The Internet of things is an important part of the new generation of accounting information technology, qcm6125 and its English name is "The Internet of Things", referred to as IOT.
There is no unified definition of the Internet of Things to date, and the generally accepted definition is: The Internet of Things refers to a network that connects any item to the Internet through various information sensing devices installed on the object, such as RFID devices, infrared sensors, global positioning system, laser scanners, etc., according to the agreed protocol, for information exchange and communication, so as to realize the intelligent identification, positioning, tracking, monitoring and management of the item. Many people have their own understanding of the Internet of Things, some people think that the interconnection of RFID is the Internet of things, some people think that the sensor network is the Internet of things, some people think that M2M (Machine to Machine) is the Internet of things, and some people think that the Internet of Things is the extension of the Internet client to any item between items. The essence of the Internet of Things is "the Internet of things connected." The core and foundation of the Internet of Things is still the Internet, which is an extension and expansion of the network on the basis of the Internet, and its users extend and expand to any item between items for information exchange and communication. Comprehensive perception, reliable transmission, and intelligent processing are the main characteristics of the Internet of Things.
Architecture of the Internet of Things
The value of the Internet of Things is to let objects have "wisdom", qualcomm qcm6490 so as to realize the communication between people and things, things and things. The Internet of Things is characterized by the superposition of perception, interconnection and intelligence. Therefore, the Internet of Things consists of three parts: the perception part, mainly based on RFID and sensors to achieve the identification of "things"; Transmission network, that is, data transmission through the existing Internet, broadcast television network, communication network, etc.; Intelligent processing, that is, the use of cloud computing, data mining, middleware and other technologies to achieve automatic control and intelligent management of items.
The current iot architecture in the industry is also universally recognized at these three levels. The bottom layer is the data perception layer, the second layer is the network layer of data transmission, and the top layer is the content application layer.
Perceptual layer
The perception layer mainly realizes comprehensive perception, that is, through sensors and data acquisition devices embedded in objects and facilities, various information and data of the material world can be obtained anytime and anywhere, and access the network. The devices of the sensing layer mainly include sensors, RFID, multimedia information acquisition, GPS, infrared and other devices. A sensor is a device or device that can sense the measured signal and convert it into a usable output signal according to a certain law. RFID is a non-contact automatic identification technology that automatically identifies target objects and obtains relevant data through radio frequency signals.
Network layer
The network layer realizes the bidirectional transmission and control of Internet of Things data information to achieve the purpose of reliable transmission. The network layer must have the ability to process complex events and data flows, provide services including data summary, geographic environment information, identification and association, have the ability to model data and integrate learning, specify an interoperable information technology framework, have the ability to integrate processes, expand the original system, optimize business processes, so as to achieve a more comprehensive interconnection. At present, the communication network technology used to support person-to-person communication is mainly telecommunications network, but there are differences in the requirements and characteristics of object-to-object communication and person-to-person communication. In order to make the network more adaptable to object-to-object communication, the existing network needs to be enhanced or optimized. The virtualization technology is used to mask the differences in resource forms and resource usage management modes of heterogeneous networks. Network resources, such as devices, storage devices, computing devices, and carriers, are perceived, collected, and abstracted.
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