목적 : 회절성 다초점 인공수정체(IOL) 삽입 후 시각적 결과를 알아보고자 하였다. 방법 : 회절성 다초점 Liberty 인공수정체를 삽입한 25명(48안)의 환자를 대상으로 백내장 수술 후 1주, 1개월, 3개월 및 6개월 시점에서 분석하였다. 수술 후 원거리, 근거리 및 중간거리의 나안시력(UCVA)을 측정하고, 시각 적 결과에 대한 만족도 설문조사를 시행하였다. 결과 : 대상자의 평균 연령은 66.23±6.02세였다. 수술 전 구면굴절력은 +1.33±1.78 D였으며, 난시량은 –1.01±0.58 D였다. 수술 전 원거리 나안시력(UCDVA)은 0.75±0.27 (logMAR)이었다. 수술 1주 후 UCDVA는 0.10±0.10 (logMAR), 근거리 나안시력(UNVA)은 0.14±0.10 (logMAR), 중간거리 나안시력(UIVA)은 0.22± 0.12 (logMAR)로 개선되었다. 이러한 개선은 6개월 후에도 지속되어 UCDVA 0.08±0.08 (logMAR), UNVA 0.12±0.09 (logMAR), UIVA 0.20±0.11 (logMAR)로 나타냈다. 1주 후, 평균 구면굴절력은 -0.02±0.50 D, 난 시량은 -0.71±0.47 D였다. 6개월 시점에서 구면굴절력은 0.08±0.49 D, 난시량은 -0.77±0.48 D로 나타났 으며, 이는 수술 전 수치 대비 통계적으로 유의미한 감소(구면굴절력 p<0.001, 난시 p=0.004)를 보였습니다. 백내 장 수술 후 전반적인 만족도는 83.9%였고, UCDVA, UCIVA, UCNVA에 대한 만족도는 각각 76.1%, 65.8%, 73.3%였다. 결론 : 본 연구에서 원거리 나안시력이 가장 우수한 결과를 보였고, 중간거리 나안시력은 원거리 및 근거리 시 력과 비교하여 상대적으로 낮았지만 받아드릴 수 있는 수준이었다. 이러한 임상 결과는 회절성 다초점 IOL이 적절 하게 선별된 백내장 환자에게는 신뢰할 수 있는 선택이라고 생각된다.

One-dimensional MgO nanostructures with various morphologies were synthesized by a thermal evaporation method. The synthesis process was carried out in air at atmospheric pressure, which made the process very simple. A mixed powder of magnesium and active carbon was used as the source powder. The morphologies of the MgO nanostructures were changed by varying the growth temperature. When the growth temperature was 700 °C, untapered nanowires with smooth surfaces were grown. As the temperature increased to 850 °C, 1,000 °C and 1,100 °C, tapered nanobelts, tapered nanowires and then knotted nanowires were sequentially observed. X-ray diffraction analysis revealed that the MgO nanostructures had a cubic crystallographic structure. Energy dispersive X-ray analysis showed that the nanostructures were composed of Mg and O elements, indicating high purity MgO nanostructures. Fourier transform infrared spectra peaks showed the characteristic absorption of MgO. No catalyst particles were observed at the tips of the one-dimensional nanostructures, which suggested that the one-dimensional nanostructures were grown in a vapor-solid growth mechanism.

We report the development of a semi-VLBI observation system operating at 21 cm and present the measurement of visibility function toward the sun using this system. The system consists of two 2.3 meter antennas with a maximum separation of 35 meter, a conventional high speed data acquisition system, and a set of programs for software correlation. Since two local oscillators of receiver modules are independent, data had to be fringe-fitted to yield the visibility amplitude. It is found that the visibility amplitude decreases and then bounces back as baseline increases. We confirm that solar disk with brighter limb best explains the measured visibility amplitude.

  In this paper, we proposed the SCM logistics roadmap in other that the "Northeast Asian Distribution Hub" policy of the government can be realized more effectively. First, we analysed the requirements of SCM roadmap by examining the situation of Northea

In this study, to evaluate the transboundary movement of magnetite waste, the treatment causing possible oxidation and reduction to the highly toxic Cr (VI), as well as other chromium ions must be considered. In this study, we tried to remove chromium using magnetite. The efficiency of chromium removal using magnetite, mixing time, mixing speed, and temperature was evaluated through a jar test. In case of magnetite, the total chromium and hexavalent chromium concentration were rapidly decreased to 0.7 g and 0.35 g, respectively. For mixing speed, the removal efficiency of total chromium was rapidly increased to 150 rpm, but that of hexavalent chromium was almost unchanged. For reaction time, the chromium concentration was almost identical. At 70℃, the removal efficiency of total and hexavalent chromium was 97.2% and 98.8%, respectively; therefore, application of magnetite to actual industrial sites where high-temperature industrial wastewater is generated can be considered.