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RISS 인기검색어
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혐기성 소화를 위한 음식물쓰레기 전처리 방안에 관한 연구
The purpose of this study was to investigate the effective pretreatment of foodwaste for the anaerobic digestion. Considering the foodwaste generation and the anaerobic digester for municipal wastewater sludges, the some pretreatment processes were performed such as the grinding of foodwastes with the addition of water, the mixing with sludges, and the hydrolysis with the addition of NaOH. The results were as followings; 1. As the stage of feasibility test in laboratory scale, the foodwaste grinding using a household garbage disposer was performed with three different water mixing ratios of 1:1, 1:5, and 1:9 as weight base. The physicochemical characteristics of the grinded foodwaste were analyzed and the effective conditions was recommended as the 1:5 mixing ratio of foodwaste and water and the below 8㎜ particle size. 2. And the mixing of foodwaste and municipal wastewater sludge was studied with three different mixing ratios of 1:9, 3:7, and 5:5 as weight base. The physicochemical characteristics of the mixed foodwaste and sludges were analyzed and the effective mixing ratio was recommended as 3:7 of foodwaste and sludge. 3. Finally, the hydrolysis with the addition of NaOH was recommended as the effective pretreatment process and the required hydrolysis time was 10 days.
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알곤 이온빔 입사각에 따른 Polyethylene Naphthalate 필름 표면의 자가나노구조화 및 김서림방지/항균특성 분석
조경환 안동대학교 일반대학원 2021 국내석사
Surfaces on which nanostructures are formed are applied in fields requiring changes in physical, chemical, and optical properties of the surface because physical and chemical properties are changed by nano-sized structures. Nanostructures can change their size, shape and chemical structure through various process methods and conditions, and accordingly, antireflection, superhydrophilic/superhydrophobic, and surface enhanced Raman spectroscopy, SERS), and anti-bacterial properties. In particular, in the case of the ion beam process applied in this study, the shape of the nanostructure can be changed by adjusting the ion incidence angle. Due to the recent Corona 19 incident, interest in anti-bacterial/sterilization is increasing, so the research on films with anti-bacterial properties has been focused. Anti-bacterial films are applied to outdoor kiosks, products used outdoors such as vehicle glass, and transparent masks designed due to issues arising when using masks due to the recent increase in mask usage. In addition, in order to prevent the decrease in visibility caused by fogging due to the product characteristics, a study on the surface having anti-fogging properties through super-hydrophilic was conducted, and as a result, a film having both anti-bacterial and anti-fogging properties was produced. Copper, an anti-bacterial material, was deposited to improve the anti-bacterial activity that is insufficient only with nanostructures. In addition, in order to control the nanostructures formed through the ion beam process to produce nanostructures of the desired size and shape, we tried to analyze the causes of the formation of nanostructures. By comparing the result of the simulation and the actual experiment result through the Stopping and Range of Ions in Matter (SRIM) and nanostructure simulation programs, the cause of the different structure was analyzed. In this study, by using the linear ion source, Ar ions are irradiated on the surface of a Polyethylene Naphthalate (PEN) polymer film at an angle of 0, 30, 45, 60, 80° to form a nanostructure, and copper is deposited through magnetron sputtering to increase anti-bacterial activity. The shape and size of nanostructures were measured through SEM, AFM, and SPIP, and anti-fogging and anti-bacterial properties were evaluated using contact angle measurement, anti-fogging test, and JIS Z 2801 test method. As a result, a surface with an anti-bacterial activity of 99.99% and a contact angle 13.5°which is close to superhydrophilicity was formed, and thus a film having anti-fogging and anti-bacterial properties was prepared.
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도시환경 자율주행을 위한 무인차량의 지능형 주차 알고리즘 개발
조경환 국민대학교 자동차공학전문대학원 2010 국내석사
무인자율주행차량은 각종 센서를 이용하여 차량제어시스템, 항법시스템, 장애물시스템, 통합시스템의 4가지 서브 시스템으로 구성 되어있다. 본 논문은 비접촉 거리측정 장치인 레이저스캐너를 이용하여 무인자율주행차량의 평행주차 및 직각주차 알고리즘 개발을 목적으로 하였다. 이 알고리즘을 검증하기 위하여 GPS와 차량에 6대의 레이저스캐너를 장착하여 이용하였고, 레이저스캐너를 이용한 위치 계산의 오차를 줄이기 위해 타이어 미끄러짐을 최소로 할 수 있도록 5km/h로 차량의 이동 속도를 제한하였다. 상용차 업계에서는 2003년 도요다가 Prius에 모니터를 이용한 주차보조시스템을 옵션으로 판매하였고, 2004년 Volvo는 S60에 평행자동주차시스템을 탑재하였으며, 2008년 폭스바겐은 평행주차시스템을 일부 차종에 탑재하였다. 국내에서는 2010년 2월 ㈜만도에서 초음파 센서를 이용해 주차공간을 인식한 후 전자제어 조향장치를 제어하여 차량을 주차 공간에 평행 및 직각 주차를 자동으로 주차시키는 운전자보조시스템인 자동주차시스템을 개발하였다. 이와 같은 시스템은 운전초보자 또는 여성운전자의 주차를 보조해주는 수준이었다. 본 연구에서는 운전자 보조시스템이 아닌 무인자율주행차량에서 평행 및 직각주차 알고리즘 개발을 하였다.
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