Automatização de administração e segurança em redes Windows NT

Orientadores: Paulo Licio de Geus, Celio Cardoso GuimarãesDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de ComputaçãoResumo: A administração, a manutenção da segurança e o gerenciamento de grandes redes de computadores baseados em Windows NT são tarefas desafiadoras e trabalhosas. Algumas tarefas podem se tornar extremamente laboriosas para os administradores dessas redes, como por exemplo: instalação remota de programas, auditoria e modificação de uma configuração de segurança remota ou melhorar o desempenho de cada máquina. Este trabalho tem como objetivo desenvolver técnicas para automatizar as tarefas de administração de redes Windows NT, tornando-as menos complexas. Além disso, este trabalho apresenta e descreve DoIt4Me ("do it for me"), uma ferramenta de gerenciamento remoto capaz de melhorar a segurança, a administração e o desempenho de cada máquina dessas redesAbstract: The administration, the maintenance of the security and the management of large Windows NT networks are challenging tasks. Some tasks can be extremely laborious, such as: software remote install action, auditing and updating the security configurations or to improve the performance of each network machine. The goal of this work is to develop techniques to automate network administra tive tasks, turning them less complexo Besides that, this work presents DoIt4Me ("do it for me"), a network management tool to improve the security, the administration and the performance of each network machineMestradoMestre em Ciência da Computaçã

Gapped Two-Body Hamiltonian for continuous-variable quantum computation

We introduce a family of Hamiltonian systems for measurement-based quantum computation with continuous variables. The Hamiltonians (i) are quadratic, and therefore two body, (ii) are of short range, (iii) are frustration-free, and (iv) possess a constant energy gap proportional to the squared inverse of the squeezing. Their ground states are the celebrated Gaussian graph states, which are universal resources for quantum computation in the limit of infinite squeezing. These Hamiltonians constitute the basic ingredient for the adiabatic preparation of graph states and thus open new venues for the physical realization of continuous-variable quantum computing beyond the standard optical approaches. We characterize the correlations in these systems at thermal equilibrium. In particular, we prove that the correlations across any multipartition are contained exactly in its boundary, automatically yielding a correlation area law.Comment: 4 pages, one figure. New version: typos corrected, one reference added. To appear in PR

The algebro-geometric study of range maps

Localizing a radiant source is a widespread problem to many scientific and technological research areas. E.g. localization based on range measurements stays at the core of technologies like radar, sonar and wireless sensors networks. In this manuscript we study in depth the model for source localization based on range measurements obtained from the source signal, from the point of view of algebraic geometry. In the case of three receivers, we find unexpected connections between this problem and the geometry of Kummer's and Cayley's surfaces. Our work gives new insights also on the localization based on range differences.Comment: 38 pages, 18 figure

Design study of a photon beamline for a soft X-ray FEL driven by high gradient acceleration at EuPRAXIA@SPARC_LAB

We are proposing a facility based on high gradient acceleration via x-band RF structures and plasma acceleration. We plan to reach an electron energy of the order of 1 GeV, suitable to drive a Free Electron Laser for applications in the so called "water window" (2 - 4 nm). A conceptual design of the beamline, from the photon beam from the undulators to the user experimental chamber, mainly focusing on diagnostic, manipulation and transport of the radiation is presented and discussed. We also briefly outline a user end station for coherent imaging, laser ablation and pump-probe experiments

A latent rhythm complexity model for attribute-controlled drum pattern generation

AbstractMost music listeners have an intuitive understanding of the notion of rhythm complexity. Musicologists and scientists, however, have long sought objective ways to measure and model such a distinctively perceptual attribute of music. Whereas previous research has mainly focused on monophonic patterns, this article presents a novel perceptually-informed rhythm complexity measure specifically designed for polyphonic rhythms, i.e., patterns in which multiple simultaneous voices cooperate toward creating a coherent musical phrase. We focus on drum rhythms relating to the Western musical tradition and validate the proposed measure through a perceptual test where users were asked to rate the complexity of real-life drumming performances. Hence, we propose a latent vector model for rhythm complexity based on a recurrent variational autoencoder tasked with learning the complexity of input samples and embedding it along one latent dimension. Aided by an auxiliary adversarial loss term promoting disentanglement, this effectively regularizes the latent space, thus enabling explicit control over the complexity of newly generated patterns. Trained on a large corpus of MIDI files of polyphonic drum recordings, the proposed method proved capable of generating coherent and realistic samples at the desired complexity value. In our experiments, output and target complexities show a high correlation, and the latent space appears interpretable and continuously navigable. On the one hand, this model can readily contribute to a wide range of creative applications, including, for instance, assisted music composition and automatic music generation. On the other hand, it brings us one step closer toward achieving the ambitious goal of equipping machines with a human-like understanding of perceptual features of music

A Study on Convergence, Divergence and Maintenance in OCD Patients

The aim of this study was to verify if patients with Obsessive-Compulsive Disorder (OCD) adopted self-referential and non-adherent interactive modalities, during face-to-face conversation, to a higher extent as compared with subjects who did not have a diagnosis of OCD. For this purpose, four subjects with OCD and four age, sex and education matched Normal Controls (NC) underwent a semi-structured interview. The video-taped records have been evaluated and coded by means of the Initiative-Response Analysis system (I-R). The interview allowed us to obtain indexes of interactive strategies, namely, convergence, divergence and maintenance, which have been interpreted in the Communication Accommodation Theory (CAT) framework. Subjects with OCD, as compared with both NC and interviewers, mainly used Maintenance strategy, indicating a non-adherence to turns and an over-reliance on their own turns, thus neglecting the partners' contribution. This kind of strategy exclusively correlated with the scores of the Y-BOCS compulsion subscale. Results are consistent with the hypothesis that communication in subjects with OCD relies on particular strategies and support the view that communication is strongly correlated with "personological" variables. This hypothesis may be incorporated (not being incompatible with) in the CAT framework

Ethephon on 'Rubi' grapevine quality in Porto Feliz, SP

A produção de uvas de mesa é uma importante atividade econômica no Estado de São Paulo. A região de Porto Feliz, em clima Cwa, apresenta grande número de agricultores familiares dedicados a esta atividade. Condições climáticas e manejo da cultura durante a fase de amadurecimento determinam a qualidade dos bagos, sendo o uso de fitorreguladores uma ferramenta útil para o ajustamento de atributos da qualidade. Avaliaram-se sete concentrações de ethephon, aplicadas por imersão dos cachos no início da mudança de coloração dos bagos, sobre a qualidade de uva 'Rubi', durante os ciclos de 2007 e de 2008, em propriedade comercial localizada em Porto Feliz-SP. Os atributos de qualidade avaliados foram a coloração de bagos, teor de sólidos solúveis totais e desbagoamento pós-colheita, sendo determinado também o índice de velocidade de desbagoamento. Os dados coletados foram submetidos à análise de variância e de regressão. Em 2007, observaram-se maiores coloração e teor de sólidos solúveis totais, associados às maiores temperaturas registradas no período entre o início de maturação e a colheita. O uso de ethephon, independentemente da concentração utilizada, promoveu coloração mais avermelhada dos bagos de 'Rubi' nas duas safras. Não houve efeito do uso do ethephon sobre o teor de sólidos solúveis totais. Não foi possível inferir sobre o efeito do etephon no desbagoamento em função do elevado coeficiente de variação. Estudos básicos para avaliar o efeito de fatores climáticos, nutricionais e de manejo do vinhedo são necessários no desenvolvimento de coloração dos bagos da cultivar 'Rubi' em clima tropical.Grapevine production for fresh market is an important economic activity in the State of Sao Paulo, Brazil. The region of Porto Feliz is located in Cwa climate and concentrates several small producers. Climatic conditions and cultural practices during fruit maturation determine berry quality, and the use of plant growth regulators is a useful adjustment tool for quality attributes. Seven ethephon concentrations were evaluated on fruit quality of 'Rubi' grapevine in Porto Feliz, SP, Brazil. Ethephon was applied by cluster dipping in the "veraison", and fruits were harvested in 2007 and 2008 (summer harvests). Experimental design was completely randomized with three and four replicates, respectively for 2007 and 2008 harvests. One cluster was the experimental unit with ten or five berries measured. Data comprised of berry color index, fruit total solid soluble and a velocity index of post-harvest berry dropping. Fruits harvested in 2007 presented better color and higher total solid solubles which were probably associated to higher temperatures observed between "veraison" and harvest. The use of ethephon regardless of concentration led to berries with a more prominent red color. On the other hand, ethephon did not influence total solid solubles. It was not possible to evaluate ethephon effect on berry dropping velocity index due to the high coefficient of variance. Basic studies on climatic, nutritional and grapeyard management factors are necessary for berry color development of 'Rubi' grapevine in tropical climate.Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES

DEMUX devices based on a-SiC:H

In this paper we present results about the functioning of a multilayered a-SiC:H heterostructure as a device for wavelength-division demultiplexing of optical signals. The device is composed of two stacked p-i-n photodiodes, both optimized for the selective collection of photogenerated carriers. Band gap engineering was used to adjust the photogeneration and recombination rates profiles of the intrinsic absorber regions of each photodiode to short and long wavelength absorption and carrier collection in the visible spectrum. The photocurrent signal using different input optical channels was analyzed at reverse and forward bias and under steady state illumination. This photocurrent is used as an input for a demux algorithm based on the voltage controlled sensitivity of the device. The device functioning is explained with results obtained by numerical simulation of the device, which permit an insight to the internal electric configuration of the double heterojunction.These results address the explanation of the device functioning in the frequency domain to a wavelength tunable photocapacitance due to the accumulation of space charge localized at the internal junction. The existence of a direct relation between the experimentally observed capacitive effects of the double diode and the quality of the semiconductor materials used to form the internal junction is highlighted