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질산암모늄을 이용한 이산화탄소 흡수, 칼슘 이온 추출 및 침강성 탄산칼슘 생성이 가능한 연속 공정
이민구,강동우,유윤성,이상엽,박진원 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2016 No.-
산업화의 가속으로 인하여 이산화탄소의 방출량은 전세계적으로 증가하고 있으며, 이는 지구온난화 및 이로 인한 기후변화의 잠재적 원인으로 지목되고 있다. 산업시설에서 발생하는 이산화탄소는 대부분 화석연료의 연소로 인해 발생되지만 아직까지는 화석연료를 대체할 수 있는 안정적인 에너지공급원이 존재하지 않기 때문에 발생되는 이산화탄소를 대기 중으로 방출하기 전에 포집하는 것이 중요하다. CCS(Carbon Capture and Utilization) 기술을 이용하면 산업 배가스 내에 포함된 이산화탄소를 포집할 수 있으나, 우리나라의 경우 포집된 이산화탄소를 최종적으로 지중저장, 해양저장 등의 방법을 통해 처리하기에 적합하지 않다. 이에 이산화탄소를 포집한 후 포집결과물을 폐기물이 아닌 자원으로 인식하여 재이용하기 위한 노력이 전개되었으며, CCU (Carbon Capture and Utilization) 기술이라고 한다. 본 연구에서는 질산암모늄과 산화칼슘 혼합물을 이산화탄소 흡수제로 사용하였으며, 질산칼슘을 이용하여 흡수제 재이용이 가능한 연속공정에 대해 연구하였다. 이산화탄소 흡수 실험을 위해 이산화탄소와 질소가스를 균일하게 혼합하여 15 vol%의 CO<sub>2</sub> 모사가스를 만들어 사용하였다. 대조군 과의 CO<sub>2</sub> loading curve비교를 통해 NH<sub>4</sub>NO<sub>3</sub>의 생성 및 흡수제 재이용 가능성을 분석하였으며, 유도결합 플라즈마 분광분석(ICP-OES), 엑스선 회설분석법(XRD), 주자전자현미경(SEM) 기기분석을 수행하였다. 결과적으로 이산화탄소 흡수, 칼슘이온 추출, 침강성 탄산칼슘 생성이 가능함을 확인하였다.
이민구,정명호,안영근,채성철,허승호,홍택종,김영조,성인환,채제건,류재영,채인호,조명찬,배장호,나승운,김종진,최동훈,장양수,윤정한,정욱성,조정관,승기배,박승정 대한의학회 2010 Journal of Korean medical science Vol.25 No.10
We sought to determine the prevalence of metabolic syndrome (MS) in patients with acute myocardial infarction and its effect on clinical outcomes. Employing data from the Korea Acute Myocardial Infarction Registry, a total of 1,990 patients suffered from acute STelevation myocardial infarction (STEMI) between November 2005 and December 2006were categorized according to the National Cholesterol Education Program-Adult Treatment Panel III criteria of MS. Primary study outcomes included major adverse cardiac events (MACE) during one-year follow-up. Patients were grouped based on existence of MS: group I: MS (n=1,182, 777 men, 62.8±12.3 yr); group II: Non-MS (n=808, 675 men,64.2±13.1 yr). Group I showed lower left ventricular ejection fraction (LVEF) (P=0.005). There were no differences between two groups in the coronary angiographic findings except for multivessel involvement (P=0.01). The incidence of in-hospital death was higher in group I than in group II (P=0.047), but the rates of composite MACE during one-year clinical follow-up showed no significant differences. Multivariate analysis showed that low LVEF, old age, MS, low high density lipoprotein cholesterol and multivessel involvement were associated with high in-hospital death rate. In conclusion, MS is an important predictor for in-hospital death in patients with STEMI.
침치료가 뇌졸중으로 인한 구음장애에 미치는 음향적 특성에 대한 증례보고
이민구,박세욱,이선우,유현희,이승언,김용정,손지우,임은경,김성남,이인,문병순,윤종민,Lee, Min-Goo,Park, Sae-Wook,Lee, Sun-Woo,Ryu, Hyun-Hee,Lee, Seung-Eon,Kim, Yong-Jeong,Son, Ji-Woo,Rhim, Eun-Kyung,Kim, Sung-Nam,Lee, In,Moon, Byung-Soon 대한한방내과학회 2005 大韓韓方內科學會誌 Vol.26 No.3
Objectives : The aim of this study is to find the acoustic characteristics of acupuncture therapy effects on post-stroke dysarthria. Methods : Acupuncture therapy was applied for four to six weeks by inserting needles into eight acupuncture points, CV23, CV24, bilateral 'Sheyu' and ipsilateral ST4, ST6 and contralateral LI4, ST36 on facial palsy side. All the speech samples were collected, pre-treatment and post-treatment, using Computerized Speech Lab. VOT and TD of each speech sample and vowel formant(F1&F2) were analyzed on spectrogram. Result : VOT and TD were decreased after treatment. F1 was decreased, and F2 was increased after treatment. Conclusions : This suggests that acupuncture therapy improves symptoms of post-stroke dysarthria by stimulating articulation organs such as tongue, lips, cheeks, larynx and pharynx.
중년 및 노인에서의 만성 폐쇄성 폐질환과 비용종 발생 감소의 상관성
이민구,김시환,양정환,이주한,최효근 대한이비인후과학회 2016 대한이비인후과학회지 두경부외과학 Vol.59 No.4
Background and Objectives Chronic obstructive pulmonary disease (COPD) is known to induce chronic rhinosinusitis (CRS). Nasal polyp, which is frequently found in patients with CRS, seems to have close relationship with COPD, but little is known about its relationship with COPD. In this study, we investigated the relationship between COPD and nasal polyp in middle aged and elderly CRS patients. Subjects and Method We analyzed the clinical data of 174 patients (age of over 50 years) with CRS. Patients were divided as COPD [forced expiratory volume (FEV1)/forced vital capacity (FVC)<70%, n=30] and non-COPD group (FEV1/FVC≥70%, n=144) according to the pulmonary function test results. Binary logistic regression analysis was used to describe the relationships between clinically relevant factors related to nasal polyp. Results On logistic regression analysis, no significant relationship was found between age [adjusted odds ratio (AOR): 1.058, 95% confidence interval for the difference (CI)=0.995-1.126, p=0.073], sex AOR: 0.897, 95% CI=0.366-2.415, p=0.897), smoking (AOR: 0.434, 95% CI=0.154-1.219, p=0.113) and obesity (underweight AOR: 3.833, 95% CI=0.781-18.808, p= 0.098, overweight AOR: 5.169, 95% CI=0.996-26.814, p=0.051, obese AOR: 2.911, 95% CI= 0.335-25.329, p=0.333) with polyp. However, there was a negative correlation between COPD history and nasal polyp with statistical significance (AOR: 0.288, 95% CI=0.102-0.809, p=0.018). Conclusion Our findings suggest that patients with COPD are less likely to have nasal polyp than patients without COPD. Korean J Otorhinolaryngol-Head Neck Surg 2016;59(4):287-92
이민구,원중연,김형종 대한이비인후과학회 2014 대한이비인후과학회지 두경부외과학 Vol.57 No.7
Background and Objectives There is no consensus on the prognostic factors regarding pos-toperative recurrence after myringoplasty. In this study, we investigated the preoperative clinical findings and postoperative results after primary myringoplasty and compared them with those of revision myringoplasty. Subjects and Method Computerized database of 861 clinical records of last 20 years were analyzed retrospectively for the subjects who underwent myringoplasty at the Department of Otolaryngology, University of Korea. All the surgeries were done under general or local anesthesia by senior surgeons. Primary and revision cases of myringoplasty or type 1 tympanoplasty followed up at least for longer than 3 months were only included in the study. Those other cases of tympanoplasty types, concomitant ossiculoplasty and/or mastoidectomy, or those with the presence of cholesteatoma and those that required repair during exploratory tympanotomy were excluded. Results 535 primary and 101 revision cases have met our inclusion criteria. Overall, in this study, the failure rates of primary and revision myringoplasty were 11.02% and 5.94%, respectively. Significantly different among the prognostic factors were such as sex, age, anesthesia, surgical approach, the presence of otorreha, size of eardrum perforation, external auditory canal narrowing, valsalva test, degree of pneumatization, graft materials, tympanoplasty type, previous mastoidectomy, the presence of bilateral otitis media influencing on myringoplasty revision, and the presence of otorrhea and sclerotic type of mastoid pneumatization. Conclusion Among various prognostic factors of myringoplasty, poor prognostic factors were preoperative otorrhea and poor pneumatization. Korean J Otorhinolaryngol-Head Neck Surg 2014;57(7):454-9
판형 부품의 밀링 가공에 의한 변형 최소화에 대한 연구
이민구,윤재웅,Lee, Min-Gu,Yun, Jae-Woong 한국금형공학회 2021 한국금형공학회지 Vol.15 No.3
Plate-shaped works are one of the materials that can be applied to the entire industry due to their various shapes and sizes. Plate-shaped parts workpieces are thin and wide, and when processing is completed, they are often bent or deformed in various directions, making it difficult to produce normal products. In particular, this study intends to study the processing deformation and distortion of plate-shaped parts fastened to the jig during milling processing. In this study, a method for preventing deformation occurring in plate-shaped parts was derived through jig element change and CAE analysis, and this was applied to actual processing to produce products with stable dimensions. Through a finite element analysis experiment, it was found that installing two supports on the back of the plate-shaped part results in minimal deformation and the optimal distance between the two supports is 150 mm. Through this experiment, when processing a thin plate product, a support was installed in a direction opposite to the cutting force applied to the thin plate to prevent deformation of the product, thereby improving defects.
이민구,홍세연 한국의철학회 2015 의철학연구 Vol.20 No.-
임상의학의 탄생에서 푸코는 질병의 공간화를 통해 다양한 층위에서 질병을 분석하였다. 의학 속의 질병, 몸에 자리 잡은 질병, 사회집단 속에 존재하는 질병이 각각 1, 2, 3차 공간에서의 질병이다. 2012년 중동에서 처음 보고된 중동 호흡기 증후군(메르스)이 2015년 한국에도 전파되어 의료사회 뿐만 아니라 사회 전반에 많은 후유증을 남겼다. 중동 호흡기 증후군은 푸코가 지적한 세 공간 모두에서 의미 있는 분석이 가능하다. 새로이 발견되어 질병의 본질에 대한 파악이 안 되어 있다는 점에서, 한국 의료 문화에서 개인의 의료 행동의 특징과 전염병의 관계에서, 인간의 이동능력이 크게 향상된 현대 사회에서 전염병 환자와 전염병 의심 집단의 관리 문제에서 각각 1, 2, 3차 공간 속 중동 호흡기 증후군에 대한 심도 있는 분석이 요구된다. 한국을 포함한 현대 사회에서 건강에 대한 관심과 욕구가 증대되고 개인의 이동성이 크게 향상되었기 때문에, 파급력이 큰 전염병과 같은 질병의 관리와 대처에는 의학 지식의 발전 뿐 아니라 질병 인식이라는 인문학적 성찰의 필요성이 크게 증가했다. 이에 본 논문에서는 푸코의 공간화를 적용한 인문 의학적 인식의 틀을 적용하여 최근 새로이 발생한 질병으로 한국 사회에 큰 영향을 준 중동 호흡기 증후군을 분석하였다.