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AAO 두께 및 표면 형상에 따른 고체-고체 마찰 대전 기반 에너지 하베스팅 발전 성능에 관한 연구
이광석,황운봉,Kwangseok Lee,Woonbong Hwang 한국복합재료학회 2023 Composites research Vol.36 No.3
Due to the increasing demand for wearable devices and miniaturization of various electronic devices, the trend of nanofabrication in IT devices is underway. In order to overcome the limitations of battery size and capacity, there has been a lot of research interest in energy harvesting technology, also known as triboelectric nanogenerator. AAO(Anodic Aluminum oxide) coated with fluoride is a structure that includes an anode layer with high properties in the triboelectric series, an dielectric layer that helps transfer the triboelectrically generated charges to the electrode without loss, and the electrode. For these reasons, AAO has been a lot of research on its application to frictional energy harvesting nanogenerators. In this work, we analyzed the correlation of AAO between the surface morphology and thickness of the insulating layer by utilizing aluminum oxide, which is advantageous for the application of triboelectric nanogenerators, and adjusting the thickness of the insulating layer.
최덕현(Dukhyun Choi),황운봉(Woonbong Hwang),윤의성(Euisung Yoon),김준원(Joonwon Kim),김동식(Dongsik Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
A new method has been proposed for the calibration of frictional forces in atomic force microscopy. Angle conversion factor is defined using the relationship between torsional angle and frictional signal. Once the factor is obtained from a cantilever, it can be applied to other cantilevers without additional experiments. Moment balance equations on the flat surface and top edge of a commercial step grating are used to obtain angle conversion factor. Proposed method is verified through another step grating test and frictional behavior of Mica.
신호의 투과/반사법을 이용한 통신용 지능구조물 설계 및 제작
유치상(Chi Sang You),황운봉(Woonbong Hwang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The present study aims to design electrically and structurally effective antenna structures in order that the structural surface itself could become the antenna. The basic design concept is composite sandwich structure in which microstrip antenna is embedded and this is termed composite smart structure (CSS). The most important outstanding problem is that composite materials of structural function cannot be used without reducing antenna efficiency. Therefore, the effect of composites facesheet on antenna performances is studied in the first stage by transmission/reflection methods. 'Open condition' is defined when the coefficient of total reflection is one where gain is maximized. With the open condition, wideband antenna can be integrated with mechanical structures without reducing any electrical performances, as confirmed experimentally here.
박홍렬 ( Hong Ryul Park ),황운봉 ( Woonbong Hwang ),최덕현 ( Dukhyun Choi ) 한국복합재료학회 2023 Composites research Vol.36 No.2
유수분리는 석유 생산, 폐수 처리 및 식품 가공을 포함한 다양한 산업 응용 분야와 해양 기름 유출과 같은 환경 분야에서 중요한 과정이다. 물-기름 혼합물의 분리 효율은 혼합물의 유형, 기름과 물의 상태, 적용하고자 하는 기술을 포함한 여러 요인에 의해 영향을 받을 수 있으며, 수년에 걸쳐 물리적, 화학적 및 생물학적 방법으로 물과 기름을 분리하기 위한 다양한 기술이 개발되어 오고 있다. 본 논문은 중력에 의한 분리, 원심 분리, 흡착재, 필터 등을 이용한 유수분리를 포함하여 물-기름 분리에 사용할 수 있는 다양한 방법과 기술에 대해 개략적으로 설명하고자 한다. 각 방법의 장점과 한계를 최근 연구 동향 및 향후 전망과 함께 논의한다. 또한 본 논문에서는 지속 가능하고 환경 친화적인 접근 방식에 특히 중점을 두고 유수분리 분야의 향후 연구와 산업 적용을 위한 방향성을 제시하고자 한다. 결론적으로 본 논문에서는 유수분리 분야의 연구자 및 산업 종사자에게 유용할 수 있는 최근 유수 분리 기술에 대한 포괄적인 개요를 제공하고자 한다. Oil-water separation is a critical process for several industrial applications, including oil production, wastewater treatment, food processing, and environmental area such as marine oil spills. The separation efficiency of oil-water mixtures can be influenced by various factors such as mixture composition, oil and water conditions, and the separation technology used. Over the years, various technologies have been developed to separate water and oil by physical, chemical and biological methods. This paper presents an overview of the various methods and technologies available for oil-water separation, including gravity separation, centrifugal separation, and separation using adsorbents, filters. The strengths and limitations of each method are discussed, along with recent research trends and future prospects. Furthermore, this paper aims to provide direction for future research and industrial application of sustainable and environmentally friendly oil-water separation technologies. In conclusion, we provide a comprehensive overview of recent oil-water separation technologies that will be beneficial to researchers and industrialists in the field of oil-water separation.
양극산화기법을 이용한 나노딤플구조물 제조 및 젖음성 연구
김동현(Dong Hyun Kim),황운봉(Woonbong Hwang),김준원(Joonwon Kim),이건홍(Kun Hong Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
this paper, a wetting phenomenon of nanodimple structured surfaces was investigated, with particular attention devoted to the relation of the apparent contact angle and the fraction of contact area. For this purpose, Nanodimple structures which had various dimple sizes were fabricated by using an anodizing method and two types wetting test were performed. One is a hydrophilic type wetting test, and the other is a hydrophobic type test. Test results were deferent with existing wetting theories. The nanodimple surface made the apparent contact angle of the hydrophilic aluminum increase and made the apparent contact angle of the hydrophobic coated aluminum decrease. To verify these results, the modified Cassie & Boxter’s equation for the dimple geometry was induced and compared with test results.