Auffinden von verschleierter Malware

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     

Conjugate heat transfer through nano scale porous media to optimize vacuum insulation panels with lattice Boltzmann methods

Due to reduced thermal conductivity, vacuum insulation panels (VIPs) provide significant thermal insulation performance. Our novel vacuum panels operate at reduced pressure and are filled with a powder of precipitated silicic acid to further hinder convection and provide static stability against atmospheric pressure. To obtain an in depth understanding of heat transfer mechanisms, their interactions and their dependencies inside VIPs, detailed microscale simulations are conducted.Particle characteristics for silica are used with a discrete element method (DEM) simulation, using open source software Yade-DEM, to generate a periodic compressed packing of precipitated silicic acid particles. This aggregate packing is then imported into OpenLB (openlb.net) as a fully resolved geometry, and used to study the effects on heat transfer at the microscale. A three dimensional Lattice Boltzmann method (LBM) for conjugated heat transfer is implemented with open source software OpenLB, which is extended to include radiative heat transport. The infrared intensity distribution is solved and coupled with the temperature through the emissivity, absorption and scattering of the studied media using the radiative transfer equation by means of LBM. This new holistic approach provides a distinct advantage over similar porous media approaches by providing direct control and tuning of particle packing characteristics such as aggregate size, shape and pore size distributions and studying their influence directly on conduction and radiation independently. Our aim is to generate one holistic tool which can be used to generate silica geometry and then simulate automatically the thermal conductivity through the generated geometry.     

Manufacturing and assembly of the plasma- and outer vessel of the cryostat for Wendelstein 7-X

Wendelstein 7-X is an advanced helical stellarator, which is presently under construction at the Greifswald branch of IPP. A set of 70 superconducting coils arranged in five modules provides a twisted shaped magnetic cage for the plasma and allows steady state operation. Operation of the magnet system at cryogenic temperatures requires a cryostat which provides thermal protection and gives access to the plasma. The main components of the cryostat are the plasma vessel, the outer vessel, the ports, and the thermal insulation. The German company, MAN Diesel & Turbo SE Deggendorf (former MAN DWE GmbH Deggendorf), is responsible for the manufacture and assembly of the plasma vessel, the outer vessel and the thermal insulation. This paper describes the manufacturing and assembly technology of the plasma and outer vessel of the cryostat for Wendelstein 7-X.     

Virtualisierung im Future Internet Virtualisierungsmethoden und Anwendungen

Das Future Internet stellt sich der Herausforderung, die Verkn?cherung und die Unzul?nglichkeiten des heutigen Internets zu überwinden. Es soll beispielsweise robust, zuverl?ssig und fehlertolerant sein und dabei Dienste auf energieeffiziente Weise erbringen. Zus?tzlich müssen auch neue Anforderungen antizipiert werden, die zukünftige Dienste und Netze stellen, um der Entwicklung von neuen Diensten und Protokollen nicht im Wege zu stehen. Erforderlich ist hierbei die Entwicklung einer ?u?erst variablen und rekonfigurierbaren Netzwerkarchitektur, die eine m?glichst einfache und autonome Netzwerkverwaltung mit einschlie?t. Die Virtualisierung von Host- und Netzwerkressourcen stellt in diesem Zusammenhang eine der Schlüsseltechnologien dar, mit der diese notwendige Flexibilit?t erreicht werden kann. Virtualisierung verbirgt die Komplexit?t von physikalischen Netzwerkinfrastrukturen und stellt homogene, flexible und dynamisch rekonfigurierbare virtuelle Ressourcen zur Verfügung. Dieser Artikel gibt einen überblick über verschiedene Host- und Netzwerkvirtualisierungsmethoden. An mehreren Beispielen wird aufgezeigt, wie verschiedene Herausforderungen angegangen werden k?nnen, die sowohl im heutigen Internet als auch im Internet der Zukunft eine Rolle spielen.     

Experience made in determining the static modulus of elasticity of concrete

It is reported on the experience made in determining the static modulus of elasticity of normal weight concrete (made of gravel and crushed basalt) and lightweight concrete according to the RILEM Test Method. The influences of the curvature and the creep on the modulus of elasticity are studied specially. Thereby it has become obvious that the secant modulus varies negligibly between the lower stress σ_u and the upper stress σ₀ = f/3 on the second loading, and that the systematic error occurring by the forced interruptions of 30 seconds according to the RILEM Test Method cannot be advocated for scientific investigations. The modulus of elasticity according to the RILEM Test Method has also been compared with other possible determinations of the modulus of elasticity of concrete.     

Aufnahme an Tränklösung und Sicherheitsgrad der Tränkung beim Saftverdrängungsverfahren mit neuzeitlichen Salzgemischen

Zusammenfassung Nach Angabe eines einfachen Verfahrens, um bei der Tr?nkung nach dem Saftverdr?ngungsverfahren die aufgenommene L?sungs- und damit Salzmenge für H?lzer verschiedenster Art und Herkunft schnell zu ermitteln, werden Ergebnisse derartiger Untersuchungen mitgeteilt, die zeigen, da? bei der in Deutschland gebr?uchlichen Durchführung des Saftverdr?ngungsverfahrens mit chromarsenhaltigen Salzgemischen die im Splintholz der Nadelh?lzer aufgenommene Salzmenge das 12- bis 15 fache derjenigen ist, die gerade noch eine F?ulnis verhindert, und nach einer gründlichen Auslaugung die Sicherheit gegen F?ulnis immer noch eine 8- bis 10 fache ist. Mitteilung aus dem Laboratorium der Atlasmaste K.-G.     

Impairment of long-term associative memory in aging snails (Lymnaea stagnalis).

Age-dependent impairment in learning and memory functions occurs in many animal species, including humans. Although cell death contributes to age-related cognitive impairment in pathological forms of aging, learning and memory deficiencies develop with age even without substantial cell death. The molecular and cellular basis of this biological aging process is not well understood but seems to involve a decline in the aging brain's capacity for experience-dependent plasticity. To aid in resolving this issue, we used a simple snail appetitive classical conditioning paradigm in which the underlying molecular, cellular, and neural network functions can be directly linked to age-associated learning and memory performance (i.e., the Lymnaea stagnalis feeding system). Our results indicate that age does not affect the acquisition of appetitive memory but that retention and/or consolidation of long-term memory become progressively impaired with advancing age. The latter phenomenon correlates with declining electrophysiological excitability in key neurons controlling the feeding behavior. Together, these results present the Lymnaea feeding system as a powerful paradigm for investigations of cellular and molecular foundations of biological aging in the brain. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Variability, covariation, and invariance with respect to coordinate systems in motor control: Reply to Smeets and Louw (2007).

In their comment on the tolerance-noise covariation (TNC) method for decomposing variability by H. Müller and D. Sternad (2003, 2004b), J. B. J. Smeets and S. Louw (see record 2007-01135-017) show that covariation (C), as defined within the TNC method, is not invariant with respect to coordinate transformations and contend that it is, therefore, meaningless. Although the observation is correct, their interpretation is misleading in the following ways: (a) They equate covariation C with the known statistical quantity covariance and noise (N) with standard deviations. The two quantities C and N are conceptually different statistical measures. (b) Dependency on the reference frame is not only a feature of C but of all 3 components. However, such dependency is ubiquitous in motor control. (c) As the frame of reference in biological systems is poorly understood, the TNC method may afford evaluation of different coordinates for control. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Functional recovery of respiratory behavior during axonal regeneration in snails (Lymnaea stagnalis) is experience dependent.

This study investigated the role of experience in recovery of pulmonary respiration during axonal regeneration in Lymnaea stagnalis. Pulmonary respiration occurs when snails break the water surface and open the lung orifice, the pneumostome. It was shown that axotomy of all the axons innervating the pneumostome and surrounding area prevents the occurrence of lung respiration in 69% of snails. In the remaining 31%, lung respiration persisted, indicating that peripheral components alone are capable of initiating pneumostome openings and closures. Five weeks postsurgery, all snails with previous nerve crushes showed opening of the pneumostome with normal latency after breaking the water surface. However, prevention of pulmonary respiration during the recovery period dramatically changed the recovered behavior. Thus, experience in pulmonary respiration during axonal regeneration plays a role in the recovery of this behavior. (PsycINFO Database Record (c) 2010 APA, all rights reserved)