新的ATM地址解析协议NHRP

在进行了对ＡＴＭ的３种支持方案的简要比较之后，本文给出了ＩＰ ｏｖｅｒ ＡＴＭ方案的地址解析协议ＡＴＭ ＡＲＰ的要点和主要缺陷，随后介绍了ＩＰ ｏｖｅｒ ＡＴＭ在地址解析方面的新进展“下一站地址解析协议”ＮＨＲＰ。     

IP路由原理

ＩＰ（Ｉｎｔｅｒｎｅｔ Ｐｒｏｔｏｃｏｌ）协议是 ＴＣＰ／ ＩＰ协议族中两个最主要的协议之一。ＩＰ协议是以信息包为基础的协议,与ＩＰ协议配套使用的还有三个协议： 地址解析协议 ＡＲＰ（ＡｄｄｒｅｓｓＲｅｓｉｌｕｔｉｏｎ　Ｐｒｏｔｏｃｏｌ） 逆地址解析协议ＲＡＲＰ（Ｒｅｖｅｒｓｅ Ａｄｄｒｅｓｓ ＲｅｓｏｌｕｔｉｏｎＰｒｏｔｏｃｏｌ） “Ｉｎｔｅｒｎｒｔ控制报文协议ＩＣＭＰ（Ｉｎｔｅｒｎｅｔ Ｃｏｎｔｒｏｌ ＭｅｓｓａｇｅＰｒｏｔｏｃｏｌ） ＩＰ协议通过计算机网络交换数据,处理寻址、分割、拼接及协议信号分解。…     

IP Over ATM的新进展

简要比较了ＡＴＭ（异步传输模式）的３种支持方案，并介绍ＩＰＯｖｅｒＡＴＭ在两个方面，即ＩＥＴＦ的“集成服务Ｉｎｔｅｒｎｅｔ”概念（包括ＲＳＶＰＩＰＶ６等）和下一站地址解析协议的新进展。     

IPSOFACTO快速ATM信元传输上的IP交换

介绍卫和我需信令通过ＡＴＭ交换机建立路径,将ＩＰ流映射到ＡＴＭ交换的技术。ＩＰＳＯＦＡＣＴＯ（ＩＰ Ｓｗｉｔｃｈｉｎｇ Ｏｖｅｒ Ｆａｓｔ ＡＴＭ Ｃｅｌｌ Ｔｒａｎｓｐｏｒｔ）负责将ＩＰ流映射到一条ＡＴＭ交换路径。     

基于对象／Agent的计算机集成过程运行系统建模研究

运用面向对象方法学、ＫＡＤＳ原理以及分布式人工智能领域的Ａｇｅｎｔ概念,用对象描述过程领域,用Ａｇｅｎｔ描述过程运行决策系统,建立一种基于对象／Ａｇｅｎｔ的计算机集成过程运行（ＣＩＰＯ）系统模型。通过开发实例系统ＴＥ－ＣＩＰＯＳ,说明了该模型的应用及优点。     

AS／400,SCO UNIX和NETWARE平台上IP ROUTER的实现

本文叙述了ＡＳ／４００，ＳＣＯ ＵＮＩＸ和ＮＥＴＷＡＲＥ上ＩＰ ＲＯＵＴＥＲ实现的原理和配置方法。     

ATM网上高效运行多种协议模型研究

ＡＴＭ网上运行多种协议（ＭＰＯＡ）适用于下一代基于交换ＬＡＮ结构的技术。从本质上来说，ＭＰＯＡ扩展了局域网仿真与ＡＴＭ上的ＩＰ传输技术。本文讨论了ＭＰＯＡ叠加模型，分析了虚拟路由器的基本原理。详细讨论了ＭＰＯＡ叠加模型中逻辑功能的划分和逻辑功能间信息流。     

多Transputer处理器和并行处理技术在移动机器人中的应用

多Ｔｒａｎｓｐｕｔｅｒ处理器和并行处理技术在移动机器人中的应用吴陈，吴翰声（华东船舶工业学院计算机科学与工程系镇江２１２００３）ＡＮＡＰＰＬＩＣＡＴＩＯＮＯＦＭＵＬＴＩＰＬＥＴＲＡＮＳＰＵＴＥＲＰＲＯＣＥＳＳＯＲＳＡＮＤＰＡＲＡＬＬＥＬＰＲＯＣＥＳＳ...     

设置ADSL的网卡地址

ＡＤＳＬ在速度上比传统ＭＯＤＥＭ快很多,但由于有网卡的原因,以至在系统启动时比较慢。其实我们都知道只要指定了网卡的ＩＰ地址就可使系统启动速度正常,但问题是如果胡乱指定的话,可能令你无法使用ＡＤＳＬ　ＭＯＤＥＭ上网,所以在设置时应先找出可用的网卡ＩＰ地址。设置步骤如下：一、　找出可用网卡ＩＰ地址　使用虚拟拨号软件连接上Ｉｎｔｅｒｎｅｔ后,右击右下角的连接信号灯,点选Ａｄｖａｎｃｅｄ选项（图１）,然后再点选ＩＰ项（图２）,会看见网卡的一项,只要点击一下网卡项,就可得出网卡的可用ＩＰ地址及其子网掩码,…     

线性规划的分解原则及其实现

线性规划的分解原则及其实现魏紫銮（中国科学院计算中心）ＡＤＥＣＯＭＰＯＳＩＴＩＯＮＰＲＩＮＣＩＰＬＥＡＮＤＩＭＰＬＥＭＥＮＴＡＴＩＯＮＦＯＲＬＩＮＥＡＲＰＲＯＧＲＡＭＭＩＮＧ￥ＷｅｉＺｉ－ｌｕａｎ（ＣｏｍｐｕｔｉｎｇＣｅｎｔｅｒ，ＡｃａｄｅｍｉａＳｉ...     

Effect of spatial variation on areal evapotranspiration simulation in Haibei,Tibet plateau,China

Quantification of areal evapotranspiration from remote sensing data requires the determination of surface energy balance components with support of field observations. Much attention should be given to spatial resolution sensitivity to the physics of surface heterogeneity. Using the Priestley–Taylor model, we generated evapotranspiration maps at several spatial resolutions for a heterogeneous area at Haibei, and validated the evapotranspiration maps with the flux tower data. The results suggested that the mean values for all evapotranspiration maps were quite similar but their standard deviations decreased with the coarsening of spatial resolution. When the resolution transcended about 480 m, the standard deviations drastically decreased, indicating a loss of spatial structure information of the original resolution evapotranspiration map. The absolute values of relative errors of the points for evapotranspiration maps showed a fluctuant trend as spatial resolution of input parameter data layers coarsening, and the absolute value of relative errors reached minimum when pixel size of map matched up to measuring scale of eddy covariance system. Finally, based on the analyses of the semi‐variogram of the original resolution evapotranspiration map and the shapes of spatial autocorrelation indices of Moran and Geary for evapotranspiration maps at different resolutions, an appropriate resolution was suggested for the areal evapotranspiration simulation in this study area.     

地物大小、对象尺度、影像分辨率的关系分析

遥感数据的分辨率越来越高, 给地物信息提取提出了新的挑战。利用基于像元的分类技术和基于多尺度分割的面向对象分类技术对高分辨率影像进行分类实验, 分析地物大小、对象尺度与影像分辨率的关系。实验结果表明不同地物由于其空间尺度不同, 与之相适宜的空间分辨率和对象尺度也不同, 在适宜分辨率的影像提取有较高的精度, 在适宜的对象尺度上提取对象信息有更高的精度。分析也表明面向对象的多尺度影像分类技术适应了不同地物有其相适宜的空间分辨率, 在适宜尺度影像层中提取地物, 其分类精度大大高于基于像元的分类方法。     

基于空间角度-距离-速度的三维模糊函数

传统模糊函数是针对距离-速度两维目标分辨力提出的,从而给相邻目标距离-速度联合分辨提供一个评判标准,用以表征雷达发射波形的分辨能力。本文由模糊函数的定义出发,将二维模糊函数进行空间角度上的扩展,可用于阵列雷达系统在距离-速度-方位角三维上评估雷达发射波形的分辨力,即模糊函数能够定量表示“干扰目标”和观测目标可分辨能力,并且能够作为雷达波形选择优化、设计的依据。仿真实验和性能分析证明了本文所推导三维模糊函数的正确性和合理性。     

Investigation of perceived image quality and colourfulness in mobile displays for different cultures,ambient illumination,and resolution

This study explored the effects of culture, ambient illumination, and resolution on perceived image quality and colourfulness of mobile displays. Thirty Taiwanese and 30 American students participated in the experiment. Two types of culture (Taiwanese and American), two types of illumination level (1500 lux and 7000 lux), and five types of resolution level (320×240, 260×208, 200×160, 140×112, and 80×64) were investigated in the experiment. Interactions between culture and resolution, and between illumination and resolution, were found for both perceived image quality and colourfulness. The results indicated that subjects were able to detect smaller differences in perceived image quality but not for colourfulness, and Taiwanese subjects could detect smaller differences than could the American subjects for both perceived image quality and colourfulness. The results further indicated that Taiwanese subjects were able to detect smaller differences at most of the resolution levels for colourfulness in 1500 lux than were the American subjects.

Practitioner Summary: This study found, from culture differences and ergonomics considerations, that Taiwanese subjects could detect smaller differences than could American subjects when evaluating perceived image quality and colourfulness on mobile displays. Mobile display manufacturers can use the results of this study as a reference for future mobile display design.     

一种高速高分辨率CMOS比较器

本文讨论了一种高速CMOS比较器,采用前置放大器、锁存器和输出驱动级联的结构,通过优化传输速度、增益和失调电压,采用SMIC0.25umCMOS工艺,用CadenceSpectre模拟器仿真,结果表明最小分辨率为1mV,工作频率达到50MHz,功耗2mW。     

Gentzen-type systems,resolution and tableaux

We show that both the tableaux and the resolution methods can be understood as attempts to exploit the power of cut-elimination theorems in Gentzen-type calculi. Another, related goal is to provide a purely syntactic basis for both methods (in contrast to the semantic proofs concerning resolution that can be found in the textbooks). This allows the use of a fruitful combination of the methods and might be helpful in generalizing them to other logics.     

Robust High-Resolution Cloth Using Parallelism, History-Based Collisions, and Accurate Friction

In this paper we simulate high resolution cloth consisting of up to 2 million triangles which allows us to achieve highly detailed folds and wrinkles. Since the level of detail is also influenced by object collision and self collision, we propose a more accurate model for cloth-object friction. We also propose a robust history-based repulsion/collision framework where repulsions are treated accurately and efficiently on a per time step basis. Distributed memory parallelism is used for both time evolution and collisions and we specifically address Gauss-Seidel ordering of repulsion/collision response. This algorithm is demonstrated by several high resolution and high-fidelity simulations.     

A comparison of multi-spectral, multi-angular, and multi-temporal remote sensing datasets for fractional shrub canopy mapping in Arctic Alaska

Shrub cover appears to be increasing across many areas of the Arctic tundra biome, and increasing shrub cover in the Arctic has the potential to significantly impact global carbon budgets and the global climate system. For most of the Arctic, however, there is no existing baseline inventory of shrub canopy cover, as existing maps of Arctic vegetation provide little information about the density of shrub cover at a moderate spatial resolution across the region. Remotely-sensed fractional shrub canopy maps can provide this necessary baseline inventory of shrub cover. In this study, we compare the accuracy of fractional shrub canopy (> 0.5 m tall) maps derived from multi-spectral, multi-angular, and multi-temporal datasets from Landsat imagery at 30 m spatial resolution, Moderate Resolution Imaging SpectroRadiometer (MODIS) imagery at 250 m and 500 m spatial resolution, and MultiAngle Imaging Spectroradiometer (MISR) imagery at 275 m spatial resolution for a 1067 km² study area in Arctic Alaska. The study area is centered at 69 °N, ranges in elevation from 130 to 770 m, is composed primarily of rolling topography with gentle slopes less than 10°, and is free of glaciers and perennial snow cover. Shrubs > 0.5 m in height cover 2.9% of the study area and are primarily confined to patches associated with specific landscape features. Reference fractional shrub canopy is determined from in situ shrub canopy measurements and a high spatial resolution IKONOS image swath. Regression tree models are constructed to estimate fractional canopy cover at 250 m using different combinations of input data from Landsat, MODIS, and MISR. Results indicate that multi-spectral data provide substantially more accurate estimates of fractional shrub canopy cover than multi-angular or multi-temporal data. Higher spatial resolution datasets also provide more accurate estimates of fractional shrub canopy cover (aggregated to moderate spatial resolutions) than lower spatial resolution datasets, an expected result for a study area where most shrub cover is concentrated in narrow patches associated with rivers, drainages, and slopes. Including the middle infrared bands available from Landsat and MODIS in the regression tree models (in addition to the four standard visible and near-infrared spectral bands) typically results in a slight boost in accuracy. Including the multi-angular red band data available from MISR in the regression tree models, however, typically boosts accuracy more substantially, resulting in moderate resolution fractional shrub canopy estimates approaching the accuracy of estimates derived from the much higher spatial resolution Landsat sensor. Given the poor availability of snow and cloud-free Landsat scenes in many areas of the Arctic and the promising results demonstrated here by the MISR sensor, MISR may be the best choice for large area fractional shrub canopy mapping in the Alaskan Arctic for the period 2000-2009.     

Experimental verification of two-norm,infinity-norm continuous switching implemented in resolution of biarticular actuation redundancy

Utilization of redundancy endows systems with dexterity and fault tolerance in achieving its desired output, but its utilization implies added complication which must be resolved. Input optimization using the two-norm and the infinity-norm are two methods popularly utilized to address this problem. However, each resolution criteria finds its greatest benefit in opposite circumstances. This fact has long motivated a resolution system which makes use of both norms, switching back and forth when called for. In a previous publication, we introduced and proved the continuity of the first realization of such a switching resolution system, implemented in the resolution of biarticular actuation redundancy. In this work, we demonstrate the empirical validity and utility of the switching system through implementation in a developed robotic arm equipped with biarticular actuation redundancy. It is found that resolution allows for equivalent maximum torque requirements as the infinity-norm – an improvement over two-norm – but with improved electrical energy requirements over infinity-norm.     

集成数据库及KDD的复杂体系定性定量及结构解析智能系统

本文对如何构建一个全新的解析智能系统进行了描述。该系统的特点是把基于化学计量学的解析算法和专家系统柔性集成到一起,并把数据库知识发现（ＫＤＤ）技术和专家数据库（ＥＤ）技术作为构建专家系统知识库的核心工具。利用解析算法可使复杂化学体系简化,结合改进的专家系统可实现化学体系定性定量及结构解析的智能化。