ppxscal/embedding_network huggingface dataset:
Dynamic prediction of communication flow using social context
Authors: Munmun De Choudhury, Hari Sundaram, Ajita John, Dorée Seligmann
Venue: Proceedings of the nineteenth ACM conference on Hypertext and hypermedia (2008)

In this paper, we develop a temporally evolving representation framework for context that can efficiently predict communication flow in social networks between a given pair of individuals. The problem is important because it facilitates determining social and market trends as well as efficient information paths among people. We describe communication flow by two parameters: the intent to communicate and communication delay. To estimate these parameters, we design features to characterize communication and social context. Communication context refers to the attributes of current communication. Social context refers to the patterns of participation in communication (information roles) and the degree of overlap of friends between two people (strength of ties). A subset of optimal features of the communication and social context is chosen at a given time instant using five different feature selection strategies. The features are thereafter used in a Support Vector Regression framework to predict the intent to communicate and the delay between a pair of individuals. We have excellent results on a real world dataset from the most popular social networking site, www.myspace.com. We observe interestingly that while context can reasonably predict intent, delay seems to be more dependent on the personal contextual changes and other latent factors characterizing communication, e.g. 'age' of information transmitted and presence of cliques among people.
Students' attitudes towards integration of ICTs in a reading course: A case in Turkey
Authors: C. S. Sagin Simsek
Venue: Computers Education (2008)

The purpose of this paper is to investigate students' attitudes towards the use of information and communication technologies (ICTs) in a reading skills course offered at Middle East Technical University, Ankara, Turkey. To this end, 30 first year students of the foreign language education (FLE) department followed a four-week component of an ICTs-integrated reading skills course. To examine the students' attitudes towards the course and the new learning environment at the end of the teaching period, an attitude questionnaire was administered and interviews were conducted. The findings indicate that despite the difficulties they faced, the students were satisfied overall with the application of ICTs in their reading course and developed positive attitudes towards online courses.
Estimation of Evapotranspiration with Modified SEBAL Model Using Landsat-TM and NOAA-AVHRR Images in Arid Mountains Area
Authors: Ayoub Ahmed Almhab, Ibrahim Busu
Venue: Proceedings of the 2008 Second Asia International Conference on Modelling & Simulation (AMS) (2008)

This study examines the method for determining surface energy namely surface energy balance algorithm for land (SEBAL). This particular method utilized the combination of meteorological observations with information extracted from remote sensing data. The modified SEBAL model using data from Landsat TM and NOAA- AVHRR sensors, has been used to estimate net radiation, soil heat flux, sensible heat flux and ET for Sana’a Basin in Yemen. The area is known for arid and semi-arid weather condition with undulating topographic. Remote sensing data for year 95, 96 and 1998 were used as a primary image for this study. Actual ET was computed during satellite overpass and integrated for 24-h on pixel-by-pixel basis for daily ET distribution. Due to the topographic effects, an attempt has also been made to incorporated DEM information for estimating the net radiation. As a result, a daily ET map generated from metrological observation was compared with estimated ET data simulated from remote sensing data. In conclusion, data from both remote sensing give reasonable values with result from TM are better compare to those of AVHRR due to difference in spatial resolution, which TM data a higher spatial resolution than AVHRR.
New techniques for designing a finite difference domain decomposition algorithm for the two-and three-dimensional heat equations
Authors: Ting Wang
Venue: International Journal of Computer Mathematics (2007)

New techniques are presented for designing a finite difference domain decomposition algorithm for the two-and three-dimensional heat equations. The basic procedure is to define the finite difference schemes at the interface grid points with a smaller time step [image omitted]  and a larger mesh spacing h¯. The stability region of the algorithm is expanded Jd2 times compared with the classical explicit scheme, and a better error bound of the numerical solutions is obtained when r¯=1/6. Numerical experiments are also presented.
What's in a gaze?: the role of eye-gaze in reference resolution in multimodal conversational interfaces
Authors: Zahar Prasov, Joyce Y. Chai
Venue: Proceedings of the 13th international conference on Intelligent user interfaces (2008)

Multimodal conversational interfaces allow users to carry a dialog with a graphical display using speech to accomplish a particular task. Motivated by previous psycholinguistic findings, we examine how eye-gaze contributes to reference resolution in such a setting. Specifically, we present an integrated probabilistic framework that combines speech and eye-gaze for reference resolution. We further examine the relationship between eye-gaze and increased domain modeling with corresponding linguistic processing. Our empirical results show that the incorporation of eye-gaze significantly improves reference resolution performance. This improvement is most dramatic when a simple domain model is used. Our results also show that minimal domain modeling combined with eye-gaze significantly outperforms complex domain modeling without eye-gaze, which indicates that eye-gaze can be used to potentially compensate a lack of domain modeling for reference resolution.
Design and performance issues of slave-slave cluster interconnection in 802.15.4 beacon enabled networks
Authors: Jelena Misic
Venue: International Journal of Parallel, Emergent and Distributed Systems (2007)

In this paper, we consider interconnection of IEEE 802.15.4 beacon enabled network clusters using ordinary network nodes as bridge nodes. Bridge design involves uplink transmission to the coordinator and downlink transmission to the bridge. The bridge periodically visits source and sink cluster and exchanges data using slotted CSMA-CA access. We develop an algorithm for inter-cluster communication and evaluate its performance for the array of three interconnected clusters. We indicate the range of traffic intensity where this design solution is operational.
Efficient rectilinear Steiner tree construction with rectangular obstacles
Authors: Chin-Long Wey
Venue: Proceedings of the 5th WSEAS International Conference on Circuits, Systems, Electronics, Control & Signal Processing (2006)

Rectilinear Steiner Minimal Tree (RSMT) is one of the key problems in VLSI/ULSI physical design. With the trend toward IP-block-based SoC design, the macro cells, such as memories, logic blocks, present in the design as obstacles and their shapes are generally rectangular. The RSMTRO (rectilinear Steiner minimal tree with rectangular obstacles) problem is to connect all pins through some extra points (called Steiner points) to achieve a minimal total length, while avoiding the intersection with any rectangular obstacles in the design. This study presents an efficient RSMTRO algorithm. The algorithm consists of two step process: (a) Path Construction; and (b) Path Assignment. A set of assignment rules was derived for path assignment. The developed algorithm can efficiently provide RSMTRO solution with good quality.
Longitudinal position of the quasi-stationary wave extremes over the Antarctic region from the TOMS total ozone
Authors: A. Grytsai, A. Evtushevsky, G. Milinevsky, A. Agapitov
Venue: International Journal of Remote Sensing (2007)

Zonal asymmetry of total ozone content (TOC) in the Antarctic region is analysed using the TOMS measurements in 1979-2004. The TOC longitudinal distribution at the individual latitude circles in the latitude band 55-75° S with the 5° step is considered. From the positions of the zonal wave extremes it is revealed that the TOC zonal minimum is displaced eastward in the longitudinal sector 60° W-0° E with total shift of about 50°. The zonal maximum position is rather stable in the quadrant 90° E-180° E. Evidence is obtained that averaged geographical location of the extremes at the five latitude circles reproduces the Antarctic continent boundary in the corresponding longitudinal sectors.
Degradation of Service Modelling and Investigation in WCDMA Mobile Communications
Authors: Ismat Aldmour, Khalid Al-Begain
Venue: Proceedings of the Tenth International Conference on Computer Modeling and Simulation (2008)

Erlang capacity is the average traffic tolerated by the network that is hard limited by a certain number of servers, the active user capacity, at a certain acceptable blocking percentage. In WCDMA, contrary to GSM or analogue AMPS, interference limits the active user capacity which means that we don’t have a hard limit on the number of users and therefore obtaining the Erlang traffic capacity is not a direct problem. However, a model for WCDMA active user capacity boundaries, on the uplink, is obtained which relates the maximum capacity of any service class to the number of users in other service classes. This enables the usage of Erlang B formula to calculate the blocking on a service by service basis. In this work, an overall performance parameter, Degradation of Service, DoS, is defined as a linear combination of all blocking percentages for the different services and is studied for the points on the flexible active capacity boundary. It is shown that this parameter can be useful for selecting asuitable operating point on the boundary for a given traffic as well as in the case of relaxed WCDMA cell operating below the boundary.
Casting out Demons: Sanitizing Training Data for Anomaly Sensors
Authors: Gabriela F. Cretu, Angelos Stavrou, Michael E. Locasto, Salvatore J. Stolfo, Angelos D. Keromytis
Venue: Proceedings of the 2008 IEEE Symposium on Security and Privacy (2008)

The efficacy of Anomaly Detection (AD) sensors depends heavily on the quality of the data used to train them. Artificial or contrived training data may not provide a realistic view of the deployment environment. Most realistic data sets are dirty; that is, they contain a number of attacks or anomalous events. The size of these high-quality training data sets makes manual removal or labeling of attack data infeasible. As a result, sensors trained on this data can miss attacks and their variations. We propose extending the training phase of AD sensors (in a manner agnostic to the underlying AD algorithm) to include a sanitization phase. This phase generates multiple models conditioned on small slices of the training data. We use these “micro-models” to produce provisional labels for each training input, and we combine the micro-models in a voting scheme to determine which parts of the training data may represent attacks. Our results suggest that this phase automatically and significantly improves the quality of unlabeled training data by making it as “attack-free” and “regular” as possible in the absence of absolute ground truth. We also show how a collaborative approach that combines models from different networks or domains can further refine the sanitization process to thwart targeted training or mimicry attacks against a single site.
Architecture for the development of context-sensitive mobile applications
Authors: Markus Aleksy, Thomas Butter, Martin Schader
Venue: Mobile Information Systems (2008)

Recent advances in the development of mobile terminals and the appropriate communication infrastructures have the consequence that new kinds of applications arise. This trend leads to more and more complex mobile client applications as well. In this paper, we present a generic architecture, which can be used for the development of context-sensitive mobile applications.
Analytical Noise-Rejection Model Based on Short Channel MOSFET
Authors: Vinay Jain, Payman Zarkesh-Ha
Venue: Proceedings of the 9th international symposium on Quality Electronic Design (2008)

Due to scaling down of semiconductor technology, modern deep-submicron VLSI circuits are becoming increasingly vulnerable to noise from multiple sources, including cross-talk, radiation-induced single event transient, and power supply noises.Noise Rejection Curve (NRC) has been used as a metric to model noise susceptibility of logic circuits to such sources. In this paper an analytical model for NRC, which includes short channel effects, is presented. The model uses only basic SPICE parameters and does not include any calibration parameter. Comparison with SPICE simulations using TSMC 0.25um CMOS process parameters, suggests that the proposed model can accurately predict NRC characteristic of variety of logic circuits.
A Taxonomy of Data Prefetching Mechanisms
Authors: Surendra Byna, Yong Chen, Xian-He Sun
Venue: Proceedings of the The International Symposium on Parallel Architectures, Algorithms, and Networks (2008)

Data prefetching has been considered an effective way to mask data access latency caused by cache misses and to bridge the performance gap between processor and memory. With hardware and/or software support, data prefetching brings data closer to a processor before it is actually needed. Many prefetching techniques have been proposed in the last few years to reduce data access latency by taking advantage of multi-core architectures. In this paper, we propose a taxonomy that classifies various design concerns in developing a prefetching strategy. We discuss various prefetching strategies and issues that have to be considered in designing a prefetching strategy for multi-core processors.
Sensor-based Pervasive Healthcare System: Design and implementation
Authors: Hsu-Yang Kung, Chi-Yu Hsu, Mei-Hsien Lin
Venue: Journal of High Speed Networks (2007)

With rapid progress in wireless sensor networks (WSN) and pervasive computing technology, development of WSN-based pervasive healthcare systems, which provide patients and healthcare professionals with a convenient and efficient e-health environment, have become one of important and popular research topics in Health Information Systems (HIS). This paper proposes a Sensor-based Pervasive Healthcare (SPH) System, which comprises the Home Healthcare End (HHE) system, E-healthcare Service Provider (ESP) and E-healthcare Control Center (ECC). At the ECC, healthcare professionals remotely monitor the physiological status of patients using the WSN-based HHE system. The ESPs provide patients and healthcare professionals of the ECC with healthcare information services. The ESP is developed based on proposed Healthcare Service Middleware (HSM), which integrates the heterogeneous computing and communication devices, and provides the flexible healthcare platform to enrich the healthcare services. Additionally, a Seamless Healthcare Information Delivery (SHID) scheme is proposed to allow healthcare professionals to access patients' with their relevant healthcare data anywhere in real-time without manual manipulations. The ultimate objective of the proposed SPH system is to effectively reduce healthcare labor and to further provide a streamlined, convenient, and low cost healthcare platform for patients and healthcare professionals.
Prior language experience and language anxiety as predictors for non-native language commercial website use intention
Authors: Hui-Jen Yang, Wen-Yu Tsao, Yun-Long Lay, Minder Chen, YiChing Liou
Venue: International Journal of Human-Computer Studies (2008)

Based on the research model, language anxiety, prior non-native language experience, Internet self-efficacy and language self-efficacy are analyzed for the intention to use non-native language commercial web sites, respectively. Prior non-native language experience has affected language anxiety, language self-efficacy and intention to use non-native language commercial web sites, respectively. By the same token, whether or not Internet self-efficacy and language self-efficacy affected by language anxiety is also examined. A valid sample of 418 undergraduates was tested in this study. Regression analysis results fully supported the model tested. These results suggest that language anxiety, prior non-native language experience, language self-efficacy and Internet self-efficacy have an effect on the intention to use non-native language commercial web sites. Prior non-native language experience has significantly affected language anxiety, language self-efficacy and the intention to use the non-native language commercial web sites, respectively. Furthermore, language anxiety has significantly affected language self-efficacy and Internet self-efficacy, respectively. Educational research and practitioner implications are provided at the end of the paper.
Sdp gaps and ugc hardness for multiway cut, 0-extension, and metric labeling
Authors: Rajsekar Manokaran, Joseph (Seffi) Naor, Prasad Raghavendra, Roy Schwartz
Venue: Proceedings of the 40th annual ACM symposium on Theory of computing (2008)

The connection between integrality gaps and computational hardness of discrete optimization problems is an intriguing question. In recent years, this connection has prominently figured in several tight UGC-based hardness results. We show in this paper a direct way of turning integrality gaps into hardness results for several fundamental classification problems. Specifically, we convert linear programming integrality gaps for the Multiway Cut, 0-Extension, and and Metric Labeling problems into UGC-based hardness results. Qualitatively, our result suggests that if the unique games conjecture is true then a linear relaxation of the latter problems studied in several papers (so-called earthmover linear program) yields the best possible approximation. Taking this a step further, we also obtain integrality gaps for a semi-definite programming relaxation matching the integrality gaps of the earthmover linear program. Prior to this work, there was an intriguing possibility of obtaining better approximation factors for labeling problems via semi-definite programming.
Design and Implementation of Visual Inspection System in Automatic Bottling System Based on PLC
Authors: Denni Kurniawan, Riza Sulaiman
Venue: Proceedings of the 2008 Second Asia International Conference on Modelling & Simulation (AMS) (2008)

This paper explains on the design and implementation of automatic visual inspection system in automatic control system based on Programmable Logic Controller (PLC). In addition, this paper also give solution on how to modify conventional PLC to be integrated with visual inspection system. This modification method is more efficient than buying a new PLC and enhances the ability of it. Integration of these systems is implemented in Modular Automation Production System (MAPS). MAPS is a miniature of real bottling system construct from some module which have different function but are integrated togather. Visual inspection is done by using low cost and common web cam camera. Every bottle image will be caugth by camera and then will be analysed using Real–TIVI program. There are three decisions taken based on the result. The first decision is to accept the bottle, if the size is appropriate with bottle ‘A’. The second decision is to accept if the size of bottle appropriate with bottle ‘B’. The last decision is to reject the bottle if the size is not appropriate. This decision then will be sent to PLC through dc hard wire cable. The testing of this system is done in Robotic Laboratory Faculty Information Science and Technology (FTSM) University Kebangsaan Malaysia (UKM). The result showed good performance from the system. The method used in this research can be implemented in other industries such as pharmacy and food and drink inspection
Computing Curricula for the 21st Century
Authors: Andrew J. Kornecki
Venue: IEEE Distributed Systems Online (2008)

This article describes the role and place of software engineering in modern computing curricula, focusing on dependable systems that can be implemented using microprocessors and programmable logic. In this time of the increasing role of software and proliferation of computing in all areas of technology and human endeavor, there is critical need for education of engineers who can understand the system as a whole, appreciating both software and hardware and their mutual connection. The similarity and difference of approaches between traditional computing software and modern programmable-logic hardware is discussed. Modern systems require good engineering considering not only the system's functionality but also dependability and safety.
Very Fast Parallel Matrix and Polynomial Arithmetic
Authors: W. Eberly
Venue: Proceedings of the 25th Annual Symposium onFoundations of Computer Science, 1984 (1984)

We present very efficient arithmetic circuits for the computation of the determinants and inverse of band matrices and for interpolation and polynomial arithmetic over arbitrary ground fields. For input size n the circuits for band matrix inversion (for constant band width) over infinite fields, and the circuits for polynomial arithmetic over arbitrary fields, have optimal depth 0(log n) and polynomial size. The algorithm for band matrix inversion is based on an extension of the method of modification (from numerical analysis) which includes a formula for the determinant of a modified matrix. 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
Online stickiness: its antecedents and effect on purchasing intention
Authors: Judy Chuan-Chuan Lin
Venue: Behaviour & Information Technology (2007)

Website stickiness, the website's ability to retain online customers and prolong his/her duration of each stay, is one of the key factors to e-commerce success. However, how to make customers stick around is still unclear to online retailers. This paper examines the antecedents as well as effect of customer's intention to stick on a website. A model is developed and tested using a survey of 434 web users. The results confirm that the web user's willingness to stick to a website is a strong predictor of his/her intention to transact. Web managers thus need to put emphasis on the creation of the website stickiness. The results of this study also suggest that the formation of the stickiness is affected by web user attitude towards a website, trust in a website and the quality of website content. Implications of these findings are discussed for researchers and practitioners.
Collective web usability analysis: cognitive and activity walkthroughs
Authors: Hokyoung Ryu
Venue: International Journal of Web Engineering and Technology (2008)

This paper reviews two walkthrough methods for the web design practitioner to assess their web-based systems. Their relative advantages and weaknesses, and suggestions for web evaluation are offered, with a brief website example. Based on these analyses, some changes are suggested to website evaluation to improve accuracy and reliability of the current walkthrough methods; however, it is not a comparison between the walkthrough techniques in order to determine which technique is best at detecting usability problems of a website.