ppxscal/embedding_network huggingface dataset:
Dynamic Distribution and Execution of Tasks in Pervasive Grids
Authors: Antonio Coronato, Giuseppe De Pietro, Luigi Gallo
Venue: Proceedings of the 15th Euromicro International Conference on Parallel, Distributed and Network-Based Processing (2007)

Grid computing and pervasive computing have rapidly emerged and affirmed respectively as the paradigm for high performance computing and the paradigm for user-friendly computing. The conjunction of such paradigms are now generating a new one, the Pervasive Grid Computing, which aims at extending classic grids with characteristics of pervasive computing like spontaneous and transparent integration of mobile devices, context-awareness, pro-activity, and so on. In this paper, we present a software infrastructure for integrating mobile devices as active resources in a grid. In particular, it has been developed a service able to dynamically distribute and execute user's tasks on a grid of mobile and fixed devices. Mobile devices participate to the grid in a way completely transparent to their owners, hence the computational power is given without any configuration operation and in a reliable way. As well, users willing of executing their applications directly submit their code without caring of choosing and allocating resources of the grid.
Self-Balanced and Self-Adaptive Routes in Unstructured P2P Networks
Authors: Miguel Angel Rojas, Herwig Unger, Hauke Coltzau
Venue: Proceedings of the Second International Conference on Systems (2007)

A simple strategy for routing and load balancing in unstructured P2P network based on ant-like agents is presented [1]. In [Unger, Wulff], the authors present an algorithm, which enables to build a sorted structure on top of a P2P Network in order to support searching in such systems and to reduce maintenance times. Based on this structure, a routing mechanism that allows the user to send messages between two peers in finite time will be provided. The current work adopts Ant Systems as introduced by Dorigo, Maniezzo and Colorini [6] and looks for alternative paths near to the optimal route in case of congestion conditions. Although ANTs take advantage of collaborative behavior and sign the closest paths, it is also possible to rapidly saturate the communication channels between source and target nodes. Therefore, a load balancing criterion is considered, as well.
Supporting creative acts beyond dissemination
Authors: David A. Shamma, Ryan Shaw
Venue: Proceedings of the 6th ACM SIGCHI conference on Creativity cognition (2007)

In this workshop, we describe and expose the mysterious creative process. We discuss models (both classical and contemporary) of creative practice and experience and their potential application to new media arts and technology. Models that connect the roles of creator and viewer/participant are of particular interest. The goal is to catalyze new ideas and foster creative collaboration across disciplines.
Adaptive energy-efficient registration and online scheduling for asymmetric wireless sensor networks
Authors: Saravanan Balasubramanian, Demet Aksoy
Venue: Computer Networks: The International Journal of Computer and Telecommunications Networking (2007)

Increasing onboard processing capabilities of sensors enable self-organization in wireless sensor networks to dynamically adapt to ad hoc topologies and to react to task or network changes. Such self-organization, however. comes at a cost of additional energy consumption for the sensor nodes with already limited power resources. As energy limitations in unattended environments raise a major concern, such organizations need to trade-off between power consumption and topology maintenance. In this paper we present our adaptive energy-efficient registration and online scheduling (AEROS) protocol that exploits application based data flow characteristics to reduce power consumption during self-organization. Asymmetric data flow characteristics is used to govern route selection, and to formulate an organized transmission schedule with risk-free sleeping time. Our simulation results suggest that AEROS's transmission schedule allows the minimum number of data message exchanges and guarantees a collision-free communication. AEROS provides significant energy savings in steady state using a low number of control messages.
The architecture of a distributed virtual worlds system
Authors: Manny Vellon, Kirk Marple, Don Mitchell, Steven Drucker
Venue: Proceedings of the 4th conference on USENIX Conference on Object-Oriented Technologies and Systems - Volume 4 (1998)

We have developed an object model that facilitates the development of shared virtual environments. We have implemented our object model on top of COM and OLE Automation and facilitated access from Active Scripting enabled languages. This paper provides a brief description of the work we have done on the V-Worlds project.
A semi-blind approach for MMSE equalization in downlink CDMA channel
Authors: Jinho Choi
Venue: Proceedings of the The 8th International Conference on Communication Systems - Volume 01 (2002)

We investigate the chip-level equalization using finite impulse response (FIR) equalizers for the mobile station of code division multiple access (CDMA) systems with single and multiple receive antennas. As a semi-blind method, a generalized minimum mean square error (MMSE) equalization, which combines the MMSE and blind approaches together, is investigated. It is shown that the generalized MMSE equalizer can effectively increase the number of samples to track the variation of channel and thereby performs better when the coherence time is small. In addition, we derive a closed-form solution of the MMSE and generalized MMSE equalizers for given channels. The ACM Portal is published by the Association for Computing Machinery. Copyright © 2010 ACM, Inc. Terms of Usage Privacy Policy Code of Ethics Contact Us Useful downloads: Adobe Acrobat QuickTime Windows Media Player Real Player
Low-degree tests at large distances
Authors: Alex Samorodnitsky
Venue: Proceedings of the thirty-ninth annual ACM symposium on Theory of computing (2007)

We define tests of boolean functions which distinguish between linear (or quadratic) polynomials, and functions which are very far, in an appropriate sense, from these polynomials. The tests have optimal or nearly optimal trade-offs between soundness and the number of queries. A central step in our analysis of quadraticity tests is the proof of aninverse theorem for the third Gowers uniformity norm of boolean functions. The last result implies that it ispossible to estimate efficiently the distance from the second-order Reed-Muller code on inputs lying far beyond its list-decoding radius. Our main technical tools are Fourier analysis on Z2n and methods from additive number theory. We observe that these methods can be used to give a tight analysis of the Abelian Homomorphism testing problemfor some families of groups, including powers of Zp.
Teaching undergraduate computer science and engineering students techniques for the design and analysis of real-time applications
Authors: M. W. Mutka
Venue: Proceedings of the 28th Annual Frontiers in Education - Volume 03 (1998)

Michigan State University has begun a project to incorporate embedded systems education across several courses. This paper provides an overview of the project and details specific efforts to enhance one of the courses, operating systems, in order to include special instruction of real-time computing. The instruction material developed is modularized such that its components detailing scheduling issues and laboratory project ideas and infrastructure will be available for other courses, such as the software engineering and the computer engineering project courses.
Converting Project Team Experience to Organizational Learning: A Case Study
Authors: Lynne P. Cooper
Venue: Proceedings of the 40th Annual Hawaii International Conference on System Sciences (2007)

Project teams represent both a mechanism for accomplishing work and an opportunity for learning within organizations. This paper investigates how an organization can learn from its project teams. It presents a case study of a complete experiential learning cycle within a single organization's new product development process. Post-mortem feedback was collected from the broad spectrum of organizational participants and the ten project teams that were operating simultaneously. This feedback was analyzed using an issue-focused approach, and learning was assessed based on actionable knowledge: the changes made to the process for future projects..
A senior-level engineering course that meets general education requirements
Authors: K. A. Kramer
Venue: Proceedings of the Frontiers in Education Conference,1997. on 27th Annual Conference. Teaching and Learning in an Era of Change. - Volume 01 (1997)

The use of a senior-level engineering course to meet general education requirements for an upper-division writing course is discussed. An engineering course was developed following guidelines for an upper-division in-major course that requires (a) frequent writing tasks with feedback on the content and quality of the writing, (b) a process-oriented approach to writing instruction, (c) study of models of writing by professionals in the discipline, and (d) significant engineering content. While the first three requirements could be met by any writing course, the last requirement meant that a required engineering course with both technical content and significant nontechnical content had to be developed. The solution was to coordinate the writing course with the senior project sequence that is immediately following. Technical subject matter used for assignments was chosen for its applicability to the senior project courses that follow using input from the instructor for those courses. In addition, written and oral projects were chosen to introduce formats useful within the design cycle of a project. Results are presented regarding enhancements of an existing course.
Resource-Constrained Workflow Modeling
Authors: Jiacun Wang, William Tepfenhart, Daniela Rosca, Anni Tsai
Venue: Proceedings of the First Joint IEEE/IFIP Symposium on Theoretical Aspects of Software Engineering (2007)

Business processes are often constrained by resource availability. This is particularly true in an emergency response system where large quantity of resources, including emergency responders, ambulances, fire trucks, medications, food, clothing, etc., are required. In our previous work, we introduced WIFA model to meet the needs of incident command systems workflow modeling and analysis. In this paper, we extend WIFA to take resources into account when modeling and enacting workflows. A formal resourceconstrained workflow model is defined and the state transitions rules are established to support workflow analysis. An example is given to illustrate the use of the model.
A new computational method for piezoelectric plate modeling: application to membrane microsensors
Authors: L. Ferrario, S. Taschini, M. Emmenegger, H. Baltes, J. G. Korvink
Venue: Proceedings of the Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS (2003)

Among applications of the piezoelectric effect in micro-electro-mechanical systems (MEMS), several employ membranes as the active region of the device. We have developed a new multilayered piezoelectric composite plate finite element that improves the modeling of piezoelectric membranes. In this paper we present the implementation of the element within the finite element package FEMEngine. We demonstrate the validity of the theory and use the implementation to simulate a viscosity sensor for food-stuff monitoring. Our work is motivated by the fact that the accurate modeling of piezoelectric multilayered membranes is not possible with currently available commercial finite element software.
Consistent and automatic replica regeneration
Authors: Haifeng Yu, Amin Vahdat
Venue: Proceedings of the 1st conference on Symposium on Networked Systems Design and Implementation - Volume 1 (2004)

Reducing management costs and improving the availability of large-scale distributed systems require automatic replica regeneration, i.e., creating new replicas in response to replica failures. A major challenge to regeneration is maintaining consistency when the replica group changes. Doing so is particularly difficult across the wide area where failure detection is complicated by network congestion and node overload. In this context, this paper presents Om, the first read/write peer-to-peer wide-area storage system that achieves high availability and manageability through online automatic regeneration while still preserving consistency guarantees. We achieve these properties through the following techniques. First, by utilizing the limited view divergence property in today's Internet and by adopting the witness model, Om is able to regenerate from any single replica rather than requiring a majority quorum, at the cost of a small (10-6 in our experiments) probability of violating consistency. As a result, Om can deliver high availability with a small number of replicas, while traditional designs would significantly increase the number of replicas. Next, we distinguish failure-free reconfigurations from failure-induced ones, enabling common reconfigurations to proceed with a single round of communication. Finally, we use a lease graph among the replicas and a two-phase write protocol to optimize for reads, and reads in Om can be processed by any single replica. Experiments on PlanetLab show that consistent regeneration in Om completes in approximately 20 seconds.
Protecting Cryptographic Keys from Memory Disclosure Attacks
Authors: Keith Harrison, Shouhuai Xu
Venue: Proceedings of the 37th Annual IEEE/IFIP International Conference on Dependable Systems and Networks (2007)

Cryptography has become an indispensable mechanism for securing systems, communications and applications. While offering strong protection, cryptography makes the assumption that cryptographic keys are kept absolutely secret. In general this assumption is very difficult to guarantee in real life because computers may be compromised relatively easily. In this paper we investigate a class of attacks, which exploit memory disclosure vulnerabilities to expose cryptographic keys. We demonstrate that the threat is real by formulating an attack that exposed the private key of an OpenSSH server within 1 minute, and exposed the private key of an Apache HTTP server within 5 minutes. We propose a set of techniques to address such attacks. Experimental results show that our techniques are efficient (i.e., imposing no performance penalty) and effective -- unless a large portion of allocated memory is disclosed.
System identification via singular value decomposition
Authors: Shih-Ho Wang
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 05 (1996)

The problem of identification of linear time invariant system parameters from its truncated impulse response data is studied. We analyze the algorithm originally proposed by Kung (1978), and later modified by others, which is based on the singular value decomposition of the Hankel matrix. We propose a modified algorithm which generates more accurate results.
An effective AMS top-down methodology applied to the design of a mixed-signal UWB system-on-chip
Authors: Marco Crepaldi, Mario R. Casu, Mariagrazia Graziano, Maurizio Zamboni
Venue: Proceedings of the conference on Design, automation and test in Europe (2007)

The design of Ultra Wideband (UWB) mixed-signal SoC for localization applications in wireless personal area networks is currently investigated by several researchers. The complexity of the design claims for effective top-down methodologies. We propose a layered approach based on VHDL-AMS for the first design stages and on an intelligent use of a circuit-level simulator for the transistor-level phase. We apply the latter just to one block at a time and wrap it within the system-level VHDL-AMS description. This method allows to capture the impact of circuit-level design choices and non-idealities on system performance. To demonstrate the effectiveness of the methodology we show how the refinement of the design affects specific UWB system parameters such as bit-error rate and localization estimations.
Low complexity blind space-time identification of propagation parameters
Authors: M. Chenu-Tournier
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 05 (1999)

The radio electrical transmissions often have multiple paths due to reflections on physical objects or due to the inhomogeneity of the propagation medium for example the ionospheric layers in a HF communication. This work presents a new algorithm for the blind estimation of the physical parameters in a multipath channel (direction of arrival, time delay and fading). The results exposed are useful for tactical applications such as HF radio-localization, or for radio communication systems, to combat the degradations due to the channel. The present study is based on the recent work done on blind deconvolution which estimates the channels impulse responses. Based on a physical path parametric model, a spatio-temporal parametric blind identification of the front wave is performed. These parameters are direction of arrival: DOA /spl theta/, relative time delay /spl tau/ and complex gain /spl phi/ (fading).
Fabrication sub-micron gratings based on embossing
Authors: Yigui Li, Chun Hui, Jun Zhu, Jingquan Liu, Y. Kanamori
Venue: Proceedings of the Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS (2003)

We demonstrated two kinds of sub-micron gratings fabricated by embossing method from anisotropically etched silicon molds. One kind of grating is a line grating with a pitch of 500 nm; the other kind is grating array with a pitch of 200 nm. We investigated the feasibility of the fabrication method for the micro fabrication of the high aspect ratio silicon molds: that is for fabricating molds by using electron beam lithography plus fast atom beam (FAB) etching. The replication yield, repeatability and efficiency from the original master are good. This technique can also be used to fabricate other sub-micron scale structures.
Uncertainty in the environmental modelling process - A framework and guidance
Authors: Jens Christian Refsgaard, Jeroen P. van der Sluijs, Anker Lajer Højberg, Peter A. Vanrolleghem
Venue: Environmental Modelling Software (2007)

A terminology and typology of uncertainty is presented together with a framework for the modelling process, its interaction with the broader water management process and the role of uncertainty at different stages in the modelling processes. Brief reviews have been made of 14 different (partly complementary) methods commonly used in uncertainty assessment and characterisation: data uncertainty engine (DUE), error propagation equations, expert elicitation, extended peer review, inverse modelling (parameter estimation), inverse modelling (predictive uncertainty), Monte Carlo analysis, multiple model simulation, NUSAP, quality assurance, scenario analysis, sensitivity analysis, stakeholder involvement and uncertainty matrix. The applicability of these methods has been mapped according to purpose of application, stage of the modelling process and source and type of uncertainty addressed. It is concluded that uncertainty assessment is not just something to be added after the completion of the modelling work. Instead uncertainty should be seen as a red thread throughout the modelling study starting from the very beginning, where the identification and characterisation of all uncertainty sources should be performed jointly by the modeller, the water manager and the stakeholders.
Capillaroscopy Image Analysis as an Automatic Image Annotation Problem
Authors: Halina Kwasnicka, Mariusz Paradowski, Krzysztof Borysewicz
Venue: Proceedings of the 6th International Conference on Computer Information Systems and Industrial Management Applications (2007)

Image auto-annotation methods perform the description previously unseen images with a set of words, based on previously shown examples. This is a relatively new paradigm in image processing research domain. Capillaroscopy is a branch of medicine focusing on analysis of vascular changes. Among others, it is a very helpful tool in diagnosis of many rheumatic diseases. The paper presents a preliminary research on usage of image auto-annotation methods for the computer-aided diagnosis from capillaroscopy images.
From course notes to granules: A guide to deriving Learning Object components
Authors: Jessica Griffiths, Geneen Stubbs, Mike Watkins
Venue: Computers in Human Behavior (2007)

Learning Objects (LOs) remain a complex entity, particularly for novices, and creating the resources from the beginning can be a daunting prospect if there is no development team for collaboration. Multiple issues need to be considered, including how LOs are defined, how LOs are planned, granularity and reusability, and categorisation of LOs. The paper outlines these issues and offers a solution to assist novice creators of Learning Objects from existing materials. Using the Cisco Reusable Learning Object Strategy to define and plan the Learning Object, this paper proposes a task analysis to derive granules of learning material, matched to appropriate competency levels. Tests of these guidelines produced 586 potential information objects that are small, granular items, each with a prerequisite, an objective and a skill level.
Applied Computational Fluid Dynamics in Support of Aircraft/Store Compatibility and Weapons Integration
Authors: Joseph M. Keen
Venue: Proceedings of the HPCMP Users Group Conference (2006)

The Air Force SEEK EAGLE Office (AFSEO), Eglin Air Force Base (AFB), FL, is the United States Air Force (USAF) authority for weapons certification efforts. AFSEO performs test and evaluation for aircraft/store compatibility certification. Computational Fluid Dynamics (CFD) is employed to support this process. Determining the flow about an aircraft/store combination may be extremely difficult. Complicated geometry features such as pylons, launchers, grid fins, and internal weapons bays create severe aerothermodynamic and acoustic environments which are challenging to simulate numerically. Rapidly and accurately modeling the trajectory of store separation in a high-volume simulation environment presents an additional challenge. The USAF requirement for numerous, simultaneous and quick-reaction solutions for a wide variety of stores and aircraft can only be accomplished through application of parallel high-performance computing resources that meet the significant computational and memory demands associated with the certification computational environment.
UbiSettlers--A Dynamically Adapting Mobile P2P Multiplayer Game for Hybrid Networks
Authors: Christian Hiedels, Christian Hoff, Steffen Rothkugel, Ulf Wehling
Venue: Proceedings of the Fifth IEEE International Conference on Pervasive Computing and Communications Workshops (2007)

UbiSettlers is a prototype of a mobile multiplayer game for hybrid networks running on real hardware. It uses dynamic adaptation and topology control mechanisms to deal with problems inherent to ad hoc and wireless infrastructured networks. In particular, a globally consistent view on the game's state is not mandatory. This is facilitated by resolving inconsistencies through appropriate integration into the semantics of the game itself. In addition to that, we focus also on network feedback to integrate changing network topologies into the game. Moreover, stimulating cooperation is another major facet of the game design and implementation.