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15
Scratchpad sharing strategies for multiprocess embedded systems: A first approach
 in Proc. ESTMEDIA, 2005
"... Portable embedded systems require diligence in managing their energy consumption. Thus, power efficient processors coupled with onchip memories (e.g. caches, scratchpads) are the base of today’s portable devices. Scratchpads are more energy efficient than caches but require software support for thei ..."
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Portable embedded systems require diligence in managing their energy consumption. Thus, power efficient processors coupled with onchip memories (e.g. caches, scratchpads) are the base of today’s portable devices. Scratchpads are more energy efficient than caches but require software support for their utilization. Portable devices ’ applications consist of multiple processes for different tasks. However, all the previous scratchpad allocation approaches only consider single process applications. In this paper, we propose a set of optimal strategies to reduce the energy consumption of applications by sharing the scratchpad among multiple processes. The strategies assign both code and data elements to the scratchpad and result in average total energy reductions of 9%20 % against a published single process approach. Furthermore, the strategies generate Paretooptimal curves for the applications allowing design time exploration of energy/scratchpad size tradeoffs. 1.
Assessing risks and opportunities of technology infusion
 in system design, System Engineering
"... Most new technologies only deliver value once they are infused into a parent system. While the literature on innovation itself is abundant, there is a lack of understanding and methodology in terms of evaluating both the risks and opportunities of new technologies not in isolation, but in terms of ..."
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Most new technologies only deliver value once they are infused into a parent system. While the literature on innovation itself is abundant, there is a lack of understanding and methodology in terms of evaluating both the risks and opportunities of new technologies not in isolation, but in terms of their integration into a parent system in a wider regulatory and competitive context. This paper presents a technology infusion assessment methodology to quantify the potential performance benefits of new technologies using multiobjective Pareto analysis. Moreover, the costs of infusing new technologies are also considered using the concept of architectural invasiveness relative to a baseline system. The degree of invasiveness of different system architectures is related to the amount of design change required to accommodate the new technology. This is quantified with a componentbased change Design Structure Matrix (DSM). Risks and opportunities are quantified by evaluating the utility of future benefits and costs of a new technology against uncertain exogenous variables such as gains made by competing technologies and potential future regulatory actions. The technology infusion methodology is demonstrated for a hydrogenenhanced combustion engine, where the effects of integrating a plasma fuel reformer are quantified and discussed in terms of fuel economy, NOx emissions, and addon vehicle costs. The methodology is generally
Comparison of sensitivity to color changes in natural and phasescrambled scenes
 Journal of the Optical Society of America A
, 2008
"... Traditionally, thresholds for detecting photometric changes have been measured by using stimuli such as disks or gratings and accounted for in terms of relatively lowlevel mechanisms in the visual pathway. Therefore one might not expect the higherorder structures that characterize natural scenes t ..."
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Traditionally, thresholds for detecting photometric changes have been measured by using stimuli such as disks or gratings and accounted for in terms of relatively lowlevel mechanisms in the visual pathway. Therefore one might not expect the higherorder structures that characterize natural scenes to influence thresholds for detecting uniform photometric changes. We compared thresholds for detecting uniform photometric changes for natural and phasescrambled versions of images of natural scenes. The chromaticity and luminance of every pixel was represented as a vector in a modified version of the MacLeod–Boynton color space and was translated, rotated, or compressed within that color space. Thresholds for all types of transformation were significantly lower in the raw compared with phasescrambled scenes, and we attribute this to the influence of
Applications of Static Analysis and Program Structure in Statistical Debugging
, 2012
"... i ii ..."
Evaluating the Complexity of Mathematical Problems. Part 1
, 2009
"... In this paper we provide a computational method for evaluating in a uniform way the complexity of a large class of mathematical problems. The method, which is inspired by NKS1, is based on the possibility to completely describe complex mathematical problems, like the Riemann hypothesis, in terms of ..."
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In this paper we provide a computational method for evaluating in a uniform way the complexity of a large class of mathematical problems. The method, which is inspired by NKS1, is based on the possibility to completely describe complex mathematical problems, like the Riemann hypothesis, in terms of (very) simple programs. The method is illustrated on a variety of examples coming from different areas of mathematics and its power and limits are studied.
Predicting Improper Fractional Base Integer Characteristics
"... Combinatorics and algebra have been used to find equations for the smallest integer with a certain length in an integral base. However, improper fractional bases have not been explored in much depth since their discovery in the 1930s. In this study, I discovered an original formula for the smallest ..."
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Combinatorics and algebra have been used to find equations for the smallest integer with a certain length in an integral base. However, improper fractional bases have not been explored in much depth since their discovery in the 1930s. In this study, I discovered an original formula for the smallest integer with a specific digit length in an improper fractional base. I wrote an original computer program to convert integers from base 10 to any improper fractional base. I used this program to find 100 combinations of length, improper fractional base, and the smallest integer with that length in that fractional base. I used graphing, combinatorics, and difference equations to attempt to find a method to predict the smallest integer with a specific length in an improper fractional base. I then used number theory to evaluate the divisibility requirements
IEEE Control Systems Magazine
"... he efficient and safe operation of large fusion devices relies on accurate knowledge of the position and shape of the plasma column inside the vacuum chamber. There are several reasons for optimizing plasma shape and position, namely, to maintain adequate clearance from the chamber wall to avoid h ..."
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he efficient and safe operation of large fusion devices relies on accurate knowledge of the position and shape of the plasma column inside the vacuum chamber. There are several reasons for optimizing plasma shape and position, namely, to maintain adequate clearance from the chamber wall to avoid high densities of power and particle deposition, to be sufficiently close to the wall to ensure adequate passive stabilization, to achieve efficient radio frequency (RF) heating by maximizing antenna coupling (see “Tutorial 9”), and finally, to reduce magnetohydrodynamic (MHD) activity (see “Tutorial 2 ” in [1]). Unfortunately, plasma shape is not a directly measurable quantity and thus can only be evaluated using diagnostic data, such as the magnetic measurements of flux and field. Current trends in existing fusion plants, as well as operating scenarios envisioned for future tokamaks, present the control engineer with the challenge of regulating highly unstable, strongly shaped plasmas with precision and reliability. Therefore, whether to improve fusion performance or to protect the machine components, the problem of reconstructing the plasma boundary is critical for both diagnostic and control purposes. In this respect, shape estimation assumes a key role in fulfilling the requirements for realtime applications.
Mathematical Problems. Part 1 ∗
, 2008
"... In this paper we provide a computational method for evaluating in a uniform way the complexity of a large class of mathematical problems. The method is illustrated on a variety of examples coming from different areas of mathematics and its power and limits are studied. 1 ..."
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In this paper we provide a computational method for evaluating in a uniform way the complexity of a large class of mathematical problems. The method is illustrated on a variety of examples coming from different areas of mathematics and its power and limits are studied. 1
On the Detection of FrequencySpectraBased Chipless RFID Using UWB Impulsed Interrogation
"... Abstract—A novel approach is presented to accurately estimate the resonant features of a multipatch backscatterbased chipless radio frequency identification (RFID) tag. An ultrawideband impulse radar (UWBIR)based reader interrogates the chipless tag with a UWB pulse, and the received backscatter ..."
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Abstract—A novel approach is presented to accurately estimate the resonant features of a multipatch backscatterbased chipless radio frequency identification (RFID) tag. An ultrawideband impulse radar (UWBIR)based reader interrogates the chipless tag with a UWB pulse, and the received backscatter is analyzed in thetimedomain.Thekeycomponents constituting the backscattered signal, the structural mode, and the antenna mode are identified, and their spectral content are analyzed. Analysis shows that the antenna mode backscatter contains the information carrying signal while the structural mode backscatter contains no information about the tag. A semianalytical model is developed to explain the behavior of the signal backscattered from the chipless RFID tag. Simulation and semianalytical results are validated by experimental measurements obtained in an anechoic chamber environment using a 4b multipatch chipless RFID tag. The new method does not rely on calibration tags for operation and has a greater degree of freedom in the orientation of tags with respect to a reader. A novel method, selective spectral interrogation (SSI), that uses a set of interrogation pulses to extract information bits stored in the spectral signature of the chipless tag is also introduced. Index Terms—Backscatter, chipless radio frequency identification (RFID), ultrawideband impulse radar (UWBIR), time domain. I.
EndToEnd Distance Computation In Grid Environment by NDS, the Network Distance Service
"... This article presents a novel method for computing distances between hosts in a computational Grid. Our method allows to represent the cost to achieve any operation involving some services in a Grid environment. We demonstrate why the current monitoring tools are not sufficient in grid environment ..."
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This article presents a novel method for computing distances between hosts in a computational Grid. Our method allows to represent the cost to achieve any operation involving some services in a Grid environment. We demonstrate why the current monitoring tools are not sufficient in grid environments that lack high level tools to combine several sources of monitoring while taking into account particular constraints for some given applications. We show how this method has been embedded in a Grid service, namely the Network Distance Service (NDS). We illustrate the benefit of our approach in terms of accuracy, using an algorithm from graph theory on a grid planning scenario. We explain some implementation issues and discuss how the proposed NDS service can be useful to any grid service who needs some accurate evaluation for a decision making process involving such distances. 1 1