Construction of m^4 Run Linear Graphs by Finite Geometries

Finite projective geometries are used to obtain some series of Taguchi\u27s linear graphs involving m^4 runs, where m is a prime or a prime power. The concept of maximal linear graph is introduced to reduce the number of nonisomorphic linear graphs. Some 81-run maximal linear graphs are given as examples. A table of 27 nonisomorphic 16-run maximal linear graphs, which is believed to be complete, is provided

On The Construction of Mixed Orthogonal Arrays of Strength Two

The generalized Kronecker sum was used by Wang and Wu (J. Amer. Statist. Assoc. 86 (1991) 450) and Dey and Midha (Statist. Probab. Lett. 28 (1996) 211; Proc. AP Akad. Sci. 5 (2001) 39) to construct mixed orthogonal arrays. We modify their methods to obtain several families of mixed orthogonal arrays. Some new arrays with run size less than 100 are found

Development and reliability of a scale of physical activity-related informal social control for parents of Chinese pre-schoolers

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Poly[[μ-1,4-bis­(4,5-dihydro-1,3-oxazol-2-yl)benzene-κ2 N:N′]di-μ-bromido-cadmium]

In the title coordination polymer, [CdBr2(C12H12N2O2)]n, the CdII ion, situated on an inversion centre, is coordinated by four bridging Br atoms and two N atoms from two 1,4-bis­(4,5-dihydro-1,3-oxazol-2-yl)benzene (L) ligands in a distorted octa­hedral geometry. The L ligand, which also lies across an inversion centre, bridges two CdII ions, forming layers parallel to (010)

Some New Orthogonal Arrays OA (4r;r (1) 2(p);2)

We developed an algorithm to search for new orthogonal arrays, OA(4rOA(4r, r12pr12p, 2), for odd r . With it, we found new orthogonal arrays with 4r=364r=36 through 124 runs. Many other new arrays can be obtained from these new arrays

WristTrack? A Mobile Healthcare Surveillance System for Wrist Recovery Exercises

Physiotherapy is an important component for injury recovery. Progressive exercises can help in facilitating recovery when executed correctly, but it can cause damaging effects when done wrongly. However, not all patients are able to make it to the hospital every time due to reasons such as post-surgery immobility. This study introduces a self-served physiotherapy system for wrist exercises (i.e., WristTrack), allowing patients to perform wrist conditioning at their own time and place of convenience. The system integrates wearable devices with mobile and web platform, to capture, visualize and provide useful metrics for both doctors and patients to make steady progression in their recovery process

Parent-perceived neighbourhood environment, parenting practices and preschool-aged children physical activity and screen time: a cross-sectional study of two culturally and geographically diverse cities

Background: Preschool-aged children’s physical activity (PA) and screen time (ST) are important health-related behaviours likely influenced by PA opportunities, parental perceptions of neighbourhood safety and parenting practices pertaining to PA and ST. How these factors interact to impact on young children’s PA and ST, and whether their effects are generalisable across cultures and geographical location is not known. This study addressed these knowledge gaps by conducting pooled analyses of comparable data from two culturally and geographically diverse samples – Chinese parent-child dyads from an ultra-dense city (Hong Kong, China) and Latino parent-child dyads from a low-density city (Houston, USA). Methods: The analytical sample consisted of 164 Hong Kong Chinese and 84 US Latino parent-child dyads with data on socio-demographic characteristics, parent-perceived neighbourhood destinations and facilities for children’s PA, physical and social safety-related neighbourhood attributes, PA-related parenting practices and child’s ST and accelerometer-assessed PA. Generalised linear models with robust standard errors accounting for neighbourhoodlevel clustering were used to estimate associations and interaction effects. Results: Hong Kong Chinese children accumulated less PA than US Latino children, although the latter had more ST. Hong Kong Chinese parents reported more parenting practices promoting inactivity. Neighbourhood PA opportunities were positively related to children’s PA only if parental perceptions of neighbourhood safety were favourable, and the associations of physical neighbourhood environment characteristics with children’s PA and ST depended on PA-related parenting practices. Community cohesion was positively related to children’s PA and negatively related to ST, while parental promotion of ST was positively associated with children’s ST. Correlates of children’s PA and ST did not differ by city. Conclusions: The substantial diferences in activity patterns between Hong Kong Chinese and US Latino preschoolaged children observed in this study are likely due to a combination of cultural and built environmental factors. However, the fact that no between-city differences in correlates of PA and ST were detected indicates that both populations of children are equally affected by parent-perceived neighbourhood environmental characteristics and parenting practices. Overall, this study highlights the importance of considering how various individual-, home- and neighbourhood physical and social factors interact to influence young children’s health-promoting activity levels