Ⅰ. 피아제
1. 피아제 이론 소개
피아제는 인간의 지적 활동도 유기체적 발달을 거쳐 이루어진다고 보았다. 인간은 나이에 따라 일정한 사고 단계를 거치게 된다는 것이다. 인간의 인지 발달 과정은 생물학적 성장에 따라 크게 나뉘어 네 가지 단계를 거치면서 이루어진다. 이들 각 단계가 시작되고
The optical microscope, often referred to as the "light microscope", is a type of microscope which uses visible light and a system of lenses to magnify images of small samples. Optical microscopes are the oldest design of microscope and were possibly invented in their present compound form in the 17th century. Basic optical microscopes can be very simple, although there are many complex designs w
1 Introduction
When designing an aircraft, it’s all about finding the optimal proportion of the weight of the vehicle and payload. It needs to be strong and stiff enough to withstand the exceptional circumstances in which it has to operate. Durability is an important factor. Also, if a part fails, it doesn’t necessarily result in failure of the whole aircraft.
The main sections of an aircra
History
In 1907 H.J. Round found photo emission phenomena
In 1923 found injection luminescence from SiC
In1962 GE developed semiconductor LED
-> Red color LED become commercialized by GaAsP
In 1970s developed all color of LED except blue color
In the middle of 1990s developed blue color LED in Japan
->All natural color developed
In 2000s
-White LED be used widely
-Energy cut down rema