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21 results on '"Nelissen, G."'

1. Response-Time Analysis for Self-Suspending Tasks Under EDF Scheduling

Author

Aromolo, F., Biondi, A., and Nelissen, G.

Subjects
Software_OPERATINGSYSTEMS, Computer systems organization → Real-time systems, Software and its engineering → Real-time schedulability, Schedulability Analysis, EDF Scheduling, ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS, Real-Time Systems, Self-Suspending Tasks
Abstract

The self-suspending task model proved to be particularly effective in capturing the timing behavior of real-time systems characterized by complex execution patterns, such as computation offloading to hardware accelerators, inter-core synchronization by means of multiprocessor locking protocols, and highly parallel computation. Most of the existing results for the timing analysis of self-suspending tasks do not support the widely adopted Earliest Deadline First (EDF) scheduling algorithm, being instead primarily focused on fixed-priority scheduling. This paper presents a response-time analysis for constrained-deadline self-suspending tasks scheduled under EDF on a uniprocessor system. The proposed analysis is based on a model transformation from self-suspending sporadic tasks to sporadic tasks with jitter, which can then be analyzed using a state-of-the-art analysis method for EDF scheduling. Experimental results are presented to compare the performance of the proposed technique in terms of schedulability ratio with that of the pessimistic suspension-oblivious approach and with a less general technique for task sets with implicit deadlines., LIPIcs, Vol. 231, 34th Euromicro Conference on Real-Time Systems (ECRTS 2022), pages 13:1-13:18

Published
2022
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11. Poster Presentations

Author

Mitra, A., Walker, S. A., Bayer, I., Pickovsky, B., Cohen, S. M., Schmitt, S. L., Lucas, F. L., Wexner, S. D., Szilagy, E. J., Ryan, J. B., Williams, J. G., Deen, K. I., Grant, E., Kumar, D., Wiltz, O. H., Garcia, J. E., Feliciano, R., Martino, J., Solomon, M., McLeod, R. S., O'Connor, B., Steinhart, H., Greenberg, G., Cohen, Z., Meagher, A. P., Adams, W. J., Lubowski, D. Z., Ellis, C. N., Boggs, H. W., Coyle, D. J., Blakemore, W. S., Nahas, S. C., Ibrahim, R. El, Pinotti, H. W., Palakanis, K., DeNobile, J., Sweeney, B., Blankenship, C., Sun, J. H., Stiegmann, G. V., Kim, J. G., Pearlman, N. W., Landes, R. V., Hankin, R. C., Barkel, D. C., Beauregard, W. L., Poulik, M. D., Chen, J. C., Dmuchowski, C., Cho, E., Lee, P. Y., Fletcher, W. S., Sullivan, E. S., Vetto, J. T., Hull, T. L., Lavery, I. C., Saxton, J. P., McCue, J., Sheffield, J., Phillips, R., DiPierro, J., Milsom, J. W., Fazio, V. W., Strong, S. A., Vernava, III, A. M., Longo, W. E., Wade, T. P., Virgo, K. S., Coplin, M. A., Johnson, F. E., Cavina, E., Menconi, C., Ghiselli, G., Seccia, M., Tjandra, J. J., Lowndes, R., McKirdy, H., Schroeder, T., Hughes, L. E., Sentovich, S. M., Rivela, L. J., Thorson, A. G., Blatchford, G. J., Christensen, M. A., Jensen, L. L., Lowry, A. C., Miller, R., Mills, A., Durdey, P., Hock-Saive, D., Lombard, R., Jehaes, C., Markiewicz, S., Penders, L., Fontaine, F., Cusumano, P., Nelissen, G., MacDonald, A., Baxter, J. N., Bessent, R. G., Gray, H. W., Finlay, I. G., Duthie, G. S., Farouk, R., Bartolo, D. C. C., Ramanujam, P. S., Venkatesh, K. S., Oliver, G. C., Vachon, D., Eisenstat, T. E., Rubin, R. J., Salvati, E. P., Dorsey-Tyler, K. R., Harmon, G., Medwell, S. J., Binderow, S. R., Noguerás, J. J., Jagelman, D. G., Decanini, C., Bohm, B., Stolfi, V. W., Cataldo, P. A., Hadick, C., Resnikov, P., Mellinger, J. D., Cunningham, B., Vayer, Jr., A. J., Larach, S. W., Williamson, P. R., Ferrara, A., Salomon, M., Nogueras, J. J., Sullivan, J., Staniunas, R. J., Keck, J. O., Counihan, T., Marcello, P., Barrett, R. C., Oster, M., Roberts, P. L., Schoetz, D. J., Murray, J. J., Veidenheimer, M. C., Coller, J. A., Sagar, P. M., Lewis, W., Williamson, M., Holdsworth, P. J., Johnston, D., Jorge, J. M. N., Morgado, Jr., P. J., James, K., Morgado, Jr., P., Penna, C., Kartheuser, A., Tiret, E., Parc, R., McIntyre, P. B., Pemberton, J. H., Wolff, B. G., Dozois, R. R., Beart, R. W., Kelley, K. A., Harrison, J. B., Hockenberry, S. E., Williamson, M. E. R., Lewis, W. G., Sagar, P., Armstrong, D. N., Collopy, B. C., Ryan, P. J., Fink, R., Mackay, J. R., Woods, R. J., Nazarian, H. K., Kong, L. B., Fleshner, P. R., Keighley, M. R. B., Farmakis, N., Tudor, R., Wiltz, O., Wong, W. D., Goldberg, S. M., Rothenberger, D. A., Arnold, M. W., Schneebaum, S., Martin, Jr., E. W., Young, D. C., Schechter, S., Snyder, M. L., Orkin, B. A., Smith, L. E., Dean, P. A., Ramsey, P. S., Nelson, H., Barker, G., Neoptolomos, J. P., Patel, R. T., Pall, A., and Adu, D.

Published
1993
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12. On Strong and Weak Sustainability, with an Application to Self-Suspending Real-Time Tasks

Author

Cerqueira, F., Nelissen, G., and Brandenburg, B.

Subjects
000 Computer science, knowledge, general works, Computer Science
Abstract

Motivated by an apparent contradiction regarding whether certain scheduling policies are sustainable, we revisit the topic of sustainability in real-time scheduling and argue that the existing definitions of sustainability should be further clarified and generalized. After proposing a formal, generic sustainability theory, we relax the existing notion of (strongly) sustainable scheduling policy to provide a new classification called weak sustainability. Proving weak sustainability properties allows reducing the number of variables that must be considered in the search of a worst-case schedule, and hence enables more efficient schedulability analyses and testing regimes even for policies that are not (strongly) sustainable. As a proof of concept, and to better understand a model for which many mistakes were found in the literature, we study weak sustainability in the context of dynamic self-suspending tasks, where we formalize a generic suspension model using the Coq proof assistant and provide a machine-checked proof that any JLFP scheduling policy is weakly sustainable with respect to job costs and variable suspension times.

Published
2018
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17. Numerical model for predicting the efficiency behaviour during pulsed electrochemical machining of steel in NaNO3.

Author

Van Damme, S., Nelissen, G., Van Den Bossche, B., and Deconinck, J.

Subjects
MACHINING, ELECTROCHEMICAL cutting, METAL cutting, STEEL, ELECTROLYTES, ANODES, MANUFACTURING processes
Abstract

A new two-dimensional model is presented that allows describing the high speed electrochemical machining of steel in NaNO3 solutions. Unlike existing models, local ion concentrations are calculated and used to evaluate local diffusion coefficients and electrolyte conductivity. Secondly, the presence of a super-saturated, honey-like layer on the anode surface is accounted for by introducing a water depletion factor. This factor describes the suppression of the oxygen evolution as the vast increase in ion concentrations reduces the amount of free water molecules at the anode. It is demonstrated that this approach enables to reproduce experimental average efficiency curves over a broad range of electrolyte concentrations with just a limited set of adjustable parameters. [ABSTRACT FROM AUTHOR]

Published
2006
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18. Design and Validation of Conformal Anodes for a Thermal Barrier Coating on a Triple Vane.

Author

Nelissen, G., Van den Bossche, B., Rose, A., and Foster, J.

Subjects
ANODES, METAL coating, BLADES (Hydraulic machinery), ELECTROPLATING, COMPUTER-aided engineering
Abstract

Thermal barrier coatings (TBCs) are layered systems deposited on thermally highly loaded metallic components such as high pressure turbine blades or nozzle guide vanes in gas turbines. TKIBOMET® MCrALY coatings are Praxair Surface Technologies' unique electrodeposited version of the high temperature oxidation and corrosion resistant MCrAly coating and typically contain "metal" (nickel/cobalt) chromium- aluminum-yttrium and other active elements. Praxair's MCrALY coatings are produced by the carefully controlled co-deposition of CrALY powder with nickel and/or cobalt from conventional electroplating baths. This is later followed by vacuum heat treatment to produce the MCrALY alloy coating. To date, design of the electroplating configuration is largely a combination of experiential and empirical approaches often consuming substantial labor and lead time. This paper describes how Flsyca's newly developed CAM tools were used to assess and guide the design of a conformal anode system with the objective of achieving a very uniform deposit on a triple vane configuration. The simulations are validated with experimental deposit thickness measurements on the actual parts and a very good agreement is observed for all test points on the triple vanes. From this it can be concluded that simulations are a relevant and very powerful tool to design complex plating configurations. Implementing such a digital manufacturing approach can significantly reduce labor costs in reaching an optimum tooling design, resulting in a reduction in time to market and time to revenue. [ABSTRACT FROM AUTHOR]

Published
2008

20. Strategy for RSA migration thresholds.

Author

Pijls, Bart G., Nelissen, G. H. H., Molt, Mats, Ryd, Leif, and Toksvig-Larsen, Sören

Subjects
*ORTHOPEDIC surgery, *TIBIA, *RADIOSTEREOMETRY
Abstract

A letter is presented in response to the article "A randomized RSA study concentrating especially on continuous migration" by M. Molt and others, in a 2016 issue.

Published
2016
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21. Numerical investigation of transient current density distributions for multi-ion electrolytes at a rotating disk electrode.

Author

Floridor G, Van den Bossche B, Nelissen G, Bortels L, and Deconinck J

Abstract

A versatile model for the simulation of transient multiion transport and reaction processes is applied to investigate current density distributions over a rotating disk electrode for linear voltammetric sweep experiments. The model accounts for ion transport by convection, diffusion, and migration, in combination with Butler-Volmer type electrode reactions. For several process conditions (reversible and irreversible reactions, excess or lack of supporting electrolyte), the current density distribution over the disk surface is examined and the transient current response is compared to results from the more commonly used one-dimensional axial approach. The impact of migrational effects on the nonuniform local process conditions over the disk surface is illustrated, and the resulting effect on the current peak height, width, and position is investigated. A mathematical correlation for the current peak height as a function of the reacting ion transference number is established.

Published
2004
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