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유사량 조사는 최초로 17세기 초에 이태리에서 실시하였으나 기본 이념이 과학적으로 실시되기는 18세기에 이르러 불란서에서 양적인 유사량을 측정한 것이 처음이었다. 최근에 와서 Linsley(1958)는 상류에서 하류로 유하되는 유사의 60~65%가 하천에서 침전되고 나머지는 유하된다고 하였다.

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• 2002

We have synthesized novel Diphenoquinone(DQ) derivatives. Electron drift mobility of DQ series was measured and electron affinity$(E_a)$ of them is estimated 3.7~3.9eV by CV. Electron drift mobility$(\mu)$ of electric field dependence by time of flight(TOF) technique is $1.76{\times}10^{-5}cm^2/V{\cdot}s$(DQ5) at the concentration of 10wt% verse poly(4,4'-cyclohexylidene diphenylcarbonate)(Pc-Z) and $1.66{\times}10^6V/cm$.