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김대근,황건,Kim, Dae-Geun,Hwang, Gun 한국수자원학회 2012 한국수자원학회논문집 Vol.45 No.3
댐 붕괴 직후에 댐 붕괴 근역에서의 댐 붕괴파 및 댐 붕괴파로 인한 하상변동을 추적하기 위하여 RANS를 지배방정식으로 하는 FLOW-3D를 이용한 3차원 수치모의를 수행하였다. 특히 이동상에서의 하상변동과 그 하상변동으로 인한 홍수파의 변동을 고정상에서의 해석결과와 비교하였다. 그 해석 결과를 정리하면 다음과 같다. 첫째, L자형 실험수로에서의 홍수파 해석 및 이동상 실험수로에서의 홍수파와 하상변동 해석 결과는 해당 수리실험을 만족스럽게 재현하고 있다. 둘째, 부유사의 농도는 홍수파의 전면에서 가장 높은 값을 보이며, 하상침식은 흐름이 급변하는 댐 직하류 지점에서 가장 크게 발생한다. 수로의 상류에서 발생하는 부유사로 인해 하류에서는 침식과 퇴적이 번갈아서 발생한다. 홍수파가 도달하는 초기에는 L자형 만곡부의 내측에서 침식이 우세하게 발생하나, 시간이 지나며 침식은 점차 만곡부의 외측으로 이동하는 양상을 보인다. 셋째, L자형 이동상에서의 홍수파는 하상의 침식 및 퇴적으로 인해 고정상에서의 홍수파에 비해 그 전파가 지체되며 홍수위가 크게 상승한다. We conducted a three-dimensional numerical simulation by using the FLOW-3D, with RANS as the governing equation, in an effort to track the dam-break wave.immediately after a dam break.in areas surrounding where the dam break took place as well as the bed change caused by the dam-break wave. In particular, we computed the bed change in the movable bed and compared the variation in flood wave induced by the bed change with our analysis results in the fixed bed. The analysis results can be summarized as follows: First, the analysis results on the flood wave in the L-shaped channel and on the flood wave and bed change in the movable-bed channel successfully reproduce the findings of the hydraulic experiment. Second, the concentration of suspended sediment is the highest in the front of the flood wave, and the greatest bed change is observed in the direct downstream of the dam where the water flow changes tremendously. Generated in the upstream of the channel, suspended sediment results in erosion and sedimentation alternately in the downstream region. With the arrival of the flood wave, erosion initially prove predominant in the inner side of the L-shaped bend, but over time, it tends to move gradually toward the outer side of the bend. Third, the flood wave in the L-shaped channel with a movable bed propagates at a slower pace than that in the fixed bed due to the erosion and sedimentation of the bed, leading to a remarkable increase in flood water level.
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김대근,공민근 대한상하수도학회 2003 상하수도학회지 Vol.17 No.6
The flow of domestic wastewater (not including the groundwater infiltration or unavoidable surface water contribution) will vary continuously throughout any one day, with extreme low flows usually occurring during the break of the day and peak Rows occurring during the daylight hours. This study deals with the characteristics of domestic wastewater flow in the small residential area. Especially, this study is mainly focused on the estimate of the ratio of the peak/minimum flow of the domestic component to the average for the day in the small residential area which is useful information for the sewer design and maintenance. In this study, the ratio of the peak flow to the average for the day range about from 1.4 to 2.9 and the ratio of the minimum flow to the average range about from 0.1 to 0.5.
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金大根 건국대학교 1986 論文集 Vol.22 No.1
The Purpose of this paper is to survey mathematical model of overhead cost allocation and to examine their economic meaning and implications. We lave traced historically two approaches to this problems : the matrix model approach and the LP model approach. Capettini and Salamon (1977) presented an example of the decision making necessary to determine whether to continue generating a service internally versus acquiring the service externally. The example demonstrates that the basic data required for a correct solution to this decision problem can be obtained from the information normally presumed to be available when service department costs are allocated to producing departments by the algebraic (simultaneous equations) method. Baker and Taylor (1979) Proposed a LP approach to the external aquisition problems, and demonstrated how to use LP results to compute cost allocation. The mathematical duality in the LP model shows that the problems of optimal allocation and of valuation are inseparable. The problem of allocation is that of finding optimal quanties of service department output (minimize the sum of service department costs), and the problem of evaluation is that of determining the service values (determine allocating cost). The two problems are mathematically identical and are two aspects of the same problem. This would be expected on the basis of usual economic reasoning, but we shall gain important insight in accounting theory, especially in the problem of cost determination. The problem of cost determination is not separable from that of the relevant decision model for optimal resource allocation. This is an illustration of the way in which mathematical reasoning can lead to the discovery of new accounting facts.
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김대근,최상운,류시용,이강노,지옥표 성균관대학교 약학연구소 1998 成均藥硏論文集 Vol.10 No.1
Activity-guided fractionation and repeated column chromatography afforded two cytotoxic compounds R-3 and R-4 from the root of Rumex japonicus HOUTT. Compounds were identified as musizin and emodin, respectively, by the physicochemical and spectral data. Besides R-3 and R-4, two compounds R-1 and R-2, chrysophanol and physcion, respectively, were also isolated. The compound R-3 and R-4 exhibited cytotoxicity against cultured human tumor cell lines. A-549, SK-OV-3, SK-MEL-2, XF498 and HCT15 with ED_50 values ranging from 2.68 to 10.06㎍/㎖.
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金大根,趙徹衍 韓日經商學會 2001 韓日經商論集 Vol.21 No.-
This thesis studied if, under the varied audit environment, there is any significant difference on the degree of strictness (rigidity) of an auditor's quantitative materiality judgement when an auditor formulates audit opinion regarding to the exception out of gathered evidence. This study defined the degree of strictness as : the lower the average of threshold between unqualified and qualified opinion, the stronger the degree of strictness of an auditor's quantitative materiality judgment. This research found the followings: First, there is no statistically significant difference in the degree of strictness of an auditor's quantitative materiality judgment affected by the scale of the auditor. Second, the scale of the client affects an auditor in the degree of strictness of an auditor's quantitative materiality judgment. Third, there is a significant difference in the degree of strictness of an auditor's quantitative materiality judgment for listed vs. non-listed corporation. Fourth, the higher the debt ratio of the client, the stronger the degree of strictness of an auditor's quantitative materiality judgment. Fifth, an auditor applied quantitative materiality judgment more strictly for the client corporation with any turnover between net profit and net loss.
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