Public grid computing participation: An exploratory study of determinants

Using the Internet, “public” computing grids can be assembled using “volunteered” PCs. To achieve this, volunteers download and install a software application capable of sensing periods of low local processor activity. During such times, this program on the local PC downloads and processes a subset of the project's data. At the completion of processing, the results are uploaded to the project and the cycle repeats.     

Cryptography and cryptographic protocols

We survey the paradigms, approaches and techniques used to conceptualize, define and provide solutions to natural cryptographic problems. We start by presenting some of the central tools (e.g., computational difficulty, pseudorandomness, and zero-knowledge proofs), and next turn to the treatment of encryption and signature schemes. We conclude with an extensive treatment of secure cryptographic protocols both when executed in a stand-alone manner and when many sessions of various protocols are concurrently executed and controlled by an adversary. The survey is intended for researchers in distributed computing, and assumes no prior familiarity with cryptography.Received: June 2001, Accepted: July 2002,     

Syntactic mismatches in machine translation

This paper addresses one of the central problems arising at the transfer stage in machine translation: syntactic mismatches, that is, mismatches between a source-language sentence structure and its equivalent target-language sentence structure. The level at which we assume the transfer to be carried out is the Deep-Syntactic Structure (DSyntS) as proposed in the Meaning-Text Theory (MTT). DSyntS is abstract enough to avoid all types of divergences that result either from restricted lexical co-occurrence or from surface-syntactic discrepancies between languages. As for the remaining types of syntactic divergences, all of them occur not only interlinguistically, but also intralinguistically; this means that establishing correspondences between semantically equivalent expressions of the source and target languages that diverge with respect to their syntactic structure is nothing else than paraphrasing. This allows us to adapt the powerful intralinguistic paraphrasing mechanism developed in MTT for purposes of interlinguistic transfer.     

混凝土输送泵液压系统特点分析和性能改进探讨

ＢＳＡ１４０６Ｅ大象泵和ＨＢＴ６０楚天泵均属于电动活塞式大排量、中远程距离的混凝土输送泵，在国内得到广泛地应用。本在分析液压系统原理和功能的基础上，结合使用中出现的问题，从改善性能更加实用和走向国际市场的角度出发，探讨了两种系统的优点和缺陷以及改进方案。     

Product Platform Identification and Development for Mass Customization

This paper is mainly concerned with the Identification of an embryonic product platform from a family of products whose composition, configuration and characteristics are represented by Attributed Graphs. The problem becomes that of identifying the largest isomorphic sub-graph with the highest similarity. An algorithm is proposed for solving this problem together with several novel concepts.     

Agens Faber: Toward a Theory of Artefacts for MAS

Human intelligence has evolved along with the use of more and more sophisticated tools, allowing Homo Faber (from Homo Habilis to Homo Sapiens Sapiens) to cope with environment changes, as well as to adapt the environment to his needs. Analogously, in this seminal paper we introduce the notion of Agens Faber, conveying the idea that agent intelligence should not be considered as separated by the agent ability to perceive and affect the environment—and so, that agent intelligence is strictly related to the artefacts that enable, mediate and govern any agent (intelligent) activity.

Along this line, we first discuss the notion of artefact for MAS in general, then we try to devise out the admissible / required / desirable features of an artefact for MAS. We elaborate on the many sorts of possible relations between agents and artefacts, focusing in particular on the issue of the rational exploitation of artefacts, and also rough out a possible taxonomy of artefacts for MAS.     

理论——实习一体化教学探索

理论－实习一体化教学方式，即采用专业理论教学与实习教学同步进行，专业理论教学与实习教学有机结合的教学形式，有利于学生对专业知识的掌握和形成，有效克服理论知识与实际操作的“两张皮”现象，是适合技工教育的一种有效教学形式。     

国外油气化探新进展

本文概述国外油气地球化学勘查的现状。在油气化探基础理论研究方面，国外学者提出了一些新的概念和认识。Ｍ．Ｄ．Ｍａｔｔｈｅｗｓ认为烃类迁移机制可分为弥散式和会聚式２类，并着重探讨了烃类通过会聚式迁移到达近地表时，其渗逸速率、气泡效应、分散相的成分和性质等对近地表层和水柱中烃类背景水平及异常形成的影响。Ｒ．Ｔｏｍｐｋｉｎｓ提出了油气藏地层电池和氧化还原房概念。有的学者对某些具体化探方法的原理提出了新的认识，如汞烃共生说等等。在油气化探应用效果方面，国外大量实例说明，应用非常规物化探之后，预测成功率明显提高，综合油气勘查是今后油气勘探的发展方向。近年有的学者将化探的微生物法扩展到储层研究，较准确地了解地下储层的性质与动态。油气化探技术虽然取得了重要进展，但在诸如烃类迁移机制、干扰因素的影响、应用领域的扩展等等问题上还有待进一步探讨和研究。     

Almost k-wise independence versus k-wise independence

We say that a distribution over {0,1}ⁿ is (ε,k)-wise independent if its restriction to every k coordinates results in a distribution that is ε-close to the uniform distribution. A natural question regarding (ε,k)-wise independent distributions is how close they are to some k-wise independent distribution. We show that there exist (ε,k)-wise independent distributions whose statistical distance is at least n^O(k)·ε from any k-wise independent distribution. In addition, we show that for any (ε,k)-wise independent distribution there exists some k-wise independent distribution, whose statistical distance is n^O(k)·ε.