Detection of replay attacks in cyber-physical systems using a frequency-based signature

This paper proposes a frequency-based approach for the detection of replay attacks affecting cyber-physical systems (CPS). In particular, the method employs a sinusoidal signal with a time-varying frequency (authentication signal) into the closed-loop system and checks whether the time profile of the frequency components in the output signal are compatible with the authentication signal or not. In order to carry out this target, the couplings between inputs and outputs are eliminated using a dynamic decoupling technique based on vector fitting. In this way, a signature introduced on a specific input channel will affect only the output that is selected to be associated with that input, which is a property that can be exploited to determine which channels are being affected. A bank of band-pass filters is used to generate signals whose energies can be compared to reconstruct an estimation of the time-varying frequency profile. By matching the known frequency profile with its estimation, the detector can provide the information about whether a replay attack is being carried out or not. The design of the signal generator and the detector are thoroughly discussed, and an example based on a quadruple-tank process is used to show the application and effectiveness of the proposed method.     

Knowledge-intensive consumer services. Understanding KICS in the innovative global health-care sector

This paper explores a case of knowledge-intensive consumer services (KICS). Services have become less neglected in the economics of technical change and innovation studies in general; nevertheless, the advance of this agenda has been uneven. A significant emphasis has been on knowledge-intensive business services (KIBS). Despite their direct impact on social needs and individual desires, innovation in consumer-oriented services continues to be relatively under-theorized and under-researched. This paper brings into focus the sources and patterns of innovation in those innovative services that target human satisfaction and well-being as a final goal. We show evidence from a little-explored health industry, oral care. We address Malo Clinic, a company specialized in the most complex patient situations and a rare instance of an internationalized firm in the health services business. On the basis of a 20-year thread of corporate history, we find that a wide array of qualitative (interviews, newspaper coverage, marketing material) and quantitative evidence (papers, patents, trademarks) illuminates some of the features that may characterize a particular class of dynamic activities tending to consumers’ needs, expectations and quality of life. We argue that these key characteristics may be on course to become more general as the learning economy spreads to fully embrace the realm of the service sphere. One conclusion is that both the technological and non-technological capabilities underpinning more types of innovation are increasingly becoming coupled in consumer-relevant services.     

Growth,functional capacities and motivation for achievement and competitiveness in youth basketball: an interdisciplinary approach

The interaction of multiple influences on the path to sport success is not yet fully understood by sport scientists. In this study, we examined variation in body size, functional capacities and motivation for achievement, competitiveness and deliberate practice of youth basketball players associated with differences in biological maturity status, chronological age and years of training experience. Reflecting the importance of interactive effects, we examined the relationships between the psychological variables and functional capacities. Fifty-eight male basketball players aged 9.5 to 15.5 years were considered. Variables included chronological age, estimated age at peak height velocity, stature, body mass and sitting height by anthropometry; the Work and Family Orientation and Deliberate Practice Motivation Questionnaires were also used. Finally, the Line Drill test and Yo-Yo Intermittent Recovery level 1 (Yo-Yo IR1) tests were used as functional capacities indicators for basketball. Variance components models derived from series of multilevel linear regression models revealed a substantial variation by maturity status for body size, functional capacities indicators, mastery and will to excel. The influence of estimated maturity status on mastery and will to excel was independent of age and years of experience. In contrast, no relationships were observed between psychological variables and functional capacities indicators. We conclude that growth-related changes are relevant to understanding players´ motivations for achievement, competitiveness and deliberate practice. This should be of interest to those involved in the selection and development of youth basketball players.     

Automatic evaluation of digital libraries with 5SQual

Digital libraries (DLs) are complex information systems which can present changes in their structure, content, and services. These complexities and dynamics make system maintenance a non-trivial task, since it requires periodical evaluation of the different DL components. Generally, these evaluations are customized per system and are performed only when problems occur and administrator intervention is required. This work aims to change the situation. We present 5SQual, a tool which provides ways to perform automatic and configurable evaluations of some of the most important DL components, among them, digital objects, metadata, and services. The tool implements diverse numeric indicators that are associated with eight quality dimensions described in the 5S quality model. Its generic architecture was developed to be applicable to various DLs and scenarios. In sum, the main contributions of this work include: (i) the design and implementation of 5SQual, a tool that validates a theoretical DL quality model; (ii) the demonstration of the applicability of the tool in several usage scenarios; and (iii) the evaluation (with usability specialists) of its graphical interface specially designed to guide the configuration of 5SQual evaluations. We also present the results of interviews conducted with administrators of real DLs regarding their expectations and opinions about 5SQual.     

PRESERVICE TEACHERS’ INSTRUCTIONAL BELIEFS AND EXAMINATION OF CONSISTENCY BETWEEN BELIEFS AND PRACTICES

The purposes of this study were to determine preservice physics teachers’ instructional beliefs and to investigate the relationship between their beliefs and practices. The theoretical framework was based on the combination Haney & McArthur’s (Science Education, 86(6):783–802, 2002) research and Ford’s (1992) motivation systems theory. A multicase study design was utilized for the research in order to focus on a belief–practice relationship within several examples. Semistructured interviews, observations, and preservice teachers’ written documents were used to collect data. Results showed that most preservice teachers held instructional beliefs aligned with constructivist philosophy. Some of the preservice teachers’ beliefs were consistent with their practices while some of them presented different practices from their beliefs in different placements.     

The Effectiveness of Mime‐Based Creative Drama Education for Exploring Gesture‐Based User Interfaces

User interfaces that utilise human gestures as input are becoming increasingly prevalent in diverse computing applications. However, few designers possess the deep insight, awareness and experience regarding the nature and usage of gestures in user interfaces to the extent that they are able to exploit the technological affordances and innovate over them. We argue that design students, who will be expected to envision and create such interactions in the future, are constrained as such by their habits that pertain to conventional user interfaces. Design students should gain an understanding of the nature of human gestures and how to use them to add value to UI designs. To this end, we formulated an ‘awareness course’ for design students based on concepts derived from mime art and creative drama. We developed the course iteratively through the involvement of three groups of students. The final version of the course was evaluated by incorporating the perspectives of design educators, an industry expert and the students. We present the details of the course, describe the development process, and discuss the insights revealed by the evaluations.     

Reinterpreting City as a Critical Ground in Atelier 1 Projects: Some Prospects and Projections on Ankara

This article is based on the critical approaches developed in Atelier 1, an architectural design studio in the Gazi University Faculty of Architecture, Department of Architecture in Ankara, Turkey. The main theme of Atelier 1 Projects in the 2014–15 academic year was the ‘City as a Critical Ground’, in which the city, ground and criticism were discussed within the interdisciplinary theoretical field of architecture. Atelier 1, involving second, third and fourth year undergraduate students, reinterpreted and redesigned the urban ground of Ankara with a critical approach to reveal its unique identities and implicit values. Ground, accepted as the main critical material in the design process, was criticised not only in its physical sense, but also its social, cultural, political, economic, technological and even psychological aspects. The students were able to discover their own design methods from their criticisms of the urban ground, which also allowed them to determine their sites and programmes. In this way, Atelier 1 promoted freedom and flexibility as well as criticality in the design process, and pointed out that the relationship of architecture with city, ground and criticism should be discussed from a new theoretical perspective, primarily in the architectural design studio, as the core of architectural education. Atelier 1, as a theory‐based architectural design studio, motivated the students to develop a critical approach to the urban ground of Ankara so as to replace the rising formalism with criticism in architecture.     

The Factory: an Experimental Studio for Discovering the Other

This article discusses the idea of otherness in design education and introduces a new approach that merges the potentials of collaborative and individual design. The aim is for each individual student to discover how others design to criticise and derive their own ways of designing. Therefore, the discussion here focuses on the process of becoming aware of other designers and the importance of being with others while designing. I call this state the Field of Otherness. It is something that cannot be described or taught; it is a relative and indeterminate zone based on the existence of others. It is a set of potentials in which designers oscillate and their design aspects merge into a multiplicity. In this article I argue that by discovering others, designers encounter each other in the Field of Otherness and this enables them to design diversely. To broaden the discussion within this context, an experimental one‐day project called the Factory is explored. The main idea of the project was to introduce students to the Field of Otherness, in which they would design by continual ‘as ifs’ and oscillations to meet the other; who is precisely unfamiliar, unexpected, unknown and inexperienced. Interviews with students three months after the project are used to investigate the effects. These interviews can also be seen as fragments of the otherness experience of the students.     

What matters for rural teachers and communities? Educational challenges in rural Turkey

This research aims to unearth the educational challenges experienced by teachers and communities in rural Turkey. The research employs Nancy Fraser’s three dimensional justice approach – distribution, recognition and participation – to frame these challenges and to argue that rural challenges go beyond economic rationalities and concerns of infrastructure and resources. The study draws its data from 29 in-depth interviews with 20 teachers working in 16 different villages; 9 interviews with community members; and 2 focus group interviews, 1 with rural dwelling women and the other with rural dwelling men. The findings point out four significant difficulties that impede community and educational development: scarcity of resources; insufficient understanding of social, cultural and economic contexts that constrain educational attempts; lack of collaboration between teacher and communities; and irrelevant education. The study concludes by scrutinising how these difficulties interact with one another and result in marginalisation or casting out of rural lives.     

Exploring fourth graders’ sourcing skills / Un análisis de la capacidad de escrutinio sobre las fuentes de información de los estudiantes de cuarto grado

Acquiring information from the Web creates new educational demands even in elementary school. Children need to scrutinize source information (‘sourcing’) to choose trustworthy information. So far, few studies have documented young readers’ abilities to identify and evaluate source information. With two studies, we seek to gather more evidence on elementary students’ sourcing skills and use. In study 1, we investigate to what extent fourth graders can identify source information and evaluate informants’ expertise and intentions in simplistic, age-appropriate reading tasks. In study 2, we explore whether fourth graders spontaneously apply their sourcing skills when reading simplified multiple documents. Results suggest that fourth graders can successfully identify source information and evaluate informants’ expertise and intentions in simple and direct tasks but fail to apply this ability to more complex and implicit tasks. Implications for information literacy education are discussed.