ppxscal/embedding_network huggingface dataset:
SMOCK: a scalable method of cryptographic key management for mission-critical wireless ad-hoc networks
Authors: Wenbo He, Ying Huang, Ravishankar Sathyam, Klara Nahrstedt, Whay C. Lee
Venue: IEEE Transactions on Information Forensics and Security (2009)

Mission-critical networks show great potential in emergency response and/or recovery, health care, critical infrastructure monitoring, etc. Such mission-critical applications demand that security service be "anywhere," "anytime," and "anyhow." However, it is challenging to design a key management scheme in current mission-critical networks to fulfill the required attributes of secure communications, such as data integrity, authentication, confidentiality, nonrepudiation, and service availability. In this paper, we present a self-contained public key-management scheme, a scalable method of cryptographic key management (SMOCK), which achieves almost zero communication overhead for authentication, and offers high service availability. In our scheme, a small number of cryptographic keys are stored offline at individual nodes before they are deployed in the network. To provide good scalability in terms of the number of nodes and storage space, we utilize a combinatorial design of public-private key pairs, which means nodes combine more than one key pair to encrypt and decrypt messages. We also show that SMOCK provides controllable resilience when malicious nodes compromise a limited number of nodes before key revocation and renewal.
MDA-Based Modeling and Implementation of E-Commerce Web Applications in WebML
Authors: Guotao Zhuang, Junwei Du
Venue: Proceedings of the 2009 Second International Workshop on Computer Science and Engineering - Volume 02 (2009)

Nowadays E-commerce is one of the most important applications on the Internet. Since E-commerce is a dataintense and complex business processes web application, its development and maintaining is one big challenge. In this paper, we experience a high level modeling method in WebML base on MDA to implement a simplified E-commerce web application which is a PC online shopping. The experimental results show this development method can effectively simplify the development processing and maintenance with less time and cost.
Analysis on the diversity-multiplexing tradeoff for ordered MIMO SIC receivers
Authors: Hongyuan Zhang, Huaiyu Dai, Brian L. Hughes
Venue: IEEE Transactions on Communications (2009)

The diversity-multiplexing tradeoff for multiple-input multiple-output (MIMO) point-to-point channels and multiple access channels were first proposed and studied by Zheng and Tse recently. While the optimal tradeoff curves for MIMO channels have been explicitly explored, those corresponding to some suboptimal and practical MIMO schemes are still open. One such important problem is the diversity-multiplexing trade-off for a V-BLAST type system employing ordered successive interference cancellation (SIC) receivers with zero forcing (ZF) or minimum mean square error (MMSE) processing at each stage. In this paper, we take a novel geometrical approach and rigorously verify that under general settings, the optimal ordering rule for a V-BLAST SIC receiver will not improve its performance regarding diversity-multiplexing tradeoff in point-to-point channels. The same geometrical tool is then applied to MIMO spatial-division multiple access channels, leading to some first results in this area. Particularly, we reveal that when the rates of data streams are fixed (i.e., zero spatial multiplexing gain), the diversity order is not improved by user ordering.
Achieving log-utility fairness in cdma systems via majorization theory
Authors: Chi Wan Sung
Venue: IEEE Communications Letters (2009)

The log-utility fairness problem in CDMA systems is tackled by a new technique - the theory of majorization. Showing that the objective function is strictly Schur concave, we reduce the dimension of the problem to one. After this reduction, we show that the problem has a monotonic property and thus can be solved efficiently by bisection search.
Designs of control charts with supplementary runs rules
Authors: Sheng Zhang, Zhang Wu
Venue: Computers and Industrial Engineering (2005)

This article studies the designs of the control charts with the supplementary runs rules (zone rules). It also investigates, compares and ranks 15 resultant control charts based on steady-state Average Run Length (ARL) that is evaluated by computer simulation. The in-control ARL"0 values of the charts are made equal to the users' specified value. Numerous insights and new findings have been discovered, including: (1) The optimization technique can considerably improve the performance of the control charts with runs rules; (2) Some combinations of runs rules that exclude the basic Shewhart X@? chart have excellent performance, especially when sample size is small; (3) The relative effectiveness (ranking) of the charts is significantly influenced by the sample size and the required in-control ARL"0, and incorporating the X@? chart with runs rules is effective only when the sample size is small; (4) The steady-state ARL of the charts with runs rules differs from the conventional zero-state ARL to some degree. Finally, the proposed design algorithm and the results of some studies provide the quality practitioners with a systematic approach to design the control charts with runs rules and to predict their performance in a production setting.
The Study of the SIP for the VoIP
Authors: Chung-Hsin Liu, Chun-Lin Lo
Venue: Proceedings of the 2009 Fifth International Joint Conference on INC, IMS and IDC (2009)

In this study, we discussed with the protocol of SIP of VoIP. At first, using NS2 simulation software to analysis, then we researched those entities. Because of the impact of VoIP Quality of Service (QoS) as a major factor is the rate of packet loss. And of the human beings, the discontinuous voice caused by a small amount of packet loss can be tolerated. By using actual VoIP equipment, we observing and measuring the rate of packet loss at the crowded network environment.
Watermarking-Based Authentication with Recovery Mechanism
Authors: Hu Yuping, Guo Guangjun
Venue: Proceedings of the 2009 Second International Workshop on Computer Science and Engineering - Volume 02 (2009)

This paper studied the wavelet transformation based watermarkingtamper detection and recovery scheme. By the property of discrete wavelet transform, we design two watermarks from the low-frequency band and embed the watermarks into the high-frequency bands. One watermark is used for detecting the intentional content modification and indicating the modified location, and antherwatermark is used for recovering the image. The watermark generation and watermark embedding are disposed in the image itself, and the received image authentication needs no information about the original image or watermark, so it will increase the security of watermark and prevent forged watermark. Experimental results show the algorithm guarantees a good classification for intentional content modification and incidental tampering, localization of content modification area and recovery of image.
LMDQL: link-based and multidimensional query language
Authors: Paulo Caetano Silva, Fábio Santos Souza, Valéria Cesário Times
Venue: Proceeding of the ACM twelfth international workshop on Data warehousing and OLAP (2009)

The current commercial and academic OLAP tools do not process XML data that make use of XLink. To develop OLAP systems for helping in the analysis of such data, this paper proposes an analytical query language, namely LMDQL (Link-based and Multidimensional Query Language). Before presenting LMDQL, a multidimensional data model based on XLink is given. Then, the LMDQL syntax is detailed together with its operators and a discussion on its processor architecture. Finally, a case study based on XBRL Dimensions documents is given. XBRL can be seen as a standard used in the publication of financial data over internet and contains linkbases based on XLink.
Near-capacity three-stage turbo detection of irregular convolutional coded joint sphere-packing modulation and space-time coding
Authors: O. Alamri, J. Wang, S. X. Ng, L.-L. Yang, L. Hanzo
Venue: IEEE Transactions on Communications (2009)

Conventional two-stage turbo-detected schemes typically suffer from a Bit Error Rate (BER) floor, preventing them from achieving infinitesimally low BER values, especially, when the inner coding stage is of non-recursive nature. We circumvent this deficiency by proposing a three-stage turbo-detected Sphere Packing (SP) aided Space-Time Block Coding (STBC) STBC-SP scheme, where a rate-1 recursive inner precoder is employed to avoid having a BER floor. The convergence behaviour of this serially concatenated scheme is investigated with the aid of 3D Extrinsic Information Transfer (EXIT) Charts. Furthermore, the capacity of the STBC-SP scheme is determined and an algorithm is proposed for calculating a tighter upper bound on the maximum achievable bandwidth efficiency, based on the EXIT charts of the STBC-SP demapper. The proposed three-stage turbo-detected scheme operates within about 1.0 dB of the capacity and within 0.5 dB of the maximum achievable bandwidth efficiency limit.
Subcarrier pairing for amplify-and-forward and decode-and-forward OFDM relay links
Authors: Yong Li, Wenbo Wang, Jia Kong, Mugen Peng
Venue: IEEE Communications Letters (2009)

We consider a two-hop relay link in which orthogonal frequency division multiplexing (OFDM) is used on both hops. Under a joint sum-power constraint, our aim is to allocate power over subcarriers on the two hops such that the instantaneous rate of the relay link is maximized. Ordered subcarrier pairing (OSP) has been proposed in the literature to further improve the relay link rate; however, the optimality of OSP has been proven only for equal power allocation and the proof of its optimality under optimal power allocation has not been available yet. In this letter, we will provide our proof which verifies that OSP is optimal for both amplify-and-forward (AF) and decode-and-forward (DF) relay links when optimal power allocation is applied.
Multiple Faces Detection Through Facial Features and Modified Bayesian Classifier
Authors: Xu Yan, Xiao-Wei Chen
Venue: Proceedings of the 2009 International Conference on Multimedia Information Networking and Security - Volume 01 (2009)

A new multiple faces detection method based on facial features is proposed, which gets the face candidates with the help of skin color and makes use of wavelet express of images and the Principal Component Analysis (PCA) to obtain the eigenvectors distinguishing faces and non-faces, and modifies Bayesian classifier to detect multiple faces of input images. ω, the parameter of the modified rules, could control detection accuracy and error rate to be applied to different application by setting its different values.In addition, after classification, a mosaic template is used to exclude fake faces to ensure high accuracy and low error probability.
A TSAR model for daily evapotranspiration at broad spatial scales: A case study in Northern China
Authors: Yunhao Chen, Xiaobing Li, Jing Li
Venue: Computers Geosciences (2006)

It is technically difficult to estimate the evapotranspiration over a large area due to variation of the effect of canopy microclimate on vegetation and soil processes. In this study, an approach is developed to model daily evapotranspiration from the canopy layer and soil surface of large areas by combining remotely sensed data and ground-based meteorological variables. Combined with vegetation fraction data, a two-layer soil-vegetation atmosphere resistance (TSAR) model for the estimation of regional daily evapotranspiration is derived. A case study in Northern China shows that this model requires less ground information and is much simpler computationally than previous methods, while maintaining reasonably accurate results. The variation and characteristics of evapotranspiration over Northern China are also discussed.
Research on Fuzzy Evaluation in Coal Enterprises Logistic System
Authors: Xu Jun
Venue: Proceedings of the 2009 Second International Workshop on Computer Science and Engineering - Volume 01 (2009)

According to the logistic system current situation of coal enterprises, a practical evaluation index system for its logistic system was established, constructing fuzzy comprehensive evaluation model, with this model, exiting logistic system of one coal enterprise was evaluated as a whole, the result provides scientific evidences for coal enterprises to find out logistic system running situation, find out its insufficient and improve.
ReCap: a tool for automated capture and generation of synchronized audio, PowerPoint and digital ink presentation
Authors: Chan Kin Kong, Jogesh K. Muppala
Venue: Proceedings of the 10th IASTED International Conference on Computers and Advanced Technology in Education (2007)

In this paper we present ReCap, a tool for automated capture and creation of synchronized audio, PowerPoint and digital ink presentation in Real media format. Our tool creates the presentation based on the capture of a classroom lecture in real-time. Our tool is built using several technologies including .Net framework, Microsoft.Ink, ActiveX, SMIL and RealPix. While the tool can be used on any standard PC running Windows with .Net 1.1 framework, the use and capture of digital ink requires a Tablet PC. Recorded presentations are then made available through a podcast which students can subscribe using any podcast receiver. A slide level and pen stroke level indexed presentation is also supported on any browser supporting Active X, like Internet Explorer. By avoiding full-fledged video capture, file sizes are significantly reduced, typically requiring only about 10 Mb for a one-hour lecture. Another salient feature of our tool is that it requires no post-processing to create the synchronized media, thus saving significant post-production effort. ReCap requires minimal hardware support: a windows-based PC with sound recording capability for capturing the lecture dynamics, and a web server with PHP support. The system has been extensively used by the authors in the classroom and has received positive feedback from the students.
A hybrid approach of genetic algorithms and local optimizers in cell loading
Authors: Gürsel A. Süer, Ramon Vazquez, Miguel Cortes
Venue: Computers and Industrial Engineering (2005)

In this paper, the potential application of genetic algorithms to cell loading is discussed. The objective is to minimize the number of tardy jobs. Three different approaches are proposed and later compared. The first approach consists of two steps where (1) genetic algorithms is used to generate a job sequence and (2) a classical scheduling rule is used to assign jobs to the cells. The second approach consists of three steps where steps 1 and 2 are identical to the first approach plus step (3) Local Optimizer is applied to each cell independently. The third approach is very similar to the second approach except that chromosomes are modified to reflect the changes due to learning with local optimizer. Experimentation results show that the number of cells and the crossover strategy adapted affect the number of tardy jobs found. The results also indicate that hybrid GA-local optimizer approach improves the solution quality drastically. However, it has been also shown that GA alone can duplicate the performance of the hybrid approach with increased population size and number of generations in some of the cases. Finally, the impact of learning on the solution quality was not as significant as expected.
Data Hiding in Images by Hybrid LSB Substitution
Authors: Chin-Chen Chang, Hsien-Wen Tseng
Venue: Proceedings of the 2009 Third International Conference on Multimedia and Ubiquitous Engineering (2009)

In this paper, two hybrid LSB substitution image hiding methods are proposed. The first method couples two previous works, the optimal LSB substitution and the optimal pixel adjustment process (OPAP), to improve the quality of the stego-image. The second method is a variation of the first one. It replaces the optimal LSB substitution with the worst LSB substitution. Based on the collaboration technologies, better stego-image quality can be achieved. Experimental results also show that the proposed methods are superior to previous works.
Domain-specific sentiment analysis using contextual feature generation
Authors: Yoonjung Choi, Youngho Kim, Sung-Hyon Myaeng
Venue: Proceeding of the 1st international CIKM workshop on Topic-sentiment analysis for mass opinion (2009)

This paper presents a novel framework for sentiment analysis, which exploits sentiment topic information for generating context-driven features. Since the domain-specific nature of sentiment classification led the task more problematic, considering more contextual-information such as topic or domain is essential. In our system, we first automatically extract sentiment clues in different domains by our observation. We identified that a sentiment clue is often syntactically related to a sentiment topic in a sentence, which is defined as a primary subject of sentiment expression, such as event, company, and person. We bootstrap from a small set of seed clues and generate new clues by utilizing linguistic dependencies and collocation information between sentiment clues and sentiment topics. Next, we learn a domain-specific sentiment classifier for each domain with the newly aggregated clues. We ran experiments to see how the bootstrapping algorithm to converge and aggregate new clues and verified that the extracted domain-context features are more effective than generally-used features in sentiment analysis by running them on the same sentiment classifier.
Optimization and Implementation of Speech Codec Based on Symmetric Multi-processor Platform
Authors: Ouyang Kun, Ouyang Qing, Li Zhitang, Zhou Zhengda
Venue: Proceedings of the 2009 International Conference on Multimedia Information Networking and Security - Volume 02 (2009)

This paper proposes an efficient implementation scheme of the speech codec based on the embedded symmetric multiprocessor data signal processing platform. The base codec uses the G.729 algorithm. To satisfy the requirements of real time applications for efficient processing both audio and video simultaneously on multi-channels, this paper present some implementation techniques to optimize the speech coder. To exploit the characteristics of the embedded symmetric multiprocessor platform, we propose a coarse-grained functional partitioning method to balance the load of the encoder among the cores with small overhead of synchronization. In order to reduce the computational burdens, we propose a fast voice activity detection method. The experimental results show that the proposed scheme improves the performance of the speech codec greatly in terms of computational complexity.
A lightweight network repair scheme for data collection applications in ZigBee WSNs
Authors: Meng-Shiuan Pan, Yu-Chee Tseng
Venue: IEEE Communications Letters (2009)

Data collection is a fundamental operation in wireless sensor networks (WSNs). In [4], a quick convergecast solution is proposed for data collection in a ZigBee beacon-enabled tree-based WSN. However, it does not consider the network repair issue. When a ZigBee router loses its link to its parent, all its descendants have to rejoin the network. The rejoining procedure is time-consuming and may incur high communication overheads. The proposed network repair scheme consists of a regular repair and an instant repair schemes. Periodically, the network coordinator can issue regular repair to refresh the network (so as to keep the network in good shape). During normal operations, if a router loses its parent, it tries instant repair to reconnect to a new parent. Our design thus improves over ZigBee in that nodes can continue their operations even during instant repair.
Iterative MAP equalization and decoding in wireless mobile coded OFDM
Authors: Daniel N. Liu, Michael P. Fitz
Venue: IEEE Transactions on Communications (2009)

Orthogonal frequency division multiplexing (OFDM) system suffers extra performance degradation in fast fading channels due to intercarrier interference (ICI). Combining frequency domain equalization and bit-interleaved coded modulation (BICM), the iterative receiver is able to harvest both temporal and frequency diversity. Realizing that ICI channels are intrinsically ISI channels, this paper proposes a soft-in soft-out (SISO) maximum a posteriori (MAP) equalizer by extending Ungerboeck's maximum likelihood sequence estimator (MLSE) formulation to ICI channels. The SISO MAP equalizer employs BCJR algorithm and computes the bit log-likelihood ratios (LLR) for the entire received sequence by efficiently constructing a trellis that takes into account of the ICI channel structure. A reduced state (RS) formulation of the SISO MAP equalizer which provides good performance/complexity tradeoff is also described. Utilizing the fact that ICI energy is clustered in adjacent subcarriers, frequency domain equalization is made localized. This paper further proposes two computational efficient linear minimum mean square error (LMMSE) based equalization methods: recursive q-tap SIC-LMMSE equalizer and recursive Sliding-Window (SW) SIC-LMMSE equalizer respectively. Simulations results demonstrate that the iterative SISO RS-MAP equalizer achieves the performance of no ICI with normalized Doppler frequency fdTs up to 20.46% in realistic mobile WiMAX environment.
pygrametl: a powerful programming framework for extract-transform-load programmers
Authors: Christian Thomsen, Torben Bach Pedersen
Venue: Proceeding of the ACM twelfth international workshop on Data warehousing and OLAP (2009)

Extract-Transform-Load (ETL) processes are used for extracting data, transforming it and loading it into data warehouses (DWs). Many tools for creating ETL processes exist. The dominating tools all use graphical user interfaces (GUIs) where the developer visually defines the data flow and operations. In this paper, we challenge this approach and propose to do ETL programming by writing code. To make the programming easy, we present the (Python-based) framework pygrametl which offers commonly used functionality for ETL development. By using the framework, the developer can efficiently create effective ETL solutions from which the full power of programming can be exploited. Our experiments show that when pygrametl is used, both the development time and running time are short when compared to an existing GUI-based tool.
Asymptotic critical transmission radii for greedy forward routing in wireless ad hoc networks
Authors: Peng-Jun Wan, Chih-Wei Yi, Lixin Wang, Frances Yao, Xiaohua Jia
Venue: IEEE Transactions on Communications (2009)

In wireless ad hoc networks, greedy forward routing is a localized geographic routing algorithm in which one node discards a packet if none of its neighbors is closer to the destination of the packet than itself, or otherwise forwards the packet to the neighbor closest to the destination. If all nodes have the same transmission radii, the critical transmission radius for greedy forward routing is the smallest transmission radius which ensures packets can be delivered by greedy forward routing through any source-destination pair. In this paper, we study asymptotic critical transmission radii of randomly deployed wireless ad hoc networks. Assume network nodes are represented by a Poisson point process of density n over a unit-area convex compact region whose boundary curvature is bounded. We show that the ratio of critical transmission radii to √lnn/πn is asymptotically almost surely equal to √1/(2/3 - √3/2π) ≅ 1.6.