ppxscal/embedding_network huggingface dataset:
High-capacity reversible data hiding in binary images using pattern substitution
Authors: Yu-An Ho, Yung-Kuan Chan, Hsien-Chu Wu, Yen-Ping Chu
Venue: Computer Standards Interfaces (2009)

Data hiding, as the term itself suggests, means the hiding of secret data in a cover image. The result is a so-called stego-image. Reversible data hiding is technique, where not only the secret data can be extracted from the stego-image, but the cover image can be completely rebuilt after the extraction of secret data. Therefore, reversible data hiding is the choice in cases of secret data hiding, where the recovery of the cover image is required. In this paper, we propose a high-capacity reversible data hiding scheme based on pattern substitution. Our scheme gathers statistical data concerning the occurrence frequencies of various patterns and quantifies the occurrence frequency as it differs from pattern to pattern. In this way, some pattern exchange relationships can be established, and pattern substitution can thus be used for data hiding. In the extraction stage, we reverse these patterns to their original forms and rebuild an undistorted cover image. Our experimental results demonstrate the practicability of the proposed method. In fact, our new scheme gives a better performance than pair-wise logical computation (PWLC) in terms of both hiding capacity and stego-image visual quality.
Fuzzy prediction architecture using recurrent neural networks
Authors: Daniel Graves, Witold Pedrycz
Venue: Neurocomputing (2009)

A fuzzy inference system (FIS) architecture based on the Takagi-Sugeno-Kang (TSK) fuzzy model is developed for time series prediction. Our objective is to investigate and evaluate the proposed rule-based model against commonly used time series models including ''standard'' architectures such as autoregressive (AR) models and selected topologies of neural networks. The main architectural developments of the FIS involve fuzzy relational antecedents (viz., antecedents represented in the form of fuzzy relations) and recurrent neural networks forming the consequents of the rules. Fuzzy C-means (FCM) clustering is applied to the time series to determine the fuzzy relations for the antecedents of the rules. Experimental results are reported for single-time step prediction and multiple time step (p-step) prediction on several widely used time series.
Technical Section: About the frequencies of some patterns in digital planes. Application to area estimators
Authors: Alain Daurat, Mohamed Tajine, Mahdi Zouaoui
Venue: Computers and Graphics (2009)

In this paper, we prove that the function giving the frequency of a class of patterns of digital planes with respect to the slopes of the plane is continuous and piecewise affine, moreover the regions of affinity are specified. It allows to prove some combinatorial properties of a class of patterns called (m,n)-cubes. This study has also some consequences on local estimators of area: we prove that the local estimators restricted to regions of plane never converge to the exact area when the resolution tends to zero for almost all slopes of plane. All the results are generalized for the regions of hyperplanes in any dimension d>=3.
Synthesis and optical characterization of Ag0 nanoparticles
Authors: M. Torres-Cisneros, C. Velásquez-Ordónez, J. Sánchez-Mondragón, A. Campero, O. G. Ibarra-Manzano, D. A. May-Arrioja, H. Plascencia-Mora, A. Espinoza-Calderón, I. Sukhoivanov
Venue: Microelectronics Journal (2009)

The results of chemical synthesis and optical behavior of silver nanoparticles with sizes ranging from 2-10nm which were obtained by reduction of Ag+ are reported. The material morphology was examined by transmission electron microscopy (TEM) and physical properties were studied by photoluminescence in the range of 400-550nm using two different excitation wavelengths (320 and 380nm). The signature provided by the silver plasmon is readily noticed in the silver nanoparticles. The nonlinear optical properties were obtained using a Z-scan setup and agree with previous results obtained by other methods and preparation of samples. In particular, a positive nonlinear refractive index of 5.0115x10-10m2/W was obtained for a broad sample of silver nanoparticles between 2 and 10nm. The agreement between the properties of the thin film sample and the nanoparticles give emphasis to the Z-scan technique for nonlinearity measurements of much more complex metal-dielectric structures.
A 17ps time-to-digital converter implemented in 65nm FPGA technology
Authors: Claudio Favi, Edoardo Charbon
Venue: Proceeding of the ACM/SIGDA international symposium on Field programmable gate arrays (2009)

This paper presents a new architecture for time-to-digital conversion enabling a time resolution of 17ps over a range of 50ns with a conversion rate of 20MS/s. The proposed architecture, implemented in a 65nm FPGA system, consists of a pipelined interpolating time-to-digital converter (TDC). The TDC comprises a coarse time discriminator and a fine delay line, capable of sustained operation at a clock frequency of 300MHz. A Turbo version of the circuit implements a pipelined interpolating TDC with suppressed dead time to reach a conversion rate of 300MS/s at the expense of a systematic asymmetry that requires fast error correction. The TDCs proposed in this paper can be compensated for process, voltage, and temperature (PVT) variations using a conventional charge pump based feedback or a digital calibration technique. Results demonstrate the suitability of the approach for a variety of applications involving high-precision ultra-fast time discrimination, such as optical lifetime sensing, time-of-flight cameras, high throughput comlinks, RADARs, etc.
Security and privacy of data flows
Authors: Rein Turn
Venue: Proceedings of the May 19-22, 1980, national computer conference (1980)

The development of transnational computer-communication systems and the associated flows of computer data across international borders have created a number of issues and problems: privacy and security of personal data, non-tariff restrictions, concerns over potential erosion of national sovereignty, protectionism, and so forth. These developments are important to the data processing community in the United States since restrictions may be placed on the systems it develops and the data processing services it offers internationally. This session will address the issues involved in general, then concentrate on privacy protection problems, and finally explore a specific, new problem area---privacy rights of business, industry and other organizations regarding data about themselves. 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
Integrating simulation and optimization research into a graduate supply chain modeling course
Authors: Ricki G. Ingalls, Mario Cornejo, Chinnatat Methapatara, Peerapol Sittivijan
Venue: Proceedings of the 40th Conference on Winter Simulation (2008)

This paper addresses the on-going work of integrating supply chain research into the graduate curriculum in the form of a Supply Chain Modeling course. This course integrates research from Oklahoma State University, the University of Arkansas, and the University of Pittsburgh. In this course, the students and the professor develop and implement supply chain models and tools that combine linear optimization and simulation. This paper focuses on the simulation development in the course.
Micromedicine to the rescue
Authors: Don Monroe
Venue: Communications of the ACM (2009)

Medical researchers have long dreamed of "magic bullets" that go directly where they are needed. With micromedicine, this dream could become a life-saving reality.
Student and Faculty Perceptions of Undergraduate Research Experiences in Computing
Authors: L. Barker
Venue: ACM Transactions on Computing Education (TOCE) (2009)

Undergraduate research experiences are promoted and funded for their potential in increasing students&rsquo; likelihood of pursuing graduate degrees, increasing their confidence, and expanding their awareness of their discipline and career opportunities. These outcomes, however, depend on the social, organizational, and intellectual conditions under which students conduct research. Large-scale comparative studies suggest that computer science undergraduate researchers participate in fewer of the activities that lead to membership in a &ldquo;culture of research.&rdquo; This interview-based study illuminates the experiences of both undergraduates and their faculty research mentors in computer science summer and academic year programs. Twenty-five undergraduates and 31 faculty mentors, the majority women, were interviewed. Their stories reveal best and worst case research conditions for students, the special benefits to women who have experienced harassment in their classes, unconscious biases of faculty, the wisdom of faculty who guide undergraduates to successful research outcomes, and faculty&rsquo;s perceptions of benefits for themselves, their departments, and the students they mentor.
DVS: a System for Distribution and Management of Global Video on Demand Services
Authors: Alexey Roytman, Israel Ben-Shaul, Israel Cidon
Venue: Proceedings of the 1999 IEEE International Conference on Multimedia Computing and Systems - Volume 02 (1999)

The Distributed Video Service (DVS) system provides a comprehensive solution for the management and distribution of global Video on Demand. DVS presents a scalable architecture that combines the global accessibility of the Internet with an acceptable quality of service through an optional private high-speed backbone, and by distributing movies off-line to servers that are closer to potential viewers. To cope with dynamic changes in movie demand and server load, DVS employs adaptive algorithms for server selection and for movie distribution. DVS was implemented in Java, integrated with a front-end playing software, and supports IP and ATM as the public and private networks, respectively.
On User Preferences and Utility Functions in Selection: A Semantic Approach
Authors: José María García, David Ruiz, Antonio Ruiz-Cortés
Venue: Service-Oriented Computing - ICSOC 2007 Workshops: ICSOC 2007, International Workshops, Vienna, Austria, September 17, 2007, Revised Selected Papers (2009)

Discovery tasks in the context of Semantic Web Services are generally performed using Description Logics. However, this formalism is not suited when non-functional, numerical parameters are involved in the discovery process. Furthermore, in selection tasks, where an optimization algorithm is needed, DLs are not capable of computing the optimum. Although there are DLs extensions that can handle numerical parameters, they bring decidability problems. Other solutions, as hybrid approaches which use DLs in functional discovery and other formalisms in non-functional selection, do not provide a semantic framework to describe user preferences based on non-functional properties. In this work, we propose to semantically describe user preferences, so they can be used to perform selection within a hybrid solution. By using semantically described utility functions in order to define user preferences, our proposal enables interoperability between service offers and demands, while providing a high level of expressiveness in these preferences and including them within SWS descriptions.
The SantaBot experiment: a pilot study of human-robot interaction
Authors: Søren Tranberg Hansen, Mikael Svenstrup, Hans Jørgen Andersen, Thomas Bak, Ole B. Jensen
Venue: Proceedings of the 4th ACM/IEEE international conference on Human robot interaction (2009)

The video shows how an autonomous mobile robot dressed as Santa Claus is interacting with people in a shopping mall. The underlying hypothesis is that it is possible to create interesting new living spaces and induce value in terms of experiences, information or economics, by putting socially interactive mobile agents into public urban transit area. To investigate the hypothesis, an experiment was carried out using a robot capable of navigating autonomously based on the input of an onboard laser scanner. The robot would detect and follow random people, who afterwards were asked to fill out a questionnaire for quantitative analysis of the experiment. The presented video is the corresponding video documentation of the experiment used in the evaluation. The results showed that people were generally positive towards having mobile robots in this type of environment where shopping is combined with transit. However, it also showed harder than expected to start interaction with commuters due to their determination and speed towards their goal. Further it was demonstrated that it was possible to track and follow people, who were not beforehand informed on the experiment. The evaluation indicated, that the distance to initiate interaction was shorter than initially expected, but complies with the distance for normal human to human interaction.
A Mobile-Based Face Verification System
Authors: Zongying Ou, Tieming Su, Fan Ou, Jianxin Zhang, Dianting Liu
Venue: International Journal of Distributed Sensor Networks (2009)

Intelligent mobile phones equipped with a camera are very popular in our daily lives now. Face verification running on mobile phone provides not only a tool for the protection of the owner's authority but also an approach for verification from a distance. The combination of biometrics and telecommunication technologies possesses broad application potentials in information exchanges. However, there are also some critical issues needing solving. Usually the processing power and memory size of a mobile phone system are limited, and the acquisition images are suffered from the illumination changes. An acquisition image I(x,y) can be modeled as a product of the reflectance R and Illuminant effect L shown as I(x,y) = R(x,y)*L(x,y). The reflectance attribution R(x,y) is the inherent feature of a human face for verification. Compared with the reflectance changes rapidly across the contour of a face, usually the illumination changes smoothly and slowly. If two pixels are located nearby, the ratio of the reflectance between these two pixels can be calculated via the ratio of their illuminations, which is approximately independent from illumination changes. Based on this invariant property of the ratio of illumination at a pixel to its surrounding neighbor illuminations, an illumination normalization technique was developed and adapted to the mobile system. A dedicated scheme composed of special wavelets called Gab features was proposed for representation of human faces. Gabor features reveal more structure information of images; however, the data dimensionality is becoming very high. An optimization processing was designed for searching the optimal Gabor node configuration and reducing the number of Gabor nodes effectively. To fit the limitation of the phone processor, all the floating point calculations were implemented with integer calculations, the feature extraction and discriminating verification algorithms were carefully designed to accelerate implementation and control the heap and stack sizes. A mobile based face verification system was developed and embedded in the Lenovo ET980 mobile phone, which is equipped with CPU Intel XScale PX270, memory 128MB Flash/64 MB SDRAM, and a 4 million pixel camera. The experiments testing on FERET fafb dataset show that the system Equal False Accept Rate and False Reject Rate achieved 1.51%; and the False Accept Rates achieved 2.12% and 6.81%, while the False Reject Rate at 1% and 0.1% respectively. The processing time is about 1 second. The performance of this system is quite well.
Design as integration of axiomatic design and design structure matrix
Authors: Dunbing Tang, Guangjun Zhang, Sheng Dai
Venue: Robotics and Computer-Integrated Manufacturing (2009)

Axiomatic design and design structure matrix (DSM) are two popular design methods at the moment, while most related researches only apply the basic ideas of axiomatic design or DSM to some use cases. This paper analyses the disadvantages of both axiomatic design and DSM. The axiomatic design method guides the designer finding suitable design parameters to meet the needs of function requirements. But axiomatic design cannot support the designer to know the interactions amongst the design parameters, including geometry, spatial layout, interfaces (e.g. logical and physical connectivity), which will decide the quality of the design. DSM has the advantages at recording and analysing the interaction relationship between existing product elements. However, at the conceptual design stage or for a new product that has never been designed before, it is difficult to make the DSM. After deep investigations, it has been found that there are strong complementarities between axiomatic design and DSM, and integration of both sides is advocated for better-quality design. The main outcome of this work is the formal interpretation of the integration logic between axiomatic design and DSM. Under such integration context, the conceptual design process can be seen as a recursive interaction of axiomatic design's design matrix (DM) and corresponding DSM. In this way, axiomatic design and DSM can benefit from each other. A computer-aided conceptual design system has been developed to realize the proposed integration model of axiomatic design and DSM.
Evaluating hydrology preservation of simplified terrain representations
Authors: Christopher Stuetzle, W. Randolph Franklin, Barbara Cutler
Venue: SIGSPATIAL Special (2009)

We present an error metric based on the potential energy of water flow to evaluate the quality of lossy terrain simplification algorithms. Typically, terrain compression algorithms seek to minimize RMS (root mean square) and maximum error. These metrics fail to capture whether a reconstructed terrain preserves the drainage network. A quantitative measurement of how accurately a drainage network captures the hydrology is important for determining the effectiveness of a terrain simplification technique. Having a measurement for testing and comparing different models has the potential to be widely used in numerous applications (flood prevention, erosion measurement, pollutant propagation, etc). In this paper, we transfer the drainage network computed on reconstructed geometry onto the original uncompressed terrain and use our error metric to measure the level of error created by the simplification. We also present a novel terrain simplification algorithm based on the compression of hydrology features. This method and other terrain compression schemes are then compared using our new metric.
Educational environment on StarBED: case study of SOI Asia 2008 Spring Global E-Workshop
Authors: Toshiyuki Miyachi, Achmad Basuki, Shoko Mikawa, Shinsuke Miwa, Ken-ichi Chinen, Yoichi Shinoda
Venue: Proceedings of the 4th Asian Conference on Internet Engineering (2008)

Hands-on experiences are indispensable to train IT operators. However, it is often difficult to conduct hands-on practices in many locations due to lack of resources such as PCs and network equipments. The cost of gathering lecturers and participants at one hands-on site is another possible problem in this situation. Utilization of remotely located hands-on environment is one of the solution to solve these problems. StarBED is a testbed facility for conducting network experiments. Installation of any OSes, adjusting the network topologies according to the requirements can be easily realized utilizing StarBED and SpringOS. A software suite, SpringOS, was developed exclusively for automating the experiment setups in StarBED. This facility could be used to address the problems of lack of resources and high cost for traveling. This research conducted a region-wide remote hands-on workshop utilizing the StarBED inviting 42 participants from 10 Asian countries. The workshop was designed so that the remote participants do not have to travel to single place, and prepare same specification PCs at each site. Through the collected data and feedback, the proposed workshop model was proved to be feasible and effective. This paper describes the requirements and approaches for region-wide remote hands-on workshop utilizing StarBED for building target hands-on environment. As the contents of the conducted workshop could be applied to the general IT human resource development programs, this paper could be useful for the future remote hands-on programs to train IT operators.
Tralfamadore: unifying source code and execution experience
Authors: Geoffrey Lefebvre, Brendan Cully, Michael J. Feeley, Norman C. Hutchinson, Andrew Warfield
Venue: Proceedings of the 4th ACM European conference on Computer systems (2009)

Program source is an intermediate representation of software; it lies between a developer's intention and the hardware's execution. Despite advances in languages and development tools, source itself and the applications we use to view it remain an essentially static representation of software, from which developers can spend considerable energy postulating actual behavior. Emerging techniques in execution logging promise to provide large shared repositories containing high-fidelity recordings of deployed, production software. Tralfamadore is a system that combines source and execution trace analysis to capitalize on these recordings, and to expose information from the "experience" of real execution within the software development environment, allowing developers to inform their understanding of source based on how it behaves during real execution.
Appropriation Infrastructure: Supporting the Design of Usages
Authors: Gunnar Stevens, Volkmar Pipek, Volker Wulf
Venue: Proceedings of the 2nd International Symposium on End-User Development (2009)

End User Development offers technical flexibility to encourage the appropriation of software applications within specific contexts of use. Appropriation needs to be understood as a phenomenon of many collaborative and creative activities. To support appropriation, we propose integrating communication channels into software applications. Such an appropriation infrastructure provides communication and collaboration support to stimulate knowledge sharing among users and between users and developers. It exploits the technological flexibility of software applications to enable these actors to change usages and configurations. Taking the case of the BSCWeasel groupware, we demonstrate how an appropriation infrastructure can be realized. Empirical results from the BSCWeasel project demonstrate the impact of such an infrastructure on the appropriation and design process. Based on these results, we argue that appropriation infrastructures should be tightly integrated in the application using the IT artifact itself as a boundary object as well as a bridge between design and use.
Tunable Parallel Experiments in a GridRPC Framework: Application to Linear Solvers
Authors: Yves Caniou, Jean-Sébastien Gay, Pierre Ramet
Venue: High Performance Computing for Computational Science - VECPAR 2008: 8th International Conference, Toulouse, France, June 24-27, 2008. Revised Selected Papers (2008)

The use of scientific computing centers becomes more and more difficult on modern parallel architectures. Users must face a large variety of batch systems (with their own specific syntax) and have to set many parameters to tune their applications (e.g., processors and/or threads mapping, memory resource constraints). Moreover, finding the optimal performance is not the only criteria when a pool of jobs is submitted on the Grid (for numerical parametric analysis for instance) and one must focus on the wall-time completion. In this work we tackle the problem by using the Diet Grid middleware that integrates an adaptable PaStiX service to solve a set of experiments issued from the simulations of the Aster project.