基于流传输控制协议的移动切换研究

传输层的移动SCTP可支持无缝的移动切换，而不需要网络路由器的支持，SCTP的移动切换性能主要是由在关联中加入和改变IP主地址的触发机制决定。本文针对具体的切换实现进行了分析研究，提出了预切换的可行性方案。     

SCTP数据传输过程的技术研究

流控制传输协议(SCTP)是IETF新近提出的一种传输协议,用于在基于IP的网络上传输PSTN信令。本文详细研究了SCTP数据传输过程,特别是SCTP四路握手,并进一步展望了SCTP的发展前景。     

SCTP协议及其应用

随着IP网络的迅速发展，它和电信网络，特别是和SS7信令网的互通已经成为必然的趋势。由于目前的TCP或UDP都不能完全满足通信网中信令承载的要求，因此，IETF在IP层上定义了SCTP(Stream Control Trotocol)，一种新的端到端的传输层协议。本着重介绍了SCTP协议的设计以及应用。     

SCTP在移动IP安全中的应用

移动IP的引入是为了解决终端移动性接入问题,因其存在无线链路和有线链路两部分,使得入侵者不但可以在有线网络部分进行攻击还可以通过无线方式发起攻击。SCTP是IETF为了解决TCP的局限性而构建于IP之上的可靠的传输层协议,它的状态Cookie机制对防御移动IP的DoS攻击具有不可取代的优势,而隧道防火墙则在移动IP中早已经广泛应用。有效将这两种技术进行融合对提高移动IP的数据传输安全具有重要意义。本文在分析SCTP协议特性的基础上,提出了如何实现SCTP与IPSec的融合并应用于移动IP的安全防御中,从而获得更高的安全性能。     

SCTP在军事通信网络中的应用研究

SCTP是INTERNET标准化组织提出的一个新的传输层协议,是新一代构架于IP层之上的提供可靠传输的通用IP传输协议。与TCP、UDP相比,SCTP更能满足未来军事通信网络中的应用。在高丢包率的环境中,SCTP的多流控特性可以减少传输流的延迟,提高传输可靠性,避免队首阻塞。而多址特性可以提高快速移动环境下方便地进行无缝转换,更好地抵御SYN泛洪攻击,支持传输层的多接入并获得可观的网络容错性。凭借这些新特性和相关的改进,SCTP可以进一步提高通信的质量,更好地适应军事网络中多干扰、高度移动以及资源受限的情况。     

SCTP协议及其应用

随着IP网络的迅速发展,它和电信网络,特别是和SS7信令网的互通已经成为必然的趋势。由于目前的TCP或UDP都不能完全满足通信网中信令承载的要求,因此,IETF在IP层上定义了SCTP(stream Control Transport Protocol),一种新的端到端的传输层协议。本文着重介绍了SCTP协议的设计以及应用。     

SCTP数据传输过程的技术研究

流控制传输协议（SCTP）是IETF新近提出的一种传输协议，用于在基于IP的网络上传输PSTN信令。本详细研究了SCTP数据传输过程，特别是SCTP四路握手，并进一步展望了SCTP的发展前景。     

基于SCTP多数据流特性的WEB传输

SCTP是为了在IP网络中传输基于消息的SS7信令而开发的传输层协议，它是可靠的，面向消息的协议。SCTP具有很多新的特点，在对SCTP的多数据流特性研究的基础上，提出使用多数据流特性进行WEB传输的机制，仿真结果的分析表明，使用SCTP来进行WEB的传输比TCP更加可靠，速度更快。     

SS7 over IP的关键技术SCTP概述

介绍了SCTP在信令传输中的使用，随后就SCTP的基本特性、分组格式和协议行为进行了阐述。     

SCTP应用于SIP消息传送的研究

简单介绍了SCTP协议的结构和内部功能以及SIP的会话过程．分析了SCTP适用于SIP传输层协议的特性,最后给出了SCTP应用于SIP的参数扩展及SIP消息到SCTP流的映射方式。     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first