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방재와 홍수저감 및 수자원 확보 측면에서 바라본 한반도 대운하
신은우,Sin, Eun-U 한국기술사회 2008 技術士 Vol.41 No.2
At this point, the Pan-Korea Grand Waterway (PKGW) has negative views and various complicated problems, but the government chose PKGW as important project for having a benefit in physical distribution, tourism, aggregate sale and new employment as well as in view of disaster prevention, flood control, irrigation. The government makes special laws for PKGW in evaluating environment effect and the safety of existing facilities and considers countermeasures for the rehabilitation, movement and redevelopment of facilities by related company and specialist. From analyzing and investigating the collective results in detail and in stages, the PKGW is the best choice by which korea engineers can hand over pleasant and beautiful korea to next generation in world.
Cadmium Removal by Juniperus monosperma: the Role of Calcium Oxalate Monohydrate Structure in Bark
신은우 한국화학공학회 2005 Korean Journal of Chemical Engineering Vol.22 No.4
This study suggests that calcium oxalate monohydrate over Juniperus monosperma bark is an ion-ex-changeable site for cadmium adsorption on the basis of its cadmium adsorption behavior and surface characterization.Cadmium adsorption behavior showed that juniper bark had a higher cadmium adsorption capacity (84.6mol Cd g1 atpH 5) than juniper wood (32.0mol Cd g1 at pH 5), and that the base-treatment improved the cadmium adsorption capacity of only juniper wood. This difference between juniper bark and wood might have originated from diferentof calcium ions displaced, which indicated that calcium played an important role in cadmium adsorption onto juniperbark. X-ray diffraction (XRD) results gave evidence that only juniper bark contained the structure of calcium oxalate monohydrate. Furthermore, cadmium adsorption decreased the intensity of the characteristic XRD peaks for calciumoxalate monohydrate. In diffuse reflectance infrared Fourier transform (DRIFT) spectra, existence of oxalate on juniperbark was proven again and interpretation on IR band of carbonyl groups matched significantly the cadmium adsorption behavior.