Tesi: "Event study"

1

Hansson, Fredrik. "How does dividend events affect stock prices? : An event study on market efficiency". Thesis, Uppsala universitet, Nationalekonomiska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-435231.

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This paper examines the effects of dividend announcements and dividend payments on OMX30 stock prices and tests if these effects indicate market efficiency. An event study methodology is used to find if the dividend events have a significant impact on stock prices. The study finds that both dividend announcements and dividend payments have a significant negative effect on prices. Disappointed investors or lowered expectations for future dividends may be the cause of the announcement effect. The results indicate that the stock market is semi-strong efficient for the announcements but inefficient when it comes to the payments.

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Björnström, Marina, e Maja Lundmark. "Effective Events : A quantitative study analyzing if event marketing can help business students find a potential employer". Thesis, Umeå universitet, Företagsekonomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-126703.

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The main object of this thesis is to study and explore if students at Umeå School of Business and Economics (USBE) can find potential employers though Event Marketing (EM). The authors will analyze EM as a tool for interaction and information, and if these tools will help students gain more knowledge about companies that can make them more interesting as potential employers. Previous research was found regarding both EM and Employer Branding (EB), however there was little research found on how they can be used together. There was also little research to be found from business students point of view since in both EM and EB the previous research had rather been done from a company standpoint. Therefore, with the aim to fill these research gaps the following research question was formulated: Does event marketing help business and economics students find potential employers? The study uses a deductive research design with a quantitative research strategy, and the data was collected using a self-completing questionnaire. The authors adopted objectivism and positivism as their research philosophical standpoints. The sample was drawn though multi-stage cluster sampling, the samples selected contained 384 students enrolled at USBE and 132 replies was received and analyzed. The questions in the online self-completing questionnaire were designed to measure variables such as information and interaction. Findings indicate that EM does help Umeå business and economics students find new potential employers. However, students do not feel that they learn that much about new companies, they do not feel that they are interacting with companies and they do not feel that they are gaining more knowledge about a company at an event. The findings contribute to the research field of business administration. Specifically, the merging of EB and EM and how it is perceived from a student´s point of view rather than from a company’s perspective. The students do believe that events are an effective way to meet companies, however the empirical results from event attendees show differently. The theories within the subject and the answers from students regarding if they believe in EM or not are counterintuitive. Therefore, this study opens up possibilities for future research.

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3

Salotti, Valentina <1980&gt. "Multi-Country Event Study Methods". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1252/1/Valentina_Salotti_tesi.pdf.

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Which event study methods are best in non-U.S. multi-country samples? Nonparametric tests, especially the rank and generalized sign, are better specified and more powerful than common parametric tests, especially in multi-day windows. The generalized sign test is the best statistic but must be applied to buy-and-hold abnormal returns for correct specification. Market-adjusted and market-model methods with local market indexes, without conversion to a common currency, work well. The results are robust to limiting the samples to situations expected to be problematic for test specification or power. Applying the tests that perform best in simulation to merger announcements produces reasonable results.

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Salotti, Valentina <1980&gt. "Multi-Country Event Study Methods". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1252/.

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Abstract (sommario):

Which event study methods are best in non-U.S. multi-country samples? Nonparametric tests, especially the rank and generalized sign, are better specified and more powerful than common parametric tests, especially in multi-day windows. The generalized sign test is the best statistic but must be applied to buy-and-hold abnormal returns for correct specification. Market-adjusted and market-model methods with local market indexes, without conversion to a common currency, work well. The results are robust to limiting the samples to situations expected to be problematic for test specification or power. Applying the tests that perform best in simulation to merger announcements produces reasonable results.

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5

Kapur, Arjun. "The Impact of Mega Sporting Event Host Country Selection on Construction and Industrial Sectors of Stock Markets: An Event Study". Scholarship @ Claremont, 2013. http://scholarship.claremont.edu/cmc_theses/734.

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Nations have always competed vigorously during the bidding process to host mega sporting events. The selection of the host nation is a much anticipated decision that results in the promotion of a country on a global platform. In this paper, I use a market adjusted return (index) model to conduct an event study in order to examine abnormal returns in the stock market surrounding the selection of a nation for the Summer Olympics and the FIFA World Cup. I also focus specifically on the construction and industrial sectors, as well as analyze the impact of selection on the nation emerging as the runner up in the bidding process. The research finds that the outcome of the selection process is partially anticipated by investors, resulting in a market reaction that does not accurately measure the financial impact of hosting the event. As developing nations have demonstrated an increased interest in the hosting of events over the years, this paper also addresses the resulting policy implications, as well as the opportunity cost and the economic effects of crowding out and substitution.

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Baker, Ryan R. "A Case Study Examining the Structure of the Event Process at California Polytechnic State University". DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2030.

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The purpose of this study was to examine the structure of the event process on Cal Poly’s campus. An intrinsic case study method was used, and data were collected and analyzed using triangulation from three sources of information: documents, interviews, and participation research. Overall, the structure of the event management process on campus was found to be stable, but could use improvement. Cal Poly should consider establishing a specific, designated organization that would help centralize the event management process at Cal Poly. This organization could be in charge of training and updating event managers, approving events, monitoring volume of events on campus at a specific time, holding event managers accountable to following policies, and maintaining a website that would act as a hub for all event-related materials.

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7

Grant, Jennifer L. "Market perception of defense mergers in the United States 1990-2006 a case of event studies /". Thesis, Monterey, California, Naval Postgraduate School, 2007. http://hdl.handle.net/10945/38041.

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The purpose of this paper is to examine and analyze whether or not there was a statistically significant reaction in financial markets to the announcements of U.S. defense contractor consolidations (mergers and acquisitions) from January 1990 to December 2006. This analysis is accomplished through the use of two series of event studies, employing first the arithmetic and then the logarithmic returns against the S&P 500 index, involving the top five defense contractors: Boeing, Lockheed Martin, General Dynamics, Raytheon and Northrop Grumman. Many studies have been conducted using the event study methodology, and the results have shown in some cases that stock prices do respond to new information. The assumpton has been maintained that the market responds rationally to such announcements. In contrast, the announcements of the acquisition of publicly traded firms by other publicly traded firms have not always had a consistently significant beneficial effect on the shareholder wealth of the acquiring firms (Schipper & Thompson, 1983). Results of this case study further support the latter assertion, and add to the body of research involving event studies.

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8

Gur, Gershgoren Gitit. "Essays on issues in event study methodology". Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3222045.

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9

Cvejn, Michal. "Do markets notice economic policymaker changes? An event study". Master's thesis, Vysoká škola ekonomická v Praze, 2012. http://www.nusl.cz/ntk/nusl-135903.

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This paper applies event study analysis on stock and bond market data in 14 European countries between 1990 and 2012 in order to assess market reaction to key economic policymaker changes. The analysis relies on methodological framework is based on article of Kuttner & Posen (2010) and on an original database of political events. The empirical results show that policymaker changes are not reflected in markets as single-day events, rather they are associated with several days of increased volatility following the event. Furthermore, elections are shown to be linked with market volatility on the event day as well as in postevent period.

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10

Gunnervall, Anders. "Motives of potential event visitors : A pre-event case study of the Storsjöyran music festival". Thesis, Mittuniversitetet, Institutionen för samhällsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-14090.

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The purpose of this thesis was to study potential event visitors and their motives to either attend or not attend an event. A pre-event case study of the music festival Storsjöyran was conducted and 701 potential visitors’ motives were studied through a web-based survey containing both questions with 5-point Likert-type scale and open ended questions. The main motive for visiting Storsjöyran music festival was to experience the core program (live music), but socializing and to experience the special atmosphere were also important factors. Motives for not visiting the festival were a question of costs exceeding benefits. High costs did not solely mean high ticket prices but also included the effort to travel and the risk of what an event can bring in terms of negative experiences, mainly in the confrontation with other festival visitors. The results also support previous findings that motives differ between visitors to the same event. Respondents’ age, origin and links to the place where the festival is held were found to be useful segmentation factors according to the festival Storsjöyran. The organizers were recommend to continue to design the festival for music experiences, but also to consider the social interactions between visitors and design the event for more satisfying experiences related to this area.

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11

Andersson, Henrik. "Event scenes in role-playing games : A study about focus during event scenes versus gameplay". Thesis, Uppsala universitet, Institutionen för speldesign, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-254575.

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This thesis investigates the level of focus a player is displaying while playing a role-playing game. The thesis tries to answer the questions if the level of focus is different while a player is watching an event scene versus during gameplay and if there is a difference in the level of focus displayed by new players versus experience ones. To answer this question a playtest was performed in the role-playing game Final Fantasy XIII and the player’s reaction was recorded and documented. The result suggests that the level of focus a player is displaying is lower during event scenes than during gameplay.

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12

Larsson, Louise, Sophie Längvik e Linnéa Kjörling. "How does Event Marketing work on Social Media? : A qualitative study exploring Event Marketing in a Social Media context". Thesis, Linnéuniversitetet, Institutionen för marknadsföring (MF), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-85831.

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Background: Event marketing is a way for businesses to entertain consumers and promote the brand or product through the use of events. Within event marketing, entertainment, excitement and enterprise are important concepts to include in order to create a successful event. Purpose: The purpose is to explore event marketing in a social media context. The research question is “How is event marketing on social media experienced?” Methodology: This research undertook a qualitative research approach of explorative nature. Un-structured in-depth interviews was conducted with seven participants, sampled with quota sampling. The participants were selected with the criteria of being between the ages 16-34 and using social media and having previously experienced event marketing on social media. After these seven interviews had been conducted, saturation was reached. Conclusion: The main findings of this research are that entertainment, authenticity, innovation and quality are important categories of event marketing in a social media context. Thus, all four categories have an impact on the experience of an individual seeing a marketing event on social media. The category entertainment was shown to be influenced by authenticity, innovation and quality, which in turn has an effect on the experience of the viewer of the event.

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13

Wolfson, Shael Nathan. "Market Reaction to the Class Action Fairness Act of 2005". ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1116.

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The Class Action Fairness Act of 2005 (CAFA) was signed into law on February 18, 2005. Prior to CAFA, plaintiffs found it easier for class action lawsuits to be tried in their preferred venueâ€”state courts. Changes introduced by CAFA practically removed the majority of class action jurisdiction from state to federal courts. Since law and regulation might serve as an external corporate governance mechanism, an interesting question is whether CAFA has strengthened or weakened corporate governance. If CAFA improves corporate governance, associated marginal benefits would outweigh marginal costs. The opposite would be true if CAFA weakens corporate governance. This issue was hotly debated in the US Congress. The proponents argued that CAFA would reduce costs for the affected firms, while opponents argued the opposite. The main purpose of this paper is to examine which side of the debate is reflected in market reactions to various events that either enhanced or reduced the chances of the passage of CAFA. We identify the firms that are most likely to be affected by CAFA and find that the overall market reaction for these firms is positive when the likelihood of CAFA passage increases, while the reaction has been negative when the chance of its passage diminishes. We also hypothesize that firms that are more likely to be exposed to product liability litigation would experience a significantly higher (positive or negative) abnormal return than firms that are more likely to be involved in contract liability law suits. The results support this hypothesis. We also examine potential factors that might explain cross-sectional variations in abnormal returns and find that duality of Chairmanship and CEO has negative impact, while the

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14

DeFanti, Mark P. "The effect of a corporate name change related to a change in corporate image upon a firm's stock price". Thesis, [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1830.

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15

Bäckman, David, e Sofie Blomkvist. "Gränsöverskridande företagsförvärv : En event study av systematisk risk". Thesis, Uppsala University, Department of Business Studies, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8820.

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Internationaliseringen har ökat under de senaste åren, och företag väljer att lägga delar av verksamheten utomlands. Tidigare forskning undersöker sambandet mellan denna diversifiering och dess konsekvenser för företagen. Gränsöverskridande diversifiering och företagsförvärv bör enligt tidigare forskning ge en lägre systematisk risk då risken sprids ut över flera marknader.

Syftet med studien är att se om tidigare forsknings resultat går att tillämpa idag när svenska företag gör gränsöverskridande företagsförvärv. Vi har valt att applicera en event study-metodik för att undersöka detta samband enligt marknadsmodellen. Studien undersöker 66 svenska fall av gränsöverskridande företagsförvärv, gjorda under perioden 2005 – 2007.

Resultatet visar att tidigare empiri, att företagen skulle ha lägre systematisk risk efter ett gränsöverskridande företagsförvärv, inte går att tillämpa idag på de svenska företagen. Studien finner en ökad systematisk risk efter företagsförvärven, vilket tyder på att ingång på nya marknader i dagens globaliserade samhälle inte ger den lägre systematiska risk som tidigare kunnat påvisas. Även om ett statistiskt signifikant samband funnits för en ökning av systematisk risk uppvisar hälften av de undersökta företagen en lägre systematisk risk efter förvärvet, vilket tyder på att det är andra faktorer förknippade med företagsförvärvet som avgör den slutgiltiga effekten.

III

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16

Ahmadi, Parisa. "Analysis of traffic patterns for large scale outdoor events : A case study of Vasaloppet ski event". Thesis, KTH, Trafik och logistik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96506.

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Vasaloppet is a cross country ski event which has been held in Sweden for about 50 years. Now more than 50,000 people of different ages participate in various cross country ski races during the Vasaloppet winter week in Dalarna County. This increasing demand needs good traffic and transportation planning to avoid congestion and provide safe, on time and environmentally friendly transportation for participants and visitors to the area. The key for a good event traffic planning is reliable and up-to-date traffic data which is not available for the Vasaloppet winter week. This study is an attempt to collect traffic data in order to find the movement patterns in the area and estimate origin-destination matrices for the main event of Vasaloppet week. Based on resources and time limitation it was decided to use a web-base d participants’ survey in order to collect traffic data. The link to the survey was sent to email address of a sample of 5000 participants. About 64% of the participants drove from their home town to the area and about 31 percent travelled by bus. Train and airplane have a very small share in travel mode to the area. Malungsälen, Mora and Älvdalen are three municipalities in Dalarna County with the highest share in accommodating participants. On the day of the race, bus and car have approximately the same share in travel mode with 45% and 47% respectively.

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Johansson, Albin, e Nermin Duracak. "Stock Price Reactions to Negative Profit Warnings : An Event Study". Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-75418.

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The aim of this study is to investigate if individuals reacts rational to the announcement of negative profit warnings in the Swedish stock market. This is done by using an event study approach, investigating the corresponding abnormal returns and cumulative abnormal returns before, during, and after the announcement. Tests is also made to see whether qualitative and quantitative profit warnings and firm size has any impact on the cumulative abnormal returns. The sample consists of 176 profit warnings from 2008 to 2018. On the announcement day, the average abnormal return at day zero was -6.99 % and the average cumulative abnormal returns at day zero and one was -9.06 %. The results found also that smaller firms generate lower abnormal returns on the announcement date, but that there is no difference between qualitative and quantitative profit warnings. With small and insignificant cumulative abnormal returns before and after the announcement, the reached conclusion is that the market is efficient on aggregate level during the event of negative profit warnings.

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Word, Jeffrey B. "The Event-Centric Enterprise : A Multiple Case Study Analysis and Theoretical Framework for Event-Centric Business Processes". Thesis, University of Manchester, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518551.

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Werner, Axel, e Daniel Mårtensson. "Option markets impact on stock markets : An event study". Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Företagsekonomi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-18649.

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In this study we examine the stock price response around interim reports and the differ-ence between companies with listed stock options and companies without is measured. The focus of the study is OMX Nordic large cap list during the years 2010 and 2011 which gave us a sample of 1096 interim reports. A conventional event study were per-formed where the abnormal return around the release of the interim report were meas-ured. The abnormal returns were not different from zero at the 95% confidence level for the pre and post-announcement period. Abnormal returns on the event day were differ-ent from zero at the 95% confidence level in all cases and companies with listed stock options had a significantly higher abnormal return. We found a difference around one percent in stock price response between the two types of companies. The size and the systematic risks of the companies had a significant correlation to abnormal returns but none of them fully explained the differences between the two types of firms. Either the option market causes this difference or an untested systematic difference does.

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20

Carson, Jeffrey L. "A study of a rapid cyclogenesis event during GALE/". Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23414.

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An explosive cyclone that developed during intensive observation period (IOP)9 of the Genesis of Atlantic Lows Experiment (GALE) is studied. Detailed surface analysis is conducted based on operationally available data, late reporting ship observations and special observations acquired by GALE scientists to determine the surface storm track and deepening rate. GALE dropsonde and rawinsonde data are used to supplement the normal upper-level data base, and are analyzed by the Navy Operational Regional Analysis and Prediction System (NORAPS) using optimal interpolation objective analysis. These analysis are discussed with special emphasis given to possible factors contributing to the explosive cyclogenesis. Factors that influenced the cyclone's rapid development include upper-level positive vorticity advection, low-level warm temperature advection and low-level instability. Vertical soundings and cross-sections utilizing the dropsonde and rawinsonde data are used to study the environment in which the rapidly deepening cyclone initially developed. Keywords: Marine cyclogenesis, Coastal regions, North Atlantic Ocean, Winter storms, Meteorological data acquisition, Synoptic meteorology, Vorticity advection. Theses. (edc)

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Schulze, Katja Kristina. "Event-related potentials in bipolar disorder : a family study". Thesis, King's College London (University of London), 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437286.

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MIHAGUTI, FATIMA YUKARI FUKUSHIGUE. "PROCUREMENT STRATEGIES: CASE STUDY ON A SPORTS MEGA EVENT". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=26138@1.

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As estratégias de compra adotadas pelas organizações têm sido fundamentais para que elas se mantenham competitivas e atendam as demandas de produtos e serviços que seus clientes necessitam. Essa dissertação avalia a aplicação das metodologias de Kraljic, Porter e PESTEL na definição de estratégias para a área de compras e contratações, com o objetivo de atender às necessidades da organização responsável pela realização de um Megaevento Esportivo de forma eficaz e efetiva. Dentro deste tema, são abordadas as características que configuram a complexidade e a criticidade deste cenário particular, configurado por uma organização temporária para atendimento de necessidades do maior Megaevento Esportivo mundial com definições inflexíveis de prazo e custo. A dissertação em questão visa desenvolver por meio da metodologia de estudo de caso a apresentação de estratégias diferenciadas para cada tipo de item a partir da análise das diversas variáveis utilizadas na realização de uma contratação. O objetivo foi avaliar a aplicabilidade das teorias tradicionais da área de compras e suprimento ao caso específico, de um Megaevento Esportivo. Uma contribuição desta dissertação em relação a outros estudos voltados a megaeventos deste porte foi o foco nos processos relacionados à área de suprimentos. Além de tratar o tema em um contexto empresarial único e em um ambiente específico, onde as condições e restrições do mercado fornecedor e as legislações específicas do país e cidades sedes impactam nas estratégias. Em particular, esse estudo de caso compara o tipo de estratégia de contratação adotado no Megaevento Esportivo com as estratégias apresentadas nas teorias acadêmicas do tema, e ressalta as principais dificuldades vivenciadas e soluções mitigadoras aplicadas, em função das especificidades deste caso.
The procurement strategies used by the organizations have been crucial so they can be kept competitive and meet demand of products and services that their clients need. This dissertation evaluates the applicability of the methodologies of Kraljic, Porter and PESTEL on the definition of strategies for the procurement and hiring department, with the objective of meeting the needs of the organization responsible for the execution of a Sports Mega event in an effective and efficient manner. In this theme, it is approached the characteristics that configure the complexity and criticality of this particular scenario are approached, configured by a temporary organization to meet the needs of the biggest Sports Mega event with inflexible definitions on timing and cost. The dissertation aims to develop through a methodology of a case study the presentation of differentiated strategies for each type of item through an analysis of diverse variables used on the making of a purchase. The objective was to evaluate the applicability of the traditional procurement field theories onto a specific case, of a Sports Mega event. An additional contribution of this dissertation regarding other studies focused on mega events of this size is the focus on the processes related to the procurement area. Besides treating the theme in a unique enterprise context and in a specific environment, where the conditions and supply market restrictions and specific legislation of the main country and city impact on the strategies. In particular, this case study compares the type of procurement strategy adopted in the Sports Mega event with the strategies presented on the academic theories on the theme, and points out the main difficulties experienced and mitigation solutions applied, due to the specificities of this case.

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Cam, Marie-Anne, e marie cam@rmit edu au. "The Impact of Terrorist Attacks on Financial Markets". RMIT University. Economics, Finance & Marketing, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080731.102528.

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This thesis investigates the impact of terrorist attacks on equity financial markets. It employs traditional event study approaches to identify and measure stock market reactions to terrorist attacks in New York on September 11, 2001, and subsequent terrorist attacks in Madrid, London and Bali. Three studies are presented. The first study investigates the impact of September 11 on the tenant firms within the World Trade Centre. The second study investigates industry effects following the Madrid and London bombings. The third study undertakes a sensitivity analysis to different event study techniques over the various terrorist attacks. The results from the three studies suggest that equity markets can remain efficient in the wake of terrorist events. Terrorist events can trigger large abnormal movement in both equity prices and volume traded. These price and volume effects are influenced by industry effects. Terrorism has a differential impact on stock markets and industry portfolios within stock markets. The detailed analysis presented in this thesis can be used to exploit that industry effect and can be employed to guide diversification strategies that could minimize terrorist risk through industry diversification. The thesis has also evaluated alternative event study methods and produced a critical analysis of event study methodology. It shows clearly that methodological choices can and do significantly influence results. The thesis contributes to eliminating some uncertainty about the markets response to terrorist events, and identifies opportunities for reducing terrorist risk in stock markets.

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Hansson, Gusten, e Philip Hausenkamph. "Financial Magazines impact on the Swedish Stock Market : An event study". Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-85638.

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The purpose of this study is to investigate the effect of a stock recommendation from the leading financial magazines in Sweden. The study aims to measure the impact a recommendation illustrates in true value. The measurements are mean abnormal returns (AR), mean cumulative abnormal returns (CAR) and mean abnormal volume (AV). Conducting an event study to monitor, not only the date of announcement, but to also validate or invalidate the recommendation as a fundamental changer in the stock case. Where the calculations are made before, on and after the event occurs. With the aim to test if the market is efficient and in line with the rational theories, or if there are other explanatory theories, like the behavioral financial approach, that can explain the results. The sample consists of 571 recommendations that have been announced 2017 and 2018, divided into categories of buy and sell. The sample of buy and sell are also tested in subcategories of small and large companies, to measure the impact due to size of the firm, as a dependent variable. The empirical results shows that there are AR and AV existing due to recommendations. Small companies have the highest measured AR, with sell recommendations having the largest effects. The sell recommendations changes the value and the fundamentals of the stocks, while buy recommendations react positive to the recommendations on the day of announcement, then reverses back to the same price in the end of the event window. Suggesting that the market act both efficient and rational, but also irrational and ineffective, depending on what type of recommendation that is being released and how large and well monitored the company, that gets the recommendation is.

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Jain, Sulabh. "Event-Driven Dynamic Query Model for Sleep Study Outcomes Research". Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1323377417.

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Seurkamp, Meredith. "NASCAR Sponsorship: Who is the Real Winner? An Event Study Proposal". Miami University Honors Theses / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=muhonors1146069495.

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Johansson, Martin, e Johanna Nederberg. "Earnings Announcements In The Credit Default Swap Market - An Event Study". Thesis, Uppsala universitet, Företagsekonomiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226706.

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This paper investigates the European CDS markets response to earnings announcements between the years 2011-2013. Through the use of event study methodology, we investigate if the CDS market reacts to earnings news in terms of abnormal spread changes. Furthermore, by exploring the pre- and post announcement window the study examines the efficiency of the CDS market. The results imply that earnings announcements provide valuable information to the CDS market, with statistically significant results on the 5 % and 10 % significant level for negative and positive news respectively. Additionally, the paper shows that the market has a rather symmetric reaction to negative and positive earnings news since there is no significant difference in effects. The paper further reveals that there is no significant difference in the response between different credit rating groups. In terms of market efficiency, the study cannot confirm that there is anticipation for earnings announcements. The study further shows that there is no post-earnings announcement drift in the CDS market and that the market, overall, is efficient in incorporating the information into the spreads. Finally, a cross-sectional regression analysis confirms that negative earnings surprises are linked to large announcement day reactions, while positive earnings surprises are not.

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28

Li, Qing. "Recurrent-Event Models for Change-Points Detection". Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/78207.

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The driving risk of novice teenagers is the highest during the initial period after licensure but decreases rapidly. This dissertation develops recurrent-event change-point models to detect the time when driving risk decreases significantly for novice teenager drivers. The dissertation consists of three major parts: the first part applies recurrent-event change-point models with identical change-points for all subjects; the second part proposes models to allow change-points to vary among drivers by a hierarchical Bayesian finite mixture model; the third part develops a non-parametric Bayesian model with a Dirichlet process prior. In the first part, two recurrent-event change-point models to detect the time of change in driving risks are developed. The models are based on a non-homogeneous Poisson process with piecewise constant intensity functions. It is shown that the change-points only occur at the event times and the maximum likelihood estimators are consistent. The proposed models are applied to the Naturalistic Teenage Driving Study, which continuously recorded textit{in situ} driving behaviour of 42 novice teenage drivers for the first 18 months after licensure using sophisticated in-vehicle instrumentation. The results indicate that crash and near-crash rate decreases significantly after 73 hours of independent driving after licensure. The models in part one assume identical change-points for all drivers. However, several studies showed that different patterns of risk change over time might exist among the teenagers, which implies that the change-points might not be identical among drivers. In the second part, change-points are allowed to vary among drivers by a hierarchical Bayesian finite mixture model, considering that clusters exist among the teenagers. The prior for mixture proportions is a Dirichlet distribution and a Markov chain Monte Carlo algorithm is developed to sample from the posterior distributions. DIC is used to determine the best number of clusters. Based on the simulation study, the model gives fine results under different scenarios. For the Naturalist Teenage Driving Study data, three clusters exist among the teenagers: the change-points are 52.30, 108.99 and 150.20 hours of driving after first licensure correspondingly for the three clusters; the intensity rates increase for the first cluster while decrease for other two clusters; the change-point of the first cluster is the earliest and the average intensity rate is the highest. In the second part, model selection is conducted to determine the number of clusters. An alternative is the Bayesian non-parametric approach. In the third part, a Dirichlet process Mixture Model is proposed, where the change-points are assigned a Dirichlet process prior. A Markov chain Monte Carlo algorithm is developed to sample from the posterior distributions. Automatic clustering is expected based on change-points without specifying the number of latent clusters. Based on the Dirichlet process mixture model, three clusters exist among the teenage drivers for the Naturalistic Teenage Driving Study. The change-points of the three clusters are 96.31, 163.83, and 279.19 hours. The results provide critical information for safety education, safety countermeasure development, and Graduated Driver Licensing policy making.
Ph. D.

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29

Irani, Mohammad. "Essays on Mergers and Acquisitions and Event Studies". Doctoral thesis, Stockholms universitet, Företagsekonomiska institutionen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-130260.

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This dissertation consists of three studies on the anticipation of mergers and acquisitions (M&As) and its impact on takeover event studies. Article I investigates whether the market can anticipate both takeovers and their payment forms prior to their announcement dates. This article also proposes a new time-series approach for detecting the ex-ante deal-anticipation and payment-form anticipation dates. The results indicate that the majority of deals and their payment forms are anticipated much earlier than has been documented in previous takeover studies. Moreover, controlling for the anticipation dates matters for explaining the choice of payment method in M&As. Article II studies how assuming that M&As are unpredictable during the estimation window affects the measurement of abnormal returns. The results show that a part of takeover synergy is indeed incorporated into the stock prices during the estimation window of previous studies, around the deal-anticipation dates. This article estimates the parameters of the expected return model from the pre-anticipation period to control the consequences of ex-ante anticipation on the estimates of abnormal returns. Using the anticipation-adjusted approach significantly improves the estimation of the event-window abnormal returns, and provides new insights into some well-documented takeover results. Article III examines how the abnormal returns are affected when a standard event study assumes that the parameters of the expected return model are stable. Using a sample of firm takeovers, the results indicate that the parameters are indeed unstable. This article introduces a time-varying market model to account for the dynamics of merging likelihood when it estimates the abnormal returns. The findings show that the stability assumption causes a standard event study to overestimate significantly the abnormal returns to the target and acquirer shareholders.

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Manuscript. Paper 2: Manuscript. Paper 3: Manuscript.

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Edlund, Malin, e Henny Gerdin. "Event Marketing and Recruitment : A qualitative study of What Companies in Northern Sweden Think About Event Marketing and Recruitment". Thesis, Umeå universitet, Handelshögskolan vid Umeå universitet, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-36523.

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31

Salihu, Krenare, e Zetterström Ludwig Flank. "Analyst recommendations and abnormal returns : An event study on OMX Stockholm 30". Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-104457.

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Abstract (sommario):

The main purpose of this study is to contribute to the previous literature by evaluating positive changes in analysts' consensus recommendations of the stocks listed in OMXS30. We analyze if new positive changes in consensus recommendations correspond with lower abnormal returns. By conducting an event study and performing a series of different statistical tests, we find that positive changes in analyst consensus provide a short lived negative mean abnormal return in certain cases. We argue that this implies that investors might interpret positive changes as a sell signal. Furthermore, we find some pieces of evidence to suggest that it may actually be changes in the mean target price rather than changes in recommendations that causes the movements in abnormal returns.

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32

Bergquist, Philip, Patrik Lindgren e Olof Persson. "The Value of Change : An event-study of Ownership Disclosures". Thesis, Jönköping University, JIBS, Business Administration, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-310.

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Abstract (sommario):

Background:

Recent business paper articles observe that stocks soar when there is a change in ownership. The clothing company JC climbed 26% when it was announced Torsten Jansson had increased his holdings. Daydream, a computer game developer, followed this trend increasing its market value by 17% on the news that TA Capital had increased its hold-ings. In these examples, the market learned of the changes in ownership through a press release created by the acquiring entity. These pieces of news, also known as ownership disclosures, is the target of this thesis.

Purpose:

The purpose of this thesis is to investigate whether ownership disclosures result in abnormal stock price changes. Furthermore, the aim is to find out if there are any differ-ences in returns depending on who announced the ownership disclosure. In order to fulfil this purpose, a quantitative approach was used.

Method:

A random sample of 160 ownership disclosures is gathered. 77 of these are classified as passive- and 83 as active investors. For each of these pieces of news, 183 days of historical stock price data is retrieved. This data is then parsed through the market model event-study framework.

Findings:

Graphically analyzing the whole sample indicates that the market is not efficient in its strong form. The same is true when dividing the sample into passive- and active investors. Statistically, an abnormal return is confirmed for the active investors, but not for the whole sample or the passive investors.

Conclusion:

By looking at the price change effects of ownership disclosures, the Stockholm Stock Exchange O-list is determined to be efficient at the semi-strong level. The anomaly caused by active investors leads to the possibility of making a profit of 2.70% between day -1 and day +1 relative to the day of the ownership disclosure being sent out. It should be noted, though, that transaction costs and taxes are not taken into consideration.

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Angliss, Katie. "An evaluation of the impact of event attendance on perceptions of the host organisation's reputation : a university case study". Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/9822.

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Reputation is an important asset for organisations worldwide. Many researchers have attempted to develop a measurement construct to assess an organisation’s reputation, with the RepTrak System being recognised to be the world’s first tool that assess reputation across multiple stakeholders and areas of the organisation. Nevertheless, the characteristics, methods and stakeholders to include within an assessment of this intangible asset continues to be widely debated. Organisations are under intense scrutiny by their stakeholders, with reputation being an organisational asset on which many opinions are formed. Universities in the UK are no different, as they compete for students from around the world, with the institutions thought to have the best reputations, attracting more students. Nevertheless, no agreed measure for assessing a university’s reputation exists, with many organisations relying solely on league table rankings. Thus, this thesis evaluated existing reputation measurement characteristics, to determine their applicability in assessing the reputation of a UK university. The antecedents of reputation are also widely debated. Authors suggest that stakeholders’ prior knowledge and experience, and communication they receive from an organisation contributes to their perceptions of that organisation’s reputation. The Media Richness Theory suggests a hierarchy to this communication, with face-to-face communication recognised to be of increasing importance due to its ‘rich’ nature. Consequently, the use of events as a strategic communication tool for marketing and public relations purposes has become increasingly popular. Nevertheless, the impact of these events on an organisation’s reputation has yet to be assessed. Thus, the aim of x this thesis is to evaluate the impact that these events have on stakeholders’ perceptions of a UK university’s reputation. A case study methodology, using mixed methods, and underpinned by a pragmatic philosophical perspective was adopted. Five semi-structured interviews were held with senior managers during the first phase of data collection and analysis. Results from these interviews were used to determine the strategic purpose of events as a communication tool. In phase two of the research, the study’s main variables (Reputation, Event Influence, Knowledge and Familiarity, Future Intentions) are combined into a model to assess their relationships. These are tested using Structural Equation Modelling, and data collected from 23 university events and 592 event attendees, using a quantitative questonniare. This study contributes to our knowledge and understanding of the benefits of using events as a form of communication, and highlights the necessity of using a variety of communication channels to inform different stakeholder groups. Findings within this research contradict existing knowledge within the UK Higher Education Industry, by suggesting that university league tables were not the most frequently used method of assessing a university’s reputation, and that rather stakeholders base their perceptions on their personal experience with the institution. Consequently, attending events is found to have a positive influence on attendees’ perceptions of the university’s reputation, however a threshold level exists for stakeholders with high levels of familiarity with the university. Therefore, evidence of the impact of using events as a communication tool is found with a positive return on investment in terms of reputation gains. Thus, findings can be used to inform communication strategy within the higher education industry within the UK.

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Burns, Nicholas R. "Inspection time and cognitive abilities : an event-related potential study /". Title page, contents and summary only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phb9675.pdf.

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35

Wang, Mei. "On the study of mega-event impacts on housing market". Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648529.

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36

Dalebout, Susan D. "Event-related brain potentials in Parkinson's disease : a preliminary study /". The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487841548271694.

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37

Sutradhar, Adithi. "Social anxiety and threat perception : An event-related potential study". Thesis, Högskolan i Skövde, Institutionen för biovetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-19428.

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The late positive potential (LPP) is an event-related potential (ERP) component associated with increased affective processing which seems to strongly respond to threats and to be sensitive to emotional faces. Some studies indicate that the LPP is modulated by anxiety symptoms, while others fail to find support for these observations. The facial width-to-height ratio (FWHR) is a facial-masculinity metric that refers to cheekbone width, divided by upper facial height (top of the lip to between the brows). Consequently, FWHR has by some researchers been proposed to serve as a cue of threat. For example, high FWHR and diverse emotional faces (e.g., angry faces) are perceived as more threatening than low FWHR faces. Individuals with social anxiety are thought to be biased towards the threat. The literature has indicated that high FWHR faces in combination with angry facial expression can elicit larger LPPs compared to low FWHR and neutral faces. The current experiment investigated subjective ratings in addition to the LPP in response to high and low FWHR faces in combination with an angry and neutral expression, to examine how different facial morphology and affective cues influence the perception of threat to individuals with high social anxiety. This data, in combination, suggests that high FWHR is a salient threat-related social stimulus that might have a firm influence on the perception of other peoples’ faces. Initial results do not support a significant relationship between increased LPP modulation in individuals with high social anxiety compared to individuals with low social anxiety. However, it opens up for discussion regarding how social anxiety should be approached in future LPP research.

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38

Sunga, Tapuwa Terence. "Platinum share prices and the Marikana tragedy: an event study". Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013002.

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An event study is an economic tool of analysis that has begun to gain popularity in recent empirical literature. It is a technique that gives a researcher the opportunity to map out the reaction of a firm's stock to an event, usually making use of daily or monthly data. However, up to this point, event study methodology has generally been applied to more traditional phenomena capable of affecting equity value, such as dividend and macroeconomic policy announcements, and there have only been a few exceptions to this. This study looks at what impact the tragic shootings at Lonmin mine in Marikana on August 16th 2012 had on the share prices of platinum mining firms based in South Africa using event study methodology. It makes use of the technique to investigate how the share prices responded to the tragedy over a number of trading days, including the day of the shootings. To be best of our knowledge, no attempt has been made to analyse the impact on share prices using events of this nature. For the investigation, daily returns data was used for each firm. The abnormal returns and cumulative abnormal returns to each were then calculated and compared with their respective expected returns in order to determine whether investors in the shares of that particular firm reacted positively, negatively or not at all. The evidence found suggests that tragedies of this nature are capable of influencing share prices in the same manner as more traditional economic phenomena. Overall, only one firm was found to have been negatively affected by the shootings in a persistent manner, while the shares of the other firms examined reacted in a manner that was positive overall, but varied according to individual firm characteristics such as size. These finding conformed to our a priori expectations. In addition, the results also confirm the benefits of applying event study methodology to a wide variety of phenomena that fall outside the boundaries usually associated with business.

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Balderston, Catherine C. "Recognition Memory for Emotional Words: An Event Related Potential Study". [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002510.

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40

Peterson, Lloyd G. "Lean/flow design event a manufacturing cost reduction case study /". Online version, 2004. http://www.uwstout.edu/lib/thesis/2004/2004petersonl.pdf.

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41

HUANG, Ying-chang, e 黃盈璋. "Lin Shuang-Wen Event Study". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/25533391286339025832.

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碩士
國立臺灣師範大學
歷史學系在職進修碩士班
99
Lin Shuang-Wen Event took place during the latter half of the Emperor Kao Tsung’s rule in the Ching Dynasty. In that time, Taiwan locals were accustomed to form organized associations to protect themselves. The officials, however, used high-handed measures to put down such organizations. As a result, Heaven And Earth Association led by Shuang-Wen Lin rebelled against the government. Owing to Chief General Chai Da-ji’s timidity and procrastination during the onset of the riots, the rebellion gradually spread out. Even with the reinforcement from the mainland led by army general Huang Shi-jian and navy general Jen Chen-en of Fu Jian province under the supervision of Governor-general of Hu-Guang provinces Chang Ching, the rebellion could not be suppressed and lasted for over one year. Not until Emperor Kao Tsung assigned General Fu Kung-an, in whom he trusted greatly, to lead elite combat forces from several provinces, did the stalemate be broken. After Lin Shuang-Wen Event, Ching dynasty adjusted its controlling policy regarding Taiwan. Among many adjustments were three major changes: (1) Increase of official harbors: More official harbors were opened in northern Taiwan, which helped stimulate local prosperity. (2) Establishment of military farming system: Military farming system promoted the communication among different aboriginal tribes and consequently attributed to the establishment of a new social class and to the dwindling of the population in tribes’ villages. (3) Building city walls: The long official ban on building walls around cities was lifted. In terms of forces mobilized, areas affected and the implication followed, Lin Shuang-Wen Event was the largest insurgency in Taiwan during the Ching Dynasty.

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42

Tsay, Kuen-Fang, e 蔡坤芳. "Event study metheodology in Taiwan". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/50030243553013841600.

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43

Hou, Pin-liang, e 侯秉良. "Case Study of training event achievement". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/4hmzwc.

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Abstract (sommario):

碩士
國立中山大學
人力資源管理研究所
95
Changing the fast now society, enterprises must enable staff to study new knowledge , new technical ability fast through training , improve staff''s ability , the change that should be tight day by day and severe , so, a part that enterprises handled education and training and already became enterprise''s business activities. Training is a kind of method of changes and a kind of means of helping the staff to study , meet the environment fast fast, one of the advantage important methods that education and training is also organized to maintain the competition. In order to know that enterprises handle the course wholly of the education and training activity , this research adopts the law of case study (Case study ), probe into and regard a company as the research object. The collection of the materials is with file and statistical data correlating with education and training inside the case company, if education and training branch can organization the operation , education and training one system and promotion structure , the implementation way of doing thingses of education and training and can''t train project of assessing etc. of, to probe into the course that the case company implement education and training. It is personal while carry out education and training actually to add a researcher, person , thing , thing observed, propose the relevant real example. Discover that the case company is training the demand , adopt subjective consciousness to draft the drill program, benefit smaller in improving staff''s ability ; On not is it implement to training, course hours short, make course to be theme unable to deepen the discussion, the staff''s results of learning is not good; On not is it assess to training , is it write and become a mere formality with gains to test , can''t weigh the staff''s study effect . Propose the way of doing things of the suggestion finally, offer enterprises to want to handle the reference of the education and training activity.

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Cheng, Kuang-Chao, e 鄭光超. "Event Study of Intelligence Vehicle Development-". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ef8eu9.

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碩士
國立東華大學
國際企業學系
106
The purpose of this thesis it to investigate whether there is an abnormal return of the stock prices of the firms of which the operations are related to intelligence vehicle industry given announcement of the advance or milestone of key developers, such as Google and Baidu. Google and Baidu launched a cutting edge car on Dec.22 2014 and Jul.5 2017 separately and this study use the two dates as the event day to identify the impact of the announcement. Taiwan’s firms in the fields of car components, car electronics and electric car play an important role of the global supply chain of intelligence vehicle industry are a suitable sample of this research. Employing the financial data from TEJ (Taiwan Economic Journal) and event study method, the findings of the research are the announcement Google’s intelligence vehicle has a positive impact on the abnormal return of the firms related to Taiwan’s car components. In addition, the announcement Baidu’s intelligence vehicle is also positively related to the abnormal return of the firms related to Taiwan’s car components. Combining the two events across different time horizon, the positive abnormal return is still significant. With the development of intelligence vehicle, the firms related to Taiwan’s car components can play an important role in the global supply chain of IoV as well as good investment targets to the investors.

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CHEN, PO-YU, e 陳柏宇. "The event study of virtual currency". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/eehu3h.

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Abstract (sommario):

碩士
亞洲大學
財務金融學系碩士在職專班
107
According to the definition of economics, the currency does not have to be a reality material. When the society goes to technological civilization, many economic activities are not just only the reality trade. With the development of high technology, and the internet generation rising, the appearance and application of Virtual Currency makes much impact on reality economy now, even direct effects people’s consuming behavior and the country economy. In this paper, we do discuss and research for the Virtual Currency’s connection of trading market by using Event Study between 2016 and 2017, and using abnormal return testing, single population testing and causation testing by choosing 2 material money and 2 much representative Virtual Currency on open market. This research shows three results: 1. Most response of virtual currency and material money in different events are positive. 2. There is no overreaction or underreaction between virtual currency and material money. 3. The causation between kinds of currency has no consistency relationship.

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46

MA, CHIH-KANG, e 馬治綱. "A Study of Sponsor-event Fit and Sponsorship Benefit for the Sport Event". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/65194138632852895994.

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碩士
國立體育大學
休閒產業經營學系
105
In recent years due to the sponsorship flourished events everywhere, causing the entire sports market began to flourish. However, many enterprises into the impact, causing chaos sponsors, vulnerable to ambush marketing. Therefore, unable effectively carrying out the official sponsors and the link will cause sponsorship ineffective, but also reduces the effectiveness of sponsorship. The purpose of this thesis was that from a cognitive perspective, with the concept of fit, to explore different degrees of sponsor-event fit, to differ on the effectiveness and impact of attitude toward sponsoring brand and sponsorship effect. The participants were 275 adidas winter league players and spectators. Based on the descriptive statistical analysis, t-test, one-way ANOVA and Pearson correlation analysis, the following conclusions were found: the main participants of adidas winter league were aged 20 or less High school / technical school students, with an average monthly income of less than NT$ 10,000. Besides, there were differences among participants’ demographics on the sponsor-event fit and sponsorship effect. Also, there were correlated relationship among the sponsor-event fit, attitude toward sponsoring brand, and sponsorship effect. This study suggests that sponsors should emphasize the fit between the event by surrounding activities to complement or enhance awareness of the fit.

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Chen, Chun-hung, e 陳俊宏. "Empirical Study of Different Capital-Reducing Event". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/23157857276817744016.

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碩士
雲林科技大學
財務金融系碩士班
96
This is an empirical study of the different capital reduction event. The samples are using the companies which first announcement of capital-reducing from 2004 to 2007/06. This research uses event study to examine 2 types of capital reduction behaviors, capital reduction by cash refund and capital reduction for offset to cumulative loss, what is the stock price reaction on the first announcement and the finalizing capital reduction process, if there are significant differences in stock price reaction to the 2 types of capital reduction behavior? Finally, we use the regression model to examine factors influenced the stock price reaction in samples of first announcement. The empirical results show that the stock price reaction of capital reduction by cash refund was significantly positive, but significant negative in capital reduction for offset to cumulative loss on the first announcement. Therefore the stock price reaction was really significant different in this 2 types of capital reduction on the first announcement. The stock price reaction was significant positive 2 types of capital reduction in finalizing capital reduction process day. Finally we find that the reason and the credit transaction influenced the stock price reaction in samples. The stock price reaction was negative when the reason was an offset to cumulative loss. If the book value can rise above 10 dollars after finalizing capital reduction process, the stock price reaction was positive.

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Lin, Chang Hong, e 林昶宏. "A Study on Robust Sound Event Recognition". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/vg9tn5.

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Abstract (sommario):

博士
國立中央大學
資訊工程學系
102
In recent years, environmental sound recognition has become a new research topic in home automation. In home automation systems, the sound recognized by the system becomes the basis for performing certain tasks. However, there are various disturbances which may cause recognition system to fail in real world applications. For example, a target source is mixed with another sound due to simultaneous occurrence, or the sound received by the applications is exposed to background noise. To resolve these two issues, we totally propose three robust processing methods in this dissertation. We firstly propose a mixed sound verification method to deal with simultaneous occurrence of sounds. For the problem of background noise, this dissertation adopts two approaches to reduce the impact on recognition. The first approach is sound enhancement, which suppresses the noise of received sound before feature extraction. The second approach is to simultaneously remove noise and extract feature (implements feature extraction and denoising simultaneously), called robust feature extraction. To handle the problem of simultaneous occurrences of multiple sounds, this study proposes a framework, which consists of sound separation and sound verification techniques based on a wireless sensor network (WSN). For the problem of reducing noice from the input audio, we propose a fast subspace based sound enhancement method to filter background noise on signal subspace. For the approach of robust feature extraction, we proposed a novel feature extraction approach called nonuniform scale-frequency map for environmental sound recognition. Furthermore, the experimental results demonstrate the robustness and feasibility of the three proposed systems are superior to baseline systems.

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Chiu, Tzu-Cheng, e 邱梓誠. "A Study of Updating GPS Traffic Event". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/50907795877471861272.

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Abstract (sommario):

碩士
朝陽科技大學
資訊管理系
102
Owing to the raising of national income, the car ownership rate and road usage are on the increase in recent years. Therefore, the transportation network of quantity has been increasing constantly. In addition, the road information is not in a stable situation, there may cause the traffic problems at any time, such as the road closures, traffic accidents or road conditions. Therefore, this research proposes a map update mechanism of GPS interaction with cloud computing unlike currently offline updating of a whole map. Through the connection of cloud computing, it will update the map information immediately and help to exclude the traffic problems when the car passes through the junction. It makes the user arrive the goal in the shortest time and accelerate the efficiency and immediacy of updates. In this paper, we will do the simulation according to real traffic situation, which means it might meet bad traffic during a ride. During the experiment, some random events were added to represent this section of the road is in a bad situation, if we detect the next section is not good to drive, we will replanning another path to avoid driving into traffic jam, so you can arrive your destination smoothly. After a ride, we will get how many times the bad section we had meet, then repeat this experiment for several times to get the average number of the bad sections we will meet during one ride. Our mechanism only need to update the average number of bad sections but not need to do full update, from the experimental results, we will get much improvement comparing with the traditional RDS-TMC method.

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Hung, Ching-Lin, e 洪慶霖. "A Study of Event and Opinion Summarization". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/47545827380310448133.

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