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  • 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.
1

Bacias crivadas em sistemas mecânicos e biológicos e estudo da variabilidade da frequência cardíaca / Riddled basins of attraction in mechanical and biological systems and heart rate variability study

Camargo, Sabrina 11 December 2009 (has links)
Um estudo de bacias crivadas e um estudo de séries de batimentos cardíacos através de ferramentas não lineares são apresentados. Bacias crivadas ocorrem em sistemas não lineares onde a simetria do espaço de fase permite a existência de um subespaço invariante capaz de atrair e repelir órbitas. Como conseqüência para todo ponto pertencente a bacia de atração do atirador existirá um ponto não pertencente numa distância arbitrariamente próxima. Pode-se verificar a presença de bacias crivadas pela análise do espaço de fase e dos expoentes máximos transversais de Lyapunov de tempo finito. A caracterização do fenômeno pode ainda ser complementada pelas leis de escala provenientes de um modelo para as flutuações dos expoentes máximos transversais de Lyapunov de tempo finito. O crivamento é analisado para um sistema mecânico e para um modelo ecológico. Comparamos para os dois sistemas as previsões teóricas, dadas por um modelo stocástico, com os resultados numéricos. No estudo de séries de batimentos cardíacos diversos grupos de dados são submetidos a diferentes análises a fim de determinar ´ndices que permitam, dado um paciente, decidir a qual grupo ele pertence. Expoentes de Lyapunov, análise depurada de flutuações e segmentação das séries foram empregados na análise das séries de intervalos RR e pressão arterial. Desses métodos empregados, nenhum foi conclusivo no sentido de caracterizar os grupos. Porém, uma nova formulação do método de segmentação das séries mostrou ser possível a caracterização através de um parâmetro, que todavia, exige séries longas de observação. / A study of riddled basins of attraction and a study of heart rate variability through nonlinear dynamics tools are presented. Riddled basins occur in nonlinear systems whose phase space symmetry allows an invariant subspace with an chaotic attractor. This invariant subspace can either attract or repel orbits. As a consequence, for every point belonging to the basin of attraction there is another point, arbitrarily close, that does not belong to the basin of attraction. The presence of riddled basins is verified by analyzing the maximal transversal Lyapunov exponent and the maximal transversal finite time Lyapunov exponent. The characterization of riddling is complemented by the calculation of scaling laws provided by a stochastic model of the transversal finite time Lyapunov exponents. Riddling is analyzed for a mechanical system and for an ecological model. The results are compared with the theoretical prediction given by the stochastic model. In the study of heart rate variability, time series of different groups were analyzed in order to determine quantifiers of healthiness and sickness, in the sense that given a patient one can say if the patient belongs to a healthy group or not. Lyapunov exponents, detrended fluctuation analysis and time series segmentation were applied to RR-intervals and blood pressure time series. These methods were not able to characterize the groups. However, a new formulation of the segmentation method indicates that it is possible to find a quantifier, although this quantifier requires long time series of observation.
2

Bacias crivadas em sistemas mecânicos e biológicos e estudo da variabilidade da frequência cardíaca / Riddled basins of attraction in mechanical and biological systems and heart rate variability study

Sabrina Camargo 11 December 2009 (has links)
Um estudo de bacias crivadas e um estudo de séries de batimentos cardíacos através de ferramentas não lineares são apresentados. Bacias crivadas ocorrem em sistemas não lineares onde a simetria do espaço de fase permite a existência de um subespaço invariante capaz de atrair e repelir órbitas. Como conseqüência para todo ponto pertencente a bacia de atração do atirador existirá um ponto não pertencente numa distância arbitrariamente próxima. Pode-se verificar a presença de bacias crivadas pela análise do espaço de fase e dos expoentes máximos transversais de Lyapunov de tempo finito. A caracterização do fenômeno pode ainda ser complementada pelas leis de escala provenientes de um modelo para as flutuações dos expoentes máximos transversais de Lyapunov de tempo finito. O crivamento é analisado para um sistema mecânico e para um modelo ecológico. Comparamos para os dois sistemas as previsões teóricas, dadas por um modelo stocástico, com os resultados numéricos. No estudo de séries de batimentos cardíacos diversos grupos de dados são submetidos a diferentes análises a fim de determinar ´ndices que permitam, dado um paciente, decidir a qual grupo ele pertence. Expoentes de Lyapunov, análise depurada de flutuações e segmentação das séries foram empregados na análise das séries de intervalos RR e pressão arterial. Desses métodos empregados, nenhum foi conclusivo no sentido de caracterizar os grupos. Porém, uma nova formulação do método de segmentação das séries mostrou ser possível a caracterização através de um parâmetro, que todavia, exige séries longas de observação. / A study of riddled basins of attraction and a study of heart rate variability through nonlinear dynamics tools are presented. Riddled basins occur in nonlinear systems whose phase space symmetry allows an invariant subspace with an chaotic attractor. This invariant subspace can either attract or repel orbits. As a consequence, for every point belonging to the basin of attraction there is another point, arbitrarily close, that does not belong to the basin of attraction. The presence of riddled basins is verified by analyzing the maximal transversal Lyapunov exponent and the maximal transversal finite time Lyapunov exponent. The characterization of riddling is complemented by the calculation of scaling laws provided by a stochastic model of the transversal finite time Lyapunov exponents. Riddling is analyzed for a mechanical system and for an ecological model. The results are compared with the theoretical prediction given by the stochastic model. In the study of heart rate variability, time series of different groups were analyzed in order to determine quantifiers of healthiness and sickness, in the sense that given a patient one can say if the patient belongs to a healthy group or not. Lyapunov exponents, detrended fluctuation analysis and time series segmentation were applied to RR-intervals and blood pressure time series. These methods were not able to characterize the groups. However, a new formulation of the segmentation method indicates that it is possible to find a quantifier, although this quantifier requires long time series of observation.
3

Ett parti i marknadsföring : Strategier på en föränderlig spelplan / A match in marketing : Strategies for an ever changing gameplan

Turesson, Sofi, Ottosson, Johanna January 2012 (has links)
På modemarknaden råder idag en stor konkurrens och det blir allt svårare att differentiera sitt företag. Ett ökat mediebrus distraherar kontinuerligt det budskap företaget vill sända ut till kundgruppen. Idag tvingas företagen ta ett allt större socialt ansvar främst av kommersiella skäl. Miljöengagemanget blir allt större och framför allt attityden och beteendet hos konsumenterna leder till en annan slags konsumtion eller rent av till en ny trend. Utifrån problematiseringen har vi undersökt, beskrivit samt analyserat marknadsförings-strategin av en kedjeägd- respektive en privatägd butik. De utvalda butikerna blev Brothers & Sisters i Borås City respektive Centrum Manufaktur i Alingsås. Fokus låg på jämförelsen av marknadsföringen mellan två butiker, där en är centralstyrd och ingår i en kedja medan den andra är en enskild butik som är styrd i privat regi. Hur miljöperspektivet inkluderas i kommunikationen berördes också. Vi kartlagde skillnader och likheter samt fördelar och nackdelar med butikernas kommunikation och påverkan. De datainsamlingstekniker som har legat till grund för undersökningen är två personliga intervjuer och två enkäter. Intervjun har skett i möte med respondenten för respektive företag. Enkätundersökningen har genomförts på stan i Alingsås och Borås med ett icke sannolikhetsurval av respondenter. Undersökningen visade att både Brothers & Sisters och Centrum Manufaktur använder sig främst av interna åtgärder för att konkurrera och skapa lönsamhet. Den övergripande strategin för att skapa differentiering och påverkan är genom valet av tre faktorer; service, sortiment och människor. Det som skiljer företagens marknadsföringsstrategier åt är valet av informationskanaler i marknadskommunikationen, organisationens uppbyggnad samt varumärkena som ingår i sortimentet. Företagen lyckas med att kommunicera ett starkt sortiment och god service då kunden förknippar företagen med just de här faktorerna. Att döma utifrån de genomförda intervjuerna och enkätundersökningarna blir det tydligt att en butik tillhörande en kedja samt en butik som bedrivs i privat regi, kan ha likvärdiga strategier och stöta på liknande problem när det gäller marknadsföringen och dess genomslagskraft.The fashion market is today highly competitive and it becomes increasingly difficult to differentiate their businesses. An increased media noise continually distracts the message the company wants to send to the client group. Today, companies are forced to take greater social responsibility mainly for commercial reasons. Environmental commitment is increasing, and above all the attitude and behavior of consumers leads to another kind of consumption or even to a new trend. From the issue we have examined, described and analyzed the marketing strategy of a chainstore and a privately owned shop. The selected stores were Brothers & Sisters in Borås City and Centrum Manufaktur in Alingsås. The focus was on comparison of marketing between the two stores, one of which is part of a chain while the other is a single store that is operated privately. The environmental aspect included in the communication was also a part of the study. We map minded, similarities and differences, advantages and disadvantages of store communication and the influence on the market. The data collection techniques that were the subject of the investigation are two personal interviews and two surveys. The interview took place in a meeting with the respondent for their respective companies. The survey has been carried out on the town in Alingsås and Borås with a non-probability sample of respondents. The investigation revealed that both Brothers & Sisters and Centrum Manufaktur mostly uses internal measures to compete and operate profitably. The overall strategy for creating differentiation and impact is through the choice of three factors: service, assortment and people. What distinguishes the firms marketing strategies were the selection of information channels of marketing communication, organization structure and the brands included in the assortment. The companies manage to communicate a strong range and good service when the customer associate companies with just these factors. Judging from the interviews and questionnaires, it becomes clear that a shop belonging to a chain and a store that is conducted in private, may have similar strategies and encounter similar problems in terms of marketing and its impact. / Program: Butikschefsutbildningen
4

電子連接器產業經營策略之研究-以個案公司為例

王世明, Wang , Hans Unknown Date (has links)
本研究旨在針對電子連接器產業進行探索性研究,期能發現占據相當重要關鍵零組件地位的連接器,其產業態勢與競爭條件。本研究固然與傳統的研究方法相同,運用Aaker的策略分析架構進行探討,但亦頗多創新之處,譬如納進Porter的國家競爭力分析模型,討論產業與政府等因素間的相互依賴狀況,又納入司徒達賢的策略矩陣分析構面,討論個案公司與其他同業之間的競爭模型。本研究雖以個案公司為研究對象,但旁及其他競爭性公司共同討論,以了解個案公司的產業定位與遭遇的挑戰。 / This study is exploring the advantage of competition in Connector industry. It adopted Aaker’s model, which designed by strategic method to depict a SWOT to overall analysis of connector industry as well as Case Study Company. The main contribution is to offer a position within industry where has a vital network can help others to sustain the strong power. However, the environment is not as good as past, the trend will bring a move to mainland China, and the new competitors will appear, the Industry ought to encounter more challenge than have been met in Taiwan. This study has some characters involve in the National competitive model and the strategic matrix analysis method from Dr. Seeto. There are many persons were called on to the Case interview, However, only certain firms would be selected as delegation out of this industry.
5

K interferenci češtiny, ruštiny a angličtiny v jazykové výuce / On interference between Czech, Russian and English in language learning

Dvořáková, Jana January 2011 (has links)
The thesis deals with second language acquisition (SLA) of Czech in Russian and English students. It presents the main theories of SLA (generative and cognitive approaches) and compares them to the results of author's research into L2 acquisition of Czech morphology and syntax in speakers of two typologically and structurally different mothertongues. It shows that language transfer plays an important role in SLA and that some of the generative assumptions about SLA that are claimed to apply universally cannot be proven for Czech.
6

考量消費者行為與供應商價格競爭之零售商價格競爭模式之研究 / A Study on Pricing Competition Model of Retailer with Learning Behavior of Consumer and Competition of Supplier

鄧廣豐, Deng, Guang Feng Unknown Date (has links)
在複雜動態競爭市場中,生產者的價格競爭行為一直是一個研究的重點,相較於生產者動態價格競爭,零售商的價格競爭行為鮮少被探討,因此本研究針對零售商價格競爭行為進行研究。針對零售商之間的價格競爭行為,除了考量零售商與對手零售商的價格互動,不可忽略的是上游供應商的競爭互動與下游消費者的學習行為在市場中與零售商端互動下錯綜複雜的動態影響,緣此,本研究以零售商端的角度,想了解供應商競爭與消費者學習行為對零售商競爭的影響,再以單一零售商角度,分析各情況下所應對的價格調整策略。 本研究將零售商、供應商及消費者互動形成之競爭市場視為一個複雜適應性系統(Complex Adaptive System ,簡稱CAS),應用代理人基塑模與模擬(Agent-based Modeling and Simulation,簡稱ABMS)方式建構考量供應商競爭與消費者學習行為之零售商價格競爭模式,將演化賽局理論應用於價格競爭中,探討不同的消費者學習及供應商價格競爭行為如何動態影響零售商價格競爭型態,以及不同價格調整策略之績效表現。 研究結果發現一,市場中消費者呈現不同的學習行為,對零售商競爭將造成不同的衝擊。「貨比三家無學習」型消費者將造成零售商端低價競爭,使其平均價格最低及獲利最低。「自我式學習」型消費者將造成零售商高價合作,使其平均價格最高及獲利最高。「群體式學習」型消費者同樣使零售商端偏向高價合作,且其平均價格及獲利相當接近自我式學習市場,雖然兩種學習行為具有近似的平均價格與獲利,「群體式學習」卻會導致零售商價格競爭之型態轉為劇烈,包括獲利領先轉換方式由漸進轉為瀑布,領先方式從勢均力敵轉為大幅領先,領先互換的頻率由低轉為高。另外,消費者購買決策之理性程度對零售商端競爭形態有影響,不論在何種供應商行為下,高理性購買決策在群體式學習下將導致零售商端價格競爭較激烈,在自我式學習下卻導致零售商端競爭行為較緩和。 研究發現二,市場中供應商的價格競爭行為會對零售商端的價格、獲利與競爭型態造成衝擊。供應商呈現價格競爭行為下,在「貨比三家無學習」之消費者行為市場中,將減緩零售商價格競爭,使零售商端之平均價格及獲利提高。在「自我」與「群體式」學習消費者市場中,將增強零售商價格競爭強度,使零售商端之平均價格及獲利降低。 研究發現三,不同的競爭市場中,零售商之最佳價格調整策略也將不同。基本上在供應商無競爭行為下,無論消費者呈現何種行為,零售商採取開放式價格調整策略具有明顯優勢。在供應商呈現競爭行為下,開放式價格調整策略在「無學習」及「群體式學習高理性程度」行為市場仍為優勝策略,在「自我式學習」及「群體式學習低理性程度」下,保守型價格調整策略則表現較佳。 在實務意涵上,若零售商可使消費者行為偏向自我或群體式學習,並穩定供應商價格競爭下,整體而言零售商端競爭可獲得最高的獲利,若當此刻競爭零售商採取保守型價格策略,而本身採取開放式價格調整策略,則獲利最大。然而面臨群體式學習消費者,由於競爭強度的增加,需留意市場動態,須隨時靈活調整本身價格策略,避免因價格策略的僵化,而成為虧損之零售商。 / The pricing competitive model traditionally assumes that consumers will buy from the firm selling the homogeneous product at the lowest price, thus discarding any possibility of learning behavior on the demand side. But if, as in real competition, consumers learn adaptively and competition is a dynamic process, then some attention should be paid to consumers' behavior. In a multiple supplier – multiple retailer supply chain, multiple price competitive forces interact to influence firm price decisions. These forces include: (1) the supplier level competition each supplier faces from others producing the same product, (2) the retailer level competition among the retailers selling the same set of goods, and (3) the vertical interaction competition between the retailer and supplier. We are interest in these questions: How does the consumer learning behavior affect the retailer pricing competitive model? How does the competition of supplier affect the retailer pricing competitive model? What is the optimal adaptive pricing strategy for retailer performance in such competitive market including retailers, suppliers and consumers. Therefore, this research study a version of the pricing competitive (Bertrand) model in which consumer exhibit dynamic adaptive learning behavior when deciding from what retailers they will buy. And we consider to join the supplier competitive pricing behavior into the retailer pricing competitive model and formulate their interaction as evolutional game and to analyze the competition of supplier effect and its impact on the pricing competition of retailers. This research uses a complex adaptive system perspective to construct a retailer pricing competitive model which considers both competitive supplier and learning consumer behavior. Using agent-based modeling and simulation (ABMS) to construct the competitive market include retailers, suppliers and consumers, and use the fuzzy logic, genetic algorithms to model the pricing decision and learning behavior of retailers and suppliers, and use reinforcement learning and swarm algorithms to model consumers’ learning behavior. The simulation results demonstrate that: The retailer level obtains the highest profit when the consumer behavior following reinforcement learning. When the consumer behavior displays swarm learning, the retailer level also obtains high profit near the highest profit. However swarm learning increases the competitive intensity on the retailer level. The competitive supplier increases the competitive intensity and decrease profit on the retailer level when the consumer behavior displays reinforcement learning and swarm learning. The performance of retailer following a closed adaptive pricing strategy (high exploitation low exploration) exceeds that of retailer following an open adaptive pricing strategy (low exploitation high exploration) when the consumer behavior displays reinforcement learning and supplier display competitive behavior. However when the consumer behavior displays swarm learning and supplier display competitive behavior, the performance of retailer following an open adaptive pricing strategy exceeds that of retailer following a closed adaptive pricing strategy. The proposed pricing competitive model with adaptive learning of consumer behavior and competition of supplier can help retailers to analyze pricing strategy and further discovery and design the more optimal pricing strategy.

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