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Preparation and Characterization of Small Sized PZT Powders
Choi, Kyu-Man(최규만),Lee, Hae-Chun(이해춘) 한국정보전자통신기술학회 2008 한국정보전자통신기술학회논문지 Vol.1 No.2
A current research basically diverted towards an increase in the operational output with the minimization of the materials used, which ultimately scaled down the dimensions of ceramic electronic components. In this direction the nano-technology pave the revolutionary changes in particular the electronic industries. The applications of nano-sized particles or nano-sized materials are hence, playing a significant role for various purposes. The PZT(lead, zirconium, titanium) based ceramics which, are reported to be ferroelectric materials have their important applications in the areas of surface acoustic waves (SAW), filters, infrared detectors, actuators, ferroelectric random access memory, speakers, electronic switches etc. Moreover, these PZT materials possess the large electro mechanical coupling factor, large spontaneous polarization, low dielectric loss and low internal stress etc. Hence, keeping in view the unique properties of PZT piezoelectric ceramics we also tried to synthesize indigenously the small sized PZT ceramic powder in the laboratory by using the modified sol-gel approach. In this paper, propyl alcohol based sol-gel method was used for preparation of PZT piezoelectric ceramic. The powder obtained by this sol-gel process was calcined and sintering to reach a pyrochlore-free crystal phase. The characterization of synthesized material was carried out by the XRD analysis and the surface morphology was determined by high resolution scanning electron microscopy.
최규만(Choi, kyu-man),이윤식(Lee, yun-sik) 한국정보전자통신기술학회 2009 한국정보전자통신기술학회논문지 Vol.2 No.3
심층수를 음용수화 하는 것은 심층수에 포함되어 있는 붕소 때문에 크게 제약을 받고있다. 붕소는 사람과 식물에게 유독한 것으로 보고되고 있다. 이러한 붕소를 제거하는 유용한 방법이 몇 가지 있는데, 본 논문에서는 해수에 포함된 붕소를 제거하기 위한 붕소제거제를 폴리머 레진 형태로 합성 하였다. 합성된 레진을 IR분석을 통해 특성을 분석하였고, SEM을 이용하여 그 표면을 관찰하였다. 붕소제거능력을 평가하기 위해 레진을 직경이 0.25mm, 0.5mm 및 1.0mm가 되도록 구분하여 준비하고 베치방식의 실험을 통해 그 결과를 관찰했다. The use of deep water as drinking water is greatly limited of significant concentration of boron in sea water. Boron is reported to be toxic for human and plants. Some of possible methods are available to remove boron. The polymeric resins were synthesized to remove the boron from the sea water. The resin was characterized with IR analysis and the morphology was discussed with SEM images. To assess boron removal capacity of the resin, it was distributed in three different bead size i.e., 0.25mm, 0.5mm and 1.0mm. The removal behavior of this resin was examined under the batch experiments.
최규만(Kyu-Man Choi),이승목(Seung-Mok Lee),이윤식(Yun-Sik Lee),이상훈(Sang-Hun Lee) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
The resin that can be used as the sorbent to eliminate boron in the deep sea water was fabricated. Cellulose fiber(CF), Glycidyl methacrylate(GMA), Sodiumn-dodecyl sulfate(SDS), aqueous hydrogen peroxide and aqueous thiourea dioxide have been prepared and used as support. This support was reacted with vinyl monomer and N-methylglucamin.. The resulting resin was such an efficient sorbent to eliminate boron that the resin showed reasonably good sorption ability. By appling this resin to the deep sea water, boron concentration changed from 5.631ppm (before) to 3.477ppm(after)
보강재 길이에 따른 모형 보강토 옹벽의 거동에 관한 연구
최규리(Kyu-Lee Choi),오성실(Sung-Sil Oh),이석원(Seok-Won Lee),노기돈(Gi-don No),박보형(Bo-Hyeong Park),김진용(Jin-Yong Kim),안준(June An),최성룡(Seong-Ryong Choi),원명수(Myung-Soo Won) 한국지반신소재학회 2013 한국지반신소재학회 학술발표회 Vol.2013 No.11
A serious of test were conducted to examine the effects of the reinforcement length to the geosynthetic reinforced soil (GRS) wall models. The strength for the GRS wall with increased reinforcement length was improved. The failure in GRS wall models shows ductile behavior however the failure in unreinforced wall model shows inelastic behavior.
Design and analysis of the lens converting the spot light into the line light
Choi, Kyu-Man(최규만),Lee, Hae-Chun(이해춘) 한국정보전자통신기술학회 2008 한국정보전자통신기술학회논문지 Vol.1 No.2
A CCFL which commonly used in the back light units for the LCD, possess very high brightness hence, was widely used as a line light source. However, the use of CCFL, caused for several environmental concerns since it contain highly toxic mercury, gradually replaced into a LED. But the LED is a spot light source, the dark area occurs in the surface of the back light units. In this paper, we proposed the lens that can convert the spot light into the line light and it can remove the dark area in the surface of the back light units. The lens is composed with the light condensation part and the light guiding part. The conditions obtained will be helpful to plan an optimum structure for such preparation.
글리포세이트 중독 환자에서 급성 신손상 발생의 임상 양상과 위험 인자
박형훈 ( Hyung Hun Park ),최규일 ( Kyu Ill Choi ),이제원 ( Je Won Lee ),박정민 ( Jung Min Park ),박진욱 ( Jinwook Park ),노상문 ( Sang Moon Noh ),조재경 ( Jaekyung Cho ),이대로 ( Daero Lee ),조재철 ( Jae Chul Cho ),박동찬 ( Dong C 대한임상독성학회 2020 대한임상독성학회지 Vol.18 No.2
Purpose: Acute kidney injury (AKI) in patients with glyphosate poisoning has a poor prognosis. This study aimed to predict the risk factors for AKI in patients with glyphosate poisoning at the emergency department (ED). Methods: Clinical data on glyphosate poisoning patients at ED who were older than 18 years were collected retrospectively between January 2013 and December 2019. The clinical characteristics and clinical outcomes of the AKI group in patients with glyphosate poisoning were compared with the non-AKI (NAKI) group. Results: Of 63 glyphosate poisoning patients, AKI was observed in 15 (23.8%). The AKI patients group showed the following: old age (p=0.038), low systolic blood pressure (p=0.021), large amount of ingestion (p=0.026), delayed hospital visits (p=0.009), high white blood cells (WBC) (p<0.001), high neutrophil counts (p<0.001), high neutrophil-lymphocyte (LN) ratios (p<0.001), high serum potassium (p=0.005), low arterial blood pH (p=0.015), and low pO2 (p=0.021), low bicarbonate (p=0.009), and high Poisoning Severity Score (PSS) (p<0.001). AKI patients required hemodialysis, ventilator care (p<0.001, p=0.002), and inotropics (p<0.001). They also showed more intensive care unit admission (p<0.001), longer hospitalization (p<0.001), and high mortality (p<0.001). Logistic multivariate regression analysis showed that high WBCs (OR, 1.223) and increased LN ratios (OR, 1.414) were independently associated with the occurrence of AKI. Conclusion: In patients with glyphosate poisoning at ED, high WBCs and increased LN ratios can help predict the occurrence of AKI.
기저층 및 열처리 효과가 Co / Cu 다층박막의 자기저항에 미치는 영향
김미양(Mee-Yang Kim),최규리(Kyu-Lee Choi),최수정(Soo-Jung Choi),송은영(Eun-Young Shong),이장로(Jang-Roh Rhee),황도근(Do-Guwn Hwang),이상석(Sang-Suk Lee),박창만(Chang-Man Park),이기암(Ky-Am Lee) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.2
Dependence of magnetoresistance on the thickness of Cu, type and thickness of buffer layer, and the stacking number of multilayer in the form buffer /[Co(17Å)/Cu(tÅ)]_(20) were investigated. To evaluate effect of annealing on this samples, X-ray diffraction analysis, vibrating sample magnetometer analysis, and magnetoresistance measurement(4-probe method) were performed. The magnetoresistance ratio exhibits a maximum of 21% for the multilayer with Cu thickness of 24Å and Fe buffer layer thickness of 50Å. Deposition of film under low base pressure induces in increase magnetoresistance ratio by preventing oxidation. The multilayer annealed below 300℃ temperature allowed larger textured grain without loss in the periodicity. Magnetoresistance ratios of the multilayer with Cu thickness of 24Å and 36Å were increased due to the increase in the antiferromagnetically coupled fraction after annealing.