SocialLDA:Scalable Topic Modeling in Social Networks

Thesis (Master's)--University of Washington, 2012

Incidencia de la política de autonomía fiscal de los Estados miembros de la UE en el comercio intrazona. Estudio de caso: El Impuesto Excepcional de Crisis húngaro en su relación comercial con Austria y Alemania. Período 2010-2011

En el año 2010 el gobierno húngaro implementó el Impuesto Excepcional de Crisis, que grava a las empresas del sector de telecomunicaciones, energía y agroalimentario con el fin de hacer frente a los graves problemas fiscales que aquejaban a Hungría. Dicho impuesto se enmarca dentro de la política de autonomía fiscal de los Estados miembros de la UE, ya que cada gobierno tiene potestad para determinar la cuantía de los impuestos sobre las empresas con el fin de que se puedan cumplir los intereses económicos nacionales; aun así, dicha autonomía se basa en el respeto al tratado de Maastricht y al pacto de estabilidad y crecimiento, que establecen que las políticas fiscales de los Estados miembros deben estar en armonía con la libre circulación de mercancías, servicios y capitales, así como un trato equitativo a todas las empresas, ya sean nacionales o extranjeras. Este gravamen recae principalmente en empresas ligadas al sector de las exportaciones en Hungría, con nacionalidad de Austria y Alemania, los principales socios comerciales de Hungría, afectando de esta forma las relaciones comerciales de los actores en mención. Así, el trabajo analiza las implicaciones que tiene dicho impuesto para la consecución del interés económico de Hungría, a partir de su incidencia en las metas fiscales y el comercio que este Estado tiene con Austria y Alemania.

Estado situacional de los modelos basados en agentes y su impacto en la investigación organizacional

En un mundo hiperconectado, dinámico y cargado de incertidumbre como el actual, los métodos y modelos analíticos convencionales están mostrando sus limitaciones. Las organizaciones requieren, por tanto, herramientas útiles que empleen tecnología de información y modelos de simulación computacional como mecanismos para la toma de decisiones y la resolución de problemas. Una de las más recientes, potentes y prometedoras es el modelamiento y la simulación basados en agentes (MSBA). Muchas organizaciones, incluidas empresas consultoras, emplean esta técnica para comprender fenómenos, hacer evaluación de estrategias y resolver problemas de diversa índole. Pese a ello, no existe (hasta donde conocemos) un estado situacional acerca del MSBA y su aplicación a la investigación organizacional. Cabe anotar, además, que por su novedad no es un tema suficientemente difundido y trabajado en Latinoamérica. En consecuencia, este proyecto pretende elaborar un estado situacional sobre el MSBA y su impacto sobre la investigación organizacional.

Land Cover Sampling Biases Associated with Roadside Bird Surveys

Roadside surveys such as the Breeding Bird Survey (BBS) are widely used to assess the relative abundance of bird populations. The accuracy of roadside surveys depends on the extent to which surveys from roads represent the entire region under study. We quantified roadside land cover sampling bias in Tennessee, USA, by comparing land cover proportions near roads to proportions of the surrounding region. Roadside surveys gave a biased estimate of patterns across the region because some land cover types were over- or underrepresented near roads. These biases changed over time, introducing varying levels of distortion into the data. We constructed simulated population trends for five bird species of management interest based on these measured roadside sampling biases and on field data on bird abundance. These simulations indicated that roadside surveys may give overly negative assessments of the population trends of early successional birds and of synanthropic birds, but not of late-successional birds. Because roadside surveys are the primary source of avian population trend information in North America, we conclude that these surveys should be corrected for roadside land cover sampling bias. In addition, current recommendations about the need to create more early successional habitat for birds may need reassessment in the light of the undersampling of this habitat by roads.

Planning in the face of ‘deep divisions’: a view from Beirut, Lebanon

This article discusses planning in the global South-East while focusing on the specific context of social divides, political turmoil and conflict situations. The article proposes a five-way framework based on political science and planning to theory to analyse such contexts. The article explores the case of Beirut, Lebanon that has undergone several episodes of internal and external conflicts resulting in a society splintered along sectarianism. Three Two case studies of open urban spaces and their public activities are analysed using the five-way framework The discussion indicates how economic liberalism that is prevalent in countries of the South-East, along with place-based identities, interest-based identities, consensus orientated processes and institutionalism might facilitate a cultivation of deep values away from a narrowly constructed identity. The article argues that planners should understand the options for positive action that aim to bridge deep divisions and suggests that the five-way framework provides a reference for contextualising in different ways to suit particular contexts. Therefore, the framework is not necessarily restricted to the South-East but could be applicable to any context which manifests deep divisions.

Gestão intercultural: a experiência de executivos brasileiros no México

O presente trabalho tem por objetivo levantar quais as dificuldades que os executivos brasileiros, caracterizados por um estilo gerencial brasileiro, enfrentam ao fazer negócios e trabalhar no México. Escolhemos Brasil e México por dois motivos: o primeiro é que atualmente estes dois países representam as duas maiores economias da América Latina, sendo responsáveis por mais de 60% do PIB da região. O segundo é nosso interesse pessoal, devido nossa própria experiência de trabalho, iniciada em 2002 (e que continua acontecendo até o presente momento) quando começamos a interagir com o México no nosso trabalho cotidiano dentro de uma empresa privada. Para alcançar o nosso objetivo primeiramente definimos o que é cultura, cultura nacional, e como ela afeta o estilo gerencial. Estudamos na bibliografia os estilos gerenciais brasileiro e mexicano, e utilizamos o modelo de comparação de estilos gerenciais de Hofstede para identificar as diferenças entre eles, pois acreditamos que as dificuldades se relacionam com as diferenças entre os dois estilos. Posteriormente, fizemos uma pesquisa de campo, entrevistando de forma semi-estruturada sete executivos brasileiros que trabalharam no México para confirmar as diferenças nos estilos gerenciais e levantar quais foram as dificuldades que eles tiveram por conta das mesmas. Finalmente, apresentamos essas diferenças e concluímos que, ainda que os estilos gerenciais de ambos os países sejam próximos – e isso se reflete nos rankings que ambos ocupam nas quatro dimensões de Hofstede – as diferenças trazem sim dificuldades que precisam ser levadas em conta para facilitar a adaptação e o sucesso nos desafios profissionais que os executivos brasileiros venham a empreender no México.

Procedimento de manifestação de interesse: interesse de quem?

O Procedimento de Manifestação de Interesse (“PMI”) vem sendo utilizado por diferentes entes federativos brasileiros, principalmente nos últimos dois anos, quando o instituto foi regulamentado em muitos Estados. Seu objetivo é viabilizar a modelagem de projetos de infraestrutura sem onerar os cofres públicos e sem requerer expertise técnica pública. Insere-se no contexto de incentivo às possíveis sinergias oriundas das parcerias entre os setores público e privado. Entretanto, é importante considerar como principal obstáculo para a utilização do PMI a possibilidade de discrepância entre o interesse público e o privado. A análise econômica do direito oferece ferramentas capazes de contribuir com a averiguação dessa possível discrepância, tal como a teoria da agência. As premissas teóricas da agência podem ser aplicada à autorização conferida pelo poder público ao particular. No que tange ao conteúdo, o interesse visado pelo mercado com a elaboração de estudos de viabilidade pode destoar da persecução pelo interesse público, norte da Administração Pública. Em nível procedimental, é possível que ocorra a captura do interesse público na realização de um procedimento licitatório – capaz de selecionar o parceiro privado mais apto a cumprir com o objeto contratual – pelo particular autorizado a elaborar os estudos de viabilidade. Para tanto, foi realizado levantamento empírico acerca dos projetos de infraestrutura modelados via PMI, em que já ocorreu a licitação para contratos de PPPs, a fim de confirmar a hipótese de captura.

Preferência por redistribuição afeta a decisão individual de voto?

Parte dos estudos em economia e ciência política argumenta que preferências por redistribuição são capazes de explicar os diferentes esforços redistributivos ao redor do mundo. É natural pensar que a decisão de voto é o único canal relevante para que esta argumentação seja válida. Este trabalho buscará evidências empíricas de que haja correlação entre preferências por redistribuição e a decisão individual de voto nos Estados Unidos. Primeiro, apresento um modelo teórico que faz ligação entre a identificação partidária do indivíduo com seus interesses próprios e coletivos. Com base neste modelo, serão usados dados do General Social Survey para encontrar tais relações. Nos resultados encontra-se que as preferências por redistribuição estão relacionadas à identificação partidária e, consequentemente, à decisão de voto por redistribuição. Há também alguma evidência de que esta influência esteja crescendo nas últimas décadas.

The influence of subpixel measurement on digital camera calibration

The aim of this work is to evaluate the influence of point measurements in images, with subpixel accuracy, and its contribution in the calibration of digital cameras. Also, the effect of subpixel measurements in 3D coordinates of check points in the object space will be evaluated. With this purpose, an algorithm that allows subpixel accuracy was implemented for semi-automatic determination of points of interest, based on Fõrstner operator. Experiments were accomplished with a block of images acquired with the multispectral camera DuncanTech MS3100-CIR. The influence of subpixel measurements in the adjustment by Least Square Method (LSM) was evaluated by the comparison of estimated standard deviation of parameters in both situations, with manual measurement (pixel accuracy) and with subpixel estimation. Additionally, the influence of subpixel measurements in the 3D reconstruction was also analyzed. Based on the obtained results, i.e., on the quantification of the standard deviation reduction in the Inner Orientation Parameters (IOP) and also in the relative error of the 3D reconstruction, it was shown that measurements with subpixel accuracy are relevant for some tasks in Photogrammetry, mainly for those in which the metric quality is of great relevance, as Camera Calibration.

Auditory motion direction encoding in auditory cortex and high-level visual cortex

The aim of this functional magnetic resonance imaging (fMRI) study was to identify human brain areas that are sensitive to the direction of auditory motion. Such directional sensitivity was assessed in a hypothesis-free manner by analyzing fMRI response patterns across the entire brain volume using a spherical-searchlight approach. In addition, we assessed directional sensitivity in three predefined brain areas that have been associated with auditory motion perception in previous neuroimaging studies. These were the primary auditory cortex, the planum temporale and the visual motion complex (hMT/V5+). Our whole-brain analysis revealed that the direction of sound-source movement could be decoded from fMRI response patterns in the right auditory cortex and in a high-level visual area located in the right lateral occipital cortex. Our region-of-interest-based analysis showed that the decoding of the direction of auditory motion was most reliable with activation patterns of the left and right planum temporale. Auditory motion direction could not be decoded from activation patterns in hMT/V5+. These findings provide further evidence for the planum temporale playing a central role in supporting auditory motion perception. In addition, our findings suggest a cross-modal transfer of directional information to high-level visual cortex in healthy humans.

New therapies for pneumococcal meningitis

The treatment of pneumococcal meningitis remains a major challenge, as reflected by the continued high morbidity and case fatality of the disease. The worldwide increase of penicillin-resistant pneumococci and more recently cephalosporin- and vancomycin-tolerant pneumococci has jeopardised the efficacy of standard treatments based on extended spectrum cephalosporins alone or in combination with vancomycin. This review provides a summary of newly developed antibiotics tested in the rabbit meningitis model. In particular, newer beta-lactam monotherapies (cefepime, meropenem, ertapenem), recently developed quinolones (garenoxacin, gemifloxacin, gatifloxacin, moxifloxacin) and a lipopeptide antibiotic (daptomycin) are discussed. A special emphasis is placed on the potential role of combination treatments with some of the new compounds, which are of interest based on the background of increasing resistance problems due to their often synergistic activity in the rabbit model of pneumococcal meningitis.

Positron emission mammography in the diagnosis of breast cancer. Is maximum PEM uptake value a valuable threshold for malignant breast cancer detection?

AIM To evaluate the diagnostic value (sensitivity, specificity) of positron emission mammography (PEM) in a single site non-interventional study using the maximum PEM uptake value (PUVmax). PATIENTS, METHODS In a singlesite, non-interventional study, 108 patients (107 women, 1 man) with a total of 151 suspected lesions were scanned with a PEM Flex Solo II (Naviscan) at 90 min p.i. with 3.5 MBq 18F-FDG per kg of body weight. In this ROI(region of interest)-based analysis, maximum PEM uptake value (PUV) was determined in lesions, tumours (PUVmaxtumour), benign lesions (PUVmaxnormal breast) and also in healthy tissues on the contralateral side (PUVmaxcontralateral breast). These values were compared and contrasted. In addition, the ratios of PUVmaxtumour / PUVmaxcontralateral breast and PUVmaxnormal breast / PUVmaxcontralateral breast were compared. The image data were interpreted independently by two experienced nuclear medicine physicians and compared with histology in cases of suspected carcinoma. RESULTS Based on a criteria of PUV>1.9, 31 out of 151 lesions in the patient cohort were found to be malignant (21%). A mean PUVmaxtumour of 3.78 ± 2.47 was identified in malignant tumours, while a mean PUVmaxnormal breast of 1.17 ± 0.37 was reported in the glandular tissue of the healthy breast, with the difference being statistically significant (p < 0.001). Similarly, the mean ratio between tumour and healthy glandular tissue in breast cancer patients (3.15 ± 1.58) was found to be significantly higher than the ratio for benign lesions (1.17 ± 0.41, p < 0.001). CONCLUSION PEM is capable of differentiating breast tumours from benign lesions with 100% sensitivity along with a high specificity of 96%, when a threshold of PUVmax >1.9 is applied.

Fragilariopsis kerguelensis images from sediment core PS1768-8

Background: Light microscopic analysis of diatom frustules is widely used both in basic and applied research, notably taxonomy, morphometrics, water quality monitoring and paleo-environmental studies. In these applications, usually large numbers of frustules need to be identified and / or measured. Although there is a need for automation in these applications, and image processing and analysis methods supporting these tasks have previously been developed, they did not become widespread in diatom analysis. While methodological reports for a wide variety of methods for image segmentation, diatom identification and feature extraction are available, no single implementation combining a subset of these into a readily applicable workflow accessible to diatomists exists. Results: The newly developed tool SHERPA offers a versatile image processing workflow focused on the identification and measurement of object outlines, handling all steps from image segmentation over object identification to feature extraction, and providing interactive functions for reviewing and revising results. Special attention was given to ease of use, applicability to a broad range of data and problems, and supporting high throughput analyses with minimal manual intervention. Conclusions: Tested with several diatom datasets from different sources and of various compositions, SHERPA proved its ability to successfully analyze large amounts of diatom micrographs depicting a broad range of species. SHERPA is unique in combining the following features: application of multiple segmentation methods and selection of the one giving the best result for each individual object; identification of shapes of interest based on outline matching against a template library; quality scoring and ranking of resulting outlines supporting quick quality checking; extraction of a wide range of outline shape descriptors widely used in diatom studies and elsewhere; minimizing the need for, but enabling manual quality control and corrections. Although primarily developed for analyzing images of diatom valves originating from automated microscopy, SHERPA can also be useful for other object detection, segmentation and outline-based identification problems.