Science Letters：Visual odometry for road vehicles —— feasibility analysis

Estimating the global position of a road vehicle without using GPS is a challenge that many scientists look forward to solving in the near future. Normally, inertial and odometry sensors are used to complement GPS measures in an attempt to provide a means for maintaining vehicle odometry during GPS outage. Nonetheless, recent experiments have demonstrated that computer vision can also be used as a valuable source to provide what can be denoted as visual odometry. For this purpose, vehicle motion can be estimated using a non-linear, photogrametric approach based on RAndom SAmple Consensus (RANSAC). The results prove that the detection and selection of relevant feature points is a crucial factor in the global performance of the visual odometry algorithm. The key issues for further improvement are discussed in this letter.     

Father-child and mother-child speech: A perspective on parental roles

An analysis of the existing research on parents' speech to young children suggests that the differences between mothers' and fathers' speech appear especially in the nature of their vocabulary and in certain functional and conversational aspects of their speech when addressing their children. The findings suggest that the father is a more demanding or challenging conversational partner for the young child than the mother, who tends to be more sensitive to the child's abilities and requires less of the child as a conversational partner. We interpret these differences as reflecting parental roles which are in part different and complementary. The mother's specific role is to provide a feeling of security by avoiding situations where the child's established acquisitions would be challenged, while still stimulating the child. The father's specific roles is to prompt the child to attain higher levels of success, even if it means momentarily destabilizing the child. Literature on children's communicative behaviors with each parent was also examined. The sparse amount of research in this field reveals that children may communicate differently with mothers and fathers. The conclusions of this literature review are discussed in terms of different perspectives open for future research.     

Beyond Circulation: The Evolution of Access Services and Its Relationship to Reference Librarianship

Academic libraries have undergone a variety of organizational changes in the last two decades. One area that has evolved out of these changes is access services. Relationships between circulation, interlibrary loan, and reference have been explored though informal and formal organizational structures. Because of these types of interactions it is feasible for reference librarians to consider positions in access services.     

Influence of gender on ventilatory efficiency during exercise in young children

In this study, we assessed the ventilatory response in 84 children (46 males: age 8.1 +/- 1.0 years, body mass 34.2 +/- 7.9 kg, height 1.32 +/- 0.16 m; 38 females: age 8.0 +/- 0.8 years, body mass 31.7 +/- 8.7 kg, height 1.31 +/- 0.08 m) during a cycle ergometer test to determine if there was an influence of gender on ventilatory efficiency. The test commenced at 25 W and increased by 10 W every minute. Expired air was collected through a face mask and analysed breath by breath. The ventilatory anaerobic threshold was determined according to gas exchange methods and we focused our attention on the analysis of carbon dioxide production (VCO(2)), ventilation (V(E)), the ratio V(E)/VCO(2) and its slope. Differences between the sexes at maximal power output were strongly significant for V(E) and VCO(2) (P = 0.0001 and P = 0.0004 respectively) and moderately significant for the V(E)/VCO(2) ratio (P = 0.05). The slope of V(E) versus VCO(2) was 30.8 +/- 4.2 for males and 29.4 +/- 3.2 for females, with no difference between the sexes (P = 0.1). In conclusion, although the peak values of V(E) and VCO(2) were significantly different between the sexes, there were no such differences in ventilatory efficiency during a maximal incremental test expressed as the slope of V(E)/VCO(2), at least in young children.     

On the benefits of bi-literacy: just a head start in reading or specific orthographic insights?

In a previous study [Schwartz et al. (2005). Written Language and Literacy, 8, 179–207] we showed that early literacy in Russian (L1) facilitated decoding acquisition in Hebrew (L2) among Russian-Hebrew first graders. The present study examined two alternative explanations for this finding. The first account concerns the general benefits of an early start in literacy. The second relates to the specific meta-linguistic insights engendered by early exposure to a fully fledged orthography—Russian. We therefore compared two groups who had acquired literacy prior to the onset of schooling: bi-literate bilinguals (Russian L1 literates and Hebrew L2 learners) (n = 26) and early-literacy monolinguals (Hebrew-speaking monolinguals) (n = 18). The research was conducted in two stages. First, linguistic, meta-linguistic and cognitive tasks in Hebrew were administered to all children and in Russian to the bilinguals at the beginning of the first grade. Next, reading and writing skills in Hebrew were assessed at the end of the first grade. Bi-literate bilinguals showed superior levels of phonological awareness on an initial phoneme isolation task in Hebrew compared to other three groups. In addition, the bi-literate bilinguals were found to be superior to the early-literacy monolinguals on measures of word and pseudoword accuracy, which are known to depend heavily on phonological processing efficiency, but not on fluency and spelling measures, which are more reliant on stored orthographic information. This pattern of outcomes was attributed to the facilitating effects of an orthography characterized by a fully fledged alphabet, in contrast to Hebrew’s primarily consonantal orthography, as well as the complex syllabic structure of Russian.