Friday, April 3, 2015

Wireless sensor networks become a research hotspot

Wireless sensor networks are one of the hot current research in the field of information can be used to achieve specific environmental signal acquisition, processing and sending. Wireless sensor network is a new information acquisition and processing technology, has been widely applied in real life.

Sensor nodes can continuously collect data, event detection, event flags, position monitoring and control node. These features and wireless connectivity makes the prospect of sensor nodes for wireless sensor networks is very broad, can be widely used in environmental monitoring and forecasting, health care, smart home, building condition monitoring, complex machinery monitoring, urban transportation, space exploration, large workshop and warehouse management, as well as airports, large industrial park safety monitoring. With the in-depth research and extensive application of wireless sensor networks, wireless sensor networks gradually penetrated into all areas of human life and the attention of the industry.

Guarantee safe and smooth in the Intelligent Transportation System

Intelligent Transportation Systems (ITS) is a new transport system developed on the basis of the traditional transportation system, it information, communication, control and computer technology and other modern communications technology integration for the transport sector, and "people - vehicle - road - Environment "together organically. A wireless sensor network technology to increase the existing transportation facilities, will be able to alleviate the problems of modern safe, smooth, energy and environmental issues such as transportation from the fundamental, but also can improve traffic efficiency. Therefore, the wireless sensor network technology used in intelligent transportation system has become a hot topic in recent years. Intelligent Transportation Systems include several aspects of traffic information collection, traffic information transmission, such as traffic control and induction. Wireless sensor networks can provide an effective means for information collection and transmission of intelligent transportation systems, to monitor road and traffic intersection in each direction, speed and other information. It mainly consists of information gathering input subsystem policy control, output execution, data transfer between the various subsystems and communications. Information collected by the sensor acquisition subsystem vehicles and road information, and then by the policy control subsystem based on goal-setting, and the use of calculation methods to calculate the best solution, while the output control signals to the execution subsystem, to guide and control the vehicle passage, so as to achieve a preset target. Wireless sensor networks in Intelligent Transportation can also be used for traffic information dissemination, technical field of electronic toll, speed measurement, parking management, integrated information service platform, intelligent transportation and rail transportation, traffic guidance systems and integrated information platform.

In the health care system has much to offer

In recent years, wireless sensor networks have many applications in the health care system and health care, for example, to monitor the body's various physiological data, track and monitor the patient's physician and hospital operations, as well as the hospital's medication management. If the patient who install special purpose sensor nodes, such as heart rate and blood pressure monitoring equipment, the doctor can always be monitoring the patient's understanding of the disease, when the abnormal situation can quickly rescue. A University of Rochester study suggests that these computers can even be used for medical research. Scientists use a wireless sensor creates a "smart medical home" that a five room apartment, where the use of human research project to test the concept and prototype products. "Smart medical home" Use dust to measure important characteristics of the occupants (blood pressure, pulse and respiration), sleeping posture and activity status 24 hours a day. The data collected will be used to carry out future medical research. By embedding network sensors in shoes, furniture and household appliances and other equipment that can help the elderly, seriously ill patients and families living with disabilities. Efficient use of sensor networks can deliver the necessary information in order to facilitate the acceptance of care, but also reduce the burden on caregivers and improve quality of care. Prolonged use of sensor networks to collect physiological data, you can speed up the process of the development of new drugs, and the installation caused much inconvenience in the body of the object being monitored miniature sensors will not give normal life. In addition, medication management and other aspects, it also has a new and unique applications.

Facilitate more intelligent information appliances

The increasing popularity of wireless sensor networks, and promote the information appliance, the rapid development of network technology, the main devices in the home network from a single machine to a variety of appliances expanded home-based intelligent network control nodes for wireless sensor networks within the family, the external network The connection between the internal network and connecting information appliances and equipment provides a foundation platform.

Sensor nodes embedded in home appliances, connected together via a wireless network and the Internet, will provide people with a more comfortable, convenient and more humane smart home environment. The use of remote monitoring system enables remote control of home appliances, home security can always monitor the situation through the image sensing device. The use of intelligent sensor networks can be established kindergarten, early education monitoring environments for children, as well as tracking the trajectory of children's activities.

Wireless sensor networks using the existing Internet, mobile communication network and the telephone network indoor environmental parameters, operating status and other information appliances to inform tenants that residents can keep abreast of the situation inside the home, and appliances for remote monitoring, home interior and outside information transfer. Wireless sensor networks enable tenants not only anywhere you can access through a browser to monitor home water, electricity meters, gas meters, electric water heaters, air conditioners, rice cookers and security systems, gas leak alarm system, outsider intrusion warning system, and command can be set through a browser, remote control for home appliances. Wireless sensor network consists of more than one function the same or different wireless sensor nodes, to a monitoring device to form a wireless sensor network to access the Internet through a gateway system that uses a hybrid star star structure based on wireless sensor network structure of the system model. Sensor node in the network is responsible for data acquisition and data transfer node data acquisition, data acquisition module indoor environment, such as temperature, humidity, etc., by the communication routing protocol directly or indirectly transfer the data to the remote gateway node.

Currently, the main researches wireless sensor network node low power hardware platform design and topology control, network protocols, positioning technology. To detect light intensity sensor, for example, implement a wireless sensor network, according to the intensity of light detected by the sensor to turn off or turn on lights. In wireless sensor networks, ordinary node that collects the light intensity data is sent to the network coordinator, the network coordinator will contain data frame is sent to the control variable nodes simultaneously with the lights, but also the light intensity through the serial data transfer to the computer. By installing the software on a computer background, you can see the changes in light intensity signal. By covering the light intensity sensor may change the intensity of the collected light data, when the light intensity is relatively low when the curve decreased, whereas curve rises. This combination of embedded sensor network technology, sensor technology, short-range wireless communications technology, has a wide range of applications. The system does not require changes to the structure of the site, without the original support any fixed network, capable of rapid deployment, easy to adjust, and has good maintainability and scalability.

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