如何看待及展望中国PLC市场

近几年 ,ＰＬＣ在中国的应用非常快 ,且应用领域越来越广 ,作为世界领先的ＰＬＣ厂商 ,您认为ＰＬＣ产品今后的发展趋势是什么 ?ＰＬＣ产品在世界的应用非常快 ,领域也越来越广 ,作为业界领先的ＰＬＣ生产厂商欧姆龙公司 ,我们认为今后有两个发展趋势 :一个是往大的方向发展 ;一个是往小的方向发展。往大发展简而言之就是网络化。可以说今后的ＰＬＣ网络化就是与计算机技术逐步融合在一起。举个例子 :比如在一些大型工程项目中 ,在化工、钢铁和冶金等行业 ,以前ＰＬＣ介入相对比较少。为什么介入比较少呢 ?因为随着这些行业技术应用的不断发…     

How coinvention shapes our market

Users actually do much of the inventing in the computer market. They invent for a simple reason. Rarely is a new technology useful immediately after purchase. It needs customizing, reshaping, and improving. Users change things after trying them out for a while. Users do a lot of “coinventing,” as colleague Tim Bresnahan and I have termed it. Coinvention makes technology useful. It is impossible to understand the computing market without appreciating why and how users coinvent. The costs of coinventive activity can be substantial and can easily swamp the initial outlay for the technology. More to the point, Bresnahan and I believe that coinvention is the key to understanding the diffusion of client-server systems. In particular, we examined this diffusion to large-scale users. Why did some buyers act boldly and others cautiously? Why did some experiment early and others late? Our answer is all wrapped up with coinvention. We studied establishments from 1988 to 1994. A summary of the results of this survey is presented     

重塑自我

和所有创意领域一样，设计也是潮流性的东西，因此一流设计师、插画师和代理公司又如何在这一领域保持领先优势呢？Seam Ashcroft将和几位专家共同探讨保持新颖风格的最佳途径。插画由STUDIO POANA提供[编者按]     

浅谈Internet的建立

本文通过实例,简单地论述如何用Ｍｉｃｒｏｓｏｆｔ的网络产品ＮＴ Ｓｅｒｖｅｒ４．０和Ｂａｃｋｏｆｆｉｃｅ建立Ｉｎｔｒａｎｅｔ网。用ＮＴ Ｓｅｒｖｅｒ４．０实现ＴＣＰ／ＩＰ ＬＡＮ,ＷＷＷ及数据库服务。     

浅谈Intranet的建立

本文通过实例,简单地论述如何用Ｍｉｃｒｏｓｏｆｔ的网络产品ＮＴＳｅｒｖｅｒ４．０和Ｂａｃｋｏｆｉｃｅ建立Ｉｎｔｒａｎｅｔ网。用ＮＴＳｅｒｖｅｒ４．０实现ＴＣＰ／ＩＰＬＡＮ,ＷＷＷ及数据库服务。     

如何建立高效的物流体系

中国有句古谚云:人尽其才,物尽其流.这很好地道出了快捷高效的物资流动对国计民生的重要性.目前,电子商务在中国蹒跚而行,很大程度上也起因于中国现阶段发展相对滞后的物流体系.物流,在昨天、今天和明天都将是企业经营中一个不可或缺的重要环节.     

Keep your bots to yourself [software law]

There are now a variety of Web bots or spiders available to scour the Web to automatically gather information. Bots, sometimes called agents when they are instructed to perform particular searches, are useful in performing the time-consuming and repetitive searches required to gather comparison data or to find an elusive item. In some cases, agents can not only find information but can make a purchase or take another action based on the data they collect. Although bots are great for consumers, some Internet retailers hate them. Just as a brick and mortar store wants potential customers to walk in the door, Web retailers want potential customers to personally view their sites. Once there, consumers might purchase the initial products they were seeking and then see advertisements or buy accessories, upgrades, or unrelated additional items as well. Because bots can reduce or eliminate these possibilities, some Internet retailers are trying to stop them. It's one thing to be upset about bots, spiders, agents, and data miners, but it is quite another to put an end to the practice. It should come as no surprise that federal and state laws in the US do not expressly mention bots. Those seeking to challenge their use must resort to a variety of more generic laws, none of which fit very well     

How to win an evolutionary arms race

To keep up with malware writers, software producers in both the commercial and open-source software worlds have adopted various automatic software update mechanisms. Some of these mechanisms distribute updates after requesting a user's permission; others install updates automatically. Although such systems provide some short-term relief, they will likely soon become ineffective, and further, they will also become extremely dangerous once they are inevitably co-opted by attackers. If we want the Internet to remain a viable way to communicate and collaborate, we must adopt another, perhaps radically different, model for securing our computers. To better understand this conclusion, we should first re-examine why developers and users are embracing automated update systems.     

The hasty wisdom of the mob: How market sentiment predicts stock market behavior

We explore the ability of sentiment metrics, extracted from micro-blogging sites, to predict stock markets. We also address sentiments’ predictive time-horizons. The data concern bloggers’ feelings about five major stocks. Taking independent bullish and bearish sentiment metrics, granular to two minute intervals, we model their ability to forecast stock price direction, volatility, and traded volume. We find evidence of a causal link from sentiments to stock price returns, volatility and volume. The predictive time-horizon is minutes, rather than hours or days. We argue that diverse and high volume sentiment is more predictive of price volatility and traded volume than near-consensus is predictive of price direction. Causality is ephemeral. In this sense, the crowd is more a hasty mob than a source of wisdom.     

学生如何正确掌握OFFICE软件

Microsoft Office是一套由微软开发的办公软件。电脑普及之后,已成为人们生活中的“常用软件”。数字化办公,小到会议记录,大到社会统计离不开它的帮助。当今社会,办公自动化成为大趋势,对于学生而言,现在能够扎实的掌握Office软件的使用方法,对于今后的就业与工作都有着深远的意义。     

基于AutoCAD中工程图的生成

随着计算机的发展,三维图形得到推广与应用,而在生产中,还是需要一些二维图形,这就要求我们将三维图形转换成二维图形,在AutoCAD中生成工程图（二维图形）就必须解决几个问题：视图的生成、剖面线的设置、线型、尺寸标注等。     

浅谈ASP环境下建构线上考试程序

本文就自编的并为本校所应的《线上考试》程序，从实时性，实用性和关联性等角度详细阐述的逻辑建橡和设计技巧。     

用Visio制作电子宣传栏

Microsoft Visio是Office家族的成员,一款简洁、灵活、形象、直观的多功能图表制作程序。本文以制作宣传栏为例,介绍了一些易于掌握的Visio使用技巧。     

A study on effects of market systems in an artificial market

In an artificial market approach with multi-agent systems, the static equilibrium concept is often used in market systems to approximate continuous market auctions. However, differences between the static equilibrium concept and continuous auctions have not been discussed in the context of an artificial market study. In this paper, we construct an artificial market model with both of them, namely, the Itayose and Zaraba method, and show simple characteristic differences between these methods based on computer simulations. The result indicates the further need to model the market system by studying artificial markets. Hidenori Kawamura, Ph.D.: He received Ph.D. degree from Division of Systems and Information Engineering, Graduate School of Engineering, Hokkaido University, Japan in 2000. He is currently an instructor in Graduate School of Information Science and Technology, Hokkaido University, Japan. His research interests include multiagent systems, mass user support, artificial intelligence, complex systems, and tourism informatics. He is a member of IPSJ, JSAI, IEICE, ORSJ, JSTI and AAAI. Yasushi Okada, Ph.D.: He is a master course student in Graduate School of Engineering, Hokkaido University, Japan. He studies multiagent systems. Azuma Ohuchi, Ph.D.: He received his Ph.D. degree in 1974 from Hokkaido University. He is currently the professor in Graduate School of Information Science and Technology, Hokkaido University Japan. His research interstes include systems information engineering, artificial intelligence, complex systems, tourism informatics and medical systems. He is a member of the IPSJ, JSAI, IEEJ, ORSJ, Soc. Contr. Eng., Jap. OR Soc., Soc. Med. Informatics, Hosp. Manag., JSTI and IEEE-SMC. Koichi Kurumatani, Ph.D.: He received his Ph.D. Degree in 1989 from The University of Tokyo. He is currently a leader of Multiagent Research Team in Cyber Assist Research Center (CARC), National Institute of Advanced Industrial Science and Technology (AIST), Japan. His research interests include multiagent systems and mass user support. He is a member of JSAI, IPSJ, JSTI and AAAI.     

用Visio制作电子宣传栏

Microsoft Visio是Office家族的成员,一款简洁、灵活、形象、直观的多功能图表制作程序.本文以制作宣传栏为例,介绍了一些易于掌握的Visio使用技巧.     

基于AutoCAD中工程图的生成

随着计算机的发展,三维图形得到推广与应用,而在生产中,还是需要一些二维图形,这就要求我们将三维图形转换成二维图形,在AutoCAD中生成工程图(二维图形)就必须解决几个问题:视图的生成、剖面线的设置、线型、尺寸标注等.