The Ambiguity of Subversion

This article explores subversion as a practice of resistance and draws on the example of subversive radio for illustration. Radio became an important site of power struggles in the twentieth century, often placed in the service of both resistance and oppression. An examination of subversive acts in radio broadcasting, I argue, helps shift the focus away from the myths of heroic resistance, directing attention to the uncertainties encountered by the subversive actor. To make this argument, I build on Frantz Fanon’s influential work on the resistant potential of radio and engage with literature on subversion and everyday resistance. The article illustrates the ambiguity of subversion on the case study of Radio Bantu, a broadcaster of ethnic-specific radio programmes established by the South African apartheid regime.

Bio-inspired route estimation in cognitive radio networks

Cognitive radio is a technique that was originally created for the proper use of the radio electric spectrum due its underuse. A few methods were used to predict the network traffic to determine the occupancy of the spectrum and then use the ‘holes’ between the transmissions of primary users. The goal is to guarantee a complete transmission for the second user while not interrupting the trans-mission of primary users. This study seeks the multifractal generation of traffic for a specific radio electric spectrum as well as a bio-inspired route estimation for secondary users. It uses the MFHW algorithm to generate multifractal traces and two bio-inspired algo-rithms: Ant Colony Optimization and Max Feeding to calculate the secondary user’s path. Multifractal characteristics offer a predic-tion, which is 10% lower in comparison with the original traffic values and a complete transmission for secondary users. In fact, a hybrid strategy combining both bio-inspired algorithms promise a reduction in handoff. The purpose of this research consists on deriving future investigation in the generation of multifractal traffic and a mobility spectrum using bio-inspired algorithms.

Investigation of Spoken-Language Detection and Classification in Broadcasted Audio Content

The current paper focuses on the investigation of spoken-language classification in audio broadcasting content. The approach reflects a real-word scenario, encountered in modern media/monitoring organizations, where semi-automated indexing/documentation is deployed, which could be facilitated by the proposed language detection preprocessing. Multilingual audio recordings of specific radio streams are formed into a small dataset, which is used for the adaptive classification experiments, without seeking—at this step—for a generic language recognition model. Specifically, hierarchical discrimination schemes are followed to separate voice signals before classifying the spoken languages. Supervised and unsupervised machine learning is utilized at various windowing configurations to test the validity of our hypothesis. Besides the analysis of the achieved recognition scores (partial and overall), late integration models are proposed for semi-automatically annotation of new audio recordings. Hence, data augmentation mechanisms are offered, aiming at gradually formulating a Generic Audio Language Classification Repository. This database constitutes a program-adaptive collection that, beside the self-indexing metadata mechanisms, could facilitate generic language classification models in the future, through state-of-art techniques like deep learning. This approach matches the investigatory inception of the project, which seeks for indicators that could be applied in a second step with a larger dataset and/or an already pre-trained model, with the purpose to deliver overall results.

Fate of orally administered radioactive fatty acids in the late-pregnant rat

To investigate the biodisponibility of placental transfer of fatty acids, rats pregnant for 20 days were given tracer amounts of [14C]palmitic (PA), oleic (OA), linoleic (LA), α-linolenic (LNA), or docosahexaenoic acid (DHA) orally and euthanized at 0.5, 1.0, 2.0, or 8.0 h thereafter. Maternal plasma radioactivity in lipids initially increased only to decline at later times. Most of the label appeared first as triacylglycerols (TAG); later, the proportion in phospholipids (PhL) increased. The percentage of label in placental lipids was also always highest shortly after administration and declined later; again, PhL increased with time. Fetal plasma radioactivity increased with time, with its highest value at 8.0 h after DHA or LNA administration. DHA initially appeared primarily in the nonesterified fatty acids (NEFA) and PA, OA, LA, and LNA as TAG followed by NEFA; in all cases, there was an increase in PhL at later times. Measurement of fatty acid concentrations allowed calculation of specific (radio)activities, and the ratio (fetal/maternal) of these in the plasmas gave an index of placental transfer activity, which was LNA > LA > DHA = OA > PA. It is proposed that a considerable proportion of most fatty acids transferred through the placenta are released into the fetal circulation in the form of TAG.

International Religious Radio Broadcasting: The Reactions of Local Listeners to a Global Message

ABSTRACT This paper examines the dialogue of Tanzanian radio listeners in correspondence with Adventist Word Radio (AWR). The study sought to identify the reasons expressed by listeners for corresponding with an international radio network. The study also sought to determine whether listeners expressed preferences for specific radio programs. A historical systematic methodology was used to analyze a variety of sources available from the AWR headquarters, and the Seventh-day Adventist Office of Archives and Statistics located in Silver Spring, Maryland, USA. The study utilized the Diffusion of Innovations theory (Rogers 2003) to examine how receptive the social system of Tanzania was to the religious messages presented by AWR via the medium of radio, over a 25-year period from the inception of AWR-Africa in 1983 to 2008. The findings reveal the regions from which listener correspondences originated, the radio programs popular among AWR listeners, and the reasons given for corresponding with the network. This qualitative study offers insight in the area of media effects research, and can serve as a guide for other assessments of international religious broadcasters and their impact on local listeners.