A New Acquisition Scheme of a DS/SS Signal with Transmit and Receive Antenna Diversity

In this paper, we propose the introduction of space diversity techniques to the code acquisition of a direct-sequence spread-spectrum signal. In this scheme, both a transmitter and a receiver have multiple antennas and the signats corresponding to all the combinations of the transmitter/receiver antennas are combined at the acquisition circuit of the receiver. The performance is evaluated for indoor packet radio corn. munication systems from the viewpoints of average time for acquisition, probahitity of success of acquisition, and necessary preamble length. As the result, we show great performance improvements by the proposed scheme under slow and flat Rayleigh fading environment.journal articl

Evidence for CP-violating asymmetries in B0→π+π- decays and constraints on the CKM angle φ2

journal articl

解釈はいかにして、学たりえるか : 「講演と対話」筆録を読んで【事後論文】

textapplication/pdfdepartmental bulletin pape

「新しい文学教育の地平」に向けて(地域から照射することばの教育)

rights: 全国大学国語教育学会 rights: 本文データは学協会の許諾に基づきCiNiiから複製したものである relation: IsVersionOf:http://ci.nii.ac.jp/naid/110006372158/textconference pape

Iakunchykova, O., Andreeva, T. I., Shkiryak-Nizhnyk, Z., Antipkin, Y., Hryhorczuk, D., Zvinchuk, A., & Chislovska, N. (2013). Optimal scaling for early life stress measurement

<p>Iakunchykova, O., Andreeva, T. I., Shkiryak-Nizhnyk, Z., Antipkin, Y., Hryhorczuk, D., Zvinchuk, A., & Chislovska, N. (2013). Optimal scaling for early life stress measurement. Tobacco Control and Public Health in Eastern Europe, 3(1), 17-27.</p> <p>BACKGROUND: Early life stress is associated with high risk for both negative psychological and physical health outcomes. However, many of the stressful life events inventories that have been used in epidemiological research have not been validated or checked for reliability or consistency. The aim of our study is to use optimal scaling and correspondence analysis that employ categorical principal components analysis (CATPCA) algorithm to consider the internal structure and the geometry of the space of variables obtained through the questions measuring early life stress. This approach was chosen because it allows quantification of categorical (both nominal and ordinal) scales and reduction of initial number of variables with interval quantification of the resulting dimensions.<br>METHODS: A questionnaire for measuring early life stress was applied to the participants of the Ukrainian component of European Longitudinal Study of Pregnancy and Childhood at the age of three and seven years. CATPCA algorithm was used to elaborate a tool for estimating related integral quantified characteristics.<br>RESULTS: Application of quantification and dimension reduction techniques to the categorical variables measuring stress in three- and seven-year-old children resulted in two dimensions.<br>The first dimension that accounts for a major part of initial variance and is associated with all the collected variables can be interpreted as the overall measure of stress. The second dimension accounts for smaller but still considerable part of variance and can be related to child’s attachment to mother and acquiring new experience as the route of development.<br>CONCLUSIONS: Application of optimal scaling to the empirical data of early life stress measurement resulted in construction of two integral indicators – first measuring overall stress and second contrasting security related to child’s attachment to mother and new experiences – consistent across age groups of three and seven-year-old children.</p> <p>KEYWORDS: psychological stress; questionnaires; mathematical models; algorithms; scaling; statistics; computation; optimal scaling; correspondence analysis.</p> <p> </p

Urinary 1-Hydroxypyrene as a Biomarker of PAH Exposure in 3-Year-Old Ukrainian Children-0

<p><b>Copyright information:</b></p><p>Taken from "Urinary 1-Hydroxypyrene as a Biomarker of PAH Exposure in 3-Year-Old Ukrainian Children"</p><p>Environmental Health Perspectives 2005;114(4):603-609.</p><p>Published online 20 Oct 2005</p><p>PMCID:PMC1440788.</p><p>This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original DOI.</p