A review of smart homes - Present state and future challenges

In the era of information technology, the elderly and disabled can be monitored with numerous intelligent devices. Sensors can be implanted into their home for continuous mobility assistance and non-obtrusive disease prevention. Modern sensor-embedded houses, or smart houses, cannot only assist people with reduced physical functions but help resolve the social isolation they face. They are capable of providing assistance without limiting or disturbing the resident's daily routine, giving him or her greater comfort, pleasure, and well-being. This article presents an international selection of leading smart home projects, as well as the associated technologies of wearable/implantable monitoring systems and assistive robotics. The latter are often designed as components of the larger smart home environment. The paper will conclude by discussing future challenges of the domain.

[1]  Takanori Shibata,et al.  Emergence of Affective Behaviors through Physical Interaction between Human and Mental Commit Robot , 2001, J. Robotics Mechatronics.

[2]  A Allen,et al.  Patient satisfaction with telemedicine in a rural clinic. , 1994, American journal of public health.

[3]  O. Diegel,et al.  Intelligent Automated Health Systems for Compliance Monitoring , 2005, TENCON 2005 - 2005 IEEE Region 10 Conference.

[4]  A Allen,et al.  A joint US–UK study of home telenursing , 1998, Journal of telemedicine and telecare.

[5]  Joelle Pineau,et al.  Experiences with a mobile robotic guide for the elderly , 2002, AAAI/IAAI.

[6]  Benedict Stanberry,et al.  Legal ethical and risk issues in telemedicine , 2001, Comput. Methods Programs Biomed..

[7]  Suk Lee,et al.  Development of PIR sensor based indoor location detection system for smart home , 2006 .

[8]  K. Bauer,et al.  The ethical and social dimensions of home-based telemedicine. , 2000, Critical reviews in biomedical engineering.

[9]  David Bell,et al.  DESIGN CRITERIA FOR OBSTACLE AVOIDANCE IN A SHARED-CONTROL SYSTEM , 1994 .

[10]  George Demiris,et al.  Telehomecare: quality, perception, satisfaction. , 2004, Telemedicine journal and e-health : the official journal of the American Telemedicine Association.

[11]  William C. Mann,et al.  Enabling location-aware pervasive computing applications for the elderly , 2003, Proceedings of the First IEEE International Conference on Pervasive Computing and Communications, 2003. (PerCom 2003)..

[12]  H Mizushima,et al.  Telemedicine comes of age. , 2000, Japanese journal of clinical oncology.

[13]  Darwin G. Caldwell,et al.  Telepresence feedback and input systems for a twin armed mobile robot , 1996, IEEE Robotics Autom. Mag..

[14]  Thomas L. Harrington,et al.  Gerontechnology Why and How , 2000 .

[15]  Svetha Venkatesh,et al.  A probabilistic approach to the anxious home for activity monitoring , 2005, 29th Annual International Computer Software and Applications Conference (COMPSAC'05).

[16]  H Wakaumi,et al.  Development of an automated wheelchair guided by a magnetic ferrite marker lane. , 1992, Journal of rehabilitation research and development.

[17]  Kent Larson,et al.  Activity Recognition in the Home Using Simple and Ubiquitous Sensors , 2004, Pervasive.

[18]  Stephen S. Intille,et al.  Designing a Home of the Future , 2002, IEEE Pervasive Comput..

[19]  Tetsuo Ono,et al.  Development and evaluation of an interactive humanoid robot "Robovie" , 2002, Proceedings 2002 IEEE International Conference on Robotics and Automation (Cat. No.02CH37292).

[20]  Branko G. Celler,et al.  An instrumentation system for the remote monitoring of changes in functional health status of the elderly at home , 1994, Proceedings of 16th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[21]  David J. Reinkensmeyer,et al.  Robotic assist devices for bimanual physical therapy: preliminary experiments , 1993 .

[22]  Paolo Dario,et al.  MOVAID: a personal robot in everyday life of disabled and elderly people , 1999 .

[23]  R. Hintsche,et al.  Novel micromachined silicon sensor for continuous glucose monitoring. , 2005, Biosensors & bioelectronics.

[24]  Swamy Laxminarayan,et al.  UNWIRED E-MED: the next generation of wireless and internet telemedicine systems , 2000, IEEE Transactions on Information Technology in Biomedicine.

[25]  Sherrilynne S Fuller,et al.  Low-bandwidth, low-cost telemedicine consultations in rural family practice. , 2002, The Journal of the American Board of Family Practice.

[26]  C Sable Telecardiology: Potential impact on acute care , 2001, Critical care medicine.

[27]  Hyong-Euk Lee,et al.  Development of a steward robot for human-friendly interaction , 2006, 2006 IEEE Conference on Computer Aided Control System Design, 2006 IEEE International Conference on Control Applications, 2006 IEEE International Symposium on Intelligent Control.

[28]  A. Uchiyama Endoradiosonde needs micro machine technology , 1995, MHS'95. Proceedings of the Sixth International Symposium on Micro Machine and Human Science.

[29]  Seung Hee Ho,et al.  Patient satisfaction with telemedicine in home health services for the elderly , 2001, Int. J. Medical Informatics.

[30]  Dietmar Loy,et al.  Open control networks: LonWorks/EIA 709 technology , 2001 .

[31]  Shoji Kurakake,et al.  Ubiquitous sensors based human behavior modeling and recognition using a spatio-temporal representation of user states , 2004, 18th International Conference on Advanced Information Networking and Applications, 2004. AINA 2004..

[32]  R O Potts,et al.  Clinical evaluation of the GlucoWatch biographer: a continual, non-invasive glucose monitor for patients with diabetes. , 2001, Biosensors & bioelectronics.

[33]  A. Yamaguchi,et al.  Monitoring behavior in the home using positioning sensors , 1998, Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286).

[34]  B Comet,et al.  Telemonitoring of vital parameters with newly designed biomedical clothing. , 2004, Studies in health technology and informatics.

[35]  R. Scott,et al.  The socio-economic impact of telehealth: A systematic review , 2003, Journal of telemedicine and telecare.

[36]  María Teresa Arredondo,et al.  Multimedia telehomecare system using standard TV set , 2002, IEEE Transactions on Biomedical Engineering.

[37]  P.D. Nisbet Who's intelligent? Wheelchair, driver or both? , 2002, Proceedings of the International Conference on Control Applications.

[38]  K. Kario,et al.  Ambulatory blood pressure monitoring for cardiovascular medicine , 2003, IEEE Engineering in Medicine and Biology Magazine.

[39]  N. M. Barnes,et al.  Lifestyle monitoring-technology for supported independence , 1998 .

[40]  Vijay Kumar,et al.  Design of a Walking Wheelchair for the Motor Disabled , 1994 .

[41]  B Allen An integrated approach to Smart House technology for people with disabilities. , 1996, Medical engineering & physics.

[42]  P. Whitten,et al.  Systematic review of studies of patient satisfaction with telemedicine , 2000, BMJ : British Medical Journal.

[43]  A Allen,et al.  An analysis of the suitability of home health visits for telemedicine , 1999, Journal of telemedicine and telecare.

[44]  C. Coulon,et al.  Télésurveillance en hémodialyse. Étude préliminaire , 1999 .

[45]  Barry Brumitt,et al.  EasyLiving: Technologies for Intelligent Environments , 2000, HUC.

[46]  B. Johnston,et al.  Outcomes of the Kaiser Permanente Tele-Home Health Research Project. , 2000, Archives of family medicine.

[47]  R.A. Brooks,et al.  The Intelligent Room project , 1997, Proceedings Second International Conference on Cognitive Technology Humanizing the Information Age.

[48]  S. Brownsell,et al.  An attributable cost model for a telecare system using advanced community alarms , 2001, Journal of telemedicine and telecare.

[49]  T. Tuomisto,et al.  Diurnal and weekly rhythms of health-related variables in home recordings for two months , 2006, Physiology & Behavior.

[50]  P. S. Fisher,et al.  Voice Controlled Smart House , 1993, IEEE 1993 International Conference on Consumer Electronics Digest of Technical Papers.

[51]  George Demiris,et al.  Electronic home healthcare: concepts and challenges , 2004, Int. J. Electron. Heal..

[52]  Jean Pierre Thomesse,et al.  A review of the fieldbuses , 1998 .

[53]  Madeleine Donahue Regulating telehealth in Ontario--next step in the transformation agenda. , 2006, Health law in Canada.

[54]  M. Pavel,et al.  Unobtrusive monitoring of sleep patterns , 2003, Proceedings of the 25th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (IEEE Cat. No.03CH37439).

[55]  P Nisbet Integrating assistive technologies: current practices and future possibilities. , 1996, Medical engineering & physics.

[56]  H Harry Asada,et al.  Mobile monitoring with wearable photoplethysmographic biosensors. , 2003, IEEE engineering in medicine and biology magazine : the quarterly magazine of the Engineering in Medicine & Biology Society.

[57]  Kenji Mase,et al.  Activity and Location Recognition Using Wearable Sensors , 2002, IEEE Pervasive Comput..

[58]  H. B. Stauffer Smart enabling system for home automation , 1991 .

[59]  M. Tsuji Innovation and technological management of the Japanese e-health and telehealth industries , 2004, 2004 IEEE International Engineering Management Conference (IEEE Cat. No.04CH37574).

[60]  Spyros G. Tzafestas,et al.  The autonomous mobile robot SENARIO: a sensor aided intelligent navigation system for powered wheelchairs , 1997, IEEE Robotics Autom. Mag..

[61]  G. Eysenbach What is e-health? , 2001, Journal of Medical Internet Research.

[62]  B. Betts,et al.  Smart Sensors , 2006, IEEE Spectrum.

[63]  M. Topping,et al.  Dynamically responsive intervention for tremor suppression , 2003, IEEE Engineering in Medicine and Biology Magazine.

[64]  Sabine Koch,et al.  Home telehealth - Current state and future trends , 2006, Int. J. Medical Informatics.

[65]  Paolo Dario,et al.  An implantable telemetry platform system for in vivo monitoring of physiological parameters , 2004, IEEE Transactions on Information Technology in Biomedicine.

[66]  Michael C. Mozer,et al.  The Neural Network House: An Environment that Adapts to its Inhabitants , 1998 .

[67]  S. Venkatesh,et al.  Spatial Activity Recognition in a Smart Home Environment using a Chemotactic Model , 2005, 2005 International Conference on Intelligent Sensors, Sensor Networks and Information Processing.

[68]  Paul Lukowicz,et al.  AMON: a wearable multiparameter medical monitoring and alert system , 2004, IEEE Transactions on Information Technology in Biomedicine.

[69]  D. Hailey,et al.  Systematic review of evidence for the benefits of telemedicine , 2002, Journal of telemedicine and telecare.

[70]  K. Watanabe,et al.  Network health monitoring system in the sleep , 2004, SICE 2004 Annual Conference.

[71]  Jacques Demongeot,et al.  A system for automatic measurement of circadian activity deviations in telemedicine , 2002, IEEE Transactions on Biomedical Engineering.

[72]  Jianchu Yao,et al.  A wearable point-of-care system for home use that incorporates plug-and-play and wireless standards , 2005, IEEE Transactions on Information Technology in Biomedicine.

[73]  M. Chan,et al.  Assessment of activity of elderly people using a home monitoring system , 2005, International journal of rehabilitation research. Internationale Zeitschrift fur Rehabilitationsforschung. Revue internationale de recherches de readaptation.

[74]  Shuichi Shoji,et al.  A very low-power consumption wireless ECG monitoring system using body as a signal transmission medium , 1997, Proceedings of International Solid State Sensors and Actuators Conference (Transducers '97).

[75]  Ahmad Risk,et al.  e-Health Ethics Draft Code (Feb 18) , 2000, Journal of medical Internet research.

[76]  Pamela Whitten,et al.  Evolution of telemedicine from an applied communication perspective in the United States. , 2006, Telemedicine journal and e-health : the official journal of the American Telemedicine Association.

[77]  M. Makikawa,et al.  Development of an ambulatory physical activity and behavior map monitoring system , 1996, Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[78]  Tatsuya Yamazaki,et al.  Beyond the Smart Home , 2006, 2006 International Conference on Hybrid Information Technology.

[79]  Louis Lareng [Origins of French telemedicine legislation]. , 2006, Bulletin de l'Academie nationale de medecine.

[80]  Sungmee Park,et al.  Enhancing the quality of life through wearable technology , 2003, IEEE Engineering in Medicine and Biology Magazine.

[81]  P. Castiglioni,et al.  MagIC System: a New Textile-Based Wearable Device for Biological Signal Monitoring. Applicability in Daily Life and Clinical Setting , 2005, 2005 IEEE Engineering in Medicine and Biology 27th Annual Conference.

[82]  M. Chambers,et al.  User-friendly technology to help family carers cope. , 2002, Journal of advanced nursing.

[83]  Mikael Collan,et al.  IT and institutional constraints: effects of legal and administrative constraints to use it in production of health care services - focus on Finland , 2003, 36th Annual Hawaii International Conference on System Sciences, 2003. Proceedings of the.

[84]  I. Korhonen,et al.  TERVA: wellness monitoring system , 1998, Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286).

[85]  Stuart M. Speedie,et al.  Patient satisfaction with TeleHomeCare , 2002, Proceedings of the Second Joint 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society] [Engineering in Medicine and Biology.

[86]  Takashi Suehiro,et al.  Sensorized environment for self-communication based on observation of daily human behavior , 2000, Proceedings. 2000 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2000) (Cat. No.00CH37113).

[87]  N H Lovell,et al.  The potential impact of home telecare on clinical practice , 1999, The Medical journal of Australia.

[88]  Roger Orpwood,et al.  The installation and support of internationally distributed equipment for people with dementia , 2004, IEEE Transactions on Information Technology in Biomedicine.

[89]  G. Williams,et al.  A systems approach to achieving CarerNet-an integrated and intelligent telecare system , 1998, IEEE Transactions on Information Technology in Biomedicine.

[90]  Masatsugu Tsuji,et al.  On the evaluation of economic benefits of Japanese telemedicine and factors for its promotion. , 2006, Telemedicine journal and e-health : the official journal of the American Telemedicine Association.

[91]  M Chan,et al.  Alarm communication network to help carers of the elderly for safety purposes: a survey of a project. , 1999, International journal of rehabilitation research. Internationale Zeitschrift fur Rehabilitationsforschung. Revue internationale de recherches de readaptation.

[92]  C Vermeulen,et al.  A model house as platform for information exchange on housing. , 1998, Studies in health technology and informatics.

[93]  M. Moy,et al.  Ambulatory monitoring of cumulative free-living activity , 2003, IEEE Engineering in Medicine and Biology Magazine.

[94]  Mark Perry,et al.  Multimodal and ubiquitous computing systems: supporting independent-living older users , 2004, IEEE Transactions on Information Technology in Biomedicine.

[95]  Jong-Tae Lim,et al.  Robotic smart house to assist people with movement disabilities , 2007, Auton. Robots.

[96]  Emil Jovanov,et al.  Stress monitoring using a distributed wireless intelligent sensor system. , 2003, IEEE engineering in medicine and biology magazine : the quarterly magazine of the Engineering in Medicine & Biology Society.

[97]  E. Waterhouse,et al.  New horizons in ambulatory electroencephalography , 2003, IEEE Engineering in Medicine and Biology Magazine.

[98]  H L Daly,et al.  Telemedicine: the invisible legal barriers to the health care of the future. , 2000, Annals of health law.

[99]  Louis Lareng La genèse de la loi sur la télémédecine , 2006 .

[100]  T. Sato,et al.  Environment-type robot system "RoboticRoom" featured by behavior media, behavior contents, and behavior adaptation , 2004, IEEE/ASME Transactions on Mechatronics.

[101]  Takanori Shibata,et al.  Subjective interpretation of emotional behavior through physical interaction between human and robot , 1999, IEEE SMC'99 Conference Proceedings. 1999 IEEE International Conference on Systems, Man, and Cybernetics (Cat. No.99CH37028).

[102]  P Guerette,et al.  Integrating control of multiple assistive devices: a retrospective review. , 1994, Assistive technology : the official journal of RESNA.

[103]  Črt Marinček Assistive technology - added value to the quality of life : AAATE'01 , 2001 .

[104]  A. Risk,et al.  e-Health Code of Ethics (May 24) , 2000, Journal of medical Internet research.

[105]  Jacques Demongeot,et al.  A model for the measurement of patient activity in a hospital suite , 2006, IEEE Transactions on Information Technology in Biomedicine.

[106]  Paolo Dario,et al.  Experiments in synthetic psychology for tactile perception in robots: steps towards implementing humanoid robots , 1998, Proceedings. 1998 IEEE International Conference on Robotics and Automation (Cat. No.98CH36146).

[107]  B. Dickens,et al.  Legal and ethical issues in telemedicine and robotics , 2006, International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics.

[108]  Claude Marsault,et al.  [The TELIF network of Paris-area public hospitals (AP-HP)]. , 2006, Bulletin de l'Academie nationale de medecine.

[109]  T. Tamura,et al.  Fully automated health monitoring system in the home , 1998 .

[110]  Henrik Schiøler,et al.  Proceedings of the 2006 IEEE International Conference on Control Applications , 2006 .

[111]  Y. Higashi,et al.  An unconstrained monitoring system for home rehabilitation , 2005, IEEE Engineering in Medicine and Biology Magazine.

[112]  Hiroshi Noguchi,et al.  Construction of network system and the first step of summarization for human daily action data in the sensing room , 2002, Proceedings. IEEE Workshop on Knowledge Media Networking.

[113]  George Demiris,et al.  Ethical Considerations for the Utilization of Telehealth Technologies in Home and Hospice Care by the Nursing Profession , 2006, Nursing administration quarterly.

[114]  Alireza Ahmadian,et al.  A framework for progressive medical image transmission and compression , 2002, Proceedings of the Second Joint 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society] [Engineering in Medicine and Biology.

[115]  Luis G. Kun Telehealth and the global health network in the 21st century. From homecare to public health informatics , 2001, Comput. Methods Programs Biomed..

[116]  P. Connolly,et al.  Opportunities at the skin interface for continuous patient monitoring: a reverse iontophoresis model tested on lactate and glucose. , 2002, IEEE transactions on nanobioscience.

[117]  Srinivas Katar,et al.  A power line communication network infrastructure for the smart home , 2002, IEEE Wirel. Commun..

[118]  Pendrak Rf,et al.  Telemedicine and the law. , 1996 .

[119]  Diane J. Cook,et al.  The role of prediction algorithms in the MavHome smart home architecture , 2002, IEEE Wirel. Commun..

[120]  Tinghuai Ma,et al.  Context-aware implementation based on CBR for smart home , 2005, WiMob'2005), IEEE International Conference on Wireless And Mobile Computing, Networking And Communications, 2005..

[121]  Han-Pang Huang,et al.  Development of a wearable biomedical health-care system , 2005, 2005 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[122]  Fabrice Axisa,et al.  Flexible technologies and smart clothing for citizen medicine, home healthcare, and disease prevention , 2005, IEEE Transactions on Information Technology in Biomedicine.

[123]  J Sixsmith,et al.  Smart care technologies: meeting whose needs? , 2000, Journal of telemedicine and telecare.

[124]  Katarzyna Wac,et al.  Wireless body area networks for healthcare: the MobiHealth project. , 2004, Studies in health technology and informatics.

[125]  M. Skubic,et al.  A technology and nursing collaboration to help older adults age in place. , 2005, Nursing outlook.

[126]  Sajal K. Das,et al.  LeZi-update: an information-theoretic approach to track mobile users in PCS networks , 1999, MobiCom.

[127]  Darwin G. Caldwell,et al.  A new perspective on the intelligent home , 1996 .

[128]  William C. Mann,et al.  The Gator Tech Smart House: a programmable pervasive space , 2005, Computer.

[129]  Bryan Horling,et al.  The Intelligent Home Testbed , 2004 .

[130]  M. Cooper,et al.  Implications of the emerging home systems technologies for rehabilitation. , 1996, Medical engineering & physics.

[131]  K. Najafi,et al.  A single-channel implantable microstimulator for functional neuromuscular stimulation , 1997, IEEE Transactions on Biomedical Engineering.

[132]  K. Bauer,et al.  Home-Based Telemedicine: A Survey of Ethical Issues , 2001, Cambridge Quarterly of Healthcare Ethics.

[133]  M. Bailey-Van Kuren,et al.  Mechatronic applications in pediatric therapy devices , 2005, Proceedings, 2005 IEEE/ASME International Conference on Advanced Intelligent Mechatronics..

[134]  M. Shults,et al.  A telemetry-instrumentation system for monitoring multiple subcutaneously implanted glucose sensors , 1994, IEEE Transactions on Biomedical Engineering.

[135]  Daniel Estève,et al.  Validation of a remote monitoring system for the elderly: application to mobility measurements. , 2002, Technology and health care : official journal of the European Society for Engineering and Medicine.

[136]  John Pickup,et al.  In vivo glucose sensing for diabetes management: progress towards non-invasive monitoring , 1999, BMJ.

[137]  F. Taoka,et al.  An economic evaluation of the Japanese telehealth system by CVM: comparison of four regions , 2003, Proceedings 5th International Workshop on Enterprise Networking and Computing in Healthcare Industry (HealthCom).

[138]  S. Lorente Key issues regarding Domotic applications , 2004, Proceedings. 2004 International Conference on Information and Communication Technologies: From Theory to Applications, 2004..

[139]  K. Bowles,et al.  Cost analysis of telehomecare. , 2001, Telemedicine journal and e-health : the official journal of the American Telemedicine Association.

[140]  Jyrki Lötjönen,et al.  Automatic sleep-wake and nap analysis with a new wrist worn online activity monitoring device vivago WristCare. , 2003, Sleep.

[141]  M S Hawley,et al.  Providing rehabilitation integrated systems using existing rehabilitation technology. , 1996, Medical engineering & physics.

[142]  Gregory D. Abowd,et al.  The Aware Home: A Living Laboratory for Ubiquitous Computing Research , 1999, CoBuild.

[143]  Deon Reynders,et al.  Practical Industrial Data Networks: Design, Installation and Troubleshooting , 2004 .

[144]  Alex Mihailidis,et al.  The use of computer vision in an intelligent environment to support aging-in-place, safety, and independence in the home , 2004, IEEE Transactions on Information Technology in Biomedicine.

[145]  Ilkka Korhonen,et al.  Health monitoring in the home of the future. , 2003, IEEE engineering in medicine and biology magazine : the quarterly magazine of the Engineering in Medicine & Biology Society.

[146]  Keri J. Heilman,et al.  Accuracy of the LifeShirt® (Vivometrics) in the detection of cardiac rhythms , 2007, Biological Psychology.

[147]  R. Merrell,et al.  Telemedicine licensure in the United States: the need for a cooperative regional approach. , 2007, Telemedicine journal and e-health : the official journal of the American Telemedicine Association.

[148]  Jacques Bazex [Teledermatology in Midi-Pyrenees]. , 2006, Bulletin de l'Academie nationale de medecine.

[149]  A. Bynum,et al.  The impact of telemedicine on patients' cost savings: some preliminary findings. , 2003, Telemedicine journal and e-health : the official journal of the American Telemedicine Association.

[150]  David G. Stork,et al.  Pattern Classification , 1973 .

[151]  E. D. Ilsar,et al.  Remote monitoring of health status of the elderly at home. A multidisciplinary project on aging at the University of New South Wales. , 1995, International journal of bio-medical computing.

[152]  J. Krumm,et al.  Multi-camera multi-person tracking for EasyLiving , 2000, Proceedings Third IEEE International Workshop on Visual Surveillance.

[153]  Mary Moore,et al.  The evolution of telemedicine , 1999, Future Gener. Comput. Syst..

[154]  E. Campo,et al.  Smart house automation system for the elderly and the disabled , 1995, 1995 IEEE International Conference on Systems, Man and Cybernetics. Intelligent Systems for the 21st Century.

[155]  P. Tang,et al.  'Smart' homes and telecare for independent living , 2000, Journal of telemedicine and telecare.