Systematic literature reviews in software engineering – A systematic literature review

BackgroundIn 2004 the concept of evidence-based software engineering (EBSE) was introduced at the ICSE04 conference.AimsThis study assesses the impact of systematic literature reviews (SLRs) which are the recommended EBSE method for aggregating evidence.MethodWe used the standard systematic literature review method employing a manual search of 10 journals and 4 conference proceedings.ResultsOf 20 relevant studies, eight addressed research trends rather than technique evaluation. Seven SLRs addressed cost estimation. The quality of SLRs was fair with only three scoring less than 2 out of 4.ConclusionsCurrently, the topic areas covered by SLRs are limited. European researchers, particularly those at the Simula Laboratory appear to be the leading exponents of systematic literature reviews. The series of cost estimation SLRs demonstrate the potential value of EBSE for synthesising evidence and making it available to practitioners.     

A framework to uncover multiple alternative clusterings

Machine Learning - Clustering is often referred to as unsupervised learning which aims at uncovering hidden structures from data. Unfortunately, though widely being used as one of the principal...     

LWIR HgCdTe on Si detector performance and analysis

We have fabricated a series of 256 pixel×256 pixel, 40 μm pitch LWIR focal plane arrays (FPAs) with HgCdTe grown on (211) silicon substrates using MBE grown CdTe and CdSeTe buffer layers. The detector arrays were fabricated using Rockwell Scientific’s double layer planar heterostructure (DLPH) diode architecture. The 78 K detector and focal plane array (FPA) performance are discussed in terms of quantum efficiency (QE), diode dark current and dark current operability. The FPA dark current and the tail in the FPA dark current operability histograms are discussed in terms of the HgCdTe epitaxial layer defect density and the dislocation density of the individual diode junctions. Individual diode zero bias impedance and reverse bias current-voltage (I-V) characteristics vs. temperature are discussed in terms of the dislocation density of the epitaxial layer, and the misfit stress in the epitaxial multilayer structure, and the thermal expansion mismatch in the composite substrate. The fundamental FPA performance limitations and possible FPA performance improvements are discussed in terms of basic device physics and material properties.     

Chemical constitution of the oils from superior and inferior flaxseeds. (a) (b)

Summary All seed oils of the Bison flax variety contained a higher percentage of oleic acids and a lower percentage of linolenic acids than the Abyssinian Yellow flax variety. Abyssinian Yellow seeds yielded oils which contained a relatively low percentage of oleic acid and a higher per cent of linolenic acid than the Bison variety grown in the same locality. The amount of unsaturation in an oil, or its iodine number, appears to be a varietal characteristic, and the components of the oil are blended by nature to give a certain degree of unsaturation which can be varied by growing the flax plants under different environmental conditions. (a) Paper No. …, Journal Series, Minnesota Agricultural Experiment Station. (b) Condensed from a thesis presented to the Graduate School of the University of Minnesota by R. A. Gross, in partial fulfillment of the requirements for the degree of Doctor of Philosophy, March, 1937.     

Stress relaxation behavior and low cycle fatigue behavior of bulk SAC 305

Bulk Sn_96.5Ag₃Cu_0.5 samples were mechanically tested to investigate the effect of temperature, frequency and applied stress on the low cycle fatigue and stress relaxation behavior and the corresponding microstructure. Samples were tested under a variety of parameters including applied stresses between 8 and 80 MPa, temperatures of 25, 50, 100 and 150 °C and frequencies of 1, 0.1 and 0.01 Hz, respectively. Samples used for the stress relaxation behavior exhibited plastic behavior with increased softening behavior with increased stress levels, increased temperature and lower frequencies. Bayesian analysis revealed that stress relaxation behavior could be expressed in general by the following expression: ?σ = AN ^B In the previous expression, Bayesian analysis showed that the testing frequency has an exponential dependency while the temperature has a power law dependency on the parameters A and b. The results of the low cycle fatigue study showed that life decreased with increased applied stress, decreased frequency and increased temperature. Bayesian analysis revealed that the low cycle fatigue behavior could be described by the following expression: ?σ = G(logN) ^m . Additionally, Bayesian analysis showed that the testing frequency and temperature both have a power law dependency on the parameters G and m.     

The challenge of e-participation in the digital city: Exploring generational influences among community telecentre users

A primary challenge for the development of e-government and the digital city is participation by low-income, older and technology-challenged citizens. This paper reports on the role of inter-generational interactions in community telecentres in facilitating low-income, older and technology-challenged citizens in gaining access and using digital city infrastructure. Our research also finds that virtual communities are playing a role in supporting e-participation among older, technology-challenged citizens. We examine the influence and interaction of members of offline communities, who use telecentres, on virtual community participation. These communities and telecentres can provide support for the provision of e-services and the development of the digital city. We explore these issues based on empirical field research in community-based telecentres in a developing country. Inter-generational interactions are explored through an analysis using social networks, social identity and social representations theories.