A hazard control system for robot manipulators

A robot for space applications will be required to complete a variety of tasks in an uncertain, harsh environment. This fact presents unusual and highly difficult challenges to ensuring the safety of astronauts and keeping the equipment they depend on from becoming damaged. The systematic approach being taken to control hazards that could result from introducing robotics technology in the space environment is described. First, system safety management and engineering principles, techniques, and requirements are discussed as they relate to Shuttle payload design and operation in general. The concepts of hazard, hazard category, and hazard control, as defined by the Shuttle payload safety requirements, is explained. Next, it is shown how these general safety management and engineering principles are being implemented on an actual project. An example is presented of a hazard control system for controlling one of the hazards identified for the Development Test Flight (DTF-1) of NASA's Flight Telerobotic Servicer, a teleoperated space robot. How these schemes can be applied to terrestrial robots is discussed as well. The same software monitoring and control approach will insure the safe operation of a slave manipulator under teleoperated or autonomous control in undersea, nuclear, or manufacturing applications where the manipulator is working in the vicinity of humans or critical hardware

Ethical implications of research on craving

Cravings, intense desires to experience the effects of a drug, are widely regarded as significant impediments to overcoming addiction, although their role in relapse may be overstated. Scientists and clinicians wish to better understand the neurobiological and cognitive basis of craving so that they may develop psychotherapeutic, pharmacological and other medical methods to reduce craving and thereby drug use. The conduct of such research raises significant ethical issues. When recruiting individuals and conducting this research, scientists need to ensure that substance dependent participants have the capacity to provide free and uncoerced consent. This is especially the case in studies in which dependent participants are given their drug of addiction or provided with other inducements to participate (e.g. financial incentives) that may undermine their ability to fully consider the risks of participation.Treatments for addiction that seek to reduce cravings may also carry risks. This includes psychotherapeutic approaches, as well as pharmacological and medical treatments. Clinicians need to consider the risks and benefits of treatment and carefully communicate these to patients. The desire to reduce urges to use drugs should not be employed to justify potentially harmful and ineffective treatments. The safety and effectiveness of emerging treatments should be assessed by well conducted randomized controlled clinical trials

Utzon: La luz definidora de la Tercera Generación

In Space, Time, and Architecture, Sigfried Giedion identified Jørn Utzon as one of the proponents and leaders of what Giedion regarded as the Third Generation of modern architecture in the 20th century. This article considers how Utzon subsequently further exemplified in later works the principles Giedion had identified as essential to that Third Generation and discusses, as Giedion did not explicitly, the significance of light in Utzon’s architecture, which plays a key role in underpinning and articulating these defining principles. This article addresses how the principles Giedion attributed to Utzon and his defining consideration of light, derived from his interpretations of his many transcultural sources of inspiration, notably including from, China, Iran, Japan, Hawaii, Mexico, and Morocco, as well as from his own Nordic realm and Europe, as can be seen in the Sydney Opera House, Can Lis in Mallorca, Melli Bank in Tehran, Kuwait National Assembly, and Bagsværd Church in Denmark, among others.En Espacio, Tiempo y Arquitectura, Sigfried Giedion identificó a Jørn Utzon como uno de los impulsores y exponentes de lo que Giedion consideraba la Tercera Generación de la arquitectura moderna en el siglo XX. Con referencia precisa a Utzon, Giedion definió la esencia de esa Tercera Generación. Este artículo analiza cómo Utzon ejemplificó en sus obras los principios que Giedion había identificado como esenciales de esa Tercera Generación y trata, como Giedion no lo hizo de manera explícita, la importancia de la luz en la arquitectura de Utzon, que desempeña un papel fundamental para apuntalar y articular estos principios definitorios. Se estudian así las particularidades que Giedion atribuyó a Utzon y su consideración definitoria de la luz, derivadas de la interpretación de sus numerosas fuentes transculturales de inspiración, en particular, de China, Irán, Japón, Hawai, México y Marruecos, así como de Europa y su propio ámbito nórdico, como se puede ver en la Ópera de Sídney, Can Lis en Mallorca, Melli Bank en Teherán, la Asamblea Nacional de Kuwait, y la Iglesia Bagsværd en Dinamarca, entre otros

Is deep brain stimulation a prospective "cure" for addiction?

Deep brain stimulation has been put forward as a potential “cure” for intractable drug addiction. This is largely based on preclinical studies in animal models of addiction and small case series of positive, but short-term, effects on addictive behaviour in highly selected individuals. The history of neurosurgical treatment for psychiatric disorders suggests that we should be cautious in prematurely advocating invasive neurosurgical procedures on the basis of such limited evidence. Further research is required in animal models of addiction and in people treated for other neurological or psychiatric disorders before trials in addicted populations can be justified