중요한 항법 장치로 발전되었다. 전파를 이용한 항법장치로는 단거리용인 ADF와 NDB, VOR, DME. TACAN 등을 들 수 있으며, 또한 장거리 항법용으로는 LORAN, OMEGA와 위성을 이용한 GPS, GLONASS, Galileo 등이 있으나, 위성을 이용하는 항법은 그 중요도를 고려하여 따로 위성항법시스템으로 구분하여 설명한다.
Ⅰ. 비트와 레지스터
1. STATUS 레지스터
명령 실행후의 상태표시 레지스터(03h, 83h에 위치)
1) IRP
레지스터 선택 비트(PIC16C84에서는 필요 없음)
0이면 Bank 0, 1을 쓰고 1이면 Bank 2, 3을 쓴다.
2) RP1, RP0
레지스터 선택 비트(PIC16C84에서는 RP1필요 없음)
00이면 Bank 0, 01이면 Bank 1, 10이면 Bank 2, 11이면 Ban
1. Location-Based Service Background
1.1. Definition of Location-Based Service
Location-Based services refer to general class of computer program-level services used to include specific controls for location and time data as control features in computer programs. Location-Based services utilize location information to improve business productivity as well as adding value to a comfortable life.
its users that is returned from Core Location. Core Location is an iPhone framework that computes the location of the iPhone via GPS, Cell Tower Triangulation, and WPS(Wi-Fi Positioning Service). Messages can be sent with or without scribbled image that users draw, including location information of the client. The client access the web server with its location information to get messages of given
Voice and data access from remote places
Guarantee coverage in non-remote locations
Roaming between existing cellular systems and satellites systems
Key technological challenges of the wide commercial success
Accuracy, Ubiquity of service, Delivery of information instantaneously
LBS (location-based services)
Wireless mobile content services that provide location-specific infor