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Bloom histogram: path selectivity estimation for XML data with updates 04

Proceedings of the Thirtieth international conference on Very large data bases - Volume 30

作者： Wei Wang Haifeng Jiang Hongjun Lu Jeffrey Xu Yu School of Computer Science and Engineering University of NSW Australia and NICTA Australia Dept. of Computer Science Hong Kong Univ. of Sci. & Tech. Hong Kong China Department of System Engineering and Engineering Management The Chinese Univ. of Hong Kong Hong Kong China

ISBN: (纸本)9780120884698

Cost-based XML query optimization calls for accurate estimation of the selectivity of path expressions. Some other interactive and internet applications can also benefit from such estimations. While there are a number of estimation techniques proposed in the literature, almost none of them has any guarantee on the estimation accuracy within a given space limit. In addition, most of them assume that the XML data are more or less static, i.e., with few updates. In this paper, we present a framework for XML path selectivity estimation in a dynamic context. Specifically, we propose a novel data structure, bloom histogram, to approximate XML path frequency distribution within a small space budget and to estimate the path selectivity accurately with the bloom histogram. We obtain the upper bound of its estimation error and discuss the trade-offs between the accuracy and the space limit. To support updates of bloom histograms efficiently when underlying XML data change, a dynamic summary layer is used to keep exact or more detailed XML path information. We demonstrate through our extensive experiments that the new solution can achieve significantly higher accuracy with an even smaller space than the previous methods in both static and dynamic environments.

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Characterization of four-wave mixing in electroabsorption modulator and its application to high-speed optical demultiplexing

Characterization of four-wave mixing in electroabsorption mo...

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Optical Fiber Communication (OFC) Conference

作者： E.S. Awad P.S. Cho N. Moulton J. Goldhar Department of Electrical and Computer Engineering University of Maryland College Park MD USA University System of Maryland Adelphi MD US Lab. for Phys. Sci. College Park MD USA

Investigation of FWM in EAM shows wide tuning range with almost flat efficiency response. Enhancement of FWM efficiency with EAM reverse bias was observed. Simultaneous optical demultiplexing and wavelength conversion... 详细信息

关键词： Four-wave mixing High speed optical techniques Nonlinear optics Optical mixing Optical modulation Demultiplexing Optical pumping Optical signal processing Optical wavelength conversion Probes

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Time partitioning framework for fully reconfigurable systems

Time partitioning framework for fully reconfigurable systems

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International Conference on Microelectronics, ICM

作者： B. Ouni A. Mtibaa M. Abid Laboratory of Electronics and Microelectronics University of Sciences of Monastir Tunisia Lab. of Electron. & Microelectron. Univ. of Sci. of Monastir Tunisia Computer Electronic and Smart system Engineering National Engineering School of Sfax (ENIS) Tunisia

The SRAM technologies allow the FPGA device to be reconfigured by loading new configuration data. Real time reconfiguration can be performed by loading each configuration data then reinitializing the device. The entire process (loading and reinitializing) requires less than some milliseconds, which can be used to fit a large application onto the FPGA device by partitioning the application over time. Our first aim in this paper consists of introducing a design flow for reconfigurable systems, the second aim consists of introducing a time partitioning algorithm that divides the input task graph model to an optimal number of partitions and puts each task in the appropriate partition so that the latency of the input task graph is optimal.

关键词： Field programmable gate arrays Data engineering Delay Algorithm design and analysis Partitioning algorithms Application software Costs Hardware Scheduling Optimal control

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Challenge of human factor influence for car safety

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Neural Network World 2004年第1期14卷 37-47页

作者： Novák, Mirko Votruba, Zdenëk Jt. Laboratory of System Reliability Faculty of Transportation Sciences Czech Technical University Prague Institute of Computer Science Acad. of Sci. of the Czech Republic Prague Department of Control Engineering Faculty of Transportation Sciences Czech Technical University Prague

The challenge of human factor influence for analyzing the reliability and safety of car transportation is discussed. An analysis of the density and the kind of use among the drivers in different regions and seasons of the year is made. The possibilities to detect the driver falling into a relaxant, somnolent or micro-sleep stage by the use of suitable combination of secondary factors are investigated. The operation of the driver in the moving car is an example of very complicated interaction between several very heterogeneous systems.

关键词： Motor transportation

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Constrained dynamic traffic grooming in WDM mesh networks with link bundled auxiliary graph model

Constrained dynamic traffic grooming in WDM mesh networks wi...

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IEEE Workshop on High Performance Switching and Routing

作者： Wang Yao B. Ramatnurthy Department of Computer Science and Engineering University of Nebraska-Lincoln Lincoln NE USA University of Nebraska System Lincoln NE US Dept. of Comput. Sci. & Eng. Nebraska Univ. Lincoln NE USA

This paper addresses the two-layer routing problem in wavelength division multiplexed (WDM) optical mesh networks subject to resource constraints and generalized wavelength continuity (GWC) constraint. The GWC constraint is a relaxed wavelength continuity constraint in networks which have different kinds of wavelength conversion capabilities. As an improvement over the existing approach which represents each wavelength separately in the auxiliary graph, we introduce a largely simplified link bundled auxiliary graph (LBAG) and propose a new,method to find paths and assign wavelengths for new lightpaths subject to the GWC constraint. We propose a constrained grooming algorithm based on the LBAG model. We also propose two grooming policies which improve the existing grooming policies by integrating the wavelength and transceiver metrics and considering the relative resource utilization ratio. Simulations are conducted to evaluate the performance of the grooming policies in terms of blocking probability.

关键词： Telecommunication traffic Traffic control Wavelength division multiplexing WDM networks Mesh networks Optical wavelength conversion Wavelength routing Optical fiber networks Transceivers Resource management

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Using enhancing signals to improve specificity of ab initio splice site sensors

Using enhancing signals to improve specificity of ab initio ...

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Proceedings of the IEEE Computational systems Bioinformatics Conference, CSB

作者： A. Tchourbanov H.H. AIi J. Deogun Department of Computer Science University of Nebraska at Omaha Omaha NE USA University of Nebraska System Lincoln NE US Dept. of Comput. Sci. Nebraska Univ. Omaha NE USA Department of Computer Science and Engineering University of Nebraska-Lincoln Lincoln NE USA

In this paper, we describe a new approach to improve the precision of splice site annotation in human genes. The problem is known to be extremely challenging since the human splice signals are highly indistinct and frequent cryptic sites confuse signal sensors. There is a strong evidence that exonic splicing enhancers (ESE) and exonic splicing silencers (ESS) influence commitment to splicing at early stages. We propose the use of a naive Bayesian network (BN) combined with Boltzmann machine splice sites sensor, to improve the specificity of splice site prediction. The SpIiceScan program is implemented to demonstrate feasibility of specificity enhancement based on ESE/ESS signals interactions. SpliceScan is more sensitive than GeneSplicer and NNSplice for the same specificity. The designed method is of particular value for ab initio gene annotation.

关键词： Splicing Electronic switching systems Humans computer sci.nce Proteins Signal processing Strontium Testing Performance evaluation Educational institutions

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A novel program-erasable capacitor using high-/spl kappa/ AlN dielectric

A novel program-erasable capacitor using high-/spl kappa/ Al...

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Device Research Conference

作者： C.H. Lai M.W. Ma C.F. Cheng A. Chin S.P. McAlister C.X. Zhu M.F. Li D.L. Kwong Department of Electronics Engineering National Chiao Tung Univ. Nano Sci. Tech. Center University System of Taiwan Hsinchu Taiwan National Research Council Canada Ottawa Canada Si Nano Device Laboratory Department of Electrical & Computer Engineering National University of Singapore Singapore

We demonstrate, for the first time, a novel high-/spl kappa/ AlN capacitor that can be program-erasable at voltages of /spl plusmn/4 V and that has good retention for 1T1C memory. These features are not shown by Al/sub 2/O/sub 3/, or other known single high-/spl kappa/ layer capacitors. Good data retention occurs with a threshold change of only 0.06 after /spl plusmn/4 V P/E for 10/sup 4/s and shows potentially long memory time.

关键词： Capacitors Dielectrics MONOS devices Random access memory Electron traps Capacitance-voltage characteristics Phase change materials Nonvolatile memory Voltage Charge carrier processes

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Low workfunction fully silicided gate on SiO/sub 2//Si and LaAlO/sub 3//GOI n-MOSFETs

Low workfunction fully silicided gate on SiO/sub 2//Si and L...

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Device Research Conference

作者： D.S. Yu A. Chin B.F. Hung W.J. Chen C.X. Zhu M.-F. Li S.Y. Zhu D.L. Kwong Department of Electronics Engineering Nano Sci. Tech. Center Univ. System of Taiwan National Chiao Tung University Hsinchu Taiwan Dept. of Electronics Eng. Univ. System of Taiwan Hsinchu ROC Taiwan ROC Graduate Inst. of Materials Eng. National Pingtung University of Science and Technology Pingtung Taiwan Dept. of Electrical & Computer Eng. National Univ. of Singapore Singapore Dept. of Electrical & Computer Eng. National Univ. of Singapore Singapore Singapore Dept. of Electrical & Computer Engineering The Univ. of Texas Austin TX USA

The main challenges for metal-gate/high-k CMOS are to find dual workfunction gates and robust high-k dielectrics. The low workfunction metal-gate for n-MOS is especially difficult since it reacts with oxygen rapidly and is hard to form a silicide or nitride. We have successfully developed 4.2 and 4.3 eV low workfunction NiSi:Hf and NiTiSi gates that were integrated onto SiO/sub 2//Si, novel high-k LaAlO/sub 3//Si and LaAlO/sub 3//GOI n-MOSFETs. The Hf or TiSi is for low workfunction control and the NiSi is for low resistivity.

关键词： MOSFET circuits Artificial intelligence Voltage Capacitors Capacitance-voltage characteristics Electron mobility

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Nano-scale MOSFETs with programmable virtual source/drain

Nano-scale MOSFETs with programmable virtual source/drain

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Device Research Conference

作者： Byung Yong Choi Yong-Kyu Lee Woo Young Choi Han Park Dong-Soo Woo Jong Duk Lee Byung-Gook Park Chang-Woo Oh Chilhee Chung Donggun Park Inter university Semiconductor Research Center Seoul National University Seoul KOREA Seoul National University Gwanak-gu Seoul KR Sch. of Electr. Eng. & Comput. Sci. Seoul Nat. Univ. South Korea Device Research Team R&D Center Samsung Electronics Company Limited Yongin si Gyeonggi South Korea C&M System LSI Samsung Electronics Company Limited Yongin si Gyeonggi South Korea Device Research Team Samsung Electronics Co. Yongin-City Kyunggi-Do KOREA Inter-University Semiconductor Research Center and School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea C&M . System LSI Samsung Electronics Co. Yongin-City Kyunggi-Do KOREA

ISBN: (纸本)0780382846

In this work, we fabricated twin silicon-oxide-nitride-oxide-silicon (SONOS) memory (TSM) cell transistors, based on the 90 nm non-volatile memory technology and showed the implementation of programmable threshold voltage (V/sub th/) MOSFETs in the nano-scale regime. It was clearly observed that the transistor has high I/sub on//I/sub off/ ratio (>106) and small drain leakage (/spl sim/10 pA) in the 30 nm regime. From the experimental result from fabricated devices, it can be deduced that the TSM transistor has various MOSFET applications due to charged states in the nitride. To evaluate the various MOSFET applications of the TSM transistor in the nano-scale regime, the simulation of a 30 nm-long gate TSM transistor was carried out on the 2D ATLAS, including tunneling and impact ionization models. It is concluded that the proposed TSM MOSFET structure promises a well-controlled short channel effect and high I/sub on//I/sub off/ characteristics.

关键词： MOSFETs Nonvolatile memory SONOS devices Charge carrier processes Electrons computer sci.nce Electronic mail Large scale integration Research and development Transistors

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An intelligent stock trading system based on reinforcement learning

An intelligent stock trading system based on reinforcement l...

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作者： Won Lee, Jae Kim, Sung-Dong Lee, Jongwoo Chae, Jinseok Sch. of Comp. Sci. and Engineering Sungshin Women's University Seoul 136-742 Korea Republic of Dept. of Computer System Engineering Hansung University Seoul 136-792 Korea Republic of Department of Computer Engineering Kwangwoon University 447-1 Wolkye-dong Nowon-gu Seoul Korea Republic of Dept. of Comp. Sci. and Engineering University of Incheon Incheon 402-749 Korea Republic of

This paper describes a stock trading system based on reinforcement learning, regarding the process of stock price changes as Markov decision process (MDP). The system adopts two popular reinforcement learning algorithms, temporal-difference (TD) and Q, for selecting stocks and optimizing trading parameters, respectively. Input features of the system are devised using technical analysis and value functions are approximated by feedforward neural networks. Multiple cooperative agents are used for Q-learning to efficiently integrate global trend prediction with local trading strategy. Agents communicate with others sharing training episodes and learned policies, while keeping the overall scheme of conventional Q-learning. Experimental results on the Korean stock market show that our trading system outperforms the market average and makes appreciable profits. Furthermore, we can find that our system is superior to a system trained by supervised learning in view of risk management.

关键词： Information analysis

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