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TENCON '94. IEEE Region 10's Ninth Annual International Conference. Theme: Frontiers of Computer Technology. Proceedings of 1994

Date 22-26 Aug. 1994

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Displaying Results 1 - 25 of 218
  • A simulation study of plant hybridization using L/sup +/-systems

    Publication Year: 1994, Page(s):123 - 127 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (333 KB)

    A novel approach is proposed to extend the L-system formalism to model the hybridization of plant forms. Several algorithms are developed and tested. Pictures illustrating these algorithms are generated by using computer graphics. These preliminary results demonstrate that the proposed new approach deserves further refinements.<> View full abstract»

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  • Proceedings of TENCON'94 - 1994 IEEE Region 10's 9th Annual International Conference on: 'Frontiers of Computer Technology'

    Publication Year: 1994
    Request permission for commercial reuse | PDF file iconPDF (360 KB)
    Freely Available from IEEE
  • Optimal receivers for code diversity frequency hopped spread-spectrum multiple-access communication systems

    Publication Year: 1994, Page(s):697 - 701 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    At every hop in a conventional frequency-hopped spread-spectrum multiple-access (FH-SSMA) system, each transmitter sends its data using a single frequency bin. In this paper, a scheme in which several frequency bins are simultaneously used by a transmitter is studied. Two decoding schemes based on the maximum a posteriori (MAP) decision rule are proposed and analyzed View full abstract»

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  • Effect of fading in a multihop packet radio network with capture

    Publication Year: 1994, Page(s):702 - 707 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    We study the effect of fading in a contention-limited multihop packet radio network (PRN) with capture. Four transmission strategies based on the Most Forward with Fixed Range (MFR), Nearest with Forward Progress (NFP), Minimal Angular Deviation (MAD), and Angular to Transmission Range Ratio (ARR) routing schemes are studied. Results show that all four transmission strategies perform worse in the ... View full abstract»

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  • A nonuniform sampling delta modulation technique

    Publication Year: 1994, Page(s):708 - 712 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    In this paper, a novel nonuniformly sampling delta modulation (NSDM) technique is investigated; its characteristics and implementation scheme are also described. The results have shown that the technique has the advantages of a higher coding efficiency, and a larger signal-to-noise ratio as compared to that of the conventional DM View full abstract»

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  • Efficient distributed recovery algorithm using non-FIFO channel in distributed network

    Publication Year: 1994, Page(s):166 - 171 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    This paper presents a recovery algorithm using a vector clock for distributed networks. The main idea of our recovery algorithm started from two concepts. The first concept is the use of global local time for dependency tracking. We can get the maximal state with the global local time. The second concept is the snapshot algorithm. We can have a complete view of global state with the snapshot algor... View full abstract»

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  • Probabilistic concurrent programming using multiset transactions

    Publication Year: 1994, Page(s):713 - 717 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The GAMMA parallel programming model, based on the multiset data structure and a succession of chemical reactions consuming the elements of the multiset and producing new elements according to specific rules, is a very useful new paradigm. This paper extends GAMMA model to its probabilistic version called P-GAMMA model. The P-GAMMA model can realise probabilistic, classifier, bucket-brigade, and g... View full abstract»

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  • A distributed scheme for many-to-one embedding binary trees into hypercubes

    Publication Year: 1994, Page(s):172 - 176 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The commercial hypercube-based machine is a good physical architecture for embedding various logical topologies because of its logarithmic diameter and high bandwidth. Through such embedding, the algorithms originally developed for logical topologies can be directly executed on hypercubes. We present a distributed scheme for embedding larger binary trees into smaller hypercubes. From a practical p... View full abstract»

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  • The design of the DUPLEX machine

    Publication Year: 1994, Page(s):718 - 722 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    As computers become less expensive, interest in using CPUs to build novel parallel systems has increased. The goal is to achieve high parallelism at low cost. We first examine the reasons why we need the graph reduction machine for the support of declarative languages to achieve high parallelism. We survey recent development in graph reduction machines, to point out their strengths and weaknesses.... View full abstract»

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  • Block adaptive subband VPIC

    Publication Year: 1994, Page(s):412 - 416 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    SBC is combined with VPIC to eliminate the blockiness and reduce the jagged edge artifact. A totally new set of 2×2 patterns is designed to code the highly compacted subband signals. The results on two bit allocation schemes are evaluated. Compare to the full band VPIC, the performance of the new technique is so good that we only need to retain the lowest frequency band while the other high ... View full abstract»

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  • Load balancing strategies for ray tracing on parallel processors

    Publication Year: 1994, Page(s):177 - 181 vol.1
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Ray tracing is one of the computer graphics techniques used to render high quality images. Unfortunately, the ray tracing of complex scenes can require large amounts of CPU time, making the technique impractical for everyday use. Since the ray tracing calculations that determine the values of individual pixels are independent, this appears to be an easy problem to parallelize, and parallel algorit... View full abstract»

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  • CLUMPS: a model of efficient, general purpose parallel computation

    Publication Year: 1994, Page(s):723 - 727 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    Campbell's Lenient Unified Model of Parallel Systems (CLUMPS) is presented, a candidate model of parallel computation which aims to tackle and solve the deficiencies of existing candidate models. It is shown that all parallel computers can perform the same computations, but differ in their ability to support different communication loads. This conclusion is reflected in the definition of CLUMPS wh... View full abstract»

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  • Error concealment algorithms for an ATM videoconferencing system

    Publication Year: 1994, Page(s):837 - 841 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The paper describes videoconferencing workstation using ATM for the transmission of all data and Motion-JPEG for compression of the video. Of particular interest is the work on algorithms to help conceal the errors that arise from transmission over an ATM network. Several methods are discussed and the results of some subjective assessments of typical images are presented View full abstract»

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  • A 5.4 kbps speech coder based on multi-band excitation and linear predictive coding

    Publication Year: 1994, Page(s):417 - 421 vol.1
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Recent work has shown that multi-band excitation (MBE) is capable of synthesizing high quality speech in the range of 4.8-8.0 kbps. In this paper, the multi-band excitation and linear predictive coding (MBE-LPC) model, which used the LPC analysis to obtain the prediction residual, and uses the MBE model to estimate the residual spectrum is presented. Our motivation is to improve the excitation mod... View full abstract»

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  • A fundamental frequency detector of speech signals based on short time Fourier transform

    Publication Year: 1994, Page(s):526 - 530 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The design of an accurate speech fundamental frequency detector is one of the most challenging areas of speech signal processing research. A new fundamental frequency determination method for speech signals is presented in this paper. This new method is based on a wavelet transform followed by a short-time Fourier transform. The wavelet transform is used to eliminate and attenuate the harmonics of... View full abstract»

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  • Efficient distributed schemes for embedding binary trees into incomplete hypercubes

    Publication Year: 1994, Page(s):182 - 186 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Presents two fundamental schemes to embed four types of tree topologies (complete binary trees, two-rooted complete binary trees, Fibonacci search binary trees and incomplete binary trees) into incomplete hypercubes with a dilation of 1. Our results show that the embeddings in incomplete hypercubes can lead to better processor utilization as compared to those obtained in complete hypercubes. Moreo... View full abstract»

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  • Service partition model for programming interactive distributed applications

    Publication Year: 1994, Page(s):269 - 273 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    We propose a service partition model as a design methodology of distributed applications, especially in interactive distributed applications. We developed a set of communication mechanisms for linking each module of interactive distributed applications. Mapping an interactive distributed application into service partition model is much easier than mapping it into a client server model. Implementin... View full abstract»

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  • Parallel computing efficiency: climbing the learning curve

    Publication Year: 1994, Page(s):728 - 732 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    Parallel computing shows considerable potential to deliver cost-effective solutions to applications with high requirements in performance. However, current experience shows that performance often falls well below user expectations and below what would be considered cost-effective. Therefore, MPC hardware and software designers need to focus on the factors which affect parallel computing efficiency... View full abstract»

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  • Testing criteria selecting strategy

    Publication Year: 1994, Page(s):785 - 789 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A number of testing path selection criteria have been proposed. These criteria can be categorized as falling between all-statements criterion and all-paths criterion. In order to help software developers to adopt an appropriate testing technology to test software, this paper proposes a quantitative analysis basis of the comparison among different testing criteria, including all-p-uses/some-c-uses ... View full abstract»

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  • Computer graphic visualisation for the transmission line matrix method of microwave electromagnetic field simulation

    Publication Year: 1994, Page(s):113 - 117 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    An interactive 3D electromagnetic vector field visualisation software package is described. The visualisation methods are designed not just to enable the vector fields to be interpreted, but also, more importantly, to enable microwave circuit engineers to interpret the results of a computer simulation as if they were performing an actual experiment. This is done by enabling the operator to place v... View full abstract»

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  • A model for expression and support of multimedia applications requirements at end-systems

    Publication Year: 1994, Page(s):842 - 846 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    This paper presents the principal requirements of multimedia applications at end-systems and provides a simplified means for specifying these requirements. The specifications allow a suitable support by the underlying system by offering a clear way for mapping and managing QoS needs for multimedia applications. A model for achieving these aims has been developed. The model is based on the definiti... View full abstract»

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  • On-line multiprocessor scheduling algorithms for real-time tasks

    Publication Year: 1994, Page(s):607 - 611 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The existing on-line scheduling algorithms EDA (Earliest Deadline Algorithm) and LLA (Least Laxity Algorithm) are not sufficient for scheduling real-time sporadic tasks in multiprocessor systems. EDA has low context switching overhead but suffers from “multiple processor anomalies”. LLA has good scheduling power, but the potential for high context switching overhead. We propose a new o... View full abstract»

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  • Block adaptive subband coding with optimized AMBTC

    Publication Year: 1994, Page(s):422 - 426 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A block adaptive SBC is combined with an adaptive AMBTC for near perfect reconstruction. The input images are decomposed into 4 subbands and are individually coded by AMBTC. The AMBTC will adapt to the signal variance and switch the output from 1 to 4 levels dynamically. Its performance is further optimized by Dynamic Range Tuning (DRT) and Central Aggregate Optimization (CAO). To avoid costly hig... View full abstract»

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  • Frequency offset estimation via planar extended Kalman filter

    Publication Year: 1994, Page(s):531 - 533 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    A planar extended Kalman filter for estimating frequency offset is presented. It extracts the frequency offset from the estimates of its sine and cosine components. Simulations show that this filter acquires faster and tracks better in the steady state than the one that estimates the frequency offset directly View full abstract»

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  • Analysis of the effect of size of omega network on its fault tolerance behaviour in presence of multiple faults

    Publication Year: 1994, Page(s):628 - 631 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The paper deals with comprehensive treatment of the fault tolerant characteristics of a class of nonredundant multistage interconnection network. The observations and results presented are around omega networks, as a representative member of the class of topologically equivalent nonredundant multistage interconnection network. As fault model, the paper considers that the multiple switching element... View full abstract»

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