CCM系统的设计与实现

ＣＣＭ模型是一个基于Ｐｅｔｒｉ网的用于软件并行开发控制的模型。本文对实现该模型的ＣＣＭ系统进行了讨论。ＣＣＭ系统对用ＣＣＭ语言描述的ＣＣＭ模型进行识别,利用可达树作为分析工具对所识别的ＣＣＭ模型的活性进行分析将其转换为屏幕可视的图形形式。     

三维CAD/CAM软件评测专栏

三维ＣＡＤ／ＣＡＭ软件评测专栏ＣｉｍａｔｒｏｎＣＡＤ／ＣＡＭＶ９．０系统是以色列ＣｉｍａｔｒｏｎＣｏ。的ＣＡＤ／ＣＡＭ／ＰＤＭ产品,是较早在微机平台上实现３ＤＣＡＤ／ＣＡＭ全功能的系统。本次提供评测的ＣｉｍａｔｒｏｎＣＡＤ／ＣＡＭ／ＰＤＭＶ９．０ｆｏ...     

一个扩展的CCS

诉微分算子ＣＣＳ（Ｃａｌｃｌｕｓ ｏｆ Ｃｏｍｍｕｎｉ－ｃａｔｉｎｇ Ｓｙｓｔｅｍｓ）是由英国爱丁堡大学计算机科学系的ＲｏｂｉｎＭｉｌｎｅｒ首先提出的。ＣＣＳ是一个在数学上完整的理论算子系统,可以作为计算机通讯系统的基本理论模型。我们先简要说明一个ＣＣＳ的内容。我们所作的工作是在理论上扩充地的ＣＣＳ,使得我们的ＣＣＳ更为一般化。在我们的观战看来,ＲｏｂｉｎＭｉｂｅｒ的ＣＣＳ只不过是我们的ＣＣＳ的一     

SIMATIC WinCC环境中C语言的应用

论述了ＳＩＭＡＴＩＣ ＷｉｎＣＣ中Ｃ语言在控制系统操作界面设计中的基本特性和应用方法。并针对ＷｉｎＣＣ中Ｗｉｎｄｏｗｓ编程难于掌握的特点,列举了采用ＷｉｎＣＣ内标准Ｃ语言编程的实例,以实现ＷｉｎＣＣ的功能扩展。该技术改造具有很大的通用性和灵活性,可在其功能函数的扩展中作为参考,具备推广价值。     

8098单片机在智能化仪器仪表中的应用（四）：自动增益变换控制及被测信号的监

以不同剂量的ＣＣＣ对马尾松苗木进行土壤施药处理以及用不同浓度的ＣＣＣ、Ｂ－９和ＰＰ３３３对苗木进行叶面喷施试验．１０００、１５００ｐｐｍＣＣＣ土壤施药以及７５０、１０００ｐｐｍＣＣＣ，１５００ｐｐｍ Ｂ－９和５００、７５０ｐｐｍ ｐｐ３３３叶喷处理对苗木地上部分生长有明显抑作用，并明显促进根部生长，并明显促进要部生长，提高根冠比。     

在CSCW系统中应用IRC

探讨在ＣＷＣＷ工作系统中采用ＩＲＣ的可能性及模式。首抚,简要地介绍了ＣＳＣＷ和ＩＲＣ基本概念,然后对协同工作中人际交流模式进行了分类研究。最后,在ＣＳＣＷ系统中实现ＩＲＣ机制进行了研究并介绍了一个简单的ＩＲＣ模型实现。     

用查表法实现CRC计算

本文以工程应用为目的，分析了串行通信技术中利用最有效的错误检测手段──增加ＣＲＣ冗余位对数据错误进行检测时应采取的一种方便、有效的方法──查表法，构造了利用最通用的ＣＲＣ多项式（ＣＣＩＴＴ多项式和ＣＲＣ－１６多项式）进行ＣＲＣ快速计算的一系列函数。在实际应用中，这些函数可直接调用。     

注塑模CAD／CAE／CAM技术及其发展概况

分析了注塑模ＣＡＤ／ＣＡＥ／ＣＡＭ技术的基本内容，综述了国内外注塑模ＣＡＤ／ＣＡＥ／ＣＡＭ技术的主要特点和研究概况，并指出了存在的问题。提出采用特征造型技术、融合人工智能技术、勾通注塑模ＣＡＤ／ＣＡＥ／ＣＡＭ技术，并指出了进一步发展的方向。     

以OOEDB为核心的集成化CAD/CAPP/CAM 系统GS-ICCC的设计与实现

ＧＳ－ＩＣＣＣ是一个以自行研制开发的面向对象工程数据库管理系统ＯＳＣＡＲ为核心的集成化ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统，它的主要特点是按照ＳＴＥＰ标准在全局产品数据模型基础上实现ＣＡＤ，ＣＡＰＰ，ＣＡＭ的信息集成，本文围绕着这一原则介绍了ＧＳ－ＩＣＣＣ的系统总体结构，ＯＳＣＡＲ功能组织，全局产品数据建模框架以系统集成的设计与实现。     

上海大众汽车覆盖件模具CAD／CAE／CAM系统

ＣＡＤ／ＣＡＥ／ＣＡＭ技术在现代汽车模具设计和制造中具有重要作用，本文立足于上海大众汽车有限公司对车身覆盖件模具ＣＡＤ／ＣＡＥ／ＣＡＭ系统的需求，论述了上海大众汽车覆盖件模具ＣＡＤ／ＣＡＥ／ＣＡＭ系统的软硬件平和系统的结构体系，本文介绍的ＣＡＤ／ＣＡＥ／ＣＡＭ系统已在上海大众的覆盖件模具设计制造和冲压工艺规划中的开始应用，并取得若干成果。     

Production control: Current developments and future trends

Manufacturing industry is going through a period of unprecedented change as a result of the developments in micro-electronic technology. This is bringing about a transformation not only in hardware, in the form of computer-aided manufacturing, but in the manner in which production is organised and controlled.It is in the latter connection that the present paper sets out to review current developments and future trends. In particular the machine readable bar-code is seen as a key element in extending computerised control to cover not only the machines, but tools, materials and parts and their movement in the development of fully integrated manufacturing systems.As the move towards automation gathers pace it is forecast that manufacturing industry will become more process industry like in form, with consequences for the way in which production is organised and controlled.Finally consideration is given to the manner in which these current developments in the field of production are giving rise to a structural alteration in industrial labour requirements in which, in the future, fewer people will be required but on highly enriched work tasks.     

Ecosystem functioning of protected and altered Mediterranean environments: A remote sensing classification in Doñana, Spain

Spatial heterogeneity in ecosystem functioning is a key component of ecological variability requiring special attention in the context of global change. A large history of human use has produced high physiognomic heterogeneity in Mediterranean ecosystems. However, the consequences for ecosystem functioning remain insufficiently understood. We analyzed spectral indicators of matter and energy fluxes in the land surface to classify the functional ecosystem heterogeneity in a Mediterranean region covering different management histories and protection types. We specifically analyzed the spatial variability in seasonal and annual patterns in the Normalized Difference Vegetation Index (NDVI), surface temperature (T_s) and albedo from five Landsat ETM images. Then we classified numerically this variability into ecosystem functional types (EFTs) and explored their seasonal dynamics in terms of photosynthetic radiation absorption and evapotranspiration. We identified eight main EFTs with ecologically relevant differences including contrasting dynamics in fPAR seasonality, great variation in incoming radiation reflection and differing evapotranspiration rates, particularly during the water-limitation period. Functional variability in natural vegetation mostly consisted in dissimilar annual rates of NDVI and albedo, whereas differences in seasonality were more evident in transformed areas. Similarly, the spatial distribution of EFTs was partly associated to protection, with two EFTs exclusive of protected areas and comparatively higher functional diversity in humanized areas. Landform effects on water availability in protected areas and human activities under different ecological settings were seemingly responsible for the large functional diversity of the region. We advocate for the explicit incorporation of multifunctional ecosystem heterogeneity in ecosystem management and monitoring designs.     

Combined effects of fabric air permeability and moisture absorption on clothing microclimate and subjective sensation during intermittent exercise at 27 degrees C

The present paper aimed at determining the combined effects of two different levels of air permeability and moisture absorption, in terms of clothing microclimate and subjective sensation, in resting and exercising subjects at an ambient temperature of 27 °C, a relative humidity of 50% and an air velocity of 0.14 m s^-1. Three kinds of clothing ensemble were investigated: (1) polyester clothing with low moisture absorption and low air permeability (A), (2) polyester clothing with low moisture absorption and high air permeability (B), and (3) cotton clothing with high moisture absorption and high air permeability (C). The subjects exercised for 10 min on a cycle ergometer at an intensity of 30% maximal oxygen uptake and then had a 10 min rest. This sequence was repeated four times. The main findings are summarized as follows: (1) The clothing microclimate humidity in the back area was significantly higher in A than in B, and in C than in B. (2) The clothing microclimate temperature in the chest area was significantly higher in B than in A, and in B than in C. (3) The clothing microclimate temperature in the back area was significantly higher in C than in B. (4) The clothing surface temperature was significantly higher in C than in B. (5) Although the positive relationships between the microclimate humidity and forearm sweat rate was significantly confirmed in all three kinds of clothing, the microclimate humidity at chest for the same sweat rate was lower in C than in A and B. (6) Although the positive relationships between subjective sensation and forearm sweat rates were significantly confirmed in all three kinds of clothing, the subjective discomfort seemed to be reduced more effectively in C than in A and B for the same sweat rate. These results were discussed in terms of thermal physiology and combined effects of air permeability and moisture absorbency of the fabrics.     

Interannual covariability between actual evapotranspiration and PAL and GIMMS NDVIs of northern Asia

This study examined the covariability between interannual changes in the normalized difference vegetation index (NDVI) and actual evapotranspiration (ET). To reduce possible uncertainty in the NDVI time series, two NDVI datasets derived from Pathfinder AVHRR Land (PAL) data and the Global Inventory Monitoring and Modeling Studies (GIMMS) group were used. Analyses were conducted using data over northern Asia from 1982 to 2000. Interannual changes over 19 years in the PAL-NDVI and GIMMS-NDVI were compared with interannual changes in ET estimated from model-assimilated atmospheric data and gridded precipitation data. For both NDVI datasets, the annual maximum correlation with ET occurred in June, which is the beginning of the vegetation growing season. The PAL and GIMMS datasets showed a significant, positive correlation between interannual changes in the NDVI and ET over most of the vegetated land area in June. These results suggest that interannual changes in vegetation activity predominantly control interannual changes in ET in June. Based on analyses of interannual changes in temperature, precipitation, and the NDVI in June, the study area can be roughly divided into two regions, the warmth-dominated northernmost region and the wetness-dominated southern region, indicating that interannual changes in vegetation and the resultant interannual changes in ET are controlled by warmth and wetness in these two regions, respectively.     

关联规则挖掘技术研究进展*

为帮助人们深入研究关联规则挖掘技术,总结了关联规则的分类方法、评价方法以及相关技术的最新进展,特别是对关联规则的主要算法进行了详细的介绍,并探讨未来的发展方向。该研究比较系统全面,对将来进一步深入分析关联规则挖掘技术具有指导意义。     

DiffServ体系带宽代理消息机制的安全性研究

探讨了使用DiffServ QoS架构的IP网络内资源管理的带宽代理BB(Bandwidth Broker)机制以及BB使用的消息机制的安全性问题，提出了两种可用于实现消息机制安全性的方案，并给出了具体实现方法的建议。     

Organisational computer supported collaborative learning: the affect of context

The purpose of this introduction is to provide a brief overview of the articles in this special issue and also a framework for understanding, designing and evaluating strategies for co-operative learning in the workplace and in educational environments. The special edition is divided into two parts—Issue 1: Computer Supported Collaborative Learning in Formal Education, and Issue 2: Computer Supported Team and Organisational Learning in Workplaces. In general, Issue 1 focuses on collaborative learning in primary and secondary schools and in the University setting. Issue 2 is meant to focus on learning in complex and often highly stressful work situations which mostly require intensive communication in groups or teams and in each case allow for learning in the wider organisation. This introduction outlines a set of themes that can be found in the following papers and traces briefly how each paper fits within each discussion.     

冲压自动生产线上下料机器人示教编程方法

针对由多台机器人及多种辅助设备组成的冲压自动生产线编程量大、运动协调关系复杂、联锁信号多的特点 ,介绍一种离线规划与在线示教相结合的冲压机器人示教编程方法 ,对冲压机器人进行运动轨迹、作业内容等方面的示教 ,降低了示教内容的复杂性 ,节省了在线示教所占用的现场调试和生产时间。     

生物传感器检测牛奶病原微生物的研究进展

牛奶中病原微生物的含量是衡量牛奶质量的重要指标之一,生物传感器在牛奶病原微生物检测方面有较好的优势.介绍了生物传感器的组成和原理,并详细综述了近几年电化学生物传感器和质量敏感型生物传感器在牛奶中病原微生物的定量检测中的研究现状,探讨了未来的发展趋势.     

HOW OP-20-G GOT RID OF JOE ROCHEFORT

ABSTRACT

In late October 1942, LtCmdr Joseph Rocherfort, USN, was dismissed from his job as officer in charge of the Navy's radio intelligence center in Honolulu. Trained in both Japanese language and radio intelligence, he had been sent there a little over a year before by OP-20-G, the element in naval communications in overall charge of radio intelligence. During that time he had seen his beloved Pacific Fleet in both defeat and victory. His contributions in radio intelligence in that short time were legendary among his colleagues in Hawaii and his services were so highly valued by the Commander in Chief of the Pacific Fleet, Admiral Chester Nimitz, that, after the American victory at Midway, he was recommended for a Distinguished Service Medal. This article describes how and why, so early in the war, this multi-talented naval officer lost his job in Hawaii and spent virtually the entire war outside the intelligence field altogether.