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- Voudouris, Petros, 1987, et al.
(author)
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Timing-anomaly free dynamic scheduling of task-based parallel applications
- 2017
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In: Proceedings of the IEEE Real-Time and Embedded Technology and Applications Symposium, RTAS. - 1545-3421. ; , s. 365-376
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Conference paper (peer-reviewed)abstract
- Multicore architectures can provide high predictable performance through parallel processing. Unfortunately, computing the makespan of parallel applications is overly pessimistic either due to load imbalance issues plaguing static scheduling methods or due to timing anomalies plaguing dynamic scheduling methods. This paper contributes with an anomaly-free dynamic scheduling method, called Lazy, which is non-preemptive and non-greedy in the sense that some ready tasks may not be dispatched for execution even if some processors are idle. Assuming parallel applications using contemporary taskbased parallel programming models, such as OpenMP, the general idea of Lazy is to avoid timing anomalies by assigning fixed priorities to the tasks and then dispatch selective highestpriority ready tasks for execution at each scheduling point. We formally prove that Lazy is timing-anomaly free. Unlike all the commonly-used dynamic schedulers like breadth-first and depth-first schedulers (e.g., CilkPlus) that rely on analytical approaches to determine an upper bound on the makespan of parallel application, a safe makespan of a parallel application is computed by simulating Lazy. Our experimental results show that the makespan computed by simulating Lazy is much tighter and scales better as demonstrated by four parallel benchmarks from a task-parallel benchmark suite in comparison to the state-of-the-art.
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| 2. |
- Rooth, Hetty, et al.
(author)
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Trusted and doubted : Discourses of parenting training in two Swedish official inquiries, 1947 and 2008
- 2018
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In: Scandinavian Journal of Public Health. - : SAGE Publications. - 1403-4948 .- 1651-1905. ; 46:20_suppl, s. 59-65
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Journal article (peer-reviewed)abstract
- Aim: The aim of this study was to analyse discourses of parenting training in official inquires in Sweden that explicitly deal with the bringing up of children and parental education and how the representations of the problems and their solutions affect parental subject positions in the early welfare state and at the onset of the 21st century. Method: We carried out a discourse analysis of two public inquiries of 1947 and 2008, drawing on theories about governmentality and power regimes. Tools from political discourse analysis were used to investigate the objectives of political discourse practices. Results: Both inquiries referred to a context of change and new life demands as a problem. Concerning suggestions for solutions, there were discrepancies in parents’ estimated need of expert knowledge and in descriptions of parental capacity. In a discourse of trust and doubt, the parents in 1947 were positioned as trusted welfare partners and secure raisers of future generations, and in 2008, as doubted adults, feared to be faltering in their child-rearing tasks. Conclusions: The analysis revealed how governmental problem descriptions, reasoning about causes and suggestions of solutions influenced parents’ subject positions in a discourse of trust and doubt, and made way for governmental interventions with universal parenting training in the 21st century.
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| 4. |
- Buckdahn, Rainer, et al.
(author)
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A General Stochastic Maximum Principle for SDEs of Mean-field Type
- 2011
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In: Applied mathematics and optimization. - : Springer Science and Business Media LLC. - 0095-4616 .- 1432-0606. ; 64:2, s. 197-216
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Journal article (peer-reviewed)abstract
- We study the optimal control for stochastic differential equations (SDEs) of mean-field type, in which the coefficients depend on the state of the solution process as well as of its expected value. Moreover, the cost functional is also of mean-field type. This makes the control problem time inconsistent in the sense that the Bellman optimality principle does not hold. For a general action space a Peng's-type stochastic maximum principle (Peng, S.: SIAM J. Control Optim. 2(4), 966-979, 1990) is derived, specifying the necessary conditions for optimality. This maximum principle differs from the classical one in the sense that here the first order adjoint equation turns out to be a linear mean-field backward SDE, while the second order adjoint equation remains the same as in Peng's stochastic maximum principle.
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| 8. |
- Menkis, Audrius, et al.
(author)
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High-Throughput Sequencing Shows High Fungal Diversity and Community Segregation in the Rhizospheres of Container-Grown Conifer Seedlings
- 2016
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In: Forests. - : MDPI AG. - 1999-4907. ; 7
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Journal article (peer-reviewed)abstract
- Forest nurseries in Sweden produce ca. 360 million seedlings of Pinus sylvestris L. and Picea abies (L.) Karst. annually. Fungi represent the largest microbial component in rhizospheres and may significantly affect health and, consequently, quality of the seedlings. The aim of this study was to assess fungi focusing on pathogens in roots and the sphagnum peat growth substrate of healthy-looking P. sylvestris and P. abies seedlings from nine forest nurseries situated in northern, central and southern regions of Sweden. We hypothesized that nursery stock and the growth substrate can provide a venue for dissemination of fungal diseases. In each nursery and for each tree species, 100 seedlings with the growth substrate were collected during the dormant period. DNA was isolated from parts of root systems and from samples of the growth substrate, amplified using internal transcribed spacer of rDNA as a marker and 454-sequenced. Clustering at 98.5% similarity of 169,844 high-quality sequences resulted in 619 non-singleton fungal taxa. Although results showed that management practices in forest nurseries generally give a healthy stock, latent establishment of pathogenic fungi in both roots and the growth substrate supported the hypothesis. Furthermore, seedling roots and the growth substrate were inhabited by distinct communities of fungi, and lifestyles of these fungi largely determined community segregation into particular ecological niche.
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| 9. |
- Pakade, Vusumzi, et al.
(author)
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Molecularly imprinted polymers targeting quercetin in high-temperature aqueous solutions
- 2012
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In: Journal of Chromatography A. - : Elsevier BV. - 0021-9673. ; 1230, s. 15-23
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Journal article (peer-reviewed)abstract
- Molecularly imprinted polymers (MIPs) targeting quercetin were prepared from 4-vinylpyridine and ethylene dimethacrylate (EDMA) under various solvent systems with the aim to form MIPs with high recognition for the quercetin molecule in aqueous systems at high temperature. A MIP prepared from the three-component solvent mixture of THF/H2O/MeOH showed potential in its application for the determination of quercetin in plants (onion). The polymer particles before and after washing were characterized by infrared spectroscopy and thermogravimetric analysis. Surface morphology was recorded by scanning electron microscopy. The binding capacity of the MIPs was investigated at 25 and 84 degrees C. respectively, in batch mode. Parameters, including the influence of pH, extraction time and binding capacity, were evaluated. The slopes for the effect of extraction time revealed that the mass transfer of the analytes was higher at 84 degrees C than at 25 degrees C. Also, the binding capacity for the most promising MIP and its corresponding NIP was higher at 84 degrees C. The binding capacity for the MIP was similar to 30 mu mol g(-1) at 25 degrees C and similar to 120 mu mol g(-1) at 84 degrees C, while for the corresponding NIP, it was similar to 15 and similar to 90 mu mol g(-1), at 25 and 84 degrees C, respectively. A demonstration of MIP selectivity at higher temperature using standard solutions of selected flavonols showed that the MIP still retained its selectivity for quercetin. Similar selectivity was observed when preliminary application studies on aqueous yellow onion extracts were investigated. (C) 2012 Elsevier B.V. All rights reserved.
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| 10. |
- Rohde, Mitchell M., et al.
(author)
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An Interactive, physics-based unmanned ground vehicle simulator leveraging open source gaming technology : Progress in the development and application of the virtual autonomous navigation environment (VANE) desktop
- 2009
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In: Unmanned Systems Technology XI. - Bellingham, WA : SPIE - International Society for Optical Engineering. - 9780819475985 ; , s. Article number 73321C-
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Conference paper (peer-reviewed)abstract
- It is widely recognized that simulation is pivotal to vehicle development, whether manned or unmanned. There are few dedicated choices, however, for those wishing to perform realistic, end-to-end simulations of unmanned ground vehicles (UGVs). The Virtual Autonomous Navigation Environment (VANE), under development by US Army Engineer Research and Development Center (ERDC), provides such capabilities but utilizes a High Performance Computing (HPC) Computational Testbed (CTB) and is not intended for on-line, real-time performance. A product of the VANE HPC research is a real-time desktop simulation application under development by the authors that provides a portal into the HPC environment as well as interaction with wider-scope semi-automated force simulations (e.g. OneSAF). This VANE desktop application, dubbed the Autonomous Navigation Virtual Environment Laboratory (ANVEL), enables analysis and testing of autonomous vehicle dynamics and terrain/obstacle interaction in real-time with the capability to interact within the HPC constructive geo-environmental CTB for high fidelity sensor evaluations. ANVEL leverages rigorous physics-based vehicle and vehicle-terrain interaction models in conjunction with high-quality, multimedia visualization techniques to form an intuitive, accurate engineering tool. The system provides an adaptable and customizable simulation platform that allows developers a controlled, repeatable testbed for advanced simulations. ANVEL leverages several key technologies not common to traditional engineering simulators, including techniques from the commercial video-game industry. These enable ANVEL to run on inexpensive commercial, off-the-shelf (COTS) hardware. In this paper, the authors d escribe key aspects of ANVEL and its development, as well as several initial applications of the system. © 2009 SPIE.
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