In a time where more business is conducted over the Internet, the security of such systems, for instance electronic money transfer, becomes critical. A firewall serves as a frontline of the security measures that can be taken by an organisation in order to secure the integrity of a private network. This report describes methods of evaluating the security of a firewall. The existing methods on t...

The paper provides a logical characterisation of distributed processing of SPARQL queries. The principal notion analysed is that of a distribution scheme; a pair consisting of an evaluation rule and a distribution function. Different choices of evaluation rules and distribution functions give different federation schemes that are proved to be sound and complete wrt. different selections of RDF ...

in this paper, we introduce a multiresolution watermarking method for copyright protection of digital images. the method is based on the discrete wavelet transform. a noise type gaussian sequence is used as watermark. to embed the watermark robustly and imperceptibly, watermark components are added to the significant coefficients of each selected subband by considering the human visual system (...

abstract background and objective: proficiency testing schemes as a part of quality system in clinical and research laboratory centers provides the opportunity to evaluate the quality of test results. in this paper, we try to introduce the proficiency testing schemes as a useful method for achieving standardization and homogenization of test results in clinical and research laboratory centers. ...

117. An assessment of value for money for the 1993 to 1996 decommissioning scheme can be measured against a number of criteria. These include a further examination of what capacity would have been reduced in the absence of decommissioning (additionality both in actual and net cost terms), contributions to decommissioning expenditure from the Government, the European Commission and from fisherme...

In this article, we describe a number of indexing experiments based on indexing terms other than simple keywords. These experiments were conducted as one step in validating a linguistically-motivated indexing model. The problem is important but not new. What is new in this approach is the variety of schemes evaluated. It is important since it should not only help to overcome the well-known prob...

The monitoring of the quality of service in a multi-domain network supervises the multi-domain service performance. A multi-domain service is a service that crosses several domains which can be managed by different providers. Since each domain can be managed with its own policies and may require confidentialit of its topology and its monitoring processes, we propose that the monitoring architec...

Human perceptual performance was tested with images of nighttime outdoor scenes. The scenes were registered both with a dual band (visual and near infrared) image intensified low-light CCD camera (DII) and with a thermal middle wavelength band (3-5 Pm) infrared (IR) camera. Fused imagery was produced through a pyramid image merging scheme, in combination with different colour mappings. For all ...

This paper presents a method for evaluating functions based on piecewise polynomial approximation with a novel hierarchical segmentation scheme. The use of a novel hierarchy scheme of uniform segments and segments with size varying by powers of two enables us to approximate nonlinear regions of a function particularly well. This partitioning is automated: efficient look-up tables and their coef...