ppxscal/embedding_network huggingface dataset:
Optimality of threshold policies for transmission scheduling in correlated fading channels
Authors: Minh Hanh Ngo, Vikram Krishnamurthy
Venue: IEEE Transactions on Communications (2009)

We consider exploiting perfect channel state information for optimal scheduling for point-to-point data transmission over correlated fading wireless channels, where retransmissions are allowed via the use of a channel-aware ARQ protocol. The objective is to achieve a trade-off between energy and packet loss rate subject to a hard delay constraint. Specifically, the aim of the transmission scheduling problem is to minimize the sum of accumulated transmission costs and a penalty cost on the number of lost packets, subject to the constraint that each batch of a finite number of link layer packets has to be transmitted within a pre-specified number of transmission time slots. Using the concept of supermodularity, we prove that under some conditions on the costs, the optimal transmission scheduling policy is threshold in the residual transmission time and the buffer occupancy. These two threshold results substantially reduce the computational complexity required to implement the optimal transmission scheduling policy.
Didactical assistance in e-learning process-oriented production environments
Authors: Helge Fredrich, Helmut M. Niegemann, Volker Zimmermann, Lasse Lehmann
Venue: Proceedings of the 10th IASTED International Conference on Computers and Advanced Technology in Education (2007)

Authors and developers of e-learning content are often not familiar with instructional design theories and their models. A didactical assistant (ID assistant) has been developed in order to improve the pedagogical quality of e-learning content, especially for the content production of SMEs in Europe. Theoretically, the ID assistant is based on a decision-based model of instructional design and attempts to implement the relevant characteristics of well-known ID models. A repository of instructional design principles, represented through pedagogical design patterns, is at the core of the system. In order to assist content developers in making ID decisions it was necessary to find criteria variables capable of differentiating between the diverse design patterns. Using as an example the EXPLAIN project, this article demonstrates the integration of a didactical assistant into a process-driven authoring solution system.
How Can We Teach Computational Literacy to All Levels of Students?
Authors: SooHwan Kim, SeonKwan Han, HyeonCheol Kim
Venue: Proceedings of the 2009 Fifth International Joint Conference on INC, IMS and IDC (2009)

In this paper, we discuss how to teach and learn computational literacy to all levels of students. Computational literacy is an important ability to understand and communicate information in current digital age and ubiquitous age. The digital has been used as a tool of communication along with language. Therefore, we would need to have ability to express our idea and understand an other’s presentation with language and digital, which is just computational Literacy. However, most educators focus on using computer and internet, not computational literacy. Therefore, we define the operational definition about computational literacy suited for the present age by analyzing existing computational Literacy. In addition, we extract educational factors from the relation with computational thinking that is the purpose of computational literacy. Finally, we discuss teaching-learning strategy of computational literacy for all level s of students.
Evolving Remote Laboratory Architectures to Leverage Emerging Internet Technologies
Authors: David Lowe, Steve Murray, Euan Lindsay, Dikai Liu
Venue: IEEE Transactions on Learning Technologies (2009)

There is growing research into, and development of, the use of the internet to support remote access by students to physical laboratory infrastructure. These remote laboratories can, under appropriate circumstances, support or even replace traditional (proximal) laboratories, provide additional or improved access at reduced cost, and encourage interinstitutional sharing of expensive resources. Effective design of remote laboratories requires attention to the design of both the pedagogy and the technical infrastructure, as well as how these elements interact. In this paper, we consider the architectures of remote laboratories, the shortcomings of existing implementations, and we argue that emerging internet technologies can assist in overcoming these shortcomings. We also consider the opportunities which these technologies provide in moving beyond both existing remote laboratories and existing proximal laboratories, to create opportunities which were not previously possible.
Geological uncertainties associated with 3-D subsurface models
Authors: L. Tacher, I. Pomian-Srzednicki, A. Parriaux
Venue: Computers Geosciences (2006)

Subsurface models are generally built from both subjective interpretation and mathematical interpolation/extrapolation techniques. These models are therefore uncertain, but their uncertainty is rarely expressed in a geological forecast. In this paper, an evaluation method of geological uncertainties related to 3-D subsurface models is proposed and tested on a real case. This method is based on the subsurface model, which is considered the most probable prediction (best guess). The various geological interfaces are handled as Gaussian random fields to which a model of spatial variability describing possible fluctuations around the best guess is applied. Several structural constraints, such as the shape of folds and thickness of layers are accounted for in the model. At this point, the local variance can be estimated throughout the study area by application of the simple kriging technique. Finally, the variability is converted into probabilities of occurrence of the various rock masses present in the study area. The probabilities are calculated according to intersection rules governing the stratigraphic sequence of the subsurface model. They enable one to probabilistically model subsurface structures in the form of a three-dimensional (3-D) probability field.
Organ Texture Synthesis for Virtual Reality-Based Surgical Simulators
Authors: Liu Xue-mei, Hao Ai-min, Zhao Qin-ping
Venue: Proceedings of the 2009 Second International Workshop on Computer Science and Engineering - Volume 01 (2009)

Virtual Reality-based simulators is an important tool for surgical skills training and assessment. In general, the degree of realism experienced by the trainees is determined by the visual and biomechanical fidelity of the simulator. Organ textures can greatly affect visual realism and hence the overall quality of the simulation. In this paper, we use a very simple algorithm that can efficiently synthesize a wide variety of organ textures. The algorithm uses pixel-based texture synthesize technology. For each pixel in the output image, an L-shaped neighborhood of current pixel of a specific size is considered. Each pixel from this neighborhood generates a “shifted” candidate pixel according to its original position in the input texture. The best pixel is chosen with a neighborhood most similar to the current L-shaped neighborhood in the output image. This method is fast and its implementation is straightforward. The experiment results show the algorithm is feasility and validity.
Remote Labs for Industrial IC Testing
Authors: Beatrice Pradarelli, Laurent Latorre, Marie-Lise Flottes, Yves Bertrand, Pascal Nouet
Venue: IEEE Transactions on Learning Technologies (2009)

This paper deals with the remote access to an Integrated Circuits (ICs) Automated Test Equipment (ATE) for both educational and engineering purposes. This experience was initiated in 1998 in the context of a French network (CNFM) in order to provide a distant control to industrial equipment to academic and industrial people. The actual shared resource is a Verigy V93K System-on-Chip (SoC) tester platform. The cost of such equipment is close to 1 million dollar, without taking into account the maintenance and attached human resources expenses to make it work properly daily. Although the sharing of such equipments seems to be obvious for education, the French experience is quite a unique example in the world. The paper introduces the context of industrial IC testing and justifies the introduction of labs in Electrical Engineering curricula. Practical information regarding IC testing and network setup for remote access are detailed, together with lab contents.
Encipherment Key Management System for Massive Web Contents
Authors: JinKyoung Heo
Venue: Proceedings of the 2009 Fifth International Joint Conference on INC, IMS and IDC (2009)

As the World Wide Web grows rapidly on a daily basis, the number of new computer attacks is also growing at a matching rate. Quantity of encrypted data that transmitted through web is increasing by development of communication technology. We have many problems; it is caused by technical development and service increase of user requests. It is necessary that create safe and reliable encryption keys in one web application system. As a result, service quality comes to be low because of increased network traffic and system overload. There must be a system. That should be improved in service quality to process data. This paper describes a new approach for design and implementation of distributed encryption key processing web application system. It is based on object activation, and can be used for saving serviceable objects to storage and reduce memory resource requested by clients.
A simple detect-and-forward scheme in fading channels
Authors: Mustapha Benjillali, Leszek Szczecinski
Venue: IEEE Communications Letters (2009)

In this letter, we introduce and analyze a Detect-and-Forward scheme for cooperative communications over fading channels based on the transmission of partial source-relay channel state information. The proposed scheme is simple to implement and its efficiency is demonstrated through constrained capacity calculation and throughput evaluation based on practical coding schemes.
An Unsupervised Approach for the Emergence of Ontologies from Personomies in Tagging-Based Systems
Authors: Carlos Alberto M. Basso, Josiane M. P. Ferreira, Sérgio Roberto P. da Silva
Venue: Proceedings of the 2009 Latin American Web Congress (la-web 2009) (2009)

Tagging-based systems are becoming a widely used tool as they are considered simple and quick to categorize resources. However, due to the free vocabulary used for tagging, and also because of its plane structure, there are some drawbacks inherent to this kind of system, mainly when users do the information retrieval. This paper presents a proposal for the emergence of ontologies from tagging-based systems, seeking to reduce information overload, thus minimizing the cognitive effort of users when processing information retrieval.
Robust CMOS micromachined inductors with structure supports for Gilbert mixer matching circuits
Authors: Jerry C. Wu, Mona E. Zaghloul
Venue: IEEE Transactions on Circuits and Systems II: Express Briefs (2009)

In this brief, three novel structure supports for on-chip CMOS-based micromachined inductors are proposed to improve mechanical stability. The inductors are fabricated using a two-step maskless post-CMOS process. A 3-D electromagnetic inductor simulation model is established for performance analysis of the inductors before fabrication. The proposed inductors are applied in the matching network of the double-balanced Gilbert mixer to improve the performance and mechanical reliability for mobile communication. The mixers with and without micromachined process inductors are fabricated in a 0.5-µm CMOS process. The measurement results show an 18.6% increase in the conversion gain, a 31.7% improvement in the third intercept point (IIP3), and a 25.3% reduction in the noise figure.
An integrated active reflector for phase-sweep cooperative diversity
Authors: Jean-François Bousquet, Sebastian C. Magierowski, Geoffrey G. Messier
Venue: IEEE Transactions on Circuits and Systems II: Express Briefs (2009)

In this brief, we present the design of a fully integrated all-analog wireless reflector/repeater that acts as the relay in a phase-sweeping cooperative diversity scheme. This approach multiplies the coverage of an indoor wireless sensor network by four. Using 0.13-µm CMOS and Vdd = 1 V, the active reflector provides 45-dB gain and satisfies network specifications for a dc power of as low as 0.66 mW.
A tag recommendation system for folksonomy
Authors: Ning Zhang, Yuan Zhang, Jie Tang
Venue: Proceeding of the 2nd ACM workshop on Social web search and mining (2009)

Social bookmarking tools become more and more popular nowadays and tagging is used to organize information and allow users to recall or search the resources. Users need to type the tags whenever they post a resource, so that a good tag recommendation system can ease the process of finding some useful and relevant keywords for users. Researchers have made lots of relevant work for tag recommendation systems, but those traditional collaborative systems may not perform well in the case of a new user and a new resource. To address this problem, we propose a tag recommendation system for two different cases. The first case is that the active user or active resource is a new one which has not appeared in the past while the second case is that the active user and resource has already been posted. In this paper, we present two different methods for these two cases: a content-based method and a graph-based method. We implement our tag recommendation system in a realworld academic Folksonomy system. In order to gain better results,we apply improvements and combinations of previous work in each of these two methods.and combinations of previous work in each of these two methods. We participated into the Discovery Challenge 2009 with the proposed methods. The results of our teams are within the top teams.
Decision making rules for assessment of students' knowledge
Authors: S. Encheva, S. Tumin
Venue: Proceedings of the 10th IASTED International Conference on Computers and Advanced Technology in Education (2007)

Automated tests are widely recognized as to be among the most useful educational tools. Unfortunately most of the existing computer systems providing technical support for such tests are based on classical logic and therefore cannot reason in the presence of inconsistencies. In this paper we discuss how to assess students' understanding of new terms and concepts applying many-valued logic. This allows an assessment system to give meaningful responces in case of incomplete or inconsistent input.
Adaptive blind equalization for MIMO systems under α-stable noise environment
Authors: Li Sen, Qiu Tianshuang, Zha Daifeng
Venue: IEEE Communications Letters (2009)

The presence of non-Gaussian impulsive noise in wireless system can degrade the performance of existing equalizers and signal detectors. In this paper, the problem of blind source separation and equalization for MIMO systems in heavy-tailed impulsive noise is studied. A generalized multi-user constant modulus cost function by employing the fractional lower-order statistic of the equalizer input signal is proposed. The associated adaptive blind equalization algorithm based on a stochastic gradient descent method is defined as fractional lower-order multi-user constant modulus algorithm (FLOS_MU_CMA). Computer simulations are presented to illustrate the performance of the new algorithm.
A game-centric approach to foster undergraduate learning
Authors: Muhammad Yousuf Bawany, Muhammad Sibghatullah Siddiqui, Syed Jamal Hussain, Syed Jafar Hussain
Venue: Proceedings of the 10th IASTED International Conference on Computers and Advanced Technology in Education (2007)

Computer Gaming has emerged as one of the fastest growing industries in the world. A recent study shows that almost sixty percent of the Americans (145 million approx.) play games and this number is increasing every year. Gaming is as prevalent in the rest of the world as in America. This paper presents some approaches for teachers to help them assist students by putting special emphasis on a common interest area of today's university-going population, i.e. games. This indirectly focuses on educating CS as well as non-CS students by highlighting the contribution they can make as part of the Gaming industry. Moreover, it presents a novel learning paradigm to help students learn different topics, which some may find difficult, by using examples from contemporary games and thereby, enabling them to take active interest in studies.
Adversary aware surveillance systems
Authors: Vivek K. Singh, Mohan S. Kankanhalli
Venue: IEEE Transactions on Information Forensics and Security (2009)

We consider surveillance problems to be a set of system-adversary interaction problems in which an adversary can be modeled as a rational (selfish) agent trying to maximize his utility. We feel that appropriate adversary modeling can provide deep insights into the system performance and also clues for optimizing the system's performance against the adversary. Further, we propose that system designers should exploit the fact that they can impose certain restrictions on the intruders and the way they interact with the system. The system designers can analyze the scenario to determine conditions under which system outperforms the adversaries, and then suitably reengineer the environment under a "scenario engineering" approach to help the system outperform the adversary. We study the proposed enhancements using a game theoretic framework and present results of their adaptation to two significantly different surveillance scenarios. While the precise enforcements for the studied zero-sum ATM lobby monitoring scenario and the nonzero-sum traffic monitoring scenario were different, they lead to some useful generic guidelines for surveillance system designers.
IT and Business Alignment: The Effect on Productivity and Profitability
Authors: Elby M. Nash
Venue: IT Professional (2009)

Surveying business and IT executives from the pharmaceutical industry provides empirical data that offers new insight into how IT and business strategic-alignment maturity affects firm-level productivity and profitability.
Meta-RaPS approach for the 0-1 Multidimensional Knapsack Problem
Authors: Reinaldo J. Moraga, Gail W. DePuy, Gary E. Whitehouse
Venue: Computers and Industrial Engineering (2005)

A promising solution approach called Meta-RaPS is presented for the 0-1 Multidimensional Knapsack Problem (0-1 MKP). Meta-RaPS constructs feasible solutions at each iteration through the utilization of a priority rule used in a randomized fashion. Four different greedy priority rules are implemented within Meta-RaPS and compared. These rules differ in the way the corresponding pseudo-utility ratios for ranking variables are computed. In addition, two simple local search techniques within Meta-RaPS' improvement stage are implemented. The Meta-RaPS approach is tested on several established test sets, and the solution values are compared to both the optimal values and the results of other 0-1 MKP solution techniques. The Meta-RaPS approach outperforms many other solution methodologies in terms of differences from the optimal value and number of optimal solutions obtained. The advantage of the Meta-RaPS approach is that it is easy to understand and easy to implement, and it achieves good results.
Is it congestion or a DDoS attack?
Authors: Amey Shevtekar, Nirwan Ansari
Venue: IEEE Communications Letters (2009)

We propose a new stealthy DDoS attack model referred to as the "quiet" attack. The attack traffic consists of TCP traffic only. Widely used botnets in today's various attacks and newly introduced network feedback control are integral part of the quiet attack model. We show that short-lived TCP flows can be intentionally misused. The quiet attack is detrimental to the Internet traffic and at the same time difficult to be detected by using current defense systems. We demonstrate the inability of representative defense schemes such as adaptive queue management and aggregate congestion control to detect the quiet attack.
Methodology for evaluating a novel education technology: a case study of handheld video games in Chile
Authors: Jesse L. Margolis, Miguel Nussbaum, Patricio Rodriguez, Ricardo Rosas
Venue: Computers Education (2006)

Many school systems, in both the developed and developing world, are implementing educational technology to assist in student learning. However, there is no clear consensus on how to evaluate these new technologies. This paper proposes a comprehensive methodology for estimating the value of a new educational technology in three steps: benefit analysis, through the administration of a well-designed experiment; cost analysis, which incorporates costs to weigh against the benefits; and feasibility analysis, which introduces real-world concerns that may affect the ability to actually implement the technology. To illustrate the methodology, a case study from Chile is used where portable educational video games were introduced into first and second grade classrooms with the aim of improving learning in mathematics and language. This paper demonstrates the importance of all three steps in the evaluation process and provides a framework for future analyses.
Design of distributed unique words for enhanced frame synchronization
Authors: M. Villanti, M. Iubatti, A. Vanelli-Coralli, G. E. Corazza
Venue: IEEE Transactions on Communications (2009)

A novel approach is introduced for the design of a Unique Word (UW) for frame synchronization in Time Division Multiplexing/Time Division Multiple Access (TDM/TDMA) systems. In particular, the UWsymbols are distributed in each frame in a specific pattern in order to optimize the UW autocorrelation properties. The distribution patterns are scalable, since they preserve their autocorrelation properties under truncation. The resulting frame structure enables the use of several types of UWs, including the Silent-UW (SUW) and the Unit-UW (UUW), that are novel approaches for which the optimal Bayes detector is derived. An analytical performance characterization is presented along with comparisons with state-of-the-art alternatives. We show that SUW can significantly outperform the classic UW in the presence of frequency offsets or whenever data interference is the main impairment to cope with, i.e. at moderate to high signal to noise ratios. Interestingly, this performance improvement comes with the further advantage of a considerable complexity reduction. Hence UUW is shown to provide both performance improvement and complexity reduction.
Building simple multiscale visualizations of outcrop geology using virtual reality modeling language (VRML)
Authors: John B. Thurmond, Peter A. Drzewiecki, Xueming Xu
Venue: Computers Geosciences (2005)

Geological data collected from outcrop are inherently three-dimensional (3D) and span a variety of scales, from the megascopic to the microscopic. This presents challenges in both interpreting and communicating observations. The Virtual Reality Modeling Language provides an easy way for geoscientists to construct complex visualizations that can be viewed with free software. Field data in tabular form can be used to generate hierarchical multi-scale visualizations of outcrops, which can convey the complex relationships between a variety of data types simultaneously. An example from carbonate mud-mounds in southeastern New Mexico illustrates the embedding of three orders of magnitude of observation into a single visualization, for the purpose of interpreting depositional facies relationships in three dimensions. This type of raw data visualization can be built without software tools, yet is incredibly useful for interpreting and communicating data. Even simple visualizations can aid in the interpretation of complex 3D relationships that are frequently encountered in the geosciences.