ppxscal/embedding_network huggingface dataset:
Using an ant colony metaheuristic to optimize automatic word segmentation for ancient Greek
Authors: George Tambouratzis
Venue: IEEE Transactions on Evolutionary Computation (2009)

Given a text or collection of texts involving unconstrained language, a basic task in a multitude of applications is the identification of stems and endings for each word form, which is termed morphological analysis. In this paper, the use of an ant colony optimization (ACO) metaheuristic is proposed for a linguistic task that involves the automated morphological segmentation of Ancient Greek word forms into stem and ending. The task of morphological analysis is essential for implementing text-processing applications such as semantic analysis and information retrieval. The difficulty of the morphological analysis task differs depending on the language chosen, being hardest in the case of highly-inflectional languages, where each stem may be associated with a large number of different endings. In this paper, focus is placed on the morphological analysis of Ancient Greek, which has been shown to be a particularly hard task. To perform this task, a system for the automated morphological processing has been proposed, which implements the morphological analysis of words by coupling an iterative pattern-recognition algorithm with a modest amount of linguistic knowledge, expressed via a set of interactions associated with weights. In an earlier version of the system, these weights were determined by combining the input from specialized scientists with a lengthy manual optimization process. In this paper, the ACO metaheuristic is applied to the task of defining near-optimal system weights using an automated process based on a set of training data. The experiments performed indicate that the segmentation quality achieved by ACO is equivalent to or in several cases substantially higher than that achieved using manually optimized weights.
Delay uncertainty reduction by gate splitting
Authors: Vineet Agarwal, Jin Sun, Janet M. Wang
Venue: IEEE Transactions on Circuits and Systems II: Express Briefs (2009)

Traditional timing-variation reduction techniques are only able to decrease gate delay variation by incurring a delay overhead. In this brief, we propose a novel and effective splitting-based variation reduction technique for gates. We developed a new tool called Timing Uncertainty Reduction by Gate Splitting (TURGS), which reduces the timing variations of a circuit and presents little delay overhead at the primary output. Our experimental results show that TURGS achieves up to 20% improvement in timing variation for gates.
Characterization of Bluetooth packet delay in noisy environments
Authors: M. J. Morón, R. Luque, E. Casilari, A. Díaz-Estrella
Venue: IEEE Communications Letters (2009)

This letter presents an analytical model to compute the delay of Bluetooth transmissions with Serial Port Profile (SPP) when interferences cause packet retransmissions. In particular, the model takes into consideration the overhead and segmentation introduced by the protocol stack as well as the extra delay provoked by the retransmissions. The model is empirically validated through the measurements of actual Bluetooth connections.
Simulation of source-specific multicast used in large-scale IPTV broadcasting
Authors: Dan Komosny, Radim Burget, Vit Notovny
Venue: Proceedings of the IASTED Asian Conference on Modelling and Simulation (2007)

ASM (Any Source Multicast) and SSM (Source-Specific Multicast) are the two types of multicast used in IP-based networks. SSM is expected to cover all types of multimedia sessions with many receivers and only one source, such as IPTV broadcasting. The paper describes simulation tools for IPTV broadcasting systems with millions of subscribes. These numbers of receivers are expected when the IPTV technology will is available and affordable for the majority of TV stations. The aim of these simulations is to estimate the whole communication system behaviour, in particular the time requirements to transmit the feedback information from receivers to the source. The feedback from receivers is used by the media source, for example, for the parameterization of a multicast forward error correction (FEC) algorithm or the tuning of audio suppression algorithms. The feedback transmitted usually contains information about the synchronization of transmitted media (audio, video), packet loss, packet delays, and jitter. The simulation tools presented below are an SSM multicast model developed in SDL (Specification and Description Language) and an IPTV client/server application, which allows creating virtual clients to obtain the required number of receivers.
Customer Value Analysis Based on the Combination of Rough Set and Decision Tree
Authors: Wei-jun Wen
Venue: Proceedings of the 2009 Second International Workshop on Computer Science and Engineering - Volume 02 (2009)

In this paper, considering customer value characteristic, an analysis system based on rough sets theory and decision tree is proposed. The degree of dependency of decision attribute to condition attribute, based on rough sets theory, is used as a heuristic in decision tree for selecting the attribute that will best separate the samples into individual classes. Customer value analysis system is introduced to verify the feasibility and necessity of above method.
The design of web-based cooperative learning system for operating 3D virtual instruments
Authors: Fu-Chien Kao, Da-Wei Lin, Chang-Yu Huang, Kun-Yi Chiang
Venue: Proceedings of the 10th IASTED International Conference on Computers and Advanced Technology in Education (2007)

Recently, the academic community has been giving much attention to Cooperative Learning System, a group learning method combined with pedagogy and social psychology. It allows group members to gain knowledge through collaborations and interactions. Nowadays, most Internet cooperative learning systems are designed to provide students mainly with a convenient online environment to study theoretical courses but rarely with a 3D virtual reality to operate practical instruments. Hence, this paper designed a 3D online cooperative learning system for operating virtual instruments. By integrating with Virtual Reality, Remote Control Parameter Transmission and PC Broker techniques, this system gives learners not only a cooperative learning environment via networking to jointly operate the 3D virtual instruments (for example, multi-meters, power supplies and oscilloscopes) but also the functions of instant messages and 3D puzzles to interact with one another. Therefore, learners can effectively improve learning interests and results.
Reliability-based retransmission criteria for hybrid ARQ
Authors: Justus Ch. Fricke, Peter A. Hoeher
Venue: IEEE Transactions on Communications (2009)

Bit error probability (BEP) and word error probability (WEP) are used as reliability-based retransmission criteria in conjunction with hybrid ARQ (HARQ) protocols. Instead of exploiting an error-detecting code, the decision for a retransmission is based on the error probability of the decoded word, which can be calculated in or after the decoding process.
Fast multiple-symbol detection for free-space optical communications
Authors: Michael L. B. Riediger, Robert Schober, Lutz Lampe
Venue: IEEE Transactions on Communications (2009)

In this paper, we investigate noncoherent detection, i.e. detection assuming the absence of channel state information at the receiver, of on-off keying in an intensity modulation and direct detection (IM/DD) free-space optical (FSO) system. To partially recover the performance loss associated with symbol-by-symbol noncoherent detection, we consider the application of multiple-symbol detection (MSD), in which block-wise decisions are made using an observation window of several bit intervals. Specifically, we develop a fast search algorithm for optimal MSD and propose a reduced-complexity decision metric suitable for suboptimal MSD; performance results confirm that the optimal and suboptimal metrics perform comparably well. Significantly, the complexity of our receiver, on a per bit-decision basis, is only logarithmically dependent on the observation window size. We also present the framework for a decision-feedback receiver and obtain performance expressions for the ideal case of error-free feedback; these expressions serve as an upper bound to the performance of MSD. Analytical and simulation results indicate that as the observation window size increases, the performance of the MSD receiver approaches that of detection with channel state information. The conclusion is reached that the proposed implementation provides an attractive low-complexity mechanism for performing noncoherent MSD in FSO systems.
A flexible rate Slepian-Wolf code construction
Authors: Mahdi Zamani, Farshad Lahouti
Venue: IEEE Transactions on Communications (2009)

A flexible rate Slepian-Wolf (SW) code is constructed, which is vital for wireless sensor network applications. The proposed solution is based on an efficient and practical algorithm to compute the syndrome of the rate-compatible convolutional codes (RCPC). Using this algorithm, there is no need to compute the syndrome of punctured version of the mother code for each puncturing matrix, which is complex. Instead, the syndrome of the punctured code is the punctured version of the syndrome of the mother code using the same pattern of puncturing. The algorithm is general for all convolutional codes in Zq. The strategy is also generalized for parallel and serial concatenated convolutional codes. For the cases, where the dependencies among sources are modeled as a virtual discrete channel, a simplified decoding scheme is suggested. This method is generalized to achieve all points on the SW boundary using a simple code design technique. Simulation results demonstrate the performance and effectiveness of the proposed methods.
The P2P Wireless Network Applied in Real-Time Vehicle Navigation
Authors: Yuefeng Liu, Xin Zhang, Huabo Sun
Venue: Proceedings of the 2009 Third International Conference on Multimedia and Ubiquitous Engineering (2009)

The real-time vehicle navigation under wireless environment is difficult for practical use due to the bottleneck of the cellular network wireless bandwidth. We applied the P2P wireless network into the real-time vehicle navigation system, and that turns out to be sound in efficient data transfer.The data transfer strategies include data pre-downloading which aims to smooth the navigation map display, the downloading rate maximization which fully utilizes the peers’ resources and the transfer data minimization which we will discuss in our later papers. Further, Experiment is made to validate our analysis.
On the simulation and correlation properties of phase-envelope Nakagami fading processes
Authors: José Cândido Silveira Santos Filho, Michel Daoud Yacoub
Venue: IEEE Transactions on Communications (2009)

The aim of this Letter is twofold: to propose a simulator for both the phase and the envelope of Nakagami fading channels with arbitrary parameters and to derive precise closed-form approximations to the correlation functions of the Nakagami envelope, phase, and quadrature components.
Extracting position relations from the web
Authors: Yanhong Liu, Peiquan Jin, Lihua Yue
Venue: Proceeding of the eleventh international workshop on Web information and data management (2009)

In this paper, we present a new algorithm to extract people's position in a corporation from the Web. People's position in a corporation, which the term position relation refers to, is a kind of significant competitive intelligence for enterprises. Our algorithm is based on the structural feature of position relation in Web contents, i.e., position relation is usually described in Web pages as a table or a list. In order to define the structural feature of Web contents, we first introduce a structural coefficient for each Web page. This structural coefficient is then used to generate structural file segments from Web pages. A structural file segment consists of all the candidates of position relation with a similar structure. We then employ a pattern-matching method to extract position relations from the structural file segments. Finally, we conduct experiments on a real data set containing 6028 Chinese Web pages gathered through the Baidu search engine, and evaluate the precision and recall of our approach. The experimental results show that our algorithm has a high precision over 96% as well as a recall over 87%.
The augmented state diagram and its application to convolutional and turbo codes
Authors: Ioannis Chatzigeorgiou, Miguel R. D. Rodrigues, Ian J. Wassell, Rolando A. Carrasco
Venue: IEEE Transactions on Communications (2009)

Convolutional block codes, which are commonly used as constituent codes in turbo code configurations, accept a block of information bits as input rather than a continuous stream of bits. In this paper, we propose a technique for the calculation of the transfer function of convolutional block codes, both punctured and nonpunctured. The novelty of our approach lies in the augmentation of the conventional state diagram, which allows the enumeration of all codeword sequences of a convolutional block code. In the case of a turbo code, we can readily calculate an upper bound to its bit error rate performance if the transfer function of each constituent convolutional block code has been obtained. The bound gives an accurate estimate of the error floor of the turbo code and, consequently, our method provides a useful analytical tool for determining constituent codes or identifying puncturing patterns that improve the bit error rate performance of a turbo code, at high signal-to-noise ratios.
A robust pair-wise rekeying protocol in hierarchical wireless sensor networks
Authors: An-Ni Shen, Song Guo
Venue: Proceedings of the 5th international student workshop on Emerging networking experiments and technologies (2009)

To support secure communications for many applications in wireless sensor networks (WSNs), some strategies have been proposed to develop the pair-wise rekeying protocol. However, most existing schemes suffer the node capture attack. In this paper, we present a perturbation-based pair-wise rekeying scheme for a hierarchical WSN. Our security analysis shows that the proposed scheme is robust to the node capture attack.
Propagation Model of Non-scanning Active Worm in Unstructured P2P Network
Authors: Hua Li, Zheng Qin, Xiaohui Pan, Xiaosong Zhang
Venue: Proceedings of the 2009 International Conference on Multimedia Information Networking and Security - Volume 02 (2009)

Nowadays, P2P network has been used by millions of internet subscribers because of its convenience in sharing and exchanging files. But non-scanning active worms which propagation by making use of the topology of the P2P network make P2P network facing heavy threaten. This kind of worms can propagate much faster than non-P2P worms since they needn't waste time for randomly searching for attack targets and can cause much more harm to network. So in this paper we study the propagation of this kind of worms in unstructured P2P network, propose a new non-scanning active worm propagation model and describe the impact of the related parameters, such as the size of the P2P network, the size of the hit list etc, on the propagation speed of the non-scanning active worm. We believe our model can be a guideline in the defense and control of non-scanning active worm propagation in unstructured P2P network to some extent
Modified model for settling behavior of operational amplifiers in nanoscale CMOS
Authors: Hamidreza Rezaee-Dehsorkh, Nassim Ravanshad, Reza Lotfi, Khalil Mafinezhad
Venue: IEEE Transactions on Circuits and Systems II: Express Briefs (2009)

An accurate time-domain model for the settling behavior of folded-cascode operational amplifiers is presented. Using a velocity-saturation model for MOS transistors makes the proposed model suitable for nanoscale CMOS technologies. Both linear and nonlinear settling regimes and their combination are considered. Transistor-level HSPICE simulation results of a fully differential single-stage folded-cascode amplifier using BSIM4v3 models of a standard 90-nm CMOS process are presented to verify the accuracy of the proposed models.
A BLP-Based Model for Hierarchical Orgnizations
Authors: Jue Wang, Li Zhou, Chengxiang Tan
Venue: Proceedings of the 2009 Second International Workshop on Computer Science and Engineering - Volume 01 (2009)

A model based on Bell-LaPadula model is proposed for access control in hierarchical organizations which have hierarchical units. These units include departments, staff and a new concept named post. In the model proposed by this paper, relationships among units in organization are built, and security tags can be assigned to subjects and objects simply. The interoperation among different departments is implemented through assigning multiple security tags to one post, and the more departments are closed on the organization tree, the more secret objects can be exchanged by the staff of the departments. The access control matrices of the department, post and staff are defined. By using the three access control matrices, a multi granularity and flexible discretionary access control policy is implemented. The outstanding merit of the BLP model is inherited, and the new model can guarantee that all the information flow is under control. Finally, the study shows that the proposed model is more flexible.
A Distributed Network Management Framework Based on Mobile Agents
Authors: FuLiang Guo, Bin Zeng, LiangZhong Cui
Venue: Proceedings of the 2009 Third International Conference on Multimedia and Ubiquitous Engineering (2009)

Traditional approaches to network management are mostly based on the centralized client/server model. Due to the intrinsic limitations of SNMP-based management paradigms, such as information bottlenecks and lack of flexibility, have encouraged a trend towards distributed management system. The emergence of mobile agent frameworks has led many researchers to examine their applicability to network management and control environments. It is believed that mobile agents can provide better solutions at least to performance and fault management problems. In this paper, the fundamental architecture of distributed network management using mobile agents is presented. We also discuss its advantages and how to develop mobile agents using Grasshopper agent platform. Finally, an example of management application implementation based on our framework is briefly described.
A CAPTCHA Implementation Based on 3D Animation
Authors: Jing-Song Cui, Jing-Ting Mei, Xia Wang, Da Zhang, Wu-Zhou Zhang
Venue: Proceedings of the 2009 International Conference on Multimedia Information Networking and Security - Volume 02 (2009)

In order to distinguish between human users and computer programs, CAPTCHA (Completely Automated Public Turing test to tell Computers and Human Apart) mechanism is widely applied in websites such as accounts application website. While the major implementation of CAPTCHA method—2D still image verification code based on OCR technology is threatened by developing artificial intelligence and image recognition technologies. In this paper, we propose a new approach to implement CAPTCHA mechanism based on 3D Animation, utilizing the weakness of computer vision, which make it robust to computer attacks and convenient for users to recognize, and implemented this method to generate a 3D animation verification code.
Using SDI and web-based system to facilitate disaster management
Authors: A. Mansourian, A. Rajabifard, M. J. Valadan Zoej, I. Williamson
Venue: Computers Geosciences (2006)

Spatial data and related technologies have proven to be crucial for effective collaborative decision-making in disaster management. However, there are currently substantial problems with availability, access and usage of reliable, up-to-date and accurate data for disaster management. This is a very important aspect to disaster response as timely, up-to-date and accurate spatial data describing the current situation is paramount to successfully responding to an emergency. This includes information about available resources, access to roads and damaged areas, required resources and required disaster response operations that should be available and accessible for use in a short period of time. Any problem or delay in data collection, access, usage and dissemination has negative impacts on the quality of decision-making and hence the quality of disaster response. Therefore, it is necessary to utilize appropriate frameworks and technologies to resolve current spatial data problems for disaster management. This paper aims to address the role of Spatial Data Infrastructure (SDI) as a framework for the development of a web-based system as a tool for facilitating disaster management by resolving current problems with spatial data. It is argued that the design and implementation of an SDI model and consideration of SDI development factors and issues, together with development of a web-based GIS, can assist disaster management agencies to improve the quality of their decision-making and increase efficiency and effectiveness in all levels of disaster management activities. The paper is based on an ongoing research project on the development of an SDI conceptual model and a prototype web-based system which can facilitate sharing, access and usage of spatial data in disaster management, particularly disaster response.
A Study on Motive and Behavior of Corporate Donations in Yangtze River Delta
Authors: Xueying Tian
Venue: Proceedings of the 2009 Second International Symposium on Knowledge Acquisition and Modeling - Volume 02 (2009)

In recent years, as an important form of corporate social responsibility, the phenomenon of corporate donations comes forth rapidly. For the purpose of exploring characteristics of corporate donations, the research used data from 290 enterprises in Yangtze River delta of China involved in contribution between 2004 and 2006. Based on the factor analysis and descriptive statistics, the results are as follows: (1) the motive of corporate donations can be classified into three kinds: public welfare, short-term business interest and long-term mutual benefit; (2) the average annual amount of corporate donations takes on a trend of “the middle is high, while both sides are low”; (3) the fields of corporate donations cover a wide range and are more related to the industry. Foreign enterprises generally are better than domestic ones in donation tactic.
High rate CPFSK space-time trellis codes
Authors: Rachel L. Maw, Desmond P. Taylor
Venue: IEEE Transactions on Communications (2009)

Space-time trellis coding is an established diversity technique that reduces the effects of multipath fading over wireless communication channels. Here, we consider high rate space-time trellis codes (STTC) with continuous phase frequency shift keying (CPFSK). We present optimized rate- 2/3 STTC implemented with 3 transmit antennas. These codes provide system throughputs of 4 and 6 bits per channel use with 4-ary and 8-ary CPFSK respectively. Simulated error rate performance of the optimized codes with receive diversity is presented. We show that although the schemes do not achieve full transmit diversity, they provide excellent coding gains compared to full rank schemes that have equivalent throughput, but higher order modulations and greater complexity.
On a Model of Internet Topology Structure
Authors: Ye Xu, Zhuo Wang
Venue: Proceedings of the 2009 International Conference on Multimedia Information Networking and Security - Volume 01 (2009)

On the basis of power-law approaches such as the frequency-degree, degree-rank, Internet topology modeling was studied and obvious power-law properties together with corresponding power exponents depicting characters of Internet topology structure were found. Then, an improvement of BA model was started to better charactering Internet topology by means of an optimization procedure with respect to the upper-mentioned power exponents.