1,721,064 research outputs found
Workshop on maintenance of aspect oriented systems
No full textAspect Oriented Programming (AOP) constructs introduce new kinds of relationships among traditional units, e.g. classes in Object Oriented (OO) code, and aspects due to the weaving among aspects’ code fragments, such as advice or inter-type declarations, and the traditional system units. These relationships can be difficult to identify making hard and risky the maintenance operations because the impact of a change could be very difficult to evaluate. New methods, techniques and tools (or the adaptation of the existing ones) are needed to successfully face and overcome the new problems and difficulties that AOP constructs could pose to code maintenance. This workshop intends to act as a forum for the presentation and discussion of new approaches to effectively support the maintenance of AO systems, and to promote joint researches and experimental studies about this topic
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Assessment of AC Corrosion Probability in Buried Pipelines with a FEM-Assisted Stochastic Approach
Full text linkIn this paper, a stochastic approach is combined with field theory and circuit methods to study how the geometrical and electrical properties of holidays (defects or pores in the insulating coating) in a metallic pipeline influence the probability of exceeding the current density limit for corrosion. Three-dimensional FEM simulations are conducted to assess the influence of the shape and electrical resistivity of the pore on the computed spread resistance value. The obtained results are then used to evaluate the probability of exceeding a given current density value for different sizes of pore and soil resistivities. Finally, a case of 50 Hz interference along a pipeline-transmission line routing is examined. The probabilistic approach presented in this paper allows the pipeline sections more subjected to the induced AC corrosion risk to be identified to be used as an auxiliary tool for adopting preventive protection countermeasures. Lastly, unlike most papers devoted to assessing electromagnetic interference on pipelines, the present work uses a probabilistic rather than a deterministic approach, representing its main novelty aspect
A System for Generating Reverse Engineering Tool: A Case Study of Software Modularisation
No full textThe paper presents a case study in the development of software modularisation tools. The tools are produced by using a system for developing code analysers that uses a database to store both a no-loss fine-grained intermediate representation and the analyses' results. The analysers are automatically generated from a high-level specification of the desired analyses expressed in a domain-oriented language. We use a program intermediate representation, called F(p), as the user-visible data base conceptual model. Analysers are specified in a declarative language, called F(p) – ell, which allows the specification of an analysis in the form of a traversal of an algebraic expression, with accesses to, and stores of, the database information the algebraic expression indexes. A foreign language interface allows the analysers to be embedded into C programs. This is useful, for example, to implement the user interface of an analyser or to facilitate interoperation of the generated analysers with pre-existing tools
A two-step procedure for the selection of innovative high temperature heat transfer fluids in solar tower power plants
No full textThis work compares with a two-step procedure the performance of different Heat Transfer Fluids (HTF) for high temperature receiver applications (up to 715 °C) in advanced Solar Tower (ST) plants. The most promising molten salts and liquid metals are initially selected and ranked according to their performance, estimated with different Figures of Merit (FoM) available in literature or newly defined. For the best performing fluids, different hydraulic configurations and tube diameters at fixed receiver size are tested. The optimized external tubular receiver configuration for each HTF is then implemented in a ST plant and its performance is assessed through a detailed techno-economic analysis, considering the use of a direct thermal energy storage system and of a sCO2 based power cycle. As a second step, the yearly electricity yield and the LCOE are evaluated for two different sites. Results show NaCl–MgCl2 as the best option for the considered type of plant with a LCOE of 151 $/MWh, which is anyhow 10% higher than the reference Solar Salts case
An Incremental Object-Oriented Migration Strategy for RPG Legacy Systems
No full textWe present a strategy for incrementally migrating legacy systems to object-oriented platforms. The migration process consists of six sequential phases and encompasses reverse engineering and reengineering activities. The aim of reverse engineering is to decompose programs into components implementing the user interface and components implementing application domain objects. The identification of objects is centred around persistent data stores and exploits object-oriented design metrics. Wrapping is the core of the reengineering activities. It makes new systems able to exploit existing resources, thus allowing an incremental and selective replacement of the identified objects. The migration strategy has been defined and experimented within the project ERCOLE (Encapsulation, Reengineering and Coexistence of Object with Legacy) on legacy systems developed in RPG for the IBM AS/400 environment
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
