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1.
Malware-Autoren setzen zunehmend Verschleierungsmechanismen wie Komprimierung, Verschlüsselung oder sich selbst modifizierenden
Programmcode ein, welche das Auffinden der Malware durch herk?mmliche Virenerkennungsverfahren wie zum Beispiel die signaturbasierte
Suche sehr mühsam und teilweise sogar erfolglos erscheinen lassen. Ein erfolgversprechender Ansatz, um auch unbekannte Viren,
Würmer oder Trojaner zu erkennen, ist die heuristische Analyse 相似文献
2.
The last decade has placed the superiority of graphical user interfaces over traditional text-based approaches beyond dispute. In almost all contexts, users have found graphical interfaces easier to learn, faster to use, and less error-prone. However, it has been shown that the creation of powerful graphical interfaces takes up to 80% of the time required to develop an application. In our work, we seek to extend the benefits of graphical interaction to the next layer of computer user—the interface designer. Our work in this area is distinguished from other efforts by two important differences. First, while other efforts focus primarily on the design of standard user interfaces, our approach emphasizes the creation of unique and innovative interfaces by supporting, among other things, arbitrary user-designed graphical representations, direct specification of animation, and digitized sound. Second, our goal is to cater to the nonprogrammer. Thus, we address a challenging trade-off: maximizing power and flexibility in an extremely simple environment. We explore the utility of the prototype object-oriented paradigm, a high-level userinterface language, and a direct-manipulation programming environment in this context. 相似文献
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The refractory metals Nb, Ta, Mo, and W dissolve C, N, and O by forming interstitial solid solutions. The concentration of
these components can be increased or decreased by annealing treatments, depending on the partial pressure of gases such as
N2, O2, H2O, CH4, or CO and on the temperature of the specimen. New results in binary and ternary systems combined with those obtained in
the last few years now provide most of the data needed for the thermochemical analysis of the solid solution phases and for
the establishment of p-T-c phase diagrams. The mechanisms of the gas-metal reactions and the general feature of the constitution
diagrams are similar for all refractory metals. However, marked differences exist between group Va metals niobium and tantalum
and group VIa metals molybdenum and tungsten in the absolute values and temperature dependence of the equilibrium pressure
of gaseous species and therefore also in the amount of gas absorbed. The data now available for the estimation of the final
content of interstitials in solid solution after annealing treatments are compiled and discussed.
On leave from the Max-Planck-Institut fur Metallforschung, Institut fur Sondermetalle, Stuttgart, Germany 相似文献
6.
Untersuchung von 20-t-Blöcken mit unterschiedlichen Aluminiumzugaben für die Feindesoxydation während der Erstarrung in der Kokille. Oberflächenfehler von halbberuhigtem Stahl. Bildung von oxydischen Einschlüssen dicht unter der Blockoberfläche und im Blockinnern. Maßnahmen zur Beeinflussung der Einschlußausbildung. 相似文献
7.
Reduktionsversuche an auf Eisen aufoxydiertem Wüstit mit Kohlenmonoxid-Kohlendioxid-Stickstoff- und Wasserstoff-Wasserdampf-Stickstoff-Gasgemischen. Mikroskopische Beobachtung der anreduzierten Wüstitoberfläche. Beeinflussung der Reduktion durch die Oberflächentopographie des Wüstits. Analogie der Wüstitreduktion unter gleichgewichtsnahen Bedingungen zur Kristallverdampfung. 相似文献
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An analytical one-dimensional model was developed to predict the effect of the different kiln variables on the regenerative heat transfer by the wall in a rotary kiln. The basis of this model is introducing a lumped capacity layer with infinite conductivity in radial direction. The thickness of this layer is determined from the heat penetration in a semi-infinite body. The parameters considered are kiln diameter, rotational speed, filling degree, material properties of the wall, and gas-to-wall and wall-to-solid heat transfer. From the model, it can be concluded that in technical rotary kilns, the regenerative heat transfer by the wall is much smaller than the direct heat flow from the gas. Nevertheless, under the slumping condition and in laboratory kilns, the effect of the wall can be up to 40%. 相似文献
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