ppxscal/embedding_network huggingface dataset:
Dual-Policy Attribute Based Encryption
Authors: Nuttapong Attrapadung, Hideki Imai
Venue: Proceedings of the 7th International Conference on Applied Cryptography and Network Security (2009)

We present a new variant of Attribute based encryption (ABE) called Dual-Policy ABE. Basically, it is a conjunctively combined scheme between Key-Policy and Ciphertext-Policy ABE, the two previous available types of ABE. Dual-Policy ABE allows simultaneously two access control mechanisms over encrypted data: one involves policies over objective attributes ascribed to data and the other involves policies over subjective attributes ascribed to user credentials. The previous two types of ABE can only allow either functionality above one at a time.
An Agent-Based Model for the Adaptation of Processing Efficiency for Prioritized Traffic
Authors: Sanja Illes, Dragan Jevtic, Marijan Kunstic
Venue: Proceedings of the Third KES International Symposium on Agent and Multi-Agent Systems: Technologies and Applications (2009)

The increasing number and variety of telecommunication services being offered by networks have emphasized the demand for optimized load management strategies. Obtainable processing efficiency is one of the key elements for all services and has to be dominantly supervised. Different priority levels and classifications can co-exist to support services, such fine regulation of precedence mixed with hard and destructive priority for critical service classes. Intelligent processing efficiency management with adaptive protection of predefined processing power can support such requests. This paper deals with the regulation of packets moving towards service-processing resources. Regulation is based on service priorities and processing load in the agent-controlled part of the network.
On runtime service quality models in adaptive ad-hoc systems
Authors: Christian Peper, Daniel Schneider
Venue: Proceedings of the 2009 ESEC/FSE workshop on Software integration and evolution @ runtime (2009)

Ad-hoc computer systems can automatically realize higher services when at least two distributed and communicating (embedded) devices come together. For this purpose, they must able to manage appearance and loss of devices and resources, and they have to adapt to changes in requirements and environment. Based on a component-oriented approach for adaptive ad-hoc systems, this paper suggests a high-level service quality reference model to advocate further research on the quality matching problem between service provider and client components.
The relation of homework type to achievement and retention of students enrolled in intermediate algebra
Authors: Susan R. Fife
Venue:  (2008)

The primary purpose of the dissertation was to determine if there were significant differences in academic achievement of Intermediate Algebra students who have been assigned online homework and Intermediate Algebra students who have been assigned traditional homework from the course textbook. A quasi&mdash;experimental pretest&mdash;posttest nonrandomized research design was used to test the hypothesis of this study.The control group used in this study consisted of 72 community college students who were assigned homework from the textbook. The experimental group consisted of 91 community college students who were assigned online homework. An analysis of covariance was use to analyze differences between achievement of the two groups. The results indicated that there is not a statistically significant difference (F = 3.80, p = .054) between the achievement of the groups. However, the effect size obtained (&Delta; = +0.34) indicated that achievement differences between the groups is educationally significant. Retention rates between groups were analyzed using the chi-square test and indicated no significant differences (&chi;2 = 0.61, p = .433) in retention rates between the groups. 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
Dynamic pattern recognition and data storage using localized holographic recording
Authors: Ali Adibi
Venue:  (2008)

A new technique for optical pattern recognition with two-center recording of persistent holograms in doubly doped LiNbO3:Fe:Mn crystal is presented, by which the holograms are localized in separate slices along the recording medium. The localized recording method has the distinctive advantage of selective recording and erasure of the individual holograms without affecting the entire holographic recording medium. This capability enables dynamic content modification of the optical pattern recognition systems. Also, the diffraction efficiency of localized holograms is much larger than that of the normal volume multiplexed holograms. It is theoretically shown that the localized holographic correlator (LHC) outperforms the conventional volume holographic correlators in terms of crosstalk, shift invariance, and capacity. The LHC is experimentally demonstrated. Several persistent holograms are localized within separate slices as close as 33 &mu;m apart along the crystal. The excessive diffraction efficiency of the localized holograms is employed to enhance the LHC robustness through multiplexing several holograms per pattern within individual slices of the recording medium.A holographic data storage system based on two-center holographic recording in a doubly doped LiNbO3:Fe:Mn crystal is developed with angular multiplexing capability. The associated imaging system has been optimized for the pixel matching of pixelated bit patterns generated by a spatial light modulator (SLM) through the recording medium onto a camera. The initial multiplexed holograms show promising contrast of dark and bright pixels. With the optimized imaging system of the developed holographic memory, the implementation of a dynamic read/write data storage system with localized recording is envisioned. The large diffraction efficiency of the localized holograms enables multilevel (M-ary) data coding to improve the storage density of the system.
Directory Based Registration in Public Key Infrastructures
Authors: M. Lippert, E. Karatsiolis, A. Wiesmaier, J. Buchmann
Venue: Proceeding of the 2005 conference on Applied Public Key Infrastructure: 4th International Workshop: IWAP 2005 (2005)

Certificate life-cycle management operations, especially the initial registration of users, are important but expensive tasks in Public Key Infrastructures. In this paper we propose a mechanism that integrates these tasks with established processes, technology and data. Our approach is based on directory services that are usually already employed by companies, public administration and similar organizations for non-PKI purposes. It spares additional personell and is less error-prone, since the utilized processes are already set up and known to administrative personell and users. This reduces the costs to bootstrap and operate a Public Key Infrastructure. We show a case study about the proposed mechanism that was conducted at the Technische Universität Darmstadt in Germany in order to supply 20,000 students with certificates and keys.
Optimization-based posture prediction for human upper body
Authors: Zan Mi, Jingzhou (james) Yang, Karim Abdel-malek
Venue: Robotica (2009)

A general methodology and associated computational algorithm for predicting postures of the digital human upper body is presented. The basic plot for this effort is an optimization-based approach, where we believe that different human performance measures govern different tasks. The underlying problem is characterized by the calculation (or prediction) of the human performance measure in such a way as to accomplish a specified task. In this work, we have not limited the number of degrees of freedom associated with the model. Each task has been defined by a number of human performance measures that are mathematically represented by cost functions that evaluate to a real number. Cost functions are then optimized, i.e., minimized or maximized, subject to a number of constraints, including joint limits. The formulation is demonstrated and validated. We present this computational formulation as a broadly applicable algorithm for predicting postures using one or more human performance measures.
Nondissipative and energy-stable high-order finite-difference interface schemes for 2-D patch-refined grids
Authors: R. M. J. Kramer, C. Pantano, D. I. Pullin
Venue: Journal of Computational Physics (2009)

A class of finite-difference interface schemes suitable for two-dimensional cell-centered grids with patch-refinement and step-changes in resolution is presented. Grids of this type are generated by adaptive mesh refinement methods according to resolution needs dictated by the physics of the problem being modeled. For these grids, coarse and fine nodes are not aligned at the mesh interfaces, resulting in hanging nodes. Three distinct geometries are identified at the interfaces of a domain with interior patch-refinement: edges, concave corners and convex corners. Asymptotic stability in time of the numerical scheme is achieved by imposing a summation-by-parts condition on the interface closure, which is thus also nondissipative. Interface stencils corresponding to an explicit fourth-order finite-difference scheme are presented for each geometry. To preserve stability, a reduction in local accuracy is required at the corner geometries. It is also found that no second-order accurate solution exists that satisfies the summation-by-parts condition. Tests using the 2-D scalar advection equation and an inviscid compressible vortex support the stability and accuracy of these stencils for both linear and nonlinear problems.
Formalising dynamic protocols for open agent systems
Authors: Alexander Artikis
Venue: Proceedings of the 12th International Conference on Artificial Intelligence and Law (2009)

Multi-agent systems where the members are developed by parties with competing interests, and where there is no access to a member's internal state, are often classified as 'open'. The specification of open agent systems of this sort is largely seen as a design-time activity. Moreover, there is no support for run-time specification modification. Due to environmental, social, or other conditions, however, it is often required to revise the specification during the system execution. To address this requirement, we present an infrastructure for 'dynamic' specifications, that is, specifications that may be modified at run-time by the agents. The infrastructure consists of well-defined procedures for proposing a modification of the 'rules of the game' as well as decision-making over and enactment of proposed modifications. We employ the action language C+ to formalise dynamic specifications, and the 'Causal Calculator' implementation of C+ to execute the specifications. We illustrate our infrastructure by presenting a dynamic specification of a resource-sharing protocol.
Distributed architectures for electronic cash schemes: a survey
Authors: Isabelle Simplot-Ryl, Issa Traore, Patricia Everaere
Venue: International Journal of Parallel, Emergent and Distributed Systems (2009)

The volume of E-commerce transactions has considerably increased in the last several years. One of the most important aspects of such progress is the efforts made to develop and deploy dependable and secure payment infrastructures. Among these infrastructures is electronic cash, which is an attempt to reproduce the characteristics of paper cash in online transactions. Electronic cash schemes have so far been the purpose of a significant amount of research work. Although real-life deployments of such schemes are expected to take place in highly distributed environments, limited attention has been paid in the literature on underlying architectural issues. So far the focus has mostly been on addressing only security issues. However, for real-life deployment, distributed processing criteria such as performance, scalability and availability are of prime importance. In this paper, through a survey of the literature, we identify and analyse the different distributed architectural styles underlying existing e-cash schemes. We discuss the strengths and limitations of these architectures with respect to fundamental system distribution criteria. In light of such discussion, we make some recommendations for designing effective distributed e-cash systems from an architectural perspective.
Programmable Switched Capacitor Finite Impulse Response Filter with Circular Memory Implemented in CMOS 0.18 μm Technology
Authors: Rafał Długosz, Krzysztof Iniewski
Venue: Journal of Signal Processing Systems (2009)

This paper presents a programmable multi-mode finite impulse response (FIR) filter implemented as switched capacitor (SC) technique in CMOS 0.18 μm technology. Intended application of the described circuit is in analog base-band filtering in GSM/WCDMA systems. The proposed filter features a regular structure that allows for elimination of some parasitic capacitances, thus significantly improving the filtering accuracy. Due to its modularity that allows for dividing the circuit into two separate sections, the circuit can be easily reconfigured to work as either infinite impulse response (IIR) or as finite impulse (FIR) filter. One of the key components that allows for this multi-mode operation is the proposed programmable and ultra low power multiphase clock circuit. The 24-taps filter for the sampling frequency of 30 MHz dissipates power of 4.5 mW from a 1.8 V supply.
ItemSpider: Social Networking Service That Extracts Personal Character from Individual's Book Information
Authors: Tetsuya Tsukamoto, Hiroyuki Nishiyama, Hayato Ohwada
Venue: Knowledge Acquisition: Approaches, Algorithms and Applications: Pacific Rim Knowledge Acquisition Workshop, PKAW 2008, Hanoi, Vietnam, December 15-16, 2008, Revised Selected Papers (2009)

In this study, we develop a social networking service that extracts personal character from a user's book information. This system can share a user's personal book collection with other users and support the formation of a new community by providing the user's friends with a link to his/her book information. We define the user attribute as a vector comprising the book's details (e.g., author and publisher). For a set of users having the same books, a user clustering experiment was conducted on the basis of the user attribute value. In the experiment, users having the same books were observed to be classified in a group.
Designing a Geo-scientific Request Language - A Database Approach
Authors: Peter Baumann
Venue: Proceedings of the 21st International Conference on Scientific and Statistical Database Management (2009)

A large part of sensor, image, and statistics data in the Earth Sciences naturally come as data points aligned to regular grids of some dimension, including 1-D time series, 2-D imagery, 3-D image time series and volumetric data, and 4-D spatio-temporal data. Frequently repositories have to host objects of multi-Terabyte size, in the future multi-Petabytes. Serving this information category, large multi-dimensional arrays, is a task of increasing importance among the Earth Sciences. Still, however, ad-hoc implementations with focused functionality prevail which lack the flexibility of SQL-enabled databases.The Web Coverage Processing Service (WCPS) geo raster model and language allows navigation, extraction, and ad-hoc analysis on multi-dimensional geoscientific raster data which can be geo-referenced or not. The request language has been designed to offer some key properties considered advantageous by the database community: it is formalized, declarative, data independent, optimizable, and safe in evaluation. WCPS has been adopted as an international standard by the Open GeoSpatial Consortium (OGC) in December 2008. The reference implementation is almost finished. Actually, the embedding into the modular framework of the OGC geo service standards has posed particular con straints which the design had to respect. We discuss conceptual model, query language, and the context using real-life use case scenarios.
Oscillation criteria for a first-order impulsive neutral differential equation of Euler form
Authors: Kaizhong Guan, Jianhua Shen
Venue: Computers Mathematics with Applications (2009)

In this paper, we are concerned with the oscillation of a first-order impulsive neutral differential equation of Euler form with variable delays. Our results reveal the fact that the oscillatory behavior of all solutions of differential equations without impulses can be inherited by impulsive differential equations under certain impulsive perturbations. It is also seen that the oscillatory properties of all solutions of impulsive differential equations may be caused by the impulsive perturbations, though the corresponding differential equations without impulses admit a nonoscillatory solution. Some examples are also given to illustrate the applicability of the results obtained.
Instrumental listening: Sonic gesture as design principle
Authors: Doug Van nort
Venue: Organised Sound (2009)

In the majority of discussions surrounding the design of digital instruments and real-time performance systems, notions such as control and mapping are seen from a classical systems point of view: the former is often seen as a variable from an input device or perhaps some driving signal, while the latter is considered as the liaison between input and output parameters. At the same time there is a large body of research regarding gesture in performance that is concerned with the expressive and communicative nature of musical performance. While these views are certainly central to a conceptual understanding of ‘instrument’, it can be limiting to consider them a priori as the only proper model, and to mediate one’s conception of digital instrument design by fixed notions of control, mapping and gesture. As an example of an alternative way to view instrumental response, control structuring and mapping design, this paper discusses the concept of gesture from the point of view of the perception of human intentionality in sound and how one might consider this in interaction design.
The principal components analysis - method to reduce the collinearity in multiple linear regression model: application in medical studies
Authors: Cristina Gena Dascalua, Corina Dima Cozma
Venue: Proceedings of the 2nd WSEAS international conference on Multivariate analysis and its application in science and engineering (2009)

During the statistical analysis of medical data, in many situations it is necessary to identify the multiple correlations established between the studied parameters. In this purpose, one of the most useful methods is to build a model of multiple regression, which allows the modeling of a dependant variable values having at least the ordinal type, based on its linear relation with more than one independent variables satisfying the same restriction, called predictors. The main problem which affects the efficiency of such a model is the collinearity between predictors - a clue that they are not selected well because they overlap each other. There are different methods to eliminate this difficulty, but a very efficient one is the principal components analysis, applied as a method to reduce the predictors number, in a step preliminary to the regression model building. We will present the results obtained using these procedures on a set of 212 patients from three categories: healthy patients (65 cases), patients with liver cirrhosis (65 cases) and patients with liver hepatitis (82 cases), included into a study about the connections between the liver diseases and the heart's health - measured using detailed electrocardiograms. The study's purpose was to find if we can extract, using the heart's activity analysis, certain conclusions about the liver's state of health. The identified predictors are useful for further data processing.
Quantum optical communications system for micro robots
Authors: Timothy Grotjohn
Venue:  (2008)

One way to improve the acquisition of planetary information from robotic landers is to use many smaller robotic explorers that can cover more ground than a single conventional rover. The development of such robots presents very significant technological challenges to enable essential functions, such as mobility and communication, given the small size and limited power generation capability. The research presented here has been focused on developing a communications system that has the potential for providing ultra-low power communications for robots such as these. The communication system is a variant of photon-counting based communications. Instead of counting individual photons the system only counts the arrival of time coincident sets of photons that have distinct correlations. The utilization of sets of photons significantly decreases the bit error rate because they are highly identifiable in the presence of ambient light. The sets of photons can be generated in two ways. Quantum Entangled photons are one such set that can be generated through Spontaneous Parametric Down Conversion. This process is not energy efficient, but Quantum Entangled photons have an effective range that is hundreds of times greater than for photon sets that are not entangled. This is due to the highly correlated momenta for entangled photons, which translates into positional correlation in the transmitted beam. A transmitter based on quantum entangled photons was built and tested. A one bit value was coded by sending photons of like polarization and a zero bit value was coded by sending photons with orthogonal polarizations. The system successfully transmitted data at a remarkably low power level, a received optical power of 1 Pico joule per bit, in the presence of significant background noise. The second way to generate sets of photons is to utilize multiple sources that are pulsed simultaneously. This has the benefit of being much more energy efficient than a Quantum Entangled photon source. A transmitter utilizing this concept was built for evaluation. The components used in this system were chosen so that they could in the future be integrated into a cubic centimeter device. The experimental system was able to achieve a Bit Error Rate of 10 -3 while transmitting data at a rate of 100 Kbits/sec over a distance of 70 meters with a background level that was above the signal level (received Signal to Noise Ratio was -0.7 dB) using only 760 pW of transmitted power. Even with very low electrical to optical energy efficiency &sim;1%, an optimized optical system utilizing this technique would still use only 76 nw of electrical power. This is a power level that can be sustained by a power scavenging micro robot. The operating characteristics of this system have been modeled and used to extrapolate future performance improvements that can be achieved utilizing improved components that can be readily built.