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Struvite 결정화를 이용한 혐기성 발효액 중의 질소 및 인의 제거
김학균,김종오,정종태 7개 국립대학교 환경연구 논문집 공동발행 위원회 2004 공업기술연구 Vol.4 No.-
Removal of nitrogen and phosphorus through crystallization of struvite has gained increasing interest. Struvite, magnesium ammonium phosphate hexahydrate (MgNH_(4)PO_(4)·6H_(2)O), is a white inorganic crystalline mineral. It's crystallization can provide high removal efficiency of nitrogen and phosphorus in wastewater. Experiments were performed to determine the optimum condition for the struvite crystallization in anaerobic fermentation supernatant using synthetic wastewater. MgSO_(4)·7H_(2)O and KH_(2)PO_(4) were used as magnesium and phosphorus was 11 and mole ratio of Mg^(2+) to NH_(4)^(+) to PO_(4)^(3-) was 1.2:1:1.2. It was found that at least 5 minutes' reaction time was required and 10 minutes' reaction time was recommended for efficient nitrogen and phosphorus removal. 84.3% of the ammonia nitrogen and 98.4% of the phosphate were elimi-nated at this conditions.
합성하수를 이용한 금속 막의 정밀여과 특성 및 막 오염 제어
정종태,김종오,김학균,김석구,이용재 7개 국립대학교 환경연구 논문집 공동발행 위원회 2004 공업기술연구 Vol.4 No.-
This study was to evaluate the filtration performance of metal membrane with synthetic wastewater and to investigate the effective control of membrane fouling using ozone backwashing. The increase of substrate concentration caused the increase of cake layer resistance and total resistance, however, plugging resistance decreased. Total resistance of metal membrane was mainly attributed to the permeate resistance of cake layer, which was formed by deposited particles from the physico-chemical interactions of solids on membrane surface. Intermittent ozone backwashing was more effective then the air backwashing for fouling reduction. The permeation flux recovery of air backwashing decreased over 50%, however, ozone backwashing decreased less than 10% for 4 hours filtration. This may be ascribed to the degradation of foulants in pore structure by the strong oxidation of ozone and physical exfoliation of cake layer on membrane surface with backwashing.
체외충격파 쇄석술 시행 후 5년 뒤 발생한 요관 협착 및 농신장 1예
이현승,권균홍,조용건,김봉진,임창섭,김자영,허동,임학 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.4
A 40-years-old woman was admitted to this hospital with flank pain and high grade fever for 2 weeks. As a matter of her past history, extracorporeal shock wave lithotripsy (ESWL) was performed for treatment of renal stones 5 years ago. Her abdominal CT findings were hydronephrosis with pyonephrosis and renal stones. Antibiotics administered for 5 days had no effects on her symptom improvement. A right ureteral stricture was noticed by ultrasonography follow up. We inserted double J stent and continued antibiotics therapy for 10 days, and then her fever was disappeared and flank pain was improved. ESWL is one of the most important treatment of renal and ureteral stone. However, its complications should not be negligible including bleeding, pain, ureteral obstruction, infection and so on. Complications of ESWL can be divided into acute and chronic courses. When we treat pyelonephritis patient with past history of ESWL, possibility of ureteral stricture must also be considered. In this study we report a case of pyelonephritis caused by ureteral stricture, possibly as a chronic complication of ESWL performed 5 years earlier
Kim, Young-Il,Kim, Mi-Jung,Park, Sook Ryun,Kim, Hark Kyun,Cho, Soo-Jeong,Lee, Jong Yeul,Kim, Chan Gyoo,Kim, Gwang Ha,Park, Moo In,Nam, Byung-Ho,Park, Young Iee,Choi, Il Ju The Korean Gastric Cancer Association 2017 Journal of gastric cancer Vol.17 No.2
Purpose: Tumor bleeding is a major complication in inoperable gastric cancer. The study aim was to investigate the effects of proton pump inhibitor (PPI) treatment for the prevention of gastric tumor bleeding. Materials and Methods: This study was a prospective double-blind, randomized, placebo-controlled trial. Patients with inoperable gastric cancer were randomly assigned to receive oral lansoprazole (30 mg) or placebo daily. The primary endpoint was the occurrence of tumor bleeding, and the secondary endpoints were transfusion requirement and overall survival (OS). Results: This study initially planned to enroll 394 patients, but prematurely ended due to low recruitment rate. Overall, 127 patients were included in the analyses: 64 in the lansoprazole group and 63 in the placebo group. During the median follow-up of 6.4 months, tumor bleeding rates were 7.8% and 9.5%, in the lansoprazole and placebo groups, respectively, with the cumulative bleeding incidence not statistically different between the groups (P=0.515, Gray's test). However, during the initial 4 months, 4 placebo-treated patients developed tumor bleeding, whereas there were no bleeding events in the lansoprazole-treated patients (P=0.041, Gray's test). There was no difference in the proportion of patients who required transfusion between the groups. The OS between the lansoprazole (11.7 months) and the placebo (11.0 months) groups was not statistically different (P=0.610). Study drug-related serious adverse event or bleeding-related death did not occur. Conclusions: Treating patients with inoperable gastric cancer with lansoprazole did not significantly reduce the incidence of tumor bleeding. However, further studies are needed to evaluate whether lansoprazole can prevent tumor bleeding during earlier phases of chemotherapy (ClinicalTrial.gov, identifier No. NCT02150447).
김학균(Hark Kyun Kim),방수미(Soo Mi Bang),변재호(Jae Ho Byun),류민희(Min Hee Ryu),이원섭(Won Sup Lee),이근석(Keun Seok Lee),정주영(Joo Young Jeong),김지현(Jee Hyun Kim),이세훈(Se Hoon Lee),나임일(Im Il Na),허대석(Dae Seog Heo),방영주(Yo 대한내과학회 2000 대한내과학회지 Vol.58 No.4
Background : The aim of this study is to determine prognostic factors of breast cancer in Korean patients who underwent curative mastectomy. Methods : Medical records of 181 patients who underwent curative mastectomy were reviewed. Relapse-free survival and overall survival were documented for each patient. Factors influencing survival were analyzed using Cox proportional hazard model. Results : Overall 5-year survival rate was 82.0%, and 8-year survival rate was 74.7%. Multivariate analysis indicated that multiple axillary lymph node involvement (≥4), postmenopausal status, and negative estrogen receptor were independent adverse prognostic factors. The adjusted relative risks of multiple axillary lymph node involvement (≥4), postmenopausal status, and negative estrogen receptor were estimated 2.60 (95% Confidence Interval (CI): 1.28-5.30), 2.64 (95% CI: 1.46-4.79), and 2.27 (95% CI: 1.19-4.35), respectively. Conclusion : Multiple axillary lymph node involvement (≥4), postmenopausal status, and negative estrogen receptor were independent adverse prognostic factors in Korean breast cancer patients after curative mastectomy.(Korean J Med 58:446-452, 2000)
( Eunae Kim ),( Hark Kyun Kim ),( Jae Hoon Sul ),( Jeongmi Lee ),( Seung Hyun Baek ),( Yoonsuk Cho ),( Jihoon Han ),( Junsik Kim ),( Sunyoung Park ),( Jae Hyung Park ),( Yong Woo Cho ),( Dong-gyu Jo ) 한국응용약물학회 2024 Biomolecules & Therapeutics(구 응용약물학회지) Vol.32 No.4
Systemic sclerosis is an autoimmune disease characterized by inflammatory reactions and fibrosis. Myofibroblasts are considered therapeutic targets for preventing and reversing the pathogenesis of fibrosis in systemic sclerosis. Although the mechanisms that differentiate into myofibroblasts are diverse, transforming growth factor β (TGF-β) is known to be a key mediator of fibrosis in systemic sclerosis. This study investigated the effects of extracellular vesicles derived from human adipose stem cells (ASC-EVs) in an in vivo systemic sclerosis model and in vitro TGF-β1-induced dermal fibroblasts. The therapeutic effects of ASC-EVs on the in vivo systemic sclerosis model were evaluated based on dermal thickness and the number of α-smooth muscle actin (α-SMA)-expressing cells using hematoxylin and eosin staining and immunohistochemistry. Administration of ASC-EVs decreased both the dermal thickness and α-SMA expressing cell number as well as the mRNA levels of fibrotic genes, such as Acta2, Ccn2, Col1a1 and Comp. Additionally, we discovered that ASC-EVs can decrease the expression of α-SMA and CTGF and suppress the TGF-β pathway by inhibiting the activation of SMAD2 in dermal fibroblasts induced by TGF-β1. Finally, TGF-β1-induced dermal fibroblasts underwent selective death through ASC-EVs treatment. These results indicate that ASC-EVs could provide a therapeutic approach for preventing and reversing systemic sclerosis.
김석동(Kim Suk-Dong),박용걸(Park Yong-Gul),김대상(Kim Dae-Sang),김학균(Kim Hark-Kyun) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Floating sleepers in a ballasted track increase both track deterioration and track irregularities. Consequently, a considerable maintenance work is required and maintenance cycle is shortened due to the floating sleepers. This paper quantifies the degrees of void between the floating sleepers and a ballast bed. In the future, the influence of floating sleepers on the track will be investigated by an analytical method using a dynamic model.
A Comprehensive and Comparative Review of Global Gastric Cancer Treatment Guidelines
Eom Sang Soo,Choi Wonyoung,Eom Bang Wool,Park Sin Hye,Kim Soo Jin,Kim Young Il,Man Yoon Hong,Lee Jong Yeul,Kim Chan Gyoo,Kim Hark Kyun,Kook Myeong-Cherl,Choi Il Ju,Kim Young-Woo,Park Young Iee,Ryu Keu 대한위암학회 2022 Journal of gastric cancer Vol.22 No.1
Countries differ in their treatment expertise and research results regarding gastric cancer; hence, treatment guidelines are diverse based on evidence and medical situations. A comprehensive and comparative review of each country’s guidelines is imperative to understand the similarities and differences among countries. We reviewed and compared five gastric cancer treatment guidelines in terms of endoscopic, surgical, perioperative, and palliative systemic treatment based on evidence levels and recommendation grades, as well as the postoperative follow-up strategies for each guideline. The Korean, Chinese, and European guidelines provided evidence and grading of the recommendations. The United States guidelines suggested categories for evidence and consensus. The Japanese guidelines suggested evidence and recommendations only for systemic treatment. The Korean and Japanese guidelines described endoscopic treatment, surgery, and lymphadenectomy in detail. The Chinese, United States, and European guidelines more intensively considered perioperative chemotherapy. In particular, the indications for chemotherapy and the regimens recommended by each guideline differed slightly. Considering their medical situations, each guideline had some diversity in terms of adopting evidence, which resulted in heterogeneous recommendations. This review will help medical personnel to comprehensively understand the diversity in gastric cancer treatment guidelines for each country in terms of evidence and recommendations.
Sentinel Node Biopsy with Double Tracers of Dye and Isotope in Early Gastric Cancer
Jun Ho Lee,Keun Won Ryu,Sang Gyun Kim,Chan Gyoo Kim,Seok-Ki Kim,Il Ju Choi,Young Woo Kim,Myeong-Cherl Kook,Hee Jin Chang,Ji Yoon Rho,Sook Ryeon Park,Hark Kyun Kim,Jae-Moon Bae,Eun Kyoung Hong 대한외과학회 2005 대한외과학회 학술대회 초록집 Vol.2005 No.10