ppxscal/embedding_network huggingface dataset:
Comparison of Tools for Data Mining and Retrieval in High Volume Data Stream
Authors: Mohammed A. Qadeer, Nadeem Akhtar, Faraz Khan
Venue: Proceedings of the 2009 Second International Workshop on Knowledge Discovery and Data Mining (2009)

Applications querying real time data streams in order to identify trends, patterns, or anomalies can often benefit from comparing the live stream data with archived historical stream data. This is especially true for applications involving live & unpredictable data like in traffic analysis & stock markets. However this data mining in DSMSs have turned out to be a costly proposition. In this paper, perform a comparative analysis between various tools available that can handle this historical data & hence facilitate in the Data Mining. For comparing the tools for data retrieval, we cover inclemently, from using traditional DBMS to the more sophisticated tools that utilize Bit-Map indexing or Hoeffding Algorithm. We will see how these tools can simultaneously analyze (1) live streams with high data rates and maintain (2) a large repository of historical stream data.
The multi-item capacitated lot-sizing problem with safety stocks and demand shortage costs
Authors: Nabil Absi, Safia Kedad-Sidhoum
Venue: Computers and Operations Research (2009)

We address a multi-item capacitated lot-sizing problem with setup times, safety stock and demand shortages. Demand cannot be backlogged, but can be totally or partially lost. Safety stock is an objective to reach rather than an industrial constraint to respect. The problem is np-hard. We propose a Lagrangian relaxation of the resource capacity constraints. We develop a dynamic programming algorithm to solve the induced sub-problems. An upper bound is also proposed using a Lagrangian heuristic with several smoothing algorithms. Some experimental results showing the effectiveness of the approach are reported.
Accurate available bandwidth estimation in IEEE 802.11-based ad hoc networks
Authors: Haitao Zhao, Emiliano Garcia-Palacios, Jibo Wei, Yong Xi
Venue: Computer Communications (2009)

Quality of Service (QoS) support in IEEE 802.11-based ad hoc networks relies on the networks' ability to estimate the available bandwidth on a given link. However, no mechanism has been standardized to accurately evaluate this resource. This remains one of the main issues open to research in this field. This paper proposes an available bandwidth estimation approach which achieves more accurate estimation when compared to existing research. The proposed approach differentiates the channel busy caused by transmitting or receiving from that caused by carrier sensing, and thus improves the accuracy of estimating the overlap probability of two adjacent nodes' idle time. Simulation results testify the improvement of this approach when compared with well known bandwidth estimation methods in the literature.
Improved Difference Scheme for a Singularly Perturbed Parabolic Reaction-Diffusion Equation with Discontinuous Initial Condition
Authors: Grigory Shishkin
Venue: Numerical Analysis and Its Applications: 4th International Conference, NAA 2008, Lozenetz, Bulgaria, June 16-20, 2008. Revised Selected Papers (2009)

A Dirichlet problem is considered for a singularly perturbed parabolic reaction-diffusion equation with a piecewise-continuous initial condition. For this problem, using the method of additive splitting of singularities (generated by discontinuities of the initial function and its lowest derivatives) and the Richardson method, a finite difference scheme on piecewise-uniform meshes is constructed that converges &epsilon;-uniformly with the third and second order of accuracy in x and t, respectively.
A new way of information storage using red, green, blue and black color imprints
Authors: Vamsi Talla, Rahul Sangwan, Arun Chattopadhyay
Venue: Microsystem Technologies (2009)

Herein we report the development of a new way of information storage using a scheme based on four colors, namely red, green, blue and black. This provided the advantage of not only storing information in four-color bits, but also in terms of transition from one color to another also representing information storage. The practical demonstration of the method was achieved using a photolithographic principle with colored films as the medium of storage. A CCD camera fitted to an optical microscope was used to retrieve the stored information. The present method provides not only an alternative but also the possibility of higher information storage capacity in comparison to compact disc, digital versatile disc and blu-ray disc technology.
Worst Case Behavior of List Algorithms for Dynamic Scheduling of Non-unit Execution Time Tasks with Arbitrary Precedence Constrains
Authors: Andrei Tchernykh, Klaus Ecker
Venue: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (2008)

Performance properties of list scheduling algorithms under various dynamic assumptions are analyzed. The focus is on bounds for scheduling directed acyclic graphs with arbitrary precedence constrains and arbitrary task processing times subject to minimizing the makespan. New performance bounds are derived and compared with known results.
DRM Oriented Authenticated Group Key Agreement Scheme from Multilinear Form
Authors: Xiaofeng Wang, Nanning Zheng, Lihua Tian
Venue: Proceedings of the 2009 WRI International Conference on Communications and Mobile Computing - Volume 02 (2009)

We propose a DRM oriented authenticated group key agreement scheme from multilinear forms. The new scheme is ID-based, but need not trusted PKG and random oracle model, which effectively solves the key escrow problem. Our scheme can be used to replace the keys distribution scheme of existing DRM system, which avoids the trouble to build trusted channels between each pairs of users. The ID-based cryptography mechanism and multilinear forms are applied here not only provides end-to-end authenticity and confidentiality, but also saves network bandwidth and computational overhead of DRM system.
Electricity Demand Forecasting Based on Feedforward Neural Network Training by a Novel Hybrid Evolutionary Algorithm
Authors: Wenyu Zhang, Yuanyuan Wang, Jianzhou Wang, Jinzhao Liang
Venue: Proceedings of the 2009 International Conference on Computer Engineering and Technology - Volume 01 (2009)

Electricity demand forecasting is an important index to make power development plan and dispatch the loading of generating units in order to meet system demand. In order to improve the accuracy of the forecasting, we apply the feedforward neural network for electricity demand forecasting. Inspired by the idea of Artificial Fish Swarm Algorithm, in this paper we proposed one hybrid evolutionary algorithm which based on PSO and AFSA methods through crossing over the PSO and AFSA algorithms to train the feedforward neural network. This proposed method has been applied in a real electricity load forecasting, the results show that the proposed approach has a better generalization performance and is also more accurate and effective than the feedforward neural network trained by particle swarm optimization.
On the number of components of (k,g)-cages after vertex deletion
Authors: Yuqing Lin, Camino Balbuena, Mirka Miller
Venue: Discrete Applied Mathematics (2009)

A (k,g)-cage is a k-regular graph of girth g and with the least possible number of vertices. In this paper, we investigate the problem of how many connected components there will be after removing a cutset of up to k vertices from a (k,g)-cage.
Modifying voice activity detection in low SNR by correction factors
Authors: H. Farsi, M. A. Mozaffarian, H. Rahmani
Venue: Proceedings of the 3rd WSEAS international conference on Circuits, systems, signal and telecommunications (2009)

In this paper, by using a new estimation algorithm, we present a novel method to improve the performance of VAD systems in various noisy environments. We study the performance of Gamma, Laplacian and Gaussian distributions in low SNR and then modify the best one with correction factors.
Multiple worlds in simulation games for spatial decision making: concept and architecture
Authors: Michele Fumarola, Alexander Verbraeck
Venue: Proceedings of the 40th Conference on Winter Simulation (2008)

In this paper we present the use of "what-if"-analysis in simulation games for spatial decision making by introducing the concept of multiple worlds. We expect that "what-if"-analysis in games enables the trainees to achieve more robust results, which is defined as the ability to achieve the required goals given different scenarios. Scenarios are defined as exogenous variables on the multiple worlds. Viable decisions for a particular world are assessed by splitting the given world into multiple ones and running simulations for these new worlds. This assessment is performed by a) comparing the alternatives represented by each world and b) exploring the timeline of each world by selecting specific time instants. The navigation both through multiple worlds and through time should provide the users the possibility to formulate a robust answer for the specified problem. We will present a viable architecture and 4 distinct modes of game-play for the simulation game.
ESPRIT Project MIMICS: MCMCS Field Trial
Authors: Barbara Lazzerini
Venue: Proceedings of the 1999 IEEE International Conference on Multimedia Computing and Systems - Volume 02 (1999)

SIAS s.r.1. has had an active participation within the MIMICS Project (Esprit Project 20574) not only by developing base sofnvare for H.320 A/V/data multi point conference which was the objective of the project, but also as Minor Partner responsible for the Field Trial MCMCS (Multi Conference Medical Consulting System). The reason why MCMCS has been really appreciated both by the users and by EEC is the really innovative technologic subject we have treated.MCMCS application allows users to take part into H.323 conferences using T.120 protocol too. MCMCS users can have AudioNideo/Data conferences by using TCP/IP protocol. This feature allows to distribute the service to a big number of users and, thanks to the quickly improving technology, to grant good quality/cost performances and more and more increasing diffusion will be possible. This document describes the result of the MCMCS field trial evaluation in the period starting from November the I. 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
Improving Memory Subsystem Performance Using ViVA: Virtual Vector Architecture
Authors: Joseph Gebis, Leonid Oliker, John Shalf, Samuel Williams, Katherine Yelick
Venue: Proceedings of the 22nd International Conference on Architecture of Computing Systems (2009)

The disparity between microprocessor clock frequencies and memory latency is a primary reason why many demanding applications run well below peak achievable performance. Software controlled scratchpad memories, such as the Cell local store, attempt to ameliorate this discrepancy by enabling precise control over memory movement; however, scratchpad technology confronts the programmer and compiler with an unfamiliar and difficult programming model. In this work, we present the Virtual Vector Architecture (ViVA), which combines the memory semantics of vector computers with a software-controlled scratchpad memory in order to provide a more effective and practical approach to latency hiding. ViVA requires minimal changes to the core design and could thus be easily integrated with conventional processor cores. To validate our approach, we implemented ViVA on the Mambo cycle-accurate full system simulator, which was carefully calibrated to match the performance on our underlying PowerPC Apple G5 architecture. Results show that ViVA is able to deliver significant performance benefits over scalar techniques for a variety of memory access patterns as well as two important memory-bound compact kernels, corner turn and sparse matrix-vector multiplication -- achieving 2x---13x improvement compared the scalar version. Overall, our preliminary ViVA exploration points to a promising approach for improving application performance on leading microprocessors with minimal design and complexity costs, in a power efficient manner.
e-government informatics
Authors: Majed Ayyad
Venue: Proceedings of the 2nd International Conference on Theory and Practice of Electronic Governance (2008)

This paper tries to support the proposition that says "All nations face the same problems while planning, designing and implementing e-Government" and tries to exploit this discussion to investigate possible opportunities to build a framework to organize the body of knowledge needed to create the discipline of e-Government informatics. This paper shows how e-Government employs wide range of theories, techniques, methodologies, models, and frameworks to understand and construct solutions and implement them in a specific context. Then argues that e-Government as a "multidisciplinary overarching system" employs knowledge from applied science, pure science and engineering to adapt to the context it operates in. The paper envisages the possibility of generalizing e-Government knowledge areas based on the large magnitude of reusable knowledge, which are identified through a pattern recognition process and through knowledge mapping techniques. Patterns and knowledge maps are used to show that e-Government is not fuzzy and that its design and implementation follow a logical process, which could be abstracted and generalized across many nations. This paper gives a preliminary framework to construct the e-Government informatics discipline with an aim to qualify people to lead the initiatives of e-Government.
Vector fractional programming with quasiinvexity on Riemannian manifolds
Authors: Stefan Mititelu, Constantin Udriste
Venue: Proceedings of the 12th WSEAS international conference on Computers (2008)

This paper establishes necessary conditions of Karush-Kuhn-Tucker type for the efficiency of an admissible solution in a vector fractional Pareto programming problem on a Riemannian manifold. In this context we develop a duality of Mond-Weir type in which the dual program has the same objective as vector fractional function. Our duality is based on direct and converse theorems for weak duality in the context of (ρ, b)-quasiinvexity with respect to the same application η. The paper is divided in four sections. Section 1 introduces some special invexities. Section 2 formulates the aims of the paper regarding a suitable vectorial programming. In Section 3 are established necessary conditions of Karush-Tucker type for the efficiency of a point in a vector fractional Pareto programming problem. Section 4 develops a duality of Mend-Weir type for the same problem, based on direct and converse weak duality theorems. This duality uses the notion of quasi (η, ρ, b)-invexity for the program functions.
Virtual identities in authentication and authorization scenarios
Authors: Santiago Zapata Hernandez, Antonio F. Gomez Skarmeta
Venue: Proceedings of the 2006 International Conference on Privacy, Security and Trust: Bridge the Gap Between PST Technologies and Business Services (2006)

Users accessing to the Internet from everywhere will require to have access to the services in which they have a signed contract. This is the most important feature for roaming users: a way to access to all their services without having in mind where are they connected. For this request, it is required a solution for managing the use of the contract while preserving the privacy of the user and providing security among the entities in the system. The idea for managing it is working towards a federated system which is improved with some features introducing this security and privacy.
OpenMP to GPGPU: a compiler framework for automatic translation and optimization
Authors: Seyong Lee, Seung-Jai Min, Rudolf Eigenmann
Venue: Proceedings of the 14th ACM SIGPLAN symposium on Principles and practice of parallel programming (2009)

GPGPUs have recently emerged as powerful vehicles for general-purpose high-performance computing. Although a new Compute Unified Device Architecture (CUDA) programming model from NVIDIA offers improved programmability for general computing, programming GPGPUs is still complex and error-prone. This paper presents a compiler framework for automatic source-to-source translation of standard OpenMP applications into CUDA-based GPGPU applications. The goal of this translation is to further improve programmability and make existing OpenMP applications amenable to execution on GPGPUs. In this paper, we have identified several key transformation techniques, which enable efficient GPU global memory access, to achieve high performance. Experimental results from two important kernels (JACOBI and SPMUL) and two NAS OpenMP Parallel Benchmarks (EP and CG) show that the described translator and compile-time optimizations work well on both regular and irregular applications, leading to performance improvements of up to 50X over the unoptimized translation (up to 328X over serial).
Schedulability Analysis of Periodic and Sporadic Tasks Using a Timed Discrete Event Model with Memorable Events
Authors: Jung-Min Yang, Seong-Jin Park
Venue: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (2008)

In a real-time system, when the execution of a task is preempted by another task, the interrupted task falls into a blocked state. Since its re-execution begins from the interrupted point generally, the task's timer containing the remaining time until its completion should be maintained in the blocked state. This is the reason for introducing the notion of memorable events in this paper. We present a new timed discrete event model (TDEM) that adds the memorable events to the TDEM framework of Brandin and Wonham (1994). Using supervisory control theory upon the proposed TDEM, we analyze the schedulability of preemptable periodic and sporadic tasks executing on a uniprocessor.
Evolutionary Concepts in End User Productivity and Performance: Applications for Organizational Progress (Advances in End User Computing), 1 edition
Authors: Steve Clarke
Venue:  (2008)

As a progressive field of study, end-user computing is continually becoming a significant focus area for businesses, since refining end-user practices to enhance their productivity contributes greatly to positioning organizations for strategic and competitive advantage in the global economy.Evolutionary Concepts in End User Productivity and Performance: Applications for Organizational Progress represents the most current investigations into a wide range of end-user computing issues. This book enhances the field with new insights useful for researchers, educators, and professionals in the end-user domain.
Transport properties and observation of quantum Hall effects of InAs0.1Sb0.9 thin layers sandwiched between Al0.1In0.9Sb layers
Authors: Ichiro Shibasaki, Hirotaka Geka, Shuichi Ishida, Kenichi Oto, Tomoyuki Ishihara, Takahide Yoshida
Venue: Microelectronics Journal (2009)

InAs0.1Sb0.9 active layers sandwiched between Al0.1In0.9Sb insulating buffer layers were grown on GaAs (100) substrates by molecular beam epitaxy. The basic transport properties at room temperature and quantum Hall effects at low temperature of the InAs0.1Sb0.9 were studied as a function of InAs0.1Sb0.9 thickness. The electron mobility of the InAs0.1Sb0.9 active layers had a very high value and very small thickness dependence at less than 500nm. The quantum Hall effects of the InAs0.1Sb0.9 were observed at thicknesses 15, 20, 30, 50, 70, and 100nm. The observation of the quantum Hall effect at thickness more than 50nm strongly suggests the existence of two-dimensional electron gas in the InAs0.1Sb0.9 layer sandwiched between Al0.1In0.9Sb layers.
Mobile communication solutions for remote data acquisition, supervisory and control systems
Authors: Mariana Jurian, Ioan Lita, Daniel Alexandru Visan
Venue: Proceedings of the 8th conference on Applied informatics and communications (2008)

Mobile communications and radiofrequency technologies represent reliable and efficient solutions for remote data acquisition, supervisory and control systems. The correct selection of the proper transmission method from the wide variety of radio transmission methods and standards represents an important issue. For this reason in the first part of this paper are presented briefly, the newest and most efficient wireless technologies suitable for remote data acquisition, supervisory and control systems. After that, the paper is focus on the GPRS method as solution for implementing such distributed systems. Are presented in detail the GM862 GSM/GPRS modules and the development boards used for tests. In the last part of the paper are listed few basic AT command that shows the operation of presented modules.
Structural and optical properties on thulium-doped LHPG-grown Ta2O5 fibres
Authors: M. Macatrão, M. Peres, C. P. L. Rubinger, M. J. Soares, L. C. Costa, F. M. Costa, T. Monteiro, N. Franco, E. Alves, B. Z. Saggioro, M. R. B. Andreeta, A. C. Hernandes
Venue: Microelectronics Journal (2009)

Structural, spectroscopic and dielectric properties of thulium-doped laser-heated pedestal Ta"2O"5 as-grown fibres were studied. Undoped samples grow preferentially with a single crystalline monoclinic structure. The fibre with the lowest thulium content (0.1at%) also shows predominantly a monoclinic phase and no intra-4f^1^2 Tm^3^+ recombination was observed. For sample with the highest thulium amount (1.0at%), the appearance of a dominant triclinic phase as well as intraionic optical activation was observed. The dependence of photoluminescence on excitation energy allows identification of different site locations of Tm^3^+ ions in the lattice. The absence of recombination between the first and the ground-state multiplets as well as the temperature dependence of the observed transitions was justified by an efficient energy transfer between the Tm^3^+ ions. Microwave dielectric properties were investigated using the small perturbation theory. At a frequency of 5GHz, the undoped material exhibits a dielectric permittivity of 21 and for thulium-doped Ta"2O"5 samples it decreases to 18 for the highest doping concentration. Nevertheless, the dielectric losses maintain a very low value.
Erratum: Erratum to: "A note on the preconditioned Gauss-Seidel method for M-matrices" [J. Comput. Appl. Math. 219 (1) (2008) 59-71]
Authors: Qingbing Liu, Guoliang Chen
Venue: Journal of Computational and Applied Mathematics (2009)

In this note, some errors in a recent article by Niki et al. [H. Niki, T. Kohno, M. Morimoto, The preconditioned Gauss-Seidel method faster than the SOR method, J. Comput. Appl. Math. 219 (2008) 59-71] are pointed out and a new proof for the corresponding result is presented.