Treatment of Hospital Wastewater by Biological Fluidized Bed

이민규,이회근,감상규,이동환,( Min Gyu Lee,Whae Geon Lee,Sang Kyu Kam,Dong Hwan Lee,Tadashi Hano ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3

Polysulfone에 Di-(2-ethylhexyl)-phosphoric acid와 Carbon Nanotubes를 고정화한 PSf/D2EHPA/CNTs 비드의 제조와 Sr(II)의 제거 특성

이민규 ( Min-gyu Lee ),윤종원 ( Jong-won Yun ),서정호 ( Jung-ho Suh ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.6

본 연구에서는 di-(2-ethylhexyl)-phosphoric acid (D2EHPA)와 carbon nanotubes (CNTs)를 polysulfone (PSf)에 고정화시켜 PSf/D2EHPA/CNTs 비드를 제조하였으며, 제조한 비드에 의한 Sr(II)의 제거특성을 살펴보았다. Scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FTIR) 및 Thermo gravimetric analysis (TGA) 분석을 통하여 PSf/D2EHPA/CNTs 비드의 형태적 특성들을 조사하였다. PSf/D2EHPA/CNTs 비드에 의한 Sr(II)의 제거는 운전시간 60 min 정도에서 평형에 도달하였으며, 속도 실험결과는 유사 2차 속도식에 잘 부합하는 것으로 나타났다. 또한 PSf/D2EHPA/CNTs 비드에 의한 Sr(II)의 제거에서 Langmuir 식으로부터 구한 최대 제거량은 4.75 mg/g이었다. PSf/D2EHPA/CNTs 비드에 의한 Sr(II)의 제거효율은 추출제 D2EHPA 만을 사용하는 경우보다 CNTs를 첨가함으로써 Sr(II)의 제거량이 2.5배 정도 향상되는 결과를 보였다. PSf/D2EHPA/CNTs beads were prepared by immobilizing extractant di-(2-ethylhexyl)- phosphoric acid (D2EHPA) and adsorbent carbon nanotubes (CNTs) on polysulfone (PSf), and the adsorption characteristics of Sr(II) on the beads were studied. The morphological characteristics of the prepared PSf/D2EHPA/CNTs beads were observed by scanning electron microscopy (SEM), thermo gravimetric analysis (TGA), and Fourier transform infrared spectrometer (FTIR). The equilibrium time for the removal of Sr(II) by PSf/D2EHPA/CNTs beads was 60 min. The experimental kinetic data followed pseudo-second-order model more than pseudo-first-order kinetics model. The maximum removal capacity of Sr(II) obtained from Langmuir isotherm was 4.75 mg/g. The removal efficiencies of Sr (II) by PSf/D2EHPA/CNTs beads were improved 2.5 times by adding the adsorbent CNTs more than by using only the extractant D2EHPA.

운동축을 삽입한 하이드록시아파타이트 안와삽입물에서 발생한 방선균증 2예

이민규,우경인,김윤덕.Min Gyu Lee. MD. Kyung In Woo. MD. PhD. Yoon Duck Kim. MD. PhD 대한안과학회 2014 대한안과학회지 Vol.55 No.5

Purpose: To report 2 cases of Actinomyces infection in a hydroxyapatite orbital implant with a motility peg. Case summary: A 44-year-old male and a 55-year-old male who underwent evisceration and implantation of a hydroxyapatite implant in the left eye 17 and 15 years prior, respectively, presented with a conjunctival sac granuloma with discharge and bleeding of 1 year duration. Both patients had a history of motility peg implantation. A large-area of the hydroxyapatite implant was exposed after removal of the granuloma. The previous orbital implant was removed, and the exposed area was covered with a dermis fat graft in both patients. On histopathological examination, <em>Actinomyces </em>infection in the orbital implant was observed in both patients. Conclusions: To the best of our knowledge, this is the first case report of actinomycosis of hydroxyapatite orbital implant in Korea. In a patient with a porous orbital implant, the possibility of Actinomyces infection of the orbital implant should be considered after a long-duration and large-area exposure of the implant. J Korean Ophthalmol Soc 2014;55(5):755-760

박스-벤켄 설계법을 이용한 폐감귤박 활성탄에 의한 수용액 중의 항생제 Trimethoprim의 흡착 연구

이민규,감상규,Lee, Min-Gyu,Kam, Sang-Kyu 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.4

폐감귤박으로 제조한 활성탄(WCAC, waste citrus peel based activated carbon)에 의한 항생제 trimethoprim (TMP)의 흡착 특성을 조사하기 위해 반응표면법(RSM, response surface methodology)을 사용하여 TMP 흡착에 대한 운전인자들의 영향을 조사하였다. 농도($X_1$: 50-150 mg/L), pH ($X_2$: 4-10), 온도($X_3$: 293-323 K), 흡착제 투여량($X_4$: 0.05-0.15 g)의 4가지 입력 파라미터를 가진 4-요인 Box-Behnken 실험 설계에 따라 회분식 실험을 수행하고, 얻어진 실험 결과를 다중 회귀 분석으로 2차 다항식에 맞추고 통계적 방법을 사용하여 검토하였다. 독립 변수 및 변수들 간의 교호 작용의 유의성은 ANOVA 및 t-검정 통계기법으로 평가하였으며, 통계적 결과는 TMP 농도가 다른 요인들에 비하여 가장 많은 영향을 미치는 운전인자라는 것을 보여 주었다. 흡착공정은 유사 2차 속도식에 잘 부합하였으며, 등온흡착평형관계는 Langmuir 식이 Freundlich 식 보다 잘 부합하였다. Langmuir 등온식으로 부터 계산한 WCAC에 의한 TMP의 최대 흡착량은 293 K에서 144.9 mg/g이었다. In order to investigate the adsorption characteristics of the antibiotics trimethoprim (TMP) by activated carbon (WCAC) prepared from waste citrus peel, the effects of operating parameters on the TMP adsorption were investigated by using a response surface methodology (RSM). Batch experiments were carried out according to a four-factor Box-Behnken experimental design with four input parameters : concentration ($X_1$: 50-150 mg/L), pH ($X_2$: 4-10), temperature ($X_3$: 293-323 K), adsorbent dose ($X_4$: 0.05-0.15 g). The experimental data were fitted to a second-order polynomial equation by the multiple regression analysis and examined using statistical methods. The significance of the independent variables and their interactions was assessed by ANOVA and t-test statistical techniques. Statistical results showed that concentration of TMP was the most effective parameter in comparison with others. The adsorption process can be well described by the pseudo-second order kinetic model. The experimental data of isotherm followed the Langmuir isotherm model. The maximum adsorption amount of TMP by WCAC calculated from the Langmuir isotherm model was 144.9 mg/g at 293 K.

대학생들이 바라 본 산업재산권의 중요성

이민규,정종훈,박종호,Lee, Min-Gyu,Jeong, Jong-Hun,Park, Jong-Ho 한국발명진흥회 2007 發明特許 Vol.32 No.12

포말 분리법을 이용한 양어장 순환수 처리 -1. Protein 분리특성-

서근학 ( Kuen Hack Suh ),이민규 ( Min Gyu Lee ) 한국수산학회 1995 한국수산과학회지 Vol.28 No.5

포말 분리관에 단백질 용액을 일정하게 공급하여 분리 실험을 수행하며 초기 단백질 농도, 공탑 공기 유속, 온도와 pH 등의 영향에 따른 포말 분리관의 단백질 분리특성을 연구한 결과, 액본체 단백질의 약 65% 이상이 약 l0 min이내에 제거되는 효과적인 분리특성을 나타내어 포말분리법은 양어장 순환수중의 주된 유기성분인 단백질을 분리하기 위한 매우 효과적인 방법이었다. 액본체 중의 단백질의 초기농도가 증가함에 따라 단백질 제거속도는 일정 농도 이하의 조건에서는 직선적으로 증가하다가 일정한 값을 유지하여 단백질 제거속도는 Langmuir 홉착형태를 나타내었으며, 제거속도는 공탑 공기유속에 대해서는 직선관계를 보였다. 본 실험조건 범위 내에서는 단백질 제거에 있어 온도 및 pH의 영향은 그다지 크지 않는 것으로 나타났으며, 실험결과를 검토한 결과 이론식은 타당하였다. The feasibility of foam separation to remove protein produced from fish culture water was investigated. By assuming foam separation column as a single well-mixed pool, a simplified model for foam separator conditions was also studied under the batch operation. The model indicated that the protein removal could be described as a first-order reaction whose rate increases with both superficial air velocity and protein concentration in the bulk solution. From the results of an experimental study on the effects of superficial air velocity, the protein concentration, temperature, and pH on protein removal, the superficial air velocity and initial protein concentration in bulk solution were found to be important operational factors. Other experimental results indicated that foam separator operated under batch conditions would be considered as a completely mixed reactor. The protein removal rate by foam separation process was increased proportionally with the superficial air velocity, and the adsorptive removal rate of protein was found to obey Langmuir adsorption formula. The proposed simplified model was verified with the experimental data obtained from this study. Under the experimental range used, both temperature and pH did not affect the protein removal.

석탄비산재로 합성한 Na-A 제올라이트의 Ca²⁺와 Mg²⁺ 이온교환 성능평가

이창한 ( Chang-han Lee ),이민규 ( Min-gyu Lee ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.11

In this study, zeolite (Z-C1) was synthesized using a fusion/hydrothermal method from coal fly ash. The morphological structures of Z-C1 were confirmed to be highly crystalline with a cubic crystal structure. Exchange capacities of Ca²⁺ and Mg²⁺ ions in a single and a mixed solution reached equilibrium within 120 min. The exchange kinetics of these ions were well predicted by the pseudo-second-order rate equation. The exchange isotherms of the Ca²⁺ and Mg²⁺ ions matched the Langmuir isotherm better than the Freundlich isotherm. The maximum cation exchange capacities (q_m) obtained by the Langmuir isotherm model were 2.11 mmol/g (84.52 mg/L) and 1.13 mmol/g (27.39 mg/L) for the Ca²⁺ and Mg²⁺ ions, respectively.

제올라이트를 PVA로 고정화한 흡착제에 의한 Cs과 Sr 이온 제거

이창한(Chang Han Lee),이민규(Min Gyu Lee) 大韓環境工學會 2015 대한환경공학회지 Vol.37 No.8

본 연구에서는 제올라이트를 PVA에 고정화시켜 새로운 흡착제인 PVA-Zeolite 비드를 제조하고, XRD 및 SEM 분석을 통해 제조한 PVA-Zeolite 비드는 내부에 제올라이트가 잘 고정화된 다공성 구조를 가지고 있는 것을 확인할 수 있었다. 제조한 흡착제에 의한 Cs 이온과 Sr 이온에 대한 흡착특성을 살펴보기 위하여 pH의 영향, 흡착속도, 흡착등온을 검토하였다. Sr 및 Cs 이온에 대한 평형흡착시간은 약 540 min으로 나타났으며, 흡착속도는 유사 1차 속도식 보다는 유사 2차 속도식에 더 잘 부합하였다. 흡착평형 실험결과는 Langmuir 등온식에 잘 적용되었으며, Langmuir 등온식으로부터 구한 Sr 이온과 Cs이온의 최대 흡착량은 각각 52.08 mg/g와 58.14 mg/g이었다. PVA-Zeolite 비드에 의한 Sr 이온과 Cs 이온의 흡착공정은 외부물질전달단계는 매우 빠르게 이루어지며, 내부입자확산에 의한 흡착반응은 느리게 진행되어 내부입자확산 단계가 흡착속도 결정단계인 것으로 판단된다. In this research a adsorbent, PVA-Zeolite bead, was prepared by immobilizing zeolite with PVA. The results of XRD and SEM analysis showed that the prepared PVA-Zeolite beads had porous structure and the zeolite particles were in mobilized within the internal matrix of the beads. The adsorption properties of Sr ion and Cs ion with the adsorbent were studied by different parameters such as effect of pH, adsorption rate, and adsorption isotherm. The adsorption of Sr ion and Cs ion reached equilibrium after 540 minutes. The adsorption kinetics of both ions by the PVA-Zeolite beads were fitted well by the pseudo-second-order model more than pseudo-first-order model. The equilibrium data fitted well with Langmuir isotherm model. The maximum adsorption capacities of Sr ion and Cs ion calculated from Langmuir isotherm model were 52.08 mg/g and 58.14 mg/g, respectively. The external mass transfer step was very fast compared to the intra-particle diffusion step in the adsorption process of Cs ion and Srion by the PVA-Zeolite beads. This result implied that the rate controlling step was the intra-particle diffusion step.

인지 무선 네트워크 환경에서 D-OFDM을 이용한 MAC 프로토콜

이민규(Min-Gyu Lee),이태진(Tae-Jin Lee) 한국통신학회 2010 한국통신학회 학술대회논문집 Vol.2010 No.6

IoT 기반 사무실 자동관리 시스템

이민규(Min-Gyu Lee),김민규(Min-Kyu Kim),최한수(Han-Su Choi),이주완(Joo-Wan Lee),김소현(So-Hyun Kim),김황래(Hwang-Rae Kim) 한국정보기술학회 2020 Proceedings of KIIT Conference Vol.2020 No.10