ppxscal/embedding_network huggingface dataset:
A Multi-agent Model to Develop Knowledge Management Systems
Authors: Aurora Vizcaino, Juan Pablo Soto, Javier Portillo, Mario Piattini
Venue: Proceedings of the 40th Annual Hawaii International Conference on System Sciences (2007)

Developing Knowledge Management Systems is a complicated task since it is necessary to take into account how the knowledge is generated, how it can be distributed in order to reuse it and other aspects related to the knowledge flows. On the other hand, many technical aspects should also be considered such as what knowledge representation or retrieval technique is going to be used. To find a balance between both aspects is important if we want to develop a successful system. However, developers often focus on technical aspects giving less importance to knowledge issues. In order to avoid this, we have developed a model to help computer science engineers to develop these kinds of systems. In our proposal, firstly, we define a knowledge life cycle model that, according to literature and our experience, ponders all the stages that a knowledge management system should give support to. Later, we describe the technology (software agents) that we recommend to support the activities of each stage. The paper explains why we consider that software agents are suitable for this end and how they can work in order to reach their goals. Moreover, a prototype that uses these agents is also described.
Experiences with CC2001 at a small college
Authors: John F. Dooley
Venue: Proceedings of the 12th annual SIGCSE conference on Innovation and technology in computer science education (2007)

In this poster, we describe our experiences over the past two years using the CC2001 small department model for our computer science major. We discuss issues with the number of required courses, the mathematics requirement, course prerequisites, our capstone experience, and the relative lack of computer science theory in the new curriculum.
Designing a Framework for Scalable Coordination of Wireless Sensor Networks, Context Information and Web Services
Authors: Yoshihiro Kawahara, Nao Kawanishi, Masahiro Ozawa, Hiroyuki Morikawa, Tohru Asami
Venue: Proceedings of the 27th International Conference on Distributed Computing Systems Workshops (2007)

Context-aware services are one of the key applications in the ubiquitous computing environment where physical and virtual information are seamlessly integrated across the network. However, so far we have found few discussions on architectural styles for such integration of wireless sensor networks and other networks services and objects. Conventional context aware services have been built in an ad-hoc manner, making it difficult to build new applications or evolve existing ones. The objective of this paper is to discuss the architectural requirements from several points of view such as entry barrier, extensibility, interoperability, and scalability. Then we show a service coordination framework based on REST architectural style.
Personalized music distribution
Authors: M. Alghoniemy
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 2000. on IEEE International Conference - Volume 04 (2000)

New media distribution channels have created a strong need for digital media personalization that helps both users and producers get the most of media products. We concentrate on the customized music delivery issue. We propose an approach for constructing a sequence of tracks that satisfies user requirements and at the same time optimally exploits music catalogs. An optimal solution consists of examining all possible tracks enumeration in the database. This is clearly a combinatorial NP-hard problem. We use vector space concepts to formulate the constrained sequence retrieval problem as an integer program. Our experiments demonstrate the power of our approximation to the original problem in reducing the search space and producing valid solutions.
Range Detection Approach in Interactive Virtual Heritage Walkthrough
Authors: M. S. Sunar, A. M. Zin, T. M. T. Sembok
Venue: Proceedings of the 16th International Conference on Artificial Reality and Telexistence--Workshops (2006)

Exploring virtual world will give a memorable experience to the users. Generally, they are expecting smooth navigation with high quality image drawn into their eyes. Nevertheless, when the virtual world is growing simultaneously with the number of objects, the navigation will be detained. Yet, the frame rates can become unacceptable. In this paper, we present and examine range detection approach for view frustum culling to effectively speed-up the interactive virtual heritage project namely Ancient Malacca Virtual Walkthrough. Normal six plane view frustum culling approach use the plane equation to test whether objects is within the visible region. However, range detection approach is different with normal six plane view frustum. It is based on camera referential point and tests the objects if they are in the viewing range. The results show that this approach is able to increase the rendering performance of the virtual walkthrough without sacrificing the visual quality.
On The Span Of A Random Channel Assignment Problem
Authors: Colin McDiarmid
Venue: Combinatorica (2007)

In the radio channel assignment problems considered here, we must assign a &#x2018;channel&#x2019; from the set 1,2,... of positive integers to each of n transmitters, and we wish to minimise the span of channels used, subject to the assignment leading to an acceptable level of interference. A standard form of this problem is the &#x2018;constraint matrix&#x2019; model. The simplest case of this model (the 0, 1 case) is essentially graph colouring. We consider here a random model for the next simplest case (with lengths 0, 1 or 2), and determine the asymptotic behaviour of the span of channels needed as n&#x2192;&#x221e;. We find that there is a &#x2018;phase change&#x2019; in this behaviour, depending on the probabilities for the different lengths.
Simulating MPEG-2 transport stream transmission over wireless ATM
Authors: A. Kassler
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 06 (1999)

Within this paper we simulate the transmission of MPEG-2 transport stream (TS) packets over a wireless ATM network. Based on a finite state radio channel model for the physical layer of a wireless ATM link including the characteristics of the ATM and MAC layer, different packing schemes are evaluated for encapsulating MPEG-2 transport stream packets in ATM adaptation Layer 5 (AAL5) PDUs. We analyze the performance with respect to both delay and visual quality in terms of PSNR based on a calculated cell error ratio (CER) for each given state of the radio model. The statistics show, that the 1TP (one MPEG-2 TS per AAL5 PDU) scheme outperforms all other packing schemes in terms of visual quality. At medium channel quality (38 dB), quality is judged to be good, although the CER may be as high as 25%.
Voice recognition focusing on vowel strings on a fixed-point 20-MIPS DSP board
Authors: Y. Nishida
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 01 (1999)

This paper describes a smart recognition system which performs character matching by replacing speech parameters with the five Japanese vowels and a few consonant categories. The proposed algorithm can make speaker-independent voice recognition. The algorithm has an advantage over the conventional speaker-independent word recognition system because it can reduce the required memory to about 0.5% of the conventional algorithm for storing the reference templates and for the instruction set, and can be performed even in a low-speed processor. We implemented this recognition algorithm in a fixed-point, 20 MIPS digital signal processor board with a 9-k/spl times/16-bit on-chip RAM. Recognition experiments using 20 Japanese city names had a 90.3% accuracy. Such an accuracy is good enough for a voice control system.
Precise and realistic utility functions for user-centric performance analysis of schedulers
Authors: Cynthia B. Lee, Allan E. Snavely
Venue: Proceedings of the 16th international symposium on High performance distributed computing (2007)

Utility functions can be used to represent the value users attach to job completion as a function of turnaround time. Most previous scheduling research used simple synthetic representations of utility, with the simplicity being due to the fact that real user preferences are difficult to obtain, and perhaps concern that arbitrarily complex utility functions could in turn make the scheduling problem intractable. In this work, we advocate a flexible representation of utility functions that can indeed be arbitrarily complex. We show that a genetic algorithm heuristic can improve global utility by analyzing these functions, and does so tractably. Since our previous work showed that users indeed have and can articulate complicated utility functions, the result here is relevant. We then provide a means to augment existing workload traces with realistic utility functions for the purpose of enabling realistic scheduling simulations.
Histogram-based fuzzy colour filter for image restoration
Authors: Stefan Schulte, Valérie De Witte, Mike Nachtegael, Dietrich Van der Weken, Etienne E. Kerre
Venue: Image and Vision Computing (2007)

A new impulse noise reduction method for colour images, called histogram-based fuzzy colour filter (HFC), is presented in this paper. The HFC filter is particularly effective for reducing high-impulse noise in digital images while preserving edge sharpness. Colour images that are corrupted with noise are generally filtered by applying a greyscale algorithm on each colour component separately. This approach causes artefacts especially on edge or texture pixels. Vector-based filtering methods were successfully introduced to overcome this problem. In this paper, we discuss an alternative technique so that no artefacts are introduced. The main difference between the new proposed method and the classical vector-based methods is the usage of colour component differences for the detection of impulse noise and the preservation of the colour component differences. The construction of the HFC filter involves three steps: (1) the estimation of the original histogram of the colour component differences, (2) the construction of suitable fuzzy sets for representing the linguistic values of these differences and (3) the construction of fuzzy rules that determine the output. Extensive simulation results show that the proposed filter outperforms many well-known filters (including vector-based approaches).
The first telecommunications engineering undergraduate program at Mexico
Authors: A. Herrera, J. Reyes
Venue: Proceedings of the Frontiers in Education Conference, on 1995. Proceedings., 1995 - Volume 02 (1995)

In Mexico, there were, until 1992, twelve engineering schools offering communication courses in areas of speciality in bachelor programs of different names. However, many private and public companies have shown insufficient human resources in this area. Meanwhile, the development of telecommunications has been growing exponentially in this country. Also in 1992, the Engineering School of the National Autonomous University of Mexico introduced a new undergraduate program in telecommunications engineering, the first one in Mexico. Small changes have been made in 1995 to follow international requirements, with the purpose of obtaining accreditation by other countries, especially by the other NAFTA countries. We present some characteristics of the program.
Capturing student's teamwork and open-ended design performance in an undergraduate multimedia engineering design class
Authors: A. McKenna
Venue: Proceedings of the 28th Annual Frontiers in Education - Volume 01 (1998)

The present work describes the authors experiences capturing student performance in the freshman design class ME39C: Multimedia Case Studies of Engineering Design, at the University of California, Berkeley, USA. The focus of the ME39C class is to facilitate students as they work in teams to develop an original web based multimedia case study of an engineering design. The paper emphasizes a qualitative approach to capturing student performance and focuses on the process of teamwork and the interaction among students. They used a series of different methods to triangulate, compare and evaluate student performance. Specifically, they used an original web-based discussion tool, student observations and interviews, and questionnaires. Initial findings revealed that information obtained by one method sometimes contradicted data obtained from another. These contradictions suggest caution when analyzing student performance based on just one point of view. The data also indicates that team work, both in terms of product and process, can and should be collected continuously throughout the semester in order to provide the necessary feedback essential to student learning and improvement. Using a variety of assessment techniques affords a more comprehensive analysis of student performance.
A client-side design and implementation for push to talk over cellular service: Research Articles
Authors: Lin-Yi Wu, Meng-Hsun Tsai, Yi-Bing Lin, Jen-Shun Yang
Venue: Wireless Communications Mobile Computing (2007)

This paper proposes a client architecture for the push to talk over cellular (PoC) service based on the open mobile alliance (OMA) PoC specifications v1.0 release. We show that most standard VoIP modules can be reused for the PoC client, and the VoIP software can be easily extended to support PoC service. Then we present the detailed message flows between the PoC client and other network entities in the PoC system. A PoC client prototype has been implemented in the Industrial Technology Research Institute (ITRI) and National Chiao-Tung University (NCTU) Joint Research Center. Copyright &copy; 2006 John Wiley & Sons, Ltd.
Michael G. Hinchey: Biological Inspiration.
Authors: Michael G. Hinchey
Venue: Proceedings of the First International Conference on Self-Adaptive and Self-Organizing Systems (2007)

Greater understanding of biology in modern times has enabled significant breakthroughs in improving healthcare, quality of life, and eliminating many diseases and congenital illnesses. Simultaneously there is a move towards emulating nature and copying many of the wonders uncovered in biology, resulting in "biologically inspired" systems. Significant results have been reported in a wide range of areas, with systems inspired by nature enabling exploration, communication, and advances that were never dreamed possible just a few years ago. We warn, that as in many other fields of endeavor, we should be inspired by nature and biology, not engage in mimicry. We describe some results of biological inspiration that augur promise in terms of improving the safety and security of systems, and in developing self-managing systems that we hope will ultimately lead to self-governing systems. We concentrate on the concept of swarm-based exploration missions that will enable NASA to explore space more efficiently and collect data never before available to scientists. We discuss several new self-x properties that will make such missions possible and that will also have application in other areas.
Scheduling with base station diversity and fairness analysis for the downlink of CDMA cellular networks: Research Articles
Authors: Mehrdad Dianati, Xuemin (Sherman) Shen, Kshirasagar Naik
Venue: Wireless Communications Mobile Computing (2007)

Efficient packet scheduling in CDMA cellular networks is a challenging problem due to the time variant and stochastic nature of the channel fading process. Selection diversity is one of the most effective techniques utilizing random and independent variations of diverse channels to improve the performance of communication over fading channels. In this paper, we propose two packet scheduling schemes exploiting base station selection diversity in the downlink of CDMA cellular networks. The proposed schemes rely on the limited instantaneous channel state information (CSI) to select the best user from the best serving base station at each time slot. This technique increases the system throughput by increasing multiuser diversity gain and reducing the effective interference among adjacent base stations. Results of Monte Carlo simulations are given to demonstrate the improvement of system throughput using the proposed scheduling schemes. In addition, we investigate fairness issue of wireless scheduling schemes. Due to different characteristics of wireless scheduling schemes, the existing fairness indexes may result in misleading comparison among different schemes. We propose a new fairness index to compare the overall satisfaction of the network users for different scheduling schemes. Copyright &copy; 2006 John Wiley & Sons, Ltd.
Slow write driver faults in 65nm SRAM technology: analysis and March test solution
Authors: A. Ney, P. Girard, C. Landrault, S. Pravossoudovitch, A. Virazel, M. Bastian
Venue: Proceedings of the conference on Design, automation and test in Europe (2007)

This paper presents an analysis of the electrical origins of Slow Write Driver Faults (SWDFs) [1] that may affect SRAM write drivers in 65nm technology. This type of fault is the consequence of resistive-open defects in the control part of the write driver. It involves an erroneous write operation when the same write driver performs two successive write operations with opposite data values. In the first part of the paper, we present the SWDF electrical phenomena and their consequences on the SRAM functioning. Next, we show how SWDFs can be sensitized and observed and how a standard March test is able to detect this type of fault.
Fast block matching algorithms for motion estimation
Authors: K. W. Cheng
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 04 (1996)

Motion compensation is an effective method for reducing temporal redundancy found in video sequence compression. However, the complexity of the full-search block matching algorithm (BMA) is extremely high and a number of fast algorithms have been proposed to reduce the computational complexity of the BMA. We propose three techniques for reducing the arithmetic complexity of the BMA. They are namely: (1) domain decimation, (2) error function subsampling, and (3) multiple candidates search. The domain decimation and error function decimation try to reduce the arithmetic complexity by reducing the number of operations in each comparison, the search range and number of locations searched. The multiple candidates search is a technique used to increase the robust of such algorithms. Combination of these techniques can generate algorithms with different tradeoff between arithmetic complexity and quality of prediction.
Mapping and Exploration of Complex Environments Using Persistent 3D Model
Authors: Jonathan Fournier, Benoit Ricard, Denis Laurendeau
Venue: Proceedings of the Fourth Canadian Conference on Computer and Robot Vision (2007)

An increasingly popular approach to support military forces deployed in urban environments consists in using autonomous robots to carry on critical tasks such as mapping and surveillance. In order to cope with the complex obstacles and structures found in this operational context, robots should be able to perceive and analyze their world in 3D. The method presented in this paper uses a 3D volumetric sensor to efficiency map and explore urban environments with an autonomous robotic platform. A key feature of our work is that the 3D model of the environment is preserved all along the process using a multiresolution octree. This way, every module can access the information it contains to achieve its tasks. Simulation and real word tests were performed to validate the performance of the integrated system and are presented at the end of the paper.
Incorporating computer aided device and process simulation tools in undergraduate courses
Authors: C. Johnson
Venue: Proceedings of the 26th Annual Frontiers in Education - Volume 01 (1996)

Semiconductor device design and fabrication are specialized fields in electrical engineering for which computer aided design (CAD) tools are becoming available. Normally, the design process is lengthy and costly, with many iterations required to achieve a successful product. CAD tools can reduce the time requirement and improve the overall yield. Its use has revolutionized the electronics industry and should be used to improve engineering education. Students would be exposed to design procedures and would be able to reinforce their understanding of electronic devices by participating in the device design process. This could be done by incorporating these topics into lectures, homework, lab assignments, and in semester long design projects which would give the student the opportunity to learn practical details of semiconductor device design and fabrication and in combination with background theory, achieve the balance of education, application and experience.
A transactional memory service in an extensible operating system
Authors: Yasushi Saito, Brian Bershad
Venue: Proceedings of the annual conference on USENIX Annual Technical Conference (1998)

This paper describes Rhino, a transactional memory service implemented on top of the SPIN operating system. Rhino is implemented as an extension that runs in SPIN kernel's address space. We discuss how the extension structure of Rhino can solve performance problems previously unavoidable in traditional systems, and we quantify its benefits. We also introduce three alternative buffer management schemes and study their performance under various workloads.
System-Level Diagnosis Strategies for n-star Multiprocessor Systems
Authors: A. Kavianpour
Venue: Proceedings of the 1993 International Conference on Parallel Processing - Volume 02 (1993)

System-level diagnoais for n-star multicomputer systems is considered. One -t and one - i/t strategies are one-step diagnosis strategies which involve only one testing phase and one repair phase. The ACM Portal is published by the Association for Computing Machinery. Copyright © 2010 ACM, Inc. Terms of Usage Privacy Policy Code of Ethics Contact Us Useful downloads: Adobe Acrobat QuickTime Windows Media Player Real Player
Scriptics connect
Authors: Eric Melski, Scott Stanton, John Ousterhout
Venue: Proceedings of the 7th conference on USENIX Tcl/Tk - Volume 7 (2000)

Scriptics Connect is a commercial product from Scriptics Corporation that provides an XML-based platform for business-to-business applications. It takes advantage of XML as a standard mechanism for formatting structured data, and uses standard World Wide Web servers and Tcl to provide the infrastructure needed to support business-to-business applications. In addition, it uses Tcl to greatly simplify the task of writing XML-based business-to-business applications.