Cyberbullying - when does a school authority\u27s liability in tort end?

Cyberbullying in schools is increasing on an alarming rate. The development of the Internet and smartphone technology have increased the potential scope of a school authority’s duty of care for its students. A question frequently asked by educators is “Where does a school authority’s duty of care end in the interconnected, 24/7 world of the Internet?” This paper argues that a duty of care will be owed where the school is in a school/student relationship with its students. That relationship can exist outside the school gates and outside of school hours. There are no decisions of senior appellate courts that deal with a school authority’s liability for cyberbullying. The authors, therefore, analyse the nature of the relationship to identify the key features that must be present to establish the existence of a duty of care. Three features are identified as critical to the existence of the duty of care outside of the normal school hours. They are the extent to which the school authority controls or ought to control a given situation, the extent to which it has encouraged students to participate in a particular activity and the extent to which a school authority is aware or ought to be aware of risks associated with the relevant activity of its students

Bayesian Methodology for Ocean Color Remote Sensing

66 pagesThe inverse ocean color problem, i.e., the retrieval of marine reflectance from top-of-atmosphere (TOA) reflectance, is examined in a Bayesian context. The solution is expressed as a probability distribution that measures the likelihood of encountering specific values of the marine reflectance given the observed TOA reflectance. This conditional distribution, the posterior distribution, allows the construction of reliable multi-dimensional confidence domains of the retrieved marine reflectance. The expectation and covariance of the posterior distribution are computed, which gives for each pixel an estimate of the marine reflectance and a measure of its uncertainty. Situations for which forward model and observation are incompatible are also identified. Prior distributions of the forward model parameters that are suitable for use at the global scale, as well as a noise model, are determined. Partition-based models are defined and implemented for SeaWiFS, to approximate numerically the expectation and covariance. The ill-posed nature of the inverse problem is illustrated, indicating that a large set of ocean and atmospheric states, or pre-images, may correspond to very close values of the satellite signal. Theoretical performance is good globally, i.e., on average over all the geometric and geophysical situations considered, with negligible biases and standard deviation decreasing from 0.004 at 412 nm to 0.001 at 670 nm. Errors are smaller for geometries that avoid Sun glint and minimize air mass and aerosol influence, and for small aerosol optical thickness and maritime aerosols. The estimated uncertainty is consistent with the inversion error. The theoretical concepts and inverse models are applied to actual SeaWiFS imagery, and comparisons are made with estimates from the SeaDAS standard atmospheric correction algorithm and in situ measurements. The Bayesian and SeaDAS marine reflectance fields exhibit resemblance in patterns of variability, but the Bayesian imagery is less noisy and characterized by different spatial de-correlation scales, with more realistic values in the presence of absorbing aerosols. Experimental errors obtained from match-up data are similar to the theoretical errors determined from simulated data. Regionalization of the inverse models is a natural development to improve retrieval accuracy, for example by including explicit knowledge of the space and time variability of atmospheric variables

Exploring the Impact of Single-Nucleotide Polymorphisms on Translation

Over the past 15 years, sequencing of the human genome and The Cancer Genome Atlas (TCGA) project have led to comprehensive lists of single-nucleotide polymorphisms (SNPs) and gene mutations across a large number of human samples. However, our ability to predict the functional impact of SNPs and mutations on gene expression is still in its infancy. Here, we provide key examples to help understand how mutations present in genes can affect translational output

Soil Moisture Sensing via Swept Frequency Based Microwave Sensors

There is a need for low-cost, high-accuracy measurement of water content in various materials. This study assesses the performance of a new microwave swept frequency domain instrument (SFI) that has promise to provide a low-cost, high-accuracy alternative to the traditional and more expensive time domain reflectometry (TDR). The technique obtains permittivity measurements of soils in the frequency domain utilizing a through transmission configuration, transmissometry, which provides a frequency domain transmissometry measurement (FDT). The measurement is comparable to time domain transmissometry (TDT) with the added advantage of also being able to separately quantify the real and imaginary portions of the complex permittivity so that the measured bulk permittivity is more accurate that the measurement TDR provides where the apparent permittivity is impacted by the signal loss, which can be significant in heavier soils. The experimental SFI was compared with a high-end 12 GHz TDR/TDT system across a range of soils at varying soil water contents and densities. As propagation delay is the fundamental measurement of interest to the well-established TDR or TDT technique; the first set of tests utilized precision propagation delay lines to test the accuracy of the SFI instrument’s ability to resolve propagation delays across the expected range of delays that a soil probe would present when subjected to the expected range of soil types and soil moisture typical to an agronomic cropping system. The results of the precision-delay line testing suggests the instrument is capable of predicting propagation delays with a RMSE of +/−105 ps across the range of delays ranging from 0 to 12,000 ps with a coefficient of determination of r2 = 0.998. The second phase of tests noted the rich history of TDR for prediction of soil moisture and leveraged this history by utilizing TDT measured with a high-end Hewlett Packard TDR/TDT instrument to directly benchmark the SFI instrument over a range of soil types, at varying levels of moisture. This testing protocol was developed to provide the best possible comparison between SFI to TDT than would otherwise be possible by using soil moisture as the bench mark, due to variations in soil density between soil water content levels which are known to impact the calibration between TDR’s estimate of soil water content from the measured propagation delay which is converted to an apparent permittivity measurement. This experimental decision, to compare propagation delay of TDT to FDT, effectively removes the errors due to variations in packing density from the evaluation and provides a direct comparison between the SFI instrument and the time domain technique of TDT. The tests utilized three soils (a sand, an Acuff loam and an Olton clay-loam) that were packed to varying bulk densities and prepared to provide a range of water contents and electrical conductivities by which to compare the performance of the SFI technology to TDT measurements of propagation delay. For each sample tested, the SFI instrument and the TDT both performed the measurements on the exact same probe, thereby both instruments were measuring the exact same soil/soil-probe response to ensure the most accurate means to compare the SFI instrument to a high-end TDT instrument. Test results provided an estimated instrumental accuracy for the SFI of +/−0.98% of full scale, RMSE basis, for the precision delay lines and +/−1.32% when the SFI was evaluated on loam and clay loam soils, in comparison to TDT as the bench-mark. Results from both experiments provide evidence that the low-cost SFI approach is a viable alternative to conventional TDR/TDT for high accuracy applications

Motivation and Dropout in Female Handballers: A 21-month Prospective Study

International audienceThe purpose of this study was to test a motivational model of sport dropout that integrates the 4 stage-causal sequence proposed by the Hierarchical Model of Vallerand (1997) and elements from achievement goal theory (Nicholls, 1989). The model posits that a task involving motivational climate facilitates, while an ego-involving climate undermines, perceptions of competence, autonomy, and relatedness. In turn, feeling incompetent, non autonomous, and unrelated to others undermines self-determined motivation toward handball which leads to the intention of dropping out of handball. Finally, such intentions are implemented later on. Three-hundred and thirty-five females handballers completed a motivation questionnaire and were followed for 21-months. Results from structural equation modeling analyses provided basic support for the model. Findings are discussed in light of their theoretical and applied implications

The relationship between services trade and government procurement commitments: Insights from relevant WTO agreements and recent RTAs

To date, government procurement has been effectively carved out of the main multilateral rules of the WTO system. This paper examines the systemic and other ramifications of this exclusion, from both an economic and a legal point of view. In addition to relevant elements of the WTO Agreements, particularly the Agreement on Government Procurement (GPA) and the General Agreement on Trade in Services (GATS), it derives insights from a large number of Regional Trade Agreements (RTAs) that embody substantive provisions on both government procurement and services trade. An important finding is that, from an economic perspective, general market access commitments with respect to services trade and commitments regarding government procurement of services are complementary and mutually reinforcing. In contrast, from a legal point of view and at the multilateral level, disciplines in the two areas have been "divided up" into two Agreements with different (but complementary) spheres of application: the key provisions regarding the scope of application of the GATS and the GPA make clear that each serves purposes that the other does not. Analysis of corresponding provisions of RTAs broadly supports and extends this finding. In light of the foregoing, a question arises as to possible ways of deepening disciplines in this area. Part 5 sets out, for reflection, several related options: (i) the built-in mandate in the GATS for negotiations on services procurement (Article XIII:2); (ii) "multilateralization" of the GPA; (iii) the reactivation of work in the (currently inactive) WTO Working Group on Transparency in Government Procurement; and (iv) the taking up of relevant issues in the context of bilateral or regional negotiations. Overall, we find that each of these possibilities has potential merits, though none is without related challenges

Assessing the value of future accessions to the WTO Agreement on Gouvenement Procurement (GPA): Some new data sources, provisional estimates, and an evaluative framework for individual WTO members considering accession

The WTO Agreement on Government Procurement (GPA) is a plurilateral Agreement, meaning that it comprises only a subset of the full Membership of the WTO. Currently, a number of WTO Members that are not Parties to the Agreement either are actively seeking accession to it, have commitments to accede to the GPA in their respective WTO accession protocols or are, on their own initiative, looking at the potential pros and cons of accession. In this context, there is a need for factual information concerning the potential consequences of GPA accession, and a framework to assess related benefits and costs. Of interest is both the systemic value of such accessions - i.e. the value they will add to the extent of market access commitments under the Agreement - and their potential benefits and costs for individual acceding Parties. This Working Paper introduces new sources of information relevant to these topics (principally, the statistical reports that have been circulated recently by GPA Parties) and shows their relevance to and usefulness in assessing the above-noted matters. The Paper presents estimates of the size of potential market access gains from pending and possible future GPA accessions, based on simple extrapolations from the data sources identified. Next, the Paper shows how the same data sources can assist in throwing light on the potential benefits and costs of GPA accession for individual WTO Members/countries contemplating accession. The latter use of the data is developed in the context of a more general discussion of the benefits and costs of GPA accession for individual WTO Members, also drawing on existing literature, qualitative aspects and insights from the field (i.e. our own work in advising and conducting seminars for such countries and other WTO Members)