in shaping public opinion and political participation in China with particular focus on the question of what sociopolitical implications and challenges that weibo phenomenon has brought to the Chinese society. I explore some of the prominent features of weibo for the role they plays in framing public sphere. Along with an in-depth study of two weibo cases, the results show that microblogging provide a unique platform for Chinese citizens to participate in civic engagement and to organize their collective opinions. The study also demonstrates that weibo has a significant impact on spurring social change. Further, weibo discourse encourages interaction between government and ordinary citizens, and it also changes traditional Chinese politics through enabling public political participation. However, the spread of rumors and network violence are some of the disadvantages inherent to the weibo phenomenon that should be of concern. More importantly, the analysis reveals that the initial reasons behind the weibo phenomenon were the long-term social conflicts and continuous information control by the state. Weibo certainly provides a remarkable platform for the freedom of speech but it should not be considered as a panacea for the social changes in China.
25

Mikroblog pro týmy / Team-Based Microblogging Service

Kotásek, Marek January 2013 (has links)
The aim of this master's thesis is design and implementation of team-based microblogging service, which will be used on the Faculty of Information Technology, Brno University of Technology. First, concept of the microblogging together with the analysis of an existing microblogging services and implementation tools is described. Next part of this work goes into the details of the design, implementation and testing of the developed microblogging service.
26

Nutzung von Yammer als leichtgewichtiges many-to-many Kommunikationstool bei der Saxonia Systems AG

Helas, Holger 23 May 2014 (has links) (PDF)
Um die dezentrale Kommunikation zwischen Beratern und Softwareentwicklern zu verbessern, entschied sich die Saxonia Systems AG zum Test des Microblogging-Dienstes Yammer. Nach nur vier Wochen waren bereits 89 Anwender im System aktiv, die 1.391 Postings verfasst hatten. Die Evaluation durch eine Online-Nutzerbefragung zeigte die prinzipielle Tauglichkeit und Akzeptanz, aber auch die derzeitigen Grenzen von Microblogging auf.
27

SOME4PM: um framework prescritivo para guiar o uso integrado de mídias sociais em gerenciamento de projetos / SOME4PM: a prescriptive framework for guiding integrated use of social media in project management

Ikemoto, Miriam Naomi 23 February 2017 (has links)
Submitted by Nadir Basilio (nadirsb@uninove.br) on 2017-08-04T17:20:25Z No. of bitstreams: 1 Miriam Naomi Ikemoto.pdf: 2455275 bytes, checksum: d511c89b58b5b9d13ca36c635db32c00 (MD5) / Made available in DSpace on 2017-08-04T17:20:25Z (GMT). No. of bitstreams: 1 Miriam Naomi Ikemoto.pdf: 2455275 bytes, checksum: d511c89b58b5b9d13ca36c635db32c00 (MD5) Previous issue date: 2017-02-23 / O atual ambiente competitivo leva as empresas a procurarem soluções para melhorar o desempenho de seus projetos. Nesse contexto, a adoção de ferramentas para suportar a gestão desses projetos é essencial. Mídias sociais como wikis, blogues e microblogues, surgiram para apresentar novas formas de facilitar as atividades de gerenciamento de projetos (GP), para que possam contribuir para o sucesso do projeto. No entanto, as empresas subexploram o efetivo uso integrado de tais ferramentas como suporte no GP. Os gerentes de projeto enfrentam alguns desafios, tais como falta de conhecimento das ferramentas e, onde e como armazenar dados para a utilização eficaz destas tecnologias. O objetivo desta pesquisa é desenvolver um framework prescritivo para orientar o uso integrado de mídias sociais para apoiar o GP. Esta pesquisa exploratória e qualitativa foi conduzida sob a epistemologia construtivista social e hermenêutica. Primeiro, eu realizei uma revisão de literatura utilizando uma abordagem hermenêutica. Como o uso de mídias sociais no GP ainda é um tema emergente, existem poucos estudos empíricos sobre o assunto. Para superar esse problema, entrevistei gerentes de projetos e realizei um grupo focal exploratório com participantes que usavam mídias sociais em sua profissão. Analisei os dados usando Grounded Theory Methodology (GTM) da Escola Charmaz, versão construtivista e mais recente do Grounded Theory. Finalmente, realizei um grupo focal confirmatório para validar o framework. Os resultados mostram que o entendimento dos recursos de cada mídia social, juntamente com ações de conscientização do uso de um conjunto comum de ferramentas, representa um instrumento poderoso para a condução de projetos nas organizações. Foram identificadas quatro categorias de uso das mídias sociais: comunicação, controle, disseminação e repositório. Considerando que a maioria das pesquisas explora o uso de uma única ferramenta ou seu uso isolado, esta pesquisa adiciona à literatura o SOME4PM - um framework prescritivo de uso integrado de mídias sociais para GP. Como contribuição prática, apresenta uma visão do framework contendo exemplos de mídias sociais atuais para ajudar as organizações na escolha do conjunto dessas mídias que melhor se encaixa em suas necessidades. Além disso, fornece cenários e recomendações para o uso efetivo do SOME4PM nas organizações. Assim, os gerentes de projeto têm uma visão ampla sobre como as mídias sociais estão sendo usadas e como elas podem ser integradas para apoiar o GP. / The current competitive environment drives companies to seek solutions to improve the performance of their projects. In this context, the adoption of tools to support the management of these projects is essential. Social media such as wikis, blogs and microblogs, have emerged to present innovative ways to facilitate project management (PM) activities so that they can contribute to the success of the projects. However, companies underexplore the effective integrated use of such tools as a support in PM. Project managers face some challenges, such as lack of knowledge of the tools and, where and how to store data for the effective use of these technologies. The objective of this research is to develop a prescriptive framework to guide the integrated use of social media to support PM. This exploratory and qualitative research was conducted under the social constructivist epistemology and hermeneutics. First, I performed a literature review using a hermeneutic approach. As the use of social media in PM is still an emerging theme, there are few empirical studies on the subject. To overcome this problem, I interviewed project managers and I led an exploratory focus group with participants who use social media in their profession. I analyzed the data using Grounded Theory Methodology (GTM) of the Charmaz, a constructivist and the later version of Grounded Theory. Finally, I led a confirmatory focus group to validate the framework. Findings show the understanding of the resources of each social media, along with actions to raise awareness of the use of a common set of tools, represent a powerful instrument for conducting projects in organizations. Four categories of the use of social media were identified: communication, control, dissemination and repository. Considering that most research explores the use of a single tool or their use isolated, this research adds to the literature SOME4PM - a prescriptive framework of integrated use of social media in PM. As a practical contribution, it presents a view of framework contains examples of currently social media to help organizations choice the set of social media that better fit in their needs. Furthermore, it provides scenarios and recommendations for the effective use of SOME4PM in organizations. Hence, project managers have a broad vision on how social media are being used and how they can be integrated to support PM.
28

Nutzung von Yammer als leichtgewichtiges many-to-many Kommunikationstool bei der Saxonia Systems AG

Helas, Holger January 2010 (has links)
Um die dezentrale Kommunikation zwischen Beratern und Softwareentwicklern zu verbessern, entschied sich die Saxonia Systems AG zum Test des Microblogging-Dienstes Yammer. Nach nur vier Wochen waren bereits 89 Anwender im System aktiv, die 1.391 Postings verfasst hatten. Die Evaluation durch eine Online-Nutzerbefragung zeigte die prinzipielle Tauglichkeit und Akzeptanz, aber auch die derzeitigen Grenzen von Microblogging auf.
29

Stream Clustering And Visualization Of Geotagged Text Data For Crisis Management

Crossman, Nathaniel C. 08 June 2020 (has links)
No description available.
30

Social Software in Unternehmen. Ein Erfahrungsbericht

Meißner, Stefan 15 May 2014 (has links) (PDF)
No description available.

Page generated in 0.0534 seconds