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  • Journal article
    Zeheb E, Shorten R, Sajja SSK, 2012,

    Strict positive realness of descriptor systems in state space (vol 83, pg 1799, 2010)

    , INTERNATIONAL JOURNAL OF CONTROL, Vol: 85, Pages: 612-612, ISSN: 0020-7179
  • Conference paper
    Aditomo A, Calvo RA, Reimann P, 2011,

    Collaborative writing: Too much of a good thing? Exploring engineering student's perceptions using the Repertory Grid

    , Pages: 128-135

    Students' perceptions of technology-supported collaborative writing (CW) and peer reviewing are important because these perceptions affect adoption decisions, initial engagement, and continued reliance on collaboration/peer feedback as a learning resource. This paper describes and demonstrates the utility of the Repertory Grid Technique to probe such perceptions. Combining interviews and written surveys, this study uncovered constructs that engineering students' use to think about CW/peer-reviewing, and interesting patterns of relations among those constructs. For instance, while students perceived activities that involve the construction of personal arguments (such as CW) to be exciting and effective for learning, they also judged such activities to be time-consuming and stressful. This study also found interesting differences in the construct systems of high- and low-performing students. © ISLS.
  • Conference paper
    Brezing A, Childs P, Yim H, Bland PW, Rau PLPet al., 2011,

    Approaches to a cross-cultural engineering design theory

    , Pages: 487-492

    Engineering Design Theory as an integral part of design education serves the purpose of structuring actions and thinking processes in order to increase the efficiency of development processes and the quality of developed products. In many institutions in Europe and the U.S.A., problem-oriented process models based on the approach of functional decomposition have complemented teaching approaches that rely on studying standard solutions such as machine elements. If one assumes that these models have been designed to suit the thought habits and educational traditions in the cultural spheres of their origin, their validity in the context of the globalization of engineering education must be discussed. Especially with regards to "Western" and "Asian" cultures, Nisbett [1] substantiates the existence of profound cognitive differences that might be relevant for design education and practice. Summarizing some of Nisbett's assertions, Westerners are more likely to rely on categorizing and individualizing objects and applying formal logic in any situation, whereas Asians prefer not to disentangle objects from their context in favour of a more holistic view of the world. This paper explores the consequences of such cultural differences in the context of product design and development to add plausibility to the authors' own observations from teaching practice with students from China, Germany, South Korea, Thailand and the United Kingdom. The discussion focuses on the applicability of the established model of the Engineering Design Process, narrowing the scope of Design Theory but broadening on the view that different design practices are attributed solely to differences in social interactions.
  • Conference paper
    Childs P, Fountain R, 2011,

    Commercivity

    , Pages: 3-8

    Creativity can be defined as the ability to imagine or invent something new of value. In the engineering domain, for example, in common with many workplace and social experiences, creativity is both sought after and resisted. In essence creativity represents a significant risk and yet in the fast moving business climate no creativity is even riskier. Essential to realising financial or societal value from an idea, is definition and embodiment of the details that enable the idea to be realised in practice. This paper explores the tensions involved with creativity, the value and use of creativity tools and the importance of design in realising commercial potential. This can be embodied in the moniker commercivity, the commercial exploitation of creativity through the implementation of game-changing and sustainable ideas. This paper accompanies the conference keynote. The subject matter builds on a set of ideas developed in collaboration between Rod Fountain, a serial entrepreneur and Peter Childs. The interviews were conducted for a forthcoming book on commerce and creativity. Commercivity is a registered trademark.
  • Conference paper
    Deterding S, Dixon D, Khaled R, Nacke Let al., 2011,

    From game design elements to gamefulness: Defining "gamification"

    , Pages: 9-15

    Recent years have seen a rapid proliferation of mass-market consumer software that takes inspiration from video games. Usually summarized as "gamification", this trend connects to a sizeable body of existing concepts and research in human-computer interaction and game studies, such as serious games, pervasive games, alternate reality games, or playful design. However, it is not clear how "gamification" relates to these, whether it denotes a novel phenomenon, and how to define it. Thus, in this paper we investigate "gamification" and the historical origins of the term in relation to precursors and similar concepts. It is suggested that "gamified" applications provide insight into novel, gameful phenomena complementary to playful phenomena. Based on our research, we propose a definition of "gamification" as the use of game design elements in non-game contexts. © 2011 ACM.
  • Conference paper
    Casagrande D, Pellegrino FA, Astolfi A, 2011,

    Hamiltonian dynamics for robot navigation

    , Pages: 118-123, ISSN: 1948-3449

    We describe a methodology to plan the trajectory of a robot moving in a two-dimensional space. The robot has to reach a target avoiding obstacles. We show that if the position of the target and of the obstacles in known a priori, then a Hamiltonian function can be constructed and used to define the trajectory. We consider both the static case, namely the case in which both the target and the obstacles are fixed, and the dynamic case, namely the case in which the target or the obstacles move. We prove that in both cases the target can be reached in finite time. The paper is enriched by several examples that illustrate the discussion. © 2011 IEEE.
  • Conference paper
    Aurisicchio M, Eng NL, Nicolas JCO, Childs PRN, Bracewell RHet al., 2011,

    On the functions of products

    , 18th International Conference on Engineering Design (ICED), Publisher: Design Society, Pages: 443-455, ISSN: 2220-4334
  • Conference paper
    Picinali L, 2011,

    Acquisition of spatial knowledge of architectural spaces via active and passive aural explorations by the blind

    , Pages: 1311-1316, ISSN: 2221-3767

    Navigation within a closed environment requires analysis of a variety of acoustic cues, a task that is well developed in many visually impaired individuals, and for which sighted individuals rely almost entirely on visual information. Focusing on the needs of the blind, the creation of cognitive maps for spaces such as home or office buildings can be a long process, for which the individual may repeat various paths numerous times. While this action is typically performed by the individual on-site, it is of some interest to investigate to what point this task can be performed offsite, at the individual's discretion. In short, is it possible for an individual to learn an architectural environment without being physically present? If so, such a system could prove beneficial for preparing for navigation in new and unknown environments. A comparison of three learning scenarios has been performed: in-situ real displacement, passive playback of recorded navigation (binaural and Ambisonic), and active navigation in virtual auditory environment architecture. For all conditions, only acoustic cues are employed. This research is the result of collaboration between researchers in psychology and acoustics on the issue of interior spatial cognition.
  • Journal article
    Budzisz L, Stanojevic R, Schlote A, Baker F, Shorten Ret al., 2011,

    On the Fair Coexistence of Loss- and Delay-Based TCP

    , IEEE-ACM TRANSACTIONS ON NETWORKING, Vol: 19, Pages: 1811-1824, ISSN: 1063-6692
  • Journal article
    Talj R, Ortega R, Astolfi A, 2011,

    Passivity and robust PI control of the air supply system of a PEM fuel cell model

    , AUTOMATICA, Vol: 47, Pages: 2554-2561, ISSN: 0005-1098
  • Journal article
    Kokotovic PV, Astolfi A, 2011,

    David Mayne: Half a century of creativity

    , ANNUAL REVIEWS IN CONTROL, Vol: 35, Pages: 149-152, ISSN: 1367-5788
  • Journal article
    Timm K, Myant C, Spikes HA, Grunze Met al., 2011,

    Particulate lubricants in cosmetic applications

    , Tribology International, Vol: 44, Pages: 1695-1703, ISSN: 1879-2464

    Polymer powders are commonly added to cosmetic formulations to improve product performance and skin feel. This study investigates the effect of particle concentration and size on the lubricating properties of powder suspensions. Results are reported for various particle sizes and concentrations.When the tribological contact was fully immersed the addition of particles had no effect. However different behaviour was observed when the contact was only partially lubricated. In this case, a three-stage friction coefficient curve was observed. By varying the particle size and concentration it was shown that the duration and magnitude of each stage can be controlled.
  • Journal article
    Gallego C, Pinson P, Madsen H, Costa A, Cuerva Aet al., 2011,

    Influence of local wind speed and direction on wind power dynamics - Application to offshore very short-term forecasting

    , APPLIED ENERGY, Vol: 88, Pages: 4087-4096, ISSN: 0306-2619
  • Journal article
    Rossi F, Colaneri P, Shorten R, 2011,

    Pade Discretization for Linear Systems With Polyhedral Lyapunov Functions

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 56, Pages: 2717-2722, ISSN: 0018-9286
    • Cite
    • Citations: 10
  • Journal article
    Mai L, Xu X, Han C, Luo Y, Xu L, Wu YA, Zhao Yet al., 2011,

    Rational Synthesis of Silver Vanadium Oxides/Polyaniline Triaxial Nanowires with Enhanced Electrochemical Property

    , NANO LETTERS, Vol: 11, Pages: 4992-4996, ISSN: 1530-6984
  • Journal article
    Van Zalk N, Van Zalk MHW, Kerr M, 2011,

    Socialization of Social Anxiety in Adolescent Crowds

    , JOURNAL OF ABNORMAL CHILD PSYCHOLOGY, Vol: 39, Pages: 1239-1249, ISSN: 0091-0627
  • Journal article
    Van Zalk N, Kerr M, 2011,

    Shy Adolescents' Perceptions of Parents' Psychological Control and Emotional Warmth: Examining Bidirectional Links

    , MERRILL-PALMER QUARTERLY-JOURNAL OF DEVELOPMENTAL PSYCHOLOGY, Vol: 57, Pages: 375-401, ISSN: 0272-930X
  • Journal article
    Myant CW, underwood R, fan J, cann Pet al., 2011,

    Lubrication of metal-on-metal hip joints: The effect of proteincontent and load on film formation and wear

    , Journal of the Mechanical Behavior of Biomedical Materials, Vol: 6, Pages: 30-40, ISSN: 1751-6161

    Lubricant films were measured for a series of bovine serum and protein containing (albumin, globulin) saline solutions for CoCrMo femoral component sliding against a glass disc. Central film thickness was measured by optical interferometry as a function of time (constant mean speed: 0 and 10 mm/s) and variable mean speed (0–50 mm/s). The effect of load (5–20 N) on film thickness was also studied. The development of the wear scar on the CoCrMo surface was monitored by measuring the width of the contact zone during the film thickness tests. The results showed film thickness increased with time for both the static and sliding tests. Films formed in the static, loaded test were typically in the range of 3–40 nm. The globulin containing solutions formed the thickest films. In the sliding tests a wear scar rapidly formed on the implant component for the bovine serum and albumin fluids, negligible wear was observed for the globulin solutions. Film thickness increased with sliding time for all test solutions and was much greater than predicted by isoviscous EHL models. The film increase was found to correlate with increasing wear scar size and thus decreasing contact pressure. A new lubricating mechanism is proposed whereby during sliding the fluid undergoes bulk phase separation rheology, so that an elevated protein phase forms in the inlet zone. This protein phase is a high-viscosity biphasic matrix, which is periodically entrained into the contact forming a thick protective hydro-gel film. One of the main findings of this study is that film thickness was very sensitive to load; to a much greater extent than predicted by EHL models. Thus film formation in MoM hip joints is very susceptible to high contact pressures which might be due to implant misalignment and edge-loading.
  • Conference paper
    Kormushev P, Ugurlu B, Calinon S, Tsagarakis N, Caldwell DGet al., 2011,

    Bipedal Walking Energy Minimization by Reinforcement Learning with Evolving Policy Parameterization

    , Pages: 318-324
  • Conference paper
    Oron-Gilad T, Porat T, Fern L, Draper M, Shively J, Silbiger J, Rottem-Hovev Met al., 2011,

    Tools and Techniques for MOMU (Multiple Operator Multiple UAV) Environments; an Operational Perspective

    , Proceedings of the Human Factors and Ergonomics Society Annual Meeting
  • Journal article
    Timm K, Myant C, Spikes HA, Schneider M, Ladnorg T, Grunze Met al., 2011,

    Cosmetic powder suspensions in compliant, fingerprintlike contacts

    , BIOINTERPHASES, Vol: 6, Pages: 126-134, ISSN: 1934-8630
  • Conference paper
    King CK, Griggs WM, Shorten RN, 2011,

    A Kalman-Yakubovich-Popov-type lemma for systems with certain state-dependent constraints

    , 49th IEEE Conference on Decision and Control (CDC), Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: 2107-2111, ISSN: 0005-1098
  • Conference paper
    Kormushev P, Ugurlu B, Calinon S, Tsagarakis NG, Caldwell DGet al., 2011,

    Bipedal walking energy minimization by reinforcement learning with evolving policy parameterization

    , 2011 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2011), Publisher: IEEE, Pages: 318-324
  • Journal article
    Vincent CL, Pinson P, Giebel G, 2011,

    Wind fluctuations over the North Sea

    , INTERNATIONAL JOURNAL OF CLIMATOLOGY, Vol: 31, Pages: 1584-1595, ISSN: 0899-8418
  • Journal article
    Shorten R, Corless M, Sajja S, Solmaz Set al., 2011,

    On Pade approximations, quadratic stability and discretization of switched linear systems

    , SYSTEMS & CONTROL LETTERS, Vol: 60, Pages: 683-689, ISSN: 0167-6911
    • Cite
    • Citations: 13
  • Journal article
    Paolella A, George C, Povia M, Zhang Y, Krahne R, Gich M, Genovese A, Falqui A, Longobardi M, Guardia P, Pellegrino T, Manna Let al., 2011,

    Charge Transport and Electrochemical Properties of Colloidal Greigite (Fe<sub>3</sub>S<sub>4</sub>) Nanoplatelets

    , CHEMISTRY OF MATERIALS, Vol: 23, Pages: 3762-3768, ISSN: 0897-4756
  • Journal article
    Riedinger A, Leal MP, Deka SR, George C, Franchini IR, Falqui A, Cingolani R, Pellegrino Tet al., 2011,

    "Nanohybrids" Based on pH-Responsive Hydrogels and Inorganic Nanoparticles for Drug Delivery and Sensor Applications

    , NANO LETTERS, Vol: 11, Pages: 3136-3141, ISSN: 1530-6984
  • Journal article
    Van Zalk N, Kerr M, Tilton-Weaver L, 2011,

    Shyness as a moderator of the link between advanced maturity and early adolescent risk behavior

    , SCANDINAVIAN JOURNAL OF PSYCHOLOGY, Vol: 52, Pages: 341-353, ISSN: 0036-5564
  • Journal article
    Korobchevskaya K, George C, Diaspro A, Manna L, Cingolani R, Comin Aet al., 2011,

    Ultrafast carrier dynamics in gold/iron-oxide nanocrystal heterodimers

    , APPLIED PHYSICS LETTERS, Vol: 99, ISSN: 0003-6951
  • Journal article
    Mai L, Yang F, Zhao Y, Xu X, Xu L, Hu B, Luo Y, Liu Het al., 2011,

    Molybdenum oxide nanowires: synthesis & properties

    , MATERIALS TODAY, Vol: 14, Pages: 346-353, ISSN: 1369-7021

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