ppxscal/embedding_network huggingface dataset:
A Decision Model for Benchmarking Knowledge Management Practices
Authors: Hepu Deng
Venue: Proceedings of the International Conference on Computational Inteligence for Modelling Control and Automation and International Conference on Intelligent Agents Web Technologies and International Commerce (2006)

This paper presents a decision model for benchmarking and evaluating organizational knowledge management (KM) practices. Linguistic variables approximated by fuzzy numbers are used for adequately handling the subjectiveness and imprecision of the evaluation process. Pairwise comparison is adopted in the evaluation process for greatly reducing the cognitive burden of the decision maker. A fuzzy multicriteria analysis algorithm is developed for generating an overall ranking of all the organizations regarding their KM practices. As a result, the relative performance of organizations in managing their knowledge can be properly assessed, and effective decisions can be made for further improving their KM practices. An empirical study in evaluating the KM practices at Victorian local governments in Australia is presented for demonstrating the applicability of the proposed decision model in real situations.
Using Computational Methods to Reinvigorate an Undergraduate Physics Curriculum
Authors: Jaime R. Taylor, B. Alex King III
Venue: Computing in Science and Engineering (2006)

The increased importance of computational methods in physics has made it a must-have skill forundergraduate physics majors. The Austin Peay State University (APSU) Department of Physics and Astronomyhas recently reinvigorated its program with the help of the Department of Mathematics by adding smallcomputational components to classes across our curricula, as well as adding a single, requiredComputational Methods class to the physics major. In addition, we now emphasize a front-to-back problemmanagement approach within our classes; this has required a significant change in the way in which weassess our students performance.
An Event-Related fMRI Investigation of Implicit Semantic Priming
Authors: Jesse Rissman, James C. Eliassen, Sheila E. Blumstein
Venue: Journal of Cognitive Neuroscience (2003)

The neural basis underlying implicit semantic priming was investigated using event-related fMRI. Prime-target pairs were presented auditorily for lexical decision (LD) on the target stimulus, which was either semantically related or unrelated to the prime, or was a nonword. A tone task was also administered as a control. Behaviorally, all participants demonstrated semantic priming in the LD task. fMRI results showed that for all three conditions of the LD task, activation was seen in the superior temporal gyrus (STG), the middle temporal gyrus (MTG), and the inferior parietal lobe, with greater activation in the unrelated and nonword conditions than in the related condition. Direct comparisons of the related and unrelated conditions revealed foci in the left STG, left precentral gyrus, left and right MTGs, and right caudate, exhibiting significantly lower activation levels in the related condition. The reduced activity in the temporal lobe suggests that the perception of the prime word activates a lexical-semantic network that shares common elements with the target word, and, thus, the target can be recognized with enhanced neural efficiency. The frontal lobe reductions most likely reflect the increased efficiency in monitoring the activation of lexical representations in the temporal lobe, making a decision, and planning the appropriate motor response.
A performance analysis of robust constrained beamforming with random errors
Authors: D. D. Feldman, L. J. Griffiths
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1993. ICASSP-93 Vol 4., 1993 IEEE International Conference on - Volume 04 (1993)

Two causes of performance degradation in linearly constrained minimum variance beamforming are perturbation error and sample covariance estimation error. These causes were discussed by the authors (1991), who proposed an approach, termed the projection method, to reduce the sensitivity of the beamformer performance to both types of error. An analysis is given of the expected performance of the beamformer when it is implemented either with or without using the projection method. Based on a second order Taylor series expansion of an approximate expression for the signal to interference-plus-noise ratio (SINR) at the beamformer output, the analysis provides accurate results when either perturbation errors or sample covariance errors occur. A less accurate analysis based on a zeroth order Taylor series expansion is found to include results presented by N.K. Jablon (1986) and L. Chang and C. Yeh (1993) as special cases.
Augmented Learning: Context-Aware Mobile Augmented Reality Architecture for Learning
Authors: Jayfus T. Doswell
Venue: Proceedings of the Sixth IEEE International Conference on Advanced Learning Technologies (2006)

Mobile Augmented Reality System (MARS) based elearning environments equip a learner with a mobile wearable see-through display that interacts with training/learning software. MARS has the potential to adapmt to individual learner needs and dynamically distribute tailored instruction to improve learning performance for a life time. While using MARS, learners may interact with their natural environment while MARS digitally annotates real-world objects with digital content. This digital content may combine multi-modal animation, graphics, text, and video as well as voice used to augment instruction based on empirical pedagogical models. The challenge, however, is building a MARS software architecture that fulfills this potential and is also reusable, interoperable, and adaptive to individual Augmented Reality (AR) "heads-up displays" while, at the same time, capable of delivering personalized instruction to the learner.
Spares optimization for the Lockheed Martin Joint Strike Fighter
Authors: Jean-Paul Watson, Michael Collins, William Hart, Hai Le, Laura Swiler, Bruce Thompson
Venue: Proceedings of the 36th conference on Winter simulation (2004)

Over the next few decades, the Lockheed Martin Joint Strike Fighter will supplant existing aircraft in various branches of US and NATO armed forces. A major deployment challenge is the identification of low-cost, high-performance sparing policies and resource allocations across geographically dispersed supply and repair chains. Through a joint effort, Sandia National Laboratories and Lockheed Martin have developed a detailed enterprise-level discrete events simulation of the complete operation. Optimization in the context of this simulator is exceptionally challenging: the number of free parameters numbers in the hundreds of millions, while individual simulations require hours of runtime. We will describe the architecture and algorithms forming the basis of a software system that leverages a careful balance of simulation output analysis, heuristics, mixedinteger programs, and local search to achieve low-cost, high-quality sparing policies and resource allocations for the full-scale distribution network.
From Macedonia to Mauritius: New Trajectories in Wireless Broadband Development
Authors: Bojan Angelov, Bharat Rao
Venue: Proceedings of the International Conference on Mobile Business (2006)

In the developed world, broad technological dominance and advances in infrastructure deployment have led to commoditized Internet access. In parallel to these trends, two developing countries from different parts of the world are making history by deploying 'state of the art' nationwide wireless broadband networks. These two nations, Macedonia and Mauritius, had nothing in common, but since early 2006, both of them will provide their citizens ubiquitous wireless Internet access. Since they will be the first countries in the world to deploy wireless networks at this scale, we seek to analyze the commonalities and differences between technology strategy, government policy choices, public and private institutions, informal citizen networks, and the broader socio-economic impacts of such deployments. In this paper, we describe how these two trajectories are novel, yet significantly different, with a potential for effecting unique types of change.
The Research and Realization of a New Workflow Model with Step-Task Two Layers Based on Document
Authors: Lin Zhao, Jianping Xing, Lingguo Meng
Venue: Proceedings of the 2006 IEEE Asia-Pacific Conference on Services Computing (2006)

With the increasing in complexion of large-scale activities in business process, workflow model has been focused on highly than before. In this research, a new workflow model (WfM) with two layers (Step and Task layers) was proposed, which leads to process logic and concrete affairs couple loose, and deals with problems of simple logic of directed graph WfM and complex realization of net structure WfM. With the half structure model, process logic is defined during design, and real tasks route is chosen in practice, which enhances the flexibility of WfM. Besides, the notion, document-driven workflow, was introduced in that WfM. The parsing process of documents, the design format of documents and the delivery technology were also given. In order to accomplish a complete WfM, we integrated WfM and organization model in both static and dynamic ways. Finally we delineate the realization of S-T platform based on that WfM in this paper.
Blind recovery of multiple packets in ad hoc mobile networks using polynomial phase modulating sequences
Authors: M. M. Lara, A. G. Orozco-Lugo, D. C. McLernon, H. J. Muro-Lemus
Venue: Proceedings of the 2003 International Conference on Multimedia and Expo - Volume 1 (2003)

We consider multiple packet reception (MPR) for asynchronous random access wireless mobile ad hoc networks. An interference cancellation algorithm is proposed that exploits the base-band cyclostationarity properties of the signal, which are induced at the transmitters by means of modulating the symbols with distinct polynomial phase sequences. In contrast to the method presented in [A.J. van der Veen and L. tong, 2002], the proposed technique docs not require knowledge of the starting time of transmission of the desired signal and can be applied to dispersive multipath channels. Also a practical way of assigning the modulating sequences via the use of a common codebook known to all nodes is proposed, and the impact on local throughput of such scheme is analyzed.
Long Time Behaviour of Unstable Multilevel Systems in Presence of Zero Energy Resonance
Authors: Manabu Miyamoto
Venue: Open Systems Information Dynamics (2006)

Long time behaviour of the survival probability for unstable multilevel systems is studied based on the N-level Friedrichs model in the presence of zero energy resonance, that means the divergence of the resolvent at zero energy. With resort to the technique developed by Jensen and Kato [Duke Math. J. 46, 583 (1979)], the zero energy resonance of this model is characterized by the zero energy eigenstate that does not belong to the Hilbert space. It is then shown that for some kinds of the form factors, logarithmically slower decay of the survival probability can be realized.
Hospital evacuation: issues and complexities
Authors: Kevin M. Taaffe, Rachel Kohl, D. L. Kimbler
Venue: Proceedings of the 37th conference on Winter simulation (2005)

Hospital evacuation is a difficult process that requires a robust strategy and careful execution. In the past, threats leading to possible evacuation were primarily natural disasters. In recent years the broadened nature of threats, including hazardous material spills and terrorist incidents, has complicated this already complex problem. Its importance continues to grow, but there is still no consistent approach to tackle this problem. Plan development and evaluation are crucial to the plan's refinement which leads to successful response when an evacuation threat occurs. This research describes the issues inherent in planning and evaluation along with the complexities of constructing appropriate models for emergency preparedness and evacuation.
Boundary recognition in sensor networks by topological methods
Authors: Yue Wang, Jie Gao, Joseph S.B. Mitchell
Venue: Proceedings of the 12th annual international conference on Mobile computing and networking (2006)

Wireless sensor networks are tightly associated with the underlying environment in which the sensors are deployed. The global topology of the network is of great importance to both sensor network applications and the implementation of networking functionalities. In this paper we study the problem of topology discovery, in particular, identifying boundaries in a sensor network. Suppose a large number of sensor nodes are scattered in a geometric region, with nearby nodes communicating with each other directly. Our goal is to find the boundary nodes by using only connectivity information. We do not assume any knowledge of the node locations or inter-distances, nor do we enforce that the communication graph follows the unit disk graph model. We propose a simple, distributed algorithm that correctly detects nodes on the boundaries and connects them into meaningful boundary cycles. We obtain as a byproduct the medial axis of the sensor field, which has applications in creating virtual coordinates for routing. We show by extensive simulation that the algorithm gives good results even for networks with low density. We also prove rigorously the correctness of the algorithm for continuous geometric domains.
Time-Frequency Domain Fast Audio Transcoding
Authors: Fu-Shing Ju, Ce-Min Fang
Venue: Proceedings of the Eighth IEEE International Symposium on Multimedia (2006)

Bitrate or format transcoding of digital audio data is extremely important in many different types of applications. Transcoding can be performed via complete decoding and re-encoding, but this entails a very high cost in computing power. In this paper, we propose a transcoding method employing frequency domain signals. This method can dramatically reduce the memory requirement and computing power, that is very suitable for computing and power limited applications, such as multimedia recording and playing in handheld devices.
Adaptive channel assignment in SDMA-based wireless LANs with transceiver resource limitations
Authors: Iordanis Koutsopoulos, Leandros Tassiulas
Venue: Signal Processing (2006)

Beamforming with adaptive antenna arrays is the most promising means for increasing data rates of wireless systems, since it enables channel reuse by several users in a cell through space division multiple access (SDMA). In SDMA, multiple beams are formed towards different users, each beam by a dedicated transceiver. However, the use of adaptive antenna arrays at the physical layer mandates significant modifications for higher layers. Joint consideration of beamforming and higher layer issues is required in order to fully exploit the benefits of SDMA. Moreover, adoption of the popular orthogonal frequency division multiplexing (OFDM) technique creates additional challenges when the number of beams that can be formed at the transmitter is bounded. This issue is attributed to transceiver resource limitations and gives rise to a coupled resource allocation problem, that of assigning transceiver hardware units and OFDM subcarriers for transmission to users. Different users can be served either with the same beam from a transceiver and different subcarriers or with different beams and the same subcarriers. We characterize the problem and propose meaningful heuristic algorithms for beamforming and assignment of subcarriers and transceivers to users. The objective is to increase achievable system rate and ensure QoS in the form of minimum rate guarantees. The criteria for resource assignment and beam formation are based on spatial separability properties of users, beam vector cross-correlations and induced interference. Numerical results quantify the performance benefits of these cross-layer techniques and provide useful insights and design guidelines for realistic systems.
Research on User Authentication for Grid Computing Security
Authors: Ronghui Wu, Renfa Li, Fei Yu, Guangxue Yue, Cheng Xu
Venue: Proceedings of the Second International Conference on Semantics, Knowledge, and Grid (2006)

Recently, Authentication protocol has been recognized as an important factor for grid computing security. This paper described a new simple and efficient Grid authentication system providing user anonymity. Our system is based on hash function, and mobile users only do symmetric encryption and decryption. In our system, it takes only one round of messages exchange between the mobile user and the visited network, and one round of message exchange between the visited network and the corresponding home network. The proposed architecture possesses several desirable emerging properties that enable it to provide an improved level of security for grid computing systems..
Factors affecting assigned information problem ordering during web search: an exploratory study
Authors: Amanda Spink, Minsoo Park, Sherry Koshman
Venue: Information Processing and Management: an International Journal (2006)

Multitasking is the human ability to handle the demands of multiple tasks. Multitasking behavior involves the ordering of multiple tasks and switching between tasks. People often multitask when using information retrieval (IR) technologies as they seek information on more than one information problem over single or multiple search episodes. However, limited studies have examined how people order their information problems, especially during their Web search engine interaction. The aim of our exploratory study was to investigate assigned information problem ordering by forty (40) study participants engaged in Web search. Findings suggest that assigned information problem ordering was influenced by the following factors, including personal interest, problem knowledge, perceived level of information available on the Web, ease of finding information, level of importance and seeking information on information problems in order from general to specific. Personal interest and problem knowledge were the major factors during assigned information problem ordering. Implications of the findings and further research are discussed. The relationship between information problem ordering and gratification theory is an important area for further exploration.
Automated analysis of simulation output data
Authors: Stewart Robinson
Venue: Proceedings of the 37th conference on Winter simulation (2005)

Appropriate analysis of simulation output is important to the success of a simulation study. Many users, however, do not have the skills required to perform such analyses. One way of overcoming this problem is to provide automated tools for analyzing simulation output. An Excel based automated "Analyser" is described that performs an analysis of a single scenario. The Analyser links to a commercial simulation software package, SIMUL8, and provides recommendations on warm-up, number of replications and run-length. Various standard procedures are used in the Analyser with some adaptations to make them suitable for automation. This research demonstrates the potential of the approach. A requirement for further development is more thorough testing of the analysis procedures, particularly for their robustness and generality in use. Further adaptation of the procedures for automation may also be required.
A Cross-Layer (Layer 2 + 3) Handoff Management Protocol for Next-Generation Wireless Systems
Authors: Shantidev Mohanty Ian F. Akyildiz
Venue: IEEE Transactions on Mobile Computing (2006)

Next-generation wireless systems (NGWS) integrate different wireless networks, each of which is optimized for some specific services and coverage area to provide ubiquitous communications to the mobile users. It is an important and challenging issue to support seamless handoff management in this integrated architecture. The existing handoff management protocols are not sufficient to guarantee handoff support that is transparent to the applications in NGWS. In this work, a cross-layer (Layer 2 + 3) handoff management protocol, CHMP, is developed to support seamless intra and intersystem handoff management in NGWS. Cross-layer handoff management protocol uses mobile's speed and handoff signaling delay information to enhance the handoff performance of Mobile IP that is proposed to support mobility management in wireless IP networks. First, the handoff performance of Mobile IP is analyzed with respect to its sensitivity to the link layer (Layer 2) and network layer (Layer 3) parameters. Then, a cross-layer handoff management architecture is developed using the insights learnt from the analysis. Based on this architecture, the detailed design of CHMP is carried out. Finally, extensive simulation experiments are carried out to evaluate the performance of CHMP. The theoretical analysis and simulation results show that CHMP significantly enhances the performance of both intra and intersystem handoffs.
A Hybrid Transform Coding for Video Codec
Authors: M. Ezhilarasan, P. Thambidurai
Venue: Proceedings of the 9th International Conference on Information Technology (2006)

This paper proposes a hybrid transform coding technique, where the intraframes of video sequence are coded by discrete wavelet transform and the interframes are coded with discrete cosine transform technique. It also proposes the selection of sequence of frames predicted from the reference intraframes. This proposal consistently minimizes the prediction error for the predicted frame for further processing. The experimental results show that the proposed hybrid transformation coding technique outperforms over conventional transformation coding technique in terms of encoding time and prediction errors.
Control System Framework for Autonomous Robots Based on Extended State Machines
Authors: Torsten Merz, Piotr Rudol, Mariusz Wzorek
Venue: Proceedings of the International Conference on Autonomic and Autonomous Systems (2006)

We present a new framework optimized for the design, implementation, and testing of control systems for autonomous robots. It is based on a new visual specification language which specifies both control and data flow, and which is suited to be interpreted in real-time. The framework is divided into a comprehensive development and a lightweight run-time environment. The latter is fully integrated with a real-time operating system and permits to reconfigure a control system without compilation at run time. Moreover, communication in distributed systems is supported. An earlier version of the framework has been successfully applied in an autonomous helicopter and an autonomous ground vehicle project.
SiMPE: speech in mobile and pervasive environments
Authors: A. A. Nanavati, N. Rajput, A. I. Rudnicky, R. Sicconi
Venue: Proceedings of the 8th conference on Human-computer interaction with mobile devices and services (2006)

Traditionally, voice-based applications have been accessed using unintelligent telephone devices through Voice Browsers that reside on the server. The proliferation of pervasive devices and the increase in their processing capabilities, client-side speech processing is emerging as a viable alternative. This workshop will explore the various possibilities and issues that arise while enabling speech processing on resource-constrained, possibly mobile devices. The workshop will highlight the many open areas that require research attention, identify key problems that need to be addressed, and also discuss a few approaches for solving some of them - to build the next generation of conversational systems.