190,068 research outputs found
The Use of a Cap-mounted Tri-axial Accelerometer for Measurement of Distance, Lap Times and Stroke Rates in Swim Training
This paper will report some of the findings from a trial which recorded accelerometer data from six elite level swimmers (three female and three male, varying primary event stroke and distance) over the course of a regular 15 week training block. Measurements from a head-mounted accelerometer are used to determine when the athlete is swimming, marking of turning points (and therefore distance and lap-time measurements), and is processed by frequency analysis to determine stroke-rate. Comparison with video where available, and with training plans and literature where not, have proven this method to be accurate and reliable for determining these performance metrics. The primary objective of this project was to develop a low-cost, simple and highly usable system for use in swim coaching, feedback from elite coaches has indicated that development of this could be an extremely useful addition to their training regime
Improving Knowledge-Based Systems with statistical techniques, text mining, and neural networks for non-technical loss detection
Currently, power distribution companies have several problems that are related to energy losses. For
example, the energy used might not be billed due to illegal manipulation or a breakdown in the customer’s
measurement equipment. These types of losses are called non-technical losses (NTLs), and these
losses are usually greater than the losses that are due to the distribution infrastructure (technical losses).
Traditionally, a large number of studies have used data mining to detect NTLs, but to the best of our
knowledge, there are no studies that involve the use of a Knowledge-Based System (KBS) that is created
based on the knowledge and expertise of the inspectors. In the present study, a KBS was built that is
based on the knowledge and expertise of the inspectors and that uses text mining, neural networks,
and statistical techniques for the detection of NTLs. Text mining, neural networks, and statistical techniques
were used to extract information from samples, and this information was translated into rules,
which were joined to the rules that were generated by the knowledge of the inspectors. This system
was tested with real samples that were extracted from Endesa databases. Endesa is one of the most
important distribution companies in Spain, and it plays an important role in international markets in
both Europe and South America, having more than 73 million customers
Using Noninvasive Brain Measurement to Explore the Psychological Effects of Computer Malfunctions on Users during Human-Computer Interactions
In today’s technologically driven world, there is a need to better understand the ways that common computer malfunctions affect computer users. These malfunctions may have measurable influences on computer user’s cognitive, emotional, and behavioral responses. An experiment was conducted where participants conducted a series of web search tasks while wearing functional nearinfrared spectroscopy (fNIRS) and galvanic skin response sensors. Two computer malfunctions were introduced during the sessions which had the potential to influence correlates of user trust and suspicion. Surveys were given after each session to measure user’s perceived emotional state, cognitive load, and perceived trust. Results suggest that fNIRS can be used to measure the different cognitive and emotional responses associated with computer malfunctions. These cognitive and emotional changes were correlated with users’ self-report levels of suspicion and trust, and they in turn suggest future work that further explores the capability of fNIRS for the measurement of user experience during human-computer interactions
Teacher Evaluator Training & Certification: Lessons Learned From the Measures of Effective Teaching Project
Makes recommendations for the design and implementation of programs to train and certify principals in conducting teacher evaluations, including content, format, and length of training, scoring practice, and criteria for certification tests
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Practitioner-based measurement: a collaborative software measurement approach
Occupational therapists’ views of using a virtual reality interior design application within the pre-discharge home visit process
This article has been made available through the Brunel Open Access Publishing Fund.Background: A key role of Occupational Therapists (OTs) is to carry out pre-discharge home visits (PHV) and propose appropriate adaptations to the home environment, to enable patients to function independently after hospital-home discharge. However, research shows that more than 50% of specialist equipment installed as part of home adaptations is not used by patients. A key reason for this is that decisions about home adaptations are often made without adequate collaboration and consultation with the patient. Consequently, there is an urgent need to seek out new and innovative uses of technology to facilitate patient/practitioner collaboration, engagement and shared decision making in the PHV process. Virtual reality interior design applications (VRIDAs) primarily allow users to simulate the home environment and visualise changes prior to implementing them. Customised VRIDAs, which also model specialist occupational therapy equipment, could become a valuable tool to facilitate improved patient/practitioner collaboration if developed effectively and integrated into the PHV process. Objective: To explore the perceptions of occupational therapists with regards to using VRIDAs as an assistive tool within the PHV process. Methods: Task-oriented interactive usability sessions, utilising the think-aloud protocol and subsequent semi-structured interviews were carried out with seven Occupational Therapists who possessed significant experience across a range of clinical settings. Template analysis was carried out on the think-aloud and interview data. Analysis was both inductive and driven by theory, centring around the parameters that impact upon the acceptance, adoption and use of this technology in practice as indicated by the Technology Acceptance Model (TAM). Results: OTs’ perceptions were identified relating to three core themes: (1) perceived usefulness (PU), (2) perceived ease of use (PEoU), and (3) actual use (AU). Regarding PU, OTs believed VRIDAs had promising potential to increase understanding, enrich communications and patient involvement, and improved patient/practitioner shared understanding. However, it was unlikely that VRIDAs would be suitable for use with cognitively impaired patients. For PEoU, all OTs were able to use the software and complete the tasks successfully, however, participants noted numerous specialist equipment items that could be added to the furniture library. AU perceptions were positive regarding use of the application across a range of clinical settings including children/young adults, long-term conditions, neurology, older adults, and social services. However, some “fine tuning” may be necessary if the application is to be optimally used in practice. Conclusions: Participants perceived the use of VRIDAs in practice would enhance levels of patient/practitioner collaboration and provide a much needed mechanism via which patients are empowered to become more equal partners in decisions made about their care. Further research is needed to explore patient perceptions of VRIDAs, to make necessary customisations accordingly, and to explore deployment of the application in a collaborative patient/practitioner-based context
Is Content Publishing in BitTorrent Altruistic or Profit-Driven
BitTorrent is the most popular P2P content delivery application where
individual users share various type of content with tens of thousands of other
users. The growing popularity of BitTorrent is primarily due to the
availability of valuable content without any cost for the consumers. However,
apart from required resources, publishing (sharing) valuable (and often
copyrighted) content has serious legal implications for user who publish the
material (or publishers). This raises a question that whether (at least major)
content publishers behave in an altruistic fashion or have other incentives
such as financial. In this study, we identify the content publishers of more
than 55k torrents in 2 major BitTorrent portals and examine their behavior. We
demonstrate that a small fraction of publishers are responsible for 66% of
published content and 75% of the downloads. Our investigations reveal that
these major publishers respond to two different profiles. On one hand,
antipiracy agencies and malicious publishers publish a large amount of fake
files to protect copyrighted content and spread malware respectively. On the
other hand, content publishing in BitTorrent is largely driven by companies
with financial incentive. Therefore, if these companies lose their interest or
are unable to publish content, BitTorrent traffic/portals may disappear or at
least their associated traffic will significantly reduce
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