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전자기력에 의한 연주 Slab 내의 교반유동에 관한 수치적 연구
이재헌,이성우,신영길,김희창 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.1
A Numerical study was performed for the two-dimensional turbulent stirring flow created by linear motor in a continuous casting system. A k-εturbulent model was applied to solve time-averaged turbulent momentum equations within the computation domain. Four different situations in a stirring system being consisted of two-dimensional slab of 1 m(width) × 0.2 m(height) have been investigated, that is : Model (A) : W =0.1 m and B_0=0.01 tesla, Model (B) : W =0.3 m and B_0=0.01 tesla, Model (C) : W =0.1 m and B_0=0.02 tesla, Model (D) : W =0.3 m and B_0=0.02 tesla, where W is the length of linear motor and B_0 is the magnetic flux applied on the motor-side-surface of the slab. The results shows that the flow characteristics depends mainly on the magnetude of B_0 not on W. The order of the magnitudes of turbulent intensity at four flow situations were almost same. However, the magnitude of turbulent viscosity became much less in case of greater B_0 than in smaller B_0. Therefore it is recommended that the stirrer with greater B_0 should be used to make finer stirring action.
Db/db 마우스 모델에 있어서 한약재조성물의 혈당 및 혈장 콜레스테롤 개선효과
이재헌,조창우,한상복,황지연,강민정,주희정,김미은,서영주,김정인 한국약용작물학회 2008 한국약용작물학회지 Vol.16 No.4
흰양삼, 황기, 감초, 구기자, 뽕나무잎, 갈근, 하고초, 오갈피,오미자, 황금, 산약, 황정, 작약, 생지를 1 : 0.7 : 0.4 : 0.7 : 0.4 :0.7 : 1.1 : 0.9 : 0.4 : 0.4 : 0.7 : 0.7 : 0.9 : 0.9의 비율로 함유한 한약재 조성물의 혈당 및 지질대사 개선효과를 제2형 당뇨동물 모델인 db/db 마우스에 있어서 조사하였다. In vitro에서 한약 재조성물 메탄올 추출물의 α-glucosidase 저해활성을 측정한 결과, 경구 혈당강하제로 사용중인 아카보스 (20.7%)에 비해 높은 저해활성 (25.2%)을 나타내었다. 4주령의 수컷 db/db 마우스 (C57BL/KsJ, n = 14)를 1주간의 적응기간이 지난 후 2군으로 나누어 대조군에게는 AIN-93G diet를 기본으로 한 basal diet를, 실험군에게는 동결건조된 한약재조성물 가루를 식이의 10% 수준으로 함유한 식이를 6주간 제공하였다. 한약 재조성물의 섭취는 실험동물의 체중 및 식이 섭취량에 유의적인 영향을 주지 않았으나 공복 혈당 (442.5 ± 36.0mg/dL)을 대조군 (489.8 ± 34.6mg/dL)에 비해 유의적으로 감소시켰다 (p 〈 0.05). 또한 한약재조성물 섭취군의 혈장 콜레스테롤 (159.2 ± 18.4mg/dL) 농도는 대조군 (185.4 ± 13.7mg/dL)에 비해 유의적으로 감소하였으며 (p 〈 0.05), 혈장 중성지방 농도는 한약재 조성물 섭취군 (99.4 ± 15.0mg/dL)이 대조군 (108.8 ±11.0mg/dL)에 비해 낮아지는 경향을 나타내었다. 따라서 한약 재조성물의 섭취는 당뇨동물모델에 있어서 혈당 및 혈장 콜레스테롤 농도를 감소시켜, 당뇨병 개선 및 당뇨합병증 예방에 기여할 것으로 사료된다. Diabetes mellitus is the fifth leading cause of death among Koreans. Control of hyperglycemia and dyslipidemia is strongly correlated with decrease in risks for cardiovascular diseases, the most common and fatal diabetic complication. The effects of chronic feeding of a mixture of Chinese herbs on blood lipid profile were measured in an animal model of type 2 diabetes mellitus, db/db mice (C57BL/Ks). The Chinese herb mixture was composed of Panax ginseng C. A. Meyer,Astragalus membranaceus, Glycyrrhiza uralensis, Lycium chinense, Morus, Pueraria thunbergiana, Prunella vulgaris var. lilacina, Acanthopanax sessiliflorus, Schizandra chinensis, Scutellaria baicalensis, Dioscorea batatas, Polygonatum doratumvar. pluriflorum, Paeonia lactiflora, and Rehmannia glutinosa in a ratio of 1 : 0.7 : 0.4 : 0.7 :0.4 : 0.7 : 1.1 : 0.9 : 0.4 : 0.4 : 0.7 :0.7 : 0.9 : 0.9. Methanol extract of the Chinese herb mixture was tested for the inhibitory activity against yeast α-glucosidase in vitro. The Chinese herb mixture extract inhibited α-glucosidase by 25.2% at the concentration of 0.5mg/mL. Four weekold male db/db mice (n = 14) were fed AIN-93G semipurified diet or diet containing 10% powder of the Chinese herb mixture for 6 weeks after 1 week of adaptation period. Body weight (39.5 ± 1.6 g) and food intake (4.3 ± 0.6 g/day) of the Chinese herb group were not significantly different from those of the control group (40.4 ± 2.6 g and 4.5 ± 0.6 g/day). Consumption of Chinese herb mixture significantly decreased plasma glucose level (442.5 ± 36.0mg/dL) compared with the control group (489.8 ± 34.6 mg/dL, p 〈 0.05). Plasma cholesterol level (159.2 ± 18.4 mg/dL) of the Chinese herb group was significantly lower than that of the control group (185.4 ± 13.7 mg/dL, p 〈 0.05). Blood glycated hemoglobin (6.3 ± 0.8%) and plasma triglyceride levels (99.4 ± 15.0mg/dL) of the Chinese herb group were not significantly different from those of the control group (6.7 ± 0.7% and 108.8 ± 11.0mg/dL). Thus, the Chinese herb mixture could be useful in the treatment of diabetes and cardiovascular complications of diabetes.
이재헌,박명식 대한기계학회 1993 대한기계학회논문집 Vol.17 No.8
A numerical investigation has been carried out for the flow characteristics after exchange of some filters from the original layer to the new low pressure loss layer with equal filtering efficiency. The solution domain includes upper plenum, filter layer, clean space, access panels, and lower plenum. The concept of the distributed pressure resistance was applied to describe the momentum loss in filter layer and access panels. The evolution of the flow field is simulated using the low Reynolds number k-.epsilon. over bar turbulent model and SIMPLE algorithm based on the finite volume method. As a result, after the exchange of filter layer the power requirement can be reduced by 8-9 percent. The results also demonstrate that the perpendicularity of the flow near access panels may become worse at new filter layer than origianl filter layer. But the situation can be recovered by adjusting the jopening ratio of access panels.
The Cosmic Equality and the Philosophy of Familial Harmony in Kumkangdaedo
이재헌,박현숙 한국신종교학회 2010 신종교연구 Vol.22 No.-
Kumkangdaedo, a new religion believing in Kunkonbumo’s advent in the world as a savior, claims for the advent of Ojungundo temporally. Ojung indicates the transition between the prior world(Sunchun) and the latter world(Huchun), and is the period of the most brilliant brightness, of equality, and of peace in which Sanggeuk is turned into Sangsaeng. This philosophy of Ojung-Equality can be interpreted into various meanings;First it means the equality between heaven and earth; Second, it means the equality between heaven/earth and humans; Third, it means the equality of all mankind. Fourth, it means the equality between man and all creation;Fifth, the equality between life and death. It not only teaches us that Heaven and Earth, man, and all creation should live together as partners, but also calls for practicing non-violent culture and respect for life. The philosophy of ‘Cosmic familial harmony’ through the faith for Kunkonbumo in Kumkangdaedo provides us with necessary ecological spirituality by creatively subliming the organic and monoist Oriental view of world. On the other hand, Kumkangdaedo’s theory of the union of the three teachings, Confucianism, Buddhism, and Taosim, presents a view of tolerance and harmony for other religions in this period of religious pluralism in which the reconciliation among religions are desperately needed. The world today requires us to overcome our individual particularities and to make efforts toward the common goals, the survival and prosperity of mankind with the consciousness of the fact that all of us are members of one global village. For this, it is necessary to escape from the hierarchical structure of unilateral ruling and oppression and hence to shift our recognition to the fact that each existence is dependent on and organically related to others. In this respect, we want to get possibilities and clues for radically change our forms of life from Kumkangdaedo’s cosmic equality and spirit of Gahwa, and hope that this will be developed into concrete practical movements by achieving universality within the philosophies of Korea and East Asia.