- About
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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 6 of 6 (0.071 seconds)| 1 |
Der Mehrwert von Vorlesungsaufzeichnungen als Ergänzungsangebot zur PräsenzlehreRust, Ina, Krüger, Marc 25 October 2011 (has links) (PDF)
In diesem Artikel wird der Frage nachgegangen, was der Mehrwert von Vorlesungsaufzeichnungen als Ergänzungsangebot zur Präsenzlehre ist. Die Beantwortung dieser Frage wird auf Basis der Befunde einer dreiteiligen Evaluation vorgenommen, welche eine Befragung der Lehrenden und Studierenden sowie eine Logfile-Analyse umfasst.
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Fast presenter tracking for 4K lecture videos using computationally inexpensive algorithmsFitzhenry, Charles 10 June 2023 (has links) (PDF)
Lecture recording has become an essential tool for educational institutions to enhance the student learning experience and offer online courses for remote learning programs. Highresolution 4K cameras have gained popularity in these systems due to their affordability and clarity of written content on boards/screens. Unfortunately, at 4K resolution, a typical 45- minute lecture video easily exceeds 2GB. Many video files of this size place a financial burden on institutions and students, especially in developing countries where financial resources are limited. Institutions require costly high-end equipment to capture, store and distribute this ever-increasing collection of videos. Students require a fast internet connection with a large data quota for off-campus viewing, which can be too expensive for many, especially if they use mobile data. This project designs and implements a low-cost presenter and writing detection front-end that can integrate with an external Virtual Cinematographer (VC). Gesture detection was also explored; however, the frame differencing approach used for presenter detection was not sufficiently robust for gesture detection. Our front-end is carefully designed to run on commodity computers without requiring expensive Graphics Processing Units (GPU) or servers. An external VC can use our contextual information to segment a smaller cropping window from the 4K frame, only containing the presenter and relevant boards, drastically reducing the file size of the resultant videos while preserving writing clarity. The software developed as part of this project will be available as open source. Our results show that the front-end module is fit for purpose and sufficiently robust across several challenging lecture venue types. On average, a 2-minute video clip is processed by the front-end in under 60 seconds (or approximately half of the input video duration). The majority (89%) of this time is used for reading and decoding frames from storage. Additionally, our low-cost presenter detection achieves an overall F1-Score of 0.76, while our writing detection achieves an overall F1-Score of 0.55. We also demonstrate a mean reduction of 81.3% in file size from the original 4K video to a cropped 720p video when using our front-end in a full pipeline with an external VC.
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Evaluating Student Use Patterns of Streaming Video Lecture Capture in a Large Undergraduate ClassroomWhitley-Grassi, Nathan E. 01 January 2017 (has links)
Large classes that allow smaller amounts of instructor-student interaction have become more common in today's colleges. The best way to provide needed opportunities for students to overcome this lack of interaction with instructors remains unidentified. This research evaluated the use of video lecture capture (VLC) as a supplemental method for teacher-student interaction and what, if any, impact it and attendance have on student performance in large lecture courses. This ex post facto study conducted at a Northeastern research university utilized cognitive and andragogical frameworks to examine the relationships between the independent variables frequency of video viewing, quantity of videos viewed, and course attendance, as well as their impact on course performance in a large lecture course (N=329). Data sources included archival data from the learning management system and student survey responses. Analysis included a series of two-way ANOVA tests. The results indicated that the frequency of video viewing was found to have a significant positive effect on course performance (F = 3.018, p = .030). The number of VLC videos not viewed was also found to have a significant negative effect on course performance (F = 1.875, p = 0.016). Other independent variables were not found to have any significant main effect or interaction effect with the dependent variable, course performance. Findings from this research may be used by educators, students, and administrators planning course sizes and availability to better understand the relationship between these variables and how VLC can be used effectively in large lecture classes thus leading to improved efficacy in VLC use.
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Der Mehrwert von Vorlesungsaufzeichnungen als Ergänzungsangebot zur PräsenzlehreRust, Ina, Krüger, Marc 25 October 2011 (has links)
In diesem Artikel wird der Frage nachgegangen, was der Mehrwert von Vorlesungsaufzeichnungen als Ergänzungsangebot zur Präsenzlehre ist. Die Beantwortung dieser Frage wird auf Basis der Befunde einer dreiteiligen Evaluation vorgenommen, welche eine Befragung der Lehrenden und Studierenden sowie eine Logfile-Analyse umfasst.
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Hypermediale Navigation in Vorlesungsaufzeichnungen: Nutzung und automatische Produktion hypermedial navigierbarer Aufzeichnungen von LehrveranstaltungenMertens, Robert 08 November 2007 (has links)
In the mid nineties, electronic lecture recording has emerged as a new area of research. The aim behind most early research activities in this field has been the cost-efficient production of e-learning content as a by-product of traditional lectures. These efforts have led to the development of systems that can produce recordings of a lecture in a fraction of the time and also for a fraction of the cost that other methods require for the production of similar e-learning content.While the production of lecture recordings has been investigated thoroughly, the conditions under which the content produced can be used efficiently shifted into focus of research only recently. Employing lecture recordings in the right way is, however, crucial for the effectiveness with which they can be used. Therefore this thesis gives a detailed overview of archetypical application scenarios. A closer examination of these scenarios reveals the importance of navigation in recorded lectures as a critical factor for teaching and learning success. In order to improve navigation, a hypermedia navigation concept for recorded lectures is developed. Hypermedia navigation has proven a successful navigation paradigm in classic text- and picture-based media. In order to be adapted for time based media such as recorded lectures, a number of conceptual changes have to be applied. In this thesis, a hypermedia navigation concept is developed that tackles this problem by combining time- and structure-based navigation paradigms and by modifying existing hypermedia navigation facilities.Even a highly developed navigation concept for recorded lectures can, however, not be put into practice efficiently when production costs of suitable recordings are too high. Therefore this thesis also shows that suitable lecture recordings can be produced with minimal production cost. This endeavour is realized by the implementation of a fully automatic production chain for recording and indexing lectures.
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Scalable Multimedia Learning: From local eLectures to global OpencastKetterl, Markus 27 March 2014 (has links)
Universities want to go where the learners are to share their rich scientific and intellectual knowledge beyond the walls of the academy and to expand the boundaries of the classroom. This desire has become a critical need, as the worldwide economy adjusts to globalization and the need for advanced education and training becomes ever more critical. Unfortunately, the work of creating, processing, distributing and using quality multimedia learning content is expensive and technically challenging. The work combines research results, lessons learned and usage findings in the presentation of a fully open source based scalable lecture capture solution, that is useful in the heterogenous computing landscape of today’s universities and learning institutes. Especially implemented user facing applications and components are being addressed, which enable lecturers, faculty and students to record, analyze and subsequently re-use the recorded multimedia learning material in multiple and attractive ways across devices and distribution platforms.
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