ppxscal/embedding_network huggingface dataset:
Techniques for pipelined broadcast on ethernet switched clusters
Authors: Pitch Patarasuk, Xin Yuan, Ahmad Faraj
Venue: Journal of Parallel and Distributed Computing (2008)

By splitting a large broadcast message into segments and broadcasting the segments in a pipelined fashion, pipelined broadcast can achieve high performance in many systems. In this paper, we investigate techniques for efficient pipelined broadcast on clusters connected by multiple Ethernet switches. Specifically, we develop algorithms for computing various contention-free broadcast trees that are suitable for pipelined broadcast on Ethernet switched clusters, extend the parametrized LogP model for predicting appropriate segment sizes for pipelined broadcast, show that the segment sizes computed based on the model yield high performance, and evaluate various pipelined broadcast schemes through experimentation on Ethernet switched clusters with various topologies. The results demonstrate that our techniques are practical and efficient for contemporary fast Ethernet and Giga-bit Ethernet clusters.
Mean Compositing, an alternative strategy for producing temporal syntheses. Concepts and performance assessment for SPOT VEGETATION time series
Authors: C. Vancutsem, J. -F. Pekel, P. Bogaert, P. Defourny
Venue: International Journal of Remote Sensing (2007)

Various compositing criteria have been proposed to produce cloud-free images from optical time series. However, they often favour specific atmospheric and geometric conditions, which may cause serious inconsistencies in the syntheses. Algorithms including BRDF normalization minimize variations induced by the anisotropy of the target. However, their operational implementation faces some issues. This study proposes to avoid these issues by using a new strategy based on a statistical approach, i.e. Mean Compositing, and by comparing it with three existing techniques. A quantitative evaluation methodology with statistical tests on reflectance and texture values as well as visual comparisons were applied to numerous SPOT VEGETATION time series. The performance criterion was to best mimic the information content of a single cloud-free near-nadir view image. Moreover a quantitative approach was used to assess the temporal consistency of the syntheses. The results showed that the proposed strategy combined with an efficient quality control produces images with greater spatial consistency than currently available VEGETATION products but produces slightly more uneven time series than the most advanced compositing algorithm.
DiProNN: Distributed Programmable Network Node Architecture
Authors: Tomá Rebok
Venue: Proceedings of the Fourth International Conference on Networking and Services (2008)

The programmable network approach allows processing of passing user data in a network, which is highly suitable especially for multimedia streams processing. However, programming of complex stream processing applications for programmable nodes is not effortless since they usually do not provide sufficient flexibility (both programming flexibility and execution environment flexibility). In this paper we present the programmable network node architecture named DiProNN that is able to accept and run user-supplied programs and/or virtual machines and process them over passing data. All the DiProNN programs are described using our modular programming model based on the workflow principles that takes advantages of DiProNN virtualization and makes programming of complex streaming applications easier. As a possible application we show a sketch implementation of simple MCU (Multipoint Control Unit) used for large videoconferences that profits from DiProNN properties.
Error-resilient transmission of quality-scalable images over wireless channels
Authors: Abdullah Al Muhit
Venue: Digital Signal Processing (2008)

A new strategy for robust wireless transmission of scalable images is proposed. The proposed scheme utilizes the quality-progressive structure of the scalable code-stream and optimally protects different quality layers based on channel conditions using multi-rate low-density parity-check (LDPC) codes, leading to a flexible joint source-channel coding design. To accommodate optimal channel protection to important source layers, this novel technique is able to truncate the less important ones, when necessary. Furthermore, the number of iterations to find the optimal solution does not depend on the number of scalable source elements. Results show that the proposed scheme facilitates considerable gains in terms of subjective and objective quality as well as decoding probability of the retrieved images.
A Fourier spectral-discontinuous Galerkin method for time-dependent 3-D Schrödinger-Poisson equations with discontinuous potentials
Authors: Tiao Lu, Wei Cai
Venue: Journal of Computational and Applied Mathematics (2008)

In this paper, we propose a high order Fourier spectral-discontinuous Galerkin method for time-dependent Schrodinger-Poisson equations in 3-D spaces. The Fourier spectral Galerkin method is used for the two periodic transverse directions and a high order discontinuous Galerkin method for the longitudinal propagation direction. Such a combination results in a diagonal form for the differential operators along the transverse directions and a flexible method to handle the discontinuous potentials present in quantum heterojunction and supperlattice structures. As the derivative matrices are required for various time integration schemes such as the exponential time differencing and Crank Nicholson methods, explicit derivative matrices of the discontinuous Galerkin method of various orders are derived. Numerical results, using the proposed method with various time integration schemes, are provided to validate the method.
A Model Based Testing Technique to Test Web Applications Using Statecharts
Authors: Hassan Reza, Kirk Ogaard, Amarnath Malge
Venue: Proceedings of the Fifth International Conference on Information Technology: New Generations (2008)

In this paper, we discuss a model based software testing method for testing of the web applications using StateCharts. To this end, we briefly describe the test coverage technique, editorial tools for drawing StateCharts, modeling concurrency in web applications, and test metrics. A simple web application has been used to show the feasibility of our approach.
Biometrics: Modelling the Body
Authors: Mario Savastano
Venue: Proceedings of the Tenth International Conference on Computer Modeling and Simulation (2008)

The paper aims to highlight how biometrics is correlated to the appropriate modelling of some parts of the human body. Starting from a general discussion on the progressive evolution of the "identity" concept, the Author put in evidence the difficulties correlated to the human nature of a model which changes with the time and, at the same time, may be strongly influenced by the some external conditions.
Domain Specific High-Level Constraints for User Interface Layout
Authors: Christof Lutteroth, Robert Strandh, Gerald Weber
Venue: Constraints (2008)

We present the Auckland Layout Model (ALM), a constraint-based technique for specifying 2D layout as it is used for arranging the controls in a graphical user interface (GUI). Most GUI frameworks offer layout managers that are basically adjustable tables; often adjacent table cells can be merged. In the ALM, the focus switches from the table cells to vertical and horizontal tabulators between the cells. On the lowest level of abstraction, the model applies linear constraints, and an optimal layout is calculated using linear programming. However, bare linear programming makes layout specification cumbersome and unintuitive, especially for GUI domain experts who are often not used to such mathematical formalisms. In order to improve the usability of the model, ALM offers several other layers of abstraction that make it possible to define common GUI layout more easily. In the domain of user interfaces it is important that specifications are not over-constrained, therefore ALM introduces soft constraints, which are automatically translated to appropriate hard linear constraints and terms in the objective function. GUIs are usually composed of rectangular areas containing controls, therefore ALM offers an abstraction for such areas. Dynamic resizing behavior is very important for GUIs, hence areas have domain-specific parameters specifying their minimum, maximum and preferred sizes. From such definitions, hard and soft constraints are automatically derived. A third level of abstraction allows designers to arrange GUIs in a tabular fashion, using abstractions for columns and rows, which offer additional parameters for ordering and alignment. Row and column definitions are used to automatically generate definitions from lower levels of abstraction, such as hard and soft constraints and areas. Specifications from all levels of abstraction can be consistently combined, offering GUI developers a rich set of tools that is much closer to their needs than pure linear constraints. Incremental computation of solutions makes constraint solving fast enough for near real-time use.
An ordering method for intuitionistic fuzzy numbers
Authors: Hassan Mishmast Nehi
Venue: Proceedings of the 9th WSEAS International Conference on Systems (2005)

In this paper first we review two ranking methods for intuitionistic fuzzy numbers (IF numbers), then we proposed a new ordering method for IF numbers in which we consider two characteristic values of membership and non-membership for an IF number.
Towards IDE support for abstract thinking
Authors: Oren Mishali, Yael Dubinsky, Itay Maman
Venue: Proceedings of the 2nd international workshop on The role of abstraction in software engineering (2008)

Abstract thinking is considered to be a high level cognitive skill that enables a comprehensive understanding of a specific concept or a problem using different levels of detailing. Based on a lab activity we conducted on the matter of abstraction, we present guidelines for enabling an Integrated Development Environment (IDE) to promote abstract thinking. The guidelines are defined in the context of an Aspect-Oriented Process Support (AOPS) framework that aims at customizing IDEs to automatically support various software development practices. Specifically, we suggest two kinds of guidelines. The first is concerned with a positive feedback from the IDE in cases where abstraction is used. The second kind is concerned with cases in which the developer is encouraged to move to a different level of detailing, that is, promoted to use abstract thinking.
Layered Software Challenge of Wireless Technology in the Oil & Gas Industry
Authors: Stig Petersen, Simon Carlsen, Amund Skavhaug
Venue: Proceedings of the 19th Australian Conference on Software Engineering (2008)

Recent advances in wireless technology have enabled the development of low-cost wireless solutions capable of robust and reliable communication within application areas such as wireless networking, wireless sensor networks, and asset tracking. For the Oil & Gas industry, utilizing this technology will lead to reduced operating costs and enable new applications.There are several challenges related to the introduction of wireless technology in the Oil & Gas industry. Primarily, wireless devices have to execute software implementations of complex network algorithms with real-time requirements on embedded platforms with limited resources and low-power requirements. Further, how to enable the monitoring and control applications of the wireless solutions to be managed and operated by technical personnel who do not necessarily have extensive knowledge of the underlying wireless technology. And finally, wireless systems should seamlessly integrate with already existing IT infrastructure and user applications.In this paper, issues related to these challenges are investigated.
A study of electron transition in the energy gap of SI-GaAs with photoconductivity spectra and under α-particle irradiation
Authors: G. E. Zardas, P. H. Yannakopoulos, Chrys I. Symeonides, M. Vesely, P. C. Euthymiou
Venue: Microelectronics Journal (2008)

The aim of the present work is to study the density of electron transitions inside the energy gap of SI-GaAs at various temperatures and under @a-particle irradiation at 300K. The photocurrent as a function of photon energy from 1.35 to 1.80eV, for each temperature, was measured in the temperature range from 180 to 300K. From the spectra analysis for each temperature, three peaks were found. The energy that corresponds to the peaks as a function of temperature was plotted. The temperature and the irradiation strongly affect the value of the peaks, which is related to the number of transitions of the electrons inside the energy gap. As the temperature decreases, the peaks follow the same change. After irradiation, the values of the peaks decrease for all temperatures and this decrease is more intense for the P3 peak.
An Approach to Mitigate Wormhole Attack in Wireless Ad Hoc Networks
Authors: Gunhee Lee, Jungtaek Seo, Dong-kyoo Kim
Venue: Proceedings of the 2008 International Conference on Information Security and Assurance (isa 2008) (2008)

Wormhole attack is one of the most severe threats to ad hoc networks. There have been many researches to overcome the wormhole attack. These researches, however, still have some limitations to handle wormhole attacks properly such as burden of computation, complicated steps before making up a session, and no response method. In this paper, we propose an effective wormhole attack defense method that can properly detect wormhole attacks and respond to them. Each node maintains its neighbors' information. According to the information, each node can identify replayed packet that forwarded by two attackers. We analyze the effectiveness of the proposed method and the efficiency of the approach by using traffic and memory space measure.
Integrating ddi metadata into the nara transcontinental persistent archive prototype via the oai-pmh
Authors: Jewel H. Ward, Jonathan Crabtree
Venue: Proceedings of the 8th ACM/IEEE-CS joint conference on Digital libraries (2008)

The H.W. Odum Institute for Research in Social Science (Odum), the Renaissance Computing Institute (RENCI), and the School of Information and Library Science (SILS), all part of the University of North Carolina at Chapel Hill (UNC-CH), are collaborating with the San Diego Supercomputer Center (SDSC) on an extension of the National Archives and Records Administration's (NARA) transcontinental persistent archive prototype (TPAP) data grid with the new integrated Rule Oriented Data System (iRODS). The goal of the project is to enable collection interoperability between UNC-CH and SDSC using an iRODS environment. This poster presents the results of one part of that project, which is the development of a crosswalk between the Odum Institute Data Archive (OIDA) Data Document Initiative (DDI) metadata and the NARA TPAP iRODS metadata catalogue (iCAT) via the OAI-PMH.
Modeling subbands of a wavelet based scalable video codec
Authors: Hendrik Eeckhaut, Dirk Stroobandt, Harald Devos, Mark Christiaens
Venue: Proceedings of the 9th WSEAS International Conference on Systems (2005)

In the RESUME project we explore the use of reconfigurable hardware for the design of portable multimedia systems by developing a hardware-friendly scalable wavelet-based video codec. Our scalable video codec provides the ability to decoded the video stream with reduced frame rate, resolution or image quality directly from the original encoded video stream. This is important for portable devices that have different Quality of Service (QoS) requirements and power restrictions. Our video codec makes use of arithmetic coding to achieve compression by exploiting statistical redundancy in video streams. This technique employs modeling for building its statistical information. In this paper we explore the use of wavelet subband models. We demonstrate that even if the available memory is extremely limited we come very close to the optimal compression.
Fair division as a means of apportioning software engineering class projects
Authors: Jon Beck
Venue: ACM SIGCSE Bulletin (2008)

In a junior- or senior-level undergraduate software engineering course that uses real-world projects for real clients, different parts of a project are inherently unequal in difficulty, time requirements, and desirability. A perennial problem is assigning portions of the project to student teams equitably. Fair division is a highly effective strategy for making an equitable, proportional, and envy-free assignment of tasks and in serving as the basis for fair grading of assignments which vary in difficulty, desirability, and time requirements.
Parametric Reconstruction of Boundaries and Surfaces for Medical Imaging
Authors: Joseph Kolibal, Daniel Howard
Venue: Proceedings of the 2007 Frontiers in the Convergence of Bioscience and Information Technologies (2007)

The design of a reliable, high-quality method for finding the boundary contour of a two-dimensional object, or for finding the surface of a three dimensional object in the presence of random noise poses difficulties but is essential to medical imaging applications as when the image is supporting evidence for a decision or when its analysis guides a medical procedure. Stochastic function recovery is a recently developed mathematical technology and we show that its application to this task allows for the recovery of these boundaries, even when the noise is quite excessive. The technique should be considered as one of several that is able to improve the visualization of medical images.
Heterogeneous Objects Modelling and Applications: Collection of Papers on Foundations and Practice, 1 edition
Authors: Alexander Pasko, Valery Adzhiev, Peter Comninos
Venue: Lecture Notes In Computer Science (2008)

Heterogeneous object modelling is a new and quickly developing research area. This book isone of the first attempts to systematically cover the most relevant themes and problems of this new and challenging subject area. It is a collection of invited papers and papers co-authored by the editors. Each chapter presents either new research results or a survey on the following topics: Formal models and abstractions of heterogeneous objects including geometric, topological, discrete and continuous models, operations forming special algebras and conversions between different model types. Data structures and algorithms for representing, modifying and computing with heterogeneous objects. Computational techniques for the design, reconstruction, optimization, analysis and simulation of heterogeneous objects that incorporate information on shape, material and physical behavior using a common framework. Applications of heterogeneous object modelling in engineering and scientific areas, including geophysical, biomedical, artistic and multi-material fabrication applications.
Distributed gradient and particle swarm optimization for multi-robot motion planning
Authors: Gerasimos g. Rigatos
Venue: Robotica (2008)

Two distributed stochastic search algorithms are proposed for motion planning of multi-robot systems: (i) distributed gradient, (ii) swarm intelligence theory. Distributed gradient consists of multiple stochastic search algorithms that start from different points in the solutions space and interact with each other while moving toward the goal position. Swarm intelligence theory is a derivative-free approach to the problem of multi-robot cooperation which works by searching iteratively in regions defined by each robot's best previous move and the best previous move of its neighbors. The performance of both approaches is evaluated through simulation tests.
A nonlinear evolution system of partial differential equations with p-Laplacian and negative nonlineariry
Authors: Nelson N. De O. Castro, Jorge Ferreira
Venue: Proceedings of the 10th WSEAS International Conference on APPLIED MATHEMATICS (2006)

In this paper we prove the existence of weak solutions of a mixed problem associated to the system {u″ + Au - δu′ - |v|ρ+2|u|ρu = f1 v″ + Av - δv′ - |u|ρ+2|v|ρv = f2 where δ is the usual Laplacian operator in Rn and A is the pseudo-Laplacian operator given by Au = -Σi=1n∂U/∂xi, with U =|∂u/∂xi|p-2 ∂u/∂xi p > 2 and ρ satisfies a technical condition.
Towards an early-warning system for global landslides triggered by rainfall and earthquake
Authors: Y. Hong, R. F. Adler
Venue: International Journal of Remote Sensing (2007)

Drawing upon the recent advances of satellite remote-sensing technology and landslide modelling techniques, a framework is proposed to attempt an early-warning system for landslide hazards after heavy rainfall and/or earthquake, the two major triggers for landslides. This framework includes three major components: (1) a landslide susceptibility information database, including geology, elevation, topography, soil, and land-cover types; (2) a real-time space-borne precipitation estimation system (http://trmm.gsfc.nasa.gov); and (3) a near-real-time ground-shaking prediction system after earthquakes (http://earthquake.usgs.gov/eqcenter/shakemap/). The ultimate goal of this framework is to rapidly predict landslide potential after large earthquakes and/or heavy rainfall by combing the dynamic triggers with landslide susceptibility information derived from high-resolution geospatial datasets. However, the challenge for integrating these real-time systems into an operational landslide prediction network and quickly disseminating alerts around the world is tremendous. It requires continued efforts and interdisciplinary collaboration in the next 2-5 years in order to realize such a system, providing early warning for landslides around the globe in a day-to-day decision-making operation.
News-on-the-go
Authors: Uwe Sandner, Florian Resatsch, Patrick Nepper, Jan Marco Leimeister, Helmut Krcmar
Venue: Proceedings of the 9th international conference on Human computer interaction with mobile devices and services (2007)

In this paper, we describe a prototype that allows users to receive news on his NFC enabled mobile phone by touching a poster on the go.
Explaining Answers from Agent Communication of Semantic Web Information
Authors: Vuong Xuan Tran, Hidekazu Tsuji
Venue: Proceedings of the 22nd International Conference on Advanced Information Networking and Applications - Workshops (2008)

In Semantic Web, an application can not only provide explicit information but also infer implicit knowledge. Besides, an answer can be also derived from multiple sources and by multiple agents. In order to trust and use such an answer, a user needs a proof and/or explanations of that answer, which contain information related to knowledge sources, systems, reasoning methods, relationships of data items, etc. In this paper, we extend our existing logical agent framework so that agents can not just reason with multiple distributed ontologies but also record proofs and provide explanations of their answers. A proof contains essential information related to a reasoning process including agents, sources of ontologies, rules, facts, etc. Then various explanations can be then generated from a proof for users, depending on their purpose and requirement. Agents are capable of creating, exchanging, and accumulating (sub-) answers along with their proofs and explanations among each other when they cooperate in solving common problems.
Prediction with expert advice for the Brier game
Authors: Vladimir Vovk, Fedor Zhdanov
Venue: Proceedings of the 25th international conference on Machine learning (2008)

We show that the Brier game of prediction is mixable and find the optimal learning rate and substitution function for it. The resulting prediction algorithm is applied to predict results of football and tennis matches. The theoretical performance guarantee turns out to be rather tight on these data sets, especially in the case of the more extensive tennis data.