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시멘트 제조과정 중 실리카질 석회암 부산물(HSG)을 골재로 이용하는 콘크리트의 공학적 특성
한천구(Han, Cheon-Goo),강창운(Kang, Chang-Woon) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.10
Highly silicious limestone gravel (HSG) contains high volume of calcium carbonate and silica. It is a by-product material obtained from cement manufacturing process, and thus needs to be utilized in terms of waste management. This study investigates the effect of HSG on the mechanical properties of both normal and high strength concretes. For normal concrete, various amount of HSG was replaced with coarse aggregates to study the effect caused by replacing coarse aggregate with HSG. Various water to binder ratios were used to study the effect of HSC on high strength concrete. Results showed that the replacement of coarse aggregate with HSG showed similar mechanical properties to normal concrete without HSG. In high strength concrete, higher elastic modulus was obtained although all other mechanical properties were similar to reference concrete. It was found that the effectiveness of HSG on the slump, air content, compressive strength and elastic modulus of the concrete, were higher when HSG was used for high strength concrete.
경증 및 중등도 고혈압에서 Enalapril 의 강압 효과
김종성(Joug Seong Kim),강창운(Chang Woon Kang) 대한내과학회 1989 대한내과학회지 Vol.37 No.6
N/A A new antihypertensive agent, the angiotensin converting enzyme inhibitor enalapril 20 mg daily, was ad- ministered to 23 mild and 16 moderate hypertensive patients for 2 weeks or more. The combination of enalapril 20mg and hydrochlorothiazide 50mg daily was used in 3 mild and 16 moderate hypertensive patients without decreased BP and compared to enalapril alone 20 mg daily. CBC, urinalysis, serum chemistry, chest P-A and ECG were done before and after the treatment of enalapril. The results were as follows: 1) The standing systolic BP after the treatment of only enalapril 20 mg daily in 23 mild hypertensive patients was significantly decreased (142±8mmHg) compared with 179±12 mmHg before the treatment, and the supine systolic BP after the treatment was also significantly decreased (142±8 mmHg) compared with 181±10 mmHg before the treatment. The standing diastolic BP after the treatment of eualapril 20 mg daily was significantly decreased (78±7 mmHg) compared with 97±9mmHg before the treatment, and the supine diastolic BP after the treatment was significantly decreased (82±9mmHg) compared with 101±8 mmHg before the treatment. Enalapril alone (20 mg daily) decreased the BP to the normal limit in 20 (87%) of 23 mild hypertensive patients. 2) The standing systolic BP after the combined use of enalapril 20 mg and hydrochlorothiazide 50 mg daily in a totlal of 19 hypertensive patients; 3 mild and 16 moderate hypertensive patients without good response to enalapril alone, was significantly reduced (140±9 mmHg) compared with 188 mmHg before the treatment. Also the supine systolic BP after the combined use was significantly reduced (144±10 mmHg) compared with 186±13 mmHg before the treatment. The standing diastolic BP of 83±9 mmHg after the combined use of enalapril 20mg and hydrochlorothi-azide 50 mg daily in 19 hypertensive patients was significantly reduced compared with 101±13 mmHg before the treatment, and the supine diastolic BP of 85±8mmHg was also significantly reduced compared with 103±11 mmHg before the treatment. The combined use of enalapril 20 mg and hydrochlor-othiazide 50 mg daily decreased the RP to the normal range in 16 (84%) of 19 hypertensive patients without good response to enalapril alone 20 mg daily. 3) The heart rates were not significantly changed after the treatment of enalapril in 39 hypertensive patients. 4) The ECG findings in 39 hypertensive patients revealed ST-T wave changes in 9, LVH in 3, right B.B. B. in 2 and arrhythmia in 1 before the treatment of enalapril, and those persisted after the treatment. 5) The CBC, urinalysis and serum chemistry revealed normal ranges before and after the treatment of enalapril in 39 hypertensive patients. Chest P-A films in 39 hypertensive patients showed cardiomegaly in 4 before the treatment of enalapri l and the finding persisted after the treatment. 6) The adverse effects showed headache in 2, and dizziness and facial flushing in 1 each respectively of 39 hypertensive patients after the treatment of enalapril.
시멘트의 원료분쇄 과정 중 부산물로 발생하는 실리카질 석회암의 콘크리트용 골재화
한천구(Han, Cheon-Goo),강창운(Kang, Chang-Woon) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.7
In this paper, the physical, chemical and mineral properties of High Silicious Limestone Gravel(HSG), which is a by-product from cement production process, was investigated experimentally to explore the possibility for the use HSG as coarse aggregate for concrete. The size of HSG was in the range of 5 ㎜ to 20 ㎜. It was found that HSG had higher density and abrasion resistance than other ordinary concrete aggregates made of granite, basalt and andesite and it was proved to be stable to alkali-silica reaction. The main constituents of HSG were SiO2 and CaO, and SiO2 content of HSG was higher than ordinary limestone used for cement production, while it was lower than granite stone. The content of CaO of HSG was higher than that of granite stone but lower than that of lime stone. All the result of analyses and tests of HSG gave satisfactory results for using it as concrete aggregate, so it could be utilized as concrete aggregate.
김종성,강창운 대한내과학회 1989 대한내과학회지 Vol.37 No.6
Superior venal cava syndrome is a medical emergency seen in 3~8% of patients with bronchial carcinoma and lymphoma and requires immediate therapeutic action. A 58-year-old white man presented with pleural effusion and dyspnea and developed superior vena cava syndrome despite introduced chemotherapy with cisplatin and etoposide. Squamous cell bronchial carcinoma was confirmed via bronchoscopy and thoracoscopy. The authors report this case with a literature review.