Service Range for Air-to-Ground and Air-to-Air Communications at Frequencies above 50 Mc

Kirby, R.; Herbstreit, J. W.; Norton, Kenneth A.

doi:10.1109/jrproc.1952.273813

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…74 Interpersonal, problemsolving, cognitive, affective coping, and self-management skills are often the targets for behavioral augmentation. 75 All of these skills are aimed either directly or indirectly at preventing or coping with specific problematic risk situations.…”

Section: Modifiable Mediatorsmentioning

confidence: 99%

Prevention and Intervention Strategies for Promoting Resilience in Disadvantaged Children

Smokowski

1998

Social Service Review

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This article addresses the emergence of a resilience-based prevention practice perspective that focuses on positively affecting the development of disadvantaged, at-risk children. Significant progress has been made in understanding risk and resilience processes; however, use of the field's advances in applied settings has lagged. The article will attempt to bridge this gap by reviewing relevant issues in program design, implementation, and evaluation from a resilience perspective. Risk and resilience dynamics are briefly highlighted to illuminate theoretical routes for promoting positive adaptation. Trends in constructing preventive programs are underscored, focusing on ecological routes to behavioral and environmental change. Finally, prevention and early intervention programs for disadvantaged children ages 3 -9 illustrate issues in program conception and effectiveness. Methodological concerns in evaluation of these programs are discussed, and future recommendations are given.In the past 2 decades, enthusiasm for investigating childhood resilience and preventive interventions has developed on parallel trajectories. Both areas have enjoyed growing public attention and have begun to coalesce fragmentary research attempts into cohesive bodies of research. Yet growth has not occurred without stumbling blocks. The study of resilience has struggled to emerge from the overarching shadow of pathology, and prevention programs have been accused of lacking strong theoretical foundations or rigorous evaluation. 1 With common roots in epidemiological mapping of risk processes, these estranged disciplines are just beginning to rediscover each other and intertwine more effectively to reinforce practice applications and

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Section: Modifiable Mediatorsmentioning

confidence: 99%

Prevention and Intervention Strategies for Promoting Resilience in Disadvantaged Children

Smokowski

1998

Social Service Review

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“…5) . Then the value of this specular component can be found using eq (1). It hould be no ted that this specular component is not necessarily a contribution from a single r efl ecting r egion, but is rather a summation resulting in a wave appearing as a single coherent wave at the receiver.…”

Section: Presentation Of Resultsmentioning

confidence: 99%

“…Where the terrain is reasonably smooth, a well-defin ed "lobe structure" of field maximums and minimums is formed in space du e to the interference between the direct and the ground-reffected waves. The accepted practice in evalua ting the amplitude of a specular reflection coefficient over smooth terrain is to consider successive maximums and minimums of the field strengths of the received signal as a function of distance and to evaluate t he reffection coefficient from the following expression : (1) where: dl = distance traveled by the direct wave, d2=distance traveled by the reffected wave, E, 'f= the value of a voltage maximum, and Em=the value of a preceding or followin g voltage minimum.…”

Section: 2 Characteristic Effects Of Specular and Random Reflectionsmentioning

confidence: 99%

“…This is not an exact test, but a reliable approximation. The test was used in both directions; i.e., (1) on each flight as a separate unit, and (2) on each interval of grazing angle utilizing the data from all flights. As a result of testing each flight as a separate unit, and testing each interval of grazing angle, the normal distribution was found to approximate the distribution of k better than the distributions of k 2 and K .…”

Section: ~~Iii' Ifmentioning

confidence: 99%

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Study at 1046 megacycles per second of the reflection coefficient of irregular terrain at grazing angles

McGavin¹,

Maloney²

1959

J. RES. NATL. BUR. STAN. SECT. D. RAD. PROP.

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An experimental d etermination of the reflection coefficient over rough te rrain is r epo rted . The reflected signal received over rough terrain is considered to be mad e up oft wo components, one that is a specular component and the other a R ayleigh-distr ibuted componen t. Where one term inal is low, the Rayleigh component is considered to be small with respect to the sp.ecular component ?lIt increas:s in relative magnitude as the height of the lower te rJl?ln almcreases. A tenmnal h eIght IS reached where the specular component is no longe r ~Hgl11~Cant, and the refl ected energy is esse ntia lly Rayleigh-distributed . A t erm inal height I S qUickly reached a,?ove which the m ea n valu e of the reflected energy is relatively constant, of a low value, a nd md epend ent of the g razing angle.

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“…The network provides DA2GC capacities up to 10 Mb/s [4]. One of the first research papers dealing with DA2GC [5] focuses on propagation aspects of air-to-ground communication including antenna design. However, only a signal level is evaluated without assessment of signal quality or capacity.…”

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confidence: 99%

Performance Study on Seamless DA2GC for Aircraft Passengers toward 5G

et al. 2017

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PostprintThis is the accepted version of a paper published in IEEE Communications Magazine. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. Citation for the original published paper (version of record):Vondra, M., Dinc, E., Prytz, M., Frodigh, M., Dominic, S. et al. (2017) Performance Study on Seamless DA2GC for Aircraft Passengers Toward 5G. Magazine, https://doi.org/10.1109/ MCOM.2017.1700188 Access to the published version may require subscription. N.B. When citing this work, cite the original published paper. IEEE Communications(c) 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Permanent link to this version:http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-211292 © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works

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Service Range for Air-to-Ground and Air-to-Air Communications at Frequencies above 50 Mc

Cited by 6 publications

References 5 publications

Prevention and Intervention Strategies for Promoting Resilience in Disadvantaged Children

Prevention and Intervention Strategies for Promoting Resilience in Disadvantaged Children

Study at 1046 megacycles per second of the reflection coefficient of irregular terrain at grazing angles

Performance Study on Seamless DA2GC for Aircraft Passengers toward 5G

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