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SystemC is a new open source library in C++ for developing cycle-accurate or more abstract models of software algorithms, hardware architecture and system-level designs. SystemC is meant to be an ...interoperable, modeling platform allowing seamless tool integration. Our objective is to evaluate the feasibility of linking a third party software to SystemC without modifying the SystemC source. We chose the development of a GUI as such an application. This application illustrates a set of applications following the observer pattern defined recently in software engineering. This class of applications can be loosely coupled to a platform designed following specific rules of software reuse.
The need to increase power flows is forcing electric power companies to consider the rapid determination of transfer and security limits in energy management centers. At the present time, transient ...stability transfer limits are generally calculated off‐line due to the limitations of numerical computers. This paper introduces an innovative approach for simulating transient stability based on the use of a new type of chip technology designed for real‐time image processing. Power system equations in matrix form are solved by means of rapid matrix operation techniques on the PULSE (parallel ultra large scale engine) technology, resulting in outstanding low cost performance. This paper confirms the efficiency of this approach on the 9 bus Western Systems Coordinating Council (WSCC) test power system. Simulation results based on a preliminary version of the PULSE technology clearly indicate that economic, faster than real‐time transient stability simulation is feasible for large networks.
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Tone-mapping (TM) aims to adapt high dynamic range images to conventional display devices. TM algorithms are usually implemented on general purpose processors and graphics processing units. Such ...platforms may not meet performance, area, power and flexibility constraints imposed by the embedded system domain. This paper presents the design and implementation of a customized processor for a global TM algorithm. Using an architecture description language, three custom instructions to calculate luminance, logarithm and maximum luminance were added to a 32-bit RISC-based processor. The logarithm was computed using an improved Mitchell approximation. Experimental results demonstrate a 169% performance improvement when adding all three instructions, with a hardware overhead of only 22%.
Nowadays, designing systems using soft-core processors on FPGA is gaining in popularity and methodologies must arise to fulfill this new reality. This paper presents different techniques to develop ...instruction set simulators and its supportive components with SystemC to enable a fast FPGA development methodology without totally sacrificing the accuracy of the simulation. We have developed the Xilinx Microblaze software environment using ESL concepts at different abstractions to explore cycle accuracy versus simulation performance trade-offs. Results show that the low-level ESL model, while slower, is 6.8 times more accurate on average than the high-level model and as close as 3% from an on-FPGA execution. Conclusion tells us that a high-level model is thus appropriate for fast prototyping and debugging, while a lower-level model is more appropriate for performance estimation.
La très intéressante note de John Day est centrée sur un problème fondamental : celui de la formation des prix dans l'économie européenne des deux derniers siècles du Moyen Age. Elle comporte deux ...aspects distincts. Le premier est critique ; il s'agit de réfuter les principales interprétations (non monétaristes) qui ont pu être données du mouvement long des prix, soit dans une perspective malthusienne (par M. M. Postan notamment), soit dans une perspective marxiste (par moi-même). Le second est positif : J. Day, après W. C. Robinson et E. J. Hamilton, nous propose une explication monétaire, la dépression séculaire des prix étant à ses yeux la conséquence directe de la grave famine monétaire à laquelle il a d'ailleurs consacré un article récent et important. Arrêtons-nous successivement à chacun de ces deux aspects.
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