Author: P. Papantoni-KazakosPublisher:
ISBN:
Category :
Languages : en
Pages : 56
Book Description
A random access algorithmn for environments with capture and limited feedback capabilities
Author: P. Papantoni-KazakosScientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
A window random access algorithm for environments with capture
Author: Daniel F. LyonsPublisher:
ISBN:
Category :
Languages : en
Pages : 58
Book Description
In packet radio environments, where users are independent and bursty, the deployment of Random Access transmission Algorithms, (RAAs), is recommendable. Those algorithms are implemented by each user independently, they are insensitive to changing user population, and they induce low delays. Several such algorithms have been proposed, and generally analyzed in idealistic, (noiseless and with no propagation delays), environments, and subject to the assumptions that when simultaneous transmission is then necessary, and that a single transmission is involved packets is lost and retransmission is then necessary, and that a single transmission is always received correctly. In realistic packet radio environments, however, several phenomena occur. Specifically, atmospheric noise, forward propagation delays, and multipath fading are present. Due to the atmospheric noise and the multipath fading, single transmissions are not always received correctly by the receiver. In addition, the differential forward propagation delays may be used beneficially, to allow locking in and thus capture of some packet, when simultaneous transmissions occur.
Technical Reports Awareness Circular : TRAC.
Author: Government Reports Announcements & Index
Author: Use of Services for Family Planning and Infertility, United States, 1982
Author: Gerry E. HendershotPublisher:
ISBN: 9780840602220
Category : Birth control
Languages : en
Pages : 982
Book Description
The 1982 statistics on the use of family planning and infertility services presented in this report are preliminary results from Cycle III of the National Survey of Family Growth (NSFG), conducted by the National Center for Health Statistics. Data were collected through personal interviews with a multistage area probability sample of 7969 women aged 15-44. A detailed series of questions was asked to obtain relatively complete estimates of the extent and type of family planning services received. Statistics on family planning services are limited to women who were able to conceive 3 years before the interview date. Overall, 79% of currently mrried nonsterile women reported using some type of family planning service during the previous 3 years. There were no statistically significant differences between white (79%), black (75%) or Hispanic (77%) wives, or between the 2 income groups. The 1982 survey questions were more comprehensive than those of earlier cycles of the survey. The annual rate of visits for family planning services in 1982 was 1077 visits /1000 women. Teenagers had the highest annual visit rate (1581/1000) of any age group for all sources of family planning services combined. Visit rates declined sharply with age from 1447 at ages 15-24 to 479 at ages 35-44. Similar declines with age also were found in the visit rates for white and black women separately. Nevertheless, the annual visit rate for black women (1334/1000) was significantly higher than that for white women (1033). The highest overall visit rate was for black women 15-19 years of age (1867/1000). Nearly 2/3 of all family planning visits were to private medical sources. Teenagers of all races had higher family planning service visit rates to clinics than to private medical sources, as did black women age 15-24. White women age 20 and older had higher visit rates to private medical services than to clinics. Never married women had higher visit rates to clinics than currently or formerly married women. Data were also collected in 1982 on use of medical services for infertility by women who had difficulty in conceiving or carrying a pregnancy to term. About 1 million ever married women had 1 or more infertility visits in the 12 months before the interview. During the 3 years before interview, about 1.9 million women had infertility visits. For all ever married women, as well as for white and black women separately, infertility services were more likely to be secured from private medical sources than from clinics. The survey design, reliability of the estimates and the terms used are explained in the technical notes.
Government Reports Annual Index
Author: Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1020
Book Description
Conference Record
Author: Index to IEEE Publications
Author: Institute of Electrical and Electronics EngineersPublisher:
ISBN:
Category : Electric engineering
Languages : en
Pages : 944
Book Description
Issues for 1973- cover the entire IEEE technical literature.
The Engineering Index Annual
Author: Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 2264
Book Description
Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.