This study investigated the degradation characteristics and biodegradability of phenol, refractory organic matters, by injecting MgO and CaO-known to be catalyst materials for the ozonation process-into a Dielectric Barrier Discharge (DBD) plasma. MgO and CaO were injected at 0, 0.5, 1.0, and 2 g/L, and the pH was not adjusted separately to examine the optimal injection amounts of MgO and CaO. When MgO and CaO were injected, the phenol decomposition rate was increased, and the reaction time was found to decrease by 2.1 to 2.6 times. In addition, during CaO injection, intermediate products combined with Ca2+ to cause precipitation, which increased the COD (chemical oxygen demand) removal rate by approximately 2.4 times. The biodegradability of plasma treated water increased with increase in the phenol decomposition rate and increased as the amount of the generated intermediate products increased. The biodegradability was the highest in the plasma reaction with MgO injection as compared to when the DBD plasma pH was adjusted. Thus, it was found that a DBD plasma can degrade non-biodegradable phenols and increase biodegradability.

알칼리성 산업부산물의 혼합에 따른 연안 오염퇴적물의 성상 변화를 평가하기 위해 해수 교환을 고려한 mesocosm 실험을 수행 하였다. 실험시작 1개월 후 실험구의 인산인 농도는 대조구 대비 간극수와 직상수에서 각각 19.0, 0.4 mg/L 낮게 검출되었다. 이는 GCA에서 용출된 칼슘이온과 인산인의 흡착반응을 통한 간극수 내의 인 고정 및 직상수로의 용출 억제에 따른 결과로 판단된다. 실험구의 간극수 내 황화수소 농도는 5.0 mg/L로 112.5 mg/L인 대조구에 비해 매우 낮게 나타났으며, 실험구 직상수의 DO 농도는 대조구에 비해 3.47 mg/L 높게 나타났다. 이상의 결과로부터 알칼리성 산업부산물인 GCA는 연안 오염퇴적물의 개선에 효과적인 재료임을 확인하였다.

소성 굴 패각의 PO4-P 및 NH3-N의 제거성능을 평가하기 위해 100℃(POS100), 600℃(POS600), 800℃(POS800)로 소성시킨 굴 패각을 시료충전층에 채워 인공오수를 통과시키는 실내실험을 통해 PO4-P 및 NH3-N의 제거 성능을 확인하였다. 시료충전층을 통과한 유출수는 굴 패각에서 용출된 CaO의 영향으로 pH가 상승한 것으로 조사되었다. PO4-P 제거량은 최대 약 23.1 mg/kg(POS100), 16.1 mg/kg(POS600), 15.9 mg/kg(POS800)으로, POS100의 PO4-P 제거량이 높게 나타난 것으로 확인되었다. PO4-P 제거 요인으로는 굴 패각의 Ca 및 Dolomite가 PO4-P를 흡착·침전시킨 것으로 판단된다. NH3-N 제거량은 최대 약 3.56 mg/kg(POS100), 5.72 mg/kg(POS600), 3.97 mg/kg(POS800)으로 나타났다. NH3-N의 제거율이 낮은 요인으로는 불안정한 질산화 과정, pH의 상승으로 인해 NH3-N가 NH4 +로 변환된 영향 등의 복합적인 원인으로 판단된다. 이상의 결과를 통해 소성 굴 패각은 화학 반응을 통해 PO4-P 및 NH3-N 농도를 감소시킨 것으로 판단되며, 본 연구의 결과는 향후 소성 굴 패각을 활용한 하수처리 기술개발을 위한 기초자료로 활용 될 수 있을 것으로 판단된다.

The purpose of this study was to determine the effects of mixed or split-sex feeding on growth performance and behavior of Korean native chickens. Three variants of the sex ratio, FO (female only), MO (male only) and MI (mixed) were tested in Korean native chickens (Hanhyop 3) that were between the ages of 7 and 91 days. Body weight gain was the highest (p<0.05) in the MO treatment and the lowest (p<0.05) in the MI treatment. The feed intake (FI) of birds in the MO treatment was higher (p<0.05) than that of birds in the MI treatment during days 14-21, also MO treatment was higher (p<0.05) than that of birds in the MI treatment during days 21-28. However, the FI of birds in the MI group was higher (p<0.05) than that of birds in FO treatment during days 35-42. The behavioral frequency of walking, drinking, and aggressive pecking were not affected by sex ratio treatment. The behavioral frequency of feeding was higher in the FO treatment than that of birds in the other treatments. The comfort time of birds in the MI treatment was longer (p<0.05) than that of birds in the other treatments. The behavioral frequency of pecking was higher in the MO treatment than that of birds in the other treatments. The study suggests that when male and female Korean native chickens are reared together, sex ratio can influence growth performance and behavior frequency.

This objective of this study was to investigate the degradation characteristics of phenol, a refractory substance, by using a submerged dielectric barrier discharge (DBD) plasma reactor. To indirectly determine the concentration of active species produced in the DBD plasma, the dissolved ozone was measured. To investigate the phenol degradation characteristics, the phenol and chemical oxygen demand (COD) concentrations were evaluated based on pH and the discharge power. The dissolved ozone was measured based on the air flow rate and power discharged. The highest dissolved ozone concentration was recorded when the injected air flow rate was 5 L/min. At a discharge power of 40W as compared to 70W, the dissolved ozone was approximately 2.7 – 6.5 times higher. In regards to phenol degradation, the final degradation rate was highest at about 74.06%, when the initial pH was 10. At a discharged power of 40W, the rate of phenol decomposition was observed to be approximately 1.25 times higher compared to when the discharged power was 70W. It was established that the phenol degradation reaction was a primary reaction, and when the discharge power was 40W as opposed to 70W, the reaction rate constant(k) was approximately 1.72 times higher.

In this paper, the boom of a 30m class refracted insulation with outrigger on aerial elevating work platform is modeled as 3D CAD program of CATIA. The static and dynamic analyses are performed by using ANSYS and ADAMS programs, respectively. The refracted insulation boom uses acetal and the composite boom for insulation. And the composite insulation boom is modeled by using ACP (Ansys Composite Prepost) of ANSYS program. In order to analyze the durability of refracted insulation boom, the static analysis is performed and each analyzed part is stored as =MNF-type flexible body model. The dynamic analysis is performed with ADAMS by using the flexible model. As the result, these analyzes clarify the structural stability and dynamic durability (hot spot) of the refracted insulation boom.

고순도 프로필렌(프로펜)은 옥탄가를 높이는 화합물이며 산업적으로 중요한 화합물들의 원료가 된다. 프로판 혼합물로부터 프로펜을 정제하는 것은 비슷한 끓는점으로 인해 기술적으로 어려우며, 큰 비용이 요구된다. ZIF-8 분리막은 분 자체 메커니즘에 의해 효율적으로 프로판으로부터 프로필렌을 분리할 수 있는 가능성 때문에 많은 연구가 진행되고 있다. ZIF-8 분리막에 대한 관심이 커지는 것은 소위 “gate opening” 효과 때문이다. 프로필렌/프로판 혼합물로부터 프로필렌 분리를 높이기 위해 “gate opening” 효과는 분리막 기공을 확장시켜 더 크고 무거운 프로판은 피드 흐름에 유지시키며, 프로필렌 만 선택적으로 투과할 수 있도록 한다. 본 논문에서는 ZIF-8 분리막 제조에 널리 적용되는 방법들과 분리막을 통한 프로필렌 투과도 및 선택도에 영향을 주는 인자들에 대해 살펴보고자 한다.

Lipomas are the most common benign mesenchymal tumors composed of mature adipocytes. They are usually slow-growing, soft and asymptomatic masses. Angiolipomas are rare benign soft tissue tumors that are distinguished from common lipomas by a marked degree of vascularization. The diagnosis and prognosis of angiolipomas are based entirely on the findings of histological evaluations. Angiolipoma, showing characteristics of both lipoma and hemangioma, usually develop in the trunk and extremities, and rarely arise in the head and neck region. Angiolipoma of the cheek is very rare. This report presents the clinical and histopathological features of infiltrating angiolipoma excised from the cheek.

As ZIF materials have their unique properties such as high surface area, tunable pore structure, thermal and chemical stability, they can be used in gas separation. In this work, we synthesized ZIF-8 seed layer by combining ZnO coating on the support and the conversion synthesis of ZnO layer in H-mIm solution to ZIF-8 layer, followed by the secondary growth synthesis for ZIF-8 membranes. The effect of solvent on conversion seeding had been investigated to control the reaction rate combining the dissolution rate of ZnO and the crystallization rate. The optimum solvent combination (water and methanol) was studied according to the thickness of the ZnO layer used in the conversion seeding. The obtained membranes showed excellent performance for propylene/propane gas separation. The thicker the ZnO layer, the lower the permeability.