A distributed Quadtree Dictionary approach to multi-resolution visualization of scattered neutron data

Grid computing is described as dependable, seamless, pervasive access to resources and services, whereas mobile computing allows the movement of people from place to place while staying connected to resources at each location. Mobile grid computing is a new computing paradigm, which joins these two technologies by enabling access to the collection of resources within a user\u27s virtual organization while still maintaining the freedom of mobile computing through a service paradigm. A major problem in virtual organization is needs mismatch, in which one resources requests a service from another resources it is unable to fulfill, since virtual organizations are necessarily heterogeneous collections of resources. In this dissertation we propose a solution to the needs mismatch problem in the case of high energy physics data. Specifically, we propose a Quadtree Dictionary (QTD) algorithm to provide lossless, multi-resolution compression of datasets and enable their visualization on devices of all capabilities. As a prototype application, we extend the Integrated Spectral Analysis Workbench (ISAW) developed at the Intense Pulsed Neutron Source Division of the Argonne National Laboratory into a mobile Grid application, Mobile ISAW. In this dissertation we compare our QTD algorithm with several existing compression techniques on ISAW\u27s Single-Crystal Diffractometer (SCD) datasets. We then extend our QTD algorithm to a distributed setting and examine its effectiveness on the next generation of SCD datasets. In both a serial and distributed setting, our QTD algorithm performs no worse than existing techniques such as the square wavelet transform in terms of energy conservation, while providing the worst-case savings of 8:1

Issues of Architectural Description Languages for Handling Dynamic Reconfiguration

Dynamic reconfiguration is the action of modifying a software system at runtime. Several works have been using architectural specification as the basis for dynamic reconfiguration. Indeed ADLs (architecture description languages) let architects describe the elements that could be reconfigured as well as the set of constraints to which the system must conform during reconfiguration. In this work, we investigate the ADL literature in order to illustrate how reconfiguration is supported in four well-known ADLs: pi-ADL, ACME, C2SADL and Dynamic Wright. From this review, we conclude that none of these ADLs: (i) addresses the issue of consistently reconfiguring both instances and types; (ii) takes into account the behaviour of architectural elements during reconfiguration; and (iii) provides support for assessing reconfiguration, e.g., verifying the transition against properties.Comment: 6\`eme Conf\'erence francophone sur les architectures logicielles (CAL'2012), Montpellier : France (2012

Theory of SAW Gas Sensor based on Bi-layer Conductivity Changes

AbstractThe elemental theory of surface acoustic wave (SAW) gas sensor principles is reported within this work. The sensor mechanism is generally based on changes in conductivity of a bi-layer thin sensor structures. In turn, the interaction between electrical surface potential is associated with SAW propagating on piezoelectric and mobile electric charges in bi-layer sensor structures of different electrical conductivities and thicknesses. Both films are very thin in comparison to SAW wavelength and Debye screening length. This allows on one-dimensional treatment of the problem by perturbation theory

Differentiating Urban Forms: A Neighborhood Typology for Understanding Urban Water Systems

With rising populations and changing climates, urban areas need water systems capable of meeting a range of social, economic and environmental sustainability objectives. Different configurations of urban growth and development also produce varying water system outcomes. In this paper we develop a multi-dimensional classification scheme that identifies distinct configurations of ‘urban forms’ in Northern Utah, USA. We identified characteristics within urban landscapes that have been linked in the scientific literature to three types of water outcomes: water demand, water budgets, and water quality. Using publicly-available data at the census block scale, we create a typology of urban neighborhoods that share distinctive combinations of natural, built, and social structures that are expected to shape water system dynamics. The resulting typology provides a conceptual and empirical basis to generate hypotheses and design studies of complex urban water systems. We illustrate the value of the typology by using data from surveys of urban residents. While our typology classifications are unique to this region, the methodology relies on publicly available data and could be replicated in other urban areas

Nonlinear acousto-electric transport in a two-dimensional electron system

We study both theoretically and experimentally the nonlinear interaction between an intense surface acoustic wave and a two-dimensional electron plasma in semiconductor-piezocrystal hybrid structures. The experiments on hybrid systems exhibit strongly nonlinear acousto-electric effects. The plasma turns into moving electron stripes, the acousto-electric current reaches its maximum, and the sound absorption strongly decreases. To describe the nonlinear phenomena, we develop a coupled-amplitude method for a two-dimensional system in the strongly nonlinear regime of interaction. At low electron densities the absorption coefficient decreases with increasing sound intensity, whereas at high electron density the absorption coefficient is not a monotonous function of the sound intensity. High-harmonic generation coefficients as a function of the sound intensity have a nontrivial behavior. Theory and experiment are found to be in a good agreement.Comment: 27 pages, 6 figure

Creating safety : intersection of healthcare and police response to violence against immigrant south asian women in British Columbia : a service provision model

Background Intimate Partner Violence (IPV), is an internationally prevalent health and safety issue impacting women. Immigrant South Asian women (ISAW) in British Columbia (BC) remain vulnerable to serious injuries and homicides despite efforts of healthcare and police services. It is critical to improve these responses. Knowledge of the challenges to responses can inform and improve services and the well-being of ISAW. Aims This study aimed to explore the needs of ISAW and the challenges of healthcare and police responses, how these may inform responses and to compare the perspectives of survivors, responders and experts to improve the health and safety of ISAW. Methods Design: a two-phased, mixed methods study. Phase 1: a purposive sample of 4 focus groups of 22 ISAW survivors from four cities in BC. An additional focus group involved five subject matter experts. Also conducted were seven face-to-face semi-structured interviews with twelve key informants. Phase 2: a convenience sample of 128 provincial responders completed an online survey. Results The key emerging themes for survivors were the difficulties in identifying and disclosing IPV and the responses to IPV. Responders identified the gaps in services, culturally and linguistically inappropriate policies and uncoordinated and non-collaborative efforts. For the ISAW, perceptions, fears, and socio-cultural impediments hindered their disclosure of IPV. They required culturally and linguistically trauma informed responses, policies and practices to overcome multiple and complex challenges. Co-ordinated, collaborative systemic responses to improve the health and safety of ISAW were identified by all participants, including appropriate risk assessment. Conclusion This study adds to current knowledge by contributing to the understanding of IPV of ISAW from different perspectives: ISAW survivors, responders and experts. This knowledge offers potential improvements to services and policy developments to reduce the health and safety risks to IPV survivors.Doctor of Philosoph

Laboratory versus daily life gait characteristics in patients with multiple sclerosis, Parkinson’s disease, and matched controls

Background and purpose Recent findings suggest that a gait assessment at a discrete moment in a clinic or laboratory setting may not reflect functional, everyday mobility. As a step towards better understanding gait during daily life in neurological populations, we compared gait measures that best discriminated people with multiple sclerosis (MS) and people with Parkinson’s Disease (PD) from their respective, age-matched, healthy control subjects (MS-Ctl, PD-Ctl) in laboratory tests versus a week of daily life monitoring. Methods We recruited 15 people with MS (age mean ± SD: 49 ± 10 years), 16 MS-Ctl (45 ± 11 years), 16 people with idiopathic PD (71 ± 5 years), and 15 PD-Ctl (69 ± 7 years). Subjects wore 3 inertial sensors (one each foot and lower back) in the laboratory followed by 7 days during daily life. Mann–Whitney U test and area under the curve (AUC) compared differences between PD and PD-Ctl, and between MS and MS-Ctl in the laboratory and in daily life. Results Participants wore sensors for 60–68 h in daily life. Measures that best discriminated gait characteristics in people with MS and PD from their respective control groups were different between the laboratory gait test and a week of daily life. Specifically, the toe-off angle best discriminated MS versus MS-Ctl in the laboratory (AUC [95% CI] = 0.80 [0.63–0.96]) whereas gait speed in daily life (AUC = 0.84 [0.69–1.00]). In contrast, the lumbar coronal range of motion best discriminated PD versus PD-Ctl in the laboratory (AUC = 0.78 [0.59–0.96]) whereas foot-strike angle in daily life (AUC = 0.84 [0.70–0.98]). AUCs were larger in daily life compared to the laboratory. Conclusions Larger AUC for daily life gait measures compared to the laboratory gait measures suggest that daily life monitoring may be more sensitive to impairments from neurological disease, but each neurological disease may require different gait outcome measures

Applying Linked Open Data: Refining a Model of Data Sharing as Publication

Twenty-first century humanistic research has unprecedented opportunities to advance new models of scholarly communication together with new data-driven avenues of investigation. This project will help establish "data sharing as publication" as a scalable and professionally-valued model for the dissemination of humanistic research data. The project will develop case studies involving cross-collections research on trade and exchange in the Ancient Near East and East Mediterranean. In developing publishing workflows toward Linked Open Data, the project will help align the needs of the research profession with rapidly expanding capabilities of the Web of Data

Commentary on ‘Software architectures and mobility: A roadmap’

Medvidovic and Edwards provide in their paper (henceforth referred to as the Roadmap) a good survey of the variety of architectural concerns and approaches to mobility. This commentary is intended to complement the Roadmap, discussing additional or alternative concepts, issues and approaches. The ubiquity of mobile computing devices has enabled communication and access to information and services at an unprecedented scale. Novel application domains and technological advances make the boundaries between mobile, ubiquitous, pervasive and autonomic systems fuzzy. To meet user demands, applications are likely to include facets of several types of systems. We therefore start this commentary with a discussion on what mobility means (Section 2) followed by when does mobility impact architecture (Section 3). Finally, we touch upon two crucial aspects of mobile systems that can benefit from a principled architectural approach: autonomy (Section 4) and privacy (Section 5)