This dissertation considers radar detection and tracking of weak fluctuating targets using dynamic programming (DP) based track-before-detect (TBD). TBD combines target detection and tracking by integrating data over consecutive scans before making a decision on the presence of a target. A novel algorithm is proposed which employs order statistics in dynamic programming based TBD (OS-DP-TBD) to detect weak fluctuating targets. The well-known Swerling type 0, 1 and 3 targets are considered with non-Gaussian distributed clutter and complex Gaussian noise. The clutter is modeled using the Weibull, K and G0 distributions. The proposed algorithm is shown to provide better performance than well-known techniques in the literature. In addition, a novel expanding window multiframe (EW-TBD) technique is presented to improve the detection performance with reasonable computational complexity compared to batch processing. It is shown that EW-TBD has lower complexity than existing multiframe processing techniques. Simulation results are presented which confirm the superiority of the proposed expanding window technique in detecting targets even when they are not present in every scan in the window. Further, the throughput of the proposed technique is higher than with batch processing. Depending on the range and azimuth resolution of the radar system, the target may appear as a point in some radar systems and there will be target energy spillover in other systems. This dissertation considers both extended targets with different energy spillover levels and point targets. Simulation results are presented which confirm the superiority of the proposed algorithm in both cases. / Graduate

Orientador: Robinson Antonio Pitelli / Banca: Núbia Maria Correia / Banca: Dagoberto Martins / Resumo: Um dos mais importantes fatores que afetam negativamente o crescimento, produtividade e qualidade do produto da soja é a interferência proporcionada pelas plantas daninhas. Assim, este trabalho foi conduzido com o objetivo de estudar a evolução fitossociológica da comunidade infestante crescendo em convivência com a cultura da soja por diferentes períodos, a determinação do PAI e estudar a dominância relativa dos macronutrientes por parte das plantas daninhas e da soja para as condições experimentais. O experimento foi instalado sobre Latossolo Vermelho eutrófico típico de textura argilosa, no delineamento experimental em blocos ao acaso com doze repetições e, como tratamentos, foram avaliados os períodos de convivência desde a emergência da soja até 0, 7, 14, 21, 28, 35, 42, 56, 70 dias do ciclo e até a colheita. A cultivar da soja foi a M-SOY 8045RR, o espaçamento de 0,45 m entre linhas e uma população de 400.000 plantas/ha. Os resultados refletiram as relações competitivas entre a cultura da soja e uma comunidade infestante em que Acanthospermum hispidum foi a população de maior importância relativa devido sua predominância numérica e na massa seca acumulada e que apresentou equilíbrio na diversidade e equitabilidade durante todo o ciclo, embora ocorresse dois grupos distintos de similaridade na evolução desta vegetação. O primeiro grupo englobou as avaliações realizadas até os 21 dias e foi caracterizado por um relativo equilíbrio numérico entre as principais populações. O segundo grupo de similaridade foi caracterizado pela ampla predominância da população de A. hispidum. A dominância relativa da soja quando comparado com a soma de todas as plantas daninhas para massa seca, nitrogênio, fósforo, cálcio e magnésio apresentou um decréscimo dos valores da soja até 35 - 42 dias e, depois a... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The weed interference is one the major factors affecting the growth, productivity a soybean grain quality. So, this research was carried out aiming to evaluate the effects of crescent weed periods, since the soybean emergence, on soybean productivity, estimate the PAI value and study the dominance of nutrients from weeds and soybean for the experimental conditions. The experiment was conducted on "Latossolo Vermelho eutrófico típico de textura argilosa" soil, and arranged in a completely randomized blocks experimental design with twelve replications. The treatments consisted in different weedy periods beginning in the soybean emergence until 0, 7, 14, 21, 28, 35, 42, 56, 70 days and until the crop harvesting. The soybean cv. "M-SOY 8045RR", was sowed in row spacing of 0.45m and reaching a population of 400.000 plants/ha. The weed community had the Acanthospermum hispidum as the major relative importance population, due to it numeric and biomass relevance. The community showed the similar values of diversity and equitability index through out the soybean cycle, although there was two similarity groups in the weed community evolution. The first group was composed by evaluations realized until 21 days and was characterized by the relative equilibrium involving the main populations. The second group had a clear predominance of Acanthospermum hispidum population and involved the evaluations realized at 28, 35, 42, 56, 70 days and at the soybean harvesting. The soybean dry mass, nitrogen, phosphorus, calcium and magnesium relative dominance was reduced until 35 - 42 days comparing to weeds. Afterwards, the crop increased those relative dominances, keeping high predominance on nutrients uptake. The sulfur relative dominance was highly predominant in soybean comparing to weeds, but it was intensively decreased between seven and 28 days, increasing it... (Complete abstract, click electronic access below) / Mestre

O preparo de misturas de areia-asfalto a frio com emulsão asfáltica possui algumas características que dificultam a avaliação de seu desempenho através de ensaios de laboratório. Estas características são atribuídas à emulsão asfáltica que necessita de cuidados adicionais em relação a outros tipos de ligantes betuminosos. Um desses cuidados é o procedimento de cura antes da compactação para favorecer a perda de umidade das misturas. Neste trabalho é avaliada a influência da perda de umidade de três tipos de misturas de areia-asfalto a frio - misturas sem filler, com filler de pedregulho britado e com filler de cimento Portland, sobre os resultados de alguns ensaios de laboratório. Os ensaios usados para esta avaliação foram: dosagens sem cura e com cura antes da compactação das misturas; controle da perda de umidade; ensaios Marshall com variação da perda de umidade e fluência por compressão uniaxial estática. A perda de umidade antes da compactação das misturas mostrou-se um importante fator de influência nos resultados do ensaio Marshall. Porém, o ensaio de fluência por compressão uniaxial estática revelou que mesmo as misturas com melhor desempenho no ensaio Marshall são muito suscetíveis à deformação permanente e com ruptura frágil mesmo sob a ação de tensões axiais relativamente baixas. / The preparation of cold sand-asphalt mixtures with asphalt emulsion has some characteristics that can affect the laboratory evaluation of its performance. These characteristics are attributed to asphaltic emulsion that needs additional cares in relation to others types of bituminous binders. One of these cares is the curing procedure before compaction, to favor moisture loss. In this work the influence of moisture loss on the results of some laboratory tests is evaluated for three cold sand-asphalt mixtures - mixtures without filler, with crushed gravel filler and with portland cement filler. The tests used for this evaluation are: optimum asphalt content with and without curing before the mixtures compaction, moisture loss control, Marshall tests with moisture loss variation and static creep test. Moisture loss before compaction showed to have a clear influence on the results of Marshall tests. However the static creep test revealed that even those mixtures with the best Marshall test performances are very susceptible to permanent deformation and fragile rupture under low axial stress.

Submitted by Filipe dos Santos (fsantos@pucsp.br) on 2017-01-10T11:25:34Z No. of bitstreams: 1 Luís Gustavo Dias da Silva.pdf: 1501183 bytes, checksum: 2883c961e0b6a77584c644b46852d8c4 (MD5) / Made available in DSpace on 2017-01-10T11:25:34Z (GMT). No. of bitstreams: 1 Luís Gustavo Dias da Silva.pdf: 1501183 bytes, checksum: 2883c961e0b6a77584c644b46852d8c4 (MD5) Previous issue date: 2016-12-08 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Since Brazil independence in 1822, it has always suffered from high indebtedness and periods of inflation and hyperinflation which after successive economic stabilization plans, has made the economy increasingly gloomy for companies in general. Only in 1994, with the Real Plan, the Brazilian economy has balanced with adequate inflation for developing countries. However, external shocks came with the Mexican, Asian and Russian financial crises. After five years of stabilization of inflation, in 1999, Brazil was obliged to abandon one of the pillars of support of the Real Plan: the exchange anchor. Thus, with the adoption of the macroeconomic tripod of "Inflation Targets", "Primary Surplus" and "Floating Exchange", Brazil has resumed GDP growth and controls inflation. At this moment, the Monetary Policy (Contractionary or Expansionist) has gained important role, mainly when the federal government has started to use the SELIC rate as basic interest parameter of the Brazilian economy and one of the strong formal instruments of control of inflation. The objective of this research has known (i) there are influence of Monetary Policy on the EBITDA’s performance of the companies listed on the São Paulo Stock Exchange and (ii) how long after the increase or decrease the SELIC Rate (Brazilian Monetary Policy), there is an impact on companies’ EBITDA. This research has been motivated by the relevance and timeliness of that topics because the SELIC rate to control the rise in inflation for reasons exogenous to the companies in general, has influenced the endogenous performance of these same companies, affecting one of the most important economic-financial-accounting: the EBITDA. The methodology has used, which included the development of a statistical and macroeconomic model own, has been regression in the data panel, with a detailed analysis of the 17 segments of companies in which the 314 companies surveyed have distributed. The results have indicated that there is influence of the Monetary Policy in the EBITDA of some sectors of companies with a three-month and a nine-month time span predominance, with relevant statistical significance. It has concluded that the unique and different moments in which the Monetary Policy is used by the monetary authority has influenced the operational performance of the companies, translated by the accounting-financial managerial indicator called EBITDA / O Brasil, desde a sua independência, em 1822, sempre sofreu com elevado endividamento e com períodos de inflação e hiperinflação que, após sucessivos planos econômicos de estabilização, tornavam a economia cada vez mais sombria para as empresas em geral. Somente em 1994, com o Plano Real, a economia brasileira foi equilibrada com uma inflação adequada para países em desenvolvimento. Entretanto, choques externos vieram com as crises financeiras mexicana, asiática e russa. Após cinco anos de estabilização da inflação, em 1999, viu-se obrigado a abandonar um dos pilares de sustentação do Plano Real: a âncora cambial. Com a adoção do tripé macroeconômico de “Metas de Inflação”, “Superávit Primário” e “Câmbio Flutuante”, o Brasil retoma o crescimento do PIB e controla a inflação. Nesse momento, a política monetária (contracionista ou expansionista) ganha importante e fundamental papel, principalmente quando o governo federal passa a usar a taxa no Selic como parâmetro de juros básicos da economia brasileira e um dos fortes instrumentos formais de controle de inflação. Desse modo, o objetivo desta pesquisa é verificar (i) qual a influência da política monetária no desempenho do Ebitda das empresas listadas na Bolsa de Valores de São Paulo e (ii) em quanto tempo, após a elevação ou diminuição da Taxa Selic (principal instrumento utilizado na política monetária brasileira) há impacto no Ebitda das empresas. Esta pesquisa foi motivada pela relevância e atualidade dos temas porque o manejo da taxa no Selic, para controlar a subida da inflação por motivos exógenos às empresas em geral, passa a influenciar a performance endógena dessas empresas, afetando um dos pontos econômico-financeiro-contábil mais relevantes: o Ebitda. A metodologia utilizada, que contou com o desenvolvimento de um modelo estatístico e macroeconômico próprio, foi a regressão para dados em painel, com a análise pormenorizada dos 17 segmentos de empresas em que foram distribuídas as 314 empresas pesquisadas. Os resultados obtidos indicam que há influência da política monetária no Ebitda de alguns setores de empresas com lapso temporal predominante de três meses e de nove meses, com significância estatística relevante. Concluiu-se que os singulares e diferentes momentos em que a política monetária é utilizada pela autoridade monetária influencia a performance operacional das empresas, traduzidas pelo indicador contábil-financeiro gerencial chamado Ebitda

This work describes a wave of ballads in the czech poetry before WWI. The work has two parts. The first part maps teoretical basis of studied scientific works about ballads and baladism. Part two contains interpretation of partial texts of poetical ballads or balladic poems. This part try to catch the interpretation from the sight of traditional view of ballads and also to define individual, the tradition exceeded, conceptions. Key words Ballad, the czech poetry before WWI, Antonín Sova, Jaroslav Durych, Petr Bezruč, Viktor Dyk, Fráňa Šrámek, balladic motives.

O preparo de misturas de areia-asfalto a frio com emulsão asfáltica possui algumas características que dificultam a avaliação de seu desempenho através de ensaios de laboratório. Estas características são atribuídas à emulsão asfáltica que necessita de cuidados adicionais em relação a outros tipos de ligantes betuminosos. Um desses cuidados é o procedimento de cura antes da compactação para favorecer a perda de umidade das misturas. Neste trabalho é avaliada a influência da perda de umidade de três tipos de misturas de areia-asfalto a frio - misturas sem filler, com filler de pedregulho britado e com filler de cimento Portland, sobre os resultados de alguns ensaios de laboratório. Os ensaios usados para esta avaliação foram: dosagens sem cura e com cura antes da compactação das misturas; controle da perda de umidade; ensaios Marshall com variação da perda de umidade e fluência por compressão uniaxial estática. A perda de umidade antes da compactação das misturas mostrou-se um importante fator de influência nos resultados do ensaio Marshall. Porém, o ensaio de fluência por compressão uniaxial estática revelou que mesmo as misturas com melhor desempenho no ensaio Marshall são muito suscetíveis à deformação permanente e com ruptura frágil mesmo sob a ação de tensões axiais relativamente baixas. / The preparation of cold sand-asphalt mixtures with asphalt emulsion has some characteristics that can affect the laboratory evaluation of its performance. These characteristics are attributed to asphaltic emulsion that needs additional cares in relation to others types of bituminous binders. One of these cares is the curing procedure before compaction, to favor moisture loss. In this work the influence of moisture loss on the results of some laboratory tests is evaluated for three cold sand-asphalt mixtures - mixtures without filler, with crushed gravel filler and with portland cement filler. The tests used for this evaluation are: optimum asphalt content with and without curing before the mixtures compaction, moisture loss control, Marshall tests with moisture loss variation and static creep test. Moisture loss before compaction showed to have a clear influence on the results of Marshall tests. However the static creep test revealed that even those mixtures with the best Marshall test performances are very susceptible to permanent deformation and fragile rupture under low axial stress.

Submitted by Filipe dos Santos (fsantos@pucsp.br) on 2017-12-11T11:12:56Z No. of bitstreams: 1 Joaquim Caldas Neto.pdf: 1291653 bytes, checksum: 10a46759df81f271d593e7f1cd60fe7a (MD5) / Made available in DSpace on 2017-12-11T11:12:56Z (GMT). No. of bitstreams: 1 Joaquim Caldas Neto.pdf: 1291653 bytes, checksum: 10a46759df81f271d593e7f1cd60fe7a (MD5) Previous issue date: 2017-11-23 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / The present study sought to deepen the analysis of the rules regarding the guarantee in the fiscal foreclosures, focusing on the attachment role, currently foreseen in art. 11 of the Law on Tax Enforcement - LEF (Law 6.830 / 80) and art. 835 of the Civil Procedure Code of 2015 - CPC / 2015. This issue is justified in view of the relevance of tax enforcement in the scope of the Judiciary, since they correspond to more than half of the total stock of cases in the first instance. Therefore, we consider that to analyze the procedure of guarantee of executive actions for the collection of tribute is a useful subject for the homeland doctrine. Analyzing specifically the issue of the attachment role, this study indicated as a hypothesis the verification as to whether or not to follow the attachment order of art. 11 of the LEF and art. 835 of CPC / 2015. Given the breadth of the topic, to study whether or not mandatory in the follow-up of the attachment role, the study limited as a passive study parameter to micro and small companies. In addition to the limitation of the analysis regarding these legal entities, the study sought to verify whether the possible mandatory or not of this attachment order, for micro and small companies, violates the principle of isonomy. Thus, to verify whether the relativization of the attachment order and whether this possible flexibilization respects the principle of equality, the present study chose, as a theoretical-methodological aspect, to use as a parameter the neo-constitutionalist school, which studies certain current behaviors of the legal order , such as: the valuation of the dignity of the human person, the prevalence and direct application of principles. Being one of the characteristics of this school the prevalence of normativity of the principles, this was relevant to this study, since one of the other assumptions chosen for the analysis of the obligation of the attachment role is to verify if this flexibility respects the principle of isonomy. Therefore, the criteria that were used by this study regarding the relativization of the attachment order were: (i) the executed be micro and small companies; (ii) and whether relativization respected the principle of equality, based on the procedure established by Celso Antônio Bandeira de Mello. The procedure used in the present study was to verify the possibility of flexibilization of the attachment role of art. 11 of the LEF and art. 835 of the CPC / 2015, for the micro and small companies, based on the principle of isonomy, using the Celso Antônio Bandeira de Mello procedure, having as context the neoconstitutionalist school. At the end, regarding the results obtained, this study confirmed the possibility of flexibilization of the attachment order of art. 11 of the LEF and art. 835 of CPC / 15 by the judge, from the concrete case, and it is legal to use the commercial framework as micro and small company as a criterion for the judge to relax the attachment role. In addition, it was verified that the relativization of the attachment order for micro and small companies respects the principle of isonomy, based on the procedure established by Celso Antônio Bandeira de Mello / O presente estudo buscou aprofundar a análise das regras quanto à garantia nas execuções fiscais, com foco no rol de penhora, atualmente previsto nos art. 11 da Lei de Execuções Fiscais – LEF (Lei n. 6.830/80) e art. 835 do Código de Processo Civil de 2015 – CPC/2015. Justifica-se esse tema em face da relevância que as execuções fiscais possuem no âmbito do Poder Judiciário, haja vista que elas correspondem a mais da metade do estoque total de processos em primeira instância. Portanto, consideramos que analisar o procedimento de garantia das ações executivas para a cobrança de tributo é uma matéria útil para a doutrina pátria. Analisando especificamente a questão do rol de penhora, este estudo indicou como hipótese a verificação quanto à obrigatoriedade ou não do seguimento da ordem de penhora dos art. 11 da LEF e art. 835 do CPC/2015. Dada a amplitude do tema, para analisar a obrigatoriedade ou não no seguimento do rol de penhora, o estudo limitou como sujeito passivo parâmetro de estudo as micro e pequenas empresas. Além da limitação da análise quanto a essas pessoas jurídicas, o estudo buscou verificar se a possível obrigatoriedade ou não dessa ordem de penhora, para as micro e pequenas empresas, viola o princípio da isonomia. Assim, para realizar a verificação se a relativização da ordem de penhora e se essa possível flexibilização respeita o princípio da igualdade, o presente estudo escolheu, como aspecto teórico-metodológico, utilizar como parâmetro a escola neoconstitucionalista, que estuda determinados comportamentos atuais do ordenamento jurídico, tais como: a valoração da dignidade da pessoa humana, a prevalência e aplicação direta dos princípios. Sendo uma das características dessa escola a prevalência de normatividade dos princípios, esta foi relevante para este estudo, na medida em que um dos outros pressupostos escolhidos para a análise da obrigatoriedade do rol de penhora é verificar se essa flexibilização respeita o princípio da isonomia. Logo, os critérios que foram utilizados por este estudo quanto à relativização da ordem de penhora foram: (i) o executado ser micro e pequenas empresas; (ii) e se a relativização respeitou o princípio da igualdade, a partir do procedimento estabelecido por Celso Antônio Bandeira de Mello. Portanto, o procedimento utilizado no presente estudo foi verificar a possiblidade de flexibilização do rol de penhora dos art. 11 da LEF e art. 835 do CPC/2015, para as micro e pequenas empresas, a partir do princípio da isonomia, utilizando o procedimento de Celso Antônio Bandeira de Mello, tendo como contexto a escola neoconstitucionalista. Ao final, quanto aos resultados obtidos, este estudo confirmou a possibilidade de flexibilização da ordem de penhora do art. 11 da LEF e art. 835 do CPC/15 pelo juiz, a partir do caso concreto, sendo legal utilizar o enquadramento comercial como micro e pequena empresa como critério para que o juiz flexibilize o rol de penhora. Além disso, constatou-se que a relativização da ordem de penhora para as micro e pequenas empresas respeita o princípio da isonomia, a partir do procedimento estabelecido por Celso Antônio Bandeira de Mello

Submitted by Filipe dos Santos (fsantos@pucsp.br) on 2018-04-02T12:31:47Z No. of bitstreams: 1 Gabriel Capristo Stecca.pdf: 1367588 bytes, checksum: c43a5991510848c877335264ac016d2d (MD5) / Made available in DSpace on 2018-04-02T12:31:47Z (GMT). No. of bitstreams: 1 Gabriel Capristo Stecca.pdf: 1367588 bytes, checksum: c43a5991510848c877335264ac016d2d (MD5) Previous issue date: 2018-03-01 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / The present research seeks to develop the concept and the application of the social function of tax. The tax law is thought under aspects of the General Theory of Law. There is an intense discussion between law and politics and on the inception and clashes between legal positivism, justarilism and post-positisvism. The dissertation progresses and is accredited in the Robert Alexy‘s Theory of Principles; reanalyses tax law institutes already consolidated in the Republican Constitution of 1988, such equality, private property, solidarity, dignity and makes a heterodox theoretical about the Marxist view of tax law. All research is based on the idea of tax justice, the accomplishment of the social function of tax as a means of financing the State, promote the social equality and reduce the socioeconomics distances / A presente pesquisa busca desenvolver o conceito e a aplicação da função social do tributo. O direito tributário está refletido sob os aspectos da Teoria Geral do Direito. Há uma intensa discussão entre direito e política e sobre a formação e os embates entre positivismo jurídico, jusnaturalismo e pós-positivismo. A dissertação progride e credencia-se na Teoria dos Princípios de Robert Alexy; reanalisa institutos do direito tributário, já consolidados, na Constituição Republicana de 1988, como a igualdade, a propriedade privada, solidariedade, dignidade e faz um adentro teórico-heterodoxo sobre a visão Marxista do direito tributário. Toda pesquisa está pautada na ideia de justiça fiscal, o cumprimento da função social do tributo como meio de financiamento do Estado, promover a igualdade social e reduzir as distâncias socioeconômicas

Catholic Church--Pennsylvania--Periodicals; Catholic Church--United States--Periodicals; Catholic--Pennsylvania--Periodicals; Pittsburgh (Pa.)--Newspapers; Pittsburgh (Pa.)--Periodicals; United States--Pennsylvania--Allegheny--Pittsburgh;

The problem of object detection deals with determining whether an instance of a given class of object is present or not. There are robust, supervised learning based algorithms available for object detection in an image. These image object detectors (image-based object detectors) use characteristics learnt from the training samples to find object and non-object regions. The characteristics used are such that the detectors work under a variety of conditions and hence are very robust. Object detection in video can be performed by using such a detector on each frame of the video sequence. This approach checks for presence of an object around each pixel, at different scales. Such a frame-based approach completely ignores the temporal continuity inherent in the video. The detector declares presence of the object independent of what has happened in the past frames. Also, various visual cues such as motion and color, which give hints about the location of the object, are not used. The current work is aimed at building a generic framework for using a supervised learning based image object detector for video that exploits temporal continuity and the presence of various visual cues. We use temporal continuity and visual cues to speed up the detection and improve detection accuracy by considering past detection results. We propose a generic framework, based on Experiential Sampling [1], which considers temporal continuity and visual cues to focus on a relevant subset of each frame. We determine some key positions in each frame, called attention samples, and object detection is performed only at scales with these positions as centers. These key positions are statistical samples from a density function that is estimated based on various visual cues, past experience and temporal continuity. This density estimation is modeled as a Bayesian Filtering problem and is carried out using Sequential Monte Carlo methods (also known as Particle Filtering), where a density is represented by a weighted sample set. The experiential sampling framework is inspired by Neisser’s perceptual cycle [2] and Itti-Koch’s static visual attention model[3]. In this work, we first use Basic Experiential Sampling as presented in[1]for object detection in video and show its limitations. To overcome these limitations, we extend the framework to effectively combine top-down and bottom-up visual attention phenomena. We use learning based detector’s response, which is a top-down cue, along with visual cues to improve attention estimate. To effectively handle multiple objects, we maintain a minimum number of attention samples per object. We propose to use motion as an alert cue to reduce the delay in detecting new objects entering the field of view. We use an inhibition map to avoid revisiting already attended regions. Finally, we improve detection accuracy by using a particle filter based detection scheme [4], also known as Track Before Detect (TBD). In this scheme, we compute likelihood of presence of the object based on current and past frame data. This likelihood is shown to be approximately equal to the product of average sample weights over past frames. Our framework results in a significant reduction in overall computation required by the object detector, with an improvement in accuracy while retaining its robustness. This enables the use of learning based image object detectors in real time video applications which otherwise are computationally expensive. We demonstrate the usefulness of this framework for frontal face detection in video. We use Viola-Jones’ frontal face detector[5] and color and motion visual cues. We show results for various cases such as sequences with single object, multiple objects, distracting background, moving camera, changing illumination, objects entering/exiting the frame, crossing objects, objects with pose variation and sequences with scene change. The main contributions of the thesis are i) We give an experiential sampling formulation for object detection in video. Many concepts like attention point and attention density which are vague in[1] are precisely defined. ii) We combine detector’s response along with visual cues to estimate attention. This is inspired by a combination of top-down and bottom-up attention maps in visual attention models. To the best of our knowledge, this is used for the first time for object detection in video. iii) In case of multiple objects, we highlight the problem with sample based density representation and solve by maintaining a minimum number of attention samples per object. iv) For objects first detected by the learning based detector, we propose to use a TBD scheme for their subsequent detections along with the learning based detector. This improves accuracy compared to using the learning based detector alone. This thesis is organized as follows . Chapter 1: In this chapter we present a brief survey of related work and define our problem. . Chapter 2: We present an overview of biological models that have motivated our work. . Chapter 3: We give the experiential sampling formulation as in previous work [1], show results and discuss its limitations. . Chapter 4: In this chapter, which is on Enhanced Experiential Sampling, we suggest enhancements to overcome limitations of basic experiential sampling. We propose track-before-detect scheme to improve detection accuracy. . Chapter 5: We conclude the thesis and give possible directions for future work in this area. . Appendix A: A description of video database used in this thesis. . Appendix B: A list of commonly used abbreviations and notations.