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무패턴 마이크로 채널을 이용한 마이크로 막대 광결정 제작
서한복(Han-Bok Seo),현승협(Seung-Hyeop Hyun),이승엽(Seung-Yop Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The photonic crystals have been developed in various fields for the applications to optical devices, bioelectronics and biosensors. In this paper, we fabricate rod-shaped photonic crystals with micro-scale thickness, width, and macro-scale length by using a simple self-assembly process. The micro-channel of hydrophilic substrates without pre-patterns was used to crystalize nanoparticles from the colloidal suspensions injecting in the channels. A lot of long micro-rods were simply fabricated with relatively low defects by a rotational drying process. The fabricated micro-rods with structural color have the width about 1~2 times larger than the thickness, which is identical to the thickness of the micro-channel. The rod-shaped photonic crystals can be applied to biomimetic structural colors with specific patterns, micro-cantilevers and optical devices.
반투과막 내 방사성 물질 제거 미세조류의 흡착 모델 및 특성
서한복(Han-Bok Seo),이상효(Sang-Hyo Lee),홍지은(Jieun Hong),이승엽(Seung-Yop Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The theoretical modeling and characteristics of biosorption using radionuclide-absorbing microalage (Chlorella vulgaris) in low-level radionuclide-contaminated water are implemeted. Radioactive materials such as cesium (Cs) and strontium (Sr) passing through holes in semipermeable membrane are absorbed by microalgae. Basic experiments are performed in order to investigate equilibrium biosorption conditions between C. vulgaris and radionuclides. Based on the experimental results, biosorption characteristics of C. vulgaris on each radionuclide are theoretically established by Langmuir isotherms. A kinetic model on the biosorption process of the proposed membrane system has been developed by mass balances. And simulations of the biosorption efficiency over time have been performed to predict the removal characteristics of radionuclides on the biosortion process.
실리카 나노 입자를 이용한 자기조립 패턴 및 구조색 연구
서한복(Han Bok Seo),김경업(Kyungeop Kim),신부현(Bu Hyun Shin),김미현(Mi Hyun Kim),허남회(Nam Hwi Hur),이승엽(Seung-Yop Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Recently, the structural color by photonic crystal structures has been studied in various fields such as displays and sensors. Various manufacturing methods to compose the photonic crystal structures has been actively proposed. In this paper, we propose a self-assemble manufacturing process using the lifting devices and silica nano-particles on the surface of the glass substrate. The self-assembled manufacturing process using silica nano-particles in solution is based on wet self-assembly which has been developed widely. But the wet self-assembly method has the disadvantage in manufacturing of large scale and complex geometric patterns because of non-uniform surface, difficulty of thickness control and cracks. Therefore, the precise control of the lifting speed, density of silica nano-particles, external temperature and humidity are needed in experiments. We implement various experiments to determine the key factors to gain uniform surface, controllable thickness and defect-free photonic crystal structures. In addition, we measure the wavelength using spectrometer to determine the relationship of the silica nano-particle size of manufactured samples, comparing it to the theoretical wavelength of the structural color.
딱총새우의 버블 충격파를 모사한 마이크로시스티스 파쇄 연구
서한복(Han-Bok Seo),김효정(Hyo-Jung Kim),이상효(Sang-Hyo Lee),김태윤(Taeyoon Kim),이승엽(Seung-Yop Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The pistol shrimp generates shock waves, which is resulted from the generation and collapse of cavitation bubbles when the claws open and close, powerful enough to stun large fish. Microcystis aeruginosa, a cyanobacteria that is the main cause of algal blooms, has the gas-vacuole inside the cell. If the shock wave can be generated by inducing the collapse of the gas-vacuole inside the cell, Microcystis can be destroyed in the short-term or disrupted due to damage to the internal system in the long-term. In this paper, we experimentally studied the disruption characteristics of Microcystis by mimicking the shock wave generating from collapse of cavitation of pistol shrimp. In order to mimic the characteristic of pistol shrimp and analyze their effects for the gas-vacuole, ultrasonic individually with different frequency was used to induce cavitation and collapse of bubbles. Due to the nature of Microcystis cell, the disruption rate for each frequency was observed through short-term and long-term follow-up. The experimental results were compared by various methods of microscope, chlorophyll content, and cell counting. It was shown that there exist specific frequencies that keeping or increase the disruption rate in the long-term.
서한복(Han-Bok Seo),이동준(Dongjun Lee),한송이(Song Yee Han),허남회(Nam Hwi Hur),이승엽(Seung-Yop Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Many researches on artificially fabricated photonic crystal structures has been developed in various fields. Recently, a great attention has been paid on the coloring technology mimicking the structural colors of the living organisms such as Morpho butterfly and peacock. However, previously developed methods have limitations to fabricate 3-dimensional photonic crystals in large scales without defection. In this paper, we propose a new fabrication method for the large-scale photonic crystal structures generating structural colors by improving and combining the dip coating and capillary methods.
반투과막 내 방사성 물질 제거 미세조류의 흡착 모델 및 특성
서한복(Han-Bok Seo),구하라(Hara Ku),이상효(Sang-Hyo Lee),홍지은(Ji Eun Hong),이승엽(Seung-Yop Lee) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.6
본 논문에서는 저준위의 방사성 핵종으로 오염된 물에서 방사성 핵종 흡수성 미세 조류(Chlorella vulgaris)를 이용한 생체 흡착의 이론적 모델링 및 그 특성을 연구하였다. 반투과막을 통과하는 세슘(Cs)과 스트론튬(Sr)과 같은 방사성 물질은 미세 조류에 의해 생체 흡착 될 수 있다. C. vulgaris와 방사성 핵종 사이의 평형 흡착 조건을 확인하기 위한 선행 실험 결과와 Langmuir 등온 흡착 모델을 활용하여 각 방사성 핵종에 대한 C. vulgaris의 생체 흡착 특성을 확보하였다. 또한 제안된 시스템의 생체 흡착 과정에 대한 질량 보존 모델을 설계하여 시간에 따른 생체 흡착 수치해석을 진행하였고 방사성 핵종의 제거 특성과 효율을 예측하였다. The theoretical modeling and characteristics of biosorption using radionuclide-absorbing microalgae (Chlorella vulgaris) in low-level radionuclide-contaminated water are implemented. Radioactive materials such as cesium and strontium that pass through holes in semipermeable membranes are absorbed by microalgae. Equilibrium biosorption conditions between C. vulgaris and the radionuclides are obtained from previous experimental results. The biosorption characteristics of C. vulgaris for each radionuclide are theoretically established using Langmuir isotherms. A kinetic model of the biosorption process of the proposed membrane system has been developed using mass balances. Simulations of the biosorption efficiency over time have been performed to predict the removal of the radionuclides in the biosorption process.
단일 센서를 활용한 Open System 능동 소음 제어 알고리즘 개발 연구
조성우(Sung-Woo Cho),서한복(Han-Bok Seo),박상혁(Sang-Hyuk Park),이승엽(Seung-Yop Lee) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
In this paper, we present a new optimization algorithm to achieve stable noise reduction in open systems using a single sensor. Typically, active noise control in open systems requires the deployment of multiple sensors for noise measurement and control. In contrast, this study investigates the feasibility of achieving effective noise control using one sensor. The designed algorithm not only facilitates real-time noise control but also achieves noise reduction within an open system using a single sensor. The experimental results demonstrate the feasibility of active noise control using a single sensor and sinusoidal inputs. This paper provides a new approach on noise control methodologies, showcasing its potential applicability in open systems requiring noise management
딱총새우를 모사한 캐비테이션 버블 충격파 장치 개발 및 조류 파쇄 연구
박준영(Jun-Yeong Park),서한복(Han-Bok Seo),이승엽(Seung-Yop Lee) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Piston shrimp induces the generation and collapse of cavitation bubbles by fast closure of its claws, generating a shock-wave powerful enough to stun prey. Recently, algae blooms are emerging as a major environmental pollution problem. Two types of cyanobacteria, Microcystis and Anabaena are the main microalgae of this phenomenon. Shockwave can cause damage to cell walls, gas vacuoles and photosynthetic organs, causing short and long term cell disruption. In this paper, a cavitation bubble-based shcokwave device has been developed to effectively disrupt both Microcystis and Anabaena, and the disruption characteristics of both algae were experimentally analyzed. Generation and collapse of nano-bubbles were induced through ultrasound to mimic cavitation shock waves of pistol shrimp, and the disruption rates of Microcystis and Anabaena at various ultrasound frequencies were observed through short-term and long-term measurements. An effective frequency for disrupting cells was selected to develop an optimal nano-bubble shock-wave device. Finally water including high-density algae was taken from the Nakdong River, where the actual algae bloom occurred, and the practical algae-disruption effect by the shockwave device was confirmed.