Use of mobile devices to answer online surveys: implications for research.

BACKGROUND: There is a growing use of mobile devices to access the Internet. We examined whether participants who used a mobile device to access a brief online survey were quicker to respond to the survey but also, less likely to complete it than participants using a traditional web browser. FINDINGS: Using data from a recently completed online intervention trial, we found that participants using mobile devices were quicker to access the survey but less likely to complete it compared to participants using a traditional web browser. More concerning, mobile device users were also less likely to respond to a request to complete a six week follow-up survey compared to those using traditional web browsers. CONCLUSIONS: With roughly a third of participants using mobile devices to answer an online survey in this study, the impact of mobile device usage on survey completion rates is a concern. TRIAL REGISTRATION: ClinicalTrials.gov: NCT01521078.

Spectral efficiency in reference-signal-assisted low-power wireless communication

Expressions relating spectral efficiency, power and Doppler spectrum are derived for low-power Rayleighfaded wireless channels with proper complex signaling. Noside information on the state of the channel is assumed at the receiver. Rather, periodic reference signals are postulated inaccordance with the functioning of most wireless systems. In contrast with most previous studies, which relied on block-fading channel models, a continuous-fading model is adopted. This embeds the Doppler spectrum directly in thederived expressions thereby imbuing them with practical significance.

Optimum pilot overhead in wireless communication: a unified treatment of continuous and block-fading channels

The optimization of the pilot overhead in wireless fading channels is investigated, and the dependence of this overhead on various system parameters of interest (e.g., fading rate, signal-to-noise ratio) is quantified. The achievable pilot-based spectral efficiency is expanded with respect to the fading rate about the no-fading point, which leads to an accurate order expansion for the pilot overhead. This expansion identifies that the pilot overhead, as well as the spectral efficiency penalty with respect to a reference system with genie-aided CSI (channel state information) at the receiver, depend on the square root of the normalized Doppler frequency. It is also shown that the widely-usedblock fading model is a special case of more accurate continuous fading models in terms of the achievable pilot-based spectral efficiency. Furthermore, it is established that the overhead optimization for multiantenna systems is effectively the same as for single-antenna systems with thenormalized Doppler frequency multiplied by the number of transmit antennas.

The effect of femoral component rotation on the five-year outcome of cemented mobile bearing total knee arthroplasty.

PURPOSE: Performing total knee replacement, accurate alignment and neutral rotation of the femoral component are widely believed to be crucial for the ultimate success. Contrary to absolute bone referenced alignment, using a ligament balancing technique does not automatically rotate the femoral component parallel to the transepicondylar axis. In this context we established the hypothesis that rotational alignment of the femoral component parallel to the transepicondylar axis (0° ± 3°) results in better outcome than alignment outside of this range. METHODS: We analysed 204 primary cemented mobile bearing total knee replacements five years postoperatively. Femoral component rotation was measured on axial radiographs using the condylar twist angle (CTA). Knee society score, range of motion as well as subjective rating documented outcome. RESULTS: In 96 knees the femoral component rotation was within the range 0 ± 3° (neutral rotation group), and in 108 knees the five-year postoperative rotational alignment of the femoral component was outside of this range (outlier group). Postoperative CTA showed a mean of 2.8° (±3.4°) internal rotation (IR) with a range between 6° external rotation (ER) and 15° IR (CI 95). No difference with regard to subjective and objective outcome could be detected. CONCLUSION: The present work shows that there is a large given natural variability in optimal rotational orientation, in this study between 6° ER and 15° IR, with numerous co-factors determining correct positioning of the femoral component. Further studies substantiating pre- and postoperative determinants are required to complete the understanding of resulting biomechanics in primary TKA.

Carte routière du département de la Dordogne : comprenant les routes royales, les routes départementales les chemins vicinaux de grande communication classés par le Conseil général / Dressée par A. Bardon Géog[rap]he des Ponts et Ch[aus]sées

Échelle(s) : [ca 1:200 000], échelle de 0,01 pour 2000 mètres

La communication intersubjective du bébé dans le triangle primaire

L'étude de la communication à trois entre le bébé, le père et la mère au travers du jeu du trilogue lausannois montre que la communication intersubjective dans la famille suit la même trajectoire développementale que la communication intersubjective à deux entre le bébé et sa mère ou son père : d'une forme primaire ou directe, elle évolue vers une forme secondaire ou référentielle, pour intégrer ensuite des formes symbolique et morale et enfin narrative.

QuesTInSitu mobile: aplicació per a rutes de preguntes geolocalitzades

En plena era de la informació, les noves tecnologies s’han posat també al servei del’ensenyament. Per tal de proveir a l’estudiant dels mètodes més útils i eficients per donar suport al seu aprenentatge, han sorgit eines cada cop més acurades amb la intenció de proveird’una manera robusta tot allò que fins fa poc només es podia fer a les aules. Així va néixer el concepte d’e-learning.QuesTInSitu és una eina concebuda dins d’aquesta àrea que permet crear preguntesgeolocalitzades sobre mapes de GoogleMaps i organitzar-les com a rutes (qüestionaris), sobre el mapa que es desitgi del món. Aquest projecte ofereix la possibilitat de poder realitzar físicament l’activitat creada per QuesTInSitu mitjançant terminals mòbils amb connexió 3G i GPS. Per això, s’ha dissenyat un portal web adaptat, QuesTInSitu mobile, que permet realitzar les gimcanes geolocalitzades dissenyades prèviament. Malgrat aquest projecte està contingut enl’àrea del e-learning, ofereix un llarg ventall de possibilitats d’ús; publicitat o turisme en són alguns exemples.

Communication, Coordination, and Efficiency in Evolutionary One-population Models

We analyze the role of commitment in pre-play communication for ensuring efficient evolutionarily stable outcomes in coordination games. All players are a priori identical as they are drawn from the same population. In games where efficient outcomes can be reached by players coordinating on the same action we find commitment to be necessary to enforce efficiency. In games where efficienct outcomes only result from play of different actions, communication without commitment is most effective although efficiency can no longer be guaranteed. Only when there are many messages then inefficient outcomes are negligible as their basins of attraction become very small.

Tradução e validação da escala Partner Communication Scale – versão brasileira com adolescentes do sexo feminino

O objetivo do estudo é descrever o processo de adaptação e validação da escala Partner Communication Scale -PCS com adolescentes do sexo feminino em Fortaleza, CE. Pesquisa metodológica, de abordagem quantitativa, realizada com 313 adolescentes, entre 14 a 18 anos, que já haviam tido o primeiro intercurso sexual. O processo de adaptação transcultural seguiu as etapas: tradução, retrotradução, avaliação das traduções por um comitê de juízes e teste da versão pré-final. A escala foi aplicada com um questionário sociodemográfico e de variáveis sexuais e reprodutivas, via computador, em novembro/2010 a janeiro/2011. A confiabilidade foi verificada por meio do teste alfa de Cronbach (0.86) e demonstrou que pode ser aplicada no cenário da atenção primária à saúde, durante as consultas de enfermagem ao adolescente, e que permite identificar fatores que dificultam/facilitam a comunicação, principalmente em relação às DST/HIV. A escala mostrou-se adequada para verificar a comunicação entre os parceiros sexuais na adolescência.

Communication Strategies Of The Nursing Team In The Aphasia After Cerebrovascular Accident

This is an exploratory, cross-sectional study of quantitative design that aimed to identify the communication strategies used and reported by the nursing staff in the care of aphasic patients after a stroke. The techniques used were the participant observation and interviews with 27 subjects of the nursing staff of neurological units in a general hospital. The most frequently mentioned strategies were gestures (100%), verbal communication (33.3%), written communication (29.6%) and the touch (18.5 %). Among the observed strategies, the gestures reached 40.7% and the touch was present in all situations, given its instrumental character essential to care. The findings show lack of knowledge of nonverbal, proxemics , kinesics and tacesics communication. No significant differences were observed among the professional categories depending on the length of experience with respect to the strategies reported by members of the nursing staff in the care for aphasic patients.