1. 헬리콥터 개요
Ⓐ 헬리콥터의 역사
헬리콥터 설계의 근대적인 시도는 1486년 레오나르도 다빈치의 설계인 'Helical Air Screw'에서 볼 수 있다. 그는 커다란 나사가 돌아가면서 공기 속으로 올라갈 것이라 생각했다. 비록 동력이나 antitorque 장치에 대한 고려가 없는 개념적인 것이지만, 수직비행에
1. 받음각 (Angle of attack)
① 비행방향의 반대 방향인 공기흐름의 속도방향과 에어포일의 시위 선이 만드는 사이 각.
② 양력, 향력, 피칭모멘트에 가장 큰 영향을 주는 인자.
③ 받음각이 증가하면 양력계수도 증가 (비례함)
④ 받음각을 계속 증가시키면 양력계수가 증가하는 비율이 둔해지다가 어
To understand operation system of SEM
To acknowledge of D.O.F and Resolution
To find what becomes differ by Aperture Size
Aperture
D.O.F / Resolution
Convergence angle
Probe current
Probe diameter
Change Aperture
Change Magnification
How to change D.O.F
How to change resolution
An aperture is a hole or an entrance which is passing light.
Controlling aperture
of brand-assets. For instance, Calvin clein's perfume CK-1 has the shape of turning its cap. It devoted its brand-identity to the targeted consumers that it is differentiated from other brands' graceful cap shapes and its moderate prices.
Marketers can consider various shapes of developing products, packing and stores. It is shown for changing angles, symmetry, proportion and size. The degrees
of LCD) and ultra-thin screen(1/3 of LCD, below 2mm thickness is possible)
3. Flexibility
It can be applicable to the curved shape part.
4. Eco-friendly
It is eco-friendly since it doesn't contain the toxic substances such as Hg.
5. Wide viewing angle
Viewing angle is the range of oblique angle which we can see the normal screen. Unlike LCD, the image quality doesn't change though it is see