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다공성실리콘내 Fe3O4 나노입자의 압력침착과 채움밀도 모니터링 방법
이주현 ( Joo Hyeon Lee ),이재준 ( Jae Joon Lee ),이기원 ( Ki Won Lee ) 한국센서학회 2015 센서학회지 Vol.24 No.6
In this paper, we propose a new method to infiltrate Fe3O4-nanoparticles into a porous silicon film and a monitoring technique to detect packing density of nanoparticles within the film. Recently, research to use porous silicon as a drug carrier or a new functional sensor material by infiltrating Fe3O4-nanoparticles has been extensively performed. However, it is still necessary to enhance the packing density and to develop a monitoring technique to detect the packing density in real time. In this light, we forcibly injected a nanoparticle solution into a rugate-structured free-standing porous silicon (FPS) film by applying a pressure difference between the two sides of the film. We found that the packing density by the pressure-infiltration method proposed in this paper is enhanced, relative to that by the previous diffusion method. Moreover, a continuous shift in wavelength of the rugate reflectance peak measured from the film surface was observed while the nanoparticle solution was being injected. By exploiting this phenomenon, we could qualitatively monitor the packing density of Fe3O4-nanoparticles within the FPS film with the injection volume of the nanoparticle solution.
이주현(Joo-Hyeon Lee),이철웅(Chul-Ung Lee) 한국컴퓨터정보학회 2014 韓國컴퓨터情報學會論文誌 Vol.19 No.2
본 논문에서는 "Co-word" 특허분석방법과 "기술로드맵(technique road-map)" 그리고 특허활성화 라이프 사이클그래프 및 추세분석을 활용하여 ITS(Intelligent Transportation System)의 미래녹색기술에 대해 예측한다. 분석 결과 미래의 ITS 녹색 기술 분야의 발달로 탄소배출 절감 효과가 발생하기 때문에 환경 보호에 도움을 줄 것으로 예측 되었으며, 미래의 ITS 녹색 기술은 fuel saving 분야에 대한 성장이 클 것으로 예상되었다. 또한 fuel saving 분야는 미래의 IT 기술과의 융합으로 인해 더욱 실용적인 기술 분야로 발전할 수 있을 것으로 예측 되었다. In this paper, it predicts green technology in the future with "Co-word" which is patent analysis, "technology road-map, life cycle graph of patent activation and trend analysis. Analysis result shows that it would help environment preservation because development of ITS green technology makes carbon emission effectiveness and ITS green technology is especially expected to develop in fuel saving field. In addition, fuel saving field is predicted to be advance more practically technology field with convergence with IT.
이주현 ( Joo Hyeon Lee ),최지우 ( Jiu Choi ),김상민 ( Sang Min Kim ) 한국농공학회 2023 한국농공학회 학술대회초록집 Vol.2023 No.0
4대강의 수질 개선과 수생태계의 자연성 회복을 목적으로 낙동강, 금강 및 영산강의 9개 보 수문이 개방되었다. 보 수위저하 과정중 상류지역 일부 수막재배 농경지에서 지하수 취수량 감소 또는 이용 장애로 인한 농작물 피해가 발생하였다. 본 연구에서는 4대강 보 개방으로 인한 지하수의 영향을 분석하기 위해 낙동강 유역의 합천창녕보와 창녕함안보와 인근에 위치한 지하수 관측자료(2017년1월~2023년8월)를 수집하여 분석하였다. 합천창녕보 상류에 위치한 2개 지점, 합천창녕보와 창녕함안보 사이에 위치한 5개 지점, 창녕함안보 하류에 위치한 1개 지점의 지하수 변화를 고찰하였다. 두 보의 사이에 위치한 5개 지점중 4개 지점은 보가 개방될 때 지하수 수위가 저하되는 경향을 보였으며, 나머지 한 지점은 합천창녕보와 창녕함안보의 중간에 위치하여 상류측 보가 개방되었을 때 일시적으로 지하수 수위가 최소 1m에서 최대 3m까지 상승했다가 하류측 보가 개방되면 다시 하강하는 양상을 보였다.
웨어러블 심전도 측정과 임상 심전도 측정과의 상관관계에 대한 연구
이강휘(Kang-Hwi Lee),이성수(Seong-Su Lee),김상민(Sang-Min Kim),이혁재(Hyeok-Jae Lee),민경진(Kyoung-Jin Min),강현규(Hyun-Kyu Kang),이주현(Joo-Hyeon Lee),곽휘권(Hwy-Kuen Kwak),고윤수(Yun-Soo Ko),이정환(Jeong-Whan Lee) 대한전기학회 2018 전기학회논문지 Vol.67 No.12
Recent advances in ICT technology have transformed many of our daily lives and attracted a lot of attention to personal health. Heart beat measurement that reflects cardiac activities has been used in various fields such as exercise evaluation and psychological state evaluation for a long time, but its utilization method is limited due to its differentiation from clinical electrocardiogram. Therefore, in this study, we could observe the change of the measured signal according to the change of the distance and the position of the measuring electrodes which are non-standard electrode configuration. Based on the electric dipole model of the heart, correlation with clinical electrocardiogram could be confirmed by synthesizing multiple surface potentials measured with a shorter electrode distance than standard one. From the electromagnetic point of view, the distance between the measuring electrodes corresponds to the distance that the electric potential by the cardiac electric dipole moves, and the electric potential measured at the body surface is proportional to the moving distance of the electric potential. Therefore, it is preferable to make the distance between electrodes as long as possible, and to position the measuring electrode close to the ventricle rather than the atrium. In addition, it was found that standard electrocardiographic waveforms could be synthesized by using arithmetic sum of multiple measuring electrodes due to the relationship of electrical dipole vectors, which is obtained by dividing and positioning a plurality of measuring electrodes on a reference electrode line, such as Lead-I, Lead-II direction. Also, we obtained a significant Pearson correlation coefficient (r = 0.9113 ± 0.0169) as a result of synthetic experiments on four subjects.
SiH<sub>2</sub>Cl<sub>2</sub> 와 O<sub>3</sub>을 이용한 원자층 증착법에 의해 제조된 실리콘 산화막의 특성
이원준,이주현,한창희,김운중,이연승,나사균,Lee Won-Jun,Lee Joo-Hyeon,Han Chang-Hee,Kim Un-Jung,Lee Youn-Seung,Rha Sa-Kyun 한국재료학회 2004 한국재료학회지 Vol.14 No.2
Silicon dioxide thin films were deposited on p-type Si (100) substrates by atomic layer deposition (ALD) method using alternating exposures of $SiH_2$$Cl_2$ and $O_3$ at $300^{\circ}C$. $O_3$ was generated by corona discharge inside the delivery line of $O_2$. The oxide film was deposited mainly from $O_3$ not from $O_2$, because the deposited film was not observed without corona discharge under the same process conditions. The growth rate of the deposited films increased linearly with increasing the exposures of $SiH_2$$Cl_2$ and $O_3$ simultaneously, and was saturated at approximately 0.35 nm/cycle with the reactant exposures over $3.6 ${\times}$ 10^{9}$ /L. At a fixed $SiH_2$$Cl_2$ exposure of $1.2 ${\times}$ 10^{9}$L, growth rate increased with $O_3$ exposure and was saturated at approximately 0.28 nm/cycle with $O_3$ exposures over$ 2.4 ${\times}$ 10^{9}$ L. The composition of the deposited film also varied with the exposure of $O_3$. The [O]/[Si] ratio gradually increased up to 2 with increasing the exposure of $O_3$. Finally, the characteristics of ALD films were compared with those of the silicon oxide films deposited by conventional chemical vapor deposition (CVD) methods. The silicon oxide film prepared by ALD at $300^{\circ}C$ showed better stoichiometry and wet etch rate than those of the silicon oxide films deposited by low-pressure CVD (LPCVD) and atmospheric-pressure CVD (APCVD) at the deposition temperatures ranging from 400 to $800^{\circ}C$.