Utilizando certificados implícitos para asignar identidades en overlays P2P

Desde hace años, la seguridad en las redes P2P estructuradas está siendo cuestionada, y por ello se han propuesto muchos trabajos con el objetivo de proporcionar enrutamiento seguro, sistemas de reputación, control de acceso, confidencialidad de los datos, etc. Sin embargo, el proceso de asignación de identidades se ha dejado casi totalmente olvidado. Estas redes están diseñadas para que cada usuario tenga un identificador único (nodeID), pero la mayoría de los sistemas existentes permiten que los usuarios puedan obtener un conjunto de ellos, e incluso seleccionarlos. Ambas actuaciones provocan problemas importantes de seguridad, ya que gracias a ello los usuarios pueden alterar el adecuado funcionamiento de la red. En este trabajo proponemos un protocolo de asignación de nodeIDs basado en la emisión de certificados implícitos. Nuestro propósito es proporcionar servicios de seguridad que permitan luchar contra la mayoría de las amenazas que sufren estas redes, con especial atención a la asignación de identidades. Este protocolo se basa en el uso de certificados y la generación conjunta de nodeIDs por parte la Autoridad de Certificación (CA) y el nuevo usuario.Este trabajo ha sido parcialmente subvencionado por la Secretaría de Estado de Investigación, Desarrollo e Innovación bajo los proyectos SERVET TEC2011-26452 y CONSOLIDER CSD2007-00004 (ARES), y por la Generalitat de Catalunya bajo la ayuda 2009 SGR-1362 para grupos consolidados

Manejo De Miedo, Estrategias De Afrontamiento Y Cultura Ciudadana Para Prevención De La Violencia

In this study, an intervention program was designed and evaluated. This paper focuses on identifying beliefs, perceptions, and negative attitudes in the group, in order to continue with the promotion of positive socialemotional coping and the reduction of social fear. This, however, would help to elevate the behaviors of citizen participation and to inhibit antisocial behaviors. A sample of 47 women and 5 men, a total of 52 students from 17 to 21 years, were trained by means of didactic skill of cases and training in conflict management for a period of 11 weeks in a weekend modality. A quasiexperiment was designed using repeated measures, pretest-interventionpostest, and a control group. As a result, an increase in culture and citizen participation was found in the treatment group after 44 hours of intervention. Qualitative data indicate findings regarding group cognitive relations, assertive coping strategies in conflicting social situations, ability to analyze negative feelings, and a decrease in antisocial behavior

A simple DC-UPS based in forward-forward topology, design and simulation

This paper presents the analysis, design and simulation of a simple DC-UPS converter with integrated back-up and automatic transition. This converter makes automatic transitions between the main AC and the battery when a failure occurs; and it delivers uninterrupted DC power to the load through two independent power sources of commercial input power and battery power. The converter has the following characteristics: automatic transition between the main and the battery, no additional control to detect failure in main, single structure, galvanic isolation, multi output voltages capability and only one switch control for two operation modes: normal and back-up. The analysis, design and simulation for this converter are presented

Isolated DC-DC UPS based in a forward-forward converter analysis and design

This paper presents the analysis, design and simulation from a simple DC-UPS converter with integrated back-up and automatic transition. This converter makes automatic transition between the main AC and the battery when a failure occurs, and it delivers uninterrupted DC power to the load through two independent power sources of commercial input power and battery power. The converter has the following characteristics: automatic transition between the main and the battery, no additional control to detect failure in the main, single structure, galvanic isolation, multi output voltages capability and only one switch control for two operation modes normal and back-up. The analysis, design, simulation and experimental results for this converter are presented

Mental Health, Social Support and Fatalism in Victims of the 2008 Flood in Juarez City Mexico

This study analyzed symptoms of depression, anxiety, and PTSD in flood victims from Juarez City Mexico. In July of 2008, heavy rain caused floods in several areas in Juarez, where hundreds of people experienced loss of their belongings and damage to their properties. A sample of 756 participants, interviewed in August and September of 2008, were used to compare flood victims and non-victims in levels of depression, anxiety and PTSD. The results indicated that flood victims had statistically significant higher levels in all or the variables mentioned above. In the 392 flood victims, levels of depression, anxiety, and PTSD were correlated with social support and fatalism related factors. It was found that social support and fatalism factors have a small or no relationship with mental health variables of flood victims

Mental Health and Gratitude in a Community with Social Violence

In recent years, Mexico experienced the violence, fear and terror of a drug-war. Juarez, Mexico is a border town where the highest levels of violence were registered during this war. Violence in all its forms, has been related to poor physical and mental health, therefore some of its manifestations are anxiety, phobias, sadness, depression, hostility, paranoid ideation, among other mental disorders. Positive psychology is a branch of psychology that promotes better quality of life and prevention of metal illnesses through the enhancement of positive emotions and values. Studies have shown when people go through an adverse situation, they still experience positive emotions, such as gratitude. It was the goal of the study to understand psychological distress (such as paranoid ideation, depression, hostility among other psychological problems) and its relationship with gratitude. A group of 315 college students answered the SCL-90-R , a measure of psychological problems, and the Gratitude Questionnaire (GQ-6). Significant and negative correlations between each of the SCL-90-R subscales and gratitude were obtained, that is, as gratitude increases, psychological distress decreases. It can be concluded that positive emotions, particularly gratitude, might improve the way people cope in difficult situations

Mental Health and Paranoid Thoughts in College Students from Juarez

Paranoid thoughts are a psychological consequence of the social violence lived by the people in Juarez, which in 2010 was the most violent city in the world. Most people in Juarez report some degree of paranoid thoughts and these thoughts have been related to mental health. This study analyzes the relationship between paranoid thoughts and mental health. The sample consisted of 315 college students with a mean age of 23.05 (SD = 0.59) years, 70.5% females and 29.5% males. Most of the sample was single (86.0%) and married (9.2%). The Paranoid Thoughts Scale and the Symptom Checklist-90-Revised were used to measure paranoid thoughts and mental health (e.g. depression, or anxiety), respectively. All of the mental health factors had statistically significant correlations with paranoid thoughts with correlations ranging from .38 to .57. The people that reported higher levels of paranoid thoughts also reported higher levels of psychological problems or distress. Paranoid thoughts can be considered a predictor of low mental health in people from Juarez

The impact of strategies in the marketing mix of MSMEs in the Purísima Aguascalientes, Mexico

La presente investigación fue realizada con el objetivo de conocer el impacto de las estrategias en el Marketing mix de las Mipymes en la zona de La Purísima del municipio de Aguascalientes. Se realizó un estudio cuantitativo, utilizando un modelo descriptivocorrelacional, de corte trasversal, aplicado el instrumento a una muestra de 133 propietarios de las microempresas del sector comercial en La Purísima. Para el análisis de los datos, se apoyó en la técnica estadística de regresión lineal con apoyo del software SPSS versión 20, en donde los resultados muestran ser representativos, es decir, las estrategias exploradoras y defensivas impactan más en el Marketing mix en comparación de las estrategias analizadoras y reactivas. Es de suma importancia que los dueños de estas empresas decidan hacer uso de la investigación de mercados, esto les permitiría conocer qué está demandando el mercado y qué técnicas especializadas de marketing pueden utilizar para que el Marketing mix evolucione y se acondicione a los cambios del mercado.This research was conducted in order to ascertain the impact of the strategies in the Marketing mix of MSMEs in the area of the municipality of Aguascalientes Purisima. A quantitative study was conducted using a descriptive correlational, crosssectional model, applying the instrument to a sample of 133 owners of microenterprises in the business sector in La Purísima. For the data analysis, the statistical technique of linear regression with the support of SPSS version 20 was used. The results showed to be meaningful, i.e., exploratory and defensive strategies have a greater impact on the Marketing mix compared to the analyzer and reactive strategies. It is a crucial aspect that the owners of these companies decide to use the market research, since this would allow them to know what the market is demanding and what specialized marketing techniques can be used for the Marketing mix to evolve and reflects the market changes

Antitumor and immunostimulatory activities of a genotype V recombinantattenuated veterinary Newcastle disease virus vaccine

"Antitumor conventional treatments including chemo/radiotherapy result in several side effects and non-specificity. Therapies including the use of oncolytic viruses, particularly the Newcastle disease virus (NDV), have emerged as an attractive alternative due to their capacity to kill cancer cells directly or through stimulation of the immune system. In the present study, a commercial vaccine composed of a recombinant attenuated NDV strain P05 (rNDV-P05) was assessed for antitumor and immunostimulatory activity. Firstly, hemagglutination activity was evaluated at different pH and temperature conditions. Then, cancer cell lines and peripheral blood mononuclear cells (PBMC) were co-cultured with or without rNDV-P05 and cytoplasmic nucleosomes were measured by enzyme-linked immunosorbent assay (ELISA) as an apoptosis indicator. Antitumor cytokines produced by PBMC in response to the virus were analyzed by ELISA and reverse transcription quantitative polymerase chain reaction. Characterization ofrNDV-P05 indicates that the virus is slightly sensible to acid and basic pH, and stable at temperatures no greater than 42 degrees C. The majority of cell lines developed apoptosis in co-culture with rNDV-P05 in a dose-time dependent manner. The highest level of HeLa, HCC1954 and HepG2 cell apoptosis was at 48 h/50 hemagglutination units (HU), and HL-60 was 24 h/50 HU.A549 cell line and PBMC did not show sensitivity to apoptosis by the virus. PBMC from healthy donors stimulated with the rNDV-P05 increased significantly the levels of interferon (IFN)-alpha, IFN-gamma, tumor necrosis factor (TNF)-alpha and soluble TNF-related apoptosis-inducing I igand in culture supernatants, as well as their mRNA expression. These results demonstrate that the pro-apoptotic effect ofrNDV-P05 and its magnitude is specific to particular tumor cell lines and is not induced on PBMC; and the virusstimulates the expression of several key antitumor cytokines. This study promotes the use of rNDV-P05 in an alternate application of different viral strains during virotherapy with NDV.

IMPACTO DE LA IMPLEMENTACIÓN DE LA FILOSOFÍA JAPONESA 9 “S”EN LA PLANTA POWERTRAIN DE NISSAN AGUASCALIENTES A1, MÉXICO (Impact of the implementation of the Japanese Philosophy 9 "s" in the Powertrain plant of Nissan Aguascalientes A1, Mexico)

La metodología de las 9 “s” se encuentra orientada en mantener y maximizar las condiciones de orden, limpieza y disciplina en las organizaciones, con el objetivo de incrementar el nivel de productividad y eliminar los desperdicios, siendo esta una filosofía japonesa que nace en los años 70, debido a la búsqueda de la calidad y la eficiencia. Por ende, la presente investigación tiene como objetivo examinar la calidad de vida de los trabajadores a través de la aplicación de filosofía japonesa de las 9's en sus áreas de trabajo en la planta de Nissan Aguascalientes A1, México, empleando el instrumento cuantitativo de la encuesta a 200 colaboradores que integran dicha planta. Para la recopilación de datos fue en el periodo de agosto a octubre de 2016 en una sola obtención de estos. Por otro lado, para el análisis de los datos obtenidos se utilizó la técnica estadística de análisis descriptivo y factorial exploratorio con apoyo del software SPSS versión 19. Los resultados presentan que los trabajadores consideran importante ejecutar las actividades de la Filosofía Japonesa de 9's en las áreas de trabajo, sin embargo, requieren capacitación al respecto y realizar las actividades formando grupos interdisciplinarios a fin de realizar medidas horizontales en todas las áreas a través de la comunicación