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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Chen, JRHas files: No

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    Performance evaluation of an end-to-end rate control approach for ABR services
    (1998-12-01)
    Chen, JR
    ;
    Chen, YC
    ;
    Chan, CT
    ;
    資訊工程學系
    ;
    Department of Computer Science
    In this work, we propose an End-to-End Rate Control Approach (EERCA) for congestion avoidance in Available Bit Rate (ABR) service on Asynchronous Transmit Mode (ATM) networks. In our approach: the network estimates the number of cells stored in the switch for each VC. The source generates a specific traffic pattern, then a proper explicit rate can be derived based on the received traffic pattern at the destination. This approach is designed to reduce the rate calculation effort in the switch as well as to avoid the complexity in setting the monitoring-interval. EERCA features higher efficiency, higher utilization, more stable queue occupancy shorter transient response time, and better fairness compared with existed schemes.
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    Performance evaluation of an end-to-end rate control approach for ABR services
    (1998-12-01)
    Chen, JR
    ;
    Chen, YC
    ;
    Chan, CT
    ;
    資訊工程學系
    ;
    Department of Computer Science
    In this work, we propose an End-to-End Rate Control Approach (EERCA) for congestion avoidance in Available Bit Rate (ABR) service on Asynchronous Transmit Mode (ATM) networks. In our approach: the network estimates the number of cells stored in the switch for each VC. The source generates a specific traffic pattern, then a proper explicit rate can be derived based on the received traffic pattern at the destination. This approach is designed to reduce the rate calculation effort in the switch as well as to avoid the complexity in setting the monitoring-interval. EERCA features higher efficiency, higher utilization, more stable queue occupancy shorter transient response time, and better fairness compared with existed schemes.
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    Design and analysis of queuing delay control for end-to-end rate control algorithm
    (1999-10-01)
    Chen, JR
    ;
    Chen, YC
    ;
    資訊工程學系
    ;
    Department of Computer Science
    distributed congestion avoidance scheme, the End-to-End Rate Control Algorithm (EERCA), has been proposed [5] for Available Bit Rate (ABR) service. In this work, we enhance EERCA by replacing the Queue Occupancy Reduction with the queuing delay control (QDC), which manipulates the queue occupancy more efficiently with less functional complexity. Furthermore, it alleviates per-VC accounting requirement and thus reduces the complexity of a switch. From both the analysis and the simulation, it shows that the proposed virtual queue occupancy precisely reflects the variation of the actual queue occupancy. This enhanced EERCA features higher efficiency and more stable queue occupancy than the original algorithm.
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    Providing service differentiation in wireless networks
    (2001-04-01)
    Lee, CL
    ;
    Chen, YC
    ;
    Chen, JR
    ;
    資訊工程學系
    ;
    Department of Computer Science
    Differentiated services: (Diffserv) model is one of the possible solutions for providing quality of service (QoS) on the Internet. Most existing approaches assume that the packet loss is an indication of network congestion and thus reduce the sending rates: of sources. For wireless networks, the assumption is not proper since packet losses may he caused by other reasons, such as fading and interference of the signal. Therefore, these approaches do not work well in wireless networks. In this paper, we propose an approach which is able to provide service differentiation in wireless environments. In our approach, the rate share of a connection is determined by the associated weight. By keeping a proper amount of extra data in the network, the proposed approach can achieve weighted proportional fairness, which can provide selective QoS without any particular support, from the network. We use the ns simulator to evaluate our approach. Simulation results show the validity of the proposed approach.
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    Synthesis and physical properties of linear and branch phenoxies
    (2001-12-01)
    Chen, JR
    ;
    Li, YS
    ;
    Chang, FC
    ;
    應用化學系
    ;
    Department of Applied Chemistry
    Linear and branch phenoxies have been synthesized by reacting difunctional epoxy and diphenol or triphenol monomer, using phosphonium salt as the catalyst. The reaction kinetics is analyzed by the ASTM E 698 method, which is suitable for a first order reaction system. The bulky structure of the bisphenol Z moiety retards the reaction; therefore, the reaction temperature required is higher- at 200 degreesC, compared to 190 degreesC for the bisphenol A based system. The introduction of a branch structure increases both molecular weight and the polydispersity of the phenoxy. A slightly branched structure tends to increase the distance between the polymer chains and results in a lower shear viscosity for easier processing. A higher branch results in light crosslinking and decreases the mobility of the polymer. The branch structure has a negligible effect on its glass transition temperature because the average distance between branches is substantially longer than the critical mainchain length for T-1's Brownian motion. The 100/1 (bisphenol/ trisphenol) system has the lowest viscosity, but its mechanical properties and the gas permeation properties are poorer than those of the others. The bisphenol Z based phenoxy shows superior mechanical properties, higher T-g, lower coefficient of thermal expansion, and lower gas permeation properties than the corresponding bisphenol A based phenoxy because of the steric hindrance structure of the bisphenol Z moiety.
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    Automated information. mining on multimedia TV news archives
    (2005)
    Lai, PS
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    Cheng, SS
    ;
    Sun, SY
    ;
    Huang, TY
    ;
    Su, JM
    This paper addresses an integrated information mining techniques for multimedia TV-news archive. The utilizes techniques from the fields of acoustic, image, and video analysis, for information retrieval on news story title, newsman and scene identification. The goal is to construct a compact yet meaningful abstraction of broadcast news video, allowing users to browse through large amounts of data in a non-linear fashion with flexibility and efficiency. By using acoustic analysis, the system can classify video into news versus commercials, with 90% accuracy on a data set of 400 hours TV-news recorded off the air from July 2003 to August of 2004. By applying speaker identification and/or image detection techniques, each news stories can be segmented with an accuracy of 96%. On screen captions or subtitles are recognized by OCR techniques to produce the text title of each news stories. The extracted title words can be used to link or to navigate more related News contents on the WWW. In cooperation with facial and scene analysis and recognition techniques, OCR results can provide users with multimodality query for specific news stories. Some experimental results are presented and discussed for the system reliability and performance evaluation and comparison.
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    A distributed end-to-end rate control scheme for ABR service
    (1998)
    Chen, JR
    ;
    Chen, YC
    ;
    Chan, CT
    ;
    資訊工程學系
    ;
    Department of Computer Science
    In ATM networks, the ABR service allows both the source and the destination to function simply, this means that we may need a certain complexity in the switch. To provide robust ABR service, policing and discarding functions are usually required. ABR rate control schemes such as UT [4] and OSU [5][7] can achieve high utilization, but they suffer the oscillation of transmission rate. We propose an End-to-End Rate Control Algorithm (EERCA), which performs the monitoring function in end systems, and achieves max-min fairness naturally. Our scheme relies on the round-robin discipline in combination with per-VC queuing for cell scheduling, it also covers the policing function. EERCA resolves the oscillation problem that is quite common in existing explicit rate schemes, as well as features very low cell loss ratio with much smaller buffer size.
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    Numerical analysis on hot spot in reactive chemical storage
    (1998)
    Sheu, LJ
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    Lin, JD
    ;
    Chen, JR
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    In an exothermic reactive chemical storage, a thermal explosion can occur when the heat generation within the storage is greater than heat removal from the storage. In a solid system, the existence of an inflection point in the temperature versus time curve is often used as a criterion for thermal explosion. In this study the applicability of this criterion to a fluid storage is examined by investigating the hot spot in the system. Transient natural convection of an exothermically reactive fluid in the vertical cylindrical storage tank with isothermal walls is investigated numerically. The axisymmetric 2-D Navier-Stokes equations governing the now fields are reduced by introducing the stream function-vorticity formulation and solved by the alternating-direction-implicit (ADI) technique. The reactive heat sources are represented by a zeroth order rate expression with a Arrhenius type rate constant. It is found that the hot spot is no longer located in the center of the tank due to the buoyancy effect. In a particular range of Rayleigh number and Frank-Kamenetskii number, the hot spot is found to move periodically. A stable steady regime, stable oscillatory regime and thermal explosion regime can be specified based on the dependence of the critical Frank-Kamenetskii number on the Rayleigh number. In the stable oscillatory regime multiple inflections in temperature versus time are found. Therefore, the existing criterion which defines thermal explosion by the appearance of an inflection in the temperature versus time curve is no longer applicable in reactive fluid systems. The results of nonconvective systems do, however, provide a preliminary and conservative estimate for thermal explosion of a reactive storage.
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    A scalable architecture for differentiated services
    (2002)
    Lee, CL
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    Chen, JR
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    Chen, YC
    ;
    交大名義發表
    ;
    National Chiao Tung University
    Differentiated services (DiffServ) model is a potential solution for providing quality of services (QoS) on the Internet. In this paper, we propose a scalable architecture that fulfills the design philosophy of the DiffServ model. Different from other existing architectures, our proposed architecture puts complexity on edge routers so that core routers do not need to support any specific function for service differentiation. Further, the proposed architecture only needs few additional functions in edge routers. Thus its deployment is simpler than most existing architectures. We also address how to achieve weighted proportional fairness solely by edge routers.
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    Effects of isolation materials on facet formation for silicon selective epitaxial growth
    (1997-10-20)
    Tseng, HC
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    Chang, CY
    ;
    Pan, FM
    ;
    Chen, JR
    ;
    Chen, LJ
    Effects of isolation materials on facet formation for low temperature Si selective epitaxial growth (SEG) using Si2H6 have been demonstrated by ultrahigh vacuum-chemical molecular epitaxy (UHV-CME) system. The activation energy of the Si epitaxial growth is 47.35 Kcal/mol. The isolation material includes silicon nitride, wet oxide, and tetraethylorthosilicate (TEOS) oxide. Different isolation materials have different faceting behaviors for the Si epilayer. A silicon nitride mask and a wet oxide mask result in a preferred faceting plane of (111) and (311), respectively. Using a TEOS oxide mask, we obtain a low temperature Si SEG layer without facet and twin formation, The preferred faceting plane orientation for different isolation materials is ascribed to the difference in the interface free energy between the Si layer and the isolation material. (C) 1997 American Institute of Physics.