USN = Ubiquitous Sensor Network
(cf. http://octacomm.net/)
ZigBee
Pioneered by Philips Semiconductors, ZigBee is a low data rate, two-way standard for home automation and data networks.
The standard originates from the Firefly Working Group and provides a
specification for up to 254 nodes including one master, managed from a
single remote control. Real usage examples of ZigBee includes home
automation tasks such as turning lights on, turn up the heat, setting
the home security system, or starting the VCR. With ZigBee all these
tasks can be done from anywhere in the home at the touch of a button.
ZigBee also allows for dial-in access via the Internet for automation
control.
The ZigBee standard uses small very low-power devices to
connect together to form a wireless control web. A ZigBee network is
capable of supporting up to 254 client nodes plus one full functional
device (master). ZigBee protocol is optimized for very long battery
life measured in months to years from inexpensive, off-the-shelf
non-rechargeable batteries, and can control lighting, air conditioning
and heating, smoke and fire alarms, and other security devices. The
standard supports 2.4 GHz (worldwide), 868 MHz (Europe) and 915 MHz
(Americas) unlicensed radio bands with range up to 75 meters.
(ref. Philips Semiconductors Protocols - ZigBee)
SNMP = simple network management protocol 간이 망 관리 프로토콜
: a set of protocols for managing complex networks. The
first versions of SNMP were developed in the early 80s. SNMP works by
sending messages, called protocol data units (PDUs), to different parts
of a network. SNMP-compliant devices, called agents, store data about
themselves in Management Information Bases (MIBs) and return this data
to the SNMP requesters.
(1) TCP/IP의 망 관리 프로토콜(RFC 1157). 라우터(router)나 허브(hub) 등 망 기기(network agent)의 망 관리 정보를 망 관리 시스템에 보내는 데 사용되는 표준 통신 규약으로 채용되었다. TCP/IP의 게이트웨이 관리 프로토콜(SGMP:simple gateway management protocol)을 바탕으로 개발되었으며, 개방형 시스템 간 상호 접속(OSI)의 망 공통 관리 정보 프로토콜 (CMIP)에 대응한다. 요구와 응답의 2가지 기능을 사용하여 망 관리 정보를 수집, 관리한다. 1988년에 RFC 1157로 간이 망 관리 프로토콜(SNMP) 표준이 발표되었으며, 1991년에 개정판인 SNMP2가 개발되어 SNMP2에 대응하는 제품도 판매되고 있다.
(2) SNMP와 밀접한 관계가 있는 망 관리 정보 베이스(MIB)의 총칭.
router
IPv6 = Internet protocol version 6
is designed as an evolutionary upgrade to the Internet
Protocol and will, in fact, coexist with the older IPv4 for some time.
IPv6 is designed to allow the Internet to grow steadily, both in terms
of the number of hosts connected and the total amount of data traffic
transmitted.
IP 주소 공간을 128비트로 늘려, 망 확장성이 더욱 향상된 것이 특징이며 IPng(차세대 인터넷 통신 규약)라고도 한다.
WDM = wavelength division multiplexing 파장 분할 다중 방식
CDMA
HPI = human performance times 인간 성능 시간
sensor web / web of sensor
The Sensor
Web is a new type of Geographical Information System (GIS) that can be
embedded into an environment to monitor and control it.
ref.
http://sensorwebs.jpl.nasa.gov/
http://sensorweb.mit.edu/
http://www.sensorsportal.com/HTML/Sensor.htm
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