Filtering by
- Creators: Paz, Ricardo
- Creators: Arizona State University
videos is to record live lectures, but these videos end up being lengthy, include long
pauses and repetitive words making the viewing experience time consuming. While
pauses are useful in live learning environments where students take notes, I question
the value of pauses in video lectures. Techniques and algorithms that can shorten such
videos can have a huge impact in saving students’ time and reducing storage space.
I study this problem of shortening videos by removing long pauses and adaptively
modifying the playback rate by emphasizing the most important sections of the video
and its effect on the student community. The playback rate is designed in such a
way to play uneventful sections faster and significant sections slower. Important and
unimportant sections of a video are identified using textual analysis. I use an existing
speech-to-text algorithm to extract the transcript and apply latent semantic analysis
and standard information retrieval techniques to identify the relevant segments of
the video. I compute relevance scores of different segments and propose a variable
playback rate for each of these segments. The aim is to reduce the amount of time
students spend on passive learning while watching videos without harming their ability
to follow the lecture. I validate the approach by conducting a user study among
computer science students and measuring their engagement. The results indicate
no significant difference in their engagement when this method is compared to the
original unedited video.
Jaime Mendoza-Nava (1925-2005) was an important Bolivian composer. In addition to writing music for the concert stage, he worked as a composer of film music in Los Angeles during the second half of the twentieth century. His life and work remain greatly unstudied, with the majority of his compositions existing only in manuscript form. The present study surveys the available biographical information on the composer and supplements it with new data collected through interviews with the composer’s family. The information presented here focuses on the composer’s American period as well as his personality traits. The study also examines the development of musical nationalism in Bolivia and other important aspects of Bolivian culture and society, thus creating a historical context through which key influences on the composer are identified. This historical and cultural information also contributes to an examination of Mendoza-Nava’s song cycle País de sombra (1988). A close study of this work reveals Mendoza-Nava’s sensitive setting of the poetry of Ricardo Jaimes Freyre (1868-1933) and his musical references to his Bolivian heritage. A recording of the song cycle by soprano Andrea Ramos and the current author and an edited copy of the musical score conclude the study.
