ppxscal/embedding_network huggingface dataset:
Measures for ETL processes models in data warehouses
Authors: Lilia Muñoz, Jose-Norberto Mazón, Juan Trujillo
Venue: Proceeding of the first international workshop on Model driven service engineering and data quality and security (2009)

In data warehousing, ETL (Extract, Transform, and Load) processes take charge of extracting the data from data sources that would be contained in the data warehouse. Due to their relevance, the quality of these processes should be formally assessed since the early stages of development, in order to avoid making bad decisions as a result of incorrect data. In this paper, a set of measures to evaluate the structural complexity of ETL process models at conceptual level is presented. Moreover, this study is accompanied by four experiments whose aim is the empirical validation of the proposed measures. The main advantage of this approach is the early evaluation of ETL process models. This early evaluation support designers in their maintenance tasks. This proposal is based on UML (Unifield Modeling Language) activity diagrams for modeling ETL processes and the adoption of the FMESP (Framework for the Modeling and Evaluation of Software Processes) framework.
A Novel Steganography Algorithm Based on CRC
Authors: Ling Wu, Li-Na Wang
Venue: Proceedings of the 2009 International Conference on Multimedia Information Networking and Security - Volume 02 (2009)

Abstract-A novel steganography algorithm CRCsteg based on CRC method is proposed. CRCsteg exploits the 1-1 and onto mapping from x^j-1 to {R(x)}\{0} over GF(2^k), s.t.1 ≤ j ≤ 2^k -1 and k = deg(R) +1, to embed the positive integer j into 2^k-1 bits cover stream. The new method has similar performance with previous matrices embedding schemes, and much simpler embedding/extracting codes and computation, as no need of matrix multiplication. With small and stable MSE, CRCsteg has no detectable influence on visual quality and statistical features. The value of parameter k varies controlled by a key. The action of parameter k on the speed and robustness is also discussed.
Single-anchor indoor localization using a switched-beam antenna
Authors: Gianni Giorgetti, Alessandro Cidronali, Sandeep K. S. Gupta, Gianfranco Manes
Venue: IEEE Communications Letters (2009)

We propose an RF-based localization system that works using a single anchor node. The anchor is equipped with a switched-beam directional antenna that is installed on the ceiling of a room and collects signal strength information sufficient for absolute 2D target positioning. Indoor measurements are used to show satisfactory localization results with range-free (proximity), range-based and fingerprinting schemes.
Exact method for the error probability calculation of three-dimensional signal constellations
Authors: Majid Khabbazian, Md. Jahangir Hossain, Mohamed-Slim Alouini, Vijay K. Bhargava
Venue: IEEE Transactions on Communications (2009)

The contribution of this letter is the computation of exact symbol error probability (SEP) of three-dimensional (3- D) signal constellations over an additive white Gaussian noise (AWGN) channel. The originality of the proposed method is that it can be applied to any arbitrary 3-D constellation whose decision regions may not meet at right angles. We express the SEP in a triple integral form which is further simplified. The simplified form requires a single integral evaluation of standard "erf" function. Using the derived exact SEP formula, we plot SEP for a number of selected 3-D constellations. The SEP obtained using the proposed formula is validated by simulation results. It is also compared with the union bound approximation, an upper bound for SEP.
Multiple-rate low-density parity-check codes with constant blocklength
Authors: Andres I. Vila Casado, Wen-Yen Weng, Stefano Valle, Richard D. Wesel
Venue: IEEE Transactions on Communications (2009)

This paper describes and analyzes low-density parity-check code families that support variety of different rates while maintaining the same fundamental decoder architecture. Such families facilitate the decoding hardware design and implementation for applications that require communication at different rates, for example to adapt to changing channel conditions. Combining rows of the lowest-rate parity-check matrix produces the parity-check matrices for higher rates. An important advantage of this approach is that all effective code rates have the same blocklength. This approach is compatible with well known techniques that allow low-complexity encoding and parallel decoding of these LDPC codes. This technique also allows the design of programmable analog LDPC decoders. The proposed design method maintains good graphical properties and hence low error floors for all rates.
Entering handwriting into computers using a digital pen
Authors: Marie J. Myers
Venue: Proceedings of the 10th IASTED International Conference on Computers and Advanced Technology in Education (2007)

Transposing handwriting through a digital pen into typed text for language learning are discussed. Researchers agree that there are specificities of first language (L1) writing that could affect writing in a second language (L2) because writing styles are language specific. In our study of the conversion of handwritten notes to computer printed text with the Logitech [1] MyScripts&reg; handwriting recognition software in both French and English, we uncovered what affected the conversion to typed texts of the writing modes in L1 and L2 by the same writer. The question of penmanship is explored as is the question of transfer from handwritten language to the printed conversion. Suggestions are made about possible adjustments, both to the technology and for the user in the passage from L1 to L2.
An activity theory perspective on e-teaching in a virtual high-school classroom
Authors: Elizabeth Murphy
Venue: Proceedings of the 10th IASTED International Conference on Computers and Advanced Technology in Education (2007)

In the case study reported on in this paper, we identified deviations in the practice of the e-teacher that point to germs of new forms of teaching. Our case was distance education at the high-school level within the province of Newfoundland and Labrador, Canada. Participants were 13 of the 28 e-teachers employed by an organization responsible for the delivery of distance education as well as seven of its management and support personnel. Our theoretical framework was Cultural-Historical Activity Theory (CHAT). Data collection relied on semi-structured interviews conducted primarily online. Data analysis involved identifying contradictions, categorizing them, and, from within the categories, identifying visible manifestations of deviations in the e-teachers' practice leading to innovation. These deviations were clustered and labelled thematically as follows: from controlling to engaging student attention; from e-teacher-preferred tools to student-preferred tools; from e-teacher instruction to independent student learning; from a single e-teacher's voice to multiple students' voices. Use of Activity Theory provided an explanatory lens to appreciate a case of how the introduction of new tools can bring about positive change in teachers' practice.
Multiuser performance of M-ary orthogonal coded/balanced UWB transmitted-reference systems
Authors: Dong In Kim
Venue: IEEE Transactions on Communications (2009)

A tractable and compact closed-form expression on the channel-averaged signal-to-interference-plus-noise ratio (SINR) is derived for M-ary orthogonal coded/balanced transmitted-reference (BTR) systems, taking into consideration both inter-pulse interference (IPI) and multiple-access interference (MAI) in dense multipath ultra-wideband (UWB) channels. The UWB channel here is a realistic and standard one with lognormal channel gain distribution and double independent Poisson arrival distribution of cluster and ray. Hence, the analytical framework developed here can be applied to typical UWB channel models, especially considering the channel sparseness and cluster overlapping observed in realistic UWB channels. Based on the channel-averaged SINR, the effect of interpulse distance (between the reference and data pulses in BTR) on the multiuser performance is fully investigated. A proper selection of user-specific inter-pulse distances in multiuser scenario is then determined to maximize the user capacity for a given UWB channel.
Improved algorithms for cancellation carrier optimization to suppress the OFDM OOB spectrum
Authors: Takayuki Matsuura, Yasutaka Iida, Chenggao Han, Takeshi Hashimoto
Venue: IEEE Communications Letters (2009)

Cancellation carriers (CCs) are known to be effective for suppressing the out-of-band (OOB) spectrum of an orthogonal frequency-division multiplexing (OFDM) signal and are useful to realize OFDM-based overlay systems. We show that the known minimum-mean-square-error (MMSE) algorithm is not sufficient to reduced the OOB spectral peaks in the vicinity of transmission band boundaries compared to a direct min-max algorithm and show that a weighted MMSE (WMMSE) algorithm can attain almost the same suppression performance as the direct min-max algorithm with the same computational cost as the MMSE algorithm.
Blind Audio Watermarking Scheme for Copyright Protection of Multi-user
Authors: Tingting Xu, Zhen Yang
Venue: Proceedings of the 2009 International Conference on Multimedia Information Networking and Security - Volume 02 (2009)

This paper proposes a blind audio watermarking scheme for marking multiple copyright owners. The problem of interference between each watermark is solved by scrambling technology. Experimental results show good transparency and robustness of the scheme. The watermarking extraction procedure depends on the private key of specific copyright owner, which guarantees the security of the multi-watermarking scheme.
Development and preliminary validation of heart rate and breathing rate detection using a passive, ballistocardiography-based sleep monitoring system
Authors: David C. Mack, James T. Patrie, Paul M. Suratt, Robin A. Felder, Majd Alwan
Venue: IEEE Transactions on Information Technology in Biomedicine (2009)

Techniques such as ballistocardiography (BCG) that can provide noninvasive long-term physiological monitoring have gained interest due to a growing recognition of adverse effects from poor sleep and sleep disorders. The noninvasive analysis of physiological signals (NAPS) system is a BCG-based monitoring system developed tomeasure heart rate, breathing rate, and musculoskeletal movement that shows promise as a general sleep analysis tool. Overnight sleep studies were conducted on 40 healthy subjects during a clinical trial at the University of Virginia. The NAPS system's measures of heart rate and breathing rate were compared to ECG, pulse oximetry, and respiratory inductance plethysmography (RIP). The subjects were split into a training dataset and a validation dataset, maintaining similar demographics in each set. The NAPS system accurately detected heart rate, averaged over the prescribed 30-s epochs, to within less than 2.72 beats per minute of ECG, and accurately detected breathing rate, averaged over the same epochs, to within 2.10 breaths per minute of RIP bands used in polysomnography.
A shadow zone aware routing protocol for acoustic underwater sensor networks
Authors: Son T. Nguyen, Erdal Cayirci, Liang Yan, Chunming Rong
Venue: IEEE Communications Letters (2009)

Shadow zone and delay aware routing (SZODAR) scheme is a practical and distributed protocol that can find routes around shadow zones. In SZODAR, sensor nodes can raise or lower their acoustic transceivers to a depth such that shadow zones of the neighboring nodes are avoided. This paper presents the protocol working principle and preliminary calculations of the engineering parameters.
New globally asymptotic stability criteria for delayed cellular neural networks
Authors: Shen-Ping Xiao, Xian-Ming Zhang
Venue: IEEE Transactions on Circuits and Systems II: Express Briefs (2009)

This brief is concerned with the stability analysis for cellular neural networks with time-varying delays. First, an appropriate Lyapunov-Krasovskii functional is introduced to form some new delay-dependent stability conditions in terms of linear matrix inequalities (LMIs). Quite differently, these stability criteria are derived by using the convex combination property, which equivalently converts the original LMI containing a convex combination on the time-varying delay into two boundary LMIs. Second, this newly proposed approach is then extended to a class of uncertain neural networks with time-varying delays, from which new delay-dependent robust stability criteria are formulated. Finally, two numerical examples are given to show that the proposed criteria are of much less conservatism than the existing ones in the literature.
A systemic model of interaction analysis in CSCL
Authors: Jian Liao, Yanyan Li, Jingjing Wang, Ronghuai Huang, Zhenhong Zhang
Venue: Proceedings of the 10th IASTED International Conference on Computers and Advanced Technology in Education (2007)

Interactive analysis is the research focus of computer-supported collaborative learning (CSCL). At present, the academe hasn't reached consensus on which aspects should be analyzed. Based on the interpretation of activity system by activity theory, this paper presents an integrated model TSP (composed of Topic Space, Social Relationship and Process Pattern), which is the theoretical framework of the interactive analysis of CSCL, and also advocates introducing correlative research results in the field of computer to analyze and model the interaction of CSCL in terms of three aspects of TSP.
The spacing calculator software-A Visual Basic program to calculate spatial properties of lineaments
Authors: Thushan C. Ekneligoda, Herbert Henkel
Venue: Computers Geosciences (2006)

A software tool is presented which calculates the spatial properties azimuth, length, spacing, and frequency of lineaments that are defined by their starting and ending co-ordinates in a two-dimensional (2-D) planar co-ordinate system. A simple graphical interface with five display windows creates a user-friendly interactive environment. All lineaments are considered in the calculations, and no secondary sampling grid is needed for the elaboration of the spatial properties. Several rule-based decisions are made to determine the nearest lineament in the spacing calculation. As a default procedure, the programme defines a window that depends on the mode value of the length distribution of the lineaments in a study area. This makes the results more consistent, compared to the manual method of spacing calculation. Histograms are provided to illustrate and elaborate the distribution of the azimuth, length and spacing. The core of the tool is the spacing calculation between neighbouring parallel lineaments, which gives direct information about the variation of block sizes in a given category of structures. The 2-D lineament frequency is calculated for the actual area that is occupied by the lineaments.
On the outage capacity of a practical decoder accounting for channel estimation inaccuracies
Authors: Pablo Piantanida, Seyed Mohammad-Sajad Sadough, Pierre Duhamel
Venue: IEEE Transactions on Communications (2009)

The optimal decoder achieving the outage capacity under imperfect channel estimation is investigated. First, by searching into the family of nearest neighbor decoders, which can be easily implemented on most practical coded modulation systems, we derive a decoding metric that minimizes the average of the transmission error probability over all channel estimation errors. Next, we specialize our general expression to obtain the corresponding decoding metric for fading MIMO channels. According to the notion of Estimation-induced outage (EIO) capacity introduced in our previous work and assuming a block Rayleigh-fading channel, we characterize the maximal achievable information rates using Gaussian codebooks associated to the proposed decoder. These achievable rates are compared to the rates achieved by the classical mismatched maximum-likelihood (ML) decoder and the ultimate limits given by the EIO capacity. Numerical results show that the derived metric provides significant gains, in terms of achievable EIO rates and bit error rate (BER), in a bit interleaved coded modulation (BICM) framework, without introducing any additional decoding complexity. However, the achievable rates of such metric are still far from the EIO capacity.
A Novel Fast Mode Decision Scheme for Spatial Scalable Video Coding
Authors: Wenhao Zhang, Bo Yang, Kan Chang
Venue: Proceedings of the 2009 Third International Conference on Multimedia and Ubiquitous Engineering (2009)

In the scalable video coding extension of H.264 standard, the concept of inter-layer prediction is adopted to reduce the redundancy between the base layers and the enhancement layers. Thus, additional coding modes should be calculated during the macroblock mode decision procedure at the enhancement layers. It increases the computational complexity and may obstruct its practical applications. A fast mode decision scheme is developed in this paper to speed up the encoding of the enhancement layers. It makes use of reducing the number of the candidate modes and early termination the mode decision procedure adaptively. The experimental results show the proposed algorithm can achieve a reduction of encoding time by 30% to 70% with negligible bit-rate increases. 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
Preference Based Genetic Algorithm for the Optimum Design of Integrated Structural Control System
Authors: Wonsuk Park, Kwan-Soon Park, Dong-Ho Ha, Jinkyo F. Choo
Venue: Proceedings of the 2009 Fifth International Joint Conference on INC, IMS and IDC (2009)

This paper proposes an optimal design of a hybrid system for the mitigation of wind-induced vibration in high-rise buildings. Even if effective control performance can be achieved by the hybrid system which applies simultaneously both active and passive control devices, its design is extremely complicated due to the increase of the design variables. This paper considers a hybrid system composed of hybrid mass damper and viscous dampers. The corresponding design variables are the mass, tuning ratio, damping ratio, damper locations and capacity of the dampers. Since the minimization of cost factors is also a matter of utmost importance, the required control efforts and dynamic responses of the target structure are selected as objective functions to be minimized. Therefore, the problem is formulated as a multi-objective optimization problem involving the design of two different types of systems. The validity of the proposed optimization technique is verified through a wind-excited 20-story building with hybrid control system and comparative results with non-hybrid design approach are presented.
Enhanced Light Weight Route Optimization in Proxy Mobile IPv6
Authors: Young-Hyun Choi, Tai-Myoung Chung
Venue: Proceedings of the 2009 Fifth International Joint Conference on INC, IMS and IDC (2009)

Proxy Mobile IPv6 outperforms previous mobility protocols have been standardized by the Internet Engineering Task Force. However, Proxy Mobile IPv6 still involves the triangle routing problem in where data packets for the mobile node are delivered throughout inefficient routing paths. To address the triangle routing problem, two different Route Optimization schemes proposed that exclude the inefficient routing paths by creating the shortest routing path. In this paper, we proposed Correspondent Information Route Optimization scheme solves the problem by inefficient signaling cost of Dutta's route optimization. Using Correspondent Information for Correspondent binding updates process between the mobile access gateways which are caused by bi-path data communication of the mobile entities of different the mobile access gateway on the same local mobility anchor. The results of signaling cost performance evaluation show that performance of our proposed using correspondent information route optimization scheme is better than Liebsch's route optimization scheme as 45% for mobility of the data packets sender and Dutta's route optimization scheme as 20% for mobility of the data packets sender.
Distortionless Data Hiding Based on Slantlet Transform
Authors: Sushil Kumar, S. K. Muttoo
Venue: Proceedings of the 2009 International Conference on Multimedia Information Networking and Security - Volume 01 (2009)

In this paper we present a distortionless data hiding technique based on wavelet-like transform, known as Slantlet Transform (SLT). The proposed algorithm first encodes the original message using the encoder, T-codes. T-codes have shown to be more robust than the best known variable-length codes, Huffman codes. T-codes have a well-explained resyhchronization mechanism which leads to fast and reliable resynchronization. The secret data is then embedded in the high frequency sub-bands, viz., HH, HL and LH which are obtained by applying Slantlet transform to the cover-image. We use two steganography algorithms, viz., LSB algorithm and Thresholding algorithm for embedding data in the image. We show further that the original image can also be recovered from stego-image after the hidden data is extracted from it. It is known that SLT is a better candidate for signal compression compared to the DWT based scheme and it can provide better time localization. Experimental results have confirmed that the proposed algorithm yields better imperceptibility for the stego-images than the conventional DWT based scheme in case of low embedding rate and yields acceptable results for high embedding rate as well.
Accurate distributed range-based positioning algorithm for wireless sensor networks
Authors: Frankie K. W. Chan, H. C. So
Venue: IEEE Transactions on Signal Processing (2009)

Localization of sensor nodes is a fundamental and important problem in wireless sensor networks. In this correspondence a recursive distributed positioning algorithm is devised with the use of range measurements. Computer simulations are included to contrast the performance of the proposed approach with the conventional semi-definite relaxation positioning method as well as Cramér-Rao lower bound.
UWB WPAN receiver optimization in the presence of multiuser interference
Authors: Tomaso Erseghe, Stefano Tomasin
Venue: IEEE Transactions on Communications (2009)

We propose two new receiver architectures for a ultra wide band (UWB) system based on the IEEE 802.15.4a standard. The design objective is robustness against strong multiple access interference (MAI). The first proposed structure models MAI as an additive white Gaussian noise (AWGN) whose power is estimated at each frame, rather than on average, in such a way to take account of the impulsive nature of interference. The second approach aims at jointly optimizing demodulation and decoding, and, in this case, MAI is modeled as a generalized Gaussian mixture process. In both cases, the maximum likelihood receiver is derived. Numerical results in a IEEE 802.15.4a scenario show that the AWGN receiver with local power estimate provides a performance comparable to the best existing techniques, while requiring a much lower computational complexity. The joint optimization of demodulation and decoding provides a further gain, especially at low packet error rates, at the cost of an additional signal processing effort. Still, low complexity solutions holding the performance gap are identified in this latter class.