일반적인 제품들은 복합곡면의 형상을 가지고 있으며 해석곡면과 자유곡면을 동시에 가지며 응용분야에서 활용할 수 있는 충분한 정보를 가진 모델링 기법이 필요하다. 초기 설계단계에서는 정확한 데이터나 형상이 이루어지지 않기 때문에 지속적인 수정, 보완작업을 통하여 최종 모델에 도달하게 된다. 최근에는 데이터 측정장치의 발달로 물체 표면의 정확한 측정이 가능하게 됨으로써, 측정데이터로부터 곡면을 형성하는 방법에 대한 역설계, CAD/CAM등 여러분야에서 활발히 진행되고 있다. 이에 본 논문은 역설계를 통한 블레이드를 모델링하여 여러가지의 복합곡면을 재구성하였다.

The preventive effects of sodium molybdate on the acute toxicity of lead were studied by investigating tissue accumulation of lead, changes of nerve conduction velocity and concentrations of metabolites related to function of sciatic nerve in rats treated with lead, sodium molybdate and both, respectively. In lead-intoxicated rat, the conduction velocity, myo-inositol concentration and Na+/K+ ATPase activity of sciatic nerve were decreased by about 33 %, 48 % and 58 %, respectively. However, sodium molybdate treatment significantly normalized the conduction velocity, Na+/K+ ATPase activity and myo-inositol concentration of sciatic nerve in lead-intoxicated rat. Also, sodium molybdate treatment decreased the contents of lead in blood and sciatic nerve through promotion of urinary excretion of lead. But sodium molybdate treatment did not affect the glucose concentration in sciatic nerve. These results suggest that sodium molybdate prevented peripheral neuropathy not only by reducing lead contents in sciatic nerve and blood, but also by enhancing Na+/K+ ATPase activity in sciatic nerve.

The effects of reaction temperature, SO_2 and CO_2 concentration in an air gas stream, particle sizes of limestone on the reactivity and capacity of SO_2 removal have been determined in a thermogravimetric analyser(TGA). The apparent reaction order of sulfation reaction of pre-calcined lime(CaO) with respect to SO_2 is found to be close to unity. The apparent activation energies are found to be 17,000 ㎉/kmol for sulfation of pre-calcined lime and 19,500 ㎉/kmol for direct sulfation of limestone(CaCO_3). The initial sulfation reaction rate of pre-calcined lime increases with increasing temperature, whereas the sulfur capture capacity exhibits a maximum value at 900℃. In direct sulfation of limestone, sulfation reactivity and sulfur capature capacity of sorbent increase with increasing temperature and decreasing CO_2 concentration in a gas bulk stream. The main pore of pre-calcined lime is shifted to the larger pore sizes and pore volume decreases with increasing sulfation time and temperature. The surface area of lime decreases with increasing calcination temperature under an air atmosphere, whereas is rearly constant under a CO_2(5, 10%) atmosphere in a gas stream.