조기강도 발현형 AE감수제를 사용한 콘크리트의 특성에 관한 연구

황인성,김규동,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

This study discusses the fundamental properties and early strength development of concrete using AE water reducing agent of early-strength type. According to the result, when AE water reducing agent of early-strength type is used, slump and air content loss is smaller than normal AE water reducing agent. While setting time is retarded with an increase of the adding amount of normal AE water reducing agent, it is maintained constantly regardless of the adding amount and faster than normal AE water reducing agent in the case of AE water reducing agent of early-strength type, and bleeding amount is larger than normal AE water reducing agent especially at early age. At curing temperature of 20℃, early compressive strength gains 5MPa, which side form can be removed, before 16 hours in the case of AE water reducing agent of early-strength type, but early compressive strength development is delayed in the case of normal AE water reducing agent. At curing temperature of 10℃, AE water reducing agent of early-strength type is also better than normal AE water reducing agent especially for early compressive strength development.

트리에탄올아민의 혼입률 변화에 따른 콘크리트의 초기 강도발현 특성

황인성,金光華,김규동,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

In this study, the influence of TEA on early strength development of concrete is discussed in order to reduce a construction period in RC structure by early removal of forms. According to the results, as for the properties of fresh concrete, fluidity of concrete shows no difference, and air content increases with an increase of the mixing ratio of TEA. Setting time is shortened upto mixing ratio of 0.025%, but is retarded above the mixing ratio of 0.025%. The time when compressive strength gains 5MPa is fast in about 2 hours in the case of the mixing ratio of 0.05%, but it is retarded above the mixing ratio of 0.05%. The relativity between compressive strength and the rebound value of P-type Schmidt hammer is also favorable at early age, and compressive strength of 5MPa, which the side forms can be removed, is estimated at the rebound value of 23.

閑山·巨濟灣 굴, 진주담치 및 海水의 重金屬含量

黃奎喆,李應昊,金成晙 釜山水産大學校 1984 釜山水産大學 硏究報告 Vol.24 No.1

1982년 7월부터 12월까지 南海岸의 閑山·巨濟灣에서 양식되고 있는 굴 및 自生하고 있는 진주담치와 海水에 대한 重金屬(Hg, Cd, Cu, Pb 및 Zn) 含量을 調査하고 成長過程, 水深別 그리고 굴과 진주담치의 重金屬含量을 相互 比較하였다. 1. 海水에 있어 구리 含量은 대체로 表層이 5m層보다 높았고 그 平均값은 각각 5.0, 3.3ppb였으며, 水銀은 0.132, 0.137ppb로 表層과 5m層間에 差異가 거의 없었다. 2. 굴의 成長에 따른 重金屬含量은 대체로 아연과 구리는 增加하는 반면 카드뮴, 납 및 水銀은 특징적인 變化는 나타나지 않는다. 그리고 水深別(表層 및 5m層)굴의 重金屬含量은 아연과 구리에서 약간의 差異가 있을 뿐 다른 重金屬은 같은 수준이었다. 3. 閑山·巨濟灣에 있어 굴과 진주담치의 重金屬含量(1982年 10月 基準)은 각각 카드뮴 0.55, 0.21ppm, 구리 6.42, 0.66ppm, 납 0.69, 0.41ppm, 아연 101.6, 18.4ppm, 水銀0.009, 0.006ppm으로 굴이 진주담치보다 높았으며, 美國貝類衛生 7次 workshop 推薦暫定基準値인 카드뮴 1.5∼3.5ppm, 구리 42∼175ppm,납 2.0ppm, 아연 1,000∼2,000ppm, 水銀 0.2ppm에 比하여 낮은 값이었다. The quantitive analysis of heavy metals(Hg, Cd, Cu, Pb and Zn) in oyster, Crassostrea gigas, and blue mussel, Mytilus edulis, and growing water associated with hanging culture in Hansan-Geoje Bay on the south coast of Korea were conducted during the period of July to December in 1982. The content of heavy metals in shellfish by growth, water depth, and species were discussed. In sea water, copper content of surface water was in general highe than that of five meter depth to some extent with average of 5.0 and 3.3 ppb, respetively. There were little differences of mercury content between the two water depth, and averaged 0.132 and 0.137, respectively. Cadmium, lead and zinc were indeterminable. In oyster, the contents of copper and zinc by growth showed a trend of gradual increasing with increasing of meat weight, whereas there were little differences in cadmium, lead and mercury during the study period. And there were no differences between surface and five meter depth. The levels of heavy metal in oyster were consistently higher then that in blue mussel. Heavy metal content of both oyster and blue mussel in Hansan-Geoje Bay taking the results in October that it showed higher metal concentration in shellfish during the study period, were 0.55 and 0.21 ppm for cadmium, 6.42 and 0.66 and ppm for copper, 0.69 and 0.41 ppm for lead, 101.6 and 18.4 ppm for zinc and 0.09 and 0.006 ppm for mercury, respectively. They were much less than the alert levels for oyster proposed by the Chemical Task Force of U.S. FDA 7th National Shellfish Sanitation workshop in 1977 that were 1,000-2,000 ppm for zinc 42-175 ppm for copper, 1.5-3.5 ppm for cadmium, 2.0 ppm for lead and 0.2 ppm for mercury.

블리딩저감용 AE감수제의 개발 및 실용성 검토

황인성,장덕우,김규동,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

This study is intended to develop AE water reducing agent for reduction of bleeding and investigate its practical use. According to the results, fluidity and air content increases with an increase of superplasticizer and MC viscosity agent, AE water reducing agent for reduction of bleeding is developed after determining the ratio of superplasticizer and MC viscosity agent as 3:1 to satisfy the same fluidity and air content to conventional concrete and reduce bleeding amount. As the adding ratio of developed AE water reducing agent for reduction of bleeding increases, fluidity also increases, air content satisfies the aimed range, bleeding and sinking amount of concrete are reduced, and compressive strength is almost not different from plain concrete. Therefore, developed AE water reducing agent for reduction of bleeding satisfies the aimed air content in the range of slump 12~21cm, and can also reduce bleeding amount effectively without quality deterioration of compressive strength.

환경친화적 고체연료 개발 : 패각 및 석탄의 특성과 탈황반응

서성규,황원준 國立 麗水大學校 環境問題硏究所 2000 環境硏究論文集 Vol.3 No.-

In this study, characteristics of sea shell, coal and desulfurization have been investigated in order to examine the feasibility on the development of the clean solid fuel. Physico-chemical properties of waste sea shells and limestone have been characterized by using BET, XRD, and SEM. The main component of oyster shell was CaCO_(3) similar to limestone. After calcination of oyster shell, specific area decreased, and pore diameter increased. Under this experimental conditions, desulfurization efficiency of sea shells was the range of 49.1~61.7%. The desulfurizer capacity and efficiency of oyster shell were higher than others. The best fit desulfurization condition of oyster shell based on economy and desulfurization efficiency was as follows : particle size = 90~150㎛, and Ca/S =1.5~3.0. We can conclude that wasted sea shells can be used as a desulfurizer on the development of clean solid fuel

Metal separator의 자력개선과 자동차 연구

서성규,황원준,양병곤 여수대학교 산업기술지역개발연구소 2001 産業基術硏究所 論文集 Vol.10 No.-

The metal separators which are used at chemical plants and/or plastic powder manufacturing plants are to improve the productivity and reduce the inferiority of the materials and protect the machines so as to prevent the malfunction of the machines. The metal separators are divided according to the collecting methods as permanent magnet, electro magnet, supersonic waves and each method has advantages and disadvantages. The extensively spread metal separator is magnet type which has relatively low collecting ratio to 91%, but the facility cost is cheap and almost no annual operation cost with long average life span. The magnetic force intensity of the magnet bar surface can improve the efficiency of alien substance remove. The extensively used current permanent magnet type has the maximum 4000 gauss of surface magnetic force intensity. Recently a local company developed a maximum 8500 gauss of surface magnetic force intensity and supply to the local market with equal capacity to the imported one. But, the alien substance collected on the permanent magnet bar may be removed manually and it is required of magnetic force improvement and automation for process and economical efficiency. Therefore, the object of this research is to develop the magnetic force improved magnetic bar and automatic device for the collected alien substance removal, so improve the collecting ratio and the efficiency of the production process. We tested the optimized conditions by measuring the magnetic force of the permanent magnet bar according to the magnet location and size. As a result of this research, we developed a magnet bar with surface magnetic force intensity with maximum 8500 gauss. Also, we tried to check the possibility of the automation by testing of surface resin coating method for automation device development, researching the collecting capacity of alien substance and designing the stabilization of machine process structure.

Bisthmus 제재와 항생제의 복합 투여가 Helicobactor pylori 박멸과 재발에 미치는 영향

김선주,황성규,박상흠,이문호 순천향대학교 1994 논문집 Vol.17 No.4

위점막내에 존재하는 Helicobacter pylori는 소화성 궤양의 발생과 재발에 중요한 인자로 인식되고 있으며, bisthmus, metronidazole, amoxicillin을 포함하는 3제 병합요법을 시행하면 H. pylori균의 박멸에 유효하고 소화성 궤양 재발 빈도를 낮출 수 있다고 한다. 그러나 3제 병합요법은 부작용 발생율이 높아 치료 실패의 주원인이 되고 있다. 이에 저자등은 H. pylori 양성인 소화성 궤양환자에서 H₂ 길항제 투여와 함께 3제 병합요법을 시행하였고, 또한 비교적 약제 부작용이 많은 metronidazole을 제외한 이제 병합 요법을 시행하여 H₂ 길항제 단독 투여한 대조군과 6개월간 추적하여 균의 박멸및 재발 여부를 비교 관찰하였다. 대조군은 Nizatidine을 8주간 투여하였으며 치료 1군은 nizatidine(150mg 하루 2회 복용)을 8주간 투여하고 첫 2주간은 TDB(240mg 하루 2회 복용), amoxicilline(500mg 하루 4회 복용) 투여하였다. 치료 2군은 nizatidine(150mg 하루 2회 복용)을 8주간 투여하고 첫 2주간은 TDB(240mg 하루 2회 복용)과 amoxicilline(500mg 하루 4회복용) metronidazole (250mg thrice a day)을 투여하였다. 치료 8주후 치료 1군은 53%에서, 치료 2군은 100%에서 균이 음전되었으나 대조군은 1예도 음전되지 않았다. 치료 2군의 13%에서 약물에 의한 부작용이 관찰되었다. 치료 6개월 추적 검사시 대조군은 모두 H. pylori 감염이 지속되었으며 치료 1군에서는 63%에서 재발하였으며, 치료 2군에서는 15%에서 재발하였다. 대조군에서는 소화성 궤양(위궤양 1명, 십이지장 궤양 4명)이 5명에서 재발하였으나 치료군에서는 재발이 없었다. H. pylori박멸된 환자에서의 항 H.pylori 항체(IgG)가는 치료 6개월에 치료전의 40%로 감소한 반면, 대조군의 항체가는 변화가 없었다. 이상의 결과로 H₂ 길항제(nizatidine)을 metronidazole 750mg/day, TDB 480mg/day, amoxicillin 2.0gm/day를 2주간 투여하면 약제에 의한 합병증이 비교적 적고, Helicobacter pylori 박멸과 재발 방지에 효과적이며 혈청 H. pylori 항체(IgG)의 추적 검사는 항 H. pylori 치료후 균박멸의 추적검사에 유용함을 알 수 있었다. It has recently been recognized that Helicobacter pylori is a important factor in the development and the recurrence of peptic ulcer diseases. Several studies has been shown that the eradication of Helicobacter pylori is associated with considerable reduction in the the rate of recurrence of peptic ulcer. Triple therapy including bisthmus, amoxicillin, metronidazole is known to be useful in the eradication of Helicobacter pylori, but relatively frequent side effects are a major problem. This study was performed to evaluate the clinical course and the efficacy of triple therapy with H₂ blocker and bisthmus plus amoxicillin therpy with H₂ blocker in the eradication and the recurrence of Helicobacter pylori at 8 weeks and 6 months of treatment. Forty five patients with peptic ulcer disease with a positive urease test of the gastric mucosa were enrolled and assigned to receive H₂ blocker (nizatidine 150mg twice a day) for 8 weeks(control group), tripottasium dicitrato bismuthate 240mg twice a day and amoxicillin 500mg four times a day for 2 weeks, nizatidine for 8 weeks (treatment group Ⅰ), tripottasium dicitrato bismuthate 240mg twice a day and amoxicillin 500mg four times a day, metronidazole 250mg thrice a day for 2 weeks, nizatidine for 8 weeks(treatment group Ⅱ). H. pylori was eradicated in 53% of treatment group Ⅰ, 100% of treatment group Ⅱ, none of control group after 8 weeks of treatment. Helicobacter pylori infection is recurred in 63% of of treatment group Ⅰ and 15% of treatment group Ⅱ. Side effects were recorded in 3 patients(2 patients on treatment group Ⅱ, 1 patient on treatment group Ⅰ), but it were minor side effects. No patients on treatment groups recurred peptic ulcer disease, while 5 patients on control group. Anti-H. pylori antibody IgG remained constant in bacteria positive control group, but in patients in whom H. pylori had been eradicated serum antibody titers fell significantly at 6 months of treatment. In conclusion, triple therapy including a low dose metronidazole with nizatidine is effective on the eradication of Helicobacter pylori infection and reduced the rate of side effects. Bisthmus and amoxicillin with nizatidine is not effective on the eradication and the recurrence of Helicobactor pylori infection. Serologic tests for H. pylori are reliable means of monitoring success of eradication of H. pylori.

제2형 당뇨병 환자에서 체내 총항산화능 측정의 의의

윤여일,윤석기,김선규,김용현,남일송,차건영,황의원,김영선 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background: The diabetic patients are at significantly increased risk of developing vascular disease. It's etiology may involve oxidative damage by free radiacals and protection againse such damage can be offered by antioxidants. We investigated that oxidative stress as assessed by measurement of total antioxidant status may play a role in development of diabetes mellitus. Method: We measured total antioxiant status using merchandised kit, glycated hemeglobin(HbA1c) in 46 type 2 diabetes mellitus patients and 50 healthy matched control subjects. Result: The total antioxidant status(TAS) was 2.10(±0.04) mmol/L in uncontrolled type 2 DM patients, 2.60(±0.03) in controlled type 2 DM patients and 2.70(±0.16) in healthy control subjects. TAS was significantly lower(P<0.05) in uncontrolled type 2 DM patients, but no significant association between in controlled type 2 DM patients and healthy control subjects. The TAS was 2.00(±0.17) mmol/L in complicated type 2 DM patients and 2.10(±0.29) uncomplicated type 2 DM patients. There was no significant associations between complicated type 2 DM patients and uncomplicated type 2 DM patients. Conclusion: Poor glycemic control is associated with reduced TAS in type 2 DM patients. TAS was thought indirect index that predict glycemic control of type 2 DM patients.

이란산 흑석류 농축액과 그 제품의 성분 및 함유된 Phyto 에스트로겐류에 관한 연구

최원균,정교순,조규성,황명오,유영숙 한국식품영양학회 2002 韓國食品營養學會誌 Vol.15 No.2

천연 호르몬 보충 제제의 개발을 위한 기초 연구로 이란산 흑석류 과즙 농축액과 이를 이용한 제품의 화학성분들을 분석하였다. 석류 농축액의 일반성분은 수분 39.3%, 조지방 0.4%, 조단백질 0.9%, 조회분 1.4%, 그리고 탄수화물은 42.0%이었다. 아미노산 함량은 글루탐산이 1310.Oppm, 아스파르트산이 896.2ppm, 아르기닌이 877.7ppm, 페닐알라닌이 57.5ppm순으필 무기 성분들은 철분 6640.Oppm, 염소 3464.Oppm, 칼륨 2550.8ppm, 인 150.Oppm, 칼슘 80.Oppm 순으로 많이 함유되 어 있었다 비타민은 5가지의 수용성 비타민이 함유되어 있었으며 그 중 비타민 C(20mg/100g)를 제외한 나머지 비타민들이 아주 적은 양이 있었다. 주요 지방산은 palmitic acid(8.3%)와 stearic acid(69.4%)로 전체 지방산의 약 60~80%를 차지하고 있었다. 또한 6종의 phyto및 에스트로겐류가 들어 있었으며 각각daidzein 23.72ppm, quercetin 9,75ppm, catechin 1.48ppm, genistein 0.29ppm, 2,3-di-MeO-estradiol이 0.04ppm, 그리고 17β-에스츠라디올이 0.15ppm이 함유되어 있었다. 이상의 결과들을 석류 농축액으로 제조한 제품 포에버 120과 칡과 대두 isoflavon 농축분말과 비교하다. Phytoestrogens are non-steroidal compounds found in a variety of plants, which exert estrogenic effects in animals. In this study, the physico-chemical properties of Iranian black pomegranate extract and its products as preliminarily research for the developing of natural estrogen supplement were evaluated. The chemical components of Iranian black pomegranate extracts and its product (Forever 120) were analyzed. Proximate compositions of pomegranate extracts were as follows; crude lipid 0.4%, crude protein 0.9%, crude ash 1.4% and carbohydrate 42.0%. Major amino acids of pomegranate extracts are glutamic acid (1310.Oppm), aspartic acid (896.2ppm), arginine (877.7ppm) and phenylalanine (57.5ppm). Fatty acid compositions of pomegranate extract lipid extracted by chloroform-methanol (2:1) were myristic (13.1%), stearic (69.4), oleic acid (6.8%) and palmitic acid (8.3%). Mineral elements were ferrous (6640.Oppm) and potassium (2550.8ppm). Vitamins were composed of ascorbic acid(20.Omg/100g), Vit. B_1 (0.12mg/100g) and niacin (0.80mg/100g), 20 phytoestrogens and 20 estrogens of pomegranate extracts were detected Daidzein (0.29ppm), quercetin (9.75ppm) genistein (0.29ppm) and 17 β-estradiol(0.15ppm). Above the chemical components of pomegranate extracts were compared with that of pome granate its product or other isoflavon concentrates.

대간간학회지 제6차 춘계학술대회 초록집 : 구연 ; 동결간세포의 기능평가

황성규 ( Hwang Seong Gyu ),홍창권 ( Hong Chang Gwon ),오성욱 ( O Seong Ug ),이준성 ( Lee Jun Seong ),김경철 ( Kim Gyeong Cheol ),홍성표 ( Hong Seong Pyo ),박필원 ( Park Pil Won ),임규성 ( Im Gyu Seong ) 대한간학회 2000 Clinical and Molecular Hepatology(대한간학회지) Vol.6 No.1(S)