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1 Pascucci, ValerioConforming Morse-Smale complexesMorse-Smale (MS) complexes have been gaining popularity as a tool for feature-driven data analysis and visualization. However, the quality of their geometric embedding and the sole dependence on the input scalar field data can limit their applicability when expressing application-dependent features....2014-01-01
2 Pascucci, ValerioThe parallel computation of morse-smale complexesTopology-based techniques are useful for multi-scale exploration of the feature space of scalar-valued functions, such as those derived from the output of large-scale simulations. The Morse-Smale (MS) complex, in particular, allows robust identification of gradient-based features, and therefore is s...2012-01-01
3 Regehr, JohnSome guidelines for proportional share CPU scheduling in general-purpose operating systemsOur premise is that since there already exists a large, mature body of literature on real-time scheduling in general-purpose operating systems, it is time to spend more effort deciding which of these algorithms should be used and when, and less effort on generating new algorithms. In this paper we f...2001-01-01
4 Regehr, JohnInferring scheduling behavior with hourglassAlthough computer programs explicitly represent data values, time values are usually implicit. This makes it difficult to analyze and debug real-time programs whose correctness depends partially on the time at which results are computed. This paper shows how to use Hourglass, an instrumented, synthe...2002-01-01
5 Regehr, JohnAugmented CPU reservations: towards predictable execution on general-purpose operating systemsOne problem with performing soft real-time computations on general-purpose operating systems is that these OSs may spend significant amounts of time in the kernel instead of performing work on behalf of the application that is nominally scheduled: the OS effectively steals time from the running appl...2001-01-01
6 Pascucci, ValerioComputing morse-smale complexes with accurate geometryTopological techniques have proven highly successful in analyzing and visualizing scientific data. As a result, significant efforts have been made to compute structures like the Morse-Smale complex as robustly and efficiently as possible. However, the resulting algorithms, while topologically consis...2012-01-01
7 Gopalakrishnan, GaneshSpecification-driven design of custom hardware in HOPWe present a language "Hardware viewed as Objects and Processes" (HOP) for specifying the structure, behavior, and timing of hardware systems. HOP embodies a simple process model for lock-step synchronous processes. Processes may be described both as a black-box and as a collection of interacting s...HOP; hardware systems; Structure; Behavior; Timing; custom hardware1988
8 Regehr, JohnDynamic CPU management for real-time, middleware-based systemsMany real-world distributed, real-time, embedded (DRE) systems, such as multi-agent military applications, are built using commercially available operating systems, middleware, and collections of pre-existing software. The complexity of these systems makes it difficult to ensure that they maintain h...2004-01-01
9 Hansen, Charles D.; Henderson, Thomas C.CAGD based 3-D visual recognitionA coherent automated manufacturing system needs to include CAD/CAM, computer vision, and object manipulation. Currently, most systems which support CAD/CAM do not provide for vision or manipulation and similarly, vision and manipulation systems incorporate no explicit relation to CAD/CAM models. CAD...Visual recognition; Computer Aided Geometric Design (CAGD)1986
10 Kopta, Daniel M.; Kensler, Andrew Erin; Spjut, Josef Bo; Brunvand, Erik L.; Davis, AlFast, effective BVH updates for dynamic ray-traced scenes using tree rotationsBounding volume hierarchies are a popular choice for ray tracing animated scenes due to the relative simplicity of refitting bounding volumes around moving geometry. However, the quality of such a refitted tree can degrade rapidly if objects in the scene deform or rearrange significantly as the ...Ray tracing; Acceleration structures; Bounding volume hierarchies; Tree rotations; Dynamic scenes; Parallel update2011
11 Boll, Steven F.Selected methods for improving synthesis speech quality using linear predictive coding: system description, coefficient smoothing and streakThis report develops two generalizations of the standard Linear Predictive Coding (LPC) implementation of a narrow band speech compression system. The purpose of each method is to improve the speech quality that is available from a standard LPC system.Linear Predictive Coding; LPC; Speech compression system; Pitch excited system1974
12 Schaelicke, LambertProfiling I/O interrupts in modern architecturesAs applications grow increasingly communication-oriented, interrupt performance quickly becomes a crucial component of high performance I/O system design. At the same time, accurately measuring interrupt handler performance is difficult with the traditional simulation, instrumentation, or statistica...1999
13 Slind, Konrad LeeEmerging trends proceedings of the 17th International Conference on Theorem Proving in Higher Order Logics: TPHOLs 2004This volume constitutes the proceedings of the Emerging Trends track of the 17th International Conference on Theorem Proving in Higher Order Logics (TPHOLs 2004) held September 14-17, 2004 in Park City, Utah, USA. The TPHOLs conference covers all aspects of theorem proving in higher order logics ...Theorem proving; Higher order logics2004-08
14 Gopalakrishnan, GaneshHOP: a process model for synchronous hardware semantics, and experiments in process compositionWe present a language "Hardware viewed as Objects and Processes" (HOP) for specifying the structure, behavior, and timing of hardware systems. HOP embodies a simple process model for lock-step synchronous processes. An absproc specification written in HOP describes the externally observable behavior...HOP; Synchronous hardware semantics1988
15 Kirby, Robert Michael II; Johnson, Christopher R.A new family of variational-form-based regularizers for reconstructing epicardial potentials from body-surface mappingWe propose a new family of regularizers for the inverse ECG problem, using a variational principle that underlies finite element approximation methods. As an alternative to traditional Tikhonov regularizers, the variational formulation has several advantages: 1)it enables a simple construction of ...2010
16 Eide, Eric Norman; Regehr, John; Lepreau, JayDynamic CPU management for real-time, middleware-based systemsMany real-world distributed, real-time, embedded (DRE) systems, such as multi-agent military applications, are built using commercially available operating systems, middleware, and collections of pre-existing software. The complexity of these systems makes it difficult to ensure that they maintai...CPU management2004-01-30
17 Regehr, JohnUsing hierarchical scheduling to support soft real-time applications in general-purpose operating systemsThe CPU schedulers in general-purpose operating systems are designed to provide fast response time for interactive applications and high throughput for batch applications. The heuristics used to achieve these goals do not lend themselves to scheduling real-time applications, nor do they meet other s...2001-01-01
18 Christiansen, Richard WesleyWord recognition in continuous speech using linear prediction analysisA promising method of automatic word recognition in continuous speech, recently designated as word spotting, has been demonstrated. The method uses error residual ratios from LPC (Linear Predictive Coding) vocoder analysis for waveform comparison and a dynamic programming procedure for time regist...Word recognition; continuous speech; linear prediction analysis; word spotting; error residual ratios; LPC; Linear Predictive Coding; vocoder analysis1976
19 Regehr, JohnHLS: a framework for composing soft real-time schedulersHierarchical CPU scheduling has emerged as a way to (1) support applications with diverse scheduling requirements in open systems, and (2) provide load isolation between applications, users, and other resource principals. Most existing work on hierarchical scheduling has focused on systems that prov...2001-01-01
20 Balasubramonian, RajeevLeveraging wire properties at the microarchitecture levelIn future microprocessors, communication will emerge as a major bottleneck. The authors advocate composing future interconnects of some wires that minimize latency, some that maximize bandwidth, and some that minimize power. A microarchitecture aware of these wire characteristics can steer on-chip ...Microarchitecture; Interconnects; Cache coherence2006-11
21 Regehr, JohnPredictable scheduling for digital audioThis paper presents results from applying the Rialto/ NT scheduler to some real Windows 2000 application scenarios. We report on two aspects of this work. First, we studied the reliability of an audio player application and the middleware and kernel components running beneath it in order to assess i...2000-01-01
22 Hansen, Charles D.Recent developments in parallel renderingUsing parallel computers for computer graphics rendering dates back to the late 1970s. Several papers published then focused on image space decompositions for theoretical parallel machines. Early research concentrated on algorithmic studies and special-purpose hardware, but the growing availability...Parallel rendering; Massively parallel processors1994
23 Hansen, Charles D.Interactive texture-based volume rendering for large data setsVisualization is an integral part of scientific computation and simulation. State-of-the-art simulations of physical systems can generate terabytes to petabytes of time-varying data where a single time step can contain more than a gigabyte of data per variable. As memory sizes continue to increase, ...Parallel rendering; Volume rendering; TRex2001
24 Boll, Steven F.Improving linear prediction analysis of noisy speech by predictive noise cancellationThe analysis of speech using Linear Prediction is reformulated to account for the presence of acoustically added noise and a technique is presented for reducing its effect on parameter estimation. The method, called Predictive Noise Cancellation (PNC), modifies the noisy speech autocorrelations ...Linear prediction; Predictive Noise Cancellation; Noisy speech; Sppech analysis1977
25 Regehr, JohnTwo case studies in predictable application scheduling using Rialto/NTThis paper analyzes the results of two case studies in applying the Rialto/NT scheduler to real Windows 2000 applications. The first study is of a soft modem-a modem whose signal processing work is performed on the host CPU, rather than on a dedicated signal processing chip. The second is of an audi...2001-01-01
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