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호동해(Donghae Ho),조수영(Sooyoung Cho),최윤영(Yoon Young Choi),최영진(Young Jin Choi),조정호(Jeong Ho Cho) 한국세라믹학회 2020 세라미스트 Vol.23 No.1
Recently, polymer-metal composite (IPMC)-based ionic artificial muscle has been drawing a huge attention for its excellent soft actuator performance having outstanding soft actuator performance with efficient conversion of electrical energy to mechanical energy under low working voltage. In addition, light, flexible and soft nature of IPMC and high bending strain response enabled development of versatile sensor application in association with soft actuator. In this paper, current issues of IPMC were discussed including standardizing preparation steps, relaxation under DC bias, inhibiting solvent evaporation, and improving poor output force. Solutions for these drawbacks of IPMC have recently been suggested in recent studies. After following explanation of the IPMC working mechanism, we investigate the main factors that affect the operating performance of the IPMC. Then, we reviewed the optimized IPMC actuator fabrication conditions especially for the preparation process, additive selection for a thicker membrane, water content, solvent substitutes, encapsulation, etc. Lastly, we considered the pros and cons of IPMCs for sensor application in a theoretical and experimental point of view. The strategies discussed in this paper to overcome such deficiencies of IPMCs are highly expected to provide a scope for IPMC utilization in soft robotics application.
호동해,강웅기,김봉수,조정호 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Synthesis of an Ambipolar Siloe-based Small Molecular Semiconductor and Its Application in Transistor and Nonvolatile Memory Device. We characterized the electrical properties of field-effect transistor and nonvolatile memory based on Si1TDPP-EE-C<sup>6</sup>. FESTs device exhibited ambipolar transport properties with a hole mobility of 7.3×10<sup>-5</sup>㎠/Vs and an electron mobility of 1.6×10<sup>-5</sup>㎠/Vs. Annealing at 110°C leads to increase in the carrier mobility, hole and electron mobilities of 3.7×10<sup>-3</sup> and 5.1×10<sup>-4</sup>㎠/Vs, repectively. The change in crystalline structure and surface morphology were investigated by grazing incidence X-ray diffraction and atomic force microscopy, which indicated that annealing improved the film crystallinity and promoted the formation of a longer-range lamellar structure. Moreover, nonvolatile memory based on Si1TDPP-EE-C<sub>6</sub> was demonstrated by the incorporatoin of Au NPs as charge trapping sites at the interface between SiO<sup>2</sup> and cross-linked PVP dielectrics. The device exhibited reliable non-volatile memory characteristics, which include memory window of 98 V, on/off-current ratio of 10<sup>3</sup>.
주파수 영역 확산광 단층촬영 장치를 이용한 광 팬텀 및 인체조직의 광 계수 측정
호동수,권기운,엄기윤,이승덕,김법민,Ho, Dong-Su,Kwon, Ki-Woon,Eom, Gi-Yun,Lee, Seung-Duk,Kim, Beop-Min 대한의용생체공학회 2007 의공학회지 Vol.28 No.2
Diffuse optical tomography (DOT) is a relatively new medical imaging modality which uses near infrared light to image large-sized tissues noninvasively. We constructed a frequency-domain DOT system to measure the optical properties of optical phantoms and human tissues. The FD-DOT uses the intensity-modulated infrared light source that illuminates the biological tissues. The phase shift and modulation changes at each detector site are separately processed to measure the optical properties. The absorption and scattering coefficients are separately estimated using inverse algorithms.
Optical Skin-fat Thickness Measurement Using Miniaturized Chip LEDs: A Preliminary Human Study
호동수,김예화,황인덕,신건수,오정택,김법민 한국광학회 2009 Current Optics and Photonics Vol.13 No.3
We tested the feasibility of measuring fat thickness using a miniaturized chip LED sensor module, testing 12 healthy female subjects. The module consisted of a single detector and four sources at four different source-detector distances (SD). A segmental curve-fitting procedure was applied, using an empirical algorithm obtained by Monte-Carlo simulation, and fat thicknesses were estimated. These thicknesses were compared to computed-tomography (CT) results; the correlation coefficient between CT and optical measurements was 0.932 for bicep sites. The mean percentage error between the two measurements was 13.12%. We conclude that fat thickness can be efficiently measured using the simple sensor module.
호동해,Jing Han,Jinrong Huang,Yoon Young Choi,Siuk Cheon,Jia Sun,Yanqiang Lei,Gyeong Seok Park,Zhong Lin Wang,Qijun Sun,조정호 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Wearable textile electronics have been extensively developed with versatile functionality and self-powered autonomy. The nonwoven fabric fabricated by solution blow spinning (SBS) was successfully applied as the triboelectric layer in TENGs. The uniaxial elongation of the polymer chains along the fiber axis during the SBS process promoted the formation of polar β-phase crystals in the solution-blow-spun nanofibers, which led to a negative shift in the surface potential and enhancement of the TENG performances. The constructed fabric TENG delivered excellent output performances such as a high open-circuit voltage of 260 V, short-circuit current of 27μA, and high output power of 7mW. The proposed β-phase-preferential blow-spun fabric TENGs are highly promising for application to next-generation intelligent textronics and self-powered human robot interaction interfaces.