文档介绍：: .
第一题：
The proposed IoT architecture from a technical perspective is shown in Fig. 1. It is divided into three layers. The basic layer and their functionalities are summarized as follows:
Perception layer: its main function is to identify objects and gather information. It is formed mainly by sensors and actuators, monitoring stations (such as cellphone, tablet PC, smart phone, PDA, etc.), nano-nodes, RFID tags and readers/ writers. Network layer: it consists of a converged network made up of
wired/wireless privately owned networks, Internet, network administration systems, etc. Its main function is to transmit information obtained from the perception layer.
Application layer: it is a set of intelligent solutions that apply the IoT technology to satisfy the needs of the users.
. Perception layer
This layer provides context-aware information concerning the environment of disabled people. The components of this layer according to the disability of the person (visually impaired, hearing impaired or physically impaired) are described next.
The components designed for the visually impaired are:(1) body micro-and nano-sensors and (2) RFID-based assistive devices. Next, those components are introduced.
(2001), a retinal prosthesis is developed to restore some vision to patients affected by retinitis pigmentosa and age-related macular degeneration, two diseases that cause degenerative blindness. Although these disorders are characterized by the progressive loss of photoreceptor (rod and cone)cells of the outer retina, they do not affect the inner retinal ganglion nerve cells which form the optic nerve(Ye etal.,2010). Consequently, a camera mounted on a pair of glasses can be used to transmit image data to an implant attached to the retina, which is formed by an array of body micro-sensors. This artificial retina (Schwiebert et al., 2001) uses electrical impulses to stimulate the appropriate gang