• Wandering pattern sensing at S-band

      Yang, Xiaodong; Shah, Syed Aziz; Ren, Aifeng; Zhao, Nan; Fan, Dou; Hu, Fangming; Ur-Rehman, Masood; von Deneen, Karen M.; Tian, Jie; Xidian University; et al. (Institute of Electrical and Electronics Engineers Inc., 2017-12-27)
      Increasing prevalence of dementia has posed several challenges for care-givers. Patients suffering from dementia often display wandering behavior due to boredom or memory loss. It is considered to be one of the challenging conditions to manage and understand. Traits of dementia patients can compromise their safety causing serious injuries. This paper presents investigation into the design and evaluation of wandering scenarios with patients suffering from dementia using an S-band sensing technique. This frequency band is the wireless channel commonly used to monitor and characterize different scenarios including random, lapping, and pacing movements in an indoor environment. Wandering patterns are characterized depending on the received amplitude and phase information of that measures the disturbance caused in the ideal radio signal. A secondary analysis using support vector machine is used to classify the three patterns. The results show that the proposed technique carries high classification accuracy up to 90% and has good potential for healthcare applications.
    • A wearable antenna for mmWave IoT applications

      Ur-Rehman, Masood; Kalsoom, Tahera; Malik, Nabeel A.; Safdar, Ghazanfar Ali; Chatha, Hasan Tariq; Ramzan, Naeem; Abbasi, Qammer Hussain; University of Bedfordshire; University of West of Scotland; Islamic University; et al. (Institute of Electrical and Electronics Engineers Inc., 2019-01-14)
      A compact and flexible millimeter-wave (mmWave) antenna with central resonance frequency of 60 GHz has been designed. The performance of the antenna is evaluated numerically. The antenna exhibits a broad bandwidth of 9.8 GHz with a gain of 9.6 dBi. The antenna also provides good radiation coverage throughout the band of interest achieving a maximum efficiency of 70%. Simple structure, flexible geometry, ease of fabrication and excellent performance make it a well- suited option for body-centric IoT applications.
    • Web-based visual analytics of lifestyle data in MyHealthAvatar

      Zhao, Youbing; Parvinzamir, Farzad; Zhao, Xia; Deng, Zhikun; Ersotelos, Nikolaos; Dong, Feng; Clapworthy, Gordon J. (ICST, 2015-12-22)
      MyHealthAvatar is a project designed to collect lifestyle and health data to promote citizen's wellbeing. As a lifetime companion of citizens the amount of data to be collected is large. It is almost impossible for citizens, patients and doctors to view, utilise and understand these data without proper visual presentation and user interaction. Visual analytics of lifestyle data is one of the key features of MyHealthAvatar. This paper presents the visual analytics components in MyHealthAvatar to facilitate health and lifestyle data presentation and analysis, including 3D avatar, dashboard, diary, timeline, clock view and map. These components can be used cooperatively to achieve flexible visual analysis of spatial temporal lifestyle and health data.
    • What does the pedagogical agent say?

      Christopoulos, Athanasios; Conrad, Marc; Shukla, Mitul; University of Bedfordshire (Institute of Electrical and Electronics Engineers Inc., 2019-11-14)
      The successful employment of Virtual Reality Environments in distance education contexts led to the development of various frameworks and taxonomies related to the Virtual-Learning approach. However, when it comes to Blended or 'Hybrid' Virtual Learning (HVL) scenarios, where the learners are concurrently co-present both in the physical and in the virtual environment, the lines are hard to be drawn as this has been a relatively unexplored area. Considering the aforementioned change in the setup of the educational context, different implications, challenges and outcomes are expected to be observed. Motivated by this shortcoming, we conducted a series of experiments with Computer Science and Technology students and investigated the impact of interactions on learners' motivation to engage with the 3D virtual world and the educational activities by extension. In this paper, we discuss students' preconceptions towards the inclusion of 3D Virtual Learning Environments in the context of their studies and further elicit their thoughts related to the impact of the 'hybrid' interactions. In addition, we investigate the educational value of different Non-Player Characters (Pedagogical Agents) and their impact on the attractiveness of the virtual world and the educational tasks. The concluding remarks provide guidance to educators and instructional designers who work in such setups or consider to employ Pedagogical Agents. To this end, employing Pedagogical Agents requires careful consideration as they need to be meaningful and fully incorporated in the learner's task. Another take-away message concerns the elements that foster a situated learning experience as they are associated with immersive experiences.
    • μECM process investigation considering pulse signal features and EDL capacitance

      Mortazavi, Mina; Ivanov, Atanas (Springer, 2019-05-22)
      Micro-electrochemical machining (μECM) is a controlled anodic dissolution process between electrodes. The anodic dissolution, which follows Faraday’s laws of electrolysis, depends on characteristics of the electrodes materials, electrolyte properties, and pulse signal features. μECM is a challenging multidisciplinary task in which quality of the process and features of the finished products depend on a complex relation between different machining parameters including, electrical features of pulse signal, chemical features of electrolyte, physical features of tools, and thermodynamic features of the process. In this paper, influential machining parameters will be reviewed briefly, and pulse signal features will be investigated and analyzed considering the behavior of the electrode-electrolyte interface. The interface has capacitive feature and plays an important role in micromachining performance. The proposed simulation work presents the requirement for the pulse on-time in order to provide the maximum possible charging-discharging time for the capacitive behavior of the electrode-electrolyte interface.