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Minjeong Lee(Minjeong Lee),Hyojung Bae(Hyojung Bae),Hokyun Rho(Hokyun Rho),Vishal Burungale(Vishal Burungale ),Pratik Mane(Pratik Mane ),Chaewon Seong(Chaewon Seong),Jun-Seok Ha(Jun-Seok Ha) 한국마이크로전자및패키징학회 2020 마이크로전자 및 패키징학회지 Vol.27 No.4
The Cu/Cu2O/CuO photoelectrode has been successfully fabricated by Rapid Thermal Annealing technique. The structural characterization of fabricated photoelectrode was performed using X-Ray diffraction, while elemental composition of the prepared material has been checked with X-Ray Photoelectron Spectroscopy. The synthesis parameters are optimized on the basis of photoelectrochemical performance. The best photoelectrochemical performance has been observed for the Cu/Cu2O/CuO photoelectrode fabricated at 550 ℃ oxidation temperature and oxidation time of 50 seconds with highest photocurrent density of -3 mA/㎠ at -0.13 V vs. RHE.
Seung Hyeun Lee(Seung Hyeun Lee),Minjeong Kim(Minjeong Kim),Won Jun Lee(Won Jun Lee),Yeoun Sook Chun(Yeoun Sook Chun),Kyoung Woo Kim(Kyoung Woo Kim) 대한안과학회 2022 Korean Journal of Ophthalmology Vol.36 No.6
Purpose: To evaluate the effect of the intense pulsed light (IPL) and meibomian gland (MG) expression (MGX) combination therapy according to the total numbers of sessions in the meibomian gland dysfunction (MGD). Methods: Ninety patients with MGD were included. Patients had maximal five sessions of IPL (Aqua Cel, Jeisys Medical) and MGX combination therapy at 2-week intervals. The ocular surface disease index (OSDI) questionnaire score, MG profile grades, tear matrix metalloproteinase-9 (MMP-9), tear break-up time (BUT), tear osmolarity, tear secretion, and corneal erosions were evaluated. Results: The number of patients who had a total of one to five sessions (1S to 5S) was 10, 25, 17, 20, and 18, respectively. The time-serial decrease of OSDI scores was significant in patients who had three or more sessions (3S, p = 0.002; 4S, p < 0.001; 5S, p < 0.001). The MG expressibility grade decreased with two or more sessions (2S–5S, p < 0.001), but the meibum quality significantly improved with all sessions (1S, p = 0.012; 2S, p = 0.024; 3S, p = 0.015; 4S, p < 0.001; 5S, p < 0.001). Although tear BUT increased even in patients with one session (1S, p = 0.040; 3S, p = 0.005; 4S, p = 0.006; 5S, p = 0.021), tear MMP-9, osmolarity, Schirmer I, and corneal erosions were not improved in every number of sessions. The female sex was the sole contributor to the final symptomatic improvement (p = 0.042), and the MGD stages were not related to the final OSDI decrease. Conclusions: The OSDI score, MGD grades, and BUT were improved after the IPL and MGX combination therapy in MGD patients. Unlike MGD grades and tear film instability might be improved just after a few sessions, the overall subjective relief was accomplished in three or more sessions.
The Influence of Life Stress and Sleep Disturbance on White Matter Integrity
Kim Minjeong,Lee Jiye,Kim Nambeom,Hwang Yunjee,Lee Kyung Hwa,Lee Jooyoung,Lee Yu Jin,Kim Seog Ju 대한신경정신의학회 2023 PSYCHIATRY INVESTIGATION Vol.20 No.5
Objective This study investigated whether sleep and stress mutually interact to induce changes in white matter integrity.Methods Diffusion tensor imaging (DTI) was conducted on 36 participants (male=22, female=14; mean age=38.33±12.78 years). Participants were divided into three groups depending on their sleep quality and stress levels: poor sleepers with stress, poor sleepers without stress, and good sleepers. Sleep quality and stress level were evaluated using the Pittsburgh Sleep Quality Index and the Life Experiences Survey, respectively. Fractional anisotropy (FA) values were calculated employing DTI tractography.Results After controlling for age and sex, poor sleepers with stress exhibited a lower FA of the left inferior cerebellar peduncle (ICP) than did poor sleepers without stress (t=2.81, p=0.02). Poor sleepers without stress showed a higher FA of the right middle longitudinal fasciculus (MdLF) than did good sleepers (t=3.35, p=0.006).Conclusion The current study reports the effects of sleep, stress, and their interaction on the white matter integrities of the ICP and MdLF. ICP change seems to be associated with sleep disturbances related to stress, while MdLF change would be associated with sleep disturbances unrelated to stress.
지하철 역사 내 실내 공기질 개선을 위한 정전분무 공기청정기의 성능평가
이강산(Kang-San LEE),박준수(Junsu PARK),이길봉(Gilbong LEE),이계중(Kye Jung LEE),조민정(Minjeong CHO),이미혜(Meehye LEE),최종원(Jongwon CHOI) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
지하철 역사 내부에서 발생하는 대표적인 실내공기 오염물질로는 미세먼지, 부유세균, 그리고 휘발성 유기화합물이 있다. 각각의 오염물질을 처리하기 위해서는 필터를 이용한 여과시스템, UV-C를 이용한 살균시스템, 광촉매를 이용한 산화시스템 등 별도의 독립적인 시스템을 도입해야하므로, 높은 설치비용 및 유지 보수비용에 소비자는 부담을 느낄 수 있다. 따라서 본 연구에서는 미세먼지, 부유세균, 휘발성 유기화합물을 동시에 저감시킬 수 있는 물을 이용한 정전분무 기술을 제안한다. 정전분무 시 생산되는 높은 하전을 띈 미세 물 액적은 미세먼지와 직접 충돌 및 전기적 인력에 의한 간접 충돌로 인해 높은 효율로 미세먼지를 집진할 수 있다. 한편, 물을 이용한 정전분무 시 생성되는 수산화 이온은 높은 전기장 환경에서 에너지를 받아 수산화 라디컬로 변함과 동시에 2개의 수산화 라디컬이 반응을 일으켜 과산화수소가 된다. 이렇게 생산된 과산화수소수와 공기 내 산소가 오존으로 변한 이후 물에 흡수된 오존수는 부유세균의 살균과 휘발성 유기화합물의 산화를 유도한다. 본 연구에서는 이러한 가설을 검증하기 위해 정전분무 공기청정기 시작품을 제작하여 서울 지하철역 플랫폼에 적용하여 성능을 평가하였다. 연구 결과 공기청정기 입출구 사이의 PM10, PM2.5, PM1.0의 집진효율은 각각 99.1, 98.7, 93.5%로 측정되었으며, 장시간 운전 결과 지하철 역사 내 미세먼지는 약 40% 가량 저감되는 것을 확인하였다. 또한, 공기청정기 입출구 사이의 총 부유세균은 99.9% 이상, 총 휘발성 유기화합물은 95% 이상 저감시키는 것을 확인하였다.
Photo-oxidation activities on Pd-doped TiO<sub>2</sub> nanoparticles: critical PdO formation effect
Lee, Hangil,Shin, Minjeong,Lee, Myungjin,Hwang, Yun Jeong Elsevier 2015 Applied Catalysis B Vol.165 No.-
<P><B>Abstract</B></P> <P>The catalytic activities of three distinct Pd-doped TiO<SUB>2</SUB> (PdTiO<SUB>2</SUB>) nanoparticle samples, post-annealed (at 700, 800, and 900°C) after fabrication on silicon substrates, were analyzed with respect to the photo-oxidation of aniline and 2-thiophenecarboxaldehyde. Through a combination of Raman spectroscopy and high-resolution photoemission spectroscopy (HRPES), we demonstrated that the photocatalytic oxidation occurred only when the PdTiO<SUB>2</SUB> nanoparticles were annealed at temperatures above 800°C, that is, when PdO and Ti<SUP>3+</SUP> had partially formed on the PdTiO<SUB>2</SUB> nanoparticles, which indicates that the presence of PdO and Ti<SUP>3+</SUP> is critical for the photocatalytic oxidation. Additionally, we determined the decrease in the band gaps to visible region with PdTiO<SUB>2</SUB> nanoparticles annealed above 800°C from their valence-band spectra, which resulted in photocatalytic activities even under visible light, <I>λ</I> =540nm.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Enhanced photocatalytic oxidation activity of PdTiO<SUB>2</SUB> nanoparticles with existence of PdO. </LI> <LI> PdO formation in PdTiO<SUB>2</SUB> nanoparticles by thermal annealing above 800°C. </LI> <LI> Capability for photo-oxidation of aniline and 2-thiophenecarboxaldehyde under visible light. </LI> <LI> Decrease of PdTiO<SUB>2</SUB> band gap to visible region (1.92eV) by thermal annealing at 900°C. </LI> </UL> </P>
Charge Trapping Memory Device Based on MoS₂ FET with CrPS₄
Minjeong Shin,Mi Jung Lee,Chansoo Yoon,Gwangtak Oh,Woohyeon Ryu,Sungmin Lee,Je-Geun Park,Bae Ho Park 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
Atomically thin two-dimensional (2D) materials have emerged as promising candidates for flexible and transparent electronic applications [1, 2]. Here, we introduce non-volatile charge trapping memory devices, based on the 2D heterostructure field-effect transistor consisting of a few-layer MoS<sub>2</sub> channel and CrPS4 charge-trapping gate stack. Clockwise hysteresis behaviors in transfer curves measured at room temperature show a strong dependence on the thickness of CrPS4, which are attributed to charge trapping at trap sites in the CrPS4 layers. Our heterostructure memory device with 75 nm-thick CrPS4 layer exhibits both large memory windows up to 99.7 V and a high on/off current ratio (3x10<sup>5</sup>) with good endurance during 625 cycles because of its excellent trapping ability of trap sites in the CrPS4. Especially, the memory window size can be effectively tuned from 7.6 V to 99.7 V by changing the sweep range of gate voltage. Such high performances of the charge trapping memory device with a simple heterostructure provide a promising route towards next-generation memory devices utilizing 2D materials.
In-situ formation of co particles encapsulated by graphene layers
Lee Minjeong,Kim Gyutae,Jeong Gyu Hyun,Yoon Aram,이종훈,Ryu Gyeong Hee 한국현미경학회 2022 Applied microscopy Vol.52 No.1
The process of encapsulating cobalt nanoparticles using a graphene layer is mainly direct pyrolysis. The encapsulation structure of hybrids prepared in this way improves the catalyst stability, which greatly reduces the leaching of non-metals and prevents metal nanoparticles from growing beyond a certain size. In this study, cobalt particles surrounded by graphene layers were formed by increasing the temperature in a transmission electron microscope, and they were analyzed using scanning transmission electron microscopy (STEM). Synthesized cobalt hydroxide nanosheets were used to obtain cobalt particles using an in-situ heating holder inside a TEM column. The cobalt nanoparticles are surrounded by layers of graphene, and the number of layers increases as the temperature increases. The interlayer spacing of the graphene layers was also investigated using atomic imaging. The success achieved in the encapsulation of metallic nanoparticles in graphene layers paves the way for the design of highly active and reusable heterogeneous catalysts for more challenging molecules.