Impact of Irradiation Time on the Hydrolysis of Waste Activated Sludge by the Dielectric Heating of Microwave

Tae Joo Park,Im Gyu Byun,Jae Ho Lee,Ji Sung Lim,Jeong Min Lee 대한환경공학회 2014 Environmental Engineering Research Vol.19 No.1

The effects of initial solid concentration and microwave irradiation (MWI) time on the hydrolysis of waste activated sludge (WAS)were investigated. MWI time strongly influenced WAS hydrolysis for all initial solid concentrations of 8.20, 31.51, and 52.88 g VSS/L. For all WAS, the volatile suspended solids (VSS) solubilization degree ranged from 35.6% to 38.4% during a total MWI time of 10 min. Solublechemical oxygen demand (SCOD) concentration increased at a rate proportional to the decrease of VSS during the MWI. However, the clearly different VSS solubilization patterns that were observed during the MWI were explained by the 2-step hydrolysis of WAS, consisting of the initial disintegration of the easily degradable part of the sludge, followed by the subsequent disintegration of the hardlydegradable part of the sludge. WAS hydrolysis rates for 3 to 6 min of MWI were significantly lower than those for less than 3 min, or more than 6 min. From these results, 3 min MWI time and WAS of 31.51 g VSS/L (centrifugal thickener WAS) showed the most efficienthydrolysis of WAS at 36.0%. The profiles of total nitrogen (T-N) concentrations corresponded well to the SCOD increases in terms of the empirical formula of bacterial cell mass (C5H7O₂N). The negligible T-N increase and pH decrease during WAS hydrolysis by MWI will allowthe application of this process to subsequent biological processes, such as anaerobic digestion.

고정층 활성탄 흡착반응기에서 기상 톨루엔의 흡착특성

임진관,이송우,감상규,이동환,이민규 한국환경과학회 2005 한국환경과학회지 Vol.14 No.1

Adsorption characteristics of toluene vapor, which is one of important source of volatile organic compounds (VOCs), by activated carbon were investigated using a fixed bed adsorption column. The operating parameters such as breakthrough curve, adsorption capacity. mass transfer zone (MTZ), and length of unused bed (LUB) were studied. The experimental results showed that the breakthrough time decreased with increasing inlet toluene concentration and gas flow rate. MTZ and LUB increased with the increase of inlet concentration, gas flow rate, and particle size of activated carbon. The adsorption capacity increased with the increase of inlet toluene concentration, while it decreased with increasing particle size. However, it was kept at constant value regardless of the increase of gas flow rate. Adsorption isotherm of toluene vapor could be represented by the Freundlich adsorption equation fairly well. From the adsorption experiments using some VOC gases such as toluene, xylene, butyl acetate. butanol and acetone, it was also found that the adsorption capacity was higher in the case of gas with higher boiling point and lower vapor pressure.

치매환자를 위한 어플리케이션에 대한 연구

이철민(Lee Chul?min),임병규(Lim Boung-gyu),송은지(Song Eun-jee) 한국정보기술학회 2018 Proceedings of KIIT Conference Vol.2018 No.11

Unexpected pulmonary edema and cardiac arrest following wedge resection of spontaneous pneumothorax -A case report-

Han Woong,Kim Gyu Seong,Lee Jong Min,Lim Chang Mook,Yang Hong Seuk,Jeong Chang Yeong,박동호 대한마취통증의학회 2022 Anesthesia and pain medicine Vol.17 No.3

BackgroundReexpansion pulmonary edema is a rare but potentially lethal complication. We report a case of suspected reexpansion pulmonary edema that led to cardiac arrest.CaseA 16-year-old male patient underwent wedge resection due to right pneumothorax. The patient showed pink frothy sputum three hours following surgery, and a chest x-ray showed right unilateral pulmonary edema. Thirteen hours following surgery, the patient continuously showed pink frothy sputum and presented with severe hypoxemia, tachypnea, and tachycardia. After transferring to the intensive care unit (ICU), he developed ventricular tachycardia. Cardiopulmonary resuscitation was performed for 32 min. Chest X-ray showed diffuse bilateral pulmonary edema. Extracorporeal membrane oxygenation was performed. During the 65 days of ICU care, the patient became mentally alert. However, follow-up echocardiography revealed severe heart failure.ConclusionsRexpansion pulmonary edema can rapidly progress to diffuse bilateral pulmonary edema. Therefore, careful observation is required for the patients who show signs of pulmonary edema after reexpansion.

활성탄/플리우레탄 복합담체를 충전한 바이오필터에서 H₂S의 제거특성

감상규,강경호,임진관,이민규 한국환경과학회 2004 한국환경과학회지 Vol.13 No.1

A biofiltration system using activated carbon/polyurethane composite as solid support inoculated with Bacillus sp. was developed for treating a gaseous stream containing high concentrations of H₂S. The effects of operating condition such as the influent H₂S concentration and the empty bed contact time (EBCT) on the removal efficiency of H₂S were investigated. The biofilter showed the stable removal efficiencies of over 99 % under the EBCT range from 15 to 60 sec at the 300 ppmv of H₂S inlet concentration. When the inlet concentration of H₂S was increased, the removal efficiencies decreased, reaching 95 and 74%, at EBCTs of 10 and 7.5 sec, respectively. The maximum elimination capacity in the biofilter packed with activated carbon/polyurethane composite media was 157 g/m³/hr.

A Proteomics Approach for the Identification of Valuable Antibodies from Human Serum

Gyu-Min LIM,Hee-Jin JEONG,Byung-Gee KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.4

S-524 : An interactive smart-phone based action plan for asthma management

( Min Gyu Kang ),( Kyung Hwan Lim ),( Sae Hoon Kim ),( Sang Heon Cho ),( Kyung Up Min ),( Ki Hwan Ahn ),( Yoon Seok Chang ) 대한내과학회 2013 대한내과학회 추계학술대회 Vol.2013 No.1

Background: Written action plans is important for better asthma control. But it is not easy to follow action plan in real life, especially in acute exacerbation. Many people including the elderly are using smartphone more and more: “anytime, anywhere”. We evaluated the usefulness of asthma self-management using an interactive smart-phone based action plan. Methods: Seventy adult asthma patients were enrolled prospectively between November 2012 and February 2013. Patients input their daily asthma symptoms and peak expiratory flow rate on the smart-phone application and instantly received feedback on asthma control status according to an asthma action plan. After 3 months periods of smart-phone guided self-management, we evaluated lung function, Asthma Control Test (ACT) score, Quality of Life Questionnaire for Adult Korean Asthmatics (QLQAKA) score and user`s satisfaction for the smart-phone application. Results: Total 3669 signals generated for 12 weeks and half of the patients (49.2%) used the smart-phone application at least once a day. After 3 months of study, FEV1 (91,6±20.6 vs. 87.3±18.0, p=0.002), ACT score (22.2±2.7 vs. 20.2±4.7, p<0.001), QLQAKA score (72.8±11.4 vs. 67.4±12.3, p<0.001) and medication adherence (94.1±10.1 vs. 86.0±18.1, p=0.001) were significantly improved. Total 22 of risky or dangerous signals in 19 patients (32.2%) were detected and investigators contacted the patients instantaneously by telephone. Among them, two patients were referred to emergency department. The mean satisfaction score for smart-phone guided self-management was excellent (4.0±0.6, range: 1.0-5.0). Conclusion: In real life, the interactive smart-phone based action plan was helpful in managing asthma and especially in acute asthma exacerbations.

S-586 Predictive factors of survival benefit from rechallenging chemotherapy in advanced NSCLC

( Gyu Min Lim ),( Hye Sook Kim ) 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1

Objective: Salvage treatment for relapsed non small cell lung cancer remains unsatisfactory despite of development of new agents. Approximately, 10% of patients have an intervaltime after concluding first-line platinum-based chemotherapygreater than 6 months. These patients may achieve hightumor responses when the same regimen is again used in second-linetreatment.We conducted retrospectivestudy of rechallenging cytotoxic chemotherapy. Methods: Patients with advanced/metastatic non-small cell lung cancer who had achieved disease control with initial cytotoxic treatment, followed by rechallenge with the same chemotjerapeutic agents upon disease progression were included. Results: In total, thirty-five patients were included during the period from 2007 to 2013at National Cancer Center.Readministered regimens were consisted with either platinum doublets (pemetrexed plus platinum, gemcitabine plus platinum, or irinotecan plus platinum), or taxane (docetaxel). After the rechallenge, 5 patients (16.1%) achieved partial remission (PR), 17 (54.8%) achieved stable disease (SD) and 9 (29.1%) experienced progressive disease. The treatment was generally well tolerated, with a low rate of toxicity. The median progression free survival (PFS) was 4.2 months with the rechallenge. Patients with a PFS of ≥6 months with initial treatment exhibited longer PFS and overall survival (OS) with the rechallenge compared to those with a PFS of <6 months with initial treatment free interval (PFS: 5.2±0.1 vs. 4.8±0.2 months, respectively; p=0.041; and OS, 37.3±7.2 vs. 18.8±2.1 months, respectively; p=0.005). The time from the termination of initial PBC to disease progression was also associated with survival after the rechallenge. However, the response to initial chemotherapy (CR+PR vs. SD) and the time from the termination of initial treatment to disease progressiondid not affect PFS after the rechallenge. Conclusions: Our results demonstrated that rechallenge with chemotherapy was well tolerated and survival after the rechallenge was asso￢ciated with survival during initial chemotherapy. Therefore, rechallenging chemotherapy represents a usefultherapeutic option for selected patients.

Development of stability maps for flashing-induced instability in a passive containment cooling system for iPOWER

Lim, Sang Gyu,No, Hee Cheon,Lee, Sang Won,Kim, Han Gon,Cheon, Jong,Lee, Jae Min,Ohk, Seung Min Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.1

A passive containment cooling system (PCCS) has been developed as advanced safety feature for innovative power reactor (iPOWER). Passive systems are inherently less stable than active systems and the PCCS encountered the flashing-induced instability previously identified. The objective of this study is to develop stability maps for flashing-induced instability using MARS (Multi-dimensional Analysis of Reactor Safety) code. Firstly, we conducted a series of sensitivity analysis to see the effects of time step size, nodalization, and alternative MARS user options on the onset of flashing-induced instability. The riser nodalization strongly affects the prediction of flashing in a long riser of the PCCS, while time step size and alternative user options do not. Based on the sensitivity analysis, a standard input and an analysis methodology were set up to develop the stability maps of PCCS. We found out that the calculated equilibrium quality at the exit of the riser as a stability boundary above 5 kW/㎡ was approximately 1.2%, which was in good agreement with Furuya's results. However, in case of a very low heat flux condition, the onset of instability occurred at the lower equilibrium quality. In addition, it was confirmed that inlet throttling reduces the unstable region.

Comparison of Clinical Outcomes among Conventional Scleral Fixation, Retropupillary Iris-claw Intraocular Lens Implantation, and Intrascleral Fixation

Min-Ji Kim(Min-Ji Kim),Gyu Le Han(Gyu Le Han),Tae-Young Chung(Tae-Young Chung),Dong Hui Lim(Dong Hui Lim) 대한안과학회 2022 Korean Journal of Ophthalmology Vol.36 No.5

Purpose: To compare the efficacy and safety of conventional scleral fixation (C-SF), retropupillary iris-claw intraocular lens (RP-IOL) implantation, and intrascleral fixation (ISF). Methods: This retrospective observational study included 58 patients (58 eyes) who underwent C-SF (23 eyes), RP-IOL (23 eyes), and ISF (12 eyes) by a single surgeon at Samsung Medical Center from October 2017 to July 2020 and were followed up for at least 6 months. This study analyzed various clinical outcomes before surgery, and 1 day, 1 week, 1 month, 3 months, and 6 months after surgery. Results: Six months after surgery, best-corrected visual acuity in logarithm of minimum angle of resolution was 0.08 ± 0.10, 0.08 ± 0.16, and 0.03 ± 0.04 in C-SF group, RP-IOL group, and ISF group, respectively, and there was a significant improvement in each group compared to preoperative best-corrected visual acuity. All groups showed a significant increase in astigmatism postoperatively, but no between-group differences were observed. The prediction error was -0.15 ± 0.77, 0.56 ± 0.62, and 0.44 ± 1.00 diopters in the three groups, respectively, indicating RP-IOL group and ISF group for hyperopic shift. The three groups did not differ in terms of absolute prediction error. Six months after surgery, the corneal endothelial cell counts were 2,073 ± 691, 2,014 ± 692, and 1,712 ± 891 cells/mm2, respectively, which were lower than before surgery. IOL dislocation occurred in five eyes only in RP-IOL group, two of which underwent two reoperations, and reenclavation was performed smoothly without complications in all cases. Conclusions: Although the frequency of IOL dislocation in RP-IOL group was higher than that in the other groups, it can be reenclavated relatively easily. As a method of secondary IOL fixation, both RP-IOL implantation and ISF were as effective as conventional scleral fixation.