ppxscal/embedding_network huggingface dataset:
Fundamental service support for wireless sensor networks
Authors: Chong Liu
Venue:  (2006)

Wireless Sensor Networks (WSNs) are infrastructureless wireless networks that combine sensing, embedded computing, and wireless networking technologies together. Despite the diversity of WSN applications, some functionalities are so fundamental that they are required by most WSN applications. We call them the fundamental services as we believe these services are most important and indispensable for a wide variety of WSNs applications. In this thesis work, we investigate solutions to three fundamental services, namely, localization service, joint scheduling service, and adaptive sampling service. Simulation results and experimental results on real testbed demonstrate the effectiveness and efficiency of these solutions. Our solutions to these fundamental services can serve as the basic building blocks in most applications with WSNs.
Network Synchronization of an Orthogonal CDMA Satellite Communication System
Authors: Diakoumis Gerakoulis, Hsuan-Jung Su, Evaggelos Geraniotis
Venue: Wireless Personal Communications: An International Journal (2007)

This paper provides the network synchronization of an orthogonal CDMA geostationary satellite system for fixed service communications. It includes the synchronization procedures, the system architecture and the performance evaluation. The main objective is to provide network wide synchronization of all uplink orthogonal CDMA transmissions. This is achieved in steps; first by providing coarse synchronization using the uplink random access channel and then fine sync using innovative tracking control mechanisms. The uplink access channel receiver utilize a parallel/serial search method for rapid code acquisition, while the code tracking of the uplink orthogonal CDMA traffic channel is based on a delay feedback early-late gate in which the sych control resides in the receiver. The proposed system is designed to minimize the onboard complexity and satisfy the performance requirements. As shown in the performance section, the requirement that all uplink transmissions are synchronized to a reference time within 10% of the chip length can be achieved. In addition, the system analysis determines the design parameters values which optimize performance.
People, product and process: interactive multimedia case study in integrated design and manufacturing strategies
Authors: R. Stanard, D. Johnston, A. M. Agogino
Venue: Proceedings of the Frontiers in Education Conference on 1995. Proceedings., 1995 vol 1. - Volume 01 (1995)

With the changes in industry practice and the business climate, there is an increased need for restructuring our college curricula to address the needs of the competitive market place. The NSF funded Synthesis Coalition are creating new curricula that expose students to creative synthesis and open ended problem solving experiences and teaching process in addition to technical content. Synthesis based instruction is rich in "real life" engineering material, in which theory is related to engineering practice through the use of engineering case studies that are integrated throughout the curriculum with actual engineering products and processes, open ended design problems, and "best practices" from industry. Instruction is structured so that students are able to develop their written, verbal, and graphical communication skills as well as their course knowledge through group design projects, case role playing and class discussion. "People, Products, and Process" is a multimedia courseware package that was developed to assist engineering, science and business students in understanding and contextualizing the fundamental concepts of the various functional roles in product design and process development. In this courseware, students are presented with open ended problems that require them to explore the inherent tradeoffs between the functional perspectives within a corporation. The courseware is based on actual examples from a diverse range of industries and manufacturing models.
Optimizing jobs timeouts on clusters and production grids
Authors: Tristan Glatard, Xavier
Venue: Proceedings of the Seventh IEEE International Symposium on Cluster Computing and the Grid (2007)

This paper presents a method to optimize the timeout value of computing jobs. It relies on a model of the job execution time that considers the job management system latency through a random variable. It also takes into account a proportion of outliers to model either reliable clusters or production grids characterized by faults causing jobs loss. Job management systems are first studied considering classical distributions. Different behaviors are exhibited, depending on the weight of the tail of the distribution and on the amount of outliers. Experimental results are then shown based on the latency distribution and outlier ratios measured on the EGEE grid infrastructure1. Those results show that using the optimal timeout value provided by our method reduces the impact of outliers and leads to a 1.36 speed-up even for reliable systems without outliers.
PenguinoMeter: a new file-I/O benchmark for Linux®
Authors: Ray Bryant, Dave Raddatz, Roger Sunshine
Venue: Proceedings of the 5th annual Linux Showcase & Conference - Volume 5 (2001)

PenguinoMeter is a new open-source benchmark for Linux that measures file-system data transfer rates. PenguinoMeter allows the user to specify the file-system workload to be used in the benchmark in a very flexible manner. The workload specification is patterned after that of the Intel® Iometer benchmark; the current version of PenguinoMeter can read configuration files produced by Iometer. A series of comparisons between Iometer and PenguinoMeter is used to demonstrate that the workloads generated by these two programs appear to be identical. As an example use of PenguinoMeter, we compare the file system performance of Microsoft® Windows® 2000 Professional and Linux 2.4.9.
Powering Down the Computing Infrastructure
Authors: George Lawton
Venue: Computer (2007)

In response to increasing costs and government-mandated energy efficiency initiatives, manufacturers, vendors, and users are looking for ways to reduce power consumption.
On Interference in Uplink SDMA SC-FDE system
Authors: Fayyaz Siddiqui, Florence Danilo-Lemoine, David Falconer
Venue: Proceedings of the Fifth Annual Conference on Communication Networks and Services Research (2007)

In this paper, the issue of channel estimation with multiple In-Cell co-channel Users (ICUs) in the presence of Out of Cell Interferers (OCIs) is addressed. A Single Carrier Frequency Domain Equalization (SC-FDE), uplink Space Division Multiple Access (SDMA) system with Iterative Block Decision Feedback Equalization (IBDFE), based on the soft decisions is considered. To overcome the intra-cell interference, it is shown that if orthogonality between users during their training phase is assured, then good performance is achievable compared to non-orthogonal training. Moreover, we have shown that the way to multiplex the training either in time or frequency, does not affect the performance in time-variant channels as long as the orthogonality is maintained. It is also shown that Intercell interference could be mitigated with a combination of in-cell orthogonal pilots, spatial diversity and iterative receiver processing. Performance improvement by an IBDFE based on the soft decisions is also shown.
Exploiting availability prediction in distributed systems
Authors: James W. Mickens, Brian D. Noble
Venue: Proceedings of the 3rd conference on Networked Systems Design & Implementation - Volume 3 (2006)

Loosely-coupled distributed systems have significant scale and cost advantages over more traditional architectures, but the availability of the nodes in these systems varies widely. Availability modeling is crucial for predicting per-machine resource burdens and understanding emergent, system-wide phenomena. We present new techniques for predicting availability and test them using traces taken from three distributed systems. We then describe three applications of availability prediction. The first, availability-guided replica placement, reduces object copying in a distributed data store while increasing data availability. The second shows how availability prediction can improve routing in delay-tolerant networks. The third combines availability prediction with virus modeling to improve forecasts of global infection dynamics.
Road scene analysis from perspective image
Authors: Juping Yang
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 06 (1996)

Road scene analysis from a perspective image plays a very important role in road navigation and road following. It seems, however, a formidable task if the road segments show as curves. In this paper we propose a method to perform an analysis of road segments containing both straight lines and curvatures. The method used is to investigate the features of the corresponding points between the road boundaries with the road modeled as planer surface patches. A constraint existing among Euler angles of viewpoint and the vanishing point related to corresponding points on the road plane is shown. To search for the corresponding points from the perspective image we define a function which by means of the Lagrange multiplier leads to a minimum at the corresponding points. Simulations are conducted on both a straight road segment and a curvature road boundary.
Visualization Model of Virtual Plant Growth and its Application
Authors: Qingrong Zhang, Wenyong Wang, Shaochun Zhong, Ying Liang, Qian Xu, Xiaolin Quan
Venue: Proceedings of the 16th International Conference on Artificial Reality and Telexistence--Workshops (2006)

The virtual plant is a research area which develops rapidly along with the development of computer simulation technology, it has become the research hot spot in computer graphics, agriculture information technology and virtual teaching. In the paper, we apply the fractal theory in simulating plants growth process on computer. The constructed plant model can reflect the realistic plants' shape structure and its physiological phenomenon. The timer is used to realize the dynamic control of virtual plants' growth. The visualization model of virtual plants' dynamic growth is applied to the biological teaching, and we obtain a satisfactory result.
Postprocessing for Stochastic Parabolic Partial Differential Equations
Authors: Gabriel J. Lord, Tony Shardlow
Venue: SIAM Journal on Numerical Analysis (2007)

We investigate the strong approximation of stochastic parabolic partial differential equations with additive noise. We introduce postprocessing in the context of a standard Galerkin approximation, although other spatial discretizations are possible. In time, we follow [G. J. Lord and J. Rougemont, IMA J. Numer. Anal., 24 (2004), pp. 587-604] and use an exponential integrator. We prove strong error estimates and discuss the best number of postprocessing terms to take. Numerically, we evaluate the efficiency of the methods and observe rates of convergence. Some experiments with the implicit Euler-Maruyama method are described.
Output-Determinacy and Asynchronous Circuit Synthesis
Authors: Victor Khomenko, Mark Schaefer, Walter Vogler
Venue: Proceedings of the Seventh International Conference on Application of Concurrency to System Design (2007)

Signal Transition Graphs (STG) are a formalism for the description of asynchronous circuit behaviour. In this paper we propose (and justify) a formal semantics of nondeterministic STGs with dummies and OR-causality. For this, we introduce the concept of output-determinacy, which is a relaxation of determinism, and argue that it is reasonable and useful in the speed-independent context. With our theory we improve an STG decomposition algorithm, which can alleviate state explosion.
Design and test of a high performance network-on-chip architecture for highly integrated systems
Authors: Wen-Ben Jone, Qing-An Zeng
Venue:  (2006)

A layered architecture called Network-on-Chip (NoC) has been recently proposed for global communication in a complex System-on-Chip (SoC) design to meet the performance requirements, and many new design and testing issues come up correspondingly. In this work, we aim to develop an efficient test strategy for NoC embedded core testing with a high performance router architecture which can support normal mode as well as testing mode operations. For normal mode router design, we propose to use a novel dynamic XY (namely DyXY) routing method, which provides adaptive routing based on congestion conditions in the proximity, and ensures deadlock-free and livelock-free features at the same time. Analytical models based on queuing theory are developed for DyXY routing in two-dimensional mesh architectures, and analytical results match very much with the simulation results. It is observed that DyXY routing can achieve much better performance when compared with static XY routing and odd-even routing. Hardware is also designed to support the proposed DyXY routing method efficiently. For the embedded core testing, we propose a multiple-data-flit-format (MDFF) test data transportation concept, a heuristic wrapper scan chain configuration method, and a test scheduling algorithm which considers both channel capacity and data flit interleaving in the channels and routers. By applying the proposed test scheduling method together with the MDFF concept and the heuristic scan chain configuration method, the on-chip network channel of a NoC can be fully utilized for embedded core testing, the test time for the entire NoC can be minimized, and the test power dissipation can be controlled well. By comparing the results with other published works, it has been demonstrated that the proposed test scheduling method can achieve significant improvement on the test time for the entire NoC. To support the proposed embedded core testing strategy, the design issues for testing mode operations have also been explored, and a complete router architecture is presented to support both normal mode (DyXY) and testing mode operations. With all these works completed, we have an efficient NoC embedded core testing strategy with the support of a router architecture which provides high performances in test mode as well as normal mode operations.
Reflections on teaching discrete math for the first time
Authors: Kevin L. Huggins, Rachelle DeCoste
Venue: ACM SIGCSE Bulletin (2007)

Teaching a class for the first time is always a challenge. Add to the new experience a team-teaching approach and a professor teaching outside of his comfort zone, and things get even more complicated. In this article we evaluate our team-teaching of Discrete Math to computer science majors at the United States Military Academy. We share the aspects of the course that we think were successful as well as those that we would alter the next time around. This article should help any instructor as he/she prepares to teach a new course, particularly one in discrete mathematics.
A Recovery Protocol for Middleware Replicated Databases Providing GSI
Authors: J. E. Armendariz, F. D. Munoz-Esco, J. R. Juarez, J. R. G. de Mendivil, B. Kemme
Venue: Proceedings of the The Second International Conference on Availability, Reliability and Security (2007)

Middleware database replication is a way to increase availability and afford site failures for dynamic content websites. There are several replication protocols that ensure data consistency for these systems. The most attractive ones are those providing Generalized Snapshot Isolation (GSI), as read operations never block. These replication protocols are based on the certification process, however, up to our knowledge, they do not cope with the recovery of a replica. In this paper we propose a recovery protocol that ensures GSI (we provide an outline of its correctness) that does not interfere with user transactions and permits the execution of transactions in the recovering node, even though the recovery process has not finished.
Ensuring reliability and repeatability in LIGA mold insert fabrication
Authors: J. Schulz, K. Bade, M. Guttmann, L. Hahn, A. Janssen, U. Kohler, P. Meyer, F. Winkler
Venue: Proceedings of the Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS (2003)

As of today, four products with LIGA parts are commercially available: microParts' spectrometer, mechanical drives by micromotion and Faulhaber and an optical fiber connector by Spinner. This indicates that LIGA technology is advancing from a pace-making technology to a key technology for microsystems fabrication. This success was made possible in part by a consistent focus on making the technology reliable. In general, the key technical issues for yield enhancement can be categorized as follows: finding and qualifying external suppliers; modifying processes to reduce handling; finding ways to monitor each machine involved; establishing quality specifications between the process steps; and last but not least improving the understanding of each process step. We give examples for all of these issues.
Understanding and evaluating creativity
Authors: Linda Candy, Zafer Bilda
Venue: Proceedings of the 6th ACM SIGCHI conference on Creativity cognition (2007)

The aim of this tutorial is to provide the participants with an understanding of the significance of creativity for interaction design and to give guidance about the design and evaluation of systems with respect to their role in creativity support. Participants will also be provided with tools for analyzing and evaluating situations in which creative engagement and interaction may be taking place.
Performance evaluation of a real time video surveillance system
Authors: S. Muller-Schneiders, T. Jager, H. S. Loos, W. Niem
Venue: Proceedings of the 14th International Conference on Computer Communications and Networks (2005)

This paper presents a thorough introduction to the real time video surveillance system which has been developed at Bosch Corporate Research considering robustness as the major design goal. A robust surveillance system should especially aim for a low number of false positives since surveillance guards might get distracted by too many alarms caused by, e.g., moving trees, rain, small camera motion, or varying illumination conditions. Since a missed security related event could cause a serious threat for an installation site, the before mentioned criterion is obviously not sufficient for designing a robust system and thus a low number of false negatives should simultaneously be achieved. Due to the fact that the false negative rate should ideally be equal to zero, the surveillance system should be able to cope with varying illumination conditions, low contrast and occlusion situations. Besides presenting the building blocks of our video surveillance system, the measures taken to achieve robustness is illustrated in this paper. Since our system is based on algorithms for video motion detection, which has been described e.g. in M. Mayer et al., (1996), the previous set of algorithms had to be extended to feature a complete video content analysis system. This transition from simple motion detection to video content analysis is also discussed in the following. In order to measure the performance of our system, quality measures calculated for various PETS sequences is presented.
Single instance storage in Windows® 2000
Authors: William J. Bolosky, Scott Corbin, David Goebel, John R. Douceur
Venue: Proceedings of the 4th conference on USENIX Windows Systems Symposium - Volume 4 (2000)

Certain applications, such as Windows 2000's Remote Install service, can result in a set of files in which many different files have the same content. Using a traditional file system to store these files separately results in excessive use of disk and main memory file cache space. Using hard or symbolic links would eliminate the excess resource requirements, but changes the semantics of having separate files, in that updates to one "copy" of a file would be visible to users of another "copy." We describe the Single Instance Store (SIS), a component within Windows® 2000 that implements links with the semantics of copies for files stored on a Windows 2000 NTFS volume. SIS uses copy-on-close to implements the copy semantics of its links. SIS is structured as a file system filter driver that implements links and a user level service that detects duplicate files and reports them to the filter for conversion into links. Because SIS links are semantically identical to separate files, SIS creates them automatically when it detects files with duplicate contents. This paper describes the design and implementation of SIS in detail, briefly presents measurements of a remote install server showing a 58% disk space savings by using SIS, and discusses other possible uses of SIS.
Syntax error analysis as a problem solving technique
Authors: A. T. Rose
Venue: Proceedings of the 30th Annual Frontiers in Education - Volume 02 (2000)

Traditional problem solving in technical courses involves a problem statement followed by extracting a given and required from the verbiage. A detailed solution then follows. This is not the only form of problem students will encounter in industry. Often the industrial problem has a solution but an error is present in the result. Debugging the solution then becomes a new problem requiring a different set of skills and techniques. To expose students to this type of problem, a syntax error analysis concept is proposed. The concept involves giving the students a problem statement along with an erroneous solution. Students are required to analyze the problem and determine where errors occur in the analysis. A preliminary trial using this type of problem has been conducted and student feedback obtained. The results will be used to further develop and improve this type of learning experience. 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
Multi-dimensional pruning from the Baumann point in an Interval Global Optimization Algorithm
Authors: Boglárka Tóth, Leocadio G. Casado
Venue: Journal of Global Optimization (2007)

A new pruning method for interval branch and bound algorithms is presented. In reliable global optimization methods there are several approaches to make the algorithms faster. In minimization problems, interval B B methods use a good upper bound of the function at the global minimum and good lower bounds of the function at the subproblems to discard most of them, but they need efficient pruning methods to discard regions of the subproblems that do not contain global minimizer points. The new pruning method presented here is based on the application of derivative information from the Baumann point. Numerical results were obtained by incorporating this new technique into a basic Interval B B Algorithm in order to evaluate the achieved improvements.
Sequence families sets constructed from quadratic congruence codes for use in secure spread spectrum watermarking for multimedia
Authors: C. S. Lim
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 2001. on IEEE International Conference - Volume 03 (2001)

Digital watermarking for multimedia information has been widely adopted as a measure to detect copyright infringements. In many watermarking schemes, often only one watermarking signature is used in the embedding of hidden information. This paper introduces new multiple sequence families with good auto- and cross-correlation properties, which are ideal in the application of digital watermarking. It is also envisaged that the good cross-correlation property of these multiple families of sequences allows for the use of multiple signatures in a watermarking scheme. Multiple signatures increases the robustness of the watermarking scheme and also retrieving for independent signatures is straightforward due to the low cross-correlation property of the the member sequence.