Term discrimination for text search tasks derived from negative binomial distribution

Accurate term discrimination in information retrieval is essential for identifying important terms in specific documents. In addition to the widely known inverse document frequency (IDF) method, alternative approaches such as the residual inverse document frequency (RIDF) scheme have been introduced for term discrimination. However, existing methods' performance is not unconditionally convincing. We propose a new collection frequency weighting scheme derived from the negative binomial distribution model of term occurrences. Factorial experiments were performed to examine potential interaction effect between collection frequency weight methods and term frequency weight methods according to the mean average precision and normalized discounted cumulative gain performance assessors. The results indicate that our proposed term discrimination method offers a significant gain in accuracy as compared to the IDF and RIDF scheme. This finding is reinforced by the fact that the results show no interaction effects among factors.     

Dreamings beyond ‘opportunity’: the collaborative economics of an aboriginal heritage trail

This article presents the Lurujarri Heritage Trail, an Indigenous tourism experience in Northwest Australia as exemplary for a world different from the teleological-minded futurism of neoliberal market economics. Drawing on long-term ethnographic fieldwork undertaken between 2011 and 2015, it first outlines how in 1987 the Trail was established at the very margins of the Australian economy. Through its emphasis on the here and now that is grounded in a collaboration of people and land and acknowledges diverse worldviews and ontological differences, the Trail today offers its participants a means to experience Indigenous culture as different from Western politics and development policies. As a result, its allegedly marginal Dreaming (Bugarrigarra) leads beyond the pursuit of economic opportunity and in doing so enabled the defeat of large-scale industrialisation in the region.     

Output-sensitive autocompletion search

We consider the following autocompletion search scenario: imagine a user of a search engine typing a query; then with every keystroke display those completions of the last query word that would lead to the best hits, and also display the best such hits. The following problem is at the core of this feature: for a fixed document collection, given a set D of documents, and an alphabetical range W of words, compute the set of all word-in-document pairs (w, d) from the collection such that w ∈ W and d ∈ D. We present a new data structure with the help of which such autocompletion queries can be processed, on the average, in time linear in the input plus output size, independent of the size of the underlying document collection. At the same time, our data structure uses no more space than an inverted index. Actual query processing times on a large test collection correlate almost perfectly with our theoretical bound.

Radicalism in composition pedagogy

For the Record

Radicalism in composition pedagogy     

Dynamics of coordination within elite rowing crews: evidence from force pattern analysis.

For a rowing crew to be successful, the movements of the rowers need to be well coordinated. Because rowers show individual force patterns, they have to adapt their movements when rowing as a crew. In this exploratory study, these hypothesized changes in movement pattern were examined. The force graphs of six elite coxless fours crews were recorded over 11 training runs using strain gauges attached to the oars. A detailed force analysis showed that form differences, but not area differences, between force patterns decreased when force output increased as a result of two different processes. First, increasing force output reduced form differences instantaneously by reducing the individual variation in force patterns. Secondly, the kinaesthetic perception of form differences is easier than that of area differences. This better perception facilitates the adaptation of movement patterns, especially when force output is high.     

Inklusion im Sportunterricht

This review article provides an overview of the state of research in the English and German languages on inclusive physical education lessons. Studies published in journals and collected works between 2005 and 2014 were included. A systematic literature search was carried out and articles were selected according to predetermined criteria. A total of 74 articles were included in this review and categorized into the 3 superordinate topics attitude, lessons and qualifications. The compact presentation of the results revealed a tendency towards a positive attitude on inclusive physical education lessons of all participants questioned; however, teaching staff were critical of the concrete implementation of inclusive lessons and admitted that they had been insufficiently prepared for this during training. Pupils also expressed positive as well as negative experiences for participation in inclusive physical education lessons; however, some study results indicated that the acceptance of children with disabilities as well as their effectiveness of learning and physical activity can be improved by special interventional approaches. A core topic of inclusive lessons is a cooperation between the various participants. In this way problems are revealed, which can partly be attributed to the sometimes less clearly defined task profile and to discipline-specific training deficits of some participants. Finally, based on a critically constructive discussion, recommendations on further research approaches on inclusive physical education lessons in German-speaking regions are presented.     

红红小车

漫漫人生路,有谁能说自己没有过万念俱灰的时候?逢及“破屋偏遭连阴雨,漏船又遇打头风”的时刻,再理智的人有时也会一时想不开,觉得命运对自己太不公,觉得活着没意思。可是只要我们看到孩子那灿烂的笑脸,看到孩子长大了、懂事了、有出息了,所有的绝望似乎立刻便烟消云散了。这种体验,正如作者表述的:三个天真无邪、永远乐观向上的小天使,一声“妈咪,明天事情会好起来的”又一次将我从悲观和绝望中拉回到他们乐观的世界中来。19世纪20年代末30年代初的那次经济大萧条,使美国人迷茫与绝望。有谁能想到,在那个特殊的时期,重新给人们带去欢乐与笑声的竟然是一位5岁大的孩子——天才童星秀兰·邓波儿就连罗斯福总统也感谢她“在大萧条时期为千千万万的美国人带来微笑”。孩子便是这世上的一束阳光,将我们的心儿照亮。虽然大人们常常会觉得孩子们那些新奇的想法无知、幼稚,但他们身上的那份乐观,又何尝不给我们一些启示呢?     

Length effects in pseudo-word spelling: stronger in dyslexic than in non-dyslexic students

It is often discussed whether dyslexics show a deviant pattern of reading and spelling development when compared to typically developing students, or whether they follow the same pattern as other students, only at markedly slower rate. The present cross-sectional study investigated phonological encoding skills in dyslexic Danish students. We compared dyslexic and non-dyslexic students from grades 3, 5, 7, and 9 and examined whether effects of item length were stronger in the dyslexic groups. Mixed between-within subjects analyses of variance revealed significant interactions between dyslexia status and item length as the dyslexics at all grade levels were more affected by item length than their non-dyslexic peers. A marked developmental delay was apparent as the dyslexic group from grade 9 performed on approximately the same level as the non-dyslexic group from grade 3. Although the overall difference between these two groups was not significant, a significant interaction between dyslexia status and item length remained because the grade 9 dyslexics were more affected by item length than the younger non-dyslexic students. This difference in error profiles suggests a difference in the developmental patterns of dyslexic vs. non-dyslexic students.