Introduction
For maximum effectiveness and reliability, it is absolutely essential that all weapon systems function perfectly at any time, any place and any electromagnetic environment. Should the performance of any systems become degraded by electromagnetic interference (EMI) – by external or internal sources, such an occurrence can result in a disaster. To prevent degradation at any elec
I. 무선주파수장해(RFI)
1. 무선주파수의 정의: RF (radio frequency)
공중을 전파(傳播)하는 전기 에너지의 모든 주파를 무선주파라 하며, 무선주파수에는
① 지구표면을 따르는 것
② 거의 직선으로 공간을 향하다가 전리층에서 반사 또는 굴절되어 다시 지구로 되돌아오는 것
③ 공중에서 흡수되거나
Ⅰ. 개요
국내 이동통신산업의 경쟁력은 세계최초의 CDMA 상용화에서 비롯되었다. 또한 통신 산업이 설비기반(facilities based) 산업이라는 측면에서 초기에 과감한 CDMA 설비투자와 지속적인 운용기술의 고도화는 결국 국내 이통통신 이용자들에게 연속적으로 세계 최고수준의 서비스를 최초로 제공하게
What is Wireless?
Electromagnetic waves rather than some form of wire or cable
Enable individuals to conduct mobile computing
Wireless – No Wire
Mobile – Changes its location over time
Advantages:
Small enough
Sufficient computing power
Communicative wirelessly
Interference)는 전자파 방해로 인해 발생할 수 있는 기기, 장비, 시스템의 성능저하를 말함
◦ EMS(Electro Magnetic Susceptibility)는 전자파 방해가 존재하지 않는 곳에서 기기, 장 비, 시스템의 성능저하를 일으킬 수 있는 정도를 의미함
◦ EMC(Electro Magnetic Compatibility)는 기기, 장비, 시스템의 주
• Real-time and controllable
Internet advertising can be made according marketer’s demand, and broadcast quickly. But other traditional media has settled broadcast time due to the higher cost. If market wants to modify the advertising after the advertising broadcast is not allowed, because of the higher cost and some other reason. Instead of this internet advertising can change the adver
Airport management, in common with others involved in the operation of elements of the civil air transportation system, are required to take measures that will provide a high level of protection of buildings and equipment (including aircraft), in addition to ensuring the safety and personal security of passengers and staff using the system. This must be done in manner that disturbs the normal ope
1.2 Structure of Planning for Security
Clearly, the subject of security has wide implications that reach far beyond the jurisdictional limits of the airport to central government itself. Planning to meet the needs of a security emergency requires the involvement of a number of organizations, such as:
∎ The airport administration
∎ The operation airlines
∎ The National
1. 이동통신의 개요
1-1 이동통신이란
무선통신이란 공간을 전송매체로 하는 통신으로 송신측에서 정보신호를 전자파에 실어서 공간에 방사하고 수신측에서는 공간을 거쳐 전송되어온 전자파를 수신하여 원래의 신호를 검출하는 방식의 통신이다. 또한 전파를 매체로 해서 통신하기 때문에 사
and gentlemen,
please take your seats
for the demonstration of the aircraft.
What you are about to see is Europes
answer to the electronic battlefield:
the first working prototype
of the Tiger helicopter.
Uniquely manoeuvrable, the Tiger
not only uses Stealth technology,
it is hardened against all forms
of electronic interference,
radio jamming
and electromagnetic radiation.
I have a small sur