10,619 research outputs found
Towards experience management for Search Engine Optimisation
Websites of Small and Medium-sized Enterprises (SMEs) can gain an added advantage by getting listed in the search engine’s results page during the search sessions of the searchers. The Search Engine Optimisation (SEO) enables websites to become visible in search engines during search sessions for its featured products or services. It generates additional revenue for the websites. SEO is a complex technique. Its knowledge and experience gained from optimising websites in the past is highly valuable and applicable to optimise websites. This paper dis- cusses the problem of optimisation of websites based on the experience gained by the authors from optimisation of several case study websites. Process models have been generated in order to capture experience of implementing essential elements of SEO and to explain the procedure of implementation of the fundamental on-page SEO techniques that yielded results for the case study websites
Nuclear Structure in the Framework of the Unitary Correlation Operator Method
Correlations play a crucial role in the nuclear many-body problem. We give an
overview of recent developments in nuclear structure theory aiming at the
description of these interaction-induced correlations by unitary
transformations. We focus on the Unitary Correlation Operator Method (UCOM),
which offers a very intuitive, universal and robust approach for the treatment
of short-range correlations. We discuss the UCOM formalism in detail and
highlight the connections to other methods for the description of short-range
correlations and the construction of effective interactions. In particular, we
juxtapose UCOM with the Similarity Renormalization Group (SRG) approach, which
implements the unitary transformation of the Hamiltonian through a very
flexible flow-equation formulation. The UCOM- and SRG-transformed interactions
are compared on the level of matrix elements and in many-body calculations
within the no-core shell model and with Hartree-Fock plus perturbation theory
for a variety of nuclei and observables. These calculations provide a detailed
picture of the similarities and differences as well as the advantages and
limitations of unitary transformation methods.Comment: 72 pages, 31 figure
Nuclear Structure - "ab initio"
An ab-initio description of atomic nuclei that solves the nuclear many-body
problem for realistic nuclear forces is expected to possess a high degree of
predictive power. In this contribution we treat the main obstacle, namely the
short-ranged repulsive and tensor correlations induced by the realistic
nucleon-nucleon interaction, by means of a unitary correlation operator. This
correlator applied to uncorrelated many-body states imprints short-ranged
correlations that cannot be described by product states. When applied to an
observable it induces the correlations into the operator, creating for example
a correlated Hamiltonian suited for Slater determinants. Adding to the
correlated realistic interaction a correction for three-body effects,
consisting of a momentum-dependent central and spin-orbit two-body potential we
obtain an effective interaction that is successfully used for all nuclei up to
mass 60. Various results are shown.Comment: 9 pages, Invited talk and poster at the international symposium "A
New Era of Nuclear Structure Physics" (NENS03), Niigata, Japan, Nov. 19-22,
200
The Odds are Odd: A Statistical Test for Detecting Adversarial Examples
We investigate conditions under which test statistics exist that can reliably
detect examples, which have been adversarially manipulated in a white-box
attack. These statistics can be easily computed and calibrated by randomly
corrupting inputs. They exploit certain anomalies that adversarial attacks
introduce, in particular if they follow the paradigm of choosing perturbations
optimally under p-norm constraints. Access to the log-odds is the only
requirement to defend models. We justify our approach empirically, but also
provide conditions under which detectability via the suggested test statistics
is guaranteed to be effective. In our experiments, we show that it is even
possible to correct test time predictions for adversarial attacks with high
accuracy
Data literacy in the smart university approach
Equipping classrooms with inexpensive sensors for data collection can provide students and teachers with the opportunity to interact with the classroom in a smart way. In this paper two approaches to acquiring contextual data from a classroom environment are presented. We further present our approach to analysing the collected room usage data on site, using low cost single board computer, such as a Raspberry Pi and Arduino units, performing a significant part of the data analysis on-site. We demonstrate how the usage data was used to model specifcic room usage situation as cases in a Case-based reasoning (CBR) system. The room usage data was then integrated in a room recommender system, reasoning on the formalised usage data, allowing for a convenient and intuitive end user experience based on the collected raw sensor data. Having implemented and tested our approaches we are currently investigating the possibility of using (XML)Schema-informed compression to enhance the security and efficiency of the transmission of a large number of sensor reports generated by interpreting the raw data on-site, to our central data sink. We are investigating this new approach to usage data transmission as we are aiming to integrate our on-going work into our vision of the Smart University to ensure and enhance the Smart University's data literacy
Two-phased knowledge formalisation for hydrometallurgical gold ore process recommendation and validation
This paper describes an approach to externalising and formalising expert knowledge involved in the design and evaluation of hydrometallurgical process chains for gold ore treatment. The objective was to create a case-based reasoning application for recommending and validating a treatment process of gold ores. We describe a twofold approach. Formalising human expert knowledge about gold mining situations enables the retrieval of similar mining contexts and respective process chains, based on prospection data gathered from a potential gold mining site. Secondly, empirical knowledge on hydrometallurgical treatments is formalised. This enabled us to evaluate and, where needed, redesign the process chain that was recommended by the first aspect of our approach. The main problems with formalisation of knowledge in the domain of gold ore refinement are the diversity and the amount of parameters used in literature and by experts to describe a mining context. We demonstrate how similarity knowledge was used to formalise literature knowledge. The evaluation of data gathered from experiments with an initial prototype workflow recommender, Auric Adviser, provides promising results
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