ATM网络拥塞控制的新策略

文章简要介绍了ＡＴＭ网络的虚通路概念和ＡＴＭ网络拥塞产生的原因，分析了现有拥塞控制方案的不足，并通过分析提出了基于虚通路（ＶＰ）改善ＡＴＭ的拥塞控制和新策略。     

ATM宽带网络流量与拥塞控制研究

文章阐明对ＡＴＭ网络进行流量与拥塞控制不仅是由ＡＴＭ网络的分组交换本质所决定，也是实现Ｂ－ＩＳＤＮ的基本要求，文章还对目前ＡＴＭ网络的ＡＢＲ流量与拥塞控制机制进行了评述，提出了ＡＢＲ流量控制尚待解决的一些问题。     

ATM网的业务流控制

ＡＴＭ网络的拥塞现象是ＡＴＭ网推广运用过程中亟待解决的问题。本文对ＡＴＭ网中各种业务流控制方法进行了综述，包括呼叫／连接接纳控制，使用参数控制，选择性丢弃，反应式控制，业务流成形等。     

B—ISDN／ATM网络中的拥塞控制

给出Ｂ－ＩＳＤＮ／ＡＴＭ网络中的业务量类型，描述实时业务量，交互式业务量和成批业务量的拥塞控制，并讨论了用于这种网络的防止性拥塞控制方法。     

OSU速率控制算法

文中介绍了ＡＴＭ网络拥塞控制的方法，着重讲述了基于显速率的拥塞控制方案。并对此方案进行了计算机仿真，给出了仿真结果，从而证明此方案的优越可操作性能。     

ATM网络业务量控制

ＡＴＭ网络的业务量控制是ＡＴＭ网中的关键技术之一。简要介绍了三种业务量控制的方法，即连接接纳控制、业务流警管和ＡＢＲ拥塞控制方法。     

MPEG-2 SNR可分度编码器及其在ATM网络上的应用

在数字图像压缩数据传输的领域，ＭＰＥＧ－２标准的可分度编码算法可以应用于ＡＴＭ网络上的优先级控制方案中，以对网络拥塞进行有效的控制。下文论述了ＭＰＥＧ－２ ＳＮＲ可分度编码器的实现方法和它应用于ＡＴＭ网络分层传输时的优越性。给出的一些实验数据初步说明了它能够在网络发生拥塞时保证基本图像质量。     

ATM网络技术的研究与发展

阐述ＡＴＭ网络发展中遇到的技术问题,包括ＡＴＭ和ＩＰ的融合、话音的ＡＴＭ接入、业务量控制与拥塞控制、无线ＡＴＭ。简述了ＡＴＭ的应用。     

ATM网络技术的研究与发展

阐述ＡＴＭ网络发展中遇到的技术问题,包括ＡＴＭ和ＩＰ的融合、话音的ＡＴＭ接入、业务量控制与拥塞控制、无线ＡＴＭ。简述了ＡＴＭ的应用。     

ATM网络中ABR业务的流量控制

本文讨论了ＡＴＭ网络中ＡＢＲ业务的特性及基于ＡＢＲ业务的拥塞控制机制，了拥塞控制技术的最新发展情况，并比较了各种控制机制的优缺点。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks