Retrieving and classifying instances of source code plagiarism     

Debasis?GangulyEmail authorView author&#;s OrcID profile  Gareth?J.?F.?Jones  Aarón?Ramírez-de-la-Cruz  Gabriela?Ramírez-de-la-Rosa  Esaú?Villatoro-Tello 《Information Retrieval》2018,21(1):1-23

Automatic detection of source code plagiarism is an important research field for both the commercial software industry and within the research community. Existing methods of plagiarism detection primarily involve exhaustive pairwise document comparison, which does not scale well for large software collections. To achieve scalability, we approach the problem from an information retrieval (IR) perspective. We retrieve a ranked list of candidate documents in response to a pseudo-query representation constructed from each source code document in the collection. The challenge in source code document retrieval is that the standard bag-of-words (BoW) representation model for such documents is likely to result in many false positives being retrieved, because of the use of identical programming language specific constructs and keywords. To address this problem, we make use of an abstract syntax tree (AST) representation of the source code documents. While the IR approach is efficient, it is essentially unsupervised in nature. To further improve its effectiveness, we apply a supervised classifier (pre-trained with features extracted from sample plagiarized source code pairs) on the top ranked retrieved documents. We report experiments on the SOCO-2014 dataset comprising 12K Java source files with almost 1M lines of code. Our experiments confirm that the AST based approach produces significantly better retrieval effectiveness than a standard BoW representation, i.e., the AST based approach is able to identify a higher number of plagiarized source code documents at top ranks in response to a query source code document. The supervised classifier, trained on features extracted from sample plagiarized source code pairs, is shown to effectively filter and thus further improve the ranked list of retrieved candidate plagiarized documents.  相似文献   

University Admissions and the Prediction of Degree Performance: an Analysis in the Light of Changes to the English Schools’ Examination System     

Ron Johnston  David Manley  Kelvyn Jones  Richard Harris  Anthony Hoare 《Higher Education Quarterly》2016,70(1):24-42

The United Kingdom's Department for Education has recently changed the nature of the AS‐level examinations normally taken by students aspiring to enter higher education degree courses one year into their post‐compulsory education. In the face of protests from universities and other institutions that this would both harm students’ progression towards the A‐level qualifications, on which entry to English universities is normally based, and make it difficult for universities determining which of their applicants were best placed to benefit from their degree courses, the Department conducted research which it claimed showed that degree outcome could be predicted as well from the results of GCSE examinations taken one year before AS‐levels as from AS‐levels themselves. This paper critiques those analyses and their conclusions showing, through a re‐analysis and extended interpretation of the Department's data, that AS‐levels provide a more reliable predictor of degree performance in 2011 than GCSEs and that many students who performed better at AS‐level than at GCSE gained a place, and performed well, at a university with high entrance standards.  相似文献   

Body composition differences by age and playing standard in male rugby union and rugby league: A systematic review and meta-analysis     

Tom Geeson-Brown  Ben Jones  Kevin Till  Sarah Chantler  Kevin Deighton 《Journal of sports sciences》2020,38(19):2161-2176

ABSTRACT

This systematic review and meta-analysis aimed to determine differences in body compositionn between playing standard and age in male rugby union and rugby league athletes. The MOOSE (Meta-analysis of Observational Studies in Epidemiology) guidelines for design, implementation, and reporting were followed. Studies were required to be in male rugby union or league and have body composition as the primary or secondary outcome. Data was required to be presented separately for positional groups and body composition presented as whole-body. A systematic search was performed in PubMed, Cochrane Library, MEDLINE, SPORTDiscus, and CINHAHL via EBSCOhost. 57 studies were included for meta-analysis. Results highlighted significantly higher fat-free mass in senior elite than senior sub-elite or junior elite athletes for all RU and RL forwards. Small and non-significant differences were found in fat mass between rugby union playing standards and age categories. Rugby league senior elite forwards had less fat mass than junior elite forwards. Practitioners should prioritise training and nutritional strategies that maximise fat-free mass development, especially in junior elite cohorts.  相似文献   

‘Just don’t tell them what’s in it’: Ethics,edible insects and sustainable food choice in schools     

Verity Jones 《British Educational Research Journal》2020,46(4):894-908

Supporting young people with global crises mitigation strategies is essential, yet loaded with ethical dilemmas for the educator. This study explores whether young people will make ethical decisions regarding the sustainability of food choice in schools, and based on the processes identified, what educators’ needs are in supporting transformative learning. This study is the first of its kind, where young people under the age of 14 have been tasting edible insects and discussing their role in a more sustainable diet. The article draws on mixed-method research with over 180 young people and their teachers in three schools in Wales and examines responses to a possible introduction of edible insects into school canteens. Highlighted is the complexity of sustainable food choices—likely to be identifiable with other young people and educators in western countries. The article considers how educators and policy makers may need to frame routes to positive sustainable action and the associated impacts these may have on personal, social, political and environmental spheres.  相似文献   

The debate over the National Curriculum for history in England and Wales, 198990: the role of the press     

Gareth Elwyn Jones 《Curriculum Journal》2013,24(3):299-322

The construction of a history curriculum for England and for Wales under the terms of the 1988 Education Reform Act occasioned more debate in the media than any other subject in the National Curriculum. The links between the content of a history syllabus and perceptions within both nations of the part this plays in moulding national spirit made this inevitable. The disparity of view between the two groups charged with devising the syllabus and the government, particularly the Prime Minister, heightened the tension. This article explores the way in which consequent political, professional and public discussion was covered in the whole range of national newspapers. It is argued that the failure of the London press to comprehend the situation in Wales reduced significantly its appreciation of the processes involved in the making of the history curriculum.  相似文献   

A kinematic analysis of the spine during rugby scrummaging on natural and synthetic turfs     

Ramesh Swaminathan  Jonathan M. Williams  Michael D. Jones 《Journal of sports sciences》2016,34(11):1058-1066

Artificial surfaces are now an established alternative to grass (natural) surfaces in rugby union. Little is known, however, about their potential to reduce injury. This study characterises the spinal kinematics of rugby union hookers during scrummaging on third-generation synthetic (3G) and natural pitches. The spine was sectioned into five segments, with inertial sensors providing three-dimensional kinematic data sampled at 40 Hz/sensor. Twenty-two adult, male community club and university-level hookers were recruited. An equal number were analysed whilst scrummaging on natural or synthetic turf. Players scrummaging on synthetic turf demonstrated less angular velocity in the lower thoracic spine for right and left lateral bending and right rotation. The general reduction in the range of motion and velocities, extrapolated over a prolonged playing career, may mean that the synthetic turf could result in fewer degenerative injuries. It should be noted, however, that this conclusion considers only the scrummaging scenario.  相似文献   

Classroom observation systems in context: A case for the validation of observation systems     

Liu  Shuangshuang  Bell  Courtney A.  Jones  Nathan D.  McCaffrey  Daniel F. 《Educational Assessment, Evaluation and Accountability》2019,31(1):61-95

Educational Assessment, Evaluation and Accountability - Researchers and practitioners sometimes presume that using a previously “validated” instrument will produce “valid”...  相似文献   

An Empirical Investigation Demonstrating the Multidimensional DIF Paradigm: A Cognitive Explanation for DIF     

Cindy M. Walker  S. Natasha Beretvas 《Journal of Educational Measurement》2001,38(2):147-163

Differential Item Functioning (DIF) is traditionally used to identify different item performance patterns between intact groups, most commonly involving race or sex comparisons. This study advocates expanding the utility of DIF as a step in construct validation. Rather than grouping examinees based on cultural differences, the reference and focal groups are chosen from two extremes along a distinct cognitive dimension that is hypothesized to supplement the dominant latent trait being measured. Specifically, this study investigates DIF between proficient and non-proficient fourth- and seventh-grade writers on open-ended mathematics test items that require students to communicate about mathematics. It is suggested that the occurrence of DIF in this situation actually enhances, rather than detracts from, the construct validity of the test because, according to the National Council of Teachers of Mathematics (NCTM), mathematical communication is an important component of mathematical ability, the dominant construct being assessed. However, the presence of DIF influences the validity of inferences that can be made from test scores and suggests that two scores should be reported, one for general mathematical ability and one for mathematical communication. The fact that currently only one test score is reported, a simple composite of scores on multiple-choice and open-ended items, may lead to incorrect decisions being made about examinees.  相似文献   

South African contributions to LGBTI education issues     

Tiffany Jones 《Sex education》2019,19(4):455-471

ABSTRACT

South Africa stands out in the African region for its protection of lesbian, gay, bisexual, transgender and intersex (LGBTI) rights. This article examines South Africa’s contributions to local policy for LGBTIs and to work on LGBTI issues in education policy and education rights progress internationally. It also considers broader South African contributions to the theorisation of gender and sexuality. Data derive from an analysis of 102 interviews with key informants participating in high-level global networking for LGBTI students’ rights, and documentary analysis showing how stakeholders characterise South African contributions to transnational LGBTI education work. Informants identified how such contributions have a strong human rights emphasis, furthering post-colonial resistance to simplistic gender and sexuality classification schema imposed via imperial colonising dynamics. While South African work in this area has also promoted and facilitated research, it has at times been limited by ambivalence from its leadership. The nation’s early adoption of constitutional rights, relationship rights and educational equity provisions as acts of decolonisation contribute valuable African LGBTI work examples to the region. Their success encourages further funding for South-South transnational LGBTI education work.  相似文献   

Characteristics of students who benefit from high-quality mathematics instruction     

Kristie K. Jones  James P. Byrnes 《Contemporary educational psychology》2006

The present study examined characteristics of students who took advantage of the opportunity to learn Algebra II from a highly skilled teacher. In particular, student information was gathered concerning: (a) the amount of mathematics students knew prior to the class, (b) their motivation for learning mathematics, (c) the number and types of interactions they had with the teacher during class, (d) degree of self-regulation, and (e) general aptitude. A model for achievement was used that suggests both opportunity and propensity are important (i.e., students must be willing and able to take advantage of opportunity). Support for the model was found. Propensity to take advantage of a highly favorable opportunity accounted for almost sixty percent of the variance in achievement. In particular, students who were self-regulated, had strong mathematics backgrounds, and had low levels of frustration benefited more from high-quality instruction.  相似文献