Source localization using TDOA and FDOA measurements based on semidefinite programming and reformulation linearization

The problem of source localization using time-difference-of-arrival (TDOA) and frequency-difference-of-arrival (FDOA) measurements has been widely studied. It is commonly formulated as a weighted least squares (WLS) problem with quadratic equality constraints. Due to the nonconvex nature of this formulation, it is difficult to produce a global solution. To tackle this issue, semidefinite programming (SDP) is utilized to convert the WLS problem to a convex optimization problem. However, the SDP-based methods will suffer obvious performance degradation when the noise level is high. In this paper, we devise a new localization solution using the SDP together with reformulation-linearization technique (RLT). Specifically, we firstly apply the RLT strategy to convert the WLS problem to a convex problem, and then add the SDP constraint to tighten the feasible region of the resultant formulation. Moreover, this solution is also extended for cases when there are sensor position and velocity errors. Numerical results show that our solution has significant accuracy advantages over the existing localization schemes at high noise levels.     

Control of impact loading during distracted running before and after gait retraining in runners

Gait retraining using visual biofeedback has been reported to reduce impact loading in runners. However, most of the previous studies did not adequately examine the level of motor learning after training, as the modified gait pattern was not tested in a dual-task condition. Hence, this study sought to compare the landing peak positive acceleration (PPA) and vertical loading rates during distracted running before and after gait retraining. Sixteen recreational runners underwent a two-week visual biofeedback gait retraining program for impact loading reduction, with feedback on the PPA measured at heel. In the evaluation of PPA and vertical loading rates before and after the retraining, the participants performed a cognitive and verbal counting task while running. Repeated measures ANOVA indicated a significant interaction between feedback and training on PPA (F = 4.642; P = 0.048) but not vertical loading rates (F > 1.953; P > 0.067). Pairwise comparisons indicated a significantly lower PPA and vertical loading rates after gait retraining (P < 0.007; Cohen’s d > 0.68). Visual feedback after gait retraining reduced PPA and vertical loading rates during distracted running (P < 0.033; Cohen’s d > 0.36). Gait retraining is effective in lowering impact loading even when the runners are distracted. In dual-task situation, visual biofeedback provided beneficial influence on kinetics control after gait retraining.     

Integrating media education into liberal studies: a positive response to curriculum reform in Hong Kong

Media education has been around for quite some time in the West (Bazalgette et al. 1990 Bazalgette, C., Bevort, E. and Savino, J. 1990. New directions: Media education worldwide, London: BFI.  [Google Scholar]), but it only started to gain acceptance in Asia (Cheung 2005 Cheung, C. K. 2005. Media education in Hong Kong: From civic education to curriculum reform. The Asia-Pacific Education Researcher, 14(1): 27–45.  [Google Scholar]), particularly in Hong Kong, in the last decade. Recently, it has been gaining more attention in Hong Kong thanks to the curriculum reform in which liberal studies will become one of the four core subjects to be taken by students in the New Senior Secondary Curriculum and media is one of the six themes to be studied in the subject of liberal studies. This article argues for the need for teaching media education in liberal studies and shows the many connections between the two subjects that facilitate this integration.     

Involving parents in paired reading with preschoolers: Results from a randomized controlled trial

A paired reading program was implemented for 195 Hong Kong preschoolers (mean age = 4.7 years) and their parents from families with a wide range of family income. The preschoolers were randomly assigned to experimental or waitlist control groups. The parents in the experimental group received 12 sessions of school-based training on paired reading in 7 weeks. They were required to do paired reading with their children for at least four times in each of these 7 weeks. At the end of the program, the preschoolers in the experimental group had better performance in word recognition and reading fluency than their counterparts in the control group. They were also reported as more competent and motivated in reading by their parents. More importantly, the program had many favorable effects on parents. Parents in the experimental group had higher self-efficacy in helping their children to be better readers and learners. They also reported that they had better relationships with their children. Their changes in relationships and self-efficacy were found to mediate the program impact on some of the child outcomes. However, family income did not moderate the effectiveness of the program. Families with high and low income both benefited from the program alike.     

Hong Kong Student Teachers' Personal Construction Of Teaching Efficacy

This study employed the repertory grid technique to investigate how a sample of 27 student teachers in Hong Kong developed a personal sense of teaching efficacy. The analysis indicated that the third year students' perceptions were more homogenous than were those of the first year students. The results also indicated that teaching efficacy was viewed in terms of the dimensions of concern for instructional participation and learning needs of pupils, communication and relationships with pupils, academic knowledge and teaching skills, lesson preparation, management of class discipline, teaching success, teaching commitment, and a sense of self-confidence. Experiences of teaching practice, electives, pupils, and teaching practice supervisors (Electives) were the major sources for the development of a sense of teaching efficacy. Implications of how those aspects of teacher training can be more effective in engendering a sense of efficacy in the student teachers are discussed.     

The pathway to English word reading in Chinese ESL children: the role of spelling

The present longitudinal study investigated the role of spelling as a bridge between various reading-related predictors and English word reading in Chinese children learning English as a Second Language (ESL). One hundred and forty-one 5-year-old kindergarten children from Hong Kong, whose first language (L1) was Cantonese and second language (L2) was English, were administered tests of phonological awareness, letter knowledge, English vocabulary, spelling and English word reading at three time points (T1, T2 and T3) at 3-month intervals over a 6-month period. Nonverbal IQ was included as a control variable. The results showed that phonological awareness, letter knowledge and English vocabulary at T1 all predicted English word reading (T3) through spelling (T2). Further mediation analyses showed that, for phonological awareness and English vocabulary, full mediation effects were found. For letter knowledge, a partial mediation effect was observed. These results suggest that, in Chinese ESL kindergarteners, reading-related predictors foster word reading via spelling, a process that intersects phonology, orthography and semantics. Practical implications of these findings were also discussed.     

Associations of Warmth and Control of Filipina Domestic Helpers and Mothers to Hong Kong Kindergarten Children's Social Competence

Research Findings: Across 63 Hong Kong families, both Filipina domestic helpers and mothers separately rated their own caregiving style (warmth and control) and kindergarten children's social competence. Results indicated that Filipina helpers rated themselves as higher in warmth than mothers did. In addition, self-rated warmth of both caregivers, and Filipina domestic helpers' self-perceived control were correlated with children's social competence. With ratings of warmth and control from both Filipina helpers and mothers included in separate regression equations, mothers' warmth was a strong unique correlate of all measures of children's social competence. However, Filipinas' warmth was uniquely associated with children's responsibility only, whereas their control was uniquely associated with children's assertion and responsibility. Practice or Policy: Results extend previous research on the importance of nonparental caregivers for children's social development in a new cultural context.     

The evolution of special education in Malaysia

This article traces the evolution of special education in Malaysia across four chronological stages: before and during the early colonial period (before 1900), pre‐independence (1900–1957), post‐independence (1957–1990) and modern Malaysia (1990 to the present), through document analysis. By placing current issues and trends within a historical perspective, we can provide a context for understanding current practices in relation to shifts in policy paradigms. The effects of policy changes throughout the years are discussed in the context of issues facing special education today. Identifiable areas of improvements are organised into eight themes: (1) provision of education for students with special needs and the degree to which they are inclusive; (2) encouragement of diversity within highly structured education systems; (3) the importance of funding; (4) restructuring pre‐service teacher preparation; (5) multidisciplinary support and collaboration; (6) programme outcomes; (7) provision of related services; and (8) epidemiological data.     

School desegregation in Hong Kong: non-Chinese linguistic minority students' challenges to learning Chinese in mainstream schools

The enactment of the revised School Places Allocation Systems at the compulsory stage in 2004 had the aim of desegregating Hong Kong's non-Chinese linguistic minority (NCLM) students by including them into ethnic Chinese-dominated mainstream primary and secondary schools. Because of the presumed cause-consequence relationship between “desegregated” school participation and academic achievement, in specific second language Chinese (CSL) acquisition, the challenges that such students face in participating in mainstream education and learning Chinese, no doubt, deserve to be examined. This qualitative study conducted in-depth interviews with 18 secondary students of South Asian/Southeast Asian minority backgrounds enrolled in mainstream schools. Drawing on both cultural and institutional paradigms of explanation for educational achievement, we argue that the reasons inhibiting the minority students' academic involvement are not simply their linguistic challenges but also the institutional constraints in the mainstream education system unique to this population. This study calls for a shift in school desegregation arrangement from one focusing narrowly on physical desegregation to a more comprehensive set of policies that embrace the institutional factors including teacher expectation, resource availability, and bilingual support, crucial to reduce racial differences in achievement.