영구동토 급속안정화를 위한 롤타입강재매트의 모델링과 해석(I)

문도영(Do Young Moon),강재모(Jae Mo Kang),이장근(Janggeun Lee),이상윤(Sang Yoon Lee),지광습(Goangseuo Zi) 한국지반신소재학회 2014 한국지반신소재학회 논문집 Vol.13 No.4

본 논문에서는 표준트럭하중을 받는 연약지반에 놓인 롤타입 강재매트의 모델링과 해석을 수행하였다. 롤 타입 강재매트는 접근성이 제한된 동토지역에서 손쉬운 현장운반을 위해 원형으로 접을 수 있는 강재매트를 의미하며, 동토지반의 융해로 형성되는 연약지반을 통과하는 비포장도로의 급속보강을 위해 개발되었다. 해석 모델은 강재매트 연결부의 비선형적 거동특성을 모사할 수 있는 연결요소, 강재매트의 휨강성을 갖는 쉘요소, 지반특성을 고려한 스프링 구속으로 구성된다. 또한 각 해석요소들의 구조적 거동은 각 모델링 단계에서 실험과 해석을 통해 검증되었다. 링크요소가 없는 빔과 쉘 요소해석이 수행되었으며, 본 연구에서 제시된 해석모델의 결과와 비교하였다. 해석결과, 본 연결부를 고려한 쉘 해석모델의 수직 처짐 결과가 다른 모델에 비하여 상당히 큰 것으로 확인되었다. 따라서, 느슨한 모래지반에 놓인 롤 타입 강재매트의 해석모델은 면밀한 변수해석 연구에 근거하여야 함을 알 수 있다. Finite element modelling and analysis were conducted for the roll-type steel mats which were placed on loose sand and subjected to a standard truck wheel load in this study. The roll-type steel mats mean that the steel mats can be folded as a circle shape for the carrying to fields in cold regions where workability is limited and are developed for a rapid rehabilitation method for roadway across soft ground which is caused by thawing during the summer season in cold regions. The model is composed of link elements to simulate nonlinear behavior of connections between steel mats, thick shell elements to have flexural stiffness of the steel mats, and springs to simulate characteristics of foundation soils. The structural behaviors of the shell, link elements, and springs were verified at each modelling step through experiment and analysis. Beam and shell analysis without the link elements were conducted and compared to results obtained from the model presented in this study. Significant vertical displacement is shown in the shell model with hinge connections. Therefore, the results demonstrate that the analysis model for the roll-type steel mats on loose sand needs further detail parametric studies.

마늘 및 유자 물 추출물의 투여가 Streptozotocin 유발 당뇨 쥐에서 혈당 강하와 지질개선에 미치는 영향

강재란,강민정,김동규,신정혜 한국식품영양과학회 2020 한국식품영양과학회지 Vol.49 No.1

Streptozotocin을 통해 당뇨 유발 후 4주 동안 마늘 및 유자 물 추출물을 경구 투여한 흰쥐의 혈당 강하 및 지질개선 효과를 검증하였다. 경구 당부하능은 당뇨 대조군(DC군)과 비교하여 마늘 물 추출물 급이군(GFD군)과 유자 물 추출물 급이군(CFD군)의 혈당이 공복 시 수준으로 더 빠르게 감소하였다. 혈당은 GFD군과 CFD군에서 실험기간이 경과할수록 감소하였다. 실험동물의 혈청 및 간조직의 지질 함량은 GFD군과 CFD군이 DC군보다 낮았다. 간기능 지표인 ALP 활성은 GFD군과 CFD군이 DC군보다 유의적으로 낮았고, AST 활성은 GFD군이 DC군과 CFD군에 비해 낮았다. 신장기능 지표(BUN 및 LDH)는 GFD군과 CFD군이 DC군보다 유의적으로 낮았다. TBARS법을 통해 혈청 및 간조직의 지질과산화물을 측정한 결과 정상대조군(NC군)보다 DC군이 유의적으로 높고, GFD군과 CFD군은 DC군보다 유의적으로 낮았다. 혈청의 항산화 활성은 GFD군과 CFD군이 DC군보다 유의하게 높았으나 간조직의 항산화 활성은 모든 실험군 간에 차이가 없었다. 본 연구 결과들을 종합해보면 마늘 물 추출물과 유자 물 추출물을 당뇨가 유발된 쥐에게 투여하는 것은 당뇨 유도로 증가하는 혈당을 효과적으로 감소시키며 부가적으로 당뇨 합병증으로 증가하는 체내 지질을 감소시키는 효과도 있는 것으로 판단된다. This study examined the effects of garlic (Allium sativum L.) and yuza (Citrus junos) extract on blood glucose lowering and lipid improvement in streptozotocin-induced diabetic rats. As a result of an oral glucose tolerance test, the blood glucose level of the GFD (garlic water extract feed diabetic) group and CFD (yuza water extract feed diabetic) group decreased more rapidly to the fasting glucose level than the DC (diabetic control) group. The blood glucose of the DC group remained constant during the experiment period, whereas the GFD and CFD groups decreased gradually. The serum and liver-tissue lipid contents were lower in the GFD and CFD groups than the DC group. In the liver function indices, the ALP activities of the GFD and CFD groups were significantly lower than the DC group. The AST activity of the GFD group was lower than that of the DC and CFD groups. The BUN and LDH activities, which are a kidney function index, were significantly lower in the GFD and CFD groups than the DC group. The TBARS contents of the serum and liver tissue were significantly higher in the order DC> GFD and CFD> NC. The antioxidant activity of the serum was significantly higher in the GFD and CFD groups than the DC group, but the activity of liver tissues was similar in all the experimental groups. These results suggest that the administration of garlic and yuza water extracts to diabetic rats effectively reduces the blood glucose level. In addition, garlic and yuza water extracts help reduce the body lipid level.

시도 의회와 시군구 의회의 관계

강재호(姜再鎬) 한국지방정부학회 2003 지방정부연구 Vol.7 No.3

용매별 초석잠 추출물의 항산화 및 항당뇨 활성

강재란,강민정,신지현,박지혜,김동일,정상용,신정혜,Kang, Jae-Ran,Kang, Min-Jung,Shin, Ji-Hyeon,Park, Ji-Hye,Kim, Dong-il,Chung, Sang-Yong,Shin, Jung-Hye 한국식품저장유통학회 2017 Food Science and Preservation Vol.24 No.5

This study investigated the antioxidant and antidiabetic activities of Stachys sieboldii Miq. extracts by solvents (water, ethanol, butanol, chloroform, and hexane). The contents of total polyphenols (7.18-37.25 mg/g) and flavonoids (0.21-5.21 mg/g) in extracts from Stachys sieboldii Miq. showed a significant difference dependent on the extraction solvents, butanol > ethanol > water > chloroform > hexane. Antioxidant activities by DPPH and ABTS radical scavenging were increased in a dose-dependent manner. These activity trends associated with the extraction solvent were different at each concentration, but resembled phenolic compound contents trend, generally. FRAP value increased in a dose-dependent manner, but there was a difference in radical scavenging activities when comparing between extraction solvents by butanol > ethanol > hexane > chloroform > water on all concentrations. The trend of ${\alpha}$-amylase inhibition of extracts from $1,000{\mu}g/mL$ to $2,000{\mu}g/mL$ was not affected as enzyme activity is promoted and not inhibited. The inhibition of ${\alpha}$-glucosidase was increased in a dose-dependent manner without water extracts, the activity on hexane extracts was higher than others per the extraction solvent. ${\alpha}$-Glucosidase inhibition of hexane extracts showed 57.76% at $250{\mu}g/mL$, which is 2.8 times higher than the second highest chloroform extract (20.65%). From these results, we presume that the active ingredients of Stachys sieboldii Miq. is different according to the extraction solvent and also the activity is different by these major functional groups.

청소년의 기질, 양육태도와 학교적응과의 관계에서 성격강점의 매개 및 조절효과

강재란,안미순,박양균 한국청소년학회 2014 청소년학연구 Vol.21 No.10

The purpose of this study was to try to apply Lyubomirsy's(2005) 'sustainable happiness model ' on the relationship among the temperament, parental attitude, and character strengths affecting school adjustment of middle school students. The mediating effects of character strengths on the relationship between parental attitude and school adjustment were about the moderating effects of character strengths on the relationship between temperament and school adjustment. The subjects in this study were 340 middle school students in Seoul, Incheon and Gyeonggi Province, on whom a survey was conducted. The answer sheets from 326 respondents were analyzed, and a hierarchical regression analysis was made to determine the impact of temperament and parental attitude on school adjustment. The findings of the study were as follows:A positive parental attitude exerted a direct influence on school adjustment, and character strengths had partial mediating effects on the relationship between the two. Namely, it could be interpreted that the adolescents whose parents took a more positive parental attitude were better at school adjustment, that the teens who had more character strengths were better at school adjustment, and that a positive parental attitude served to bolster character strengths. Among the subfactors of temperament, novelty seeking had a negative impact on school adjustment, and character strengths served to boost school adjustment by moderating temperament. In other words, the temperament of novelty seeking weakened school adjustment, and more character strengths could be said to lead to better school adjustment. In conclusion, the kind of programs or counseling strategies that could foster and reinforce character strengths should be introduced in school education, counseling and parent education. Conforming to this result, this study discussed the consultative undertone, limitations of the study, and proposals for future studies. 본 연구에서는 중학생들의 학교적응에 영향을 주는 기질과 부모양육태도, 성격강점의 관계를 Lyubomirsy(2005)의 ‘지속가능한 행복모델’에 적용하여 알아보고자 하였다. 부모양육태도와 학교적응과의 관계에서 성격강점의 매개효과와 기질이 학교적응에 미치는 영향력을 성격강점이 조절하는가 확인하였다. 서울, 인천, 경기지역의 중학생 340명 대상으로 설문을 실시하였으며, 이중 326명의 응답이 분석되었다. 청소년의 기질과 부모양육태도가 학교적응에 미치는 영향을 확인하기 위해 위계적 회귀분석을 사용하였다. 성격강점이 긍정양육태도와 학교적응과의 관계를 부분매개 하였고, 기질이 학교적응에 미치는 영향을 성격강점이 조절하는 것으로 나타났다. 자극추구의 기질적 측면이 학교적응을 낮아지게 하는데 성격강점이 많을수록 학교적응을 높인다고 볼 수 있다. 성격강점 개발 및 촉진과 관련한 프로그램의 활성화, 상담기법 및 전략 확대 등이 필요하다. 이러한 결과에 따른 상담적 함의, 연구의 제한점, 추후 연구에 대한 제언을 논의하였다.

大會辭

姜在哲(강재철) 비교민속학회 2004 비교민속학 Vol.0 No.27

천연소재로부터 분리한 색소분말과 혼합물의 생리활성

강재란,강민정,심혜진,최명효,신정혜 한국식품저장유통학회 2016 Food Science and Preservation Vol.23 No.1

Seven kinds (acacia, cochineal, catechu, grape peel, persimmon, gallnut and clove) of color powders obtained from natural resources and their mixtures were evaluated for their biological activities, such as antioxidant (ABTS and DPPH radicals scavenging), cholesterol absorption, and COX-2 inhibitory activities. Catechu, gallnut and clove were selected for the further studies due to its the best activities. The cholesterol absorption, COX-2 inhibitory, α-amylase inhibitory and α-glucosidase inhibitory activities were measured using the mixtures of catechu, gallnut and clove. The ABTS radical scavenging activity of the seven types of natural color powders were higher than the DPPH radical scavenging activity. The cholesterol absorption activity was significantly higher in cloves. The COX-2 inhibitory activity was significantly lower in acacia. The α-amylase inhibitory activity was higher in catechu and gallnut, indicating that there were no significant difference between two mixtures. The α-glucosidase inhibitory activity was the highest in catechu, which was higher than that of the catechu-containing mixtures. From all these results, a synergistic effect could be obtained when utilizing a mixture of powders rather than using only individual type. Since the activity of each powder was different, further studies will be required for clarifying the interactions between mixtures.

大會辭

姜在哲(강재철) 비교민속학회 2001 비교민속학 Vol.21 No.-

大會辭

姜在哲(강재철) 비교민속학회 2003 비교민속학 Vol.25 No.-

인천학문헌서지①

강재호(康在鎬) 새얼문화재단 1995 황해문화 Vol.8 No.-