Kalman reduced form and pole placement by state feedback for multi‐input linear systems over Hermite rings

[EN] A Kalman reduced form is obtained for linear systems over Hermite rings. This reduced form gives information of the set of assignable polynomials to a given linear system.S

On dynamic network security: A random decentering algorithm on graphs

pp. 656-668Random Decentering Algorithm (RDA) on a undirected unweighted graph is defined and tested over several concrete scale-free networks. RDA introduces ancillary nodes to the given network following basic principles of minimal cost, density preservation, centrality reduction and randomness. First simulations over scale-free networks show that RDA gives a significant decreasing of both betweenness centrality and closeness centrality and hence topological protection of network is improved. On the other hand, the procedure is performed without significant change of the density of connections of the given network. Thus ancillae are not distinguible from real nodes (in a straightforward way) and hence network is obfuscated to potential adversaries by our manipulation.S

On Aggregation and Prediction of Cybersecurity Incident Reports

[EN] The study of cybersecurity incidents is an active research field. The purpose of this work is to determine accurate measures of cybersecurity incidents. An effective method to aggregate cybersecurity incident reports is defined to set these measures. As a result we are able to make predictions and, therefore, to deploy security policies. Forecasting time-series of those cybersecurity aggregates is performed based on Koopman's method and Dynamic Mode Decomposition algorithm. Both techniques have shown to be accurate for a wide variety of dynamical systems ranging from fluid dynamics to social sciences. We have performed some experiments on public databases. We show that the measure of the risk trend can be effectively forecasted.S

Grupo de productores florícolas de las Banderitas: del grupo de microcredito a la autogestión del financiamiento para la producción

Este trabajo describe el trabajo de dos grupos de productores florícolas en Colonia Las Banderitas, Partido de La Plata desde sus inicios como grupos de garantía solidaria de microcréditos hasta la realización de una Asociación Civil para gestionar fondos propios. En este sentido se rescata el proceso autogestivo que ambos grupos tuvieron hasta obtener y administrar un crédito grupal destinado a la producción.Experiencias socio-organizativas. La construcción desde adentro.Universidad Nacional de La Plat

Grupo de productores florícolas de las Banderitas: del grupo de microcredito a la autogestión del financiamiento para la producción

Este trabajo describe el trabajo de dos grupos de productores florícolas en Colonia Las Banderitas, Partido de La Plata desde sus inicios como grupos de garantía solidaria de microcréditos hasta la realización de una Asociación Civil para gestionar fondos propios. En este sentido se rescata el proceso autogestivo que ambos grupos tuvieron hasta obtener y administrar un crédito grupal destinado a la producción.Experiencias socio-organizativas. La construcción desde adentro.Universidad Nacional de La Plat

Single-channel transmission in gold one-atom contacts and chains

We induce superconductivity by proximity effect in thin layers of gold and study the number of conduction channels which contribute to the current in one-atom contacts and atomic wires. The atomic contacts and wires are fabricated with a Scanning Tunneling Microscope. The set of transmission probabilities of the conduction channels is obtained from the analysis of the $I(V)$ characteristic curve which is highly non-linear due to multiple Andreev reflections. In agreement with theoretical calculations we find that there is only one channel which is almost completely open.Comment: 4 pages, 2 figures. To be published in Phys. Rev. B, Rapid Communications (2003

Shared service and value creation: Airbnb and the review system

Analisou-se percepção de valor pelo consumidor de serviços compartilhados e criação de eventuais valores pelo fornecedor. Usou-se métodos mistos para identificar estímulos, preferências e necessidades do consumidor, observando-se a percepção de valor do usuário quanto ao serviço oferecido pela Airbnb. Percebeu-se valor por meio de cinco fatores: conveniência/facilidade; segurança/confiança; atendimento; preço; questão socioambiental. A criação de valor da Airbnb está alicerçada nos perfis, comentários, atendimento personalizado, agilidade, atenção e disponibilidade na prestação de serviços e informações.The perception of value by the consumer of shared services and the creation of possible values by the supplier were analyzed. Mixed methods were used to identify consumer stimuli, preferences, and needs, observing the user’s perception of value regarding the service offered by Airbnb. Value was perceived by using five factors: convenience/ease; security/trust; service; price; social and environmental issue. Airbnb’s value creation is based on profiles, comments, personalized service, agility, attention, and availability in the provision of services and information.Se analizó la percepción de valor por parte del consumidor de servicios compartidos y la creación de posibles valores por parte del proveedor. Se utilizaron métodos mixtos para identificar los estímulos, preferencias y necesidades del consumidor, observando la percepción de valor del usuario con respecto al servicio ofrecido por Airbnb. El valor se identificó a través de cinco factores: comodidad/facilidad; seguridad/confianza; servicio; precio; asunto socioambiental. La creación de valor de Airbnb se basa en perfiles, comentarios, servicio personalizado, agilidad, atención y disponibilidad en la prestación de servicios e información

Acidente com material perfurocortante entre profissionais de enfermagem de um hospital universitário

Os riscos ocupacionais a que os profissionais da equipe de enfermagem estão sujeitos no desempenho de suasfunções são consideráveis. Assim estabeleceu-se como objetivo deste estudo analisar os acidentes perfurocortantesno período de 2002 a 2006, envolvendo a equipe de enfermagem de um hospital universitário, para compreender ocontexto em que ocorrem. A utilização destas informações pode ser ferramenta de prevenção. Estudo descritivo,retrospectivo quantitativo e qualitativo. Na análise quantitativa foi utilizada estatística descritiva e na qualitativao discurso do sujeito coletivo. Por meio das fichas de notificação do Núcleo de Vigilância Epidemiológica doHospital, foi possível identificar acidentes do gênero no período pesquisado. Entrevistas foram direcionadas àsvítimas de acidentes que tiveram como paciente-fonte portador de Síndrome da Imunodeficiência Adquirida/Vírus da Imunodeficiência Humana, hepatite B e C. Os achados demonstraram que ainda persiste um grau significativodo desconhecimento ou banalização dos acidentes entre profissionais da saúde

Internal market orientation and work-family balance in family businesses

This research paper aims at investigating the importance of work-family balance (WFB) on family businesses from Andalusia (Spain) and its impact on job satisfaction and employees' commitment. The research objectives are twofold: (1) to classify companies based on the level of WFB implementation; (2) to investigate the differences between groups of companies in relation to job satisfaction, commitment, firm size and generation. In order to achieve these objectives an empirical study was conducted with a sample of 219 family businesses. The data collected using self-completion questionnaires were analyzed using cluster analysis and Manova. Main findings show a diffusion of WFB and broad implementation in this context. Thus, WFB has a positive impact on job satisfaction and on employees' commitment. These findings contribute to the literature and practice highlighting the role of managers in the implementation of WFB and its subsequent positive return related to its impact on employees and society