Avances recientes sobre el liderazgo escolar en países anglófonos

Los estudios sobre el liderazgo escolar están teniendo un desarrollo creciente en los últimos años. El interés por comprender y analizar sus características, estilos, procesos y efectos ha movilizado a numerosos especialistas y grupos de investigación en países y contextos diferentes. Animados por esa inquietud, los autores de este artículo, de las Universidades de Barcelona, Autónoma de Barcelona y de California, nos propusimos compartir conocimientos y profundizar en su estudio durante el período sabático del profesor Charles Slater en la Universidad de Barcelona en el curso 2012-2013

Repairing Landsat Satellite Imagery Using Deep Machine Learning Techniques

Satellite Imagery is one of the most widely used sources to analyze geographic features and environments in the world. The data gathered from satellites are used to quantify many vital problems facing our society, such as the impact of natural disasters, shore erosion, rising water levels, and urban growth rates. In this paper, we construct machine learning and deep learning algorithms for repairing anomalies in the Landsat satellite imagery data which arise for various reasons ranging from cloud obstruction to satellite malfunctions. The accuracy of GIS data is crucial to ensuring the models produced from such data are as close to reality as possible. Reducing the inherent bias caused by the obstruction or obfuscation of reflectance values is a simple but effective way to more closely represent the reality of our environment with satellite data. Using clean pixels from previously acquired satellite imagery, we were able to model the bias present in each scene at different times and apply algorithms to fix the inconsistencies. The machine learning model decreased the mean absolute error by an average of 80.1% compared to traditional repair algorithms such as mosaicking

Presentación: Avances recientes sobre el liderazgo escolar en países anglófonos

Los estudios sobre el liderazgo escolar están teniendo un desarrollo creciente en los últimos años. El interés por comprender y analizar sus características, estilos, procesos y efectos ha movilizado a numerosos especialistas y grupos de investigación en países y contextos diferentes. Animados por esa inquietud, los autores de este artículo, de las Universidades de Barcelona, Autónoma de Barcelona y de California, nos propusimos compartir conocimientos y profundizar en su estudio durante el período sabático del profesor Charles Slater en la Universidad de Barcelona en el curso 2012-2013

Towards social justice in highly complex schools in Catalonia, Spain

This study investigated social justice from the point of view of school directors, teachers, and parents. We chose two schools that were undergoing major demographic changes because of increased immigration into Catalonia, Spain. They were both classified as "schools of maximum complexity" because of their socio-economic characteristics. The research questions focused on how directors, teachers, and parents give meaning to social justice and what actions they take to achieve it. Teachers and principals adopted practices that have been described in leadership literature as transformational, such as building trust and challenging the process; they only occasionally showed transformative practices like those described by Santamaria (2014) as applied critical leadership (ACL). They were motivated by seeing the needs of migrant families and students with special needs. They seriously considered social cohesion and believed that all students should be given the same opportunities and treated fairly. While these principals wanted to guide teachers to see their work in new ways and develop practices to address the needs of a changing student population, they did not reflect on the connection between day-to-day problems and the larger social system. This critical perspective is essential to ACL

Lux et Lex: Volume 10, Number 1

This issue of Lux et Lex, a publication of the Chester Fritz Library at the University of North Dakota, was published in Spring 2004

The Foreign Policy of Harry S. Truman

Without knowing it, a professor of mine, Dr. Emma Lou Thornbrough, stimulated my interest in President Truman when she stated in a freshman history course that Harry S. Truman would go down in history as one of the greatest American Presidents if not the greatest because of his ingenuity in foreign policy. The exact purporse of this paper is to examine these programs

Behavioral and Electrophysiological Indices of Negative Affect Predict Cocaine Self-Administration

The motivation to seek cocaine comes in part from a dysregulation of reward processing manifested in dysphoria, or affective withdrawal. Learning is a critical aspect of drug abuse; however, it remains unclear whether drug-associated cues can elicit the emotional withdrawal symptoms that promote cocaine use. Here we report that a cocaine-associated taste cue elicited a conditioned aversive state that was behaviorally and neurophysiologically quantifiable and predicted subsequent cocaine self-administration behavior. Specifically, brief intraoral infusions of a cocaine-predictive flavored saccharin solution elicited aversive orofacial responses that predicted early-session cocaine taking in rats. The expression of aversive taste reactivity also was associated with a shift in the predominant pattern of electrophysiological activity of nucleus accumbens (NAc) neurons from inhibitory to excitatory. The dynamic nature of this conditioned switch in affect and the neural code reveals a mechanism by which cues may exert control over drug self-administration

Women becoming social justice leaders with an inclusive view in Costa Rica, Mexico and Spain

This study looks at three female school directors in Costa Rica, Mexico, and Spain who worked under challenging conditions to establish social justice. We were particularly interest in how they learned to become social justice leaders. Qualitative interviews were used to hear directly from the school directors about their experiences. Transcripts were analyzed for common themes. The commitment of these directors to social justice came from early family experiences that gave them strength and core values. They met adversity in young adulthood which reinforced their commitment to inclusive leadership