恒压源驱动下的扬声器低频跳跃

通过能量法求解扬声器非线性振动系统的非线性微分方程的一阶近似解，得出幅频关系方程和幅频关系曲线，并着重分析讨论磁场的非线性对扬声器低频跳跃的影响，得出一些结论。     

一种超低副瓣非线性调频脉压信号的性能分析

根据非线性调频函数的调频曲线，拟合出一种新的调频函数曲线，使该函数在定义域内的值及其一、二阶导数与调频S曲线高度一致。据此提出调频函数的假设数学模型，将线性调频信号与非线性调频信号统一起来。采用Matlab软件对该模型的脉压过程进行了仿真，同时对基于该函数的脉压性能进行了分析和讨论。最后，简单介绍了这种信号在空管雷达领域的应用。     

Web服务技术在非线性编辑网络中的应用研究

本文对目前非线性编辑网络系统在软件体系结构方面普遍存在的不足进行了分析，然后提出采用Web服务技术对目前的非线性编辑网络系统进行改进．从而提高系统的可维护性和支持异种平台的能力，并给出了主要系统功能Web服务的定义和调用方法。     

PZT非线性特性的研究

对ＰＺＴ的非线性特性进行了理论和实验研究，给出了施加不同电压时ＰＺＴ机电耦合特性的实验曲线，详细讨论了施加电压过程与所产生的机械变形之间的关系。最后根据实验结果给出了ＰＺＴ用作执行元件时的线性工作区、非线性工作区和截止区。     

移动环境中应用区分服务模型的探讨

区分服务模型是一种在固定Internet中提供服务质量保证的服务模型，但是它并不是为移动环境设计的，特别是当采用移动IP作为移动管理协议时，区分服务模型会引起一系列问题。本文讨论和分析了移动环境下区分服务模型存在的问题，并且提出了一些解决方案。     

企业网的目录服务

本文讨论了在企业网环境下使用目录服务的意义，作用和标准，并简单地介绍了Ｘ．５００标准的内容，本文还以当前处于国际先进水平的Ｎｏｖｅｌｌ公司的目录服务ＮＤＳ为例，讨论了目录服务的一些实现问题及其它对企业网应用的重要作用。     

基于P2P网络之上移动agent的Web服务发现机制

分析了传统服务发现机制存在的问题，针对移动嵌入式环境，提出了基于P2P之上移动agent的Web服务发现机制，讨论了其体系结构和工作模型设计的关键技术。     

Internet区分服务模型及其实现策略

区分服务模型是IETF提出的用于在Internet上支持QoS的重要机制。首先识别了区分服务模型提出的背景，然后讨论了区分服务模型的技术特点和研究现状，最后详细阐述了区分服务研究和实现的各个方面，并对区分服务的应用前景提出了一些看法。     

高校图书馆一站式服务优势与形式探索

结合沈阳音乐学院图书馆实际情况讨论了“一站式”服务对高校图书馆服务功能的提升，以及高校图书馆利用自己的馆藏特色、读者群特色、高校的专业特色对“一站式”服务的形式与内容进行更多的探索与发掘，同时将“一站式”这一服务理念运用到了图书馆的日常管理中。     

用VFP开发基于Web服务架构的应用系统

介绍了Web服务的基本概念、原理与特点。重点以实例方式讨论了如何用VFP编写与发布Web服务，如何应用VFP描写Web服务客户端程序，文中给出了几个具体的例子。     

CORBA Notification Service and RSVP-Based Architecture to Provide QoS Guarantees

CORBA is an object-oriented middleware defined by the OMG. It is designed to support the development of distributed applications by separating interfaces from implementations. Unfortunately, CORBA does not consider QoS requirements inherent to new applications such as teleconferencing and telecommunication services. The Resource reSerVation Protocol (RSVP) is an IETF protocol that allows real-time applications to reserve necessary resources at routers along the transmission paths, so the requested bandwidth can be available when transmission actually takes place. In this paper, we discuss the use of Notification Service and RSVP to provide end-to-end QoS to applications supported by CORBA architecture.     

Quality-of-service mechanisms in all-IP wireless access networks

In this paper, we focus on resource reservation protocol (RSVP)-based quality-of-service (QoS) provisioning schemes under Internet protocol (IP) micromobility. We consider QoS provisioning mechanisms for on-going RSVP flows during handoff. First, the rerouting of RSVP branch path at a crossover router (CR) at every handoff event can minimize resource reservation delays and signaling overheads, and in turn the handoff service degradation can be minimized. We show that RSVP branch path rerouting scheme could give a good tradeoff between the resource reservation cost and the link usage. Second, the new RSVP reservation can be made along the branch path toward the CR via a new base station in advance, while the existing reservation path is maintained, and in turn the on-going flow can be kept with the guaranteed QoS. We also show that seamless switching of RSVP branch path could provide the QoS guarantee by adaptively adjusting the pilot signal threshold values. Third, during RSVP resource reservation over wireless link, dynamic resource allocation scheme is used to give a statistical guarantee on the handoff success of on-going flows. We finally obtain the forced termination probability of guaranteed service flows, the average system time of best effort flows by using a transition rate matrix approach.     

充满活力的下一代网络技术--RSVP

近年来，随着经济的发展和计算机的普及，Internet业务出现了爆炸性的增长，并且出现了许多新兴的业务，如IP电、话、视频点播、视频会议等，现有Internet只提供传统单一尽力传送（best—effort）业务，因而急需新的网络协议以支持未来分类业务所需的不同带宽和服务质量（QoS）保障，现有网络虽然可以通过ATM（Asynchronous Transfer Mode）来解决QoS问题。但由于ATM信元的开销在整个帧中占了30％，严重降低了网络的传输效率，故未来网络不可能使用它。新出现的RSVP（资源预留协议）根据其自身的特点，必然会替代ATM，成为下一代网络保证QoS的关键网络技术。下面详细介绍RSVP的特点以及它如何有效的与未来的IPv6相结合。     

Optimal smoothing for guaranteed service

We consider the transmission of variable bit rate (VBR) video over a network offering a guaranteed service such as ATM VBR or the guaranteed service of the IETF. The guaranteed service requires that the flow accepted by the network has to be conforming with a traffic envelope σ; in return, it receives a service guarantee expressed by a network service curve β. Functions α and β are derived from the parameters used for setting up the reservation, for example, from the T-SPEC and R-SPEC fields used with the resource reservation protocol (RSVP). In order to satisfy the traffic envelope constraint, the output of the encoder is fed to a smoother, possibly with some look-ahead. The resulting stream is transported by the network; at the destination, the decoder waits for an initial playback delay and reads the stream from the receive buffer. We consider the problem of whether there exists one optimal strategy at the smoother which minimizes the playback delay and the receive buffer size, given the traffic envelope α and the service curve β. We show that there does exist such an optimal smoothing, and give an explicit representation for it. We also obtain a simple expression for the smallest playback delay and playback buffer size which can be achieved over all possible smoothing and playback strategies. We show that the computation of optimal smoothing and minimum playback delay do not depend on the past. We show that separate delay equalization is optimal in the constant bit rate (CBR) case, but not otherwise. We also apply the theory to the analysis of which T-SPEC should be requested by a source-destination pair, given some playback delay and buffer constraint, and given the path characteristics advertised in RSVP PATH messages     

Multicast for RSVP switching: An extended multicast model with QoS for label swapping in an IP over ATM environment

The ubiquity of IP associated with the acknowledgment of ATM as a key switching technology has motivated an increasing interest towards the design of a more efficient way of operating IP over ATM networks. This approach is known under the name Label Swapping. A few studies have addressed the primary issue of providing simultaneously quality of service and multicast. We propose a solution where we mix an RSVP architecture with one Label Swapping technique called IP Switching. We discuss problems that arise when using cut-through associated with an RSVP multicast model and propose an application for an IPv6 environment over an ATM switching hardware.     

An optimal service curve allocation scheme based on RSVP signaling protocol

An optimal service allocation scheme that can be used in RSVP (ReSerVation Protocol) signaling protocol is proposed to admit real-time sessions with deterministic delay bounds as many as possible. The big merit of our scheme is that it operates in the framework of RSVP, which is recommended by the IETF.     

Reliable RSVP path reservation for multimedia communications under an IP micromobility scenario

We focus on how quality of service (QoS) guarantees can be provided for RSVP flows during handoff events in an IP micromobility network. For this purpose, RSVP message delays and signaling overheads should be minimized, and handoff service disruption should also be minimized. By rerouting the RSVP branch path at a crossover router at every handoff event, and establishing the new RSVP path between the CR and new BS in advance while the existing reservation path is maintained, ongoing RSVP flows can be kept with the guaranteed QoS. We propose the seamless switching of an RSVP branch path for soft handoff, and also show that this scheme could provide QoS guarantee with simulation and examples.     

应用RSVP提高视频会议系统业务传输质量

传统的IP网络基于尽力而为的设计思想,不对上层承载业务提供任何服务质量保障。而视频会议应用对服务质量要求相对严格,延迟及延迟抖动会降低用户的应用体验。针对基于IP网络的视频会议系统中缺少服务质量保障的问题,提出了在视频会议系统中部署资源预留协议以提供服务质量保障的方案,并且在Vxworks系统中完成资源预留协议的开发。为了验证方案效果,分别在中度负载和重度负载的情况下对业务性能进行测试。测试结果表明,该方案能够为视频会议系统提供有效的服务质量保障。     

RSVP and integrated services in the Internet: a tutorial

The growing use of multimedia communication applications, with specific bandwidth and real-time delivery requirements has created the need for an integrated services Internet in which traditional best-effort datagram delivery can coexist with additional enhanced quality of service (QoS) delivery classes. Such classes provide data flows with QoS commitments with regard to bandwidth, packet loss, and delay through the reservation of network resources along the data path, which can be done using the Resource Reservation Protocol (RSVP). This article is a tutorial on how RSVP can be used by end applications to ensure that they receive the end-to-end QoS that they require     

支持IPv6／RSVP的网络中基于数字视频的教育服务

为了保证基于数字视频的教育服务的网络的服务质量,更好地提升Internet的网络性能,使综合数据的传输更加流畅,将IPv6相对于IPv4的优势和RSVP对的QoS支持两方面结合起来,提出了支持IPv6／RSVP的网络中基于数字视频的教育服务的基本设计思想、系统总体框架结构与技术实现,并给出了视频教育服务体系结构、通信协议栈和资源预留的实现方式。该方法在拟定的实验环境下能实现预期目标,并被证明了有为基于教育服务的视频提供端对端服务质量的可能性。