아이작 뉴턴 (Isaac Newton, 그레고리력 1643~1727, 율리우스력 1642~1727 :: 그의 초기 연구는 광학분야에서 두드러졌으며. 스스로 수집 ·정비한 실험기구를 이용해 빛의 분산현상을 관찰하였고, 특히 굴절률과의 관계에 대하여 세밀히 조사하였다.)
뉴턴은 빛의 입자를 미립자라고 불렀다. 그러나 뉴턴도 빛
How does OLED work?
Transport layer
Injection layer
Light : Electro phosphorescence
Light Intensity (Brightness)
-Thickness of organic layer
-Amount of current
What is the Natural History?
일종의 박물학으로서, 야생 동-식물~화석, 지질학의 구조자체까지도 연구
중세시대 때부터 화석, 지질학 분야는 분리되어 오늘날에 고생물학, 지질학이라는 자치적 분야로 인식
Pliny the Elder의 natural history에선 해부학, 심리학 그리고 타문화 인류학상 연구까지 모두 포함되
This idea can be applied to logistics as well. In the past, logistic cost has been defined in purely monetary terms. However, as not only in the EU but also in the USA and other countries became more and more aware of environmental problems ,for instance because of climate change, air pollution, noise and accidents, environmental considerations has been taken in logistics kfield. This is how Gree
Flow around and through fish gills
Jeesoon Choi and Dongyeop Baek
School of Mechanical and Aerospace Engineering, Seoul National University
Abstract. An overall view of the flow over the fish gills is first described by using the active pump system and the passive ram ventilation. The concept of ram ventilation is introduced and its merits of reducing hydrodynamic drags and efficient e