Quiz 1 API Application Program Interface GEO Geostationary

Quiz #1 • API - Application Program Interface • GEO – Geostationary Earth Orbit • IEEE – Institute for Electrical and Electronic Engineers • EIA – Electronic Industries Association

2. GEO • D * 2 / C = 22, 236 miles * 2 / 186, 282 miles per second = 0. 238735 sec = 238735 s • 238735+53 = 238788 ( s) • 計算公式對可得一半分數。 • s 若與 ms 弄錯，酌扣一半分數。

3. LEO • D * 2 / C = 1500*2/300, 000 = 0. 01 second • 10, 000 s + 53 s = 10, 053 s

4. Infra-red • Laptop • PDA • Handset – Earphone 一般是用 Bluetooth. 除非有找到明 確產品，否則不算對。

Illustration of RS-232 n Start bit l. Same as 0 l Not part of data l. Otherwise the receiver cannot distinguish between an idle line and an initial 1 bit. n Stop bit 2/24/2021 l Same as 1 l Follows data 5

5. Voltage of RS-232 • See Figure 5. 1 (P. 58) • -15 V for 1 • +15 V for 0

6. Stop bit • See Figure 5. 2 (P. 60) • In RS-232 – Start Bit: 0 – Stop Bit: 1

7. Unix Commands • ls – list directory contents • pwd – print working directory • less – similar to “more”, but allows backward movement as well as forward movement. While you are searching a string, it will be highlighted in the context. • gcc – GNU C Compiler

8. Home Directory • According to Wikipedia: – On Unix and Unix-like systems, a user's home directory contains all that user's documents and other personal data, including his configuration files. – It is where a user's focus is located upon login in a shell (as visible at the Command line interface prompt or via the "pwd" command). – 以上兩個回答只要答出一個就算對。