목적: 본 연구는 광개시제 및 광촉매제를 사용하여 460nm의 가시광선 영역에서 중합한 콘택트렌즈의 물리적 특성을 분석하여 이 물질들의 콘택트렌즈 재료로서의 적합성을 알아보았다. 방법: 고분자의 중합은 2-hydroxy ethyl methacrylate(HEMA), ethylene glycol dimethacrylate(EGDMA)를 기본조합으로 하였으며, 개시제로 azobisisobutyronitrile(AIBN)를 사용하였다. 그리고 광중합을 위하여 광촉매제 및 광개시제를 1%, 3% 각각 첨가하였다. 제조된 시료의 물리적 특성 변화를 알아보기 위하여 460nm의 가시광선영역에서 2분, 3분, 4분, 5분 으로 구분하여 광중합 하였고, 각각 광투과율, 굴절률, 함수율을 각각 측정하였다. 또한, 수화 1일후. 3일 후, 6일 후에 따른 물성변화를 각각 측정하였다. 결과: 열중합한 렌즈의 경우, 수화 1일 후, 3일 후, 6일 후 가시광선 영역에서의 광투과율은 83.55~90.72%, 굴절률은 1.4421~1.4433, 함수율은 38.16~39.62%로 나타났다. 또한 2분 광중합한 렌즈의 경우, 가시광선 영역의 광투과율은 90.79~91.09%, 굴절률은 1.4353~1.4398, 함수율은 35.11~37.60%로 나타났으며, 3분 광중합한 렌즈의 경우, 광투과율은 84.73~89.45%, 굴절률은 1.4391~1.4414, 함수율은 36.26~37.15%로 나타났다. 4분 광중합한 렌즈의 경우, 광투과율은 90.86~92.35%, 굴절률은 1.4410~1.4439, 함수율은 37.61~39.83%로 나타났다. 그리고 5분 광중합한 렌즈의 경우, 광투과율은 90.42~91.16%, 굴절률은 1,4391~1.4421, 함수율은 37.46~39.21%로 나타났다. 물리적 특성 측정 결과, 중합 시간에 따라 함수율과 굴절률은 큰 차이를 나타내지 않았다. 또한 광투과율의 경우 중합시간이 증가함에 따라 변화량의 차이가 감소하는 경향을 나타내어 중합도가 증가하는 경향을 나타내었다. 결론: 본 연구를 통해 광촉매제 및 광개시제를 첨가하여 광중합한 렌즈는 콘택트렌즈의 기본적인 물성을 만족시키고, 중합시간이 증가할수록 물리적 특성의 변화가 감소되므로, 콘택트렌즈의 소재로 적합하다고 판단된다.

In this study, we analyzed the effect of the drainage slope to collapse. The presence of drainage has a low correlation with the collapse of the slope. But drainage of the drainage has an important role in preventing the decay slope. Therefore, the drain state is very important in order to evaluate the drainage.

In this study, weight of assessment items for rock and soil slopes is deducted using AHP(Analytic Hierarchy Process). And also, weight of each performance for final evaluation is analyzed. As a result, tension crack and ground deformation make up a large proportion in all slopes, and weight of each performance based on the location of the slope does not show a big difference.

The Characteristics of water catchment terrain on the cut-slopes of general nation road was analyzed. As the water catchment terrain increased the frequency defects on slopes are increased, and it shows a linear increase pattern. As a results of analyzing the location of water catchment terrain, when the intersection line of water catchment terrain located in the slopes the frequency defects were higher then it located top of slopes. also the types of defects were different.

Evaluation criteria for rockfall is proposed using 137 real data. Rockfall data was classified 3 categories considering damage level of rockfall protection fence, and rockfall energy for each was made a calculation. In results, 50kJ, 70kJ and 117kJ of rockfall energy are proposed as evaluation criteria.

The cut slope distributed in domestic, which have single horizontal extension over 200m and 50m of vertical height are classified into 2nd class facility by <Special Act On The Safety Management Of Structures>. Collapse of these cut slope occurs by thaw, rainfall, soil characteristics. Recently, frequency of small size cut slope collapse is increasing. Accordingly, central government partially revised <Special Act On The Safety Management Of Structures> with the contents of expansion of 2nd class facility's scope and standard and it is expected to be an effective maintenance and management measures of cut slope. Therefore, this study analyzed distribution type and characteristics of the national highway cut slope within the scope of relevant laws and regulations based on the status data of 2nd class facility (cut slope) to examine the maintenance status.

Evaluation items were deducted by based on literature materials to supplement the evaluation system of rock cut-slope in national road. Delphi survey of experts were conducted to review the final evaluation items. As a result of reviewing the significance through stepwise multiple linear regression, all of deducted items were statistically significant because these had lower P-value than 0.05. And It was confirmed that the items were selected appropriately as they had relatively similar levels of the weight.

In this paper, the strategy of the research project was introduced to develop the safety evaluation factors and the monitering system of underground lifelines against the ground subsidence. This study will be carried out in three steps of concept design, critical technique development and technique verification.

In this study, evaluation factors(internal and external) and research plan for slopes were introduced to develop the performance-based slope evaluation methodology along the road and railroad. This study will be conducted in three stages of concept design, critical technique development and technique verification.