편백나무(Chamaecyparis obtusa)는 측백나무과에 속하며 우리나라 남쪽 지역에서 주로 잘 자 생한다. 편백나무의 목재는 재질이 우수하여 가구로서의 활용이 높으며 남은 목재, 가지, 잎은 정유 추출에 사용되고 있다. 편백 정유는 항염, 향균, 탈취, 진정 효능이 탁월한 것으로 알려져 있다. 본 연구는 이러한 편백나무의 잎에서 추출한 오일이 주름 개선, 피부 장벽 및 보습능에 미치는 영향을 평가하고자 하였다. 먼 저, DPPH assay와 ABTS assay를 통해 항산화 활성을 평가한 결과, 편백 오일은 두 가지 라디칼을 농도 의존적으로 유의하게 소거하였다. 그리고 주름 생성 억제 효능 평가를 위해 elastase 활성을 측정한 결과, 편백 오일은 elastase 활성을 직접적으로 억제시킴을 확인하였다. 다음으로는 real-time PCR을 통해 유전 자 발현을 확인한 결과, 편백 오일은 인간섬유아세포에서 MMP-1 유전자 발현을 유의하게 감소시켰다. 또 한, 편백 오일에 의해 각질형성세포에서 filaggrin과 HAS-2 유전자 발현이 유의하게 증가함을 확인하였다. 이러한 결과를 종합해보면, 편백 오일은 주름 개선과 피부 장벽 및 보습능 강화에 도움을 주어 항노화 화장 품의 기능성 원료로서 활용될 수 있을 것으로 기대된다.

국내외 매년 지속적으로 증가하는 대기오염의 상당량이 선박에서 배출되고 있으며, 이러한 선박에서의 배출량을 감축하기 위 해 정부는 환경규제를 강화하고 해양대기환경 개선을 위해 「환경친화적 선박의 개발 및 보급 촉진에 관한 법률」을 제정 및 시행하여 친환경 에너지를 동력원으로 사용하는 환경친화적 선박을 보급하여 해양오염 저감 기술이 개발되도록 하고 있다. 환경친화적 선박의 기 술은 최근 순수 전기추진 내지는 전기복합 추진체계까지 진화하고 있으나, 선박의 안전한 운용을 위한 검사 및 설비기준 등 관련제도의 정비는 이를 못 따라가는 실정으로, 특히 국내 연안선박의 다수를 차지하는 어선에 대한 제도는 정비가 시급한 시점이다. 이번 연구를 통 해 어선에의 전기복합 추진체계 등의 적용을 위해 핵심기자재인 배터리, 전력변환장치 등을 정의하고 이에 필요한 안전기준을 진단, 마련 하여 친환경 어선의 도입과 보급을 위해 관련된 산업을 지원할 수 있도록 최소한의 안전기준안을 마련하고자 한다.

본 연구에서는 마찰모델에 따라 다른 마찰진자시스템(FPS)이 적용된 교량의 성능을 비교･분석하기 위해 구조해석을 수행하였다. 마찰해석모델 별 성능을 분석하기 위해 PVDF/MgO 마찰재의 마찰계수를 활용하여 쿨롱 마찰모델과 속도 의존 마찰모델을 구축했다. 쿨롱 마찰모델은 마찰속도와 관계없이 단일 마찰계수를 사용하며, 속도 의존 마찰모델은 마찰속도에 따른 마찰계수의 변화를 반영하 는 마찰모델이다. 지진해석으로 비선형 시간 이력 해석과 지진 취약도 해석을 수행하여 구조물의 응답을 확인하였다. 마찰모델에 따 른 바닥판과 교각의 지진 응답을 활용해 면진된 교량의 성능을 분석하였으며, 면진된 교량의 성능을 효과적으로 평가할 수 있는 마찰 모델을 분석했다.

With a rapid expansion in electric vehicles, a huge amount of the spent Li-ion batteries (LIBs) could be discharged in near future. And thus, the proper handling of the spent LIBs is essential to sustainable development in the industry of electrical vehicles. Among various approaches such as pyrometallurgy, hydrometallurgy, and direct recycling, the hydrometallurgical manner has gained interest in recycling the spent LIBs due to its high effectiveness in recycling raw materials (e.g., lithium, nickel, cobalt, and manganese). However, the hydrometallurgical process not only requires the use of large amounts of acids and water resources but also produces toxic gases and wastewater leading to environmental and economic problems, considering potential economic and environmental problems. Thus, this review aims to provide an overview of conventional and state-of-the-art hydrometallurgical processes to recover valuable metals from spent LIBs. First, we briefly introduce the basic principle and materials of LIBs. Then, we briefly introduce the operations and pros-and cons- of hydrometallurgical processes. Finally, this review proposes future research directions in hydrometallurgy, and its potential opportunities in the fundamental and practical challenges regarding its deployment going forward.

High-risk microbial pathogens are handled in a biosafety laboratory. After experiments, the pathogens may remain as contaminants. To safely manage a biosafety laboratory, disinfection of microbial contaminants is necessary. This study was carried out to evaluate the effect of UV-C irradiation for the disinfection of a high-risk plant pathogenic bacterium Erwinia amylovora in a laboratory setting. For the test, the bacterium (8.7 × 106 CFU/ml) was embedded on the surface of PDA and placed on the work surface in a biosafety cabinet (Class 2 Type A1), and on the three different surfaces of the laboratory bench, laboratory bench shelf, and the floor which were positioned in a straight line from the UV lamp installed in the ceiling of the biosafety laboratory (BSL 2 class). UV-C irradiation was administered for 10min, 30min, 1 hr, 2hr, 3 hr, and 4hr, respectively. The reduction rate of bacteria ranged from 95% to 99% in regard to 10 min irradiation, from 97% to 99% in regard to 30 min irradiation, from 99.8% to 99.9% in regard to 1 hr irradiation, and higher than 99.99% in regard to 2 hr irradiation. The bacterium was completely inactivated after 3 hr irradiation. A similar UV-C irradiation effect was obtained when the bacterium was placed at a distance of 1 m from the three different surface points. Bacterial reduction by UV-C irradiation was not significantly different among the three different surface points.

This study was carried out in order to provide suggestions with regard to optimal control methods for various odor emission facilities (162 companies and 26 industrial classifications) through comparative analysis of effective odor treatment technologies for each type of odor substance by literature reviews, based on measured 22 odor substance data for 162 samples taken from A city. The industrial classification of Pulp showed the highest odor quotient (7,589 as average value) and was followed by the industrial classifications of Wastewater, Woods, and Furniture, indicating average odor quotient values of 2,361, 1,396 and 1,392, respectively. Absorption using chlorine dioxide and sodium hydroxide can be an optimal treatment method to remove the odor substances of sulfide and aldehyde groups. Biofilers with microbial communities will be effective to remove odors caused by volatile organic compounds (VOCs) and an absorption method using sulfuric acid is proper for the removal of odor substances caused by nitrogens.

This study sought to conduct a fundamental investigation in order to test and evaluate the thermal performance of an aluminum stick curtain wall system. In terms of the thermal performance index, the infiltration rate of air tightness, thermal transmittance of the heat insulation property and temperature difference ratio of condensation resistance were experimentally measured. The research process can be divided into three parts. First of all, a database for the test report of the curtain wall was compiled and existing design criteria with respect to the evaluation method and standard of transparent building components such as curtain wall, window and door were analyzed to produce the specimens. Secondly, four different types of curtain wall specimens were created through investigating the curtain wall database. Thirdly, standard tests of thermal performance were carried out for airtightness, thermal performance and condensation resistance. As a result, the curtain wall specimens with low-e triple glazing covered by an aluminum capture system showed high thermal performance compared to other curtain wall specimens including low-e triple glazing with a 4-sided structural sealant glazing system. Air tightness of all types of curtain wall specimens satisfied level 1 standard for air tightness. It was found that a curtain wall which consists of a one track frame has difficulties meeting the residential standard of thermal performance with regard to thermal transmittance and condensation resistance.