1. Wearable computers and wearable wireless networks
1.1 The wearable computer is a new concept of mobile computing systems. Its concept originated in the 1960s. Since the 1990s, with the rapid development of large-scale and very large-scale integrated circuits, research on wearable computers has entered a new stage. Currently, there is no exact definition of the concept of a wearable computer. In general, wearable computers should have the following basic characteristics: they can be used in motion; they can be used to free up hands or other things; users can control; sustainable, diverse, ie different applications The wearable computer should be different in composition, function, etc., as can be seen from the above features. Wearable computers are more closely integrated with people than traditional computers. This requires that the wearable computer must adopt a new human-machine interaction technology to achieve a harmonious human-machine. This is also a hot issue in the current research on wearable computers and the difficulty that must be overcome.
1.2 Wearable Wireless Network In the wearable computer system described above, the hardware devices are mainly connected by a communication cable, and the operating platform used is also based on a wired device. Although this kind of system has its applicability in certain occasions, its shortcomings are obvious: First, it is not flexible enough. Because of the "hard" connection of communication cables, it is bound to affect the activity space and amplitude of the user's body, which is necessary in some applications, such as physical exercise.
Second, it does not consider integration with existing personal communication terminals (such as mobile phones, PDAs, MP3s, etc.). This would make existing communication terminals a separate and functionally overlapping device from the wearable computer entity.
In response to this situation, this paper proposes the concept of a wearable wireless network. Compared to wearable computers, wearable wireless networks have the following characteristics:
(1) Better flexibility.
(2) Fully consider the integration with existing personal communication terminals.
(3) It is possible to perform distributed control. This is because each communication terminal has certain computing processing power and storage capacity (and with the development of very large scale integrated circuits, the performance in this aspect is bound to be further improved).
(4) More humane. The user can select the appropriate primary communication device to control the entire network according to different applications, convenience levels, and personal preferences.
It can be seen that the wearable wireless network should have better applicability and wider application prospect than the wearable computer, and it can be developed on the basis of various existing wireless local area network technologies. Since the existing wireless LAN technologies are relatively mature, they have obvious advantages in development difficulty and development cycle compared to wearable computers.
Semiconductor Fuse and Ferrite
Fuse refers to an electric appliance that, when the current exceeds the specified value, melts the fuse and disconnects the circuit with the heat generated by itself.When the current exceeds the specified value for a period of time, the fuse melts and disconnects the circuit with the heat generated by the fuse itself.A current protector made from this principle.The fuse is widely used in high and low voltage power distribution system and control system as well as power equipment.
Ferrite is a metal oxide with ferrous magnetism.As far as electrical properties are concerned, the resistivity of ferrite is much larger than that of single metal or alloy magnetic materials, and it has higher dielectric properties.Ferrite magnetic energy also shows high permeability at high frequencies.As a result, ferrite has become a non-metallic magnetic material widely used in the field of high frequency and weak current.Due to the low ferrite magnetic energy stored in the unit volume, saturated magnetic induction strength (Bs) and low (usually only pure iron 1/3 ~ 1/5), and thus limits its higher requirements in the low-frequency magnetic energy density in the field of high voltage and high power applications.
Semiconductor Fuse, Fuse Cutout, Protection Fuse, Square Fuse, Fuse Link, Ceramic Fuse, Fuse Box, Fuse Resistors
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