Preface
You feel as if you were in the night tour at Changdeokgung Palace
with your family, friends, tourists in moonlit night with this book !
This book is the culmination of six years of my research, field study, and personal experience on the subject of the nighttime tour named Moonlight Tour of Changdeokgung Palace. While working as a tour guide at the royal palace, I gave many tou
(1) Definition
Critical infrastructure are systems whose incapacity or destruction would have a debilitating impact on the defense or economic security of nation. They include communications, electrical power systems, gas and oil, highways, pipelines. These kinds of services are essential and provide real value to the public. So, high among the concerns in protecting these systems from harm is
An act of violence or threat of violence against individuals or property committed by one or more individuals acting on behalf on an organization for the purpose of influencing government policy or action to advance a political, religious or ideological cause
Different from war or warlike operations
Terrorism is not new, but its magnitude is.
777 different groups caused 19,856 terrorism-rela
Forest가 3극 진공관 발명
나. 라디오의 성장 (1910-1928)
1912년 타이타닉 호 사건은 무선 커뮤니케이션의 위력을 널리 알림
o 1912년 라디오 법(Radio Act)
- 라디오 사용을 원하는 사람은 누구나 통상, 노동장관의 허가를 얻어야 함
- <방송>이란 단어가 미 해군에 의해 최초로 "명령을 무선으로 한꺼번에 여
1. What is the transportation industry??
1. Concept of transportation
Transport or transportation is the movement of people, animals and goods from one location to another. Modes of transport include air, rail, road, water, cable, pipeline, and space. The field can be divided into infrastructure, vehicles, and operations. Transport is important since it enables trade between peoples, which in