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Search Results: 1 - 10 of 15036 matches for " Christian Schuck "
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An Interface for a Decentralized 2D Reconfiguration on Xilinx Virtex-FPGAs for Organic Computing
Christian Schuck,Bastian Haetzer,Jürgen Becker
International Journal of Reconfigurable Computing , 2009, DOI: 10.1155/2009/273791
Abstract: Partial and dynamic online reconfiguration of Field Programmable Gate Arrays (FPGAs) is a promising approach to design high adaptive systems with lower power consumption, higher task specific performance, and even build-in fault tolerance. Different techniques and tool flows have been successfully developed. One of them, the two-dimensional partial reconfiguration, based on the Readback-Modify-Writeback method implemented on Xilinx Virtex devices, makes them ideally suited to be used as a hardware platform in future organic computing systems, where a highly adaptive hardware is necessary. In turn, decentralisation, the key property of an organic computing system, is in contradiction with the central nature of the FPGAs configuration port. Therefore, this paper presents an approach that connects the single ICAP port to a network on chip (NoC) to provide access for all clients of the network. Through this a virtual decentralisation of the ICAP is achieved. Further true 2-dimensional partial reconfiguration is raised to a higher level of abstraction through a lightweight Readback-Modify-Writeback hardware module with different configuration and addressing modes. Results show that configuration data as well as reconfiguration times could be significantly reduced.
Reconfiguration Techniques for Self-X Power and Performance Management on Xilinx Virtex-II/Virtex-II-Pro FPGAs
Christian Schuck,Bastian Haetzer,Jürgen Becker
International Journal of Reconfigurable Computing , 2011, DOI: 10.1155/2011/671546
Abstract: Xilinx Virtex-II family FPGAs support an advanced low-skew clock distribution network with numerous global clock nets to support high-speed mixed frequency designs. Digital Clock Managers in combination with Global Clock Buffers are already in place to generate the desired frequency and to drive the clock networks with different sources, respectively. Currently, almost all designs run at a fixed clock frequency determined statically during design time. Such systems cannot take the full advantage of partial and dynamic self-reconfiguration. Therefore, we introduce a new methodology that allows the implemented hardware to dynamically self-adopt the clock frequency during runtime by reconfiguring the Digital Clock Managers. We also present a method for online speed monitoring which is based on a two-dimensional online routing. The created speed maps of the FPGA area can be used as an input for the dynamic frequency scaling. Figures for reconfiguration performance and power savings are given. Further, the tradeoffs for reconfiguration effort using this method are evaluated. Results show the high potential and importance of the distributed dynamic frequency scaling method with little additional overhead. 1. Introduction Xilinx Virtex FPGAs have been designed with high-performance applications in mind. They feature several dedicated Digital Clock Managers (DCMs) and Digital Clock Buffers for solving high-speed clock distribution problems. Multiple clock nets are supported to enable highly heterogeneous mixed frequency designs. Usually all clock frequencies for the single clock nets and the parameters for the DCMs are determined during design time through static timing analysis. Targeting maximum performance these parameters strongly depend on the longest combinatorial path (critical path) between two storage elements. For minimum power the required throughput of the design unit determines the lower boundary of the possible clock frequency. In both cases nonadjusted clock frequencies lead to waste of either processing power or energy [1, 2]. Considering the feature of partial and dynamic self-reconfiguration of Xilinx Virtex FPGAs, during runtime a high dynamic and flexibility arises. Static analysis methods are no longer able to sufficiently determine an adjusted clock frequency during design time. At the same time a new partial module is reconfigured onto the FPGA grid, its critical path changes, and in turn the clock frequency has to be adjusted as well during runtime to fit the new critical path. On the other side the throughput requirement of the
Alpha-Particle condensation in nuclear systems: present status and perspectives
P. Schuck
Physics , 2013, DOI: 10.1088/1742-6596/436/1/012065
Abstract: Alpha clustering and alpha condensation in lighter nuclei is presently strongly and increasingly discussed in the literature both from the experimental side as from the theoretical one. A discussion of the present status of the theory as well as outlooks for future developements will be presented.
Study protocol of the German "Registry for the Detection of Late Sequelae after Radiotherapy in Childhood and Adolescence" (RiSK)
Tobias Bolling, Andreas Schuck, Hildegard Pape, Christian Rube, Barbara Pollinger, Beate Timmermann, Rolf D Kortmann, Karin Dieckmann, Normann Willich
Radiation Oncology , 2008, DOI: 10.1186/1748-717x-3-10
Abstract: Radiation parameters including detailed organ doses as well as toxicity evaluations are collected prospectively from centres all over Germany. Standardized documentation forms are used. These forms are given in an English and German version as additional files to this publication. Documentation is planned for all children who receive radiotherapy in one of the therapy trials of the "German Society of Paediatric Oncology and Haematology (GPOH)". The study started in a pilot phase in June 2001 in few centres. Since 2004 documentation has been performed all over Germany and is still on-going.To our knowledge, "RiSK" is the only multi-centre study that evaluates radiation associated side effects prospectively with detailed information about organ dose levels. With ongoing recruitment and prolongation of follow-up powerful data will be obtained in a few years. A broad use and international cooperation are welcome.Radiotherapy is of fundamental importance in paediatric oncology. Individual decisions for the use of ionizing radiation always have to consider the potential benefit and possible side effects. Whereas the benefit is no matter of major discussions, the risk for potential side effects like secondary malignancies and non-cancer health effects cannot be quantified based on sufficient data. Especially, there is a lack of information regarding dose-effect relationships of ionizing radiation. This is of special importance when ionizing radiation is used in childhood and adolescence due to potential higher vulnerability of growing tissue and longer expected life span [1-3]. For radiotherapy, late effects after treatment in childhood and adolescence have mainly been characterized retrospectively with small patient numbers [4-7]. Many of these analyses are limited due to little information about organ dose levels and older radiation techniques in some cases. Recently, the characterization of late effects after cancer therapy in childhood including chemotherapy, surgery a
?El éxito del viejo o del nuevo hacer?: Las prácticas evaluativas en tres escuelas municipa?es de educación básica de Coyaique, región de Aysén, Chile
Magallania (Punta Arenas) , 2012, DOI: 10.4067/S0718-22442012000200006
Abstract: educational evaluation is subject to discussion in all latin-american countries, and in this consideration we have sought to analyze the characteristics shown by the assessment systems used in three public schools of basic level education (emeb) of the city of coyhaique, aysén region - chile, and especially if they promote what is proposed by the ministry of education in regard to school evaluation.
El éxito del viejo o del nuevo hacer?: Las prácticas evaluativas en tres escuelas municipa es de educación básica de Coyaique, región de Aysén, Chile Success in the old or new way of doing?: Assessment practices in three basic level public education school of Coyhaique, Aisén region, Chile
Magallania , 2012,
Abstract: Se entiende que la Evaluación Educacional es tema de discusión en todos los países de América Latina, y en este marco se ha buscado analizar las características que presentan las evaluaciones realizadas en tres escuelas municipales de educación básica (EMEB) de la comuna de Coyhaique, Región de Aysén - Chile, y en especial, si las mismas promocionan lo que es planteado por el Ministerio de Educación en lo que se refiere a la evaluación escolar. Educational Evaluation is subject to discussion in all Latin-American countries, and in this consideration we have sought to analyze the characteristics shown by the assessment systems used in three public schools of basic level education (EMEB) of the city of Coyhaique, Aysén Region - Chile, and especially if they promote what is proposed by the Ministry of Education in regard to school evaluation.
A modernidade diante do problema do conhecimento
Rogério José Schuck
Poiésis , 2011,
Abstract: The text is divided into two parts, the first one opens the discussion of truth with theTheory of Scientific Knowledge, identifying internal limits to the modern pretension. The knowledgeconstruction perspective through modernity brought tremendous benefits to the mankind. On theother side, it brought the growing omnipotent pretension of the human reason, that seeks in sciencethe answers to all the questions of the human being. It is a model of knowledge construction that isclaiming the status of a model par excellence in knowledge construction, taken as a result of anobjectifying act of thinking. The second part discusses that criticism has grown contemporaneously insuch a way to relate itself to knowledge, that seeks in the post-cartesian notion of knowledge theomnipotent rational subject, who wants to have the primacy of thought, as exclusive, in theproduction of knowledge. The criticism that arises is precisely in this contradiction, in realizing thatsuch a model cannot respond for its assumptions, this is, the realm of reason on the totality ofknowledge. Thus, conditions arise to reflect on a new knowledge, based on the question of thetradition appropriation that in an educational context refers to the expectation of overcoming suchlimits.
The Significance of Diagnostic Data for the Process of Fostering by the Center for Educational Support in Hamburg
Karl Dieter Schuck
Empirische Sonderp?dagogik , 2011,
Abstract: Strategies and methods of diagnostics and assessment which are applied in the Hamburg concept of the Center of educational support in integrative environments are determined concerning their quality. Varied connections were found between the results of diagnostics and assessment and educational decision making. In addition it becomes clear that the importance of diagnostics and assessment in the concept of the Center of educational support in integrative environments is overestimated. It is argued the case for changing fundamentally the diagnostic strategy, which has been practiced at the beginning of compulsory school attendance and primarily serves to obtain educational resources, to the effect that all the children with special educational needs are taken into account or even for giving up this strategy in favour to promote evaluative diagnostics and assessment accompanying and forming the learning process.
Pair-Breaking in Rotating Fermi Gases
Michael Urban,Peter Schuck
Physics , 2008, DOI: 10.1103/PhysRevA.78.011601
Abstract: We study the pair-breaking effect of rotation on a cold Fermi gas in the BCS-BEC crossover region. In the framework of BCS theory, which is supposed to be qualitatively correct at zero temperature, we find that in a trap rotating around a symmetry axis, three regions have to be distinguished: (A) a region near the rotational axis where the superfluid stays at rest and where no pairs are broken, (B) a region where the pairs are progressively broken with increasing distance from the rotational axis, resulting in an increasing rotational current, and (C) a normal-fluid region where all pairs are broken and which rotates like a rigid body. Due to region B, density and current do not exhibit any discontinuities.
Surface properties of nuclear pairing with the Gogny force in a simplified model
M. Farine,P. Schuck
Physics , 1999, DOI: 10.1016/S0370-2693(99)00667-X
Abstract: Surface properties of neutron-neutron (T=1) pairing in semi-infinite nuclear matter in a hard wall potential are investigated in BCS approximation using the Gogny force. Surface enhancement of the gap function, pairing tensor and correlation energy density is put into evidence.
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