463 research outputs found
The Splendid Summer: Autonomous Underwater Vehicle Operations at The Center for Coastal and Ocean Mapping
No full text**In collaboration with the Coastal Sediments, Hydrodynamics and Engineering Lab University of Delaware**
The UNH Center for Coastal and Ocean Mapping operates, in collaboration with the University of Delaware, a “Gavia” model AUV, manufactured by Hafmynd EHF of Reykjavik, Iceland. The Gavia will be introduced, detailing it’s many sensor suites and capabilities. Adventures from a summer of training, learning and numerous expeditions will be recounted, including missions to our own Mendum’s Pond, Delaware Bay, Chesapeake Bay, Lake Tahoe and Abaco, Bahamas. Along the way many engineering and scientific challenges have been unearthed which will be discussed in detail as well as ongoing developments of new sensor modules and up coming missions.
Presenter Bio
Val Schmidt is pursuing a Ph.D. in Ocean Engineering under professors Chris d\u27Moustier and Larry Mayer.
Before coming to CCOM, Val served in the US Submarine Service aboard the USS HAWKBILL (SSN-666). In this capacity, Val participated in two dedicated science ( SCICEX ) missions to the Arctic in 1998 and 1999. He has since worked for Qwest Communications developing applications for Voice Over IP technologies and more recently as a research engineer for the Lamont-Doherty Earth Observatory where he built instrumentation, installed navigation and communications systems, and designed data systems for oceanographic research ships.
Val is the lead author of the MB-System Cookbook. The Cookbook provides documentation for the open source swath mapping data processing suite. He also co-developed SWAP - the Ship-to-Ship Wireless Access Protocol - a wireless mesh-networking system for the UNOLS oceanographic research fleet.
Val has a terrific and beautiful wife, Alice and a mean cat, Kokua
The use of vitamin D3 sublingual tablets versus oral drops in the treatment of patients with COMT Val/Val genotype and major depressive disorder
No full textIntroductionVitamin D has been shown to be crucial in the regulation of dopamine and its relationship to major depressive disorder.A five-year pre-interventional study of 25 hydroxy vitamin D levels in patients with major depressive disorder found values ranging from 17 to 32 ng/mL.COMT Val/Val genotype has been associated with a 20–40% more rapid breakdown of dopamine in the prefrontal cortex as compared to individuals with a Val/Met genotype.MethodsThis retrospective study gathered data concerning outcome measurements in patients who displayed a baseline 25-OH level < 30 mg/mL and initially treated with sublingual tablet form of 10,000 IU vitamin D3. These data were compared to post interventional depression outcome scores for patients switched to oral vitamin D3 drops at a dose of 10,000 IUs.ResultsScores on the MADRS 1–3 weeks following the vitamin D3 switch showed an improvement in mood with the lowering of scores on the MADRS.ConclusionsPatients with a COMT genotype of Val/Val showed clinical improvement with a switch from oral D3 sublingual tablets to oral D3 drops. Further studies are needed to draw from conclusions. Pre- and post-25-OH vitamin D levels and other dopamine synthesis variables including serum ferritin would be useful as well as prospective double-blind placebo controlled trials. The future use of genotype-specific and supportive approaches deserves serious investigation.Disclosure of interestThe author has not supplied his/her declaration of competing interest.</jats:sec
VAL: Volume and Access Pattern Leakage-abuse Attack with Leaked Documents
No full textAbstract. Searchable Encryption schemes provide secure search over encrypted databases while allowing admitted information leakages. Generally, the leakages can be categorized into access and volume pattern. In most existing SE schemes, these leakages are caused by practical designs but are considered an acceptable price to achieve high search efficiency. Recent attacks have shown that such leakages could be easily exploited to retrieve the underlying keywords for search queries. Under the umbrella of attacking SE, we design a new Volume and Access Pattern Leakage-Abuse Attack (VAL-Attack) that improves the matching technique of LEAP (CCS ’21) and exploits both the access and volume patterns. Our proposed attack only leverages leaked documents and the keywords present in those documents as auxiliary knowledge and can effectively retrieve document and keyword matches from leaked data. Furthermore, the recovery performs without false positives. We further compare VAL-Attack with two recent well-defined attacks on several real-world datasets to highlight the effectiveness of our attack and present the performance under popular countermeasures
Adventures in Iceberg Mapping
No full textIn May of 2011, the Canadian Ice Service, funded their first ever under-iceberg AUV-based mapping initiative. The Canadian Ice Service’s mission is to provide the most timely and accurate information on ice conditions in Canada’s navigable waters. The service provides radar imagery, ice bulletins, tracking of icebergs, modeling, ice coverage graphs and a host of other products to support activities such as tourism, shipping, commercial fishing and the oil and gas industry. The goal established was to map the same iceberg twice – early and again late in the summer season. Calculations of ice volume and roughness from the data would help forecast models of iceberg melt and scour. The team embarked aboard the Canadian Icebreaker Amundsen on July 18, mobilizing the entire effort in just over 2 months. The AUV was operated inverted, to allow for proper orientation of the sonar, and on a tether to allow for recovery of the AUV in the event of mission abort. To augment the AUV data, the University of New Brunswick, was enlisted to operate an EM3002 with a 40-degree side mount. This system was used to map the periphery of the berg prior to AUV operations. In addition ground penetrating radar measurements were made of the thickness of the iceberg from its surface. The iceberg found, in the truncated window allotted for search, was far larger and deeper than could be practiced during shakedown operations. Sadly, the depths required for operation, exceeding 120 m, were too deep for AUV operations with the tether. A frustrating 8 hours of attempts were executed with little data collected. None-the-less, the EM3002 dataset and GPR measurements, combined with aerial photography and the choice of a tabular iceberg provided an adequate data set for volume and roughness estimates. The iceberg was tracked with GPS/Iridium beacons through July and August. It disintegrated almost entirely in September preventing its revisiting in October. The Canadian Ice Service enlisted the AUV team to attempt a second go at under-iceberg mapping in October to resolve issues from the July cruise leg. This mission was far more successful and proved quite promising for future attempts.
Presenter Bio
Val Schmidt is pursuing a Ph.D. in Ocean Engineering under professors Chris d\u27Moustier and Larry Mayer.
Before coming to CCOM, Val served in the US Submarine Service aboard the USS HAWKBILL (SSN-666). In this capacity, Val participated in two dedicated science ( SCICEX ) missions to the Arctic in 1998 and 1999. He has since worked for Qwest Communications developing applications for Voice Over IP technologies and more recently as a research engineer for the Lamont-Doherty Earth Observatory where he built instrumentation, installed navigation and communications systems, and designed data systems for oceanographic research ships.
Val is the lead author of the MB-System Cookbook. The Cookbook provides documentation for the open source swath mapping data processing suite. He also co-developed SWAP - the Ship-to-Ship Wireless Access Protocol - a wireless mesh-networking system for the UNOLS oceanographic research fleet.
Val has a terrific and beautiful wife, Alice and a mean cat, Kokua
Prescribing by mental health nurses: the UK perspective
No full textPURPOSE. This article aims to discuss the growth of mental health nurse (MHN) prescribing in the United Kingdom as an exemplar for readers to compare progress in their own countries and context. This study also aims to provide a historical overview of this process in the United Kingdom where MHNs prescribe safely and competently.
CONCLUSIONS. Finally, evidence has shown that MHNs with prescriptive authority are competent when prescribing when compared to psychiatrists.
PRACTICE IMPLICATIONS. Despite organizational barriers and educational concerns, MHN prescribing is becoming embedded in the healthcare context in the United Kingdo
Automatic Parallelization of Data-Driven JStar Programs
No full textData-driven problems have common characteristics: a large number of small objects with complex dependencies. This makes the traditional parallel programming approaches more difficult to apply as pipe-lining the task dependencies may require to rewrite or recompile the program into efficient parallel implementations. This thesis focuses on data-driven JStar programs that have rules triggered by the tuples from a bulky CSV file or from other sources of complex data, and making those programs run fast in parallel. JStar is a new declarative language for parallel programming that encourages programmers to write their applications with implicit parallelism.
The thesis briefly introduces the JStar language and the implicit default parallelism of the JStar compiler. It describes the root causes of the poor performance of the naive parallel JStar programs and defines a performance tuning process to increase the speed of JStar programs as the number of cores increases and to minimize the memory usage in the Java Heap. Several graphic analysis tools were developed to allow easier analysis of bottlenecks in parallel programs. The JStar compiler and runtime were extended so that it is easy to apply a variety of optimisations to a JStar program without changing the JStar source code. This process was applied to four case studies which were benchmarked on different multi-core machines to measure the performance and scalability of JStar programs
Fatigue Crack Growth Under Variable Amplitude Loading Through XFEM
No full textAbstractPredicting fatigue crack growth (FCG) rate and path under variable amplitude loading (VAL) is a crucial issue in damage tolerant design commonly used in aerospace industry. The aim of the current study is to predict FCG life under VAL through Extended Finite Element Method (XFEM) and to explicitly illustrate both FCG life and crack propagation. For this purpose an algorithm is developed and integrated in ABAQUS software to analyze 3D crack propagation under VAL using Modified Generalized Willen-borg (MGW) retardation model. The results are compared with NASGRO crack propagation software and experimental FCG test data on 7075-T6 aluminum alloy under various over load (OL) and over load-under load (OL-UL) conditions which exhibit a good agreement
A model for the use of cost information in AMT environments
No full textThis thesis provides a critical review of the way in which cost information is used as a
basis for decision-support across the broad range of manufacturing activity and goes on
to propose and develop a model for the more effective use of such information. The
research "bridges" the functions of engineering, management and accounting and is innovative in the way that it places recent research in the area of management accounting into the context of engineering and management decision-making.
The review of current practice is based upon published material, a survey of practice in
three manufacturing organisations and upon extensive experience gained by the author in
industry, "Teaching Company Scheme" (TCS) supervision and supervision of industry
based undergraduate projects concerned with cost management. The research reveals
widespread belief on the part of engineers, managers and accountants, that current
approaches and practices with respect to the use of cost information do not provide a
sufficiently accurate and realistic base for decision-support and goes on to identify the
underlying reasons for this belief. Analysis and discussion is provided to support the
hypothesis that "Traditional approaches and practices with respect to the detennination,
communication and use of cost information do not provide a satisfactory basis for
decision-support in today's highly competitive and technologically advanced markets".
A comprehensive review and analysis of recent and current initiatives and developments in the areas of management accounting, concurrent engineering, structured project management and information technology is provided and forms the basis for the
development of a conceptual model. The model integrates concepts, principles and techniques from: activity based costing, "structured" project management and concurrent engineering. Recommendations for further work with respect to industrial implementation and development of the model are provided
On the development of SWOT in situ calibration/validation for short-wavelength ocean topography
No full textAuthor Posting. © American Meteorological Society, 2022. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of the Atmospheric and Oceanic Technology 39(5), (2022): 595–617, https://doi.org/10.1175/jtech-d-21-0039.1.The future Surface Water and Ocean Topography (SWOT) mission aims to map sea surface height (SSH) in wide swaths with an unprecedented spatial resolution and subcentimeter accuracy. The instrument performance needs to be verified using independent measurements in a process known as calibration and validation (Cal/Val). The SWOT Cal/Val needs in situ measurements that can make synoptic observations of SSH field over an O(100) km distance with an accuracy matching the SWOT requirements specified in terms of the along-track wavenumber spectrum of SSH error. No existing in situ observing system has been demonstrated to meet this challenge. A field campaign was conducted during September 2019–January 2020 to assess the potential of various instruments and platforms to meet the SWOT Cal/Val requirement. These instruments include two GPS buoys, two bottom pressure recorders (BPR), three moorings with fixed conductivity–temperature–depth (CTD) and CTD profilers, and a glider. The observations demonstrated that 1) the SSH (hydrostatic) equation can be closed with 1–3 cm RMS residual using BPR, CTD mooring and GPS SSH, and 2) using the upper-ocean steric height derived from CTD moorings enable subcentimeter accuracy in the California Current region during the 2019/20 winter. Given that the three moorings are separated at 10–20–30 km distance, the observations provide valuable information about the small-scale SSH variability associated with the ocean circulation at frequencies ranging from hourly to monthly in the region. The combined analysis sheds light on the design of the SWOT mission postlaunch Cal/Val field campaign.The research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004). All authors are supported by the SWOT project. J. T. Farrar was partially supported by NASA NNX16AH76G.2022-11-0
Origine et genèse de la notion d'[èthos] dans la Rhétorique d'Aristote
No full textCe travail veut montrer que la véritable saisie de la notion d èthos dans la Rhétorique d Aristote suppose la prise en compte des contextes linguistique, culturel, politique et philosophique particuliers dans lesquels le traité a été composé. Une première partie présente l analyse sémantique et linguistique d èthos tel qu il est employé dans la littérature grecque depuis Homère jusqu à Platon, et montre à quel point, au IVe siècle, cette notion est labile et ses valeurs ambigu L étude du corpus aristotélicien met ensuite en évidence l émergence, dans les Ethiques, du concept d èthos qui est remis en oeuvre par le philosophe dans d autres traités, mais avec des valeurs et des connotations différentes, variant selon les contextes. Enfin, la dernière partie de notre étude permet de vérifier l hypothèse selon laquelle la notion d èthos dans la Rhétorique, résulte d une réinterprétation de l èthos éthique , en resystématisant des éléments hérités de la rhétorique traditionnelle.This work seeks to demonstrate that a genuine understanding of the notion èthos in Aristotle s Rhetoric requires one to take into account the specific linguistic, cultural, political and philosophical contexts in which the treatise was composed. Firstly, a linguistic and semantic analysis of èthos such as it is used in Greek literature from Homer to Plato reveals the degree to which, in the Fourth Century, this notion was inconstant and values were ambiguous. A study of the body of Aristotelian works then argues that a discrete concept of èthos arose in the Ethics, which the author would later employ in other works but with different values and connotations that varied according the context in vhich they were used. A final section permits the verification of the hypothesis according to which the notion of that appears in the Rhetoric is the result ofa reinterpretation of the ethical èthos that establishes a system of elements inherited from traditional rhetoric.PARIS12-CRETEIL BU Multidisc. (940282102) / SudocSudocFranceF
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