ppxscal/embedding_network huggingface dataset:
Laser-induced self-organization of nano-wires on SiO2/Si interface
Authors: Artur Medvid, Igor Dmitruk, Pavels Onufrijevs, Iryna Pundyk
Venue: Microelectronics Journal (2009)

Original observation of new graded band gap structures formed on the surface of elementary Si semiconductor at studying the optical properties of Si nano-hills formed at the SiO2/Si interface by pulsed Nd:YAG laser irradiation is reported. The self-organized nano-hills on Si surface are characterized by a strong photoluminescence in the visible range of spectrum with a shoulder extended to the long-wave part of the spectrum. The feature is explained by the quantum confinement effect in nano-hills-nano-wires of gradually changing diameter.
Information security pre-assessment of u-City service
Authors: Ik-Seob Lee, DongHoon Shin, Wan S. Yi, Yu-Jae Won, Yunmook Nah
Venue: Proceedings of the 8th conference on Applied informatics and communications (2008)

The With the widespread diffusion of ubiquitous technologies such as RFID and USN, an information security assessment was carried out on the u-City service, which is under development as an example according to the information security pre-assessment methodology, in order to verify the security reliability of the service. By identifying the vulnerability of the service through an information security pre-assessment and taking the necessary information security measures against it, the safety of the new u-IT service was reinforced, and the modification costs after service launch were reduced. Consequently, it was found that an information security pre-assessment would be necessary from the development stage of the new IT service, which combines various wire/wireless IT technologies.
A Cooperative Game Theoretical Technique for Joint Optimization of Energy Consumption and Response Time in Computational Grids
Authors: Samee U. Khan, Ishfaq Ahmad
Venue: IEEE Transactions on Parallel and Distributed Systems (2009)

With the explosive growth in computers and the growing scarcity in electric supply, reduction of energy consumption in large-scale computing systems has become a research issue of paramount importance. In this paper, we study the problem of allocation of tasks onto a computational grid, with the aim to simultaneously minimize the energy consumption and the makespan subject to the constraints of deadlines and tasks' architectural requirements. We propose a solution from cooperative game theory based on the concept of Nash Bargaining Solution. In this cooperative game, machines collectively arrive at a decision that describes the task allocation that is collectively best for the system, ensuring that the allocations are both energy and makespan optimized. Through rigorous mathematical proofs we show that the proposed cooperative game in mere O(n mlog(m)) time (where n is the number of tasks and m is the number of machines in the system) produces a Nash Bargaining Solution that guarantees Pareto-optimally. The simulation results show that the proposed technique achieves superior performance compared to the Greedy and Linear Relaxation (LR) heuristics, and with competitive performance relative to the optimal solution implemented in LINDO for small-scale problems.
Predictive-conservative synchronization for commercial simulation package interoperability
Authors: Yuanxi Liang, Stephen John Turner, Boon Ping Gan
Venue: Proceedings of the 40th Conference on Winter Simulation (2008)

Distributed simulation is desired in many industries to support analysis and decision making for complex and integrated problems. Interoperating commercial simulation packages using the High Level Architecture (HLA) is a technique to fulfill this demand. Time management is an important factor in determining the execution performance when using this technique. In some simulation models, conservative synchronization does not provide good efficiency because of the high cost of requesting a time advance with every event. In this paper, we describe a user-friendly framework for interoperating AutoMod models by adopting the HLA standard with a new time management mechanism. A "departure port" mechanism identifies the characteristics of the message outgoing process and provides a dynamic safe request time to invoke the time advancing service. We conducted experiments using close-to-reality models which show that the execution time can be reduced by over 50%.
Vortex Methods for Massively Parallel Computer Architectures
Authors: Philippe Chatelain, Alessandro Curioni, Michael Bergdorf, Diego Rossinelli, Wanda Andreoni, Petros Koumoutsakos
Venue: High Performance Computing for Computational Science - VECPAR 2008: 8th International Conference, Toulouse, France, June 24-27, 2008. Revised Selected Papers (2008)

We present Vortex Methods implemented in massively parallel computer architectures for the Direct Numerical Simulations of high Reynolds numbers flows. Periodic and non-periodic domains are considered leading to unprecedented simulations using billions of particles. We discuss the implementation performance of the method up to 16k IBM BG/L nodes and the evolutionary optimization of long wavelength instabilities in aircraft wakes.
Ontology engineering: reuse and integration
Authors: E. Toppano, V. Roberto, R. Giuffrida, G. B. Buora
Venue: International Journal of Metadata, Semantics and Ontologies (2008)

Reuse and integration are major steps in the ontology development process, often unavoidable to lower the costs of a new application. We address the two issues with an engineering approach, and provide a comprehensive account of the state of the art. The domain of e-learning is chosen as a test-bed to verify the feasibility of methods. Reuse and integration are shown to be effective in constructing domain representations with larger coverage and enhanced reasoning capabilities, which significantly extend the expressiveness of semantic software. Problems emerge from the lack of explicit representations of the assumptions taken: when reusing an ontology, one implicitly commits to the underlying context. We conclude that a new methodology should be put forward that views the development as a collaborative work within a community of stakeholders.
Correlated change in normalized difference vegetation index and the seasonal trajectory of photosynthetic capacity in a conifer stand
Authors: Q. Wang, J. Tenhunen, T. Vesala
Venue: International Journal of Remote Sensing (2009)

Seasonal changes in canopy photosynthetic activity play an important role in carbon assimilation. However, few simulation models for estimating carbon balances have included them due to scarcity in quality data. This paper investigates some important aspects of the relationship between the seasonal trajectory of photosynthetic capacity and the time series of a common vegetation index (normalized difference vegetation index, NDVI), which was derived from on site micrometeorological measurements or smoothed and downscaled from satellite-borne NDVI sensors. A parameter indicating the seasonality of canopy physiological activity, PE, was retrieved through fitting a half-hour step process model, PROXELNEE, to gross primary production (GPP) estimates by inversion for carboxylation and light utilization efficiencies. The relative maximum rate of carboxylation (Vrm), a parameter that indicates the seasonality of CO2 uptake potential under prevailing temperature, was then calculated from PE and daily average air temperature. Statistical analysis revealed that there were obvious exponential relationships between NDVI and the seasonal courses for both canopy physiological activities PE and Vrm. Among them, the on-site broadband NDVI provided a robust and consistent relationship with canopy physiological activities (R2 = 0.84). The relationships between satellite-borne NDVI time series with instantaneous canopy physiological activities at the time of satellite passing were also checked. The results indicate that daily step NDVI time series (data downscaled from composite temporal resolution NDVI) better represent the daily average activity of the canopy. These findings may enable us to retrieve the seasonal course of canopy physiological activity from widely available NDVI data series and, thus, to include it into carbon assimilation models. However, both smoothing methods for satellite-borne NDVI time series may generate incorrect estimates and must be treated with care.
Feature selection in bankruptcy prediction
Authors: Chih-Fong Tsai
Venue: Knowledge-Based Systems (2009)

For many corporations, assessing the credit of investment targets and the possibility of bankruptcy is a vital issue before investment. Data mining and machine learning techniques have been applied to solve the bankruptcy prediction and credit scoring problems. As feature selection is an important step to select more representative data from a given dataset in data mining to improve the final prediction performance, it is unknown that which feature selection method is better. Therefore, this paper aims at comparing five well-known feature selection methods used in bankruptcy prediction, which are t-test, correlation matrix, stepwise regression, principle component analysis (PCA) and factor analysis (FA) to examine their prediction performance. Multi-layer perceptron (MLP) neural networks are used as the prediction model. Five related datasets are used in order to provide a reliable conclusion. Regarding the experimental results, the t-test feature selection method outperforms the other ones by the two performance measurements.
Media Actors: Characters in Search of an Author
Authors: Flavia Sparacino, Glorianna Davenport, Alex Pentland
Venue: Proceedings of the 1999 IEEE International Conference on Multimedia Computing and Systems - Volume 02 (1999)

Interactive experiences benefit from natural interactions, compelling communication, and ease of implementation. We show how, according to these principles, interactive media architectures can be categorized as scripted, responsive, learning, or behavioral, and give examples of applications in each category. We then propose the perceptive architecture based on Media Actors. We endow media objects - expressive text, photographs, movie clips, audio, and sound clips - with coordinated perceptual intelligence, behaviors, and personality. Such media actors are able to engage the public in an encounter with a virtual character which expresses itself through one or more of these agents. The result is a novel method for interactive media modeling which finds applications in multimedia, electronic art, interactive performance, and entertainment.
A QoS-Aware Heuristic Algorithm for Replica Placement
Authors: Hsiangkai Wang, Pangfeng Liu, Jan-jan Wu
Venue: Proceedings of the 7th IEEE/ACM International Conference on Grid Computing (2006)

This paper studies the QoS-aware replica placement problem. Although there has been much work on replica placement problem, most of them concerns average system performance and ignores quality assurance issue. Quality assurance is very important, especially in heterogeneous environments. We propose a new heuristic algorithm that determines the positions of replicas in order to satisfy the quality requirements imposed by data requests. The experimental results indicate that the proposed algorithm finds a near-optimal solution effectively and efficiently for algorithm can also adapt to various parallel and distributed environments.
Architectures and performance evaluation of bandwidth brokers
Authors: Christos Bouras, Dimitris Primpas
Venue: International Journal of Network Management (2009)

DiffServ is the basis of contemporary QoS-enabled networks. Setting up DiffServ QoS requires extensive engineering effort in dimensioning and provisioning, especially for adjacent networks under different administrations linked in a 'federated' hierarchy. The bandwidth broker is an entity that is responsible for the management of the resources and the QoS service operation in an automated way. In this paper, we present, test and compare two different architectures of bandwidth brokers: a centralized one and a distributed one. We also deal with the inter-domain operation of the bandwidth broker in order to perform end-to-end provisioning. The paper presents the relevant aspects for inter-domain operation of a bandwidth broker and focuses on pathfinding issues. We discuss two models for inter-domain routing through bandwidth brokers, analyzing their advantages and comparing them.
Definition and Construction of Multi-prover Zero-Knowledge Argument
Authors: Chunming Tang, Zheng-an Yao
Venue: Proceedings of the 2009 WRI International Conference on Communications and Mobile Computing - Volume 03 (2009)

Multi-prover zero-knowledge proof is an interesting proof in which a few provers synchronously prove validity of a statement to an verifier, however, the verifier will learn nothing beyond the fact that the statement is correct. We call multi-prover zero-knowledge proof as multi-prover zero-knowledge arguments if all provers are probabilistic polynomial-time participants. In this paper, we give the formal definition of multi-prover zero-knowledge argument and construct it based on discrete logarithm problem (DLP).
Multimedia Standards: Present and Future
Authors: Fernando Pereira
Venue: Proceedings of the IEEE International Conference on Multimedia Computing and Systems - Volume 2 (1999)

Multimedia services and applications, from videotelepnony and digital television to multimedia databases and 3D virtual environments, are undoubtedly among the novelties of the end of the century, already announcing the big changes that will characterize the XXIst century society.With the explosion of new techniques and methods in all scientific areas related to multimedia, standardization bodies assume a fundamental role of coordination and even steering thus avoiding the birth of a chaotic multimedia market with all its negative effects. "A standard should be like a contract. A process by which individuals recognize the advantage of doing certain things in an agreed way and codify that agreement in a contract, we compromise between what we want to do and what others want to do. Though it constraines our freedom, we usually enter into such an agreement because the perceived advantages exceed the perceived disadvantages". In conclusion, the main advantage of a standard is the increased interoperability, and the possibilty to substantially increase the number of users due to the existence of a generalized agreement. 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
Estimation of Evapotranspiration Using Fused Remote Sensing Image Data and Energy Balance Model for Improving Water Management in Arid Area
Authors: Ayoub Almhab, Ibrahim Busu
Venue: Proceedings of the 2009 International Conference on Computer Engineering and Technology - Volume 02 (2009)

Remote sensing has proved to be very useful in the investigation of vegetation and hydrological monitoring, especially when studying vast areas. In this paper, the complement between two optical remote sensing data (Landsat TM and NOAA- AVHRR) and a Digital Elevation Model (DEM) is used to estimate hydrological parameters based on derived surface reflectance. These parameters which are used in the Modified Soil Energy Balance Algorithm for Land (M-SEBAL) model have been used to estimate net radiation, soil heat flux, sensible heat flux and evapotranspiration (ET) for Sana’a Basin in Yemen. The area is known for arid and semi-arid weather conditions with undulating topography. Image data from AVHRR on-board NOAA satellites with a large areal coverage, good temporal and spectral resolution are found to be very useful in generating some parameters required for the above process. However, the data have poor spatial resolution. On the other hand, image data from the Thematic Mapper on-board the Landsat satellite, with a high spatial and spectral resolution should be able to provide values for the parameters involved, but the area coverage is significantly reduced. This study has been carried out, using a data fusion technique in order to exploit the respective advantages of these two disparate sources of image data. A general framework is then proposed to generate ET maps for arid and semi-arid regions. This is achieved by means of multi-temporal, multi-resolution remote sensing data. Taking into account topographic effects, an attempt has also been made to incorporate DEM information for estimating the net radiation of the areas involved. An application for computing a daily ET map over Sana’a Basin, Yemen is presented. As a result, a daily ET map generated from meteorological observations was compared with estimated ET data simulated from remote sensing data. In conclusion, data from both remote sensing sources give reasonable values with the result from the TM being better than those obtained from the AVHRR. This is attributed to the differences in spatial resolution, in which TM data is higher than AVHRR. The fusion of the two shows improves spatial detail whilst maintaining the spectral signature close to the original.
Pick-by-Vision comes on age: evaluation of an augmented reality supported picking system in a real storage environment
Authors: Rupert Reif, Willibald A. Günthner, Björn Schwerdtfeger, Gudrun Klinker
Venue: Proceedings of the 6th International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa (2009)

Order picking is one of the most important process steps in logistics. Because of their flexibility human beings cannot be replaced by machines. But if workers in order picking systems are equipped with a head-mounted display, Augmented Reality can improve the information visualization. In this paper the development of such a system -- called Pick-by-Vision - is presented. The system is evaluated in a user study performed in a real storage environment. Important logistics figures as well as subjective figures were measured. The results show that a Pick-by-Vision system can improve considerably industrial order picking processes.
Conjunctive Grammars with Restricted Disjunction
Authors: Alexander Okhotin, Christian Reitwießner
Venue: Proceedings of the 35th Conference on Current Trends in Theory and Practice of Computer Science (2009)

It is shown that every conjunctive language is generated by a conjunctive grammar of a special form, in which every nonterminal A has at most one rule of the general form A &rarr;&alpha; 1 ... &alpha; n , while the rest of the rules for A must be of the type A &rarr;w, where w is a terminal string. For context-free grammars, a similar property does not hold (S. A. Greibach, W. Shi, S. Simonson, &ldquo;Single tree grammars&rdquo;, 1992).
Supporting remote tangible robotic entertainment
Authors: Akihiro Furuhira, Wynand Marais, Bruce Thomas
Venue: Proceedings of the 2008 International Conference on Advances in Computer Entertainment Technology (2008)

Enjoying a game with friends and family over a large distance is quite challenging, as many games require physical pieces and a board. One strategy is to remove the game pieces, and make the entire game virtual. We are investigating how play games with physical pieces at multiple remote locations. The goal of this project is to implement a large scale version of the Remote Active Tangible Interface (RATI) [1]. The original RATI was built with the Display Based Measurement and Control System (DBMCS). RTAI was constructed and evaluated with one robot on two remote tables.
A Conservative Feature Subset Selection Algorithm with Missing Data
Authors: Alex Aussem, Sergio Rodrigues de Morais
Venue: Proceedings of the 2008 Eighth IEEE International Conference on Data Mining (2008)

This paper introduces a novel conservative feature subset selection method with incomplete data sets. The method is conservative in the sense that it selects the minimal subset of features that renders the rest of the features independent of the target (the class variable) without making any assumption about the missing data mechanism. This is achieved in the context of determining the Markov blanket of the target that reflects the worst-case assumption about the missing data mechanism, including the case when data is not missing at random. An application of the method on synthetic incomplete data is carried out to illustrate its practical relevance. The method is compared against state-of-the-art approaches such as the {expectation maximization} (EM) algorithm and the available case technique.
IEEE Std 1500 Enables Modular SoC Testing
Authors: Erik Jan Marinissen, Yervant Zorian
Venue: IEEE Design Test (2009)

IEEE Std 1500 enables modular SoC testing, not only for core-based testing, but also for divide-and-conquer test generation and test reuse. This article provides a brief tutorial on the standard and illustrates its usage through two application case studies.
Application of business subsystem for production monitoring
Authors: Ivan Grbavac, Vedran Batos, Kresimir Fertalj
Venue: Proceedings of the 8th conference on Simulation, modelling and optimization (2008)

The large companies business processes, especially in production, depend on IT (Information Technology) infrastructure, including one or more of various computing environments as NW (Network), DB (Database) and SW (software) modules needed for the implementation, management and monitoring of the business activities. The worldwide implementation of ERP (Enterprise Resource Planning) systems shows the lack of the parameters needed for the sufficient monitoring of the production processes. This paper, based on analysis of the requirements in various industries, recommends software subsystem useful for the production monitoring tasks.
Theoretical results on the power efficiency versus spectral efficiency compromise of wireless transmitters
Authors: José Carlos Pedro
Venue: Proceedings of the 8th conference on Simulation, modelling and optimization (2008)

This paper describes some recent theoretical results on the compromise between power efficiency and spectral efficiency that limits the performance of nowadays wireless transmitters. Using only the energy conservation principle, we prove that spectral efficiency, and thus ideal amplitude modulation linearity, can not be achieved in the usual current-mode power amplifier (PA), unless power efficiency is sacrificed. However, we also show that this compromise can be lifted in case of a PA with power supply modulation, as is used in the polar transmitter, and we discuss some of its most important practical implementation challenges.
Mobile prepayment solution for meter based on new generation communication
Authors: Pan Tie-Jun, Zheng Lei-na, Fang Cheng-bin, Zhang Hua-jun, Jin Jian-suai, Wu Gui-yang
Venue: Proceedings of the 3rd WSEAS international conference on Computer engineering and applications (2009)

We present a set of mobile prepayment solution in which the prepayment meter (PM) system is implemented without smart card and user need not go to agency by oneself for prepayment. For the purpose of solving the difficult problem of utility meter prepayment at the specific location in person, mobile payment client (MPC) with graph user interface (GUI) located on mobile device which is responded for business initiation. PM is connected to PS via Zigbee network and the 3rd generation wireless communication infrastructure (3G) and utility meter may connect Zigbee node via RS485 bus. By means of identification and mutual authentication which generating different session key with time stamp every time, the cross validation mechanism based on PKI among PM, MPC and PS improve the security of mobile prepayment system. The security mechanism is given in the end including user identification, mutual authentication, data integrity and data confidentiality. The result of the present work implied that mobile phone is gradually becoming a data access and exchange platform of mobile payment. It will be an important role in mobile prepayment meter system.