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One Field (one + field)
Selected AbstractsShared challenges in object perception for robots and infantsINFANT AND CHILD DEVELOPMENT, Issue 1 2008Paul Fitzpatrick Abstract Robots and humans receive partial, fragmentary hints about the world's state through their respective sensors. These hints,tiny patches of light intensity, frequency components of sound, etc.,are far removed from the world of objects which we feel and perceive so effortlessly around us. The study of infant development and the construction of robots are both deeply concerned with how this apparent gap between the world and our experience of it is bridged. In this paper, we focus on some fundamental problems in perception which have attracted the attention of researchers in both robotics and infant development. Our goal was to identify points of contact already existing between the two fields, and also important questions identified in one field that could fruitfully be addressed in the other. We start with the problem of object segregation: how do infants and robots determine visually where one object ends and another begins? For object segregation, both the fields have examined the idea of using ,key events' where perception is in some way simplified and the infant or robot acquires knowledge that can be exploited at other times. We propose that the identification of the key events themselves constitutes a point of contact between the fields. Although the specific algorithms used in robots do not necessarily map directly to infant strategies, the overall ,algorithmic skeleton' formed by the set of algorithms needed to identify and exploit key events may in fact form the basis for mutual dialogue. We then look more broadly at the role of embodiment in humans and robots, and see the opportunities it affords for development. Copyright © 2008 John Wiley & Sons, Ltd. [source] Contrasting responses of arable spiders to the landscape matrix at different spatial scalesJOURNAL OF BIOGEOGRAPHY, Issue 1 2008Martin H. Schmidt Abstract Aim, Animal communities can be influenced by the composition of the surrounding landscape through immigration. Depending on habitat preferences, however, the effect of the landscape matrix can be positive or negative and can vary with scale. We tested this idea with arable spiders and tried to infer dispersal distances from relationships between local density and landscape composition at different spatial scales. Location, Thirty-eight landscapes around the cities of Göttingen and Giessen, Germany. Methods, Spiders were captured with pitfall traps in one field of winter wheat in each landscape. Landscape composition around the fields was characterized at 11 scales from 95 m to 3 km radius by land-use mapping and subsequent GIS analysis. Correlation tests were performed between landscape composition and local densities or species richness. Results, In both study regions, local species richness was enhanced by non-crop habitats on a landscape scale. The overall densities of wolf spiders (Lycosidae), long-jawed spiders (Tetragnathidae), crab spiders (Thomisidae), and dwarf sheet spiders (Hahniidae) increased significantly in landscapes with high percentages of non-crop habitats. Out of the 40 species tested, 19 responded positively to the percentage of non-crop habitats in the surrounding landscape, and five responded negatively. Depending on the species, the spatial scales with the highest explanatory power ranged from 95 m to 3 km radius around the study fields, potentially reflecting dispersal distances. Main conclusions, Arable spider species showed contrasting responses to the landscape context with respect both to the direction and to the spatial scale of the relationship. The variation in landscape requirements among species ensures high spider densities in a wide range of situations, which contributes to ecosystem resilience. However, species richness of arable spiders depends on heterogeneous landscapes with high percentages of non-crop habitats. [source] A fast hybrid algorithm for exoplanetary transit searchesMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Issue 2 2006A. Collier Cameron ABSTRACT We present a fast and efficient hybrid algorithm for selecting exoplanetary candidates from wide-field transit surveys. Our method is based on the widely used SysRem and Box Least-Squares (BLS) algorithms. Patterns of systematic error that are common to all stars on the frame are mapped and eliminated using the SysRem algorithm. The remaining systematic errors caused by spatially localized flat-fielding and other errors are quantified using a boxcar-smoothing method. We show that the dimensions of the search-parameter space can be reduced greatly by carrying out an initial BLS search on a coarse grid of reduced dimensions, followed by Newton,Raphson refinement of the transit parameters in the vicinity of the most significant solutions. We illustrate the method's operation by applying it to data from one field of the SuperWASP survey, comprising 2300 observations of 7840 stars brighter than V= 13.0. We identify 11 likely transit candidates. We reject stars that exhibit significant ellipsoidal variations caused indicative of a stellar-mass companion. We use colours and proper motions from the Two Micron All Sky Survey and USNO-B1.0 surveys to estimate the stellar parameters and the companion radius. We find that two stars showing unambiguous transit signals pass all these tests, and so qualify for detailed high-resolution spectroscopic follow-up. [source] The sustainability spectrum and the sciences of sustainabilityBUSINESS STRATEGY AND THE ENVIRONMENT, Issue 7 2008Thomas P. Seager Abstract Understanding sustainability requires integrating multiple perspectives and investigative methods to explain multidimensional concepts. However, the traditional approach to research and education is organized along disciplinary lines that tend to exclude awareness of contributions in one field that may inform problems in another. This presents a serious obstacle to advancing an understanding of sustainability, which is focused on the interactions between industrial and ecological systems, rather than examining each system independently. This paper offers a broad description of different perspectives with regard to sustainability including security, reliability, resilience and renewal, and briefly describes the emerging sciences essential to understanding sustainability: ecological economics, industrial ecology, ecosystem health, and sustainable decision making, policy and design. In the latter, the challenges have yet to find an academic locus. Nonetheless, it is in this area that knowledge of sustainability science must be applied and it is consequently most proximate to business leaders, policy makers and designers. Copyright © 2008 John Wiley & Sons, Ltd and ERP Environment. [source] A clinicoanatomical study of the novel nerve fibers linked to stress urinary incontinence: The first morphological description of a nerve descending properly along the anterior vaginal wallCLINICAL ANATOMY, Issue 3 2007Susumu Yoshida Abstract When performing anterior colporrhaphy for cystocele, most pelvic surgeons have not considered the neuroanatomy that contributes to urethral function. The aim of the study was to anatomically identify nerve fibers located in the anterior vagina associated with the pathogenesis of incontinence and pelvic organ prolapse. Anterior vaginal specimens were obtained from 17 female cadavers and 33 cases of clinical cystocele by anterior vaginal resection. The specimens were step-sectioned and stained with hematoxylin-eosin, S100 antibody, and tyrosine hydroxylase antibody. As a result, descending nerves 50,200 ,m in thickness were identified between the urethra and vagina. They were located more than 10 mm medially from a cluster of nerves found almost along the lateral edge of the vagina and stained with S100 and tyrosine hydroxylase antibody, originated from the cranial part of the pelvic plexus, and appeared to terminate at the urethral smooth muscles. The authors classified the density of S100 positive nerve fibers in the anterior vaginal wall obtained from clinically operated cases of cystocele into three grades (Grade 1, nothing or a few thin nerves less than 20 ,m in diameter; Grade 2, thick nerves more than 50 ,m in diameter and thin nerves; Grade 3, more than 3 thick nerves in one field at an objective magnification of 40××). Mean urethral mobility (Q-tip) values (28.1° ±± 19.6°) observed in the Grade 3 cases was significantly lower than those (50.0° ±± 27.4° and 59.4° ±± 19.9°) in Grade 2 and Grade 1, respectively. In addition, the presence of preoperative or postoperative stress urinary incontinence in the cases of Grade 1 was significantly higher than those of the cases with S100 positive stained nerves. In conclusion, the novel nerve fibers immunohistochemically identified in the anterior vaginal wall are different from those of the common nervous system or the pelvic floor and are associated with the pathogenesis of urethral hypermobility. Clin. Anat. 20:300,306, 2007. © 2006 Wiley-Liss, Inc. [source] BML revisited: Statistical physics, computer simulation, and probability,COMPLEXITY, Issue 2 2006Raissa M. D'Souza Abstract Statistical physics, computer simulation, and discrete mathematics are intimately related through the study of shared lattice models. These models lie at the foundation of all three fields, are studied extensively, and can be highly influential. Yet new computational and mathematical tools may challenge even well-established beliefs. Consider the BML model, which is a paradigm for modeling self-organized patterns of traffic flow and first-order jamming transitions. Recent findings, on the existence of intermediate states, bring into question the standard understanding of the jamming transition. We review the results and show that the onset of full-jamming can be considerably delayed based on the geometry of the system. We also introduce an asynchronous version of BML, which lacks the self-organizing properties of BML, has none of the puzzling intermediate states, but has a sharp, discontinuous, transition to full jamming. We believe this asynchronous version will be more amenable to rigorous mathematical analysis than standard BML. We discuss additional models, such as bootstrap percolation, the honey-comb dimer model and the rotor-router, all of which exemplify the interplay between the three fields, while also providing cautionary tales. Finally, we synthesize implications for how results from one field may relate to the other, and also implications specific to computer implementations. © 2006 Wiley Periodicals, Inc. Complexity, 12, 30,39, 2006 [source] Personal disciplinary history and views of physical punishment: implications for training mandated reportersCHILD ABUSE REVIEW, Issue 4 2005Cheryl Bluestone Abstract Many nations, including the US, Australia, and Canada, have developed legislation at the local or national level to require selected professionals to report all cases of suspected child abuse as part of the system to prevent serious injuries or fatalities. In many states of the US, including New York, child service professionals must take a training course to ensure that they are aware of their legal obligations as mandated reporters. Completion of the course is often a prerequisite to obtain certification to practise in one's field. Despite this rudimentary training, many cases of suspected abuse are not reported. Moreover, many child abuse professionals experience confusion and emotional distress in dealing with the reporting process (Buckley, 2000). While training that considers potential influences on reporting can be effective in addressing some of these issues (Hawkins et al., 2001), there are few studies of the effectiveness of current training curricula (Alvarez et al., 2004). This preliminary investigation was conducted with 80 nursing and education students, an identified group of prospective mandated reporters. We examined the potential influence of childhood disciplinary experiences and their appraisal as these factors may relate to views of discipline and abuse. The findings revealed that history of childhood experiences with discipline, in conjunction with appraisals of rejection, accounted for a small, but significant amount of the variance in students' current beliefs about appropriate discipline. The findings are considered in the context of findings about training for professionals who are in a position to report suspected child abuse. When considered with that literature, these findings suggest that disciplinary history should be considered in the context of evaluations of the effectiveness of training curricula for mandated reporters. Copyright © 2005 John Wiley & Sons, Ltd. [source] | ||||||||||