Detecting Metamorphic Viruses using Profile Hidden Markov Models By Srilatha Attaluri Metamorphic computer viruses “mutate” by changing their structure every time they propagate. Unlike other viruses, they use code obfuscation techniques on the body of the virus and do not exhibit a common signature. With the advent of construction kits, it is easy to generate various metamorphic strains of a v...

It is often difficult to verify the solutions of computationally intensive mathematical optimization problems. Metamorphic testing is a technique to verify software test output even when a complete testing oracle is not present. We apply metamorphic testing to a classic optimization problem, the quadratic assignment problem (QAP). A number of metamorphic relations for the QAP are described in d...

This paper is an attempt to understand the effectiveness of teaching metamorphic properties in a senior/graduate software engineering course classroom environment through gauging the success achieved by students in identifying these properties on the basis of the lectures and materials provided in class. The main findings were: (1) most of the students either misunderstood what metamorphic prop...

High-grade, migmatitic paragneisses (820°C, 8 kbar peak conditions) of the Valhalla metamorphic core complex experienced the retrograde net transfer reaction (ReNTR): garnet + melt + K-feldspar = sillimanite + biotite + plagioclase during cooling and crystallization of the melt, resulting in an increase in the Fe/(Fe + Mg) of both garnet and biotite at their margins. Diffusion profiles generate...

Recent work in Barrovian metamorphic terranes has found that rocks experience peak metamorphic temperatures across several grades at similar times. This result is inconsistent with most geodynamic models of crustal over-thickening and conductive heating, wherein rocks which reach different metamorphic grades generally reach peak temperatures at different times. Instead, the presence of addition...

Metamorphic diamonds come up to our knowledge only in the last two decades. For the first time, a complex investigation was made in the Kokchetav Massiv in nothern Kazachstan. Basing on these data, three models for diamond genesis have been carried out. 1. The premetamorphic model 2. The metastability model 3. The UHPM model