Disassembly

—A Worm is a standalone malware that replicates itself and does not need a host to propagate. The prevailing detection approach uses fixed size sequence of characters extracted from the worm as a signature. Although very fast, the signature detection approach is ineffective for zero day attacks. Building upon our previous work to use data mining techniques for malware detection, we present a comparison of variable length instruction sequence to fixed size n-grams to detect worms. We define a sequence as a series of instructions till a branch is ennountered. Our results indicated that using the variable length sequences as features to a machine learning classifier provided better results than using fixed length n-grams. We built and compared several tree based classifiers and were able to achieve 95.6% detection rate on novel worms using the variable length instruction sequences.

Lines, thin regions of approximately-uniform width
and colour, are important in the visual interpretation
of information. Lines are a primary feature of many
objects, and are used to convey semantic
information in the human world, e.g. road markings.
In order to interpret such information, an efficient
method is desired for the detection of lines under
this basic definition, independent of the colour and
shape of the lines to be detected. A method of
obtaining the centre-line and width of arbitrarilycoloured and -curving salient lines is described in
this paper. However, this method alone is shown to
be inadequate for its originally-intended purpose,
the detection of wires in the disassembly of end-oflife electronics, due to complications such as
twisted wires and the large number of other lines
present in images taken during assembly. Examples
are also provided of the application of the described
method to other contexts.

Tourism infrastructure is generally regarded as the physical element that is created or made to cater for visitors. The way in which design and construction of tourism infrastructure, particularly buildings are currently carried out in Nigeria tends to be haphazard, wasteful and largely unscientific. One major observation is that most tourism infrastructure in the country are not designed for ease of disassembly, thereby creating sustainability problems for designers and other stakeholders. The negative environmental impacts of wastages associated with such design and construction practices are substantial and this could exacerbate, considering the high rate of urbanization and the present quest to be among the twenty most industrialized nations in the World by 2020. The implication of the 2020 agenda is that the tourism industry in Nigeria would witness unprecedented construction activities. Considering the present experience of the industrialized countries, the current constructio...

Disassembly, as one of the core steps in the End of Life (EOL) activities, has been a popular topic of research in both industrial and academic areas. It not only reduces product lifecycle cost, but also substantially influences environmental impact. Although different methods have been proposed for tackling different aspects of the disassembly planning problems, certain gaps still exist. For example, in the case of the disassembly sequencing, traditional methods focus mainly on the geometry and topology constraints, but omit the important technical constraints like force (gravity), connector type, etc.; it makes these methods less efficient and realistic. Also, the determination of an optimal disassembly sequence requires an extensive exchange and sharing of the disassembly related knowledge among the different stakeholders like manufacturers, product designers, maintenance staffs and material engineers. A mechanism to support such information interoperability is important in the d...

During maintenance operations, technicians have to work as quickly as possible. But they are often stopped during disassembly by blocked bolts or studs. This paper examines causes of blockage and suggests new method for disassembling bolted joint in this case. Several methods are analyzed and tested with finite element simulations. An experimental protocol to test a new disassembling method is also introduced in this paper.