ppxscal/embedding_network huggingface dataset:
A Geometric Framework and a New Criterion in Optical Flow Modeling
Authors: Rami Ben-Ari, Nir Sochen
Venue: Journal of Mathematical Imaging and Vision (2009)

We evaluate the dense optical flow between two frames via variational approach. In this paper, a new framework for deriving the regularization term is introduced giving a geometric insight into the action of a smoothing term. The framework is based on the Beltrami paradigm in image denoising. It includes a general formulation that unifies several previous methods. Using the proposed framework we also derive two novel anisotropic regularizers incorporating a new criterion that requires co-linearity between the gradients of optical flow components and possibly the intensity gradient. We call this criterion "alignment" and reveal its existence also in the celebrated Nagel and Enkelmann's formulation. It is shown that the physical model of rotational motion of a rigid body, pure divergent/convergent flow and irrotational fluid flow, satisfy the alignment criterion in the flow field. Experimental tests in comparison to a recently published method show the capability of the new criterion in improving the optical flow estimations.
A microprocessor implementation of a dedicated store-and-forward data communications system
Authors: P. M. Russo, M. D. Lippman
Venue: Proceedings of the May 6-10, 1974, national computer conference and exposition (1974)

The stored-program approach to data communications system design is not new. The past several years have witnessed a large and ever-increasing number of minicomputers and larger processors dedicated to the implementation of a variety of data communications functions. To date, however, the use of computers has been relegated primarily to medium-sized and larger systems where highly complex data communications requirements justify reasonably large investments in hardware and software. In many low-end applications, however, the high cost of minicomputers and their associated peripherals cannot be justified. This is especially true in a dedicated system where two terminals (or groups of terminals) communicate over a dedicated communications channel.
Conception de syst&egrave;mes collaboratifs multimodaux: analyse comparative de notations
Authors: Frédéric Jourde, Yann Laurillau, Laurence Nigay, Alberto Moran
Venue: Proceedings of the 20th International Conference of the Association Francophone d'Interaction Homme-Machine (2008)

Interactive systems including multiple interaction devices and surfaces for supporting the collaboration of a group of co-located users are increasingly common in real applications. These include collaborative and multimodal military command posts, the latter of which is one of our application domains. Nevertheless few collaborative and multimodal interface specification notations are proposed. As a first step towards a notation for specifying a design solution prior to its software design and development, we adopt an empirical approach. In this paper we apply and compare four existing notations for collaborative systems by considering a case study, namely, a system for supporting informal co-located collaboration in hospital work. Since the selected notations differ in their descriptive qualities, with some focusing on collaborative tasks while others focus on the users' roles and on collaborative situations, our goal is not to empirically evaluate the notations. Our goal is rather to assess their complementary aspects and their projected ability to specify a multimodal collaborative user interface.
Interaction designers' use of their repertoire in meetings with clients
Authors: Per Sökjer
Venue: Proceedings of the 21st British HCI Group Annual Conference on HCI 2008: People and Computers XXI: HCI...but not as we know it - Volume 2 (2007)

An important part of an interaction designer's work is meeting with clients during design sessions. It is of great importance that the designers participate in establishing some level of common ground. This research aims at investigating how designer's repertoire, in terms of facts, skills and examples, can help establishing common ground between designers and their clients. The research method is inspired by cognitive ethnography. Initial results from workshops, where interaction designers work together with participants from the Swedish Enforcement Authority, indicate that the interaction designers use examples from several design levels to establish common ground with clients and each other. Our future research aims to show how interaction designer and client work together in multidisciplinary teams.
Process Mining towards Semantics
Authors: A. K. Alves De Medeiros, W. M. Aalst
Venue: Advances in Web Semantics I: Ontologies, Web Services and Applied Semantic Web (2008)

Process mining techniques target the automatic discovery of information about process models in organizations. The discovery is based on the execution data registered in event logs. Current techniques support a variety of practical analysis, but they are somewhat limited because the labels in the log are not linked to any concepts. Thus, in this chapter we show how the analysis provided by current techniques can be improved by including semantic data in event logs. Our explanation is divided into two main parts. The first part illustrates the power of current process mining techniques by showing how to use the open source process mining tool ProM to answer concrete questions that managers typically have about business processes. The second part utilizes usage scenarios to motivate how process mining techniques could benefit from semantic annotated event logs and defines a concrete semantic log format for ProM. The ProM tool is available at www.processmining.org.
A Novel Remote User Authentication Scheme Using Smart Card Based on ECDLP
Authors: Debasish Jena, Sanjay Kumar Jena, Debashisa Mohanty, Saroj Kumar Panigrahy
Venue: Proceedings of the 2009 International Conference on Advanced Computer Control (2009)

In this paper, a novel efficient remote user authentication scheme using smart cards based on Elliptic Curve Discrete Logarithm Problem (ECDLP) has been proposed. A remote user authentication scheme is a two-party protocol whereby an authentication server confirms the identity of a remote individual logging on to the server over an untrusted, unsecured network. The password based authentication schemes are commonly used for authenticating remote users. Many passwords based schemes both with and without smart card have been proposed; each scheme has its merits and demerits. Our proposed scheme does not require verifier table and allows the user to choose their passwords. The proposed scheme also withstands message replying attack.
Software engineering education
Authors: Barry Boehm
Venue: Proceedings of the May 19-22, 1980, national computer conference (1980)

Several studies have indicated that the data processing industry's most critical problem during the 1980's will be a shortage of qualified software engineers. This panel brings together a number of people who have been actively addressing the problem of increasing the supply of qualified software engineers through both University and industry programs in software engineering education. They will address the following issues: &bull; What skills will be needed by the software engineer of the future? &bull; What software engineering programs are currently underway in universities, industry, and professional societies to meet these needs? &bull; What particular approaches have been tried to date, and how well have they worked out? &bull; What are some resulting guidelines for mounting a successful software engineering education program? 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
Efficient Vessel Tracking with Accuracy Guarantees
Authors: Martin Redoutey, Eric Scotti, Christian Jensen, Cyril Ray, Christophe Claramunt
Venue: Proceedings of the 8th International Symposium on Web and Wireless Geographical Information Systems (2008)

Safety and security are top concerns in maritime navigation, particularly as maritime traffic continues to grow and as crew sizes are reduced. The Automatic Identification System (AIS) plays a key role in regard to these concerns. This system, whose objective is in part to identify and locate vessels, transmits location-related information from vessels to ground stations that are part of a so-called Vessel Traffic Service (VTS), thus enabling these to track the movements of the vessels. This paper presents techniques that improve the existing AIS by offering better and guaranteed tracking accuracies at lower communication costs. The techniques employ movement predictions that are shared between vessels and the VTS. Empirical studies with a prototype implementation and real vessel data demonstrate that the techniques are capable of significantly improving the AIS.
Characterization of unlabeled level planar trees
Authors: Alejandro Estrella-Balderrama, J. Joseph Fowler, Stephen G. Kobourov
Venue: Computational Geometry: Theory and Applications (2009)

Consider a graph G with vertex set V in which each of the n vertices is assigned a number from the set {1,...,k} for some positive integer k. This assignment @f is a labeling if all k numbers are used. If @f does not assign adjacent vertices the same label, then @f forms a leveling that partitions V into k levels. If G has a planar drawing in which the y-coordinate of all vertices match their labels and edges are drawn strictly y-monotone, then G is level planar. In this paper, we consider the class of level trees that are level planar regardless of their labeling. We call such trees unlabeled level planar (ULP). Our contributions are three-fold. First, we describe which trees are ULP and provide linear-time level planar drawing algorithms for any labeling. Second, we characterize ULP trees in terms of forbidden subtrees so that any other tree must contain a subtree homeomorphic to one of these. Third, we provide a linear-time recognition algorithm for ULP trees.
Cost-Sensitive Parsimonious Linear Regression
Authors: Robby Goetschalckx, Kurt Driessens, Scott Sanner
Venue: Proceedings of the 2008 Eighth IEEE International Conference on Data Mining (2008)

We examine linear regression problems where some features may only be observable at a cost (e.g., in medical domains where features may correspond to diagnostic tests that take time and costs money). This can be important in the context of data mining, in order to obtain the best predictions from the data on a limited cost budget. We define a parsimonious linear regression objective criterion that jointly minimizes prediction error and feature cost. We modify least angle regression algorithms commonly used for sparse linear regression to produce the ParLiR algorithm, whichnot only provides an efficient and parsimonious solution as we demonstrate empirically, but it also provides formal guarantees that we prove theoretically.
Plenary lecture II: fundamentals of fuzzy preference modeling
Authors: Imre J. Rudas
Venue: Proceedings of the 8th conference on Applied informatics and communications (2008)

In this lecture we give a survey of some classical as well as most recent models of preferences based on pairwise comparison of alternatives. The underlying framework is fuzzy logic in which preferences can be expressed in a gradual way. Fuzzy preference structures, as a generalization of Boolean (2-valued) preference structures, are studied. A fuzzy preference structure is a triplet of fuzzy relations expressing strict preference, indifference and incomparability in terms of truth degrees. An important issue is the decomposition of a fuzzy preference relation into such a structure. An appropriate approach requires some effort and axiomatic consideration, because the straightforward formalism of the Boolean case gives undesirable results. We point out the essential role of the logical connectives behind fuzzy preferences through their axiomatic constructions and characterizations. This requires an extensive introduction to connectives in fuzzy logic as well.
Simulating the operation of feed-forward convolutional encoders and Viterbi decoders applied in additive white Gaussian noise communication channels
Authors: Adriana Borodzhieva, Plamen Manoilov
Venue: Proceedings of the 9th International Conference on Computer Systems and Technologies and Workshop for PhD Students in Computing (2008)

An algorithm for generating random binary data, convolutional encoding the data, passing the encoded data through a noisy channel, quantizing the received channel symbols, and performing Viterbi decoding on the quantized channel symbols to recover the original binary data is implemented in MATLAB using built-in functions in Communications Toolbox. The developed tool will be used in the educational process in the course "Channel coding in telecommunications systems" and it will enable students to comprehend the principles of convolutional encoding and Viterbi decoding.
WaterCooler: exploring an organization through enterprise social media
Authors: Michael J. Brzozowski
Venue: Proceedings of the ACM 2009 international conference on Supporting group work (2009)

As organizations scale up, their collective knowledge increases, and the potential for serendipitous collaboration between members grows dramatically. However, finding people with the right expertise or interests becomes much more difficult. Semi-structured social media, such as blogs, forums, and bookmarking, present a viable platform for collaboration-if enough people participate, and if shared content is easily findable. Within the trusted confines of an organization, users can trade anonymity for a rich identity that carries information about their role, location, and position in its hierarchy. This paper describes WaterCooler, a tool that aggregates shared internal social media and cross-references it with an organization's directory. We deployed WaterCooler in a large global enterprise and present the results of a preliminary user study. Despite the lack of complete social networking affordances, we find that WaterCooler changed users' perceptions of their workplace, made them feel more connected to each other and the company, and redistributed users' attention outside their own business groups.
Using strokes as command shortcuts: cognitive benefits and toolkit support
Authors: Caroline Appert, Shumin Zhai
Venue: Proceedings of the 27th international conference on Human factors in computing systems (2009)

This paper investigates using stroke gestures as shortcuts to menu selection. We first experimentally measured the performance and ease of learning of stroke shortcuts in comparison to keyboard shortcuts when there is no mnemonic link between the shortcut and the command. While both types of shortcuts had the same level of performance with enough practice, stroke shortcuts had substantial cognitive advantages in learning and recall. With the same amount of practice, users could successfully recall more shortcuts and make fewer errors with stroke shortcuts than with keyboard shortcuts. The second half of the paper focuses on UI development support and articulates guidelines for toolkits to implement stroke shortcuts in a wide range of software applications. We illustrate how to apply these guidelines by introducing the Stroke Shortcuts Toolkit (SST) which is a library for adding stroke shortcuts to Java Swing applications with just a few lines of code.
A Novel Approach to Corner Matching Using Fuzzy Similarity Measure
Authors: Ambar Dutta, Avijit Kar, B. N. Chatterji
Venue: Proceedings of the 2009 Seventh International Conference on Advances in Pattern Recognition (2009)

Corner matching in sequence images serves as a building block of several important applications of stereo vision. In this paper, we establish the corner correspondence between two images in the presence of intensity variations and motion blur by using a fuzzy theory based similarity measure. The matching approach proposed by us needs to extract set of corner points as candidates from both the frames. Experiments conducted with the help of various sequences of images prove the superiority of our algorithm over standard cross correlation and sum of absolute difference under non-ideal conditions.
Reliability Analysis of CTCS Based on Two GSM-R Double Layers Networks Structures
Authors: Yuan Cao, Baigen Cai, Tao Tang, Jiancheng Mu
Venue: Proceedings of the 2009 WRI International Conference on Communications and Mobile Computing - Volume 03 (2009)

In CTCS (China Train Control System) level-3 and level-4, GSM-R is the wireless communications system, and it is a platform to transfer security data of train control. As the train control system is safety critical system, once the security data are delayed or lost by GSM-R, an emergency brake will be executed, or even the danger will happen. This paper bases on two different existing GSM-R double layers networks, and establishes the channel and train control system models, then analyzes the relation between the average train number of one cell and the free channel rate and probability of emergency stop. The results show the intercross double layers network can make the CTCS-3 more reliable than co-sited double layers network.
Adaptive Selection and Rearrangement of Wavelet Packets for Quad-Tree Image Coding
Authors: Hsi-Chin Hsin, Tze-Yun Sung
Venue: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (2008)

Embedded zero-tree image coding in wavelet domain has drawn a lot of attention. Among noteworthy algorithms is the set partitioning in hierarchical trees (SPIHT). Typically, most of images' energy is concentrated in low frequency subbands. For an image with textures, however many middle-high frequency wavelet coefficients are likely to become significant in the early passes of SPIHT; thus the coding results are often insufficient. Middle and high frequency subbands of images may demand further decompositions using adaptive basis functions. As wavelet packet transform offers a great diversity of basis functions, we propose a quad-tree based adaptive wavelet packet transform to construct adaptive wavelet packet trees for zero-tree image coding. Experimental results show that coding performances can be significantly improved especially for fingerprints images.
Buffered cross-bar switches, revisited: design steps, proofs and simulations towards optimal rate and minimum buffer memory
Authors: George F. Georgakopoulos
Venue: IEEE/ACM Transactions on Networking (TON) (2008)

Regarding the packet-switching problem, we prove that the weighed max-min fair service rates comprise the unique Nash equilibrium point of a strategic game, specifically a throughput auction based on a "least-demanding first-served" principle. We prove that a buffered crossbar switch can converge to this equilibrium with no pre-computation or internal acceleration, with either randomized or deterministic schedulers, (the latter with a minimum buffering of a single-packet per crosspoint). Finally, we present various simulation results that corroborate and extend our analysis.
Context-Aware Computing and Self-Managing Systems, 1 edition
Authors: Waltenegus Dargie
Venue: Chapman & Hall/Crc Studies In Informatics Series (2009)

Bringing together an extensively researched area with an emerging research issue, Context-Aware Computing and Self-Managing Systems presents the core contributions of context-aware computing in the development of self-managing systems, including devices, applications, middleware, and networks. The expert contributors reveal the usefulness of context-aware computing in developing autonomous systems that have practical application in the real world. The first chapter of the book identifies features that are common to both context-aware computing and autonomous computing. It offers a basic definition of context-awareness, covers fundamental aspects of self-managing systems, and provides several examples of context information and self-managing systems. Subsequent chapters on context-awareness demonstrate how a context can be employed to make systems smart, how a context can be captured and represented, and how dynamic binding of context sources can be possible. The chapters on self-management illustrate the need for implicit knowledge to develop fault-tolerant and self-protective systems. They also present a higher-level vision of future large-scale networks. Through various examples, this book shows how context-aware computing can be used in many self-managing systems. It enables researchers of context-aware computing to identify potential applications in the area of autonomous computing. The text also supports researchers of autonomous computing in defining, modeling, and capturing dynamic aspects of self-managing systems.
An experimental and numerical investigation into the effects of the PZT actuator shape in polymethylmethacrylate (PMMA) peristaltic micropumps
Authors: Yi-Chu Hsu, Jia-Long Hsu, Ngoc Bich Le
Venue: Microsystem Technologies (2009)

Utilizing a solvent-assisted bonding process, two diffuser-type polymethylmethacrylate (PMMA) peristaltic micropumps are fabricated with a linear array of circular microchambers with a depth and diameter of 15&#x00a0;m and 7&#x00a0;mm, respectively, actuated using either square or circular PZT actuators. Experimental trials are performed to characterize the performance of the two micropumps under driving frequencies ranging from 80 to 150 Vpp and actuation frequencies in the range of 10&#x00a0;Hz to 1&#x00a0;kHz. The results reveal that the micropump with square PZT actuators generates a maximum pumping rate and back pressure of 217&#x00a0;l/min and 9.2&#x00a0;kPa, respectively, while the micropump with circular actuators generates a maximum flow rate of 131&#x00a0;l/min and a back pressure of 2.7&#x00a0;kPa. ANSYS finite element simulations demonstrate two events. First, given an equivalent surface area, the circular actuators undergo a greater displacement than the square actuators under given actuation conditions. In other words, the circular actuator design is more efficient to represent a higher ratio of the displacement to the actuation area (d/A). However, the circular actuators with the surface area of 38.47&#x00a0;mm2 are smaller than the square actuators (49&#x00a0;mm2). In addition, it is inferred that the relatively poorer performance of the circular actuators is due in part to thermal damage of the PZT patches during their removal from the bulk PZT chip using a laser cutting device in the pump fabrication process. Secondly, when the shape of the effective working area for the actuation is rectangular which is usual in a MEMS design, the rectangular actuator with length of 7&#x00a0;mm has significantly higher displacement (0.71&#x00a0;m) than that of the circular actuator with diameter of 7&#x00a0;mm (0.396&#x00a0;m). Consequently, a rectangular actuator design presents a more practical solution for higher performance of micro-actuators.