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compression of Molecular Interaction Fields Using Wavelet Thumbnails: Application to Molecular Alignment

JOURNAL OF CHEMICAL INFORMATION AND MODELING 2012年第3期52卷 757-769页

作者： Martin, Richard L. Gardiner, Eleanor J. Senger, Stefan Gillet, Valerie J. Univ Sheffield Informat Sch Sheffield S1 4DP S Yorkshire England GlaxoSmithKline Res & Dev Ltd Computat & Struct Chem Stevenage SG1 2NY Herts England

Molecular interaction fields provide a useful description of ligand binding propensity and have found widespread use in computer-aided drug design, for example, to characterize protein binding sites and in small molecular applications, such as three-dimensional quantitative structure activity relationships, physicochemical property prediction, and virtual screening. However, the grids on which the field data are stored are typically very large, consisting of thousands of data points, which make them cumbersome to store and manipulate. The wavelet transform is a commonly used data compression technique, for example, in signal processing and image compression. Here we use the wavelet transform to encode molecular interaction fields as wavelet thumbnails, which represent the original grid data in significantly reduced volumes. We describe a method for aligning wavelet thumbnails based on extracting extrema from the thumbnails and subsequently use them for virtual screening. We demonstrate that wavelet thumbnails provide an effective method of capturing the three-dimensional information encoded in a molecular interaction field.

关键词： data compression technology wavelets molecular orientation Molecular electric field molecular force constants molecular biology Field data wavelet transforms compression molecular interactions

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Hybrid test data compression technique for low-power scan test data

Hybrid test data compression technique for low-power scan te...

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International Symposium on Information technology Convergence

作者： Song, Jaehoon Lee, Junseop Kim, Byeongjin Jung, Taejin Yi, Hyunbean Park, Sungju Hanyang Univ Dept Comp Sci & Engn Seoul South Korea

ISBN: (纸本)9780769530451

The large test data volume and power consumption are major problems in testing System-on-a-Chip (SoC) which is a key component of today's embedded system. To reduce the test application time from an Automatic Test Equipment (ATE), a new test data compression technique is proposed in this paper. Don't-cares in a pre-computed test cube set are assigned to reduce the test power consumption. Then, fully specified lowpower test data is transformed to improve compression efficiency by neighboring bit-wise exclusive-or technique. Finally, test set converted is compressed to reduce test application time.

关键词： application time Power consumption Test data compression data compression technology sweep test Test systems Crucial components test cube LOW POWER observational data

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compression using efficient multicasting

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JOURNAL OF COMPUTER AND SYSTEM SCIENCES 2001年第1期63卷 127-145页

作者： Adler, M Leighton, T Univ Massachusetts Dept Comp Sci Amherst MA 01003 USA MIT Dept Math & LCS Cambridge MA 02139 USA Akamai Technol Cambridge MA 02139 USA

Many multiprocessor systems have the ability to broadcast and/or multicast information efficiently. However, this ability is often overlooked when designing algorithms for these systems. In this paper, we introduce a new compression technique that uses efficient multicasting to significantly reduce the amount of information Communicated during parallel and distributed computation, resulting in significantly faster algorithms for Fast Fourier Transforms and sorting on shared memory parallel models with limited bandwidth. These algorithms demonstrate the importance of taking advantage of efficient multicasting. The compression technique uses a new, natural variant of Ramsey theory, which may be of independent interest. (C) 2001 Academic Press.

关键词： shared memory data compression technology Bandwidth Multiprocessor Design Algorithm image compression method algorithms Parallel Lines algorithm for production system Fast Fourier transform Fourier Transform

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ECG data compression using non-redundant templates

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IETE TECHNICAL REVIEW 2000年第5期17卷 299-310页

作者： Saxena, SC Kumar, V Hamde, ST Univ Roorkee Dept Elect Engn Roorkee 247667 Uttar Pradesh India

This paper presents a new direct data compression technique which has been developed to perform the compression by down-sampling the ECG signal in steps by using a non-redundant template. The removed data samples in the process of down-sampling are stored in a data array as non-redundant template. The complete information about the samples amplitude and duration is retained in the compressed samples. The signal Is compressed by a factor of 8 for the signal sampled at 500 Hz or 16 for the signal sampled at 1000 Hz. It has been noted that 100 percent information of the morphology of the original signal is retained in the reconstructed signal. The method is consistent and reliable and can be used for both online and offline ECG data compression.

关键词： data compression technology Steps down-sampling compression jigs(templates)

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Real-time wavelet-integrated corrosion detection system for casing pipes

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INTEGRATED COMPUTER-AIDED ENGINEERING 2000年第2期7卷 155-168页

作者： Yin, JM de Gyvez, JP Lu, M Texas A&M Univ Dept Elect Engn College Stn TX 77843 USA

Corrosion occurs frequently at the interior or exterior of steel casing pipes used in underground gas storage or oil fields. It causes not only production loss but also environmental pollution. Hence, corrosion monitoring and early detection of corrosion pits and wall thinning on casing pipes are considerably important to the gas and petroleum industry. We introduce in this paper a new version of the direct current electromagnetic induction system which is capable of detecting small, isolated corrosion pits and holes on the casing wall. A sensor system based on the direct current electromagnetic induction instrument is coupled to an updated data acquisition system. Information represented by enormous data sensed by the downhole instruments is to be transmitted to the computer logging system on surface, and a wavelet data compression technique is incorporated. A complete internal/external circumferential survey of corrosion extent on casing pipes can be obtained. Unlike the conventional direct current induction instrument, this system provides all the measured Bur leakage signals and eddy current signals, and hence a full signature logging response. It allows an accurate differentiation of the casing pipe hardware from corrosion, and much easier interpretation of corrosions on casing pipes. To achieve the real time mode during the logging operation, a VLSI integrated circuit realizing the wavelet transform has been designed. Simulations have been conducted, and the integrated circuit has been fabricated. The test results show that the design is advantageous and the circuit performance is satisfying.

关键词： direct current Pipe cases Corrosion monitoring Etch pitting tube wall thickness Electromagnetic induction OIL FIELD Petroleum Industry data compression technology Underground gas storage Erosion pit Circuit optimization Clinical Test Result Detection systems Corrosion

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Wavelet based compression and feature selection for vibration analysis

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JOURNAL OF SOUND AND VIBRATION 1998年第5期211卷 735-760页

作者： Staszewski, WJ Univ Sheffield Dept Mech Engn Dynam Res Grp Sheffield S1 3JD S Yorkshire England

This paper is concerned with wavelet based linear transformations for data compression and feature selection in vibration analysis. Recent developments in wavelet data compression are summarized. A discussion of various types of data including periodic, continuous non-stationary and transient non-stationary signals, are used to show practical aspects of wavelet compression. The analysis employs smooth wavelets and compactly supported wavelets. It has been shown that compression in vibration analysis can be used not only for effective storage and transmission of the data but also for feature selection. A number of different approaches have been presented to show coefficient selection procedures. This includes procedures based on truncated wavelet coefficients according to their amplitude, position and frequency location and a data compression technique based on optimal wavelet coefficients. (C) 1998 Academic Press Limited.

关键词： Feature extraction data compression technology Effective storage wavelets Vibration analysis Wavelet coefficients data types linear transformations data compression compression

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CAM BASED VLSI ARCHITECTURES FOR DYNAMIC HUFFMAN CODING

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IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 1994年第3期40卷 282-289页

作者： LIU, LY WANG, JF WANG, RJ LEE, JY Department of Electrical Engineering National Cheng Kung University Tainan Taiwan Department of Electrical Engineering Chang Gung College of Medicine and Technology Tainan Taiwan

The dynamic Huffman coding is a data compression technique, and famous for its flexibility. However, it has not been available for real-time applications because the adaption process is complex. In this paper, we proposed the architectures for dynamic Huffman coding. Both of the encoder and decoder are constructed by using the CAM-based memory modules. These memory modules parallelly perform the adaption process so that the coding can be efficiently executed. The encoder with the code table containing 32 symbols has been implemented. The simulation results show that the encoder can yield a input throughput of 40 Mbps operating at 40 MHz with 50% compression ratio.

关键词： ARCHITECTURE data compression technology real-time application program compression ratio Simulation results decoders Huffman codes Very large scale integration ENCODER accessor

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ECG data-compression TECHNIQUES - A UNIFIED APPROACH

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IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING 1990年第4期37卷 329-343页

作者： JALALEDDINE, SMS HUTCHENS, CG STRATTAN, RD COBERLY, WA UNIV TULSA DEPT ELECT ENGN TULSA OK 74104 USA UNIV TULSA DEPT COMP & MATH SCI TULSA OK 74104 USA

Electrocardiogram (ECG) compression techniques are compared, and a unified view of these techniques is established. ECG data compression schemes are presented in two major groups: direct data compression and transformation methods. The direct data compression techniques are ECG differential pulse code modulation (DPCM) and entropy coding, AZTEC, Turning-point, CORTES, Fan and SAPA algorithms, peak-picking, and cycle-to-cycle compression methods. The transformation methods include Fourier, Walsh, and Karhunen-Loeve transforms. The theoretical bases behind the direct ECG data compression schemes are presented and classified into three categories: tolerance-comparison compression, DPCM, and entropy coding methods. A framework for evaluation and comparison of ECG compression schemes is presented.

关键词： differential pulse code modulation data compression technology data compression Entropy coding electrochemical grinding

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A data-compression TECHNIQUE FOR BUILT-IN SELF-TEST

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IEEE TRANSACTIONS ON COMPUTERS 1988年第9期37卷 1151-1156页

作者： REDDY, SM SALUJA, KK KARPOVSKY, MG UNIV WISCONSIN DEPT ELECT & COMP ENGNMADISONWI 53706 BOSTON UNIV DEPT ELECT & COMP ENGNBOSTONMA 02215

A data compression technique called self-testable and error-propagating space compression is proposed and analyzed. Faults in a realization of Exclusive-OR and Exclusive-NOR gates are analyzed, and the use of these gates in the design of self-testing and error propagating space compressors is discussed. It is argued that the proposed data-compression technique reduce the hardware complexity in built-in self-test (BIST) logic designs using external tester environments

关键词： data compression technology Compressors gates Logic design Automatic testing data compression exclusive OR Built-in self test

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