• 줄어드는 삼각주

    줄어드는 삼각주

    과학동아 1991년 02호

    thousands of years, the longest period of stability for any people before or since.What's more, the Nile was a perfect highway. It flowed south to north, and the wind blew steadily north to south. By hoisting sails, boats could travel southward, by lowering the sails the current would carry them northward again. What's more, there were no storms and the river was always peaceful. Trade was ...

  • 일본의 기술

    과학동아 1991년 01호

    to the European circumnavigation of Africa and the discovery of America.) Now the Japanese dream of a modern highway running the width of Asia along the course of the old silk route.They dream also of using the copious water power in the Himalayan mountain range for the production of nonpolluting electrical power of building a road across the northwestern tip of Colombia, just south of the ...

  • 자동차안내 전자지도 시스팀 모니터통해 모든 도로정보를 안다

    자동차안내 전자지도 시스팀 모니터통해 모든 도로정보를 안다

    과학동아 1989년 01호

    전자지도 시스팀의 가격을 크게 내려줄 것이다.미국의 연방고속도로관리소(Federal Highway Administration), 캘리포니아 교통부(California Department of Transportation), GM사는 전자지도 시스팀을 자동차에 교통정보를 수신할 수 있는 특별한 수신기를 부착하는 합동시험을 계획하고 있다. 만약 이 시험이 계획하고 ...