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New Architectural Models for Visibly Controllable Computing: The Relevance of Dynamic Object Oriented Architectures and Plan Based Computing Models
Research and Teaching Output of the MIT Community
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Shrobe, H Laddaga, Robert
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Traditionally, we've focussed on the question of how to make a system easy to code the first time, or
perhaps on how to ease the system's continued evolution. But if we look at life cycle costs, then we
must conclude that the important question is how to make a system easy to operate. To do this we
need to make it easy for the operators to see what's going on and to then manipulate the system so
that it does what it is supposed to. This is a radically different criterion for success.
What makes a computer system visible and controllable? This is a difficult question, but it's clear that
today's modern operating systems with nearly 50 million source lines of code are neither. Strikingly,
the MIT Lisp Machine and its commercial successors provided almost the same functionality as today's
mainstream sytsems, but with only 1 Million lines of code. This paper is a retrospective examination of
the features of the Lisp Machine hardware and software system. Our key claim is that by building the
Object Abstraction into the lowest tiers of the system, great synergy and clarity were obtained. It is our hope that this is a lesson that can impact tomorrow's designs. We also speculate on how the
spirit of the Lisp Machine could be extended to include a comprehensive access control model and how
new layers of abstraction could further enrich this model.
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AI, Software Environments, Computer Archicture
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In practice, one model is not always enough and a complex system may be represented by a range of models, from simple to complex.
在实践中，一个模型常常是不够的，复杂的系统可以用从简单到复杂的多个模型表示。
After comparing a range of models with actual observations, his team predicts that the Arctic Ocean will be ice free during September as early as the end of this century.
通过比较各种模型与实际的观测情况，他们预言，最早到本世纪末北极海域在整个九月份都将处于无冰状态。
As a result, countries around the world struggled to seek legal protection for databases, having created a wide range of models of protection in which there are inherent flaws.
为此，世界各国纷纷对数据库进行法律保护，形成了多种不同的保护模式，但每种保护模式都存在固有的缺陷。
Proton has built factories capable of churning out 1m cars a year and has launched a range of models.
宝腾建立了年产量能达到100万台的工厂，还将发行一定数量的车型。
Our company offers a wide range of models for your selection and we welcome your to contact us for enquiries.
公司现备有大量的多种机型，我们一直期待着您的垂询！
The Premacy has stability control as an option on a "larger range of models."
在大多数车型上，稳定控制系统都是选装件。
In summary, there are a range of interrelated models used to analyze and define the data structures involved in service contracts, software implementations of those services, and the data platform.
总之，有很多相关的模型可用于分析和定义服务约定、服务的软件实现和数据平台中涉及的数据结构。
Application logic can invoke or deliver services using a range of programming models and techniques without considering whether the connection is direct or whether it traverses an ESB.
应用程序逻辑可以使用各种编程模型和技术调用或交付服务，而无需考虑是直接连接还是通过ESB传递的。
Inventory levels across the U.S. market dipped in July as a range of popular models began to run short on dealer lots.
7月美国汽车市场的库存下降,因一系列畅销车型开始缺货.
"We are now developing a full range of new models from the top-end to popularly-priced models, but we can't say anything more now, " he said.
“我们现在开发新模型的全方位从上面结束对普遍定价的模型，但我们无法现在说什么，”他说。
We are looking for a dynamic, ambitious, enthusiastic freelance Information Architect who has strong business acumen and the ability to understand and appreciate a wide range of business models.
我们正在寻找一个动态的，雄心勃勃，热情的自由职业者信息建筑师谁具有较强的商业触觉，并能够了解和欣赏了广泛的业务模式。
As data becomes more plentiful and computing more powerful, the range of possible models is rapidly expanding.
随着数据资料的日渐丰富，和计算技术的突飞猛进，我们可使用的模型也快速地日益增加。
Building up a range of paper models from WWI battleships to the fighter jets of tomorrow.
为你带来一系列纸制模型产品。由复古汽车到军用战机将一一展现眼前。
Building up a range of paper models from WWI battleships to the fighter jets of tomorrow.
纸上谈兵 - 为你带来一系列纸制模型产品。由复古汽车到军用战机将一一展现眼前。
Display models, we have about 5 major players in the UK. We currently offer the biggest range of ship models, and want to take on new suppliers.
在英国，有五大家静态船模代理公司，我们公司是英国最大的船模型供应商，现在，我们正在寻求新的供应商。
When we towards various dynamics model at present, how to compare and comprehend the specialty and the serviceable range of these models, it needs farther development in the future.
对于目前存在的各种动力学模型，如何的比较认识这些模型的优劣，以及各种模型的使用范围，这些还需要进一步的研究发展。
A range of less famous models in labs around the world grab headlines by gripping objects without destroying them, or walking a few steps without tipping onto their extremely expensive heads.
而全世界的实验室里那些不那么有名的机器人，则只能靠抓住物体而不会毁坏物体，或者保持异常昂贵的头部不倾斜的情况下行走几步这样的小把戏来占据新闻头条。
A range of less famous models in labs around the world grab headlines by gripping objects without destroying them, or walking a few steps without tipping onto their extremely expensive heads.
除此之外，世界各地的实验室里还有更多更不出名的机器人，它们有的能用手安全地抓起东西，有的能走上几步，而保持特别昂贵的头部不倾斜。 凭着这些技能，它们抢得了媒体的头条。
A range of less famous models in labs around the world grab headlines by gripping objects without destroying them, or walking a few steps without tipping onto their extremely expensive heads.
除此之外，世界各地的实验室里还有更多更不出名的机器人，它们有的能用手安全地抓起东西，有的能走上几步，而保持特别昂贵的头部不倾斜。 凭着这些技能，它们抢得了媒体的头条。
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, January 2011, Pages 1–11
ReviewA survey on security issues in service delivery models of cloud computing, ,
Anna University Tirunelveli, Tirunelveli, TN 627007, IndiaCloud computing is a way to increase the capacity or add capabilities dynamically without investing in new infrastructure, training new personnel, or licensing new software. It extends Information Technology&s (IT) existing capabilities. In the last few years, cloud computing has grown from being a promising business concept to one of the fast growing segments of the IT industry. But as more and more information on individuals and companies are placed in the cloud, concerns are beginning to grow about just how safe an environment it is. Despite of all the hype surrounding the cloud, enterprise customers are still reluctant to deploy their business in the cloud. Security is one of the major issues which reduces the growth of cloud computing and complications with data privacy and data protection continue to plague the market. The advent of an advanced model should not negotiate with the required functionalities and capabilities present in the current model. A new model targeting at improving features of an existing model must not risk or threaten other important features of the current model. The architecture of cloud poses such a threat to the security of the existing technologies when deployed in a cloud environment. Cloud service users need to be vigilant in understanding the risks of data breaches in this new environment. In this paper, a survey of the different security risks that pose a threat to the cloud is presented. This paper is a survey more specific to the different security issues that has emanated due to the nature of the service delivery models of a cloud computing system.KeywordsCloud computing; Data privacy; Data protection; Security; Virtualization
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