ppxscal/embedding_network huggingface dataset:
Indirect frequency estimation based on second-order adaptive FIR notch filter
Authors: R. Punchalard, J. Koseeyaporn, P. Wardkein
Venue: Signal Processing (2009)

This paper deals with estimating the frequency of sinusoidal signal buried in broad band noise. The simple unbiased indirect frequency estimation (IFE) algorithm is proposed for a second-order adaptive finite impulse response (FIR) notch filter with constrained zeros. The technique of estimating input noise variance is employed to remove the bias existing in the estimated filter parameter. Also, the difference equation for the convergence of the expectation of the estimated parameter and the closed-form of steady state estimation mean square error (MSE) are derived. In addition, extensive simulations are conducted to corroborate the efficiency of the proposed estimator with the theoretical analysis.
Global-scale peer-to-peer file services with DFS
Authors: Antony Chazapis, Georgios Tsoukalas, Georgios Verigakis, Kornilios Kourtis, Aristidis Sotiropoulos, Nectarios Koziris
Venue: Proceedings of the 8th IEEE/ACM International Conference on Grid Computing (2007)

The global inter-networking infrastructure that has become essential for contemporary day-to-day computing and communication tasks, has also enabled the deployment of several large-scale data sharing overlays. Communities collaboratively aggregate and distribute file and storage resources either in the controlled environment of the Grid, or hidden under the anonymity cloak created by peer-to-peer protocols. Both designs exhibit unique properties and characteristics: Peer-to-peer algorithms address the formation of vast, heterogeneous and dynamic sharing networks, while Grids focus on policy enforcement and accounting features. A distributed data management facility that will assimilate respective practices has been envisioned by numerous related research initiatives, especially when there is a need to incorporate disperse resources in large pools, without relinquishing participants of their respective rights. In this paper, we describe the Distributed File Services (DFS) architecture — a peer-to-peer service overlay, which allows distinct administrative entities to form arbitrary file distribution relationships. Each DFS peer can be uniquely authenticated and maintains direct control of its own namespace and storage assets by defining corresponding authorization directives and policies. The peer-to-peer nature of the system allows for scalable deployment and resource allocation, either in a stand-alone scenario or in the Grid context. Moreover, we introduce the notion of a “web of files”, as a non-hierarchical, global-scale namespace of distributed data collections and elaborate on a prototype implementation that features novel semantics for integrating our architectural principles and concepts into the operating system level.
Bimanual tangible interaction with mobile phones
Authors: Darren Edge, Alan F. Blackwell
Venue: Proceedings of the 3rd International Conference on Tangible and Embedded Interaction (2009)

In the context of tangibility, mobile phones are rapidly becoming sensor-rich handheld computers with the potential to take better advantage of our physical capabilities and our lifetime of experiences interacting both in and with the world around us. In this paper, we analyse four different ways in which mobiles can be used to represent and control digital information, showing that each resulting interaction style is characterized by a unique coordination of the user's attention and two hands in relation to the mobile device. We present our analysis in terms of a framework that can be used to critically examine future schemes of bimanual interaction with mobile phones.
TopLog: ILP Using a Logic Program Declarative Bias
Authors: José Carlos Santos
Venue: Proceedings of the 24th International Conference on Logic Programming (2008)

Although Inductive Logic Programming can have other usages such as program synthesis, it is normally used as a logic based supervised machine learning algorithm. The usual setting for its application is, given: 1) a set of background knowledge facts B, 2) a set of examples E, find: a set of hypotheses H, such that B,H&thinsp;⊧&thinsp;E . H, the induced model, is a set of Horn rules thus being easily comprehensible by a human.
A study on the applications of data mining techniques to enhance customer lifetime value
Authors: Chia-Cheng Shen, Huan-Ming Chuang
Venue: WSEAS Transactions on Information Science and Applications (2009)

In today's competitive environment, a successful company must provide better customized services, that are not only acceptable to customers but satisfy their needs as well, in order to survive and succeed in gaining an advantage against competition. It has been proven by many studies that it is more costly to acquire new customers than to retain old ones. Consequently, evaluating current customers in order to enhance their lifetime value becomes a critical factor to decide the success or failure of a business. This study applies data from customer and transaction databases of a department store, based on the RFM model, and does clustering analysis to recognize high value customer groups for cross-selling promotions. Study findings show that clustering analysis can locate high value customers, and the company can then apply appropriate target marketing to enhance their lifetime value effectively. The implication for the marketer is that leveraging techniques of data mining can make the most from data of customers and transactions databases and thus create sustainable competitive advantages.
Using direct sequence spread spectrum in marine radio communication
Authors: Jacek Wszołek, Jacek Danda
Venue: Proceedings of the 8th conference on Applied computer scince (2008)

This paper proposes application of the DSSS CDMA method (Direct Sequence Spread Spectrum Code Division Multiplexing Access) in marine voice and data transmission. The spread spectrum method is based on conversion of signal into the form of wider band, while signal power remains on the same level. This conversion causes decrease of power spectral density, which is proportional to the spreading factor. Spectrum spreading is achieved by multiplying the input signal by a code sequence (spreading code). Simultaneous transmission can be achieved by spreading multiple signals by uncorrelated and orthogonal sequences. Power spectral density of CDMA is usually lower than noise power, therefore the transmission remains transparent for other receivers and does not affect other systems. Another advantage of the CDMA is its robustness against the narrowband noise. For a correct reception of the CDMA signal, a precise synchronization is necessary. This results from a method of despreading, which is based on another multiplication of signal and the spreading code. This operation should be performed in-phase. If not, on the input of detector appears additional noise.
A mathematical model of character string manipulation
Authors: Sakti Pramanik
Venue: Proceedings of the May 19-22, 1980, national computer conference (1980)

Every insert and delete operation on a string of characters causes it to expand or contract in memory. If on the other hand, these commands are saved, the character string can be updated at the end of the editing session. The advantage of doing this is to move any character at the most once in memory. This is possible because the final position of a character in the string can be determined from the saved edit functions. In Figure 1 below it is shown that a "Delete character in position 3" and then an "Insert a character X before the 3rd character position" can be combined into a single edit function, "Replace the character in position 3 by the character X."
Transmission Performance of Spectrum-Sliced Incoherent 2-D FFH-OCDMA Systems Using Modified Prime-hop Codes
Authors: Shaobo Sun, M. S. Leeson
Venue: Proceedings of the 2009 WRI International Conference on Communications and Mobile Computing - Volume 02 (2009)

Two-dimensional optical CDMA has been proved to be a promising access technique providing many distinctive merits. A system using fiber Bragg gratings to spectrally slice the incoherent light from a low cost light source is proposed. The optical beat noise in such an incoherent system is studied as the dominant noise source. The sliced wavelengths are thereafter encoded according a predetermined pattern. A modified prime hop code (MPHC) scheme is employed to lower the power loss and reduce the BER degradation caused by the beat noise. Comparison between MPHC and prime hop codes (PHCs) regarding the beat noise indicates that MPHC is very suitable for the proposed incoherent system
ML-Chord: A multi-layered P2P resource sharing model
Authors: Eric Jui-Lin Lu, Yung-Fa Huang, Shu-Chiu Lu
Venue: Journal of Network and Computer Applications (2009)

In recent years, due to the emergence of P2P technology, people rely on the Internet to share resources. It is believed that the number of users and shared resources will become enormously huge. As a result, many researches have been dedicated to improve the scalability and efficiency of P2P models. In this paper, we propose a multi-layered P2P resource sharing model, called ML-Chord, that assigns nodes into Chord-like layers based on the categories of shared resources. From the experimental results, it shows that ML-Chord is both efficient and scalable.
Issues and solutions in assessing object-oriented programming skills in the core education of computer science and information technology
Authors: Norazlina Khamis, Sufian Idris
Venue: Proceedings of the 12th WSEAS international conference on Computers (2008)

Traditional assessment of Computer Science, Software Engineering and IT are with Grade. The feedback from industry, government, and professional bodies is that too often, the grades do not reflect the actual software engineering or programming skills that the students have acquired. Quite often students get good grades but still facing great challenges at workforce, or have difficulties to take on real programming jobs. With the growing shortage of real ICT skilled professionals and with decline in student enrolments in computer science, software engineering and IT, as educators, we need new methods to measure our ICT Educations and not just grades, so that we know the impact of our education on our graduates and their level of real knowledge and skills and their likely contribution dimension to the ICT industries. This paper will detail the issues and possible solutions that could be used in enhancing this assessment and measurement by focusing on assessment of object oriented programming courses.
EventSummarizer: a tool for summarizing large event sequences
Authors: Jerry Kiernan, Evimaria Terzi
Venue: Proceedings of the 12th International Conference on Extending Database Technology: Advances in Database Technology (2009)

We present EventSummarizer - a tool for extracting comprehensive summaries from large event sequences. EventSummarizer takes as input a sequence with events of different types that occur during an observation period, and creates a partitioning of this time period into contiguous non-overlapping intervals such that each interval can be described by a simple model. Within each interval local associations between events of different types are reported. EventSummarizer runs on top of any Relational DataBase Management System (RDBMS), on tables with a timestamp attribute. Our system is parameter free and has a visual interface that provides the user with a global view of the input sequence via the segmentation of the timeline. The easy-to-use interface provides the user with the option to further examine the activity and associations of event types within each segment.
A generic framework for real-time discrete event simulation (DES) modelling
Authors: Siamak Tavakoli, Alireza Mousavi, Alexander Komashie
Venue: Proceedings of the 40th Conference on Winter Simulation (2008)

This paper suggests a generic simulation platform that can be used for real-time discrete event simulation modeling. The architecture of the proposed system is based on a tested flexible input data architecture developed in Labview, a real-time inter-process communication module between the Labview application and a discrete event simulation software (in this case Arena). Two example applications in the healthcare and manufacturing sectors are provided to demonstrate the ease of adaptability to such physical system.
Decision Theory, Intelligent Planning and Counterfactuals
Authors: Michael John Shaffer
Venue: Minds and Machines (2009)

The ontology of decision theory has been subject to considerable debate in the past, and discussion of just how we ought to view decision problems has revealed more than one interesting problem, as well as suggested some novel modifications of classical decision theory. In this paper it will be argued that Bayesian, or evidential, decision-theoretic characterizations of decision situations fail to adequately account for knowledge concerning the causal connections between acts, states, and outcomes in decision situations, and so they are incomplete. Second, it will be argues that when we attempt to incorporate the knowledge of such causal connections into Bayesian decision theory, a substantial technical problem arises for which there is no currently available solution that does not suffer from some damning objection or other. From a broader perspective, this then throws into question the use of decision theory as a model of human or machine planning.
Storage space estimation for videos using fading channels
Authors: Satish Chand, Hari Om
Venue: Digital Signal Processing (2009)

In this paper, we propose a model for estimating the buffer storage for providing continuous delivery of the video data to users. The model incorporates the jitter delay, which is a switching delay between two consecutive video segments being transmitted through a logical channel. The jitter delay is assumed to be Rayleigh distributed as it characterizes the channel fading.
Talktic: a development environment for pervasive computing applications
Authors: Yoshimasa Niwa, Satoru Tokuhisa, Masa Inakage
Venue: Proceedings of the 2008 International Conference on Advances in Computer Entertainment Technology (2008)

Talktic is a platform for the easy production of entertainment content developed under the keyword of "pervasive computing." The Talktic platform consists of runtime environment, library, and development environment to support applications using an MCU board, personal computer, and network. It uses a virtual machine in the runtime environment and provides a programming environment and library based on a lightweight scripting language for easy development of entertainment content. The linkage with web services and the high degree of compatibility for the virtual machine and scripts are expected to generate new forms of entertainment content.
Interaction quality within communities of practice: contextual factors of utilising different communication media
Authors: Jan Kratzer, Katja Zboralski, Roger T. A. J. Leenders
Venue: International Journal of Networking and Virtual Organisations (2009)

The quality of communication is essential for most organisational processes, in particular for creating new knowledge. Among other instruments many organisations utilise 'Communities of Practice' (CoPs) to leverage knowledge more successfully. The quality of interaction among community members is recognised as the major success-driving factor. In an empirical investigation of 22 CoPs with all 191 community members of a multinational company, we explore how the utilisation of different communication media - face-to-face, synchronous (virtual) communication and asynchronous (virtual) communication - adds to the quality of interaction. Based on our empirical results, three general conclusions can be drawn. First, the results of our study support theories suggesting that media of smaller bandwidth can be utilised when transferring complex contents. Second, the interaction quality is negatively affected by the increasing number of CoP members. Third, the age of CoPs appears to be an important factor for the interaction quality of CoPs.
From 2D Images to 2.5D Sprites: A Layered Approach to Modeling 3D Scenes
Authors: Richard Szeliski, P. Anandan, Simon Baker
Venue: Proceedings of the IEEE International Conference on Multimedia Computing and Systems - Volume 2 (1999)

We propose a framework for modeling the appearance and geometry of 3D scenes as a collection of approximately 2D layers. Each layer corresponds to a view-based representation of a portion of the scene whose disparity across the given set of views can be approximately modeled using a planar surface. The representation of each layer consists of the parameters of the plane, a color image that specifies the appearance of that portion of the scene, a per-pixel opacity map, and a per-pixel depth offset relative to the nominal plane. The layers are recovered by analyzing the pixel disparities across the input images. Depth and color information can be integrated from multiple images even in regions that may be partially occluded in some of the views. New views of the scene can be generated efficintly by rendering each individual layer from that view and combining the layer images in a back to front order. Layers from different scenes can be combined into a new synthetic scene with realistic appearance and geometric effects for multimedia authoring applications.
Sound Absorption Measurement of Acoustical Material and Structure Using the Echo-Pulse Method
Authors: Liang Sun, Hong Hou, Liying Dong, Fangrong Wan
Venue: Proceedings of the 2009 International Conference on Computer Engineering and Technology - Volume 01 (2009)

A new approach is proposed for measuring the sound absorption coefficient of material at normal incidence, that bases on the echo-pulse method in a circular tube. Two types of acoustical material and structure were employed: foam and pipe exit. Two different waveforms called the Butterworth and the damped sine pulse are successfully generated and used as incident pulses in the experiment of sound absorption measurement in a circular pipe. The absorption coefficient of the acoustical material measured by the echo-pulse method is consistent with that of B&K 4206 impedance tube measurement. Discrepancy between them is totally less than 10% in broadband frequency range from 200 Hz to 5k Hz, mainly due to the different internal tube diameters of these two tubes and the fitting of the sample, i.e. the difference between the sample diameter and the internal tube diameter. Since the incident sound pulses are all with the features of regular waveform, short duration and broadband frequency spectrum, sound absorption measurement results conducted by the echo-pulse method are more reliable than that of B&K 4206 impedance tube method especially in low-frequency range. Further validation of this new method is also given through the absorption coefficient measurement of pipe exit. The echo-pulse method is relatively simple as only single microphone is used for measurements. It is believing that this method could also be used for in-situ measurement of sound absorption coefficient in outer space.
Simulation and Analysis of Protocols in Ad Hoc Network
Authors: Runcai Huang, Yiwen Zhuang, Qiying Cao
Venue: Proceedings of the 2009 International Conference on Electronic Computer Technology (2009)

Simulation and analysis of protocols for network topology is an important research method in network field. The paper introduces the feature and infrastructure of Ad Hoc. The Ad Hoc network and its three protocols (AODV、DSDV、DSR) are presented in detail. The process and method of the simulation of mobile Ad Hoc is analyzed in aspects of objection, scheme design, environment setting and OTcl script writing. Finally, the three protocols are simulated by NS2 software, the relevant simulation working diagram and parameter comparison table are presented, and the simulation results are analyzed in aspects of packet delivery fraction and end-to-end time delay. The comparison of simulation results concludes that in the circumstance of non-active movement, the DSR protocol is available due to its low packet loss rate and low end-to-end time delay. While in the circumstance of active movement, AODV protocol is available due to its high packet delivery fraction and low end-to-end time delay, because it embodies the mixed features of DSR and DSDV protocol.
Gaussian distribution of inhomogeneous barrier height in tungsten/4H-SiC (000-1) Schottky diodes
Authors: S. Toumi, A. Ferhat-Hamida, L. Boussouar, A. Sellai, Z. Ouennoughi, H. Ryssel
Venue: Microelectronic Engineering (2009)

The Gaussian distribution model have been used to analyze the anomalies observed in tungsten (W)/4H-SiC current voltage characteristics due to the barrier inhomogeneities that prevail at the metal-semiconductor interface. From the analysis of the forward I-V characteristics measured at elevated temperatures within the range of 303-448K and by the assumption of a Gaussian distribution (GD) of barrier heights (BHs), a mean barrier height @F@?"B"0 of 1.277eV, a zero-bias standard deviation @s"0=0.092V and a factor T"0 of 21.69K have been obtained. Furthermore the modified Richardson plot according to the Gaussian distribution model resulted in a mean barrier height @F@?"B"0 and a Richardson constant (A^*) of 1.276eV and 145A/cm^2K^2, respectively. The A^* value obtained from this plot is in very close agreement with the theoretical value of 146A/cm^2K^2 for n-type 4H-SiC. Therefore, it has been concluded that the temperature dependence of the forward I-V characteristics of the W/4H-SiC contacts can be successfully explained on the basis of a thermionic emission conduction mechanism with Gaussian distributed barriers. In addition, a comparison is made between the present results and those obtained previously assuming the pinch-off model.
Multilingual opinion holder identification using author and authority viewpoints
Authors: Yohei Seki, Noriko Kando, Masaki Aono
Venue: Information Processing and Management: an International Journal (2009)

Opinion holder identification research is important for discriminating between opinions that are viewed from different perspectives. We propose a new opinion holder identification method that is based on a differentiation between the author and authority viewpoints in opinionated sentences. In our method, the author- and authority-opinionated sentences were extracted, respectively, by utilizing the different features because their writing styles were different. Although the researchers have not focused on it, this differentiation is important for correctly identifying opinion holders. We describe our participation in the NTCIR-6 Opinion Analysis Pilot Task by focusing on the opinion holder identification results in Japanese and English. The evaluation results showed that our system performed fairly well with respect to Japanese documents, and postsubmission analysis has revealed that improvements could be made with respect to English documents as well.