To guarantee the immediate and instant delivery of money transaction, it is essential to have a system that manages clients, agents and managers in one place. The objective of this project has been to study and develop an online remittance management system for a small business, that contains features to manage admins, agents, senders and beneficiarieswith different access level. The project user interface designed using bootstrap library and implemented on a popular PHP framework, Laravel. While the purpose of the project is to develop the system “Money Transfer Management System”, the evaluation process carried out based on user's privacy and security, functionality and usability test. The method used to solve the problem is the study and investigation of an initial set of requirement to identify the problem, application solution approach to divide the project into sub tasks, and application evaluation process to test and propose the result. On the other of technical side, object oriented programing technique in PHP, MySQL relational database, HTML5, CSS3 and JavaScript libraries used to solve the problem. The user of the system is able to create transactions with a unique reference id, pay out, cancel, edit and mange users data. The result of the study showed that, the system is secure against any injection or mass assignment attack.

Doctor of Philosophy / Department of Statistics / Haiyan Wang / Advances in technology easily collect a large amount of data in scientific research such as agricultural screening and micro-array experiments. We are particularly interested in data from one-way and crossed two-way designs that have a large number of treatment combinations but small replications with heteroscedastic variances. In this framework, several test statistics have been proposed in the literature. Even though the form of these proposed test statistics may be different, they all use limiting normal or chi-square distribution to conduct their tests. Such approximation approaches the true distribution very slowly when the sample size ni is small while the number of levels of treatments a gets large. A strategy to obtain better accuracy in the classical large sample size setting is to use the bootstrap procedure with studentized statistic. Unfortunately, the available bootstrap method fails when the number of treatment level combinations is large while the number of replications is small. The Fisher and Hall (1990) asymptotic pivotal statistic under large sample size setting is no longer pivotal under small sample size setting with large number of treatment levels. In the first part of this dissertation, we start with describing suitable bootstrap statistics and procedures for hypothesis tests in one- and two-way ANOVA with a large number of levels and small sample sizes. We prove that the theoretical type I error-rate of Akritas and Papadatos (2004) and Wang and Akritas (2006) test statistics and their corresponding bootstrap versions have accuracy of order O(1/√a). We then modify their statistics to obtain asymptotically pivotal statistics in our current framework. We prove that the theoretical type I error-rate of the bootstrap version of the pivotal statistics is accurate up to order O(1/√a). In the second part of the dissertation, we propose a new test statistic in one-way ANOVA which is asymptotically pivotal in the current setting. We improve the accuracy of approximation of the distribution of the test statistic by deriving asymptotic expansion of the statistic under the current framework and define a new test rejection region through Cornish-Fisher expansion of quantiles. The type I error-rate of the new test has a faster convergence rate and is accurate up to order O(1/a). Simulation studies show that our tests performs better in terms of type I error-rate but comparable power with that of Akritas and Papadatos (2004) in the large a small ni setting. The connection between our asymptotic expansions and bootstrap distribution in the large a small ni setting is discussed. Our proposed test based on asymptotic expansion and Cornish-Fisher expansion of quantiles have both the advantage of higher accuracy and computational efficiency due to no resampling is needed.

M.Sc. / In this study we consider the problem ofestiniating the slope in the simple linear errors-in-variables model. There are two different types of relationship that can he specified in the errors-in-variables model: one that specifies a functional linear relationship and one describing a structural linear relationship. The different relationship specifications can lead to different estimators with different properties. These two specifications are highlighted in this study. A least squares solution (to the estimation of the slope) is given. The problem of finding the maximum likelihood solution to these two specifications is addressed. It is noted that an unidentifiability problem arises in this attempt. The solution is seen to lie in making assumptions on the error variances. Interval estimation for the slope parameter is discussed. It is noted that any interval estimator of the slope whose length is always finite will have a confidence coefficient of zero. Various interval estimation methods are reviewed but emphasis is mainly on the investigation of a bootstrap procedure for estimating the confidence interval for the slope parameter β. More specifically, the Linder and Babu (1994) (bootstrap) method for the structural relationship model with known variance ratio is investigated here. The error distributions were assumed normal. A simulation study based on this paper is carried out. The results in the simulation study show that this bootstrap procedure performs well in comparison with the normal theory estimates for normally distributed data, that is, it has better coverage accuracy than the normal approximation.

This thesis is concerning the creation of individual information system for small house-keeping business. The goal is to obtain a system that would meet the needs of the company. The paper focuses on information system design and development in its own by using Java.

The purpose of this thesis is to propose some test statistics for testing the skewness and kurtosis parameters of a distribution, not limited to a normal distribution. Since a theoretical comparison is not possible, a simulation study has been conducted to compare the performance of the test statistics. We have compared both parametric methods (classical method with normality assumption) and non-parametric methods (bootstrap in Bias Corrected Standard Method, Efron’s Percentile Method, Hall’s Percentile Method and Bias Corrected Percentile Method). Our simulation results for testing the skewness parameter indicate that the power of the tests differs significantly across sample sizes, the choice of alternative hypotheses and methods we chose. For testing the kurtosis parameter, the simulation results suggested that the classical method performs well when the data are from both normal and beta distributions and bootstrap methods are useful for uniform distribution especially when the sample size is large.

The convex hull of a sample is used to approximate the support of the underlying distribution. This approximation has many practical implications in real life. For example, approximating the boundary of a finite set is used by many authors in environmental studies and medical research. To approximate the functionals of convex hulls, asymptotic theory plays a crucial role. Unfortunately, the asymptotic results are mostly very complicated. To address this complication, we suggest a consistent bootstrapping scheme for certain cases. Our resampling technique is used for both semi-parametric and non-parametric cases. Let X1,X2,...,Xn be a sequence of i.i.d. random points uniformly distributed on an unknown convex set. Our bootstrapping scheme relies on resampling uniformly from the convex hull of X1,X2,...,Xn. In this thesis, we study the asymptotic consistency of certain functionals of convex hulls. In particular, we apply our bootstrapping technique to the Hausdorff distance between the actual convex set and its estimator. We also provide a conjecture for the application of our bootstrapping scheme to Gaussian polytopes. Moreover, some other relevant consistency results for the regular bootstrap are developed.

Made available in DSpace on 2014-06-12T23:02:12Z (GMT). No. of bitstreams: 2 arquivo8414_1.pdf: 2160454 bytes, checksum: 170b0feee5ba26cb5fa4d84b48211385 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2004 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / O manejo pesqueiro, tradicionalmente, baseia-se em modelos de avaliação de estoque objetivando indicar recomendações para a explotação ótima de uma determinada espécie, sem que ocorra o colapso desta. Os modelos de avaliação de estoque requerem em seus cálculos dados biológicos da população provenientes dos parâmetros de crescimento e das taxas de mortalidade. As expressões matemáticas desses cálculos apresentam como premissas básicas suposições que metodologicamente ou biologicamente nem sempre são todas cumpridas, gerando vícios/erros nos resultados obtidos. Essas incertezas que envolvem a avaliação dos estoques pesqueiros podem dificultar a tomada de decisão acerca das capturas futuras. O manejo dos recursos pesqueiros, utilizando os métodos tradicionais, tem se mostrado ineficiente, acarretando no colapso de muitas pescarias. A partir da década de 70 e devido ao colapso das pescarias, a aplicação de outras estatísticas, como o método de bootstrap, tem possibilitado a investigação das incertezas das estimativas provenientes das estatísticas clássicas e rotineiramente utilizadas. Com o objetivo de investigar a exatidão das estimativas dos parâmetros biológicos de crescimento e taxas de mortalidade, da influência da freqüência reduzida de peixes jovens na amostra e da influência do acréscimo amostral de adultos e velhos no estoque explotado, foram realizadas reamostras, pelo método de bootstrap, para se estimar as incertezas destas estimativas e simular suas conseqüências nos modelos de avaliação de estoques. Para a aplicação desta metodologia foi tomado como estudo de caso a guaiúba Lutjanus chrysurus, capturada ao longo da costa nordestina, entre as profundidades de 47 a 400 m e amostrada pelo Programa Recursos Vivos da Zona Econômica Exclusiva (REVIZEE Score/NE), entre os anos de 1996 e 2000. Os dados de idade, obtidos por meio da leitura de 660 otólitos de L. chrysurus, foram utilizados para a elaboração de um conjunto de dados de idade e comprimento furcal. O método de bootstrap foi utilizado para gerar novos conjuntos de dados de idade e comprimento furcal, a partir da amostra original, sendo desenvolvido dois programas em linguagem C para realizar estas reamostras. O modelo utilizado para estimar os parâmetros de crescimento em comprimento foi a equação de von Bertalanffy; as taxas de mortalidade foram estimadas pelos métodos de Pauly, Ralston e Jensen; os modelos preditivos utilizados foram o Modelo de Rendimento por Recruta de Beverton & Holt e o Modelo de Biomassa por Recruta de Beverton & Holt; e, as incertezas das estimativas dos parâmetros de crescimento e das taxas de mortalidade foram analisadas por meio do intervalo de confiança do bootstrap padrão e do vício relativo. Os resultados do presente estudo indicaram que, dentre os parâmetros de crescimento, crescimento assintótico em comprimento (L∞), taxa de crescimento (k) e idade teórica da espécie com comprimento zero (t0), o k é o parâmetro estimado com maior variabilidade e que mais influencia a estimação da taxa de mortalidade natural (M); que os maiores vícios nas estimativas dos parâmetros de crescimento e mortalidade foram quando se simulou a redução dos jovens da amostra e o acréscimo dos adultos e velhos, sugerindo que a ausência de jovens nas amostras acarreta em sérios erros nas estimativas dos parâmetros de crescimento e das taxas de mortalidade; que a avaliação de estoques não deve ser somente baseada em modelos de biomassa por recruta, visto que os vícios relativos sempre foram maiores na biomassa do que no rendimento relativo por recruta; e, que a técnica de reamostragem deve ser considerada como uma ferramenta rotineira e essencial nas estimativas dos parâmetros de crescimento, taxas de mortalidade e na avaliação de estoques, já que o melhor rendimento relativo por recruta e biomassa relativa por recruta foi proveniente da análise das incertezas. Baseado nos dados obtidos sugere-se a redução da taxa de mortalidade por pesca de L. chrysurus a fim de evitar o colapso desta espécie

Spelplanen för energiproducenter kommer inom de kommande årtionden förändras och företagen kommer ställas inför stora utmaningar. Kärnkraften kommer att fasas bort till 2040 enligt ett Regeringsbeslut, något som kommer kräva en utbyggnad av de förnyelsebara energikällorna som vind- och solkraft. Det är energikällor som har betydligt större variation där väder påverkar produktionen samtidigt som det är svårt att planera och prognostisera. Det kan således tillkomma och falla bort elproduktion på nätet under kort tid om det som exempel skulle sluta blåsa under en timme. Ett fungerande elsystem bygger på att det alltid ska finnas en balans mellan elproduktion och elanvändning. Denna balans mäts i frekvens på elnätet och Norden har en nominell frekvens på 50,0Hz, något som påverkas av ett underskott eller överskott av antingen produktion eller konsumtion. En utbyggnad i vind- och solkraft kan således ställa högre krav på vattenkraften som med sin goda planeringsförmåga fungerar utmärkt som frekvensreglerande kraftkälla. Inom vattenkraftsproduktion finns det två produktkategorier som energiproducenter kan sälja sin producerade el som normal drift och frekvensreglering, där den förstnämna är den som majoriteten av intäkterna står för. Eftersom det finns stora kostnader relaterade till slitage som uppstår i en turbin vid drift är det i Skellefteå Krafts intresse att studera de kostnader som är orsakade av frekvensreglering. För detta har olika utjämningsfunktioner utnyttjats för att klassificera data som antingen normal drift eller frekvensreglering, för att sedan beräkna vad frekvensregleringen motsvarar i slitage på ett aggregat. Skellefteå Kraft har i Augusti 2019 implementerat ett system som lagrar driftdata. Då en förväntad livslängd av en kaplanturbin är mellan 40 och 50 år krävdes det då mer data för att kunna dra rimliga slutsatser. Eftersom en begränsning finns gällande mängden av data, används omsamplinstekniken Block bootstrap för simulering av driftdata, vilket är nödvändigt för att kunna utföra en livslängdsanalys. Slutsatsen var att trots att frekvensreglering stod för drygt 95% av slitaget stod det endast för 8-9% av intäkterna, men att det ändå hade en vinstmarginal på 2-3 gånger kostnaden. En livslängdssimulering på 40 år medförde ett slitage på drygt 420 mikrometer för det Yttre löpskoveltappslagret (det lager som slits mest), vilket ligger inom rimligt slitage med hänsyn till designvärdet.

京都大学 / 新制・課程博士 / 博士(理学) / 甲第22996号 / 理博第4673号 / 新制||理||1670(附属図書館) / 京都大学大学院理学研究科物理学・宇宙物理学専攻 / (主査)教授 高柳 匡, 教授 杉本 茂樹, 教授 田中 貴浩 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DFAM

This diploma thesis deals with the creating of a web apllication using the Nette framework for the KradenaKola.cz project. Theoretical background is utilized to describe the technologies used in development. Based on analysis of the request, the entire web application is created both functionally and visually.