Linked Opinions: Describing Sentiments on the Structured Web of Data

In the paper we report on the results of our experiments on the construction of the opinion ontology. Our aim is to show the benefits of publishing in the open, on the Web, the results of the opinion mining process in a structured form. On the road to achieving this, we attempt to answer the research question to what extent opinion information can be formalized in a unified way. Furthermore, as part of the evaluation, we experiment with the usage of Semantic Web technologies and show particular use cases that support our claims.

Migration to an a on-line laboatory in mechanical engineering. The case of a cam-follower design practice.

The European Higher Education Area (EHEA) has leaded to a change in the way the subjects are taught. One of the more important aspects of the EHEA is to support the autonomous study of the students. Taking into account this new approach, the virtual laboratory of the subject Mechanisms of the Aeronautical studies at the Technical University of Madrid is being migrated to an on-line scheme. This virtual laboratory consist on two practices: the design of cam-follower mechanisms and the design of trains of gears. Both practices are software applications that, in the current situation, need to be installed on each computer and the students carry out the practice at the computer classroom of the school under the supervision of a teacher. During this year the design of cam-follower mechanisms practice has been moved to a web application using Java and the Google Development Toolkit. In this practice the students has to design and study the running of a cam to perform a specific displacement diagram with a selected follower taking into account that the mechanism must be able to work properly at high speed regime. The practice has maintained its objectives in the new platform but to take advantage of the new methodology and try to avoid the inconveniences that the previous version had shown. Once the new practice has been ready, a pilot study has been carried out to compare both approaches: on-line and in-lab. This paper shows the adaptation of the cam and follower practice to an on-line methodology. Both practices are described and the changes that has been done to the initial one are shown. They are compared and the weak and strong points of each one are analyzed. Finally we explain the pilot study carried out, the students impression and the results obtained.

Migration to an a on.line laboratory in mechanical engineering. The case of a cam follower design practice.

The European Higher Education Area (EHEA) has leaded to a change in the way the subjects are taught. One of the more important aspects of the EHEA is to support the autonomous study of the students. Taking into account this new approach, the virtual laboratory of the subject Mechanisms of the Aeronautical studies at the Technical University of Madrid is being migrated to an on-line scheme. This virtual laboratory consist on two practices: the design of cam-follower mechanisms and the design of trains of gears. Both practices are software applications that, in the current situation, need to be installed on each computer and the students carry out the practice at the computer classroom of the school under the supervision of a teacher. During this year the design of cam-follower mechanisms practice has been moved to a web application using Java and the Google Development Toolkit. In this practice the students has to design and study the running of a cam to perform a specific displacement diagram with a selected follower taking into account that the mechanism must be able to work properly at high speed regime. The practice has maintained its objectives in the new platform but to take advantage of the new methodology and try to avoid the inconveniences that the previous version had shown. Once the new practice has been ready, a pilot study has been carried out to compare both approaches: on-line and in-lab. This paper shows the adaptation of the cam and follower practice to an on-line methodology. Both practices are described and the changes that has been done to the initial one are shown. They are compared and the weak and strong points of each one are analyzed. Finally we explain the pilot study carried out, the students impression and the results obtained.

On-line measurement of soil properties without direct spectral response in near infrared spectral range

So far, the majority of reports on on-line measurement considered soil properties with direct spectral responses in near infrared spectroscopy (NIRS). This work reports on the results of on-line measurement of soil properties with indirect spectral responses, e.g. pH, cation exchange capacity (CEC), exchangeable calcium (Caex) and exchangeable magnesium (Mgex) in one field in Bedfordshire in the UK. The on-line sensor consisted of a subsoiler coupled with an AgroSpec mobile, fibre type, visible and near infrared (vis–NIR) spectrophotometer (tec5 Technology for Spectroscopy, Germany), with a measurement range 305–2200 nm to acquire soil spectra in diffuse reflectance mode. General calibration models for the studied soil properties were developed with a partial least squares regression (PLSR) with one-leave-out cross validation, using spectra measured under non-mobile laboratory conditions of 160 soil samples collected from different fields in four farms in Europe, namely, Czech Republic, Denmark, Netherland and UK. A group of 25 samples independent from the calibration set was used as independent validation set. Higher accuracy was obtained for laboratory scanning as compared to on-line scanning of the 25 independent samples. The prediction accuracy for the laboratory and on-line measurements was classified as excellent/very good for pH (RPD = 2.69 and 2.14 and r2 = 0.86 and 0.78, respectively), and moderately good for CEC (RPD = 1.77 and 1.61 and r2 = 0.68 and 0.62, respectively) and Mgex (RPD = 1.72 and 1.49 and r2 = 0.66 and 0.67, respectively). For Caex, very good accuracy was calculated for laboratory method (RPD = 2.19 and r2 = 0.86), as compared to the poor accuracy reported for the on-line method (RPD = 1.30 and r2 = 0.61). The ability of collecting large number of data points per field area (about 12,800 point per 21 ha) and the simultaneous analysis of several soil properties without direct spectral response in the NIR range at relatively high operational speed and appreciable accuracy, encourage the recommendation of the on-line measurement system for site specific fertilisation.

Novel educational assessment for building structures: Automatic evaluation of on-line graphics

This article presents a new automatic evaluation for on-line graphics, its application and the numerous advantages achieved applying this developed correcting method. The software application developed by the Innovation in Education Group “E4”, from the Technical University of Madrid, is oriented for the online self-assessment of the graphic drawings that students carry out as continuous training. The adaptation to the European Higher Educational Area is an important opportunity to research about the possibilities of on-line education assessment. In this way, a new software tool has been developed for continuous self-testing by undergraduates. Using this software it is possible to evaluate the graphical answer of the students. Thus, the drawings made on-line by students are automatically corrected according to the geometry (straight lines, sloping lines or second order curves) and by sizes (depending on the specific values which define the graphics).

New On-Line Excitation-System Ground Fault Location Method Tested in a 106 MVA Synchronous Generator

In this paper, a novel excitation-system ground-fault location method is described and tested in a 106 MVA synchronous machine. In this unit, numerous rotor ground-fault trips took place always about an hour after the synchronization to the network. However, when the field winding insulation was checked after the trips, there was no failure. The data indicated that the faults in the rotor were caused by centrifugal forces and temperature. Unexpectedly, by applying this new method, the failure was located in a cable between the excitation transformer and the automatic voltage regulator. In addition, several intentional ground faults were performed along the field winding with different fault resistance values, in order to test the accuracy of this method to locate defects in rotor windings of large generators. Therefore, this new on-line rotor ground-fault detection algorithm is tested in high-power synchronous generators with satisfactory results.

Comunicação e Governança Corporativa: a informação on-line das empresas do Novo Mercado com o investidor pessoa física

O estudo pretende mostrar que a clareza semântica e a fácil navegabilidade nos sites de Relações com Investidores são essenciais para a comunicação com os investidores individuais bem como para a sua compreensão das Boas Práticas da Governança Corporativa adotadas pelas empresas que aderiram ao Novo Mercado da Bovespa. O trabalho está dividido em quatro etapas. O primeiro capítulo explica o que é Governança Corporativa, como esse conceito foi implementado no Brasil, apresenta o mercado de ações, o Novo Mercado e aborda os temas relacionados ao setor financeiro. Em seguida, aborda a evolução da comunicação empresarial e como as organizações tiveram que adaptar a sua cultura organizacional e os canais de comunicação devido à constante e ininterrupta série de transações (aquisições, fusões e incorporações) que acontecem no Brasil desde 1994, com o início do Plano Real. Esse processo proporcionou uma alteração geopolítica, cultural, econômica e social nas corporações. Ainda nesse capítulo o estudo apresenta as características dos canais que as organizações utilizam para se comunicar com os públicos de referência. Mostra também como a internet e as demais mídias digitais se integraram nesse processo corporativo, a relação com os investidores, os sites de RI das empresas do Novo Mercado e o perfil do investidor individual. Por último, o estudo apresenta a avaliação dos sites de RI, os critérios adotados para analisar a construção das homepages e demais páginas. Nesse ponto, o objetivo foi avaliar a clareza semântica, ou seja, a maneira como as informações são transmitidas para os investidores individuais, a acessibilidade desse canal de comunicação como a quantidade de cliques necessária para ter acesso a qualquer informação e se os sites possuem espaços específicos para esse público. Finalmente, são apresentados os resultados e uma análise da comunicação empresarial dessas empresas antes e depois da entrada das mesmas no Novo Mercado da Bovespa e as considerações finais.(AU)

Comunicação e Governança Corporativa: a informação on-line das empresas do Novo Mercado com o investidor pessoa física

O estudo pretende mostrar que a clareza semântica e a fácil navegabilidade nos sites de Relações com Investidores são essenciais para a comunicação com os investidores individuais bem como para a sua compreensão das Boas Práticas da Governança Corporativa adotadas pelas empresas que aderiram ao Novo Mercado da Bovespa. O trabalho está dividido em quatro etapas. O primeiro capítulo explica o que é Governança Corporativa, como esse conceito foi implementado no Brasil, apresenta o mercado de ações, o Novo Mercado e aborda os temas relacionados ao setor financeiro. Em seguida, aborda a evolução da comunicação empresarial e como as organizações tiveram que adaptar a sua cultura organizacional e os canais de comunicação devido à constante e ininterrupta série de transações (aquisições, fusões e incorporações) que acontecem no Brasil desde 1994, com o início do Plano Real. Esse processo proporcionou uma alteração geopolítica, cultural, econômica e social nas corporações. Ainda nesse capítulo o estudo apresenta as características dos canais que as organizações utilizam para se comunicar com os públicos de referência. Mostra também como a internet e as demais mídias digitais se integraram nesse processo corporativo, a relação com os investidores, os sites de RI das empresas do Novo Mercado e o perfil do investidor individual. Por último, o estudo apresenta a avaliação dos sites de RI, os critérios adotados para analisar a construção das homepages e demais páginas. Nesse ponto, o objetivo foi avaliar a clareza semântica, ou seja, a maneira como as informações são transmitidas para os investidores individuais, a acessibilidade desse canal de comunicação como a quantidade de cliques necessária para ter acesso a qualquer informação e se os sites possuem espaços específicos para esse público. Finalmente, são apresentados os resultados e uma análise da comunicação empresarial dessas empresas antes e depois da entrada das mesmas no Novo Mercado da Bovespa e as considerações finais.(AU)

Sources of selection bias in evaluating social programs: An interpretation of conventional measures and evidence on the effectiveness of matching as a program evaluation method

This paper decomposes the conventional measure of selection bias in observational studies into three components. The first two components are due to differences in the distributions of characteristics between participant and nonparticipant (comparison) group members: the first arises from differences in the supports, and the second from differences in densities over the region of common support. The third component arises from selection bias precisely defined. Using data from a recent social experiment, we find that the component due to selection bias, precisely defined, is smaller than the first two components. However, selection bias still represents a substantial fraction of the experimental impact estimate. The empirical performance of matching methods of program evaluation is also examined. We find that matching based on the propensity score eliminates some but not all of the measured selection bias, with the remaining bias still a substantial fraction of the estimated impact. We find that the support of the distribution of propensity scores for the comparison group is typically only a small portion of the support for the participant group. For values outside the common support, it is impossible to reliably estimate the effect of program participation using matching methods. If the impact of participation depends on the propensity score, as we find in our data, the failure of the common support condition severely limits matching compared with random assignment as an evaluation estimator.

A Hardware-Software Approach for On-Line Soft Error Mitigation in Interrupt-Driven Applications

Integrity assurance of configuration data has a significant impact on microcontroller-based systems reliability. This is especially true when running applications driven by events which behavior is tightly coupled to this kind of data. This work proposes a new hybrid technique that combines hardware and software resources for detecting and recovering soft-errors in system configuration data. Our approach is based on the utilization of a common built-in microcontroller resource (timer) that works jointly with a software-based technique, which is responsible to periodically refresh the configuration data. The experiments demonstrate that non-destructive single event effects can be effectively mitigated with reduced overheads. Results show an important increase in fault coverage for SEUs and SETs, about one order of magnitude.