In this paper, the concept of network security and security structures of OSI and Internet is introduced, and various threats confronting the computer network are also discussed. Several kinds of network information security technologies, including firewall technology, virtual private network, intrusion detection system, data encryption technology, identity authentication and security protocol etc. are also examined. The security of internal network is the biggest problem in the construction of each network. The solution to this problem lies in setting up a firewall. The theory of a firewall and the approach to its actualization is studied. Intrusion detection system, an important part of the computer network security system, has gained extensive attention. IDS monitors the computer and network traffic for intrusion and suspicious activities. It not only detects the intrusion from the extranet hacker, but also the intranet users. The emergence of virtual private network paves the way for realizing secure connection of LAN quickly and at a relatively low cost. The concept, function, key techniques, including the tunnel technology, and the ways to realize VPN are expounded in this paper. Also introduced is the data encrypt network technology, which is called the soul of computer network security, such as digital digest, digital signature, digital certificate, digital encrypt arithmetic and so on. At the same time, the principle and the process of implementing network security by digital certificate and digital signature, the basic principle and characters of security protocols, and finally, three of the security protocols, concerning the security problems in network, IPsec, SLL and SET are analyzed in detail Computer network system should be a system of dynamic defence, both dynamic and static, passive as well as active, and even offensive, combined with management and technology.

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The real option heuristc has been suggested for more than 10 years in western countries,but the various problems in its use in corporate strategic management have made it doubtable and unacceptable.

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On the basis of these approaches, we discuss and implement DKIRS Dyn...

我們采用局部上下文分析法從檢索結果中提取與查詢相關的特征詞，然后采用包含方法和相似方法判定這些特征詞之間的相關關系妓女久久久久亚洲中文字幕，并利用所提取的概念與概念之間的關系以及用戶的反饋信息動態(tài)地構造和更新知識庫XNXX老师HD高清。

After theoretic analyzing support vector machine technique, the equipollence of support vector classification and regression problems is proofed, and a uniformed expression of support vector machine problem is gotten. The noise stained case is studied emphatically, and the experiment shows that a better result will be obtained by assigning weight factor to fit noise distribute characteristic. A multi-multiplier minimal optimization algorithm for norm-1 problems is deduced, and a kind of improved Gilbert geometric algorithm for norm-2 problems is introduced, which is applied in regression problems successfully.

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H. Erikson (1946, 1950) introduced identity to psychology and set up ego-identity, the concept of self-identity has been applied to social psychology, personality psychology, developmental psychology, educational psychology, counseling psychology and cultural psychology.

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Based on conceptual ideas from researchers such as Greenwood and Hinings (1996), Ferlie et a!.(1996), and Brunsson and Sahlin-Andersson (2000), we use a framework that focuses attention on the concepts of the construction of identity, hierarchy and rationality to systematically analyse the various aspects of transformations of professional organizations.

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In my opinion, the "relative concept" of time was not considered prior to the "absolute concept" of time, and imprecisely they looked like a double-sides coin.

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After a century, the kinetic theory of gases was also won the rapid development of .1857, the Clausius for the first time clearly statistical concepts, derived gas pressure, volume and temperature inter-correct relations, but also in 1858 introduced the concept of .1859 free path of molecular motion, the Maxwell velocity distribution law is derived, established the mathematical theory of transport processes .1868, the Boltzmann velocity distribution law was introduced in the gravitational field .

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The artist′s formal strategy here of enlarging the characteristics of media products logically leads Wang Du to play on the notions of scale and monumentality.

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At first, the conception of test task was proposed to explain the evident difference of parallel efficiency of test tasks. Then, the guideline of parallelism was developed, to weigh the parallelizability of different test tasks, as well as guiding the configuration of instrument source in the parallel test system. At last, with an example, the rationality of parallelizability and the practicability of parallelism were proved.

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