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本文在开源(Open Source)项目Jakarta Lucene的基础上,结合多种开源文档格式分析工具,设计和实现了一种可扩展的全文检索框架,该框架可高效地对XML、HTML、MS Word、PDF等格式的文档进行全文检索.整个框架完全基于开源工具包,可以有效地对信息系统的开发进行支持. 相似文献
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1999年,IBM与Novell签订合作协议,成功地提供电子商务的解决方案给予原先使用NetWare的用户。同年更是推出了WebSphere Application Server3.0,并且推出WebSphere Studio与VisualAge for Java让工程师可以快速开发相关的程序。2001年,IBM更是宣布将应用服务器、开发工具整合在一起,与DB2、Tivoli及Lotus结合成为一套共通解决方案,如今、IBM更是并入了Rational Rose(UML tools)让开发流程更是完整化。 相似文献
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"道德底线不似法律底线,没有明文规定,也没有强制性,是相对软性的东西,每个人心中都会有一些自认为神圣庄严的情感或信仰。那么我们只能够将其设定为‘不引起多数人的审美反感’、‘不伤害多数人的情感’、‘不损害多数人的利益’。""互联网拆除的不仅仅是进行表达时所可能遇到的障碍,它还拆除声音达致自己的受众的障碍。" 相似文献
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计算机网络信息安全面临的问题和对策 总被引:1,自引:0,他引:1
计算机的广泛应用把人类带入了一个全新的时代,特别是计算机网络的社会化,已经成为了信息时代的主要推动力.目前,全世界的军事、经济、社会、文化各个方面都越来越依赖于计算机网络,人类社会对计算机的依赖程度达到了空前的纪录.由于计算机网络的脆弱性,这种高度的依赖性使国家的经济和国防安全变得十分脆弱,一旦计算机网络受到攻击而不能正常工作,甚至瘫痪,整个社会就会陷入危机. 相似文献
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<正>2007年11月1日,美国国家仪器公司(NI)在北京喜来登长城饭店成功举办了测量、控制和设计领域的年度盛会—NIDays 2007,这已经是NI公司连续第9年在中国地区举办这样的行业技术会议了。来自全国范围内各行各业的600多位用户、12家合作伙伴以及十多家媒体 相似文献
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丁海骜 《CAD/CAM与制造业信息化》2006,(5):20-24
美国阿姆斯壮国际公司(Armstrong Intemational,Inc.)成立于1900年,是一家具有百年历史的国际公司,北京康森阿姆斯壮机械有限公司系中美合资生产型企业,由美国阿姆斯壮国际公司(Armstrong Intemational Inc)和北京拓峰科技开发有限责任公司共同投资建立,目前的北京康森阿姆斯壮继承了母公司的业务,主要从事蒸汽系统节能产品的生产制造,用户遍布全国,覆盖了包括石油、石化、冶金、化工、制药、机械、电子、电力、橡胶、造纸、食品等诸多行业. 相似文献
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5月12日,一场突如其来的大地震袭击了四川省及其周边一些地区,这场大地震,夺去了数万人的生命,也牵动了国家和亿万人民群众的心。灾害发生后,全体中国人民众志成城,在罕见的特大地震面前表现出钢铁般的意志和战胜灾害的决心。党和国家领导人对抗震救灾工作迅速作出重要指示,温家宝总理灾后四个小时,不顾随时可能发生的余震,亲临救 相似文献
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孙德鸿 《CAD/CAM与制造业信息化》2007,(10):39-42
一、传统保存方案的缺陷 传统的工程图样和资料的保存归档形式是通过纸质或胶片的形式进行的,很多企业都用专门的仓库保管这些珍贵的技术资料.这些资料的内容相当广泛,包括机械设计、建筑设计、工程设计、测绘及地图等各行业的信息.资料的介质也有不同的分类,包括硫酸纸、纸质蓝图、白图及胶片等. 相似文献
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An ultra-massive distributed virtual environment generally consists of ultra-massive terrain data and a large quantity of
objects and their attribute data, such as 2D/3D geometric models, audio/video, images, vectors, characteristics, etc. In this
paper, we propose a novel method for constructing distributed scene graphs with high extensibility. Thismethod can support
high concurrent interaction of clients and implement various tasks such as editing, querying, accessing and motion controlling.
Some application experiments are performed to demonstrate its efficiency and soundness.
Supported by the National Basic Research Program of China (Grant No. 2004CB719403), the National High-Tech Research & Development
Program of China (Grant Nos. 2006AA01Z334, 2007AA01Z318, 2009AA01Z324), the National Natural Science Foundation of China (Grant
Nos. 60573151, 60703062, 60833007), and the Marine 908-03-01-10 Project 相似文献
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This paper presents the definition of multi-dimensional scalability of the Internet architecture, and puts forward a mathematical method to evaluate Internet scalability based on a variety of constraints. Then, the method is employed to study the Internet scalability problem in performance, scale and service scalability. Based on the examples, theoretical analysis and experimental simulation are conducted to address the scalability issue. The results show that the proposed definition and evaluation method of multi-dimensional Internet scalability can effectively evaluate the scalability of the Internet in every aspect, thus providing rational suggestions and methods for evaluation of the next generation Internet architecture. 相似文献
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Bump mapping is a texture-based rendering approach for simulating surface details to make its illumination results have three-dimensional
effects. The bumpy properties of an object are determined by height maps. But in the process of generating height maps, a
problem arises, i.e. to get a correct value of the pixel height, empirical data should be calculated repeatedly, which proves
very complicated, and meanwhile the realistic rendering effect is reduced, because the bumpy property is exaggerated in the
height map. Therefore, in this paper, we present a method for describing the details of the bumpy texture, where a new concept
“bumpy map” is introduced to replace the height map. Experimental results demonstrate that the bumpy details produced by the
“bumpy map” are more consistent with the original bumpy texture than by the method of height map.
Supported partially by the National Natural Science Foundation of China (Grant Nos. 60533030, 60825203, 60572104), National
High-Tech Research & Development Program of China (Grant No.2006AA01Z317), Science and Technology Development Program of Education
Commission in Beijing (Grant No. KM200710005017) 相似文献
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Virtual human is a digital representation of the geometric and behavioral property of human beings in the virtual environment
generated by computer. The research goal of virtual human synthesis is to generate realistic human bodymodels and natural
human motion behavior. This paper introduces the development of the related researches on these two topics, and some progresses
on example based human modeling and motion synthesis, and their applications in Chinese sign language teaching, computeraided
sports training and public safety problem studying. Finally, some hot research topics in virtual human synthesis are presented.
Supported partially by the National High-Tech Research & Development Program of China (Grant Nos. 2006AA01Z336, 2007AA01Z320),
and the National Natural Science Foundation of China (Grant No. 60533070) 相似文献
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A survey on virtual reality 总被引:2,自引:0,他引:2
QinPing Zhao 《中国科学F辑(英文版)》2009,52(3):348-400
Virtual reality (VR) is a scientific method and technology created during the exploration of the nature by human beings to
understand, simulate, and better adapt and use the nature. Based on the analysis on the whole process of VR, this paper presents
different categories of VR problems and a type of theoretical expression, and abstracts three kinds of scientific and technical
problems in VR field. On the basis of foresaid content, this paper also studies current major research objectives, research
results and development trend of VR in the aspects of VR modeling method, VR representation technology, human-machine interaction
and devices, VR development suites and supporting infrastructure, as well as VR applications. Finally, several theoretical
and technical problems that need to be further studied and solved are addressed.
Supported by the National Basic Research Program of China (Grant No. 2009CB320805), the National Natural Science Foundation
of China (Grant Nos. 60533070, 60503066), and the National High-Tech Research & Development Program of China (Grant Nos. 2006AA01Z333,
2006AA01Z311) 相似文献
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Bin Sheng 《计算机科学技术学报》2009,24(3):578-587
In this paper,we present a hybrid representation of image-based models combining the textured planes and the hierarchical points.Taking a set of depth images as input,our method starts from classifying input pixels into two categories,indicating the planar and non-planar surfaces respectively.For the planar surfaces,the geometric coefficients are reconstructed to form the uniformly sampled textures.For nearly planar surfaces,some textured planes,called lumiproxies, are constructed to represent the equiva... 相似文献
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A Trust-Based Approach to Estimating the Confidence of the Software System in Open Environments 总被引:1,自引:0,他引:1 下载免费PDF全文
Emerging with open environments, the software paradigms, such as open resource coalition and Internetware, present several novel characteristics including user-centric, non-central control, and continual evolution. The goal of obtaining high confidence on such systems is more di?cult to achieve. The general developer-oriented metrics and testing-based methods which are adopted in the traditional measurement for high confidence software seem to be infeasible in the new situation. Firstly, the software develo... 相似文献
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Jia-Hai Yang 《计算机科学技术学报》2009,24(3):482-494
Manageability is an important feature of next generation Internet;management and monitoring of IPv6-based networks are proving a big challenge.While leveraging current IPv4-based SNMP management scheme to IPv6 networks' management need is necessary,it is more urgent to coin a new network management architecture to accommodate the scalability and extensibility requirements of next generation Internet management.The paper proposes a novel network management architecture,IMN(Internet Management Network),whi... 相似文献
19.
Ji Wang Senior Member CCF Xiao-Dong Ma Wei Dong Hou-Feng Xu and Wan-Wei Liu Member CCF 《计算机科学技术学报》2009,24(2):347-356
We present a demand-driven approach to memory leak detection algorithm based on flow- and context-sensitive pointer analysis.
The detection algorithm firstly assumes the presence of a memory leak at some program point and then runs a backward analysis
to see if this assumption can be disproved. Our algorithm computes the memory abstraction of programs based on points-to graph
resulting from flow- and context-sensitive pointer analysis. We have implemented the algorithm in the SUIF2 compiler infrastructure
and used the implementation to analyze a set of C benchmark programs. The experimental results show that the approach has
better precision with satisfied scalability as expected.
This work is supported by the National Natural Science Foundation of China under Grant Nos. 60725206, 60673118, and 90612009,
the National High-Tech Research and Development 863 Program of China under Grant No. 2006AA01Z429, the National Basic Research
973 Program of China under Grant No. 2005CB321802, the Program for New Century Excellent Talents in University under Grant
No. NCET-04-0996, and the Hunan Natural Science Foundation under Grant No. 07JJ1011. 相似文献
20.
Sensor data, typically images and laser data, are essential to modeling real plants. However, due to the complex geometry
of the plants, the measurement data are generally limited, thereby bringing great difficulties in classifying and constructing
plant organs, comprising leaves and branches. The paper presents an approach to modeling plants with the sensor data by detecting
reliable sharp features, i.e. the leaf apexes of the plants with leaves and the branch tips of the plants without leaves,
on volumes recovered from the raw data. The extracted features provide good estimations of correct positions of the organs.
Thereafter, the leaves are reconstructed separately by simply fitting and optimizing a generic leaf model. One advantage of
the method is that it involves limited manual intervention. For plants without leaves, we develop an efficient strategy for
decomposition-based skeletonization by using the tip features to reconstruct the 3D models from noisy laser data. Experiments
show that the sharp feature detection algorithm is effective, and the proposed plant modeling approach is competent in constructing
realistic models with sensor data.
Supported in part by the National Basic Research Program of China (Grant No. 2004CB318000), the National High-Tech Research
& Development Program of China (Grant Nos. 2006AA01Z301, 2006AA01Z302, 2007AA01Z336), Key Grant Project of Chinese Ministry
of Education (Grant No. 103001) 相似文献