地震资料高分辨率中熵的应用

地层的反射系数由地层的结构性质决定,所以任意随机的不同性质地层组合使地层反射系数序列(r i)成为一个随机序列(r i),可以用它的各种统计量来表征。地震的反射系数具有不确定性,所以熵是研究它的有力工具。这样反射系数的频谱形状可以用反射系数频谱的熵来表征,并且验证了频带宽度对地震资料高分辨率的影响。     

Simulation analyses of weighted fair bandwidth‐on‐demand (WFBoD) process for broadband multimedia geostationary satellite systems

Advanced resource management schemes are required for broadband multimedia satellite networks to provide efficient and fair resource allocation while delivering guaranteed quality of service (QoS) to a potentially very large number of users. Such resource management schemes must provide well‐defined service segregation to the different traffic flows of the satellite network, and they must be integrated with some connection admission control (CAC) process at least for the flows requiring QoS guarantees. Weighted fair bandwidth‐on‐demand (WFBoD) is a resource management process for broadband multimedia geostationary (GEO) satellite systems that provides fair and efficient resource allocation coupled with a well‐defined MAC‐level QoS framework (compatible with ATM and IP QoS frameworks) and a multi‐level service segregation to a large number of users with diverse characteristics. WFBoD is also integrated with the CAC process. In this paper, we analyse via extensive simulations the WFBoD process in a bent‐pipe satellite network. Our results show that WFBoD can be used to provide guaranteed QoS for both non‐real‐time and real‐time variable bit rate (VBR) flows. Our results also show how to choose the main parameters of the WFBoD process depending on the system parameters and on the traffic characteristics of the flows. Copyright © 2005 John Wiley & Sons, Ltd.     

半导体激光器芯片3dB带宽的测量

提出一种测量半导体激光器芯片频率响应的方法并建立了一套测试系统,通过校准完全剔除了夹具的影响.该方法简单、精确、实用性强.在理论上,该测试系统的测量范围只由测量仪器所决定.在实验中,测量了带宽为7 5GHz和10GHz的芯片,并与其他方法的测量结果进行了比较,表明该方法测量精度达到实用的要求,同时具有简单、易于操作的优点.     

宽带数字示波器高频特性检定问题的讨论

数字示波器带宽的提高,导致高频效应影响更加显著,使用条件更加苛刻,对检定设备及其系统连接提出了更高要求.如何减小或消除不良影响及充分挖掘检定设备潜力,实现准确和尽可能全面的检定,本文在依据常规数字示波器检定项目和方法的基础上,研究了各检定项目的可行性及采取的措施,特别是对其带宽和瞬态等高频特性的检定进行了重点讨论,从而实现宽带数字示波器的全面检定.     

一种管理磁盘存储空间的新方法

本文提出并探讨了一种管理磁盘存储空间的新方法－区间管理法（ＩＭＭ）。这种方法把磁盘存储空间视为若干连续块区间的集合，将物理上连续的空间分配给每个写请求，这为高速存取提供了支持。文中给出了ＩＭＭ的分配和回收算法流程，并作了可行性模拟。模拟结果表明，ＩＭＭ是一种有效的盘空间管理方法。     

Dynamic bandwidth recycle algorithm for OVSF–CDMA systems

This paper presents a dynamic bandwidth recycle algorithm in the downlink of a WCDMA system using orthogonal variable spreading factor codes (OVSF). It consists of a bandwidth recycle algorithm and a bandwidth reservation algorithm. The bandwidth recycle algorithm is used to recycle bandwidth from current serviced connections when the system does not have enough available bandwidth to support a bandwidth request. The bandwidth reservation algorithm is used to reduce transmission delay caused by suddenly increasing bandwidth requests. Four traffic classes, conversational, streaming, interactive, and background classes, defined by universal mobile telecommunication system (UMTS) are considered. Simulation results show that the bandwidth utilization and block rate are improved, the bandwidth guaranteed to conversational and streaming classes are protected, and the delay time of interactive and background classes are kept under an acceptable value even when the traffic load is heavy. Copyright © 2005 John Wiley & Sons, Ltd.     

嵌入式微处理器的高层总线缓冲模型

本文针对嵌入式微处理器结构特征,提出了一种高层总线缓冲模型.随后根据提出的缓冲模型设计仿真算法,并根据实际的设备行为进行抽样统计分析,实现了带有缓冲设备的高层动态仿真.结果显示高层的仿真结果反映了实测电路级仿真的数据趋势,具有很好的一致性,证明了高层模型及仿真的有效性.     

直通通信和拓扑结构研究

通过一开关系统扰一并行处理系统中的各节点的连接起来，在程序控制下，将欲通信的两节点间相应开关接通，实现两节点间信息的直接传输（直能通信）各种常见直能型拓扑结构对通信延迟、系统使用频带，加速比和效率的影响以及它们间的相互关系即为本文的研究内容。     

G公司生产流程的瓶颈分析与改进

采用瓶颈模型对G公司生产流程的瓶颈进行了分析,并提出改进措施,数据分析表明,所提出的改进方案对提高企业有效产出率有效.