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- 저자 : 최덕현 ( Dukhyun Choi ) (검색결과 9 건)
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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.
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유진호(Jin ho You),최덕현(Dukhyun Choi),이상민(Sang min Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This paper presents the fabrication of zinc oxide (ZnO) nanorods with various structures by aqueous solution method (ASM) and the characterization of their optical properties. ZnO nanorods with various structures were prepared by controlling the thickness of seed layers and the temperature of main growth. We measured the array shape and growth direction of the fabricated ZnO by scanning electron microscope (SEM), and their optical properties by UV-visible spectrophotometer. We confirmed that their optical properties could be controlled by the density and diameter of ZnO nanorods. Since our strategy can be applied to flexible large-area optical electronics, it may provide a wide range of opportunities for piezoelectric energy generator and transparency solar cell.
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성정빈 ( Zhengbing Ding ),최덕현 ( Dukhyun Choi ) 한국복합재료학회 2022 Composites research Vol.35 No.6
As an emerging power generation technology, triboelectric nanogenerators (TENGs) have received increasing attention due to their boundless promise in energy harvesting and self-powered sensing applications. The recent rise of soft robotics has sparked widespread enthusiasm for developing flexible and soft sensors and actuators. TENGs have been regarded as promising power sources for driving actuators and self-powered sensors, providing a unique approach for the development of soft robots with soft sensors and actuators. In this review, TENG-based soft robots with different morphologies and different functions are introduced. Among them, the design of biomimetic soft robots that imitate the structure, surface morphology, material properties, and sensing/generating mechanisms of nature has greatly benefited in improving the performance of TENGs. In addition, various bionic soft robots have been well improved compared to previous driving methods due to the simple structure, self-powering characteristics, and tunable output of TENGs. Furthermore, we provide a comprehensive review of various studies within specific areas of TENG-enabled soft robotics applications. We first explore various recently developed TENG-based soft robots and a comparative analysis of various device structures, surface morphologies, and nature-inspired materials, and the resulting improvements in TENG performance. Various ubiquitous sensing principles and generation mechanisms used in nature and their analogous artificial TENG designs are demonstrated. Finally, biomimetic applications of TENG enabled in tactile displays as well as in wearable devices, artificial electronic skin and other devices are discussed. System designs, challenges and prospects of TENGs-based sensing and actuation devices in the practical application of soft robotics are analyzed.
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박홍렬 ( Hong Ryul Park ),황운봉 ( Woonbong Hwang ),최덕현 ( Dukhyun Choi ) 한국복합재료학회 2023 Composites research Vol.36 No.2
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.
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이지현 ( Jihyun Lee ),나성민 ( Seongmin Na ),최덕현 ( Dukhyun Choi ) 한국전기전자재료학회 2024 전기전자재료학회논문지 Vol.37 No.1
A triboelectric nanogenerator is a promising energy harvester operated by the combined mechanism of electrostatic induction and contact electrification. It has attracting attention as eco-friendly and sustainable energy generators by harvesting wasting mechanical energies. However, the power generated in the natural environment is accompanied by low frequencies, so that the output power under such input conditions is normally insufficient amount for a variety of industrial applications. In this study, we introduce a non-contact rotational triboelectric nanogenerator using pedaling and gear systems (called by P-TENG), which has a mechanism that produces high power by using rack gear and pinion gear when a large force by a pedal is given. We design the system can rotate the shaft to which the rotor is connected through the conversion of vertical motion to rotational motion between the rack gear and the pinion gear. Furthermore, the system controls the one directional rotation due to the engagement rotation of the two pinion gears and the one-way needle roller bearing. The TENG with a 2 mm gap between the rotor and the stator produces about the power of 200 __ and turns on 82 LEDs under the condition of 800 rpm. We expect that P-TENG can be used in a variety of applications such as operating portable electronics or sterilizing contaminated water.
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초소수성 PMN-PT 표면에서의 액적 충돌을 통한 파이로 전력 생산
한정훈(Jeonghoon Han),오승태(Seungtae Oh),황희재(Hee Jae Hwang),최덕현(Dukhyun Choi),이충엽(Choongyeop Lee),남영석(Youngsuk Nam) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Single crystalline pyroelectric materials offers new opportunities for efficient thermal energy harvesting utilizing temperature fluctuation. Recent works have demonstrated the pyroelectric generators utilizing various thermal energy such as body heat and latent heat of fluids. However, the sustainable and high performance pyroelectric thermal harvesting has not been realized yet. In this work, we introduce the pyroelectric generator utilizing the rapid temperature fluctuation during a droplet impact. The thin single-crystalline PMN-PT of 100 μm thickness was incorporated to the generator in order to improve the pyroelectric coefficient with reducing the thermal mass. Based on the measured pyroelectric current and voltage values, the pyroelectric current prediction model was developed utilizing the correlation of the maximum spreading diameter during drop impact. We believe this work will help to develop efficient pyroelectric thermal energy harvesters.
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ITO-based flexible electronics with optimized bendability using neutral axis engineering
Daesung Yoon(윤대성),Sangmin Lee(이상민),Woonbong Hwang(황운봉),Dukhyun Choi(최덕현) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The importance of flexibility for electronic devices have been emphasized for future potable and wearable electronics, and the buffer material has been employed to increase their bendability. However, because the material property and geometry of a buffer layer could be different for the purpose of the electronic devices, the bendability optimization of the flexible electronic devices is needed depending on the thickness and elastic modulus of that. Here, we report a design rule to optimize the bendability of ITO-based flexible electronics by neutral axis (NA) engineering, considering the correlation between the thickness and the elastic modulus of the buffer layer. Thus, our strategy may provide great advantages for flexible electrodic devices such as organic solar cells, organic light emitting diodes, and organic transistor.
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