Degrees of Security: Protocol Guarantees in the Face of Compromising Adversaries

2010 ◽  
pp. 1-18 ◽  
Author(s):  
David Basin ◽  
Cas Cremers
Keyword(s):  
Security Protocol ◽  
The Face

SRCE: Security Protocol in RFID Back-End System Based on Certificate and ECDH

2014 ◽  
Vol 577 ◽  
pp. 970-973
Author(s):  
Bing Zhang ◽  
Guo Gen Wan
Keyword(s):  
Computational Efficiency ◽  
Key Exchange ◽  
Security Protocol ◽  
Security Threats ◽  
Data Confidentiality ◽  
Key Exchange Protocol ◽  
The Core ◽  
The Face ◽  
Security Properties ◽  
Technical Framework

The RFID back-end system is the core of the thing of networking technical framework, and it has suffered more security threats. In the face of these security problems in the backend system, this paper design a node bidirectional authentication and key exchange protocol based on certificate and ECDH(SRCE), to guarantee the safety of the RFID backend systems. The analysis result indicates that the protocol obtain smaller key sizes and higher computational efficiency on the performance, furthermore, there are many security properties in which, such as data confidentiality, mutual entity authentication, against known key attack, etc.

scholarly journals A Educação Infantil no Contexto da Pandemia: O Processo Ensino e Aprendizagem fora das Escolas / Early Childhood Education in the Context of the Pandemic: The Teaching and Learning Process Outside Schools

2021 ◽  
Vol 15 (57) ◽  
pp. 808-815
Author(s):  
Cosma Maria De Brito ◽  
Francisca Ivoneide Benicio Malaquias Alves
Keyword(s):  
Early Childhood ◽  
Early Childhood Education ◽  
Interpersonal Relationships ◽  
Learning Process ◽  
Teaching And Learning ◽  
Security Protocol ◽  
Educational Context ◽  
Childhood Education ◽  
The Face ◽  
Qualitative Nature

Resumo: A pandemia do Covid-19 trouxe notórias mudanças por todo o mundo, refletindo principalmente no contexto educacional, ao se ter como protocolo de segurança o fechamento das escolas, o que ocasionou o afastamento dos alunos de todas as fases de ensino, incluindo o Ensino Infantil. No que diz respeito ao Ensino Infantil se pode mencionar os impactos sentidos por essa modalidade de ensino, uma vez que a criança no seu processo de ensino e aprendizagem necessita do auxilio do professor de maneira presencial, por isso as formas de ensino surgidas no período de pandemia não se mostraram eficazes no Ensino Infantil, visto que o ensino remoto não contempla todas as dificuldades do alunado. Neste contexto, a escolha do tema se deu com o objetivo de analisar quais as mudanças referentes ao Ensino Infantil durante a pandemia da Covid-19, verificando assim como se deram as aulas durante esse período. A metodologia adotada foi uma pesquisa bibliográfica, de cunho qualitativo, que usou da pesquisa através de publicações para realizar o trabalho. A pesquisa apresentou como resultados diversas informações que sustentaram a hipótese levantada, de que as crianças tiveram notórias dificuldades em se adaptar as aulas remotas, levando em consideração o fato de que a escola não é um espaço apenas para a transmissão de conteúdos, sendo também o ambiente propicio para o desenvolvimento das relações interpessoais. Conclui se por tanto que no que tange o Ensino Infantil, as consequências do distanciamento das escolas, mesmo em face do cenário pandêmico, se tornam ainda mais atenuadas, uma vez que essas consequências quando não trabalhadas para serem revertidas, podem retardar todas as fases de ensino.                                                                                        Palavras-Chave: Educação; Ensino Infantil; Pandemia. Abstract: The Covid-19 pandemic brought notorious changes around the world, reflecting mainly in the educational context, by having as a security protocol the closing of schools, which led to the removal of students from all stages of education, including Kindergarten . With regard to Early Childhood Education, the impacts felt by this type of teaching can be mentioned, since the child in their teaching and learning process needs the help of the teacher in person, so the forms of teaching that emerged in the period pandemic did not prove effective in Kindergarten, since remote teaching does not cover all the difficulties of the students. In this context, the choice of the theme was made with the objective of analyzing the changes related to Kindergarten during the Covid-19 pandemic, thus verifying how the classes were held during this period. The methodology adopted was a bibliographical research, of a qualitative nature, which used the research through publications to carry out the work. The research presented as results several information that supported the raised hypothesis, that the children had notorious difficulties in adapting to remote classes, taking into account the fact that the school is not only a space for the transmission of content, but also the favorable environment for the development of interpersonal relationships. It is therefore concluded that with regard to Early Childhood Education, the consequences of distancing schools, even in the face of the pandemic scenario, become even more attenuated, since these consequences, when not worked to be reversed, can delay all phases of teaching.                                                                                                     Keywords:Education; Kindergarten; Pandemic. 

Why do people believe in a zero-sum economy?

2018 ◽  
Vol 41 ◽  
Author(s):  
Samuel G. B. Johnson
Keyword(s):  
Perspective Taking ◽  
Evolutionary Model ◽  
Everyday Experience ◽  
Coalitional Psychology ◽  
The Face ◽  
Zero Sum

AbstractZero-sum thinking and aversion to trade pervade our society, yet fly in the face of everyday experience and the consensus of economists. Boyer & Petersen's (B&P's) evolutionary model invokes coalitional psychology to explain these puzzling intuitions. I raise several empirical challenges to this explanation, proposing two alternative mechanisms – intuitive mercantilism (assigning value to money rather than goods) and errors in perspective-taking.

Mars: was There an Ancient Eden?

1997 ◽  
Vol 161 ◽  
pp. 203-218 ◽  
Author(s):  
Tobias C. Owen
Keyword(s):  
Positive Answer ◽  
Biogenic Elements ◽  
Habitable Zones ◽  
The Face ◽  
The Origin Of Life ◽  
Early Mars ◽  
Favorable Conditions ◽  
Open Question ◽  
Rocky Planets ◽  
Impact Erosion

AbstractThe clear evidence of water erosion on the surface of Mars suggests an early climate much more clement than the present one. Using a model for the origin of inner planet atmospheres by icy planetesimal impact, it is possible to reconstruct the original volatile inventory on Mars, starting from the thin atmosphere we observe today. Evidence for cometary impact can be found in the present abundances and isotope ratios of gases in the atmosphere and in SNC meteorites. If we invoke impact erosion to account for the present excess of129Xe, we predict an early inventory equivalent to at least 7.5 bars of CO2. This reservoir of volatiles is adequate to produce a substantial greenhouse effect, provided there is some small addition of SO2(volcanoes) or reduced gases (cometary impact). Thus it seems likely that conditions on early Mars were suitable for the origin of life – biogenic elements and liquid water were present at favorable conditions of pressure and temperature. Whether life began on Mars remains an open question, receiving hints of a positive answer from recent work on one of the Martian meteorites. The implications for habitable zones around other stars include the need to have rocky planets with sufficient mass to preserve atmospheres in the face of intensive early bombardment.

Evidence for a shear mechanism for the precipitation of γ-zirconium hydride in zirconium

1978 ◽  
Vol 36 (1) ◽  
pp. 658-659
Author(s):  
G.J.C. Carpenter
Keyword(s):  
Elevated Temperature ◽  
Strain Field ◽  
Zirconium Hydride ◽  
Zirconium Atom ◽  
Atom Diffusion ◽  
Solvus Temperature ◽  
Hexagonal Close Packed ◽  
Partial Dislocations ◽  
The Face

In zirconium-hydrogen alloys, rapid cooling from an elevated temperature causes precipitation of the face-centred tetragonal (fct) phase, γZrH, in the form of needles, parallel to the close-packed <1120>zr directions (1). With low hydrogen concentrations, the hydride solvus is sufficiently low that zirconium atom diffusion cannot occur. For example, with 6 μg/g hydrogen, the solvus temperature is approximately 370 K (2), at which only the hydrogen diffuses readily. Shears are therefore necessary to produce the crystallographic transformation from hexagonal close-packed (hep) zirconium to fct hydride.The simplest mechanism for the transformation is the passage of Shockley partial dislocations having Burgers vectors (b) of the type 1/3<0110> on every second (0001)Zr plane. If the partial dislocations are in the form of loops with the same b, the crosssection of a hydride precipitate will be as shown in fig.1. A consequence of this type of transformation is that a cumulative shear, S, is produced that leads to a strain field in the surrounding zirconium matrix, as illustrated in fig.2a.

A study of interface sliding at F.C.C.-B.C.C. boundaries in a Cu-Zn alloy

1978 ◽  
Vol 36 (1) ◽  
pp. 422-423
Author(s):  
F. Monchoux ◽  
A. Rocher ◽  
J.L. Martin
Keyword(s):  
Face Centered Cubic ◽  
Creep Tests ◽  
High Voltage Electron Microscopy ◽  
Diffusion Treatment ◽  
Voltage Electron ◽  
The Face ◽  
Face Centered ◽  
Interface Sliding ◽  
Zn Alloy ◽  
Made In

Interphase sliding is an important phenomenon of high temperature plasticity. In order to study the microstructural changes associated with it, as well as its influence on the strain rate dependence on stress and temperature, plane boundaries were obtained by welding together two polycrystals of Cu-Zn alloys having the face centered cubic and body centered cubic structures respectively following the procedure described in (1). These specimens were then deformed in shear along the interface on a creep machine (2) at the same temperature as that of the diffusion treatment so as to avoid any precipitation. The present paper reports observations by conventional and high voltage electron microscopy of the microstructure of both phases, in the vicinity of the phase boundary, after different creep tests corresponding to various deformation conditions.Foils were cut by spark machining out of the bulk samples, 0.2 mm thick. They were then electropolished down to 0.1 mm, after which a hole with thin edges was made in an area including the boundary

The glycomes of Caenorhabditis elegans and other model organisms

2002 ◽  
Vol 69 ◽  
pp. 117-134 ◽  
Author(s):  
Stuart M. Haslam ◽  
David Gems ◽  
Howard R. Morris ◽  
Anne Dell
Keyword(s):  
Caenorhabditis Elegans ◽  
Current Knowledge ◽  
Structural Data ◽  
Model Organisms ◽  
Entire Genome ◽  
C Elegans ◽  
The Face ◽  
Area Of Concern ◽  
Nematode Worm

There is no doubt that the immense amount of information that is being generated by the initial sequencing and secondary interrogation of various genomes will change the face of glycobiological research. However, a major area of concern is that detailed structural knowledge of the ultimate products of genes that are identified as being involved in glycoconjugate biosynthesis is still limited. This is illustrated clearly by the nematode worm Caenorhabditis elegans, which was the first multicellular organism to have its entire genome sequenced. To date, only limited structural data on the glycosylated molecules of this organism have been reported. Our laboratory is addressing this problem by performing detailed MS structural characterization of the N-linked glycans of C. elegans; high-mannose structures dominate, with only minor amounts of complex-type structures. Novel, highly fucosylated truncated structures are also present which are difucosylated on the proximal N-acetylglucosamine of the chitobiose core as well as containing unusual Fucα1–2Gal1–2Man as peripheral structures. The implications of these results in terms of the identification of ligands for genomically predicted lectins and potential glycosyltransferases are discussed in this chapter. Current knowledge on the glycomes of other model organisms such as Dictyostelium discoideum, Saccharomyces cerevisiae and Drosophila melanogaster is also discussed briefly.

Supporting the Use of Rudimentary Vocalizations

2014 ◽  
Vol 23 (3) ◽  
pp. 132-139 ◽  
Author(s):  
Lauren Zubow ◽  
Richard Hurtig
Keyword(s):  
Rett Syndrome ◽  
Visual Cues ◽  
Acoustic Analysis ◽  
Eye Gaze ◽  
Research Question ◽  
Primary Research ◽  
Multiple Modalities ◽  
Face To Face ◽  
Perceptual Judgments ◽  
The Face

Children with Rett Syndrome (RS) are reported to use multiple modalities to communicate although their intentionality is often questioned (Bartolotta, Zipp, Simpkins, & Glazewski, 2011; Hetzroni & Rubin, 2006; Sigafoos et al., 2000; Sigafoos, Woodyatt, Tuckeer, Roberts-Pennell, & Pittendreigh, 2000). This paper will present results of a study analyzing the unconventional vocalizations of a child with RS. The primary research question addresses the ability of familiar and unfamiliar listeners to interpret unconventional vocalizations as “yes” or “no” responses. This paper will also address the acoustic analysis and perceptual judgments of these vocalizations. Pre-recorded isolated vocalizations of “yes” and “no” were presented to 5 listeners (mother, father, 1 unfamiliar, and 2 familiar clinicians) and the listeners were asked to rate the vocalizations as either “yes” or “no.” The ratings were compared to the original identification made by the child's mother during the face-to-face interaction from which the samples were drawn. Findings of this study suggest, in this case, the child's vocalizations were intentional and could be interpreted by familiar and unfamiliar listeners as either “yes” or “no” without contextual or visual cues. The results suggest that communication partners should be trained to attend to eye-gaze and vocalizations to ensure the child's intended choice is accurately understood.

Verrucae planae of the face

1971 ◽  
Vol 104 (3) ◽  
pp. 330-330
Author(s):  
R. Lester
Keyword(s):  
The Face

Annular atrophic plaques of the face. A clinical and histologic study

1969 ◽  
Vol 100 (6) ◽  
pp. 703-716 ◽  
Author(s):  
H. B. Christianson
Keyword(s):  
Histologic Study ◽  
The Face
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