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  • 1
    Online Resource
    Online Resource
    The International Exascale Software Project roadmap
    SAGE Publications ; 2011
    In:  The International Journal of High Performance Computing Applications Vol. 25, No. 1 ( 2011-02), p. 3-60
    Details
    In: The International Journal of High Performance Computing Applications, SAGE Publications, Vol. 25, No. 1 ( 2011-02), p. 3-60
    Abstract: Over the last 20 years, the open-source community has provided more and more software on which the world’s high-performance computing systems depend for performance and productivity. The community has invested millions of dollars and years of effort to build key components. However, although the investments in these separate software elements have been tremendously valuable, a great deal of productivity has also been lost because of the lack of planning, coordination, and key integration of technologies necessary to make them work together smoothly and efficiently, both within individual petascale systems and between different systems. It seems clear that this completely uncoordinated development model will not provide the software needed to support the unprecedented parallelism required for peta/ exascale computation on millions of cores, or the flexibility required to exploit new hardware models and features, such as transactional memory, speculative execution, and graphics processing units. This report describes the work of the community to prepare for the challenges of exascale computing, ultimately combing their efforts in a coordinated International Exascale Software Project.
    Type of Medium: Online Resource
    ISSN: 1094-3420 , 1741-2846
    URL: Article
    DOI: 10.1177/1094342010391989
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2011
    detail.hit.zdb_id: 2017480-9
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  • 2
    Online Resource
    Online Resource
    Innovative Sprinkle Treatment for Thin Durable Asphalt Overlays
    SAGE Publications ; 2013
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2366, No. 1 ( 2013-01), p. 87-97
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2366, No. 1 ( 2013-01), p. 87-97
    Abstract: This paper presents techniques for improving asphalt overlays through the use of innovative surfacing technologies that employ durable local aggregates spread on a cost-effective wearing surface base mixture. A few states have used the sprinkle treatment to improve the skid resistance of pavement surfaces on top of typical asphalt pavements. Numerous approaches have been introduced to improve the performance of asphalt pavement. These improvements often add cost because they use high-quality aggregates and modified binder. Because sustainable and cost-effective pavements are being emphasized, innovative application of the sprinkle treatment has been considered. A fine-graded dense asphalt wearing surface mixture developed with the Bailey method provides a promising aggregate structure that makes it possible to ensure compactibility with relatively thinner layers of asphalt mixture. The design of the base mixture used less-expensive local aggregates, and its performance was compared in the laboratory with that of two control mixtures to evaluate durability, rut resistance, moisture susceptibility, fracture, and complex modulus. To evaluate the performance of sprinkle treatment pavements under real traffic loading, test pavements of various thicknesses were constructed in northern Illinois during October and November 2010. On-site performance tests that included noise, friction, rut depth, and texture profiles were conducted at 4-month intervals after construction. The study concluded that it is feasible to use a cost-effective alternative wearing surface that performs well.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2366-11
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2013
    detail.hit.zdb_id: 2403378-9
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  • 3
    Online Resource
    Online Resource
    Color Contrast Metrics for Head-up Displays
    SAGE Publications ; 1983
    In:  Proceedings of the Human Factors Society Annual Meeting Vol. 27, No. 11 ( 1983-10), p. 933-937
    Details
    In: Proceedings of the Human Factors Society Annual Meeting, SAGE Publications, Vol. 27, No. 11 ( 1983-10), p. 933-937
    Abstract: Recent evidence suggests that a useful metric of color contrast can be formulated in terms of distance between colors in a perceptually uniform color space. The present research adds to this evidence by presenting equations which relate distance in several spaces to response speeds for reading colored numerals superimposed upon colored backgrounds. The results suggest that several extant uniform color spaces provide no definite advantages over the (nonuniform) 1931 CIE tristimulus space and that improvements can be obtained by rescaling their axes. Two computationally simple metrics are presented which model global color contrast and color contrast complexity.
    Type of Medium: Online Resource
    ISSN: 0163-5182
    URL: Article
    DOI: 10.1177/154193128302701113
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1983
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  • 4
    Online Resource
    Online Resource
    Emergency Stent-Graft Repair of a Ruptured Hepatic Artery Secondary to Local Postoperative Peritonitis
    SAGE Publications ; 2000
    In:  Journal of Endovascular Therapy Vol. 7, No. 4 ( 2000-08), p. 324-327
    Details
    In: Journal of Endovascular Therapy, SAGE Publications, Vol. 7, No. 4 ( 2000-08), p. 324-327
    Abstract: To describe the use of a stent-graft for emergent repair of life-threatening hepatic artery hemorrhage. Methods and Results: A 57-year-old man with a 17-year history of myxoid liposarcoma underwent surgery for a recurrent abdominal mass. Multivisceral resection including a Kausch-Whipple procedure with an extended right hemicolectomy was performed. Three weeks later, an episode of gastrointestinal bleeding prompted surgical repair of the hepatic artery, which had been eroded by infection due to a leaking bilioenteric anastomosis. After 3 weeks of programmed abdominal lavage, bleeding recurred. Angiography documented another rupture of the proximal hepatic artery. After an unsuccessful attempt at coil embolization, a Hemobahn stent-graft was implanted percutaneously during simultaneous cardiopulmonary resuscitation. Hemostasis was secured, and the patient recovered. Over the 10-month follow-up, no bleeding or infection has been observed at the site of the repair, and flow through the hepatic artery endograft remains satisfactory. Conclusions: Percutaneous stent-graft placement can be employed for emergent treatment of visceral artery rupture in patients at high risk for conventional surgical repair.
    Type of Medium: Online Resource
    ISSN: 1526-6028 , 1545-1550
    URL: Article
    DOI: 10.1177/152660280000700412
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2000
    detail.hit.zdb_id: 2049858-5
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  • 5
    Online Resource
    Online Resource
    Ergotamine-Induced Acute Vascular Insufficiency of the Lower Limb : A Case Report
    SAGE Publications ; 2001
    In:  Angiology Vol. 52, No. 3 ( 2001-03), p. 217-221
    Details
    In: Angiology, SAGE Publications, Vol. 52, No. 3 ( 2001-03), p. 217-221
    Abstract: Ergotamine-containing drugs are widely used in the treatment of acute migraine attacks. Spastic vasoconstriction is one of the possible side effects usually affecting the lower extremities and sometimes leading to gangrene. A 28-year-old woman was hospitalized for severe acute arterial insufficiency of the limbs. The initial surgical approach was not successful since the diagnosis was missed. Overuse of ergotamine derivative was acknowledged by the patient, who had a long history of migraine headaches. Therefore, the patient was treated conservatively with intravenous heparin and prostaglandin infusion and sympatheticolysis via epidural catheter. The vascular complications, angiographic findings, and different modalities of treatment of ergotamine-induced peripheral vascular insufficiency of the lower limb are reviewed.
    Type of Medium: Online Resource
    ISSN: 0003-3197 , 1940-1574
    URL: Article
    DOI: 10.1177/000331970105200310
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2001
    detail.hit.zdb_id: 2065911-8
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  • 6
    Online Resource
    Online Resource
    A Study of Direct Distance Estimations to Familiar Objects in Real-Space, Two-Dimensional, and Stereographic Displays
    SAGE Publications ; 1982
    In:  Proceedings of the Human Factors Society Annual Meeting Vol. 26, No. 4 ( 1982-10), p. 324-328
    Details
    In: Proceedings of the Human Factors Society Annual Meeting, SAGE Publications, Vol. 26, No. 4 ( 1982-10), p. 324-328
    Abstract: Stereographic displays are being considered or are under development for a variety of military and civilian applications in which the visual simulation of depth is of prime importance. A study comparing direct distance estimations to familiar objects under impoverished stimulus conditions from a real-space setting and 2- and 3-dimensional rear-projected color photographic displays was conducted to determine their relative merits in providing absolute depth information. Results indicated similar utility among the displays employed for the experimental task. However, observers rated their confidence in making distance estimations highest for the stereographic display. Some theoretical implications and methodological problems are discussed.
    Type of Medium: Online Resource
    ISSN: 0163-5182
    URL: Article
    DOI: 10.1177/154193128202600412
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1982
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  • 7
    Online Resource
    Online Resource
    The role of the mesolimbic dopamine system in the formation of blood-oxygen-level dependent responses in the medial prefrontal/anterior cingulate cortex during high-frequency stimulation of the rat perforant pathway
    SAGE Publications ; 2016
    In:  Journal of Cerebral Blood Flow & Metabolism Vol. 36, No. 12 ( 2016-12), p. 2177-2193
    Details
    In: Journal of Cerebral Blood Flow & Metabolism, SAGE Publications, Vol. 36, No. 12 ( 2016-12), p. 2177-2193
    Abstract: Several human functional magnetic resonance imaging studies point to an activation of the mesolimbic dopamine system during reward, addiction and learning. We previously found activation of the mesolimbic system in response to continuous but not to discontinuous perforant pathway stimulation in an experimental model that we now used to investigate the role of dopamine release for the formation of functional magnetic resonance imaging responses. The two stimulation protocols elicited blood-oxygen-level dependent responses in the medial prefrontal/anterior cingulate cortex and nucleus accumbens. Inhibition of dopamine D 1/5 receptors abolished the formation of functional magnetic resonance imaging responses in the medial prefrontal/anterior cingulate cortex during continuous but not during discontinuous pulse stimulations, i.e. only when the mesolimbic system was activated. Direct electrical or optogenetic stimulation of the ventral tegmental area caused strong dopamine release but only electrical stimulation triggered significant blood-oxygen level-dependent responses in the medial prefrontal/anterior cingulate cortex and nucleus accumbens. These functional magnetic resonance imaging responses were not affected by the D 1/5 receptor antagonist SCH23390 but reduced by the N-methyl-D-aspartate receptor antagonist MK801. Therefore, glutamatergic ventral tegmental area neurons are already sufficient to trigger blood-oxygen-level dependent responses in the medial prefrontal/anterior cingulate cortex and nucleus accumbens. Although dopamine release alone does not affect blood-oxygen-level dependent responses it can act as a switch, permitting the formation of blood-oxygen-level dependent responses.
    Type of Medium: Online Resource
    ISSN: 0271-678X , 1559-7016
    URL: Article
    DOI: 10.1177/0271678X15615535
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
    detail.hit.zdb_id: 2039456-1
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  • 8
    Online Resource
    Online Resource
    Expressions of Color Contrast as Equivalent Achromatic Contrast
    SAGE Publications ; 1982
    In:  Proceedings of the Human Factors Society Annual Meeting Vol. 26, No. 6 ( 1982-10), p. 581-585
    Details
    In: Proceedings of the Human Factors Society Annual Meeting, SAGE Publications, Vol. 26, No. 6 ( 1982-10), p. 581-585
    Abstract: Designers of color displays have no simple means to relate suprathreshold color contrast to performance because few of the requisite experiments have been performed. This situation might be alleviated if there were some means to re-express color contrast in terms of an equivalent achromatic contrast, because this would make relevant the extensive literature relating the latter to performance. A pair of experiments was conducted to explore and compare the relationships between color contrast, as represented by three uniform color spaces, and achromatic contrast. The results suggest that a satisfactory transformation can be derived, although additional research will be needed to accomplish this.
    Type of Medium: Online Resource
    ISSN: 0163-5182
    URL: Article
    DOI: 10.1177/154193128202600621
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1982
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  • 9
    Online Resource
    Online Resource
    The International Exascale Software Project: a Call To Cooperative Action By the Global High-Performance Community
    SAGE Publications ; 2009
    In:  The International Journal of High Performance Computing Applications Vol. 23, No. 4 ( 2009-11), p. 309-322
    Details
    In: The International Journal of High Performance Computing Applications, SAGE Publications, Vol. 23, No. 4 ( 2009-11), p. 309-322
    Abstract: Over the last 20 years, the open-source community has provided more and more software on which the world’s high-performance computing systems depend for performance and productivity. The community has invested millions of dollars and years of effort to build key components. Although the investments in these separate software elements have been tremendously valuable, a great deal of productivity has also been lost because of the lack of planning, coordination, and key integration of technologies necessary to make them work together smoothly and efficiently, both within individual petascale systems and between different systems. A repository gatekeeper and an email discussion list can coordinate open-source development within a single project, but there is no global mechanism working across the community to identify critical holes in the overall software environment, spot opportunities for beneficial integration, or specify requirements for more careful coordination. It seems clear that this completely uncoordinated development model will not provide the software needed to support the unprecedented parallelism required for peta/exascale computation on millions of cores, or the flexibility required to exploit new hardware models and features, such as transactional memory, speculative execution, and GPUs. We believe the community must work together to prepare for the challenges of exascale computing, ultimately combing their efforts in a coordinated International Exascale Software Project.
    Type of Medium: Online Resource
    ISSN: 1094-3420 , 1741-2846
    URL: Article
    DOI: 10.1177/1094342009347714
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2009
    detail.hit.zdb_id: 2017480-9
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