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An Improvement Method of the Speech Quality by Pitch Compensation in Transition Region in G.723.1

An Improvement Method of the Speech Quality by Pitch Compens...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： J.K.KIM M.J.BAE

G.723.1 uses pitch and gain coefficient for periodicityof speech and LSP(line spectrum pairs) coefficient for ***, this encoder processes without considering differencebetween stable and unstable speech region, especially transientregion. Therefore, it is impossible to detect exact pitch in transitionregion. So, speech degradation is produced. In this paper, we propose the new algorithm that improvesspeech quality in *** detecting exact pitch in transitionregion. First of all, we decide threshold of pitch gain coefficient instable region by using pitch gain coefficient from G.723.1. If pitch gain coefficients exceed threshold value, pitch gaincoefficient is recalculated by controlling before and after 10sample. And then pitch gain coefficient closed to the thresholdvalue is determined. After this processing, pitch and pitch gaincoefficient are coded. As a result, segSNR(segmental Signal to Noise) and MOS (MeanOpinion Score) are improved average 1.630(dB), 0.277(MOS)respectively.

关键词： G.723.1 codec speech quality distortion pitch pitch predictor

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Integration of Process and Project Management System

Integration of Process and Project Management System

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Li Qing Chen Yuliu Wang Qing Department of Automation, Tsinghua University, Beijing 100084, China

With the development of system integration,business process modeling, analyzing andreengineering play key roles in enterprise *** are several kinds of process modeling methodsincluding IDEF3, ARIS, RAD and DFD, etc. However,none of them can give a satisfactory methodologicalmethod to do process analysis. At the same time,developing the work breakdown structure (WBS) andthe schedule of a complex project is a hard work. Inthis paper, an integrating framework of processmanagement and project management is *** an information mapping method between them ispresented. Based on above framework and method, itwill be easy for us to get WBS easily for projectmanagement and at the same time, project managementmethod can help us do process analysis andreengineering, with which process management andproject management system can be integrated.

关键词： process modeling analysis Gantt chart project management

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Diverse Restoration Requirements guaranteed Shared Recovery Scheme in optical mesh networks

Diverse Restoration Requirements guaranteed Shared Recovery ...

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Jung YulChoi Minho Kang Optical Internetworking Lab. Information and Communications University P.O.Box 77 Yusong Daejon (305-732) Optical Internetworking Lab. Information and Communications University P.O.Box 77 Yusong Daejon (305-732)

In this paper we propose a novel sharedrecovery scheme, which is cost efficient restoration, to satisfydiverse restoration requirements by introducing multipleclasses in IP over WDM networks. First, we classify the classof restoration for a lightpath setup request at an ingress *** we calculate the backup route for the requestedlightpath and reserve the spare resource which shares amongthe backup paths with different class. We also propose thesharing group (SG) concept based on wavelength manager(WM) to efficiently manage wavelengths on each link Thediverse restoration requirements are satisfied in terms ofrestoration time and blocking rate according to the given threeclasses.

关键词： WDM Diverse Restoration Requirements guaranteed Shared Recovery Scheme in optical mesh networks

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OWNERSHIP MANAGEMENT IN DISTRIBUTED COLLABORATIVE APPLICATIONS USING HLA

OWNERSHIP MANAGEMENT IN DISTRIBUTED COLLABORATIVE APPLICATIO...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： Mey Ling Ting Stephen J.Turner School of Computer Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 School of Computer Engineering Nanyang Technological University Nanyang Avenue Singapore 639798

The High Level Architecture (HLA) is an architecturethat supports reuse and interoperability of components ina distributed simulation or virtual world. This paperdescribes the design of a distributed shared whiteboardusing the HLA. Users across a distributed computernetwork are able to interact through the whiteboard using"scribble" objects. An important consideration in such anapplication is the ownership of objects. To ensureconsistency, the distributed whiteboard is designed insuch a way that only the owner of a scribble object isallowed to update or delete it. At the same time, anychanges made should be reflected in the remote scribbleobjects of the other users. To fully utilize the capability ofthe whiteboard as a medium of communication, transferof ownership of the scribble objects among the users isrequired. This paper shows how the ownership transfermechanisms may be implemented easily using the HLA.

关键词： distributed collaborative work high level architecture ownership transfer locking

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An Empirically Based Path Loss Model for Indoor Wireless Channels in Laboratory Building Supachai Phaiboon

An Empirically Based Path Loss Model for Indoor Wireless Cha...

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Department of Electrical Engineering. Faculty of Engineering Mahidol University Salaya, Phuthamonthon, Nakornprathom 73170, Thailand Department of Electrical Engineering.Faculty of Engineering Mahidol University Salaya Phuthamonthon Nakornprathom 73170 Thailand

This paper present a statistical indoor path loss modelderived from 1.8 GHz experimental data collected inlaboratory building. There are two models which areconsidered, 1) Distance-dependent path loss model and 2)Floor attenuation, factor (FAF) path loss *** have been developed based on the number of floors,concrete and mirror walls between the transmitter and thereceiver, and provide simple prediction rules which relatesignal strength to the log of distance. The standarddeviation between measured and predicted path loss is 8.7dB for the entire data *** floor attenuation factors(FAF), which describe the second path loss (in decible)caused by floors between transmitter and receiver are foundfor as many as three floors in the typical building.

关键词： Indoor Path Loss Models Linear Regression Laboratory building

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Reliable and Smooth Fine Granular Scalable Video Streaming

Reliable and Smooth Fine Granular Scalable Video Streaming

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： Zhibo Chen Yun He State Key Lab on Microwave and Digital Communications Dept. of Electronic Engineering, Tsinghua University, Beijing, 100084

For streaming applications over Internet, reliable and smoothplayback over unreliable and time-varying channel is always acause of significant concern. Thus in this paper one streamingserver architecture together with a Quality Weighted ControlScheme (QWCS) based on MPEG-4 version-4 is proposed forFine Granular Scalable (FGS) video streaming. There are twoparts in our scheme: Quality Weighted Bit Allocation (QWBA)and Quality Weighted Error Control (QWEC). QWBA is able toachieve a consistent playback quality by allocating enhance-layer stream based on a theoretical analysis. And a prioritydefinition considering both layer and quality factors is firstproposed in QWEC which provides fine grained loss protectionstrategy for FGS stream as well as a better tradeoff betweenprefetching and retransmission. Simulation results show theexcellent performance of our scheme on both pecket-lossresilience and playback quality smoothness.

关键词： QWCS QWBA QWEC FGS video streaming reliable smooth

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AN EFFICIENT SCHEDULING METHOD FOR WEEKLY HYDRO-THERMAL UNIT COMMITMENT

AN EFFICIENT SCHEDULING METHOD FOR WEEKLY HYDRO-THERMAL UNIT...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： M.IGUCHI S.YAMASHIRO Kitami Institute of Technology 165 Koen-cho Kitami Hokkaido Japan Kitami Institute of Technology 165 Koen-cho Kitami Hokkaido Japan

This paper proposes a practical schedulingmethod of bydro-thermal unit commitment taking intoaccount the transmission network The propoed techniqueincludes a multi-stage screening algorithm for processingthe operation constraints and a heuristic approach toobtain a feasible solution efficiently. At first stage, wedecide an initial schedule by relaxing various operationconstraints of the thermal units and hydro plants. Secondstage processes the thermal unit operation constraints ofthe spinning reserve and minimum up and down timeconsidering the hydro system operation. At final stage, wescreen the violation of reservoir storage constraints ofhydraulically coupled plants. In each stage, an optimal DCpower flow is carried out for the calculation oftransmission losses. The application results for a model power systemincluding 53 buses, 12 thermal units and 24 hydro plants of7 rivers show the effectiveness of the proposed method.

关键词： AN EFFICIENT SCHEDULING METHOD FOR WEEKLY HYDRO-THERMAL UNIT COMMITMENT MDT

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A NEW NOISE REDUCTION METHOD FOR CHAOTIC SIGNALS:IMPROVED LOCAL-PROJECTION ALGORITHM

A NEW NOISE REDUCTION METHOD FOR CHAOTIC SIGNALS:IMPROVED LO...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： Yang Zongkai Zheng Lin Hu Jing Dept. of E.I. -HuaZhong University of Science and Technology 430074 Wuhan, China

This paper addresses the problem of noisereduction for chaotic signals. There's no efficient way todirect noise filtering process until now. This is why somenoise reduction methods always face to the trade-offbetween distorting original chaotic signal or holdingrelatively more noise in filtered signal. On the basis ofextensive analysis of local correlation of the chaoticdynamic system, a new method for analyzing signal'sdeterministic degree is given. A parameter D being verysensitive to noise is introduced and used to show howdeterministic the system is. With help of parameter D, weimprove our former local-projection noise reductionmethod. Numerical results show the efficiency of the newmethod. Since this method does not require priorknowledge for the underlying dynamic system, it is a kindof practical method satisfying engineering demand.

关键词： noise reduction deterministic chaotic dynamic system local-projection algorithm

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CURRENT CHALLENGES & TRENDS OF INTERACTIVE MULTIMEDIA IN ENHANCING ENGINEERING EDUCATION

CURRENT CHALLENGES & TRENDS OF INTERACTIVE MULTIMEDIA IN ENH...

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Manjit Singh Sidhu N.Selvanathan Diljit Singh S.Ramesh Dept. of Computer Science & IT University Tenaga Nasional 43009 Kajang Selangor Malaysia Dept. of Computer Science & IT University Tenaga Nasional 43009 Kajang Selangor Malaysia Dept. of Computer Science & IT University Tenaga Nasional 43009 Kajang Selangor Malaysia Dept. of Computer Science & IT University Tenaga Nasional 43009 Kajang Selangor Malaysia

The use of multimedia computer technology asreplacement, or supplement to, human educators inengineering education is becoming widespread. Suchtechnology can be employed to demonstrate & correlate reallife application and theory thereby promoting deep *** courseware for higher learning institutions may beextremely useful where trained human resources in theengineering education sector are limited. However, althoughmany interactive multimedia systems have been developed,only few of these systems can really be said to be *** paper present an overview of the status of someinteractive techniques commonly used in the colltext ofengineering education and discuss the current trends ofincorporating multimedia technology in the teachingengineering subjects.

关键词： interactivity multimedia deep learning engineering education

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BATTERY-CHARGING MODEL TO STUDY TRANSIENT DYNAMICS OF BATTERY AT HIGH FREQUENCY

BATTERY-CHARGING MODEL TO STUDY TRANSIENT DYNAMICS OF BATTER...

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： CAI Chenghui DU Dong GE Jingtian LIU Zhiyu ZHANG Hua Department of Mechanical Engineering, Tsinghua University, Beijing, China 100084

This paper initially presents a battery-charging modelto describe transient dynamics including inductance characteristicof valve regulated lead acid (VRLA) battery during charging atDC current of high frequency ripple. Next, some formulas areintroduced to determine the values of key elements of batterymodel. which are functions of battery state of charge(SOC). Anda very simple formula is derived to calculate the valus of batteryinductance Z in the model. Then, battery-charging model isverified via comparisons between simulation and laboratorymeasurement of charging transient process. Further simulationstudy shows that battery inductance characteristic has impact onthe working state of high frequency switching mode charger(HFSMC)and parameter selection of the components in outputunit of charger power transfer main circuit can be optimized.

关键词： battery charger battery model inductance characteristic state of charge (SOC)

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