2,886 research outputs found
ROCRSSI++: An Efficient Localization Algorithm for Wireless Sensor Networks
No full textLocalization within a Wireless Sensor Network consists of defining the position of a given set of sensors by satisfying some non-functional requirements such as (1) efficient energy consumption, (2) low communication or computation overhead, (3) no, or limited, use of particular hardware components, (4) fast localization, (5) robustness, and (6) low localization error. Although there are several algorithms and techniques available in literature, localization is viewed as an open issue because none of the current solutions are able to jointly satisfy all the previous requirements. An algorithm called ROCRSSI appears to be a suitable solution; however, it is affected by several inefficiencies that limit its effectiveness in real case scenarios. This paper proposes a refined version of this algorithm, called ROCRSSI++, which resolves such inefficiencies using and storing information gathered by the sensors in a more efficient manner. Several experiments on actual devices have been performed. The results show a reduction of the localization error with respect to the original algorithm. This paper investigates energy consumption and localization time required by the proposed approach
Efficient Range-free RSSI Localization Technique for Wireless Sensor Networks
No full textLocalization within a Wireless Sensor Network consists of defining the position of a given set of sensors by satisfying some non-functional requirements such as (i) eff
State-based robustness testing of IaaS cloud platforms
No full textAn uncountable number of services are deployed over cloud platforms and provided to millions of consumers. As this paradigm spreads over, the quality of provided services becomes a primary concern. Testing helps in making software reliable, but it has been overlooked for cloud. In this paper, we present a method for the robustness testing of software platforms for IaaS cloud. The method stresses the importance of considering the state for these systems, which are characterized by phase-based interactions of many software components with multiple concurrent users. Applied to a real cloud platform, the method exposes failures hard to uncover with common robustness testing approaches
Impact of Malfunction on the Energy Efficiency of Batch Processing Systems
No full textEnergy efficiency of large processing systems is usually assessed as the relation between a performance and a
power consumption metric, neglecting malfunction. Execution
failures have a tangible cost in terms of wasted energy, however. They are often managed through fault tolerance mechanisms, which in turn consume electricity.
We introduce the consumability attribute for batch processing systems, encompassing performance, consumption, and dependability aspects altogether. We propose a metric for its quantification and a methodology for its analysis. Using a real 500-node batch system as a case study, we show that consumability is representative of both efficiency and effectiveness, and we show the usefulness of the proposed metric and the suitability of the proposed methodology
Cost-Benefit Analysis of Virtualizing Batch Systems: Performance-Energy-Dependability Trade-offs
No full textPerformance, energy efficiency, and dependability are key characteristics of batch systems, which can be differently affected when adopting virtualization. Scientific literature usually analyzes the variation with respect to different config- urations of one characteristic, or the trade-off between two. In this paper, instead, we assess the impact of virtualization encompassing all of them. Results show that the joint analysis helps in finding the proper tuning of the system for balancing costs and benefits due to virtualization and related techniques
Who is the author of the 1876 Stefano manuscript?
No full textFor over one hundred years the Stefano manuscript was a private document in the possession of the Baccich family and descendants. It told a story of the 1875 Stefano shipwreck as narrated by the shipwreck survivor and the founding family patriarch Miho Baccich. In these circumstances the question of authorship of the manuscript was immaterial and did not arise as an issue. However, with the publication of the manuscript the author‟s name, or names, need to be formally attributed to it. It turns out that this is not such a clear-cut matter.
As we shall see, all informed sources attributed the authorship, and the ownership, of the manuscript to Miho Baccich. But the manuscript itself was written by Canon Stjepan Skurla – a priest from Miho‟s hometown of Dubrovnik. The question then arises: should Skurla also be considered as an author of the manuscript, or, even as the sole author (as some would have it)
Reproducibility of Software Bugs Basic Concepts and Automatic Classification
No full textUnderstanding software bugs and their effects is important in several engineering activities, including testing, debugging, and design of fault containment or tolerance methods. Dealing with hard-to-reproduce failures requires a deep comprehension of the mechanisms leading from bug activation to software failure. This chapter surveys taxonomies and recent studies about bugs from the perspective of their reproducibility, providing insights into the process of bug manifestation and the factors influencing it. These insights are based on the analysis of thousands of bug reports of a widely used open source software, namely MySQL Server. Bug reports are automatically classified according to reproducibility characteristics, pro- viding figures about the proportion of bugs hardly reproducible, about their features, and about their evolution over releases
Is Node Ratio Superior to Numeric Criterion in Evaluating Lymph Node Involvement in Gastric Cancer?
No full textIs node ratio superior to numeric criterion in evaluating lymph node involvement in gastric cancer? . Corresponding author: Stefano Rausei, MD, Department of Surgery ? University of Insubria Viale L. Borri 57, 21100 ? Varese, Italy. Tel. +39.332.393229; Fax +39.332.260260
Predicting suicide in adolescence: Mood disorders, personality pathology and narcissistic functioning
No full textPredicting suicide in adolescence: Mood disorders, personality pathology and narcissistic functioning Riccardo Williams (Dynamic & Clinical Psychology, Rome, Italy) M. P. Casini, G. Serra, C. Frattini, S. Vicari, E. Ronningstam
Objective
This study has 4 objectives: a) To verify whether the mood disorders/traits have a differential predictive role with respect to three clinical groups of adolescents: Suicidal Ideation, NSSI with suicidal ideation, Suicidal attempts. b) To verify whether the categorical and dimensional traits of personality pathology have a differential predictive role with respect to three clinical groups of adolescents: Suicidal Ideation, NSSI with suicidal ideation, Suicidal attempts. c) To verify whether the dinensions of pathological narcissism have a differential predictive role with respect to three clinical groups of adolescents: Suicidal Ideation, NSSI with suicidal ideation, suicidal attempts. d) To verify whether mood conditions, personality pathology, narcissistic functioning discriminate between the motivations sustaining sucidal ideations and behaviors.
Methods
Sample
A sample of 40 adolescents referred at the Adolescent Psychiatric In-Patient and Mood Disorders Units of the Pediatric Hospital Bambino Gesù of Rome have been recruited with the method of subsequent admissions. Adolescents presenting a QI below 90, a generalized developmental disorder have been excluded from the study.
Instruments
a) Assessment of suicidal ideation and conducts: - Columbia Suicide Severity Rating Scale (CSSRS): - The Deliberate Self-Harm Inventory (DSHI);
b) Assessment of the presence of categorical and dimensional symptoms of mood disorders (and other relevant psychopathological conditions): - Kiddie-SADS PL: clinician’s assessment of diagnosis for Axis I Disorders - Kiddie SADS Mania Rating Scale (K-SADS-MRS): - Child Depression Rating Scale Revised (CDRS-R):
c) Categorical and dimensional Assessment of Personality Pathology - SCID II (DSM5-version): questionnaire and interview for personality disorders diagnosis (both categorical and dimensional- number of symptoms measures will be considered). - Diagnostic Interview for Narcissism (DIN)
Results
Borderline Personality Disorder presents a significant association with suicidal attempts. The narcissistic dimension presented significant associations with suicidal ideation and conducts.
Conclusion
In order to predict suicidal conducts in adolescence, several factors should be taken into consideration with a specific role to be attributed to narcissistic functioning typical of this developmental stag
Framework Linking Open Innovation Strategic Goals with Practices
No full textThe year 2003 marked a significant milestone for the management community: Henry Chesbrough's Open Innovation paradigm offered academics and professionals a new perspective on established models in innovation management. Over the years, Open Innovation spread significantly, establishing itself as one of the fundamental models in innovation management. It emerges both theo- retically and practically, with several nuances and perspectives that extended the original model. De- spite its popularity, the debate is still open and growing, with thousand papers published over the years and hundreds just in 2019. This field of research is playing a keystone role in innovation management literature to the point that among researchers and practitioners’ new lenses of interpretation are needed. Thus, this chapter aims at adopting a systematic literature review methodology to systematise Open Innovation strategic goals and practices. It helps R&D professionals choose the right Open Innovation perspective for what they need, seeing all the different sides of this leading paradigm. The results show how three main strategic goals can be identified (i) identifying new directions, (ii) strengthening the market position, and (iii) enhancing the innovation process
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