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1,403 results on '"Lau, B."'

201. Impact of current localization on the performance of compact MIMO antennas

Author

Li, Hui, Lau, B. K., Tan, Y., He, Sailing, Ying, Z., Li, Hui, Lau, B. K., Tan, Y., He, Sailing, and Ying, Z.

Abstract

In this paper, we study the influence of current localization on the isolation between two antennas in a compact terminal setting. The two antennas are chosen to be a monopole and a PIFA. The degree of current localization is controlled by the permittivity value of the PIFA's dielectric loading. Both lossless and lossy cases are simulated in order to ascertain the underlying performance impact from current localization and its potential use in real implementation. Our results show that significant isolation enhancement is achieved with more localized currents. Moreover, the technique improves the terminal's diversity and capacity performance both at the center frequency and over a given bandwidth. In addition, PIFAs with dielectric loadings of higher permittivity values and more localized currents are physically smaller. Antenna prototypes are fabricated, and the measured results agree well with the simulated results., RQC 20140919

Published
2011

202. Optimal multiple antenna design for compact MIMO terminals with ground plane excitation

Author

Li, Hui, Lau, B. K., Ying, Z., Li, Hui, Lau, B. K., and Ying, Z.

Abstract

The compactness of mobile terminals complicates the design of multiple antennas, since coupling among the antennas increases when they are placed in proximity of one another. While it is possible to mitigate coupling between closely spaced antennas, a tradeoff in bandwidth is required. In this paper, we highlight ground plane excitation as an additional dimension to consider in the design of multiple antenna terminals. This is because a compact ground plane, especially in mobile application, can interact with the antenna elements and contribute significantly to their radiation characteristics. Our results show that several design parameters, namely element locations, spacing between elements, and radiation characteristics of individual elements, must be jointly considered in order to achieve the optimal MIMO performance tradeoff for compact multiple antenna terminals., QC 20140919

Published
2011
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203. Assystem airborne wind turbine

Author

Lau, B. (author), Paerschke, M. (author), Gründel, H. (author), Lau, B. (author), Paerschke, M. (author), and Gründel, H. (author)

Published
2011

216. Measurement Properties of the Nordic Questionnaire for Psychological and Social Factors at Work: A Rasch Analysis.

Author

Røe, C., Myhre, K., Marchand, G. H., Lau, B., Leivseth, G., and Bautz-Holter, E.

Subjects
QUESTIONNAIRES, PSYCHOLOGICAL factors, RASCH models, BACKACHE, SOCIAL support
Abstract

The main aim of this study was to evaluate the measurement properties of the Nordic Questionnaire for Psychological and Social Factors at Work (QPS Nordic) and the domains of demand, control and support. The Rasch analysis (RUMM 2030) was based on responses from 226 subjects with back pain who completed the QPS Nordic dimensions of demand, control, and social support (30 items) at one year follow up. The Rasch analysis revealed disordered thresholds in a total of 25 of the 30 items. The domains of demand, control and support fit the Rasch model when analyzed separately. The demand domain was well targeted, whereas patients with current neck and back pain had lower control and higher support than reflected by the questions. Two items revealed DIF by gender, otherwise invariance to age, gender, occupation and sick-leave was documented. The demand, control support domains of QPS Nordic comprised unidimensional constructs with adequate measurement properties. [ABSTRACT FROM AUTHOR]

Published
2016

217. Neurogenin1 is a determinant of zebrafish basal forebrain dopaminergic neurons and is regulated by the conserved zinc finger protein Tof/Fezl

Author

Jeong, J, Einhorn, Z, Mercurio, S, Lee, S, Lau, B, Mione, M, Wilson, S, Guo, S, Guo, S., MERCURIO, SARA, Jeong, J, Einhorn, Z, Mercurio, S, Lee, S, Lau, B, Mione, M, Wilson, S, Guo, S, Guo, S., and MERCURIO, SARA

Abstract

The development of vertebrate basal forebrain dopaminergic (DA) neurons requires the conserved zinc finger protein Too Few (Tof/Fezl) in zebrafish. However, how Tof/Fezl regulates the commitment and differentiation of these DA neurons is not known. Proneural genes encoding basic helix-loop-helix transcription factors regulate the development of multiple neuronal lineages, but their involvement in vertebrate DA neuron determination is unclear. Here we show that neurogenin 1 (ngn1), a vertebrate proneural gene related to the Drosophila atonal, is expressed in and required for specification of DA progenitor cells, and when overexpressed leads to supernumerary DA neurons in the forebrain of zebrafish. Overexpression of ngn1 is also sufficient to induce tyrosine hydroxylase expression in addition to the panneuronal marker Hu in nonneural ectoderm. We further show that Tof/Fezl is required to establish basal forebrain ngn1-expressing DA progenitor domains. These findings identify Ngn1 as a determinant of brain DA neurons and provide insights into how Tof/Fezl regulates the development of these clinically important neuronal types. © 2006 by The National Academy of Sciences of the USA.

Published
2006

228. Structure and function in engineered lung surfactant peptides

Author

Kurutz, J.W., Gopal, A., Jiarpinitnun, C., Lau, B., Ege, C., Wu, G.H., Majewski, J., Kjær, K., Waring, A.J., Lee, K.Y.C., Kurutz, J.W., Gopal, A., Jiarpinitnun, C., Lau, B., Ege, C., Wu, G.H., Majewski, J., Kjær, K., Waring, A.J., and Lee, K.Y.C.

Published
2003

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