Estudio de los videopóster mediante anotaciones de vídeo como metodología para eventos científicos

Los encuentros científicos en línea motivados por la Covid19 han sido una práctica muy común recientemente. No es nueva esta modalidad, pero hoy por su crecimiento solicitan soluciones tecnológicas estables y experimentadas. En un año se ha avanzado mucho en diferentes funciones en los sistemas de videoconferencias, como también en nuevas fórmulas para presentar los trabajos científicos como son los videopóster, que utilizando tecnologías emergentes de anotaciones de vídeo permiten una mayor interacción y debate en los trabajos científicos en un evento en línea. El estudio analiza la cantidad y la calidad de las anotaciones dentro de las cuales se recogen los debates e interacciones entre los autores y los oyentes de una mesa de comunicaciones con videopóster frente a otra presencial. La evaluación de la experimentación se realiza bajo estudio descriptivo de datos cuantitativos y cualitativos, y técnicas de análisis de contenidos “Q-análisis” de las 437 anotaciones y las 238 intervenciones en los 16 videopóster de un evento en línea. Los resultados muestran el doble de participación en la modalidad de videopóster frente a las Comunicaciones presenciales, al tiempo que se enumera un número relevante de beneficios que ofrecen los videopóster para el desarrollo de eventos en línea y redes profesionales de aprendizaje. Online scientific meetings motivated by Covid19 have been a very common practice recently. This modality is not new, but today, due to its growth, it requires stable and experienced technological solutions. In one year, much progress has been made in different functions in videoconferencing systems, as well as in new formulas for presenting scientific papers, such as videoposters, which, using emerging video annotation technologies, allow greater interaction and discussion of scientific papers in an online event. The study analyzes the quantity and quality generated by discussions between authors and listeners at a videoposter presentation table versus a face-to-face one. The evaluation of the experiment is performed under a descriptive study of quantitative and qualitative data, and content analysis techniques "Q-analysis" of the 450 annotations and 355 interventions in the 16 videoposters of an online event. We found twice the production of participation in the video-poster modality compared to face-to-face communications, while listing a relevant number of benefits offered by videoposters for the development of online events and professional learning networks.

Investigation on Dewatering of a Deep Shaft in Strong Permeable Sandy Pebble Strata on the Bank of the Yellow River

This paper reports the dewatering scheme of a deep excavation in sandy pebble strata. The excavation is in high permeability strata and is close to the Yellow River, making the dewatering difficult during construction. At present, few researchers have specially studied the dewatering scheme of deep excavations in strong permeable strata near the water resource. Field pumping test was conducted before the excavation activity, and the permeability coefficient of the strata was obtained by reverse analysis. According to the characteristics of the project, the dewatering scheme of “ waterproof curtain + base grouting + pumping ” was proposed. The influence of vertical waterproof curtain and base grouting on dewatering was analyzed by numerical simulation. In the construction process, the field water table and ground settlement were measured. The results show that (1) the groundwater table versus permeability coefficient curve shows three different stages and (2) the dewatering scheme of “ waterproof curtain + base grouting + pumping ” is effective for deep excavation in strong permeable strata.