Tham khảo tài liệu 'smart home systems part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 6 Smart Home Systems Another type of application which will be called instanciable or simply application runs for a delimited period in time. These applications have the particularity of being started and then stopped. For example an application is activated at the time the user leaves the house. This application consists of managing the security while minimizing the energy consumed by the house. The application will turn off all the lights in the house close all shutters lower the heating connect the alarm system. When the user comes back home the application is stopped and disconnected the alarm system is turned off and according to the circumstances it may reopen the shutters or turn on the lights. The last type of application is called daemon. This type of application is started and then runs continuously. For example an application for the surveillance of patients in their home will collect medical data about the patient and then send daily reports to the doctor. Such applications are executed and never stopped. Challenges This domain of computing encompasses a large number of applications particularly useful to help people in their daily life. The main challenge of pervasive computing is to provide a coherent pervasive environment providing useful services and applications involving a set of heterogeneous distributed and dynamic equipments and software communicating across different protocols. In this context several characteristics specific to the field of pervasive computing makes this area attractive in terms of industry and users while raising difficult scientific problems for the development and management of these systems. Distribution. The devices are an integral part of the environment. They are scattered in the physical environment and are accessible through different protocols that can use cable or wireless technologies. Applications using the capabilities of such equipment do not necessarily run on the considered equipments and are therefore .
