소성시간에 따른 재생시멘트의 물성 평가

임승준,김세훈,오상균,김정길,강병희 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

Serious problems of the environment protection and resource exhaustion are exhibited, due to the increase of the construction materials and activation of the remodeling, recently. Especially, most of the advanced countries, recycling plan for the waste concrete is vigorously progressing. The recycle of domestic waste concrete is, however, still in an early stage, and it has been only partially being used for the road fillers. As a counter-plan of activating recycled concrete, we have confirmed the hydration possibility of the waste concrete powder from the experiment on recycling the aggregate powder since 2000. Also, we have known that the strength is increasing when the heating time is longer, and baking temperature maintain in 700℃. The purpose of this study is to determine the most suitable production method controlling the duration of baking time for recycled cement from the compressive strength, X -ray diffraction and ingredient analysis test.

각종 소화성질환에서의 Campylobacter Pylori의 검출에 관하여

허정욱,강영우,박준호,박승국,하경임,김재룡,안성훈,박선우 啓明大學校 醫科大學 1988 계명의대학술지 Vol.7 No.2

Peptic disorders are among the most common maladies in korea as the world. In most cases their etiologies not be established and their pathophysioolgy remain obscure. Although the persence of fastric bacteria has been logn established, recently campylobacter pylori seems to be etiologic agent of peptic disorders. Campylobacter pylori is visualized in most cases of peptic disorders and not visualized after treatment of bctericidal agents, bismuth compound or metronidazole. We had a following results for identification of campylocacter pylori in stomach and duodenal mcuosa via endoscipc biopsy. 1. We studied 54 patients who had dyspeptic symptoms, 29 males. 2. Most patients are in 5th decades, next in 3rd and 6th in order. 3. Ptients were composed of 27 peptic ulcer, 22 gastitis and 5 gastric carcinoma. 4. Campylobacter pylori was identified in 69% of total patients, peptic ulcer 63%, gastritis 77%, stomach carcinoma leastly.

한국인의 신장과 간장조직내 카드뮴함유량의 참고치

박정덕,최병선,권일훈,홍연표,장임원 大韓産業醫學會 2000 대한직업환경의학회지 Vol.12 No.3

목 적 : 카드뮴은 인체의 물질대사에는 불필요하며 사람에게 발암작용이 있는 유해금속 물질로서체 내에서 축적되는 경향이 있다. 신장과 간장은 카드뮴의 주요 축적 장기로서 일반 인구집단에서 생활환경을 통해 미량의 카드윰에 만성적으로 폭로량을 가장 잘 반영한다. 방 법 : 이번 연구에서는 특별히 카드윰에 폭로된 적이 없는 0∼87세 범위의 부검체 254예(남자:188예, 여자 : 66예)를 대상으로 신장피질과 간장조직내 카드윰량을 분석하여 한국인에 있어서 신장과 간장내 카드윰 함유량의 참고치를 제시하였고, 체내카드뮴 총 부하량을 추정하였다. 결 과 : 한국인의 신장피질과 간장내 카드윰 농도의 기하평균치는 각각 27.4 ㎍/g wet weight와 3.1 ㎍/g wet weight 이었고, 아연의 기하평균치는 신장피질 35.4 ㎍/g wet weight, 간장 42.6 ㎍/g wet weight 이었다. 신장피질내 카드윰 축적량은 간장의 약 9배로서 미량 만성적 폭로시 신장이 주요 축적장기이었다. 한국인에 있어서 연령에 따른 신장피질내 카드윰 축적량은 50대 까지는 증가하다가 이후 감소되는 양상을 나타내었다. 신장피질내 카드뮴 축적량과 연령과는 2차 함수적인 관계를 나타내어 연령별 신장피질내 카드윰 축적량을 추정할 수 있는 예측식이 Log KCd=0.2325+0.0553 · Age-0.0005 · Age2으로 산출되어, 한국인에 있어 신장피질내 카드윰 축적량의 최고 농도는 50.8세에서 43.4 ㎍/g wet weight로 추정되었다. 또한, 신장 피질과 간장내 카드윰 축적량으로부터 산출된 연령에 따른 체내 카드윰 총 부하량의 예측식이 Total Cd Body Burden=-4.5948+1.2278 · Age-0.0121 · Age2로 산출되어, 체내 카드윰 총 부하량은 50.7 세에서 가장 높았으며 이때 26.5mg의 카드뮴이 체내에 축적되는 것으로 추정되었다. 신장피질과 간장에서 아연과 카드윰은 양의 상관이 있어 각각 Log KZn=1.1410+0.2841· Log KCd, Log LBn=1.5016+0.2396 · Log LCd 의 직선회귀관계가 성립되었으며, Cu/Zn비는 조직내 연령별 카드뮴농도와 비슷한 양상을 나타내었다. 결 론 : 이상의 결과에서 나타난 한국인의 카드뮴 폭로량은 일본인에 비해서는 낮았으나, 미국이나 서구지역에 비해서는 비슷하거나 다소 높은 수준으로 평가되었다. Objectives : Cadmium (Cd), a toxic and non-essential metal, is recognized as a human carcinogen, which has a tendency to accumulate In the human body. The levels of Cd in renal cortex and liver are good indicators as an index of Cd exposure in the general popelation. In this study, we present an estimation of reference Cd levels in tissue (renal cortex and liver) and total body burden in the general population of Korea. Methods : Cd and zinc (Zn) were analyzed in renal cortex and liver from 254 autopsies(male : 188 cases, female : 66 cases) aged 0 to 87 years. Results : Geometric mean concentration of Cd was 27.4 and 3.1 ㎍/g wet weight in renal cortex and liver, respectively. The level of Zn in renal cortex and liver was 35.4 and 42.6 ㎍/g wet weight, respectively. The result suggests that kidney is the target organ for Cd accumulation. The accumulation of Cd in renal cortex was age-dependent with a biphasic pattern. The level of Cd in renal cortex increased with age up to the fifties, and then level설 off thereafter. Based on the data, the regression model for Cd accumulation In renal cortex by age is predicted by : Log KCd = 0.2325 + 0.0553 · Age -0.0005 · Age2. The highest Cd accumulation in renal cortex of Koreans was estimated at 43.3 ㎍/g wet weight at 50.8 years old. In addition, the total Cd body burden by age was estimated by the fellowing equation'Total Cd Body Burden = -4.5948 + 1.2278 · Age - 0.0121 Age2. The highest body burden of Cd was estimated at 26.5 mg at age 50.7 years in the Korean general population. The positive correlation between Zn and Cd was observed In renal cortex and liver. Conclusions The level of Cd exposure in Korean was found to be lower than In Japanese, but same as or higher than in American and Europeans.

한국인의 심근 조직내 카드뮴 농도의 참고치

박정덕,임헌방,최병선,권일훈,이상연,강은용,홍연표,장임원 大韓産業醫學會 1999 대한직업환경의학회지 Vol.11 No.1

Cadmium(Cd) is an ubiquitous, toxic and nonessential metal which is controversial about the association with a cardiovascular disease. In this study, we investigated the reference level of Cd in myocardium in Korean general population. The level of Cd and zinc(Zn) concentration in myocardium of 252 cases of "sudden and unexpected death" autopsies (male: 172, female : 60) aged 0 to 87 years was analyzed. The concentration of Cd and Zn was determined with atomic absorption spectrophotometer(Perkin-Elmer Model 5100) by flameless and flame method, respectively. The content of Cd and Zn in myocardium showed the log-normal distribution rather than normal distribution. Geometric mean concentration of Cd was 0.19 ㎍/g wet weight in myocardium. The level of Cd in myocardium was not significantly different between male (0.18㎍/g wet weight) and female (0.22㎍/g wet weight). Geometric mean concentration of Zn in myocardium was 25.25 ㎍/g wet weight. The level of Zn between male (25.13 ㎍/g wet weight) and female (25.57㎍/g wet weight) was not different. The deposit of Cd in myocardium was age-dependent of biphasic pattern, but the Zn level by age was not significantly different. The level of Cd in myocardium was increased to the fifties of age, thereafter a leveling-off was shown. The regression model of Cd deposit in myocardium by age was predicted as the following equation: Log Heart-Cd= -1.2726 + 0.0234 ·Age -0.0002 ·Age². The maximum Cd deposit in myocardium was estimated to be 0.26 ㎍/g wet weight at the age of 58.5 in Korean general population. In addition, the total Cd burden in heart by age was predicted as a following equation: Total Cd burden in Heart= -10.165+2.891 ·Age -0.0258 ·Age². The maximum heart burden of Cd was estimated to be 70.7㎍ at age of 55.4. The positive correlation between Cd and Zn was observed in myocardium. The linear regression equation was Log Heart-Zn = 1.4195+0.0262 ·Log Heart-Cd.

초음속 배기노즐의 공력음향과 유동특성

이동훈,임정빈 서울産業大學校 2000 논문집 Vol.51 No.2

This paper describes the experimental results for the flow characteristics and the aeroacoustics of a perforated tube attached at the exit plane of a circular convergent nozzle. The experimental results for the near and far field sound, the visualization of jet structures and the static pressure distributions in the jet passing through a perforated tube are presented and discussed in comparison with those for a simple tube. The perforated tube has a good performance to suppress the shock-associated noise as well as the turbulent mixing noise. This noise suppression is due to the modification and the elimination of shock waves in a jet plume that depend upon the porosity of a perforated tube. The pressure relief caused by the high-speed jets through holes on the tube results in the transformation of normal shock waves into weak shock waves like Mach wave.

인진사령산이 肝細胞活性, 細胞週期 및 Fas-mediated apoptosis에 미치는 影響

禹弘楨,李長勳,表林靜 慶熙大學校韓醫科大學韓醫學硏究所 1999 慶熙韓醫大論文集 Vol.22 No.1

To evaluate the effects of Injinsaryungsan on cell viability, cell cycle progression, and Fas-mediated apotosis, MTT assay, cell cycle analysis, PCNA expression analysis and tryphan blue exclusion assay, flow cytometry, Cpp32 protease assay, DNA fragmemtation assay were performed. And for quantitative evaluation of gene expression, we performed RT-PCR. The results were as followed. 1. In MTT assay, Injinsaryungsan treatment increases cellular viability of the cells and this increase showed strong correlation with the treatment doses of Injinsaryungsan. 2. Cell cycle analysis showed a significant reduction of G₁phase, and PCNA analysis showed that cell cycle progression of the HepG2 cells is positively regulated by Injinsaryungsan. And a dosage-and time-dependent induction of PCNA expression was recognized. 3. Using tryphan blue exclusion, flow cytometric analysis of sub G₁phase, a significant and dosage-dependent reduction of apoptosis were observed in Injinsaryungsan-treated cells compared to untreated control cells. 4. DNA fragmentation assay showed significantly reduction of DNA fragmentation in Injinsaryungsan-treated cells, decreases of CPP32 protease activities were observed in CPP32 protease assay. Which indicates that Injinsaryungsan carry inhibitory effects on apoptosis. 5. A quantitative RT-PCR analysis demonstrated that Fas and CPP32 mRNA expression were dramatically reduced and Bcl-2, Bcl-X?? mRNA expression were induced by the treatment of Injinsaryungsan while expression of Fadd, Fap-1, and ICE were not affected by Injinsaryungsan. These results implies that Injinsaryungsan increase hepatocyte viability, cell cycle progression and protect hepatocyte from damage by regulating the expression of genes associated with Fas-mediated apoptosis, which explains the mechanism of the clinical effect of Injinsaryungsan on liver diseases.

반복가열냉각에 의한 수화시멘트 페이스트와 골재 분리 방법

김세훈,임승준,안재철,오상균,김정길 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

Cement mortar and efficient disconnection of aggregate are indispensable for recycling of waste concrete, and the problem is with quality in the existing physical disconnection way, and the problem has been by application of a concrete recycling construction materials. Specially, in case of recycled aggregate, the quality is lowered because of the fine aggregate powder which has a bad influence on flowability, a compression strength by adhesion of mortar on the aggregate face, and the case of recycled cement was added to during recycle cement. Therefore, a mortar and interfacial separation of aggregate are large in proper quality for concrete recycling is expected that affect. This study based on the recycled cement manufacturing way which used an aggregate interfacial separation of waste mortar in this study so that the coefficient of thermal expansion of hardend cement paste and an the coefficient of thermal expansion of a fine aggregate are different in a recycled cement manufacturing way, but leaves a purpose.

엘리베이터용 로프 브레이크의 구조해석

이종선,김정훈,박임준 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-

The objective of this study is structural analysis of rope brake for elevator. The finite element model was developed to compute the stress, strain and friction force for rope brake. The ANSYS code was used for this analysis. In order to structural analysis of rope brake, many variables such as internal pressure, boundary condition, load condition and constraints were considered.

ORP profile을 이용한 연속 회분식 반응기(Sequencing Batch Rector)에서 무산소공정 추론

심문용,부경민,임정훈,우혜진,김창원 한국환경과학회 2004 한국환경과학회지 Vol.13 No.3

The SBR(Sequencing Batch Reactor) process is ideally suited to treat high loading wastewater due to its high dilution rate. SBR operates by a cycle of periods consisting of filling, reacting, settling, decanting and idling. The react phases such as aeration or non-aeration, organic oxidation, nitrification, denitrification and other biological reactions can be achieved in a reactor. Although the whole reactions can be achieved in a SBR with time distributing, it is hard to manage the SBR as a normal condition without recognizing a present state. The present state can be observed with nutrient sensors such as NH₄^(-)-N, NO₂^(-)-N, NO₃^(-)-N and PO₄^(3-)-P. However, there is still a disadvantage to use the nutrient sensors because of their high expense and inconvenience to manage. Therefore, it is very useful to use common on-line sensors such as DO, ORP and pH, which are less expensive and more convient. Moreover, the present states and unexpected changes of SBR might be predicted by using of them. This study was conducted to get basic materials for making an inference of SBR process from ORP(oxidation reduction potential) of synthetic wastewater. The profiles of ORP, DO, and pH were under normal nitrification and denitrification were obtained to compare abnormal condition. And also, nitrite and nitrate accumulation were investigated during reaction of SBR. The bending point on ORP profile was not entirely in the low COD/NOx ratio condition. In this case, NOx was not entirely removed, and minimum ORP value was presented over -300mV. Under suitable COD/NOx ratio which complete denitrification was achieved, ORP bending point was observed and minimum ORP value was under -300mV. Under high COD/NOx ratio, ORP bending point was not detected at the first subcycle because of the fast denitrification and minimum ORP value was under -300mV at the time.

랫드에서 미생탕의 4주 반복투여독성

김태명, 류재면, 서임권, 박동선, 조정희, 장용훈, 김윤배, 황석연 충북대학교 동물의학연구소 2009 Journal of Biomedical and Translational Research Vol.10 No.1

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