ppxscal/embedding_network huggingface dataset:
Improving computer science diversity through summer camps
Authors: Dennis P. Groth, Helen H. Hu, Betty Lauer, Hwajung Lee
Venue: ACM SIGCSE Bulletin (2008)

Summer camps offer a ripe opportunity for increasing computer science diversity. This panel provides several examples of summer camps that specifically recruit from traditionally underrepresented demographics. The panelists run camps at a community college, a private liberal-arts college, and public universities. The camps are residential and day camps, coed and all-female camps, ranging from three-days to two-weeks long, with campers from 10-years-olds to high school seniors. In addition to describing their camps, the panelists will provide information on securing funding, recruiting campers from underrepresented populations, measuring impact, and lessons learned along the way. Demonstrations of what campers accomplished will also be shown.
High accuracy handwritten Chinese character recognition using LDA-based compound distances
Authors: Tian-Fu Gao, Cheng-Lin Liu
Venue: Pattern Recognition (2008)

To improve the accuracy of handwritten Chinese character recognition (HCCR), we propose linear discriminant analysis (LDA)-based compound distances for discriminating similar characters. The LDA-based method is an extension of previous compound Mahalanobis function (CMF), which calculates a complementary distance on a one-dimensional subspace (discriminant vector) for discriminating two classes and combines this complementary distance with a baseline quadratic classifier. We use LDA to estimate the discriminant vector for better discriminability and show that under restrictive assumptions, the CMF is a special case of our LDA-based method. Further improvements can be obtained when the discriminant vector is estimated from higher-dimensional feature spaces. We evaluated the methods in experiments on the ETL9B and CASIA databases using the modified quadratic discriminant function (MQDF) as baseline classifier. The results demonstrate the superiority of LDA-based method over the CMF and the superiority of discriminant vector learning from high-dimensional feature spaces. Compared to the MQDF, the proposed method reduces the error rates by factors of over 26%.
Computing with snakes in directed networks of automata
Authors: S. Even, A. Litman, P. Winkler
Venue: Proceedings of the 31st Annual Symposium on Foundations of Computer Science (1990)

Directed, strongly connected networks of finite-state automata, of bounded in- and outdegree but unknown topology and unbounded size n, are considered. Protocols that are quadratic or linear in n and accomplish the following tasks are provided: waking up and reporting when done, constructing smart spanning trees out from the root and in to the root, conducting breadth-first and depth-first searches, sending a message from the endpoint of a (directed) edge to its startpoint, running a slow clock, and solving the firing squad synchronization problem. The protocols are highly parallel and entail the use of sequences of signals called 'snakes''. All the tasks are accomplished in less time than is possible with any previously known techniques.
A delay independent stability criterion for fpPID controller
Authors: Luis H. García I., Jose F. Solís V., Omar J. Santos S., Ramón Soto C.
Venue: Proceedings of the 7th WSEAS International Conference on Applied Mathematics (2005)

The fpPID controller is a modified version of the well known PID controller, whose derivative component has been replaced by a fuzzy time series predictor. Such controller has shown good performance in simulation, but an important issue when modifying standard PID architecture is it's stability. In this paper we present delay independent conditions for fpPID controller stability. Such conditions were obtained using the LMI approach and the Lyapunov Krasovskii Theorem.
Cross-industry Preferences for Development of Mobile Payments in Switzerland
Authors: Jan Ondrus, Yves Pigneur
Venue: Electronic Markets (2007)

In this paper we present a study that unveils the technological and organizational preferences of various industries for mobile payment developments in Switzerland. Despite the expected success, mobile payments remain at an early stage of development in most countries. At this point, there is a real need for better understanding of the factors hindering the deployment of mobile payments. We conducted several series of interviews involving key Swiss experts to elicit the preferences of the different industries involved in the mobile payment market. The findings indicate that card-based solutions are still preferred to mobile phone-based solutions from an industry point of view. However, in terms of industrial settings, the situation is not as clear for determining the dominant actors who would lead mobile payments solutions in the future. At this stage, this study already reveals some weak market signals concerning the future developments of mobile payments in Switzerland.
Engineering Web Services by Exploiting Internet Middleware Capabilities
Authors: Dionisis X. Adamopoulos
Venue: Proceedings of the Fourth International Conference on Networking and Services (2008)

Web services are emerging technologies that can be considered as the result of the continuous improvement of Internet services due to the tremendous increase in demand that is being placed on them. In this paper, the different facets of Web services are identified and a flexible approach to engineering complex Web services is adopted in the form of a proposed framework for the development of Web services. After the examination of its main constituent parts, it is argued that its full potential and that of Web service engineering in general, is realized through the gradual formation of a rich service grid offering value-added supporting functionality and therefore the main desirable properties of such a service grid are highlighted. Finally, the paper outlines a validation approach for the proposed framework and assembles important pointers for future work and concluding remarks.
Flow boiling of FC-72 from a screen laminate extended surface matrix
Authors: B. Holland, N. Ozman, R. A. Wirtz
Venue: Microelectronics Journal (2008)

An investigation is conducted to assess the thermal performance of multi-layered screen laminates when used as porous extended surface matrices (ESMs) in vertical up flow boiling. A dielectric coolant (FC-72) is used as the working fluid. Four specimens are constructed having different mesh-geometries and/or number of layers. Channel Reynolds numbers are varied from 2700 to 8500 and ESM base superheats are varied from 0 to 40^oC. Results indicate that devices equipped with this technology can tolerate steady heat fluxes in excess of 100W/cm^2 (based on the base cross section area of the ESM) with corresponding ESM base superheats below 30^oC. Thermal performance (the increase in heat flux at a given superheat) increases by as much as 30% for a 3-fold increase in Reynolds number. The total capacity of the ESM (the product of heat flux and base cross section area) increases approximately linearly with ESM thickness. A feature of this technology is that it greatly extends the heat flux working range over an unenhanced surface.
Data Integration in Oil and Gas at Norwegian Continental Shelf
Authors: Kari Anne Haaland Thorsen, Chunming Rong
Venue: Proceedings of the 22nd International Conference on Advanced Information Networking and Applications - Workshops (2008)

Modern oil and gas industry is to a large extent a knowledge- and information-industry, and techniques from computer science and informatics can make significant contributions to productivity and environment protection. As oil production from the Norwegian continental shelf diminishes, new technologies can improve the recovery factor from existing fields. The project group IDP-D&C is appointed to answer the need for more sophisticated drilling and completion processes. Focuses are on the integration of offshore and onshore, real-time simulation and optimizing of key work processes, and integrated operation centres of operators and vendors.
Mining relationships among interval-based events for classification
Authors: Dhaval Patel, Wynne Hsu, Mong Li Lee
Venue: Proceedings of the 2008 ACM SIGMOD international conference on Management of data (2008)

Existing temporal pattern mining assumes that events do not have any duration. However, events in many real world applications have durations, and the relationships among these events are often complex. These relationships are modeled using a hierarchical representation that extends Allen's interval algebra. However, this representation is lossy as the exact relationships among the events cannot be fully recovered. In this paper, we augment the hierarchical representation with additional information to achieve a lossless representation. An efficient algorithm called IEMiner is designed to discover frequent temporal patterns from interval-based events. The algorithm employs two optimization techniques to reduce the search space and remove non-promising candidates. From the discovered temporal patterns, we build an interval-based classifier called IEClassifier to differentiate closely related classes. Experiments on both synthetic and real world datasets indicate the efficiency and scalability of the proposed approach, as well as the improved accuracy of IEClassifier.
Finite automata for testing composition-based reconstructibility of sequences
Authors: Qiang Li, Huimin Xie
Venue: Journal of Computer and System Sciences (2008)

Symbolic sequences uniquely reconstructible from all their substrings of length k compose a regular factorial language. We thoroughly characterize this language by its minimal forbidden words, and explicitly build up a deterministic finite automaton that accepts it. This provides an efficient on-line algorithm for testing the unique reconstructibility of the sequences.
Visualization of the Nordic academic web: Link analysis using social network tools
Authors: José Luis Ortega, Isidro F. Aguillo
Venue: Information Processing and Management: an International Journal (2008)

The aim of this paper is to study the link relationships in the Nordic academic web space - comprised of 23 Finnish, 11 Danish and 28 Swedish academic web domains with the European one. Through social networks analysis we intend to detect sub-networks within the Nordic network, the position and role of the different university web domains and to understand the structural topology of this web space. Co-link analysis, with asymmetrical matrices and cosine measure, is used to identify thematic clusters. Results show that the Nordic network is a cohesive network, set up by three well-defined sub-networks and it rests on the Finnish and Swedish sub-networks. We conclude that the Danish network has less visibility than other Nordic countries. The Swedish one is the principal Nordic sub-network and the Finland network is a slightly isolated from Europe, with the exception of the University of Helsinki.
Air Quality Monitoring with SensorMap
Authors: Péter Völgyesi, András Nádas, Xenofon Koutsoukos, Ákos Lédeczi
Venue: Proceedings of the 7th international conference on Information processing in sensor networks (2008)

The Mobile Air Quality Monitoring Network (MAQUMON) is presented. The system consists of a number of car-mounted sensor nodes measuring different pollutants in the air. The data points are tagged with location and time utilizing an on-board GPS. Periodically, the measurements are uploaded to a server, processed and then published on the SensorMap portal. Given a sufficient number of nodes and diverse mobility patterns, a detailed picture of the air quality in a large area will be obtained at a low cost.
2008 Special Issue: Central pattern generators for locomotion control in animals and robots: A review
Authors: Auke Jan Ijspeert
Venue: Neural Networks (2008)

The problem of controlling locomotion is an area in which neuroscience and robotics can fruitfully interact. In this article, I will review research carried out on locomotor central pattern generators (CPGs), i.e. neural circuits capable of producing coordinated patterns of high-dimensional rhythmic output signals while receiving only simple, low-dimensional, input signals. The review will first cover neurobiological observations concerning locomotor CPGs and their numerical modelling, with a special focus on vertebrates. It will then cover how CPG models implemented as neural networks or systems of coupled oscillators can be used in robotics for controlling the locomotion of articulated robots. The review also presents how robots can be used as scientific tools to obtain a better understanding of the functioning of biological CPGs. Finally, various methods for designing CPGs to control specific modes of locomotion will be briefly reviewed. In this process, I will discuss different types of CPG models, the pros and cons of using CPGs with robots, and the pros and cons of using robots as scientific tools. Open research topics both in biology and in robotics will also be discussed.
A Methodology for Performance Modeling of Distributed Event-Based Systems
Authors: Samuel Kounev, Kai Sachs, Jean Bacon, Alejandro Buchmann
Venue: Proceedings of the 2008 11th IEEE Symposium on Object Oriented Real-Time Distributed Computing (2008)

Distributed event-based systems (DEBS) are gaining increasing attention in new application areas such as transport information monitoring, event-driven supply-chain management and ubiquitous sensor-rich environments. However, as DEBS increasingly enter the enterprise and commercial domains, performance and quality of service issues are becoming a major concern. While numerous approaches to performance modeling and evaluation of conventional request/reply-based distributed systems are available in the literature, no general approach exists for DEBS. This paper is the first to provide a comprehensive methodology for workload characterization and performance modeling of DEBS. A workload model of a generic DEBS is developed and operational analysis techniques are used to characterize the system traffic and derive an approximation for the mean event delivery latency. Following this, a modeling technique is presented that can be used for accurate performance prediction. The paper is concluded with a case study of a real life system demonstrating the effectiveness and practicality of the proposed approach.
On the link between SAR-derived sea ice melt and development of the summer upper ocean mixed layer in the North Open Water Polynya
Authors: R. J. Galley, D. G. Barber, J. J. Yackel
Venue: International Journal of Remote Sensing (2007)

We examine the ability of SAR-derived landfast sea ice thermodynamic state surrounding the North Water Polynya to predict the timing of a shallow, stably stratified summer ocean mixed layer in the region. Radarsat-1 ScanSAR is used to derive melt and pond onset dates over landfast sea ice surrounding the polynya, describing its thermodynamic evolution. Salinity and temperature profiles, connected in time and space, are complemented by potential density profiles and mixed layer depths, which describe the evolution of the upper ocean mixed layer between 4 April and 21 July 1998. Surface salinity driven potential density stratification and summer mixed layer depths are temporally coincident. Sea ice-ocean connection is first described at the local scale, then regionally. At the local scale, a reduction in surface salinity occurs between the melt and pond onsets over landfast sea ice. At the polynya scale, interpolated pond onset date is highly effective at predicting the timing of a thin, stably stratified summer ocean mixed layer; this has consequences for the potential prediction of timing of maximum ecosystem productivity.
Modeling directionality in wireless networks: extended abstract
Authors: Eric W. Anderson, Caleb T. Phillips, Kevin S. Bauer, Dirk C. Grunwald, Douglas C. Sicker
Venue: ACM SIGMETRICS Performance Evaluation Review (2008)

The physical-layer models commonly used in current networking research only minimally address the interaction of directional antennas and radio propagation. This paper compares the models found in popular simulation tools with measurements taken across a variety of links in multiple environments. We find that the effects of antenna direction are significantly different from the models used by the common wireless network simulators. We propose a parametric model which better captures the effects of different propagation environments on directional antenna systems. We believe that adopting this model will allow more realistic simulation of protocols relying on directional antennas, supporting better design and more valid assessment of those protocols.
Perceived Value and Usage Patterns of Mobile Data Services: A Cross-Cultural Study
Authors: Maria Bina, George M. Giaglis
Venue: Electronic Markets (2007)

Mobile Data Services (MDS) encompass all non-voice value-adding services accessible through mobile networks that are designated to augment end-user experience with mobility and enrich mobile business models. The diffusion path of MDS varies considerably across countries and consumer segments with the Asia Pacific region leading the way and Europe and the Americas lagging behind. In view of this divergence in MDS adoption patterns, our study focuses on two countries, Greece and South Korea, considered representative of the aforementioned dipole, and seeks to cross-compare user perceptions, usage levels and experiences with MDS. In doing so, the study draws upon a framework summarizing the key factors influencing MDS adoption and highlights the need to delve into more depth on the consumer side. Key findings from the empirical research in both countries (N = 1,935) show similar, however not identical, MDS categorizations which, in turn, generate three user clusters, namely heavy users, light users and trend followers. Within-country and cross-country comparisons pinpoint that heavy users, as well as Greek MDS adopters, are more disposed to business-oriented usages of mobile data services. Thus, cultural-driven user idiosyncrasies and socio-economic contextual factors emerge as further research directions for understanding the non-unitary evolution path of MDS around the globe.
Using nearest covering codes to embed secret information in grayscale images
Authors: Chin-Chen Chang, The Duc Kieu, Yung-Chen Chou
Venue: Proceedings of the 2nd international conference on Ubiquitous information management and communication (2008)

A good visual quality of stego images is an important property of information hiding systems. This can be achieved by reducing the number of steganographic modifications during the secret data embedding phase. For concerning applications of mobile devices, a simple data embedding method with low power consuming can be used to embed secret data. In this paper, we propose a novel information hiding method to embed a secret message into a grayscale cover image. A segment of three secret bits is embedded into a group of seven cover pixels by replacing the LSBs of pixels in the group with a suitable covering code. The proposed method applies XOR operations to find a suitable bit pattern for data embedding and significantly reduces the cost of the chips requirement for mobile devices. The experimental results show that the proposed method achieves a good visual quality of stego images.
A non-fluorine mold release agent for Ni stamp in nanoimprint process
Authors: Tien-Li Chang, Jung-Chang Wang, Chun-Chi Chen, Ya-Wei Lee, Ta-Hsin Chou
Venue: Microelectronic Engineering (2008)

This study presents a novel material as an anti-adhesive layer between Ni mold stamps and polymethyl methacrylate (PMMA) substrate in nanoimprint process. A polybenzoxazine ((6,6'-bis(2,3-dihydro-3-methyl-4H-1,3-benzoxazinyl))) molecule self-assembled monolayer (PBO-SAM) considering as anti-adhesive coating agent demonstrates that non-fluorine-containing compounds can be improve the nanoimprint process in Ni/PMMA substrates. In this work, the nanostructure-based Ni stamps and the imprinted PMMA mold are performed by electron-beam lithograph (EBL) and our homemade nanoimprint equipment, respectively. To control the forming of fabricated nanopatterns, the simulation can be analyzed their effect of temperature distributions on the deformation of PBO-SAM/PMMA substrate during hot embossing lithography (HEL) process. Herein the diameter of pillar patterns is 200nm with and 400nm pitch on Ni stamp surface. Based on the hydrophobic PBO-SAM surface in this conforming condition, the results of Ni mold stamps infer over 90% improvement in controlling quality and quantity.
A symbolic approach to polyhedral scene analysis by parametric calotte propagation*
Authors: Hongbo Li, Lina Zhao, Ying Chen
Venue: Robotica (2008)

Polyhedral scene analysis studies whether a 2D line drawing of a 3D polyhedron is realizable in space, and if so, it gives the results of parameterizing the space of all possible realizations. For generic 2D data, symbolic computation with Grassmann–Cayley algebra is needed in the analysis. In this paper, we propose a method called parametric calotte propagation to solve the realization and parameterization problems for general polyhedral scenes at the same time. In algebraic manipulation, parametric propagation is more efficient than elimination. In applications, it can lead to linear construction sequences for nonspherical polyhedra whose resolvable sequences do not exist.
LUMPY INVESTMENT AND ENDOGENOUS BUSINESS CYCLES IN AN EVOLUTIONARY MULTI-AGENT MODEL
Authors: Giovanni Dosi, Giorgio Fagiolo, Andrea Roventini
Venue: Cybernetics and Systems (2007)

This article presents an evolutionary model of output and investment dynamics yielding endogenous business cycles. The model describes an economy composed of firms and consumers/workers. Firms belong to two industries. The first one performs R&D and produces heterogenous machine tools. Firms in the second industry invest in new machines and produce a homogenous consumption. Consumers sell their labor and fully consume their income. In line with the empirical literature on investment patterns, we assume that firms' investment decisions are lumpy and constrained by their financial structure. Simulation results show that the model is able to deliver self-sustaining patterns of growth characterized by the presence of endogenous business cycles. The model can also replicate the most important stylized facts concerning micro-and macro-economic dynamics.
Opening the design space: the soft set of requirements
Authors: Alessia Rullo
Venue: Proceedings of the 7th ACM conference on Designing interactive systems (2008)

This paper provides a methodological perspective regarding the design of ambient computing systems informed by the notion of Aesthetics of Interaction. This approach stemmed from the growing complexity that is offered by interaction when computation is distributed in the environment and embodied in all sorts of objects. In this work the notion of Aesthetics of Interaction in ambient computing systems is challenged by the use of the Soft Requirements as tools that complement the existing design methodologies based on participatory design approaches. The perspective presented is based on the work conducted in the Neonatal Intensive Care Unit at Siena Hospital - Italy as a part of the EU PalCom project. The outcomes provide a heuristic account, which informs the design process by fostering the novel complexity of ambient/palpable technologies in delicate and fragile settings.
On the Distribution of Software Faults
Authors: Hongyu Zhang
Venue: IEEE Transactions on Software Engineering (2008)

The Pareto principle is often used to describe how faults in large software systems are distributed over modules. A recent paper by Andersson and Runeson again confirmed the Pareto principle of fault distribution. In this paper, we show that the distribution of software faults can be more precisely described as the Weibull distribution.