Dimensions of variability in embedded operating systems

Design, implementation, and re-engineering of operating systems are still an ambitious undertaking. Despite, or even because, of the long history of theory and practice in this field, adapting existing systems to environments of different conditions and requirements as originally specified or assumed, in terms of functional and/or non-functional respects, is anything but simple. Especially this is true for the embedded systems domain which, on the one hand, calls for highly specialized and application-aware system abstractions and, on the other hand, cares a great deal for easily reusable implementations of these abstractions. The latter aspect becomes more and more important as embedded systems technology is faced with an innovation cycle decreasing in length. Software for embedded systems needs to be designed for variability, and this is in particular true for the operating systems of this domain. The paper discusses dimensions of variability that need to be considered in the development of embedded operating systems and presents approaches that aid construction and maintenance of evolutionary operating systems. CR subject classification  C.3; D.2.11; D.2.13; D.4.7     

The Adoption of the Compact Disk Player: An Event History Analysis for the Netherlands

The compact disk (CD) player was one of the major audio innovations of the 1980s in the Netherlands. For studies of the temporal and social diffusion pattern of the CD player and the compact disks, both cultural and economic theories about innovations and music consumption are available. In this paper, these theories are combined in six working hypotheses concerning earlier adoption. The empirical analysis includes both time-invariant and time-varying variables and consumer characteristics. Event history analysis, the technique used in this article, enables one to incorporate these kinds of variables simultaneously in a dynamic model. Compared with the diffusion models usually employed by means of longitudinal analysis, event history analysis is a significant improvement in studying the development of the CD market in the Netherlands.     

对中外优秀男篮运动员防守持球队员助攻能力的比较分析

通过对中、外优秀男篮运动员的比赛录像进行分析,针对防守助攻这个指标进行数据对比。发现我国男篮运动员在防守助攻能力方面与国外优秀男篮运动员存在差距。建议要重视防守技术的发展,真正做到以守促攻的目的。     

档案事业与社会主义精神文明建设

档案工作是积累、储存档案这一历史文化财富,开发、利用档案信息资源的工作.它形成于物质文明和精神文明的建设,又反馈于这两个文明,为两个文明服务.因此,如何研究档案事业与社会主义精神文明建设的重要关系,充分发挥档案工作的独特优势,促使档案事业在社会主义精神文明建设的框架内,得以丰富和发展,应当成为每一位档案工作者必须思考的一个重大现实问题.     

基于协同机制的Tag资源自动分类研究

融合通俗分类法和传统分类法的优点，提出基于协同机制的Tag资源自动分类方案，并对其核心问题进行分析和算法实现。     

Efficient reverse k-nearest neighbor estimation

The reverse k-nearest neighbor (RkNN) problem, i.e. finding all objects in a data set the k-nearest neighbors of which include a specified query object, has received increasing attention recently. Many industrial and scientific applications call for solutions of the RkNN problem in arbitrary metric spaces where the data objects are not Euclidean and only a metric distance function is given for specifying object similarity. Usually, these applications need a solution for the generalized problem where the value of k is not known in advance and may change from query to query. In addition, many applications require a fast approximate answer of RkNN-queries. For these scenarios, it is important to generate a fast answer with high recall. In this paper, we propose the first approach for efficient approximative RkNN search in arbitrary metric spaces where the value of k is specified at query time. Our approach uses the advantages of existing metric index structures but proposes to use an approximation of the nearest-neighbor-distances in order to prune the search space. We show that our method scales significantly better than existing non-approximative approaches while producing an approximation of the true query result with a high recall.     

21世纪高校体育教育观念之探析

以拓新高校体育观念为目的，采用文献资料，社会调研，比较分析和理论探索等方法，在对我国高校体育教育思想作出客观评价的基础上，深入的研究了发达国家高等体育教育的成功经验，探索了消除传统体育思想、观念与克服体制障碍的科学途径。     

计算机软件的知识产权保护及其社会成本

随着计算机产业的不断发展 ,软件盗版问题变得更加突出 ,如何对计算机软件进行知识产权保护的问题已引起全社会的广泛关注。同时 ,软件的知识产权保护也会带来一定的社会成本。本文主要介绍计算机软件保护的综合法律体系 ,并分析了知识产权保护的成本收益与社会成本 ,提出了一些构想和建议     

泰国高等教育现代化研究

在近现代历史上,泰国是少数几个没有完全遭受西方殖民统治的亚洲国家之一。本文对泰国高等教育现代化所采取的策略、主要特征及其经验教训进行了分析和论述。