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- 저자 : 조창우(Changwoo Cho) (검색결과 8 건)
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조창우(Changwoo Cho),김진태(Jintae Kim),박정제(Jeongjae Park),송주훈(Juhoon Song),이미선(Miseon Lee),정주리(Juri Jeong),류재웅(Jaewoong Ryou) 大韓環境工學會 2017 대한환경공학회지 Vol.39 No.5
본 연구는 전라북도 내 하수처리장 방류수를 효율적으로 재이용하기 위해 일일 방류량이 5,000 m<SUP>3</SUP> 이상 되는 12개 하수처리장을 대상으로 방류수 수질을 조사하고 처리장 주변 현황을 파악하여 용도별 재이용 가능성을 제안하는데 목적을 두었다. 추가적으로 방류수를 재처리하기 위한 실험실규모의 실험도 수행하였다. 방류수는 7개 용도별 수질기준에 근거하여 중금속 16개 항목을 포함한 총 28개 항목을 수질 분석하였다. 분석결과 부적합 항목은 색도, BOD, TN, SS, 염화물, 전기전도도 등 6개 항목이며, 색도와 TN이 각각 8개소, 5개소로 가장 높았다. 유입원수가 공단폐수 및 음식물처리수가 유입되는 처리장의 경우 염화물과 전기전도도가 높았다. 방류수 재처리없이 직접 재이용수로 가능한 처리장은 4개소였다. 실험실 규모의 실험(Lab test)은 모래여과(SF)-활성탄흡착(GAC)-정밀여과(MF)-역삼투압(RO) 순으로 실험을 수행하였다. 총대장균군, 색도, 부유물질(SS) 제거는 SF와 GAC조합이 경제성과 처리 효율면에서 가장 적절하였으며, 염화물과 전기전도도는 SF, GAC, MF에서는 큰 효과가 없었으며, RO처리 후 90% 이상의 제거효율을 보였다. UV254는 원수가 0.3651 /cm에서 SF-GAC공정 후 0.0306 /cm로 92% 이상의 높은 제거효율을 보였다. 중금속 중 총붕소(B-total)는 SF-GAC-MF-RO 처리 후 0.7054 mg/L에서 0.0854 mg/L로 88% 제거효율을 보였다. 결론적으로 각 처리장은 방류수 수질분석결과와 주변 지형을 고려하여 방류수 재이용 용도를 선택하여야 한다. 또한 재처리가 필요한 경우 처리할 수질 항목과 처리비용을 고려한 처리방법을 결정하는 것이 적절하다고 판단된다. This study was aimed at investigating effluent water quality and proposing reuse possibilities for 12 sewage treatment plants discharged more than 5,000 m<SUP>3</SUP>/day in order to recycle the sewage treatment plant effluent of Jeollabuk-do effectively. Additionally, a laboratory scale test for reprocessing water discharge was performed. Categories of reclaimed sewage water reuse were divided into 7 topics and analyzed a total of 28 items including 16 heavy metals based on water quality standard. As a results, color, BOD, TN, chloride and Electrical Conductivity (EC) exceeded reused water quality standard. In particular, color and TN exceeded in 8 and 5 sewage treatment plants, respectively. The value of chloride and EC were high in sewage treatment plants including the food and industrial wastewater. At 4 sewage treatment plants were possible to reuse without re-treatment. The laboratory scale test was conducted to SandFilter (SF)-Granular Activated Carbon (GAC)-MicroFiltraion (MF)-Reverse Osmosis (RO). Both the removal efficiencies and economic feasibility of total E. coli., color and Suspended Solid (SS) suited in case using the SF-GAC treatment method. The removal of chloride and EC had little effect in the case of SF-GAC-MF system, but RO showed over 90% of removal efficiency. After using SF-GAC process only, the concentration of UV254 decreased sharply from 0.3651 /cm to 0.0306 /cm and it showed over 92% of removal efficiency rate. In conclusion, for the effective reuse of sewage discharged water, water quality and the surrounding terrain of treatment plants should be all taken into account. If it needed for the reprocessing, both the selection for treatment and economic combination treatment methods will have to be considered.
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CNT/다공성 PDMS와 poly(ethylene oxide) 결합 기반의 웨어러블 자가 발전 압력 감지 소자
조창우(Changwoo Cho),이채은(Chaeeun Lee),오제훈(Je Hoon Oh) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
The development of technologies such as artificial intelligence and the Internet of Things has increased the demand for wearable self-powered pressure sensors. Triboelectric nanogenerator (TENG)-based self-powered pressure sensors have emerged as a solution to meet this demand. However, the measurement of static and small pressure ranges remains a challenge. In this paper, we propose a self-powered pressure sensing device based on the combination of carbon nanotube (CNT)/porous polydimethylsiloxane (PDMS) composite and poly(ethylene oxide) (PEO) film. The proposed device could continuously and reliably measure static and small-range pressure through capacitive pressure sensing while harvesting energy based on the triboelectric effect. The device exhibited a remarkable sensitivity of 1.37 ㎪-1, due to the incorporation of high-k materials (i.e., CNTs) in its porous structure and dielectric layer. It also had a power density of 15 ㎽/m² due to the triboelectric interaction between PDMS and PEO. Finally, the fabricated device was connected to a microcontroller unit to perform energy harvesting and pressure sensing simultaneously, demonstrating its great potential as a wearable device.
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MXene 전극 기반의 고 민감도 Pseudo-capacitive iontronic 압력 센서 와 이를 활용한 혈압 추정
조창우(Changwoo Cho),이채은(Chaeeun Lee),오제훈(Je Hoon Oh) 대한기계학회 2024 대한기계학회 춘추학술대회 Vol.2024 No.11
As the risk of cardiovascular disease is increasing, technology for continuous measurement of blood pressure, the most important parameter, is gaining attention. Although noninvasive measurement methods of photoplethysmography have been introduced, practical methods have been required due to limitations in optical interference. Recently, the demand for wearable pressure sensors has increased due to the growth of electronic technology. Among them, capacitive pressure sensors are preferred due to their various advantages. Among them, iontronic pressure sensors based on ionic liquids (IL) and polymer composites have achieved high capacitance change and sensitivity by using nanometer-sized electric double layers (EDLs) between the composite and electrodes. In this study, we propose an iontronic pressure sensor that utilizes MXene (Ti₃C₂T<sub>x</sub>), a two-dimensional sheet material, as an electrode and combines an IL/polymer composite as a dielectric layer. The layered structure of the MXene electrode of the proposed iontronic pressure sensor adsorbs ions of the IL/polymer composite more effectively and forms an EDLs more quickly. The proposed sensor had a sensitivity of about 104 kPa<sup>-1</sup> and was finally attached to the radial artery to estimate blood pressure.
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다공성 전극 통합을 통한 Iontronic 정전용량형 압력 센서의 민감도 및 유연성 향상
이채은(Chaeeun Lee),박상현(Sanghyun Park),조창우(Changwoo Cho),오제훈(Je Hoon Oh) 대한기계학회 2024 대한기계학회 춘추학술대회 Vol.2024 No.11
Recent advancements in flexible pressure sensor, particularly iontronic capacitive pressure sensors, offer promising prospects for applications in wearable devices and healthcare monitoring. These sensors, employing polymer layers infused with ionic liquid(IL) as dielectric materials, offer high sensitivity, low power consumption, and compatibility with integration. This work introduces porous electrodes to boost flexibility and sensitivity by reducing initial contact area and enhancing capacitance variation under pressure. To fabricate the porous electrodes, polydimethylsiloxane(PDMS) with multi-wall carbon nanotubes(MWCNTs) and a sacrificial sugar particle were mixed. We demonstrated that optimizing the sugar-to-PDMS ratio at 3:1 and incorporating 8 wt% MWCNTs yielded the best sensor performance. This configuration not only minimized the initial contact area, which enhanced the change in contact area as pressure increases but also improved deformability. These sensors exhibited low hysteresis and detected pressures as low as 0.5 Pa, rendering them ideal for various applications necessitating flexible and highly sensitive pressure monitoring.
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