电信运营商系统集成业务探讨

1 前言 随着社会信息化、网络化程度的不断提高,不同行业的大客户希望电信运营商能够提供满足其多样化、个性化通信需求的一体化解决方案,得到"一站购齐"式的服务,这使得运营商要想取得竞争优势,必须立足自身资源大力开展系统集成业务;另一方面,以IP为代表的数据通信业务迅猛增长,使网络的"中间层"越来越重要.网络要发挥出最大潜能,不仅需要传统的网络管理和维护人员,同时也需要有一支专业化的系统集成队伍提支持.电信运营业正在步入以业务、服务为竞争焦点的时代,如何为客户提供差异化的业务和个性化的服务, 改善客户关系已成为电信运营商亟需解决的课题,而能否开展好系统集成业务也成为衡量电信运营商为客户服务能力的一个重要标志.     

A traffic control method for service quality assurance in an ATMnetwork

The authors describe an ATM traffic control method to avoid both long-term and short-term congestion. Call admission control and policing based on user-specified traffic parameters have mainly been studied as ways to avoid long-term congestion. However, these control methods are not practical since it is difficult for users to specify accurate values of traffic parameters that include the effects of cell collision controllers and multiplexers in the customer premises network. In order to solve the problem, they propose an intelligent call admission control method. This method consists of a function to determine user's traffic parameters by monitoring the cell traffic flow of each service and a function to statistically predict long-term congestion by using Gaussian and Poisson distributions. They show that congestion can be predicted by deriving the peak, average, and variation. They also describe how to derive traffic parameters and determine their values. To avoid short-term congestion, we propose reactive control, which drops cells with lower cell loss priority when congestion occurs, and we show the buffer construction and buffer control algorithm used to achieve this. Computer simulations prove that their control strategy is effective for cell toss sensitive services such as VBR (variable bit rate) video service     

基于多服务一体化的便捷服务系统研究

文章通过研究国内外互联网金融、第三方支付以及众筹的现状,运用了Android+Webservice+My SQL等开发方法设计了一款支付旅游众筹一体化的低风险APP。软件将支付、转账、生活缴费、特色旅游、投资理财等功能完美结合,为降低该软件的风险,使用户的资金更有保障,实现了较合理的风险化控制,并提供了一个合理的第三方评分体系以及风险控制体系,进而降低投资风险,为用户提供更为便捷、安全的服务。     

The parylene-aluminum multilayer interconnection system for wafer scale integration and wafer scale hybrid packaging

Polyimides have been considered as interlayer dielectrics for wafer scale integration (WSI) and wafer scale hybrid packaging (WSHP). However, high temperature curing steps for polyimide lead to large stresses in polyimide films. This is due to differing thermal expansion coefficients of the metal conductor, insulator and substrate materials causing yield and reliability problems. Polyimides also require the use of solvents, and tend to outgas during subsequent processing. They tend to absorb moisture with resulting degradation of dielectric constants. Also, the spin on method used to apply and planarize polyimide layers exhibits nonuniformity of thickness on large wafers. In this paper we examine parylene (Poly-p-xylylene) and some of its derivatives as possible interlayer dielectrics due to some of their attractive features. Parylene has a low dielectric constant. It can be vapor deposited at low temperatures and in vacuum. It is also highly resistant to corrosion and is a clear, transparent material with possible use for optical interconnections. This paper studies the reactive ion etching properties for polyimides and parylenes in an oxygen containing plasma under identical conditions. The etching rates of the parylenes and polyimides have been compared. The surface properties of these polymers are examined. Further, the film growth properties of aluminum deposited on the etched surfaces using the ionized cluster beam are investigated.     

基于CMMI的软件质量保证

为了实现CMMI软件过程和产品质量保证的要求,提高质量活动的规范性和自动化水平,在采用软件质量保证活动实际工程实践结合CMMI软件过程和产品质量保证方法的基础上,建立了适合的软件质量保证流程,实现了一体化的质量保证和质量趋势分析系统。该系统辅助质量保证人员便捷地制定质量保证计划,有效地开展软件过程和产品评价,自动地跟踪不符合项处理情况,生成质量保证报告,准确地描述质量趋势。     

SW-CMM2中的软件质量保证

随着信息技术的发展,软件已成为大多数产品的重要组成部分,如何提高软件质量,使软件更好地服务于各种应用需要,已成为各行各业广泛关注的课题。重点讨论了软件企业或组织实施CMM2中的关键过程域-软件质量保证(SQA)的目的、活动、实施方法和可能遇到的问题。提出了实施SQA的方法和步骤。     

Software surveillance-a buyer quality assurance program

In 1984, Bellcore Software Quality Assurance Engineering (SQAE) was established to assist clients in assuring the quality of software they purchase. The authors present Bellcore SQAE's software quality assurance approach and discuss the objectives and accomplishments of the software surveillance program. They outline a program which focuses on developing a cooperative relationship between the buyer and supplier to successfully meet some of the challenges that face the Bellcore client companies in the 1990s and beyond     

Monolithic integration of multilayer filter on vertical surface ofsemiconductor substrate by a bias-sputtering technique

The selective formation of dielectric film on a vertical surface of a substrate by a bias-sputtering technique is discussed. Using this technique it has been possible to achieve the monolithic integration of a multilayer wavelength filter and waveguide photodetector on a vertical surface of a semiconductor substrate. The wavelength filter can be applied to an integrated demultiplexer and photodetector by fabricating an optical waveguide directly on the substrate     

A policy-based quality of service management system for IP DiffServnetworks

Policy-based management can guide the behavior of a network or distributed system through high-level declarative directives that are dynamically introduced, checked for consistency, refined, and evaluated, resulting typically in a series of low-level actions. We actually view policies as a means of extending the functionality of management systems dynamically, in conjunction with preexisting hard-wired management logic. We first discuss the policy management aspects of architecture for managing quality of service in IP DiffServ networks as presented by Trimintzios et al. (see IEEE Commun. Mag., Special Issue in IP Operations and Management, vol.39, no.5, p.80-88, 2001), and focus on the functionality of the dimensioning and resource management aspects. We then present an analysis of the policies that can influence the dimensioning behavior as well as the inconsistencies that may be caused by the introduction of such policies. Finally, we describe the design and implementation of the generic policy consumer component and present the current implementation status     

基于Web服务的电能质量监测系统的研究

为适应管理部门对电能质量数据的实时掌握、网络共享的发展要求,利用Web服务的跨地域性、跨平台性以及信息传输的快捷和方便性,设计了一种基于Web服务的电能质量实时监测系统,能够实时监测电能质量的各项指标,消除"信息孤岛"现象并给出了系统设计的关键技术,实现电能质量信息共享,满足网络化电能质量监测需求。     

基于Web服务的电能质量监测系统的研究

为适应管理部门对电能质量数据的实时掌握、网络共享的发展要求,利用Web服务的跨地域性、跨平台性以及信息传输的快捷和方便性,设计了一种基于Web服务的电能质量实时监测系统,能够实时监测电能质量的各项指标,消除"信息孤岛"现象并给出了系统设计的关键技术,实现电能质量信息共享,满足网络化电能质量监测需求.     

Real-time scheduling with quality of service constraints

Whether or not the introduction of traffic classes improves upon the performance of ATM networks is discussed within the framework provided by a class of networks that guarantees quality of service. To provide a meaningful comparison the authors define the concept of a schedulable region, a region in the space of loads for which the quality of service is guaranteed. The authors show the dependence of the schedulable region on the scheduling algorithm employed, quality of service parameters, and traffic statistics. An efficient real-time scheduling algorithm is introduced that substantially increases the schedulable region without incurring prohibitive complexity costs. The schedulable region associated with this algorithm is compared with the ones generated by the static priority scheduling algorithm and a variant of the minimum laxity threshold algorithm. The size and shape of the schedulable region is explored by means of simulations     

用SOA与Web Services进行企业集成的框架设计

企业集成技术随着企业信息技术的发展而发展,面向服务的集成(SOI)将是企业集成方法的首选。在介绍Web Services和SOA相关技术后,提出了一种基于SOA和Web Servcies的5层企业IT架构,并较为详细描述了各层的内容。     

Scalable monitoring support for resource management and service assurance

Continuous monitoring of network status and its resources are necessary to ensure proper network operation. Deployment of QoS-based value-added services in IP networks necessitates the employment of resource management techniques and specifically the use of traffic engineering. The latter typically relies on monitoring data for both offline proactive and dynamic reactive solutions. The variety of data to be collected and analyzed using different measurement methods and tools, and the extent of monitoring information to use demand a proper QoS monitoring infrastructure. A monitoring system should be scalable in terms of network size, speed, and number of customers subscribed to value-added services. This article investigates the requirements of scalable monitoring system architectures, proposes principles for designing such systems, and validates them through the design and implementation of a scalable monitoring system for QoS delivery in IP differentiated services networks. Experimental assessment results prove the accuracy and scalability of the proposed monitoring system.     

Software quality assurance: Testing and validation

There are many pitfalls for the unwary hardware engineer who must develop software. In particular, hardware quality control procedures and concepts can easily be misapplied. The purpose of this paper is to help hardware-oriented engineers apply some of the quality assurance lessons learned by software engineers. We first discuss how software is and is not analogous to hardware, and then outline recommended software engineering approaches for developing high-quality software products. We concentrate on methods for preventing and detecting software error.     

All-optical wavelength conversion by semiconductor opticalamplifiers

Following a brief introduction to the applications for wavelength conversion and the different available conversion techniques, the paper gives an in depth analysis of cross gain and cross phase wavelength conversion in semiconductor optical amplifiers. The influence of saturation filtering on the bandwidth of the converters is explained and conditions for conversion at 20 Gb/s or more are identified. The cross gain modulation scheme shows extinction ratio degradation for conversion to longer wavelengths. This can be overcome using cross phase modulation in semiconductor optical amplifiers that are integrated into interferometric structures. The first results for monolithic integrated interferometric wavelength converters are reviewed, and the quality of the converted signals is demonstrated by transmission of 10 Gb/s converted signals over 60 km of nondispersion shifted single mode fiber     

All-optical CDMA with bipolar codes

A method for the transmission and detection of bipolar sequences in a unipolar system is presented. It allows all-optical implementation, in noncoherent optical CDMA systems, of the bipolar codes that have been developed for the radio domain. A practical design is described that encodes the spectrum of a broadband optical source to support a large number of subscribers     

偏振调控全光开关的设计分析

给出了一种工作波长为1550nm,基于电光偏振调控的1×2全光开关的设计方法,该光开关由TE-TM模式转换器和偏振分束光栅构成.通过TE-TM模式转换器控制输出信号光的偏振态,由偏振分束光栅选择输出端口.所设计的全光开关两出射端口的串音分别低于-72dB和-33dB,可实现纳秒量级的开关速率,且串音小、结构简单,在全光...     

A hierarchical multilayer QoS routing system with dynamic SLAmanagement

This paper proposes a hierarchical multilayer QoS routing system with dynamic SLA management for large-scale IP networks. Previously, the promising approach to provide QoS in large-scale IP networks using a mixture of DiffServ-based QoS management and MPLS-based traffic engineering has been actively discussed. However, the introduction of QoS exacerbates the already existing scalability problems of the standard IP routing protocols. In order to address this issue, we propose a new scalable routing framework based on hierarchical QoS-aware path computation. We augment the existing OSPF and CR-LDP protocols to support hierarchical QoS routing, QoS aggregation, and QoS reservation in our MPLS-DiffServ-based hierarchical routing network. In order to provide additional flexibility and cost-efficiency, we augment the network with a policy server which is capable of dynamically handling SLAs between the networks and providing load balancing management within the network. We implement a prototype of the proposed framework and study its performance with a virtual network simulator and specially designed QoS routing algorithm simulator. In our simulations, we evaluate both the implementation complexity and algorithms performance; the results demonstrate the efficiency of the framework and its advantages over the existing proposals