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Associate Professor Valerie Gay


Valerie Gay has more than 25 years of teaching and research experience in leading research laboratories in Europe and Australia;  

She is the BSc (Honours) IT course coordinator and the director of the mHealth lab in the UTS research centre for Innovation in IT services and Applications (iNEXT).

Academic Qualifications

  • Doctor of Science (Habilitation à Diriger des Recherches), University Pierre et Marie Curie, Paris, France - 1997
  • PhD, University Pierre et Marie Curie, Paris, France - 1991
  • Master of Philosophy (Diplôme d'Etudes Approfondies), University Pierre et Marie Curie, Paris, France - 1987
  • Master of Computer science, University Jules Verne, Amiens, France- 1986

Professional History

  • Associate Professor in Computing Sciences, FEIT, UTS - 1999-2000 / 2003-Now  
  • Associate Professor in Computing Sciences. Teaching: University of Technology, Amiens, Research: Pierre et Marie Curie University, Paris 6, France. 1985-1999 / 2000-2003 
  • Visiting appointments at the University of Twente - The Netherlands (2000-2003, 2007 and 2011) and the Federal University of Espirito Santo (UFES) - Vitória – Brazil (2007 and 2011).

Image of Valerie Gay
Associate Professor, School of Computing and Communications
Core Member, Centre for Innovation in IT Services Applications
BCompSc (Hons) (Le Havre), MCompSc (Amiens), DEA (UPMC), HDR (UPMC), PhD (UPMC)
+61 2 9514 4645

Research Interests

Valerie Gay's research focus  is on the design of networked and mobile applications that contributes to economic and social development.

Her current work addresses 2 national research priorities – promoting and maintaining good health and Frontier technologies for building and transforming Australian industries.

She is the director of the mHealth lab in the UTS research centre for Innovation in IT services and Applications (iNEXT).

Current Research Domains 

  • Design of mobile applications
  • Health informatics
  • Health social media
  • Health and serious game, gamification
  • Mobile Health

Current Projects

Personal Health Monitoring (myFitnessCompanion.com): Personalised, intelligent, innovative, non-intrusive, real time health and fitness monitoring using wireless sensors. 

Emotion-aware Apps (CaptureMyEmotion): Use of sensor technologies and facial expression recognition to sense emotions and create emotion-aware apps. Design of a suite of Apps to provide a very personalised way to help autistic children and their carers understanding and managing their emotions. 

SocialCycle: combining social network, sensors and online information to motivate people to exercise using their bicycle in the city and meet and exchange tips with their friends.

Can supervise: Yes

Valerie Gay has more than 25 years of lecturing experience in Universities of Technology in France  and in Australia. Her experience extends across Computer Science, Telecommunications, Software, Mobile Commerce  and Networking.

She is the BSc (Honours) IT course coordinator.

Current Subjects:

  • Lecturer and coordinator of Contemporary Telecommunications (32702) and Mobile Commerce Technologies (32001)
  • Coordinator of the Honours project (31482)


Pradhan, S. & Gay, V. 2014, 'Introducing Patient and Dentist Profiling and Crowdsourcing to Improve Trust in Dental Care Recommendation Systems' in Trust Management VIII, Springer Berlin Heidelberg, pp. 221-228.


Pradhan, S., Gay, V. & Nepal, S. 2014, 'Improving dental care recommendation systems using trust and social networks', Communications (ICC), 2014 IEEE International Conference on, pp. 4264-4269.
Gay, V.C., Leijdekkers, P. & Wu, Q. 2013, 'Helping Autistic Children Understand Their Emotions Using Facial Expression Recognition and Mobile Technologies', 26th Bled eConference eInnovations, AISeL, Bled, Slovenia, pp. 409-420.
One of the main challenges for autistic children is to identify and express emotions. Many emotion-learning apps are available for smartphones and tablets to assist autistic children and their carers. However, they do not use the full potential offered by mobile technology, such as using facial expression recognition and wireless biosensors to recognise and sense emotions. To fill this gap we developed CaptureMyEmotion, an Android App that uses wireless sensors to capture physiological data together with facial expression recognition to provide a very personalised way to help autistic children learn about their emotions. The App enables children to capture photos, videos or sounds, and simultaneously attach emotion data and a self-portrait photo. The material can then be reviewed and discussed together with a carer at a later stage. CaptureMyEmotion has the potential to help autistic children integrate better in the society by providing a new way for them to understand their emotions.
Pradhan, S., Gay, V.C. & Nepal, S. 2013, 'Social Networking and Dental Care : State of the Art and Analysis of the Impact on Dentists, Dental Practices and their Patients', 26th Bled eConferences, University of Maribor, Bled, Slovenia, pp. 178-189.
Health Social networking sites offering search, reviews and recommendation are gaining popularity. This paper reviews the most popular social networking sites related to dental care. Social networks such as DrOogle and Yelp enable their users to review and rate their dentists and dental practices. Such information is then used to rank and recommend dentists or dental practices to new users/patients. This paper compares the dental care social networking sites in terms of their features and criteria supported for search, reviews and recommendations of dentists or dental practices. Mismatches between features and criteria among different dental care reviews sites are identified, which may cause inconsistency in the recommendations in the dental care. Therefore, this paper proposes a new framework for dynamic dental care recommendation system which takes both local (personalised) and global (crowdsourced) trust into account. It analyses the impact of current social networks on dentists, dental practices and their patients. Finally, it identifies the open issues and challenges that need to be addressed to design a trustworthy recommendation system for both the dental professionals and their patients.
Ahad, M.T., Dyson, L.E. & Gay, V.C. 2013, 'Exploring M-Banking for Rural SMEs from the Bank's Perspective: A Focus Group Study in Bangladesh', Proceedings of the 2013 Pacific Asia Conference on Information Systems, The Association for Information Systems (AIS), AIS Electronic Library (AISeL), pp. 1-14.
There is relatively little known about the m-banking use by the rural small and medium enterprises (SMEs) in Bangladesh. This research fills the gap by presenting the key advantages of using mbanking by the rural SMEs that a bank can offer in Bangladesh. The research also reports on the critical country level-factors, organizational success factors and obstacles in m-banking adoption for rural SMEs. A focus group was interviewed and the data were analysed using NVivo9.The findings indicate that improved banking facility, an opportunity to create employment in rural area, easy settlement of trade between SMEs, better cash management are some important advantages of mbanking for the rural SMEs. Technology and human resource capabilities of the banks together with the development of mobile infrastructure are some influential factors in m-banking development in Bangladesh. This paper also identifies engagement with the SMEs as an important organizational factor in m-banking diffusion for rural SME that have been rarely identified in prior literature. However, the major constraints are the operational constraints such as cash management, policy and regulation and administrative obstacles. Recommendation for a business version m-banking, joint advertisement by the banks and mobile telecom organisations and a regional m-banking platform are also new knowledge in m-banking research. This is one of the few papers from the perspective of a bank, since most of the literature approaches the matter from the consumer standpoint. The outcomes and results of this research will be of potential value to the government, banks and mobile telecommunications in accelerating the development of m-banking in Bangladesh and in other developing countries.
Leijdekkers, P. & Gay, V.C. 2013, 'Capture My Emotion: a Mobile App to Improve Emotion Learning for Autistic Children Using Sensors', 26th IEEE International Symposium on Computer Based Medical Systems, IEEE Computer Society, Piscataway, NJ, pp. 1-4.
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Autism Spectrum Disorder (ASD) is estimated to affect one in eighty-eight children and many mobile apps are available from Google Play or Apple store to help these children and their carer. Our research into apps for autistic children identified that none of the apps use the full potential offered by mobile technology and sensors to overcome one of autisticc children's main difficulty: the identification and expression of emotions. This paper describes a mobile apps called CaptureMyEmotion that enables autistic childrens to take photo, videos or sounds, and at the same time senses their arousal level using a wireless sensor. It also allows the child to comment on their emotion at the time of capture. The app has the potential to help autistic children improve their emotions lerating based on their own pictures, videos or sounds. It gives the carer a means to discuss the identification and expressionn of emotions.
Gay, V., Leijdekkers, P. & Wong, F. 2013, 'Using sensors and facial expression recognition to personalize emotion learning for autistic children.', Stud Health Technol Inform, pp. 71-76.
This paper describes CaptureMyEmotion, an app for smartphones and tablets which uses wireless sensors to capture physiological data together with facial expression recognition to provide a very personalized way to help autistic children identify and understand their emotions. Many apps are targeting autistic children and their carer, but none of the existing apps uses the full potential offered by mobile technology and sensors to overcome one of autistic children's main difficulty: the identification and expression of emotions. CaptureMyEmotion enables autistic children to capture photos, videos or sounds, and identify the emotion they felt while taking the picture. Simultaneously, a self-portrait of the child is taken, and the app measures the arousal and stress levels using wireless sensors. The app uses the self-portrait to provide a better estimate of the emotion felt by the child. The app has the potential to help autistic children understand their emotions and it gives the carer insight into the child's emotions and offers a means to discuss the child's feelings.
Pradhan, S. & Gay, V.C. 2013, 'Towards a New Trust Model for Health Social Networks', The 8th International Conference on Internet and Web Application adn Services, IARIA, Rome Italy, pp. 52-57.
More specifid purpose driven social networking sites have emerged since social networking sites have gained popularity by bringing people with shared interests together to interact. In health care, they are referred as Health Social Networks (HSNs). Given the sensitive nature of health information, trust ist he fundamental for them. The emergence of pervasive and ubiquitous computing environment and overwhelming information available online is helping the health social sites gain popularityat a fast pace. Health social networkers aare willing to create, share or retrieve trustworthy health or lifestyle related information. Therefore, it is essential that trust is stipulated and scrutinised to understand how the users perceive healthcare, how they decide to interact with HSNs. This paper analyses external factors such as perceived information quality, perceived system quality, perceived reputation and perceived trust signs which impact the trust model for HSNs. In particular, 'perceived reputation' based on the factor 'who has recommended the site' is given an emphasis on this paper. It hightlights that popularity of social networking sites is changing the way trust models have been devined in the past. This is because social relationship created via social networking sites are also impacting on choosing the HSNs and how users are sharing health information on these platforms
Felix Navarro, K.M., Gay, V.C., Johnston, B.G., Leijdekkers, P., Vaughan, E.P., Wang, T. & Williams, M. 2013, 'SocialCycle What Can a Mobile App Do To Encourage Cycling', 38th IEEE Conference on Local Computer Networks (LCN 2013) and Workshops, IEEE Computer Society, Sydney Australia, pp. 24-30.
Traffic congestion presents significant enviromnental, social and economic costs. Encouraging people to cycle and use other fonns of alternate transportation is one important aspect of addressing these problems. However, many city councils face significant difficulties in educating citizens and encouraging them to fonn new habits around these alternate fonns of transport. Mobile devices present a great opportunity to effect such positive behavior change. In this paper we discuss the results of a survey aimed at understanding how mobile devices can be used to encourage cycling and/or improve the cycling experience. We use the results of the survey to design and develop a mobile app called SocialCycle, which purpose is to encourage users to start cycling and to increase the number of trips that existing riders take by bicycle
Gay, V. & Leijdekkers, P. 2012, 'Personalised mobile health and fitness apps: lessons learned from myFitnessCompanion.', Stud Health Technol Inform, pp. 248-253.
Smartphones and tablets are slowly but steadily changing the way we look after our health and fitness. Today, many high quality mobile apps are available for users and health professionals and cover the whole health care chain, i.e. information collection, prevention, diagnosis, treatment and monitoring. Our team has developed a mobile health and fitness app called myFitnessCompanion which has been available via Android market since February 2011. The objective of this paper is to share our experience with rolling out a mobile health and fitness app. We discuss the acceptance of health apps by end-users and healthcare industry. We discuss how mobile health apps will be distributed in the near future, the use of Personal Health Record (PHR) systems such as Microsoft HealthVault and the impact of regulations (FDA) on the future of mobile health apps. The paper is based on seven years of experience by the authors as mobile health and fitness application developers and we discuss the challenges and opportunities for app developers in the health industry.
Ahad, M.T., Dyson, L. & Gay, V. 2012, 'Towards an M-banking framework for rural SMEs in Bangladesh', INNOVATION VISION 2020: SUSTAINABLE GROWTH, ENTREPRENEURSHIP, AND ECONOMIC DEVELOPMENT, VOLS 1-4, pp. 1153-1164.
Van, A., Gay, V.C., Kennedy, P.J., Barin, E. & Leijdekkers, P. 2011, 'Understanding risk factors in cardiac rehabilitation patients with random forests and decision trees', Proceedings of the Ninth Australasian Data Mining Conference (AusDM'11), Australian Computer Society, Sydney, pp. 11-22.
Gay, V.C. & Leijdekkers, P. 2011, 'The Good, the Bad and the Ugly About Social Networks for Health Apps', 2011 IFIP 9th International Conference on embedded and Ubiquitous (EUC), IEEE Computing Society, Melbourne Australia, pp. 463-468.
Mobile devices are blending into our lives and change the way we manage our social life but also how we look after our health. Hundreds of health apps are available for mobile devices and many use social network functionalities that allow users to exchange personal experiences and discuss their health with others. This has many positive results but also negative side effects. This paper discusses the good, the bad and the ugly about social network integration with mobile health applications. It is based on a comprehensive review of literature, social networking health forums, surveys, and our own experience with health apps for mobile devices.
Qudah, I., Leijdekkers, P. & Gay, V.C. 2011, 'Proposed Novel Solution to Improve Medication Adherence for Cardiac Patients', 2011 IEEE Jordan Conference on Applied Electrical Engineering and Computing Technologies (AEECT), IEEE Comptuting Society, Jordan Amman, pp. 310-315.
In this paper we describe our approach to improve medication adherence. The issue of medication adherence is widely been studied. The paper discusses the differences between existing technologies/devices used to improve medication adherence and proposes a novel solution that links between technologty and behavious change model to predict and assess people tendency to make a change models to predict and assess people tendency to make a change models to predict and assess people tendency to make a change in their health behaviour towards adhering to their medication regimens. The use of technology in this intervention is aiming at assessing the effectiveness of using technology to motivate subjects and improve their medication adherence ratings.
Gay, V.C., Leijdekkers, P. & Barin, E. 2010, 'Feasibility Trial of a Novel Mobile Cardiac Rehabilitation Application', 12th International Conference on E-Health Networking, Application and Service, IEEE Communications Society, France, pp. 86-92.
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A trial with a cardiac rehabilitation centre is in progress where we test a novel cardiac rehab application using a standard mobile phone and wireless sensors. The goal is to obtain insight how remote monitoring compares to conventional rehabilitation methods in terms of adherence to cardiac rehabilitation programmes. In this trial we seek feedback from patients and health professionals regarding usability and practicability of the software and hardware used and we investigate whether the use of the novel mobile rehabilitation application provides clinically meaningful reassurance to patients during their cardiac rehabilitation. The trial also investigates whether physical and psychological measures improve using the system. This paper describes the mobile cardiac rehabilitation application as well as the setup of the trial.
Qudah, I., Leijdekkers, P. & Gay, V.C. 2010, 'Using Mobile Phones to improve Medication Compliance and Awareness for Cardiac Patients', The 3rd ACM International Conference on PErvasive Technologies Related to Assistive Environment, ACM - Association for Computing Machinery, Samos, Greece, pp. 1-7.
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Improving cardiac patients' medication compliance is a major factor in reducing mortality rate and reducing hospitalization rate. This paper describes a novel medication compliance management system. Its novelty lies in the combination of functionalities that helps the patient to comply with their medication regimen, together with a personal health monitoring system that monitors their health and collects vital signs data using a mobile phone and wirelss bio sensors. The system is designed to collect and analyse medication compliance, side effects and symptom responses and transfers the collected data in real time to a web based system for remote monitoring by caregivers and health professionals. Health professionals can use the system to assess the effect of the medication regimen on their patients' health and adapt it to reduce side effects and maximise the patient's wellbeing.
Gay, V.C. & Leijdekkers, P. 2010, 'Body Sensor networks for Mobile Health Monitoring', 2010 Fourth International Conference on Digital society ICDS 2010, IEEE Computer Society, St Maarten, Netherlands Antilles, pp. 204-209.
Abstract Remote ambulatory monitoring is widely seen as playing a key part in addressing the impending crisis in health care provision. We describe two mobile health solutions, one developed in the Netherlands and one in Australia. In both cases patients biosignals are measured by means of body worn sensors which communicate wirelessly with a handheld device. Alarms and biosignals can be transmitted over wireless communication links to a remote location, and a remote health professional can view the biosignals via a web application. The clinical purposes are similar, however the technological approaches differ in some respects. We compare the two approaches and the experience gained working with a number of different patient groups and clinical specialties during trials in Europe and Australia.
Leijdekkers, P., Gay, V.C. & Barin, E. 2009, 'Trial Results of a Novel Cardiac Rhythm Management System using Smart Phones and wireless ECG Sensors', Proceedings of the 7th International Conf. On Smart homes and health Telematics. ICOST 09, LNCS Springer, berlin Heidelberg NewYork, pp. 32-39.
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This paper discusses the trial results of a personalised Cardiac Rhythm Management (CRM) system using a smart phone (PDA) and a wireless ECG sensor. The system is used in a trial to record and diagnose abnormal cardiac arrhythmias. This novel approach uses standard mobile phones, off-the-shelf ECG sensors and personalised feedback to the patient when compared to a conventional clinical Holter and event monitor systems. The preliminary results are discussed of an ongoing trial conducted with the Royal North Shore Hospital in Sydney Australia. The results indicate the viability of the system for commercial purposes.
Gay, V.C., Leijdekkers, P. & Barin, E. 2009, 'A Mobile Rehabilitation Application for the Remote Monitoring of Cardiac Patients after a Heart Attack or a Coronary Bypass Surgery', Proceedings of the 2nd International Conference on PErvsive Technologies Related to Assistive Environments, ACM International Conference Proceeding Series, New York, USA, pp. 1-7.
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This paper describes a personalised rehabilitation application using a smart phone (PDA) and wireless (bio) sensors. It instructs and motivates patients to follow their exercise programme and keeps track of their progress. It also monitors the relevant biosignals and provides immediate feedback to the patient. Sensors transmit data to the mobile phone where it is analysed locally and the data can also be instantaneously transmitted to a healthcare centre for remote monitoring by a health professional. The rehabilitation application is personalised for each cardiac patient and provides tailored advice (e.g. exercise more, slow down). A trial with a rehabilitation centre is in progress in which we investigate whether the personalised rehabilitation application improves the success of the rehabilitation programme in terms of patient compliance with recommended life style changes (such as increase physical activity or lose weight) and whether use of the system brings peace of mind to cardiac patients.
Brakel, J., Gay, V.C. & Leijdekkers, P. 2009, 'From The Hippocratic Oath To Electronic Data Storage: Ethical Aspects For M-Health Projects In Australia', IADIS International Conference e-Health 2009 - MCCSIS 2009, IADIS Press, New York, pp. 115-122.
This paper discusses the issue of ethics when it comes to trialling m-health applications in a hospital environment in Australia. Our team has developed a personalised health monitoring application for smart phones using wireless biosensors to monitor and instruct patients. This paper discusses some of the Australian guidelines regarding ethical aspects of running technological trials of such mobile health projects on cardiac patients. Ethical issues regarding mobile health projects can be generally divided in two parts. The first one concerns any potential dangers to the patients health. Although testing can also be done on healthy test subjects, the best way to acquire real-life test-data is to perform tests on actual cardiac patients. The second one is the privacy aspect in the doctor-patient relationship as some patients do not want to be identified as having a disease or do not want to have their records kept on file and used in scientific publications. Nevertheless, to show the benefits of this personalized m-health monitoring, a technical trial has to be conducted and research data needs to be published in a verifiable way. This paper gives an introduction into ethical regulations, organizations and issues in Australia. It describes, in detail, the issues involved in conducting technical trials in Australian hospitals. The paper gives several recommendations on how to deal with ethics in personalised m-health monitoring projects
Leijdekkers, P., Gay, V.C., Lawrence, E.M. & Barin, E. 2009, 'A PDA-based software interface for remote vital sign monitoring: initial clinical experience', Europace 2009 Vol 11 (suppl 1) Pg 163, Europace, pp. 163-164.
Jones, V., Gay, V.C., Leijdekkers, P., Rienks, R. & Hermens, H. 2009, 'Personalised mobile services supporting the implementation of clinical guidelines', 4th workshop on Personalisation for e-Health, AIME 2009, Verona, pp. 10-14.
Telemonitoring is emerging as a compelling application of Body Area Networks (BANs). We describe two health BAN systems developed respectively by a European team and an Australian team and discuss some issues encountered relating to formalization of clinical knowledge to support realtime analysis and interpretation of BAN data. Our example application is an evidence-based telemonitoring and teletreatment application for home-based rehabilitation. The application is intended to support implementation of a clinical guideline for cardiac rehabilitation following myocardial infarction. In addition to this the proposal is to establish the patients individual baseline risk profile and, by real-time analysis of BAN data, continually re-assess the current risk level in order to give timely personalised feedback. Static and dynamic risk factors are derived from literature. Many sources express evidence probabilistically, suggesting a requirement for reasoning with uncertainty; elsewhere evidence requires qualitatie reasoning: both familiar modes of reasoning in KBSs. However even at this knowledge acquisition stage some issues arise concerning how best to apply the clinical evidence. Furthermore, in cases where insufficient clinical evidence is currently available, telemonitoring can yield large collections of clinical data with the potential for data mining in order to furnish more statistically powerful and accurate clinical evidence.
Leijdekkers, P. & Gay, V.C. 2008, 'A Selftest to Detect a Heart Attack Using a Mobile Phone and Wearable Sensors', proceedings 21st IEEE International Symposium on Computer-Based Medical Systems, IEEE computer society Conference Publishing Services, Los Alamitos, CA 90720-1314, pp. 93-98.
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Leijdekkers, P. & Gay, V.C. 2008, 'A self-test to detect a heart attack using a mobile phone and wearable sensors', 21st IEEE International Symposium on Computer-Based Medical Systems, CBMS 2008, IEEE, New York, pp. 93-98.
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Leijdekkers, P., Gay, V.C. & Lawrence, E.M. 2007, 'Smart Homecare System for Health Tele-monitoring', Proceedings of First International Conference on the Digital Society (ICDS 2007), IEEE Computer Society, Los Alamitos, CA, USA, pp. 1-5.
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An increasing aged population worldwide puts our medical capabilities to the test. Research and commercial groups are investigating novel ways to care for the aged and chronically ill both in their own homes and in care facilities. This paper describes a prototype we have developed for remote healthcare monitoring. This personalized smart homecare system uses smart phones, wireless sensors, web servers and IP webcams. To illustrate the functionality of the prototype we describe a series of typical tele-health monitoring scenarios
Fokkenrood, S., Leijdekkers, P. & Gay, V.C. 2007, 'Ventricular Tachycardia/Fibrillation Detection Algorithm for 24/7 Personal Wireless Heart Monitoring', Proceeding of ICOST 2007: Pervasive Computing Perspectives for Quality of Life Enhancement, Springer, Heidelberg, Germany, pp. 110-120.
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This paper describes a Ventricular Tachycardia/Fibrillation (VT/VF) detection algorithm that is specifically designed for a 24/7 personal wireless heart monitoring system. This monitoring system uses Bluetooth enabled bio-sensors and smart phones to monitor continuously cardiac patients? vital signs. Our VT/VF algorithm is optimized for continuous real-time monitoring on smart phones with a high sensitivity and specificity. We studied and compared existing VT/VF algorithms and selected the one which suited best our requirements. However, we modified and improved the existing algorithm for the smart phone to achieve better performance results. We tested the algorithm on full-length signals from the physionet CU, MIT-db and MIT-vfdb databases [16] without any pre-selection of VT/VF or normal QRS-complex signals. We achieved 97% sensitivity, 98% accuracy and 98% specificity for our implementation which is excellent compared to existing algorithms.
Duflos, S., Kervalla, B. & Gay, V.C. 2007, 'Considering Security and Quality of Service in SLS to improve Policy-based Management of Multimedia Services', Proceedings of the Sixth International Conference on Networking, IEEE Computer Society, USA, pp. 1-6.
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This paper proposes to improve policy-based management by integrating security parameters into the Service Level Specification (SLS). Integrating those parameters in the QoS part of the Service Level Agreement (SLA) specification is of particular importance for multimedia services requiring security since QoS is negotiated when the multimedia service is deployed. Security mechanisms need to be negotiated at that time when sensible multimedia information is exchanged. In this paper we show that including security parameters in SLA specification improves the negotiation and deployment of security and QoS policies for multimedia services. The parameters this paper proposes to integrate have the advantage to be understandable by end-users and service providers.
Leijdekkers, P. & Gay, V.C. 2006, 'Personal heart monitoring system using smart phones to detect life threatening arrhythmias', 19th IEEE International Symposium On Computer-Based Medical Systems, Proceedings, IEEE Computer Soc, Los Alamitos, USA, pp. 157-164.
This paper discusses a personalized heart monitoring system using smart phones and wireless (bio) sensors. We combine ubiquitous computing with mobile health technology to monitor the wellbeing of high risk cardiac patients. The smart phone analyses in r
Leijdekkers, P. & Gay, V.C. 2006, 'Personal Heart monitoring and rehabilitation system using smart phones', Proceedings of the International Conference on Mobile Business ICMB 2006, IEEE Computer Society, Copenhagen, Denmark, pp. 29-36.
Gay, V.C. & Leijdekkers, P. 2006, 'Around the clock personalized health monitoring using smart phones', Smart homes and beyond - ICOST 2006 4th International conference on smart homes and health telematics, IOS Press, Belfast, UK, pp. 82-89.
Duflos, S., Gay, V.C., Kervella, B. & Horlait, E. 2005, 'Improving the SLA-based management of QoS for secure multimedia services', MANAGEMENT OF MULTIMEDIA NETWORKS AND SERVICES, PROCEEDINGS, SPRINGER-VERLAG BERLIN, pp. 204-215.
Duflos, S., Gay, V.C., Kervalla, B. & Horlait, E. 2005, 'Integration of security parameters in the service level specification to improve QoS management of secure distributed multimedia services', IANA 2005, IEEE, Taipei, Taiwan, pp. 145-148.
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This paper proposes to integrate security parameters into the Service Level Specification (SLS). Integrating those parameters in the QoS part of the Service Level Agreement (SLA) specification is essential in particular for secure multimedia services since the QoS is negotiated when the multimedia service is deployed. Security mechanisms need to be negotiated at that time when sensible multimedia information is exchanged. In this paper we show that including security parameters in the SLA specification improves the negotiation, deployment and use of the secure multimedia service. The parameters this paper proposes to integrate have the advantage to be understandable by both the end-users and service providers.
Lubonski, M.M., Gay, V.C. & Simmonds, A.J. 2005, 'A conceptual architecture for adaptation in remote desktop systems driven by the user perception of multimedia', APCC 2005 Asia-Pacific conference on communicatuions, IEEE, Perth, Australia, pp. 891-895.
Leijdekkers, P. & Gay, V.C. 2005, 'Personalised service and network adaptation for smart devices', APCC 2005 Asia-Pacific Conference on communications, IEEE, Perth, Australia, pp. 867-871.
Lubonski, M.M., Gay, V.C. & Simmonds, A.J. 2005, 'An adaptation architecture to improve user-perceived QoS of multimedia services for enterprise remote desktop protocols', 2005 Next Generation Internet Networks, IEEE, Rome, Italy, pp. 149-156.
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Limitations in the contemporary best effort WAN combined with an increase in demand of the business users for multimedia are the main challenges for remote desktop solutions. Thin client remote desktop protocols are now mature enough to work efficiently over low bandwidth and low quality links for normal office applications. However, they face significant challenges when working with more demanding data flows such as multimedia streams. This paper introduces the server-side component of the architecture for remote desktop environment aiming at improving user perception of the more demanding and network sensitive multimedia applications and services. Our component maps of user-perceived Quality of Service (QoS) onto network-level performance parameters in order to improve overall end-to-end QoS. The set of perception rules defined for each application and type of user triggers the adaptation mechanisms to change the transmission parameters in order to meet end user expectations. The adaptation mechanisms can optimize the usage of the available network resources within a dedicated network link both for different flows within single client connection and for all clients connected to the same server module. The result of such an optimization is a new set of connection parameters adjusted to network state changes and user perception of remote desktop. In the paper we discuss requirements of such QoS control mechanisms and respective adaptation mechanisms, followed by the detailed description of the proposed component architecture.
Hecker, M., Leijdekkers, P. & Gay, V.C. 2004, 'A Testbed for Ubiquitous Computing using Next Generation Mobile Networks', Proceedings of the 12th Collector Workshop on e-commerce Collector 2004, Collector Group, Adelaide, Australia, pp. 1-11.

Journal articles

Gay, V. & Leijdekkers, P. 2014, 'Design of emotion-aware mobile apps for autistic children', Health and Technology, vol. 4, pp. 21-26.
Leijdekkers, P. & Gay, V.C. 2013, 'Mobile apps for chronic disease management: lessons learned from myFitnessCompanion', Health and Technology, vol. 3, no. 0, pp. 111-118.
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Nowadays, many health and fitness applications (apps) can be downloaded from app stores, changing the way people manage their health and chronic diseases. This paper reflects on 7 years of experience in mobile health and fitness app development. It analyzes the uptake of a health and fitness app, myFitnessCompanion, by the healthcare industry and end-users dealing with chronic disease management. The use of myFitnessCompanion is analyzed from an end-user perspective. The app is available via Google Play since February 2011 and the research presented is based on data collected from 5500+ users over a period of 7 months. The paper also discusses how mHealth apps could be distributed in the near future, as well as, the use of Personal Health Record (PHR) systems such as Microsoft HealthVault, and the impact of regulations on the future of mHealth apps. The conclusion highlights the challenges and opportunities for app developers in the mHealth industry
Ahad, M.T., Dyson, L.E. & Gay, V.C. 2012, 'An Empirical Study of Factors Influencing the SME's Intention to Adopt m-Banking in Rural Bangladesh', Journal of Mobile Technologies, Knowledge and Society, vol. 2012, pp. 1-16.
This research empirically studies the factors that influence the intention of SME owners and managers to adopt m-banking in rural Bangladesh. The study specifically focuses on business oriented m-banking, such as paying suppliers or receiving payments from customers, and on person-to-person use of m-banking. Although over the last ten years a wide spectrum of mbanking frameworks has emerged in various countries, very few research have focused on SMEs m-banking adoption and acceptance of the service. Another rationale for undertaking such a study is that m-banking has not yet been extended to rural Bangladesh. To fill the gap this research surveyed 550 SMEs owners/managers in four (4) rural villages. The survey indicates that poor banking facilities, cost, credibility, gender, education and SME business type are the main factors that significantly influence the intention to adopt m-banking. The analysis focuses on the three factors that have been largely overlooked in prior literature, that are banking satisfaction, m-banking advantages for SMEs, and SME business type. The study broadens our understanding of m-banking and provides insights into developing m-banking strategies in Bangladesh. This research will be of potential value in accelerating the development of m-banking in Bangladesh.
Leijdekkers, P. & Gay, V.C. 2012, 'User Adoption of Mobile Apps for Chronic Disease Management: A Case Study based on myFitness Companion', Lecture Notes in Computer Science, vol. 7251, pp. 42-49.
Health and fitness apps for smart phones and tablets are changing the way we look after your health. This paper analyses the usage of such an app called myFitnessCompanion for chronic disease management. The analysis is based on data collected from 5000* users over a period of 7 months. Highlights of the study show that blood glucose, weight and blood pressure are teh main physsiological data being monitored. Americans and Germans are the front-runners in adopting mobile health apps and are willing to pay for it. Most users choose to enter data manually instead of using automated wireless Bluetooth sensors. Users prefer to store the collected data on the phone rather than exporting it to Personal Health Record Systems
Leijdekkers, P., Gay, V.C. & Barin, E. 2009, 'Feasibility study of a non invasive cardiac rhythm management system', International Journal of Assistive Robotics and Systems, vol. 10, no. 4, pp. 5-14.
Gay, V.C. & Leijdekkers, P. 2007, 'A Health Monitoring System Using Smart Phones and Wearable Sensors', International Journal of Assistive Robotics and Mechatronic, vol. 8, no. 2, pp. 29-36.
Duflos, S., Diaz, G., Gay, V.C. & Horlait, E. 2002, 'A Comparative Study Of Policy Specification Languages For Secure Distributed Applications', Management Technologies For E-commerce And E-business Applications, Proceedings, vol. 2506, pp. 157-168.
This paper presents a comparative study of policy specification languages. Our objective is to find policy language or notation that is the most suitable to express the security aspects of distributed applications running on policy-based networks. We fir
Gay, V.C., Duflos, S., Kervalla, B., Diaz, G. & Horlait, E. 2002, 'Policy-based Quality Of Service And Security Management For Multimedia Services On Ip Networks In The RTIPA Project', Lecture Notes In Computer Science 2496 - Management Of Multimedia On The Internet, vol. 2496, pp. 25-35.
This paper summarizes the research work that has been conducted in the context of the RTIPA project on policy-based QoS (Quality of Service) and security management for distributed multimedia services. It presents an architecture allowing the derivation
Kervalla, B. & Gay, V.C. 1997, 'Mhegam - A Multimedia Messaging System', IEEE Multimedia, vol. 4, no. 4, pp. 22-29.
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MHEGAM (MHEG-1 Advanced Mail) is a complete multimedia messaging system for the creation, exchange, and restitution of multimedia messages that express spatial and temporal synchronization among their components. MHEGAM can be based on the standard messa
Gay, V.C. & Leijdekkers, P. 1997, 'Multimedia In The Odp-rm Standard', IEEE Multimedia, vol. 4, no. 1, pp. 68-73.
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Gay, V.C., Leijdekkers, P. & Veld, R. 1995, 'Specification Of Multiparty Audio And Video Interaction Based On The Reference Model Of Open Distributed-processing', Computer Networks And Isdn Systems, vol. 27, no. 8, pp. 1247-1262.
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The Reference Model of Open Distributed Processing (RM-ODP) is an emerging ISO/ITU-T standard. It provides a framework of abstractions based on viewpoints, and it defines five viewpoint languages to model open distributed systems. This paper uses the vie