The problem of computing K shortest loopless paths, or ranking of the K shortest loopless paths between a pair of given vertices in a network is a well-studied generalization of shortest path problem. The K shortest paths problem determines not only one shortest path but the K best shortest paths from s to t in an increasing order of weight of the paths. Yen’s algorithm is known to be the efficient and widely used algorithm for determining K shortest loopless paths. Here, we introduce a new algorithm by modifying the Yen’s algorithm in the following way: instead of removing the vertices and the edges from the graph, we store them in two different sets. Then we modified the Dijkstra’s algorithm by taking these two sets into consideration. Thus the algorithm applies glass box methodology by using the modified Dijkstra’s algorithm for our dedicated purpose. Thus the efficiency is improved. The computational results conducted over different datasets, shows the proposed algorithm has better performance results.

Syfte: Syftet med denna studie var att se hur och varför volatiliteten påverkades i DJIA, S&P 500 och NASDAQ Composite under IT-bubblan. Metod: Års- och månadsvolatiliteten för DJIA, S&P 500 och NASDAQ Composite har beräknats under 1995-2004 med hjälp av data från Yahoo Finance. Empiri: Resultatet visar att volatiliteten var väsentligt högre i NASDAQ Composite än vad den var i S&P 500 och DJIA som i sin tur höll en liknande volatilitet i förhållande till varandra. Analys: I analysen framträdde det att volatiliteten blev väsentligt högre i samband med att bubblan sprack under maj 2000 fram till dess att paniken lade sig kort efter maj 2002. Det fanns en hög överensstämmelse mellan denna rapport och övriga tidigare studier. Teorierna var mestadels väl applicerbara. Slutsats: Volatiliteten för DJIA, S&P 500 och NASDAQ Composite var som högst mellan 2000 och 2002 under undersökningsperioden 1995-2004. IT-bubblan uppstod samt sprack till följd av irrationellt investeringsbeteende bland investerarna på aktiemarknaden och paniken som uppstod efteråt gjorde att volatiliteten på aktiemarknaden höll sig förhållandevis hög fram tills den lade sig kort efter maj 2002. NASDAQ Composite hade högst volatilitet till följd av IT-bubblan medan DJIA och S&P 500 hade likvärdig volatilitet. Samtliga index följde ett liknande mönster, detta var troligtvis på grund av att företag från NASDAQ Composite kunde återfinnas i S&P 500 samt DJIA. / Purpose: The purpose of this thesis is to see how and why the volatility was affected in DJIA, S&P 500 and NASDAQ Composite during the Dot-com bubble. Method: The yearly and monthly volatility of DJIA, S&P 500 and NASDAQ Composite were computed with data from a period spanning 1995-2004, which were collected from Yahoo Finance. Empiricism: The results illustrate that the volatility was vastly higher in NASDAQ Composite than in DJIA and S&P 500 which in turn yielded a comparable volatility in relation to each other. Analysis: The analysis extracted the fact that the volatility rose considerably after the bubble burst during May 2000 and started waning after the panic died out circa May 2002. There were a relatively high harmony between the results of this report and the earlier studies which it was compared to. Conclusion: The volatility for DJIA, S&P 500 and NASDAQ 500 was higher between 200 and 2002 than during the rest of the observed period. The Dot-com bubble arose due to irrational investment behavior among investors and the panic which arose afterwards contributed to the increasing volatility which maintained a high level until it subsided after May 2002. NASDAQ Composite had the highest volatility during the Dot-com bubble while DJIA and S&P 500 had a similar volatility. All indexes followed a similar pattern, this was probably due to that companies from NASDAQ Composite reasonably should be found in S&P 500 and DJIA.

This thesis presents a novel approach for a power system to find a practical power flow solution when all the generators in the system have hit their real power output limits, such as some generator units shutting down or load outages. The approach assumes the frequency of the system is unable to be kept at the rated value (usually 60 or 50 Hz) and accordingly, the generator real power outputs are affected by the system frequency deviation. The modification aims to include the system frequency deviation as a new state variable in the power flow so that the power system can be described in a more precise way when the generation limits are hit and the whole system is not operated under the normal condition. A new mathematical formulation for power flow is given by modified the conventional power flow mismatch equation and Jacobian matrix. The Newton – Raphson method is particularly chose to be modified because Newton – Raphson method is most widely used and it is a fast convergent and accurate method. The Jacobian matrix will be augmented by adding a column and a row. Matlab is used as a programming tool to implement the Power Flow for Long Term Frequency Stability (PFLTFS) method for a simple 4-bus system and the IEEE 118-bus system. And PSS/E Dynamic simulation is used to verify the steady state solution from PFLTFS is reasonable. The PSS/E Dynamic Simulation plots are used to analyze the long term frequency response. The PFLTFS method provides a technique for solving an abnormal state system power flow. From the results we can conclude that the PFLTFS method is reasonable for solving power flow of a real power unbalanced system.

Thesis (M.A.)--Carleton University, 2004. / Includes bibliographical references (p. 104). Also available in electronic format on the Internet.

Communication problems may happen by a phonological deviation present in the speech of some children during the sounds acquisition and it may cause a limited phonetic inventory besides a simplified phonological system that will lead to a decrease in intelligibility. This study aimed at determining the correlation between intelligibility and the phonological deviation severity since the analysis of three different groups of judges. The research consisted of two samples; one sample to be assessed (subjects with phonological deviation) and another sample that comprised the judges (speech therapists, laypeople and mothers). The first sample was composed of 30 subjects, 10 female (33,3%) and 20 male (66,7%), average age 4:1 to 7:11, who presented phonological deviation determined by speech therapy, phonological tests and complementary assessments developed in the Program of Speech Therapy Assistance at UFSM. The second sample comprised the judges and it was consisted of five laypeople, five subjects with a background in the field (speech therapists and seniors from the Language Therapy graduation course at UFSM) and five subjects selected from the children s families (mothers). The speech of the subjects presenting phonological deviation was transcribed, analyzed and classified after nominalization, imitation and spontaneous speech tests. Then, it was determined the phonological deviation severity according to the Percentage of Correct Consonants (PCC) proposed by Shriberg & Kwiatkowski (1982). It was also carried out a narrative test through which it was obtained a sample of spontaneous speech that was analyzed by the judges. The pieces of narrative were drawn to be presented to the judges randomly, ranging from Speech 1 to Speech 90, accompanied by some questions of identification and description of the judges, together with a chart for the registration of intelligibility and levels of severity. Following it, it was carried out the mode of 90 pieces of narrative, which helped in the statistical analysis of the data based on Concordance Analysis by Kappa and Spearman s Correlation, using the statistics program STATA. It was verified speech intelligibility and the phonological deviation severity assessed by the group of judges, as well as the concordance between these variables. Finally, it was examined the correlation between the severity index according to PCC and the values presented by each group of judges. Regarding intelligibility, it was widely classified as regular by all groups, and it was noticed that the speech therapists were more tolerant in their assessment. It was observed that the group of speech therapists and mothers used more the category average in their assessment of severity while the laypeople group used more the category moderate-severe . There was more concordance among the groups of judges concerning the extremes in the judgment of intelligibility (good and insufficient) and also of severity (average and severe). Considering the comparison among the results by the groups of judges; mothers and laypeople presented almost the same evaluation to intelligibility, and the level of concordance was higher to intelligibility evaluated as good. In terms of severity, the similarities among the groups were stronger in the extremes (average and severe); whereas among speech therapists and mothers it was almost perfect to average and severe levels. The concordance among all the groups was substantial to the assessment of good intelligibility as well as of average and severe levels of phonological deviation severity, being more difficult the judgment and classification of mild-moderate and moderate-severe severity as well as regular intelligibility. It was found a higher correlation between the severity and the severity in PCC by speech therapists and mothers, showing that laypeople face more difficulties in presenting a precise assessment of the phonological deviation severity. The correlations between the intelligibility of the speech and the phonological deviation severity by all the groups were positive and similar to the real indexes for all the groups of judges. Therefore, it was easy to the judges analyzing and correlating the assessments according to intelligibility and severity in the narratives of the subjects. It was observed that the more unintelligible the speech was, the more severe was its classification by the groups of judges. / Problemas na comunicação podem ser ocasionados pelo desvio fonológico, presente na fala de algumas crianças em fase de aquisição dos sons. Isso poderá ocasionar um inventário fonético restrito além de um sistema fonológico simplificado o que levará a diminuição da inteligibilidade. Este estudo teve como objetivo determinar a correlação entre a inteligibilidade e a gravidade do desvio fonológico a partir da análise de três grupos de julgadores. A pesquisa foi composta de duas amostras, uma amostra a ser julgada (sujeitos com desvio fonológico) e outra julgadora (fonoaudiólogas, leigas e mães). Os 30 sujeitos julgados, 10 (33,3%) do sexo feminino e 20 (66,7%) do masculino, com idade entre 4:1 e 7:11, possuíam o diagnóstico de desvio fonológico, determinado pelas avaliações fonoaudiológica, fonológica e complementares, e foram triadas no Serviço de Atendimento Fonoaudiológico (SAF) da UFSM. A amostra julgadora constituiu-se de cinco sujeitos leigos, cinco sujeitos com formação (fonoaudiólogas e formandas do curso de Fonoaudiologia da UFSM) e cinco sujeitos de convívio (mães das crianças participantes da amostra julgada). A fala dos sujeitos com desvio fonológico foi transcrita, analisada e classificada após as provas de nomeação, imitação e fala espontânea. Após, determinou-se a gravidade do desvio fonológico a partir do Percentual de Consoantes Corretas (PCC) proposto por Shriberg & Kwiatkowski (1982). Uma prova narrativa também foi aplicada, pela qual se obteve uma amostra da fala espontânea que pôde ser analisada pelos julgadores. As narrativas foram sorteadas para apresentação em ordem aleatória aos julgadores na ordem da Fala 1 a Fala 90, e eram acompanhadas do questionário com perguntas de identificação e caracterização dos julgadores além das grades para marcação da inteligibilidade e gravidade. A partir daí, realizou-se a Moda das 90 narrativas, a qual possibilitou a análise estatística dos dados através da Análise de Concordância Kappa e da Correlação de Spearman, utilizando o programa estatístico STATA. Verificou-se a inteligibilidade da fala e a gravidade do desvio fonológico julgada pelos grupos de juízes e a concordância entre essas variáveis nos julgamentos. Finalizando, verificou-se a correlação entre o índice da gravidade do desvio fonológico a partir do PCC e os valores julgados por cada um dos grupos de juízes. Quanto à inteligibilidade da fala dos sujeitos julgados o conceito regular foi o mais utilizado por todos os grupos em seus julgamentos, e os fonoaudiólogos foram mais tolerantes em seus julgamentos. Observou-se que o grupo de fonoaudiólogas e mães utilizou mais o conceito médio em seus julgamentos para a gravidade do desvio fonológico e o grupo de leigas fez maior uso do grau moderado-severo. Houve maior concordância entre os grupos de juízes para os extremos das possibilidades de julgamento da inteligibilidade (boa e insuficiente) e também da gravidade (médio e severo). Quanto à concordância entre os grupos, as julgadoras mães e leigas tiveram concordância quase perfeita para o julgamento da inteligibilidade boa e o grau de concordância foi mais acentuado para a inteligibilidade julgada como boa. Para a gravidade do desvio fonológico, a concordância entre os grupos foi mais acentuada nos extremos (médio e severo), sendo que entre as julgadoras fonoaudiólogas e mães essa concordância foi quase perfeita para o grau médio e severo. A concordância entre todos os grupos de julgadores foi substancial para os julgamentos da inteligibilidade boa e da gravidade média e severa, sendo mais difícil o julgamento e classificação da gravidade médio-moderado e moderado-severo e da inteligibilidade regular. Notou-se uma maior correlação entre a gravidade julgada e a gravidade em PCC no grupo de julgadores fonoaudiólogas e no das mães, demonstrando que o grupo das leigas possui maior dificuldade em julgar com precisão a gravidade do desvio fonológico. As correlações entre a inteligibilidade da fala e a gravidade do desvio fonológico foram positivas e próximas da perfeita para todos os grupos de julgadores. Portanto, houve facilidade para os julgadores analisarem e correlacionarem os julgamentos quanto à inteligibilidade da fala e à gravidade do desvio fonológico das narrativas dos sujeitos. Observou-se que quanto mais foi julgada ininteligível a fala, mais severa foi a sua classificação pelos grupos de julgadores participantes.

Made available in DSpace on 2014-06-11T19:28:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-08Bitstream added on 2014-06-13T18:57:58Z : No. of bitstreams: 1 carvalho_as_me_guara.pdf: 714165 bytes, checksum: a9b78d56635122098c45b1b30722ec8f (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Universidade Estadual Paulista (UNESP) / Abrir e fechar a boca é um dos movimentos biomecânicos mais importantes do ser humano, sendo um dos primeiros a ser realizado antes mesmo do nascimento. Ela é responsável pela deglutição, mastigação, respiração e a fala. Este movimento é realizado por um conjunto articular-músculo-esquelético, chamado sistema estomatognático, no qual destaca a mais complexa articulação do corpo humano, denominada de articulação temporomandibular (ATM). Sua disfunção acarreta uma série de problemas sempre acompanhada de dores, no qual grande parte da população mundial apresenta distúrbios neste sistema, necessitando a busca de tratamento. Apesar de estudos já realizados, torna-se ainda imprescindível uma abordagem específica do tema, no qual a ausência de parâmetros existentes, e mundialmente aceitos, para avaliações e diagnósticos, comprometem os objetivos do tratamento, que atualmente depende mais da experiência do terapeuta do que de evidências científicas. Desta forma este trabalho contribui para obtenções de conhecimentos, esclarecimentos e cuidados com pacientes que sofrem de Disfunção Temporo Mandibular (DTM), com o seu principal objetivo, a construção de um equipamento capaz de mensurar e diagnosticar anormalidades durante o movimento biomecânico da abertura e fechamento da boca, através de um sistema de captação de imagens. Utiliza-se de equipamentos de baixo custo e de fácil manuseio, comparado a sistemas disponíveis hoje no mercado. As imagens obtidas são processadas por um software específico para este fim, onde os dados são tratados e modelados, fornecendo o movimento no plano frontal e lateral da mandíbula, analisando sua respectiva trajetória no movimento de lateralidade, protrusão e amplitude máxima da abertura e fechamento da boca, fornecendo dados milimetricamente mensurados.... / To open and to close the mouth are one of the more important biomechanics movements of the human being, being one of first to be carried through before the same one of the birth. It is responsible for the deglutition, chew, breath and he says it. This movement is carried through by a joint articulate-muscle-bone, call masticate system, in which detaches the most complex joint of the called human body of Joint Temporo Mandible (JTM). Its disturb causes a series of problems always followed of pains, needing the treatment search. Although some carried through studies already, a specific boarding of the subject still becomes essential, in which the absence of existing parameters, and world-wide accepted, and diagnostic, compromises the objectives of the treatment, that currently depends more on the experience of the therapist on whom of scientific evidences. Of this form this work search the attainment of knowledge, clarifications and cares with the patients who suffer DTM, having as objective to construct an equipment capable to measure and to diagnosis abnormalities during the biomechanics movement of the opening of the mouth, through a system of capitation of images. One today used of equipment of low cost, compared the available systems in the market, generating images that will be processed for a software, developed specifically for this work, for the treatment and modeling of the data of the movement in the front plain of the jaw, analyzed its respective trajectory, in the movement of lateral, supplying given measure ...(Complete abstract, click electronic address below).

abstract: Concerns about Peak Oil, political instability in the Middle East, health hazards, and greenhouse gas emissions of fossil fuels have stimulated interests in alternative fuels such as biofuels, natural gas, electricity, and hydrogen. Alternative fuels are expected to play an important role in a transition to a sustainable transportation system. One of the major barriers to the success of alternative-fuel vehicles (AFV) is the lack of infrastructure for producing, distributing, and delivering alternative fuels. Efficient methods that locate alternative-fuel refueling stations are essential in accelerating the advent of a new energy economy. The objectives of this research are to develop a location model and a Spatial Decision Support System (SDSS) that aims to support the decision of developing initial alternative-fuel stations. The main focus of this research is the development of a location model for siting alt-fuel refueling stations considering not only the limited driving range of AFVs but also the necessary deviations that drivers are likely to make from their shortest paths in order to refuel their AFVs when the refueling station network is sparse. To add reality and applicability of the model, the research is extended to include the development of efficient heuristic algorithms, the development of a method to incorporate AFV demand estimates into OD flow volumes, and the development of a prototype SDSS. The model and methods are tested on real-world road network data from state of Florida. The Deviation-Flow Refueling Location Model (DFRLM) locates facilities to maximize the total flows refueled on deviation paths. The flow volume is assumed to be decreasing as the deviation increases. Test results indicate that the specification of the maximum allowable deviation and specific deviation penalty functional form do have a measurable effect on the optimal locations of facilities and objective function values as well. The heuristics (greedy-adding and greedy-adding with substitution) developed here have been identified efficient in solving the DFRLM while AFV demand has a minor effect on the optimal facility locations. The prototype SDSS identifies strategic station locations by providing flexibility in combining various AFV demand scenarios. This research contributes to the literature by enhancing flow-based location models for locating alternative-fuel stations in four dimensions: (1) drivers' deviations from their shortest paths, (2) efficient solution approaches for the deviation problem, (3) incorporation of geographically uneven alt-fuel vehicle demand estimates into path-based origin-destination flow data, and (4) integration into an SDSS to help decision makers by providing solutions and insights into developing alt-fuel stations. / Dissertation/Thesis / Ph.D. Geography 2010

Comparações da dinâmica ovariana entre mais de duas raças equinas, sob condições padronizadas, não são encontradas na literatura. Objetivando comparar a dinâmica folicular e luteal, foram realizados exames diários de ultrassonografia durante um intervalo interovulatório contemporâneo, em éguas de pequeno porte (grupo Mini Pony – MP; n=10), médio porte (grupo Large Pony – LP; n=9) e grande porte (grupo Brasileiro de Hipismo – BH; n=12). Concluiu-se que os três grupos diferiram quanto ao máximo diâmetro do folículo pré-ovulatório (FPO) (mm) (MP=36,15; LP=40,95; BH=46,66), diâmetro do FPO um dia antes da ovulação (mm) (MP=35,8; LP=40,55; BH=46,48) e crescimento diário médio do FPO (mm/dia) (MP=2,6; LP=3,05; BH=3,51). O grupo MP diferiu dos demais quanto ao número de folículos por onda ovulatória (MP=4,8; LP=10,11; BH=9,75), número de folículos por dia (MP=4,19; LP=10,27; BH=10,63), número de folículos maiores ou iguais a 10mm (MP=2,98; LP=5,88; BH=5,98), diâmetro do FPO à divergência (mm) (MP=22,62; LP=24,81; BH=25,58), diâmetro do segundo maior folículo à divergência (SMF) (mm) (MP=15,56; LP=21,25; BH=21,83), diferença de diâmetro entre FPO e SMF à divergência (mm) (MP=7,25; LP=3,56; BH=3,75) e área do corpo lúteo (CL) (mm2) (MP=436,1; LP=674,4; BH=720,4). Não houve diferença entre os grupos quanto à duração do ciclo (dias) (MP=21,9; LP=20,22; BH=20,58), ocorrência de divergência (MP=80%; LP=88,89%; BH=100%), dias decorridos entre a emergência do FPO e SMF (MP=0,8; LP=0,89; BH=0,92) e diferença de diâmetro entre estes na emergência (mm) (MP=0,4; LP=0,44; BH=0,5) e na divergência (mm) (MP=7,25; LP=3,56; BH=3,75); dias entre emergência e divergência (MP=5,12; LP=5,5; BH=5,5) e divergência e ovulação (MP=7,12; LP=6,62; BH=6,8), número de ondas menores (MP=0,3; LP=0,33; BH=0,42) e duração do CL (dias) (MP=12,4; LP=14,67; BH=13,92). / Comparisons of ovarian dynamics between more than two equine breeds, under standardized conditions, are not found in the literature. The objective of this study was to compare follicular and luteal dynamics during one contemporary intervulatory interval by daily ultrasonography examinations in small size mares (Mini Pony group - MP; n=10), medium size (Large Pony group - LP; n=9) and large size (Brazilian Warmblood group - BH; n=12). It was concluded that all three groups differed regarding maximum diameter of the preovulatory follicle (POF) (mm) (MP=36.15; LP=40.95; BH=46.66), maximum diameter of POF one day before ovulation (mm) (MP=35.8; LP=40.55; BH=46.48) and the mean daily growth of POF (mm / day) (MP=2.6; LP=3.05; BH=3.51). The MP group differed from LP and BH groups regarding number of follicles per ovulatory wave (MP=4.8; LP=10.11; BH=9.75), number of follicles per day (MP=4.19; LP=10, 27; BH=10.63), number of follicles equal or greater than 10mm (MP=2.98; LP=5.88; BH=5.98), diameter of POF at deviation (mm) (MP=22.62; LP=24.81; BH=25.58), diameter of second largest follicle (SLF) at deviation (MP=15.56; LP=21.25; BH=21.83), diameter difference between FPO and SLF at deviation (mm) (MP=7.25; LP=3.56; BH=3.75), corpus luteum (CL) area (mm2) (MP=436.1; LP=674.4; BH=720.4). There was no difference between groups regarding cycle length (MP=21.9; LP=20.22; BH=20.58), occurrence of deviation (MP=80%; LP=88.89%; BH=100%), days between emergence of POF and SLF (MP=0.8, LP = 0.89, BH = 0.92), and diameter difference between POF and SLF at emergence (mm) (MP=0.4; LP=0.44; BH=0.5) and at deviation (mm) (MP=7.25; LP=3.56; BH=3.75); days between emergence and deviation (MP=5.12; LP=5.5; BH=5.5), deviation and ovulation (MP=5.12; LP=6.62; BH=6.8), number of minor waves (MP = 0.3; LP = 0.33; BH = 0.42) and CL lifespan (days) (MP=12.4; LP=14.67; BH=13.92).

Situações nas quais a compensação financeira pode ser eficaz na recuperação da confiança após o duplo desvio têm sido negligenciadas pela literatura de marketing. O objetivo principal desta dissertação foi identificar situações em que a compensação financeira imediata é mais eficaz do que táticas de recuperação não financeiras (i.e. pedido de desculpas, promessa de não ocorrência de mesma falha no futuro) na restauração da confiança após o duplo desvio. Especificamente, visou examinar a moderação do tipo de violação (se financeira ou não) no efeito de diferentes táticas de recuperação (i.e. pedido de desculpas, promessa de não ocorrência de mesma falha no futuro e compensação financeira) sobre a recuperação da confiança após o duplo desvio; e investigar a mediação das atribuições no efeito da compensação financeira sobre a recuperação da confiança após o duplo desvio. Os resultados encontrados através de dois estudos experimentais realizados com diferentes populações e contextos de serviços indicam que a compensação imediata é mais eficaz do que o pedido de desculpas e a promessa na recuperação da confiança após o desvio duplo somente quando a falha inicial implicou em perda financeira para o cliente. Quando a falha inicial não gera perdas monetárias, todas as três táticas possuem efeitos similares. Além disso, verificou-se que a atribuição de benevolência explica ao menos parte do efeito da compensação monetária sobre a recuperação da confiança na situação de falha monetária. / Situations in which financial compensation may be effective to rebuild trust after a double deviation have been neglected by the marketing literature. The main objective of this thesis was to identify situations in which immediate financial compensation is more effective than non-financial recovery tactics (i.e., apology, promise that the failure will not repeat in the future) in trust restoration after double deviation. It specially aimed to examine the moderation of the type of failure (whether financial or not) in the effect of different recovery tactics (ie apology, promise, and financial compensation) on trust recovery after double deviation; and investigate the mediation of attributions in the effect of financial compensation on trust recovering after the double deviation. The results found, through two experimental studies conducted with different populations and service contexts, indicate that immediate compensation is more effective than apology and promise to repair trust after double deviation only when the initial failure causes a financial loss for the client. When the initial failure does not refer to monetary losses, all three tactics had similar effects. In addition, it has been found that the attribution of benevolence explains at least part of the effect of monetary compensation on trust recovery in the situation of monetary failure.

Nesta dissertação estudamos uma probabilidade obtida a partir de conceitos da Mecânica Estatística Quântica do ponto de vista da Teoria Ergódica. A probabilidade é obtida a partir de um estado KMS sobre um lattice unidimensional de spins quânticos. Mostramos que esta probabilidade é mixing para o shift. Além disso, mostramos que vale um princípio dos grandes desvios para uma certa classe de funções e exploramos algumas propriedades do Jacobiano. Iremos considerar o estado KMS associado a um certo Hamiltoniano específico agindo sobre o lattice de spins quânticos. Nas seções iniciais vamos apresentar alguns conceitos e prerequisitos básicos (como operadores densidade, produto tensorial, C*-algebras e estados KMS) para o entendimento do resultado principal / In this dissertation we study a probability derived from Quantum Statistical Mechanics through the viewpoint of Ergodic Theory. The probability is obtained from a KMS state acting on a one dimensional lattice of quantum spins. We show that this probability is mixing for the shift map. Moreover, we show that a large deviation principle is true for a certain class of functions and we explore some properties of the Jacobian. We will consider the KMS state associated to a certain specific Hamiltonian acting on the quantum spin lattice. In the initial sections we will present some concepts and prerequisites (such as density operators, tensor product, C*-algebras and KMS states) for the understanding of our main results.