An unsupervised aspect extraction strategy for monitoring real-time reviews stream     

Mauro Dragoni  Marco Federici  Andi Rexha 《Information processing & management》2019,56(3):1103-1118

One of the most important opinion mining research directions falls in the extraction of polarities referring to specific entities (aspects) contained in the analyzed texts. The detection of such aspects may be very critical especially when documents come from unknown domains. Indeed, while in some contexts it is possible to train domain-specific models for improving the effectiveness of aspects extraction algorithms, in others the most suitable solution is to apply unsupervised techniques by making such algorithms domain-independent and more efficient in a real-time environment. Moreover, an emerging need is to exploit the results of aspect-based analysis for triggering actions based on these data. This led to the necessity of providing solutions supporting both an effective analysis of user-generated content and an efficient and intuitive way of visualizing collected data. In this work, we implemented an opinion monitoring service implementing (i) a set of unsupervised strategies for aspect-based opinion mining together with (ii) a monitoring tool supporting users in visualizing analyzed data. The aspect extraction strategies are based on the use of an open information extraction strategy. The effectiveness of the platform has been tested on benchmarks provided by the SemEval campaign and have been compared with the results obtained by domain-adapted techniques.  相似文献   

An evaluation of an adaptive learning system based on multimodal affect recognition for learners with intellectual disabilities     

Penelope J. Standen  David J. Brown  Mohammad Taheri  Maria J. Galvez Trigo  Helen Boulton  Andrew Burton  Madeline J. Hallewell  James G. Lathe  Nicholas Shopland  Maria A. Blanco Gonzalez  Gosia M. Kwiatkowska  Elena Milli  Stefano Cobello  Annaleda Mazzucato  Marco Traversi  Enrique Hortal 《British journal of educational technology : journal of the Council for Educational Technology》2020,51(5):1748-1765

Artificial intelligence tools for education (AIEd) have been used to automate the provision of learning support to mainstream learners. One of the most innovative approaches in this field is the use of data and machine learning for the detection of a student’s affective state, to move them out of negative states that inhibit learning, into positive states such as engagement. In spite of their obvious potential to provide the personalisation that would give extra support for learners with intellectual disabilities, little work on AIEd systems that utilise affect recognition currently addresses this group. Our system used multimodal sensor data and machine learning to first identify three affective states linked to learning (engagement, frustration, boredom) and second determine the presentation of learning content so that the learner is maintained in an optimal affective state and rate of learning is maximised. To evaluate this adaptive learning system, 67 participants aged between 6 and 18 years acting as their own control took part in a series of sessions using the system. Sessions alternated between using the system with both affect detection and learning achievement to drive the selection of learning content (intervention) and using learning achievement alone (control) to drive the selection of learning content. Lack of boredom was the state with the strongest link to achievement, with both frustration and engagement positively related to achievement. There was significantly more engagement and less boredom in intervention than control sessions, but no significant difference in achievement. These results suggest that engagement does increase when activities are tailored to the personal needs and emotional state of the learner and that the system was promoting affective states that in turn promote learning. However, longer exposure is necessary to determine the effect on learning.  相似文献   

Why do students leave university? Qualitative research at an Italian higher education institution     

Marco Romito  Silvia Pilutti  Dalit Contini 《European Journal of Education》2020,55(3):456-470

In this article, we discuss the results of qualitative research carried out at an Italian university for shedding light on the transition students undergo on entry to university, and for understanding associated difficulties that lead to student drop out. We use Vincent Tinto's and Pierre Bourdieu's theoretical apparatuses for analysing drop out in higher education as a process in which inequalities are expressed and reproduced. The intertwined social and institutional mechanisms, and flawed decision-making processes, that precede entry to university are explored. Particular attention is given to student perceptions of their experiences at university and the factors leading to progressive disengagement and drop out. The empirical material analysed shows that, although access to university is relatively easy within the Italian context, hurdles to the pursuit of a university education are largely hidden. Students who withdraw are those who are unable to embody the codes, rules and functioning of higher education: those who do not manage to internalise the type of disciplined autonomy needed for responding to academic demands. Personal characteristics and background resources are key for enabling students to fit in the academic environment. The ways in which higher education institutions regulate access and structure university life contribute to drop out processes and unequal pathways based on the social background of students. Following Coulon, we conclude by arguing that higher education institutions should develop systemic approaches that commit their structure and personnel to the goal of developing a “pedagogy of affiliation” aimed at fostering—particularly among students from underprivileged backgrounds—the cognitive, social and practical skills needed to prosper in higher education.  相似文献   

The myplace4u Platform Project: A Tool for Place Branding and the Promotion of Literature     

Christine Evain  Chris De Marco 《Publishing Research Quarterly》2016,32(2):103-112

An expansion of the eZoomBook (eZB) platform, the ‘myplace4u’ project was designed for place branding and the promotion of literature by linking texts to places—geographical, historical, and touristic places visited physically or imaginatively. The platform allows contributors to collaboratively create and share multi-level books called “eZoomBooks” or digital enriched versions of the original version, organized according to tabs linked to place names in the original. A zooming function enables readers of the eZoomBooks on the platform to navigate freely between the original and enriched versions. Teacher-directed collaboration activities expand the applications of the eZB platform and myplace4u extension.  相似文献   

Developing schools as learning organisations—“Why” and “how”?     

Marco Kools  Bert George  Bram Steijn 《European Journal of Education》2020,55(1):3-8

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A microfluidic platform for controlled biochemical stimulation of twin neuronal networks     

Biffi E  Piraino F  Pedrocchi A  Fiore GB  Ferrigno G  Redaelli A  Menegon A  Rasponi M 《Biomicrofluidics》2012,6(2):24106-2410610

Spatially and temporally resolved delivery of soluble factors is a key feature for pharmacological applications. In this framework, microfluidics coupled to multisite electrophysiology offers great advantages in neuropharmacology and toxicology. In this work, a microfluidic device for biochemical stimulation of neuronal networks was developed. A micro-chamber for cell culturing, previously developed and tested for long term neuronal growth by our group, was provided with a thin wall, which partially divided the cell culture region in two sub-compartments. The device was reversibly coupled to a flat micro electrode array and used to culture primary neurons in the same microenvironment. We demonstrated that the two fluidically connected compartments were able to originate two parallel neuronal networks with similar electrophysiological activity but functionally independent. Furthermore, the device allowed to connect the outlet port to a syringe pump and to transform the static culture chamber in a perfused one. At 14 days invitro, sub-networks were independently stimulated with a test molecule, tetrodotoxin, a neurotoxin known to block action potentials, by means of continuous delivery. Electrical activity recordings proved the ability of the device configuration to selectively stimulate each neuronal network individually. The proposed microfluidic approach represents an innovative methodology to perform biological, pharmacological, and electrophysiological experiments on neuronal networks. Indeed, it allows for controlled delivery of substances to cells, and it overcomes the limitations due to standard drug stimulation techniques. Finally, the twin network configuration reduces biological variability, which has important outcomes on pharmacological and drug screening.  相似文献   

Polyester μ-assay chip for stem cell studies     

Francesco Piraino  ?eila Selimovi?  Marco Adamo  Alessandro Pero  Sam Manoucheri  Sang Bok Kim  Danilo Demarchi  Ali Khademhosseini 《Biomicrofluidics》2012,6(4)

The application of microfluidic technologies to stem cell research is of great interest to biologists and bioengineers. This is chiefly due to the intricate ability to control the cellular environment, the reduction of reagent volume, experimentation time and cost, and the high-throughput screening capabilities of microscale devices. Despite this importance, a simple-to-use microfluidic platform for studying the effects of growth factors on stem cell differentiation has not yet emerged. With this consideration, we have designed and characterized a microfluidic device that is easy to fabricate and operate, yet contains several functional elements. Our device is a simple polyester-based microfluidic chip capable of simultaneously screening multiple independent stem cell culture conditions. Generated by laser ablation and stacking of multiple layers of polyester film, this device integrates a 10 × 10 microwell array for cell culture with a continuous perfusion system and a non-linear concentration gradient generator. We performed numerical calculations to predict the gradient formation and calculate the shear stress acting on the cells inside the device. The device operation was validated by culturing murine embryonic stem cells inside the microwells for 5 days. Furthermore, we showed the ability to maintain the pluripotency of stem cell aggregates in response to concentrations of leukemia inhibitory factor ranging from 0 to ∼1000 U/ml. Given its simplicity, fast manufacturing method, scalability, and the cell-compatible nature of the device, it may be a useful platform for long-term stem cell culture and studies.  相似文献   

Structural assessment and measurement of the elastic deformation of historical violins: The case study of the Guarneri ‘del Gesù’ violin (1743) known as the ‘Cannone’     

Marco Fioravanti  Giacomo Goli  Bruce Carlson 《Journal of Cultural Heritage》2012,13(2):145-153

This paper presents a deformative and structural study of the Guarneri ‘del Gesù’ violin (1743) known as the ‘Cannone’. A structural assessment is fundamental to understanding the violin's compatibility with its residual function of musical instrument. The tuning of the instrument to a modern playing pitch during concerts could, in fact, cause stress resulting in plastic deformations of its structure. In order to understand the stress level to which the violin is subjected when tuned, several tests were performed. The forces acting on the bridge were measured, the geometry of the un-strung and of the tuned violin were acquired with a tri-dimensional scanner, the violin deformation was assessed by means of the computed surface deviation mesh and by measuring the deformation in selected lines, several sections of the violin were cut from the digital model and stress exerted on the sections was computed. The stress exerted on the neck, scroll and body were found to be very limited. More significant, albeit at a low level, was the stress exerted under the bridge between the sound holes. Mechanical stress exerted after tuning was found to be safe for the violin, if applied for a limited amount of time. This does not mean that the violin can be played freely, because the real strength of the material used in the violin is not known and mechanical stress during a concert must be added to time (viscous behaviour), moisture content variation (mechano-sorptive behaviour) and hygro-thermal stress, thus worsening the condition. The method presented here could be applied to compute the level of stress of any violin.  相似文献   

Sports participation,physical activity,and health in the European regions     

Fernando Lera-López  Rocio Marco 《Journal of sports sciences》2018,36(15):1784-1791

In a context of stagnation of the level of health-enhancing physical activity in Europe, this study examines the geographical stratification of sports participation and physical activity (PA) at the regional level in 28 European countries. While previous research has focused on the national approach, this study considers the regional level across 208 European regions. Individual survey data from the Eurobarometer 80.2 is combined with a regional-level approach to the 208 regions to quantify sports participation and PA at the regional level. The results show important differences and a geographical stratification of sports participation and PA among the European regions, albeit following different patterns. In particular, a north–south gap is identified in terms of PA rates and an east–west gap is detected in terms of sports participation levels. Applying the cluster technique, a taxonomy of four different European regions is developed considering both types of indicators. Finally, the existence of sports spatial spillovers among regions is verified, obtaining a positive autocorrelation among neighbouring regions for being involved in PA and sporting activities. The results may have significant implications in terms of policy measures to improve health through PA and sports participation at the regional level in Europe.  相似文献   

Is panpsychism with us?     

Giunti  Marco 《Metascience》2017,26(1):117-121

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