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When sight was added to sound, the problems of presenting the news of the day multiplied, as did the cost of such coverage. Nevertheless, few news directors are satisfied with the strict “man‐on‐camera” approach; they prefer to use the additional information channel for a certain amount of visual augmentation of the audio channel's content. Beacuse television stations in a given market rarely have a chance to examine the output of stations in other markets, the survey reported in the following article was made'. Both the sources of visual news materials and their uses are studied in a sample of midwestern stations. It is interesting to examine this report after a review of William Hazard's study for the Radio‐Television News Directors Association, “Adequacy of Coverage by Still Picture and Film Services” published in the Journal of Broadcasting, Vol. IV, No. 1, pp. 64–76, Winter, 1959–60. 相似文献
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U.S. advocacy for increased international intellectual property protection and a free and open Internet has been criticized as being inconsistent at best and hypocritical at worst. Placing U.S. copyright and Internet policy in a historical context and using Susan Strange's concepts of structural power and knowledge structures, we argue that copyright and Internet policies cannot be analyzed in isolation, but are intimately and inextricably linked forms of knowledge regulation. All knowledge regulation policies involve balancing access and restriction. Our analysis suggests that the current U.S. policy of Internet freedom and strong copyright protection represents a particular, historically situated strategy designed to exert structural power in the global information economy: Free flow of information creates markets by exposure to intellectual properties, while copyright secures economic benefit to copyright holders from the flow. We argue that a full and honest debate over issues of information access requires acknowledgment of contemporary and conflicting values, with the realization that different societies and interests will weigh access and dissemination differently. Recognizing as legitimate and incorporating these different perspectives into the global governance structures of the Internet comprise the key challenge facing those who favor truly democratic global Internet governance. 相似文献
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Running on a treadmill is an activity that is novel to many people. Thus, a familiarisation period may be required before reliable and valid determinations of biomechanical parameters can be made. The current study investigated the time required for treadmill familiarisation under barefoot and shod running conditions. Twenty-six healthy men, who were inexperienced in treadmill running, were randomly allocated to run barefoot or shod for 20 minutes on a treadmill at a self-selected comfortable pace. Sagittal-plane kinematics for the ankle, knee and hip, and ground reaction force and spatio-temporal data were collected at two-minute intervals. For the barefoot condition, temporal differences were observed in peak hip flexion and peak knee flexion during swing. For the shod condition, temporal differences were observed for peak vertical ground reaction force. No temporal differences were observed after 8 minutes for either condition. Reliability analysis revealed high levels of consistency (ICC > 0.90) across all consecutive time-points for all dependent variables for both conditions after 8 minutes with the exception of maximal initial vertical ground reaction force loading rate. Participants in both barefoot and shod groups were therefore considered familiarised to treadmill running after 8 minutes. 相似文献
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