• 제목/요약/키워드: bank

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Numerical Analysis for Hydrodynamic Interaction Effects between Vessel and Semi-Circle Bank Wall

  • 이춘기;문성배;오진석;정연철;정태권
    • 한국항해항만학회:학술대회논문집
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    • 한국항해항만학회 2013년도 춘계학술대회
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    • pp.29-30
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    • 2013
  • The hydrodynamic interaction forces and moments induced by the vicinity of bank on a passing vessel are known as bank effects. In this research, the characteristic features of interaction acting on a passing vessel in the proximity of a semi-circle bank wall are described and illustrated, and the effects of ship velocity, water depth and the lateral distance between ship and semi-circle bank wall are summarized and discussed.

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필터뱅크와 적응필터를 이용한 전력품질 외란 검출기법 (Power Quality Disturbances Detection Technique using Filter Bank and Adaptive Filters)

  • 윤재준;이정규;손상욱;배현덕
    • 전기학회논문지
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    • 제61권1호
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    • pp.162-167
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    • 2012
  • In power quality monitoring, it is very important to detect disturbances (sag, swell, transient, and interruption) accurately. In this paper, a detection method for power quality disturbances by combining the filter bank system and adaptive filter is proposed. To decompose power signal, binary tree structured filter bank system is designed. In the filter bank system, the fundamental filter bank(QMF bank) is used as a module in each decomposing level. An adaptive filter is used to improve the detection accuracy of disturbances for each subband signal. In the adaptive filter, the measure of estimated error change is used to detect singular points of power quality disturbances. Computer simulations were performed on synthetic signals which have disturbances to assess the performance of the proposed method.

The Effect of Bad Credit and Liquidity on Bank Performance in Indonesia

  • SUYANTO, Suyanto
    • The Journal of Asian Finance, Economics and Business
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    • 제8권3호
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    • pp.451-458
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    • 2021
  • The objective of this research is to analyze the effect of bad credit and liquidity on bank performance with the mediation of capital adequacy. Data were provided by banking institutions listed on the Indonesia Stock Exchange from the period of 2011-2019. The analysis technique was PLS-SEM supported by an application named WarpPLS 6.0. The results of the research show that the effect of bad credit and liquidity on bank performance is not significant. A high level of bad credit is associated with a low level of bank performance. Bank earnings decline along with low profitability. This relationship is not significant because banks can still cover some proportions of bad credit through capital availability. Capital adequacy as an intervening variable has mediated partially the effect of bad credit and liquidity on bank performance. Besides, capital adequacy has a strong effect on credit distribution. Agency theory says that the owner of the fund (the savers of saving account, current account, deposit account) is called principal while the bank as the trusted institution to manage the fund is called an agent. If customers fulfill their duty, then bad credit never happens.

Potential of River Bottom and Bank Erosion for River Restoration after Dam Slit in the Mountain Stream

  • Kang, Ji-Hyun;So, Kazama
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2011년도 학술발표회
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    • pp.46-46
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    • 2011
  • Severe sediment erosion during floods occur disaster and economic losses, but general sediment erosion is basic mechanism to move sediment from upstream to downstream river. In addition, it is important process to change river form. Check dam, which is constructed in mountain stream, play a vital role such as control of sudden debris flow, but it has negative aspects to river ecosystem. Now a day, check dam of open type is an alternative plan to recover river biological diversity and ecosystem through sediment transport while maintaining the function of disaster control. The purpose of this paper is to verify sediment erosion progress of river bottom and bank as first step for river restoration after dam slit by cross-sectional shear stress and critical shear stress. Study area is upstream reach of slit check dam in mountain stream, named Wasada, in Japan. The check dam was slit with two passages in August, 2010. The transects were surveyed for four upstream cross-sections, 7.4 m, 34 m, 86 m, and 150 m distance from dam in October 2010. Sediment size was surveyed at river bottom and bank. Sediment of cobble size was found at the wetted bottom, and small size particles of sand to medium gravel composed river bank. Discharge was $2.5\;m^3/s$ and bottom slope was 0.027 m/m. Excess shear stress (${\tau}_{ex}$) was calculated for hydraulic erosion by subtracting the values of critical shear stress (${\tau}_{c}$) from the value of shear stress (${\tau}$) at river bottom and bank (${\tau}_{ex}=\tau-{\tau}_c$). Shear stress of river bottom (${\tau}_{bottom}$) was calculated using the cross-sectional shear stress, and bank shear stress (${\tau}_{bank}$) was calculated from the method of Flintham and Carling (1988). $${\tau}_{bank}={\tau}^*SF_{bank}((B+P_{bed})/(2^*P_{bank}))$$ where $SF_{bank}=1.77(P_{bed}/p_{bank}+1.5)^{-1.4}$, B is the water surface width, $P_{bed}$ and $P_{bank}$ are wetted parameter of the bed and bank. Estimated values for ${\tau}_{bottom}$ for a flow of $2.5\;m^3/s$ were lower as 25.0 (7.5 m cross-section), 25.7 (34 m), 21.3 (86 m) and 19.8 (150 m), in N/$m^2$, than critical shear stress (${\tau}_c=62.1\;N/m^2$) with cobble of 64 mm. The values were insufficient to erode cobble sediment. In contrast, even if the values of ${\tau}_{bank}$ were lower than the values for ${\tau}_{bottom}$ as 18.7 (7.5 m), 19.3 (34 m), 16.1 (86 m) and 14.7 (150 m), in N/$m^2$, excess shear stresses were calculated at the three cross-sections of 7.5 m, 34 m, and 86 m distances compare with ${\tau}_c$ is 15.5 N/$m^2$ of 16mm gravel. Bank shear stresses were sufficient for erosion of the medium gravel to sand. Therefore there is potential to erode lateral bank than downward erosion in a flow of $2.5\;m^3/s$. Undercutting of the wetted bank can causes bank scour or collapse, therefore this channel has potential to become wider at the same time. This research is about a potential of sediment erosion, and the result could not verify with real data. Therefore it need next step for verification. In addition an erosion mechanism for river restoration is not simple because discharge distribution is variable by snow-melting or rainy season, and a function for disaster control will recover by big precipitation event. Therefore it needs to consider the relationship between continuous discharge change and sediment erosion.

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중소기업 대출이 은행 자기자본비율과 경영성과에 미치는 영향 (The impacts of Small and Medium-sized Bank Loan on Bank's Equity Ratio and Performance in Korean Banking Industry)

  • 이상욱
    • 한국산학기술학회논문지
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    • 제18권2호
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    • pp.625-630
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    • 2017
  • 본 연구는 우리나라 은행의 중소기업대출과 자기자본비율 및 경영성과의 관계를 분석하였다. 또한 은행 중소기업대출과 자기자본비율 및 경영성과의 관계가 금융위기를 전후하여 유의적인 차이가 존재하는지를 분석하였다. 연구 결과에 따르면 우리나라의 은행 중소기업대출은 은행 자기자본비율과 경영성과에 유의적 영향을 주는 것으로 나타났다. 자기자본비율의 분석에서는 모든 분석 결과에서 유의한 결과를 보인 반면, 경영성과 분석에서는 일부 경영성과 지표에서 유의한 결과를 보였다. 또한 은행 중소기업대출과 자기자본비율 및 경영성과의 관계는 금융위기 전후에 걸쳐 유의한 차이를 보이는 것으로 나타났다. 자기자본비율 분석에서는 모든 분석결과에서 유의한 결과를 보인 반면, 경영성과 분석에서는 일부 지표에서 유의한 결과를 보였다. 금융위기 이후 은행 중소기업 대출이 은행 자기자본비율 및 경영성과 개선에 유의한 영향을 미치는 것으로 나타났다. 금융위기 이전에는 중소기업 대출이 기본 자기자본비율에 부정적 영향을 미치는 반면, 중소기업 대출이 BIS자기자본비율 및 경영성과에 미치는 유의한 영향은 발견되지 않았다. 그러나 금융위기 이후에는 중소기업 대출이 기본 자기자본비율 뿐 아니라 BIS 자기자본비율 및 경영성과의 개선에 유의한 영향을 미치는 것으로 나타났다. 금융위기를 전후하여 우리나라 은행의 중소기업 대출이 은행 자기자본비율 및 경영성과 개선에 미치는 영향에 유의적 변화가 있는 것으로 진단된다. 본 연구는 은행의 기업의 자금중개기능 측면 및 은행 대출자산 구성 측면에서 중요성을 가지는 은행 중소기업대출을 중심으로 은행 자기자본비율과 경영성과의 관계를 미시적 관점에서 분석하였다는 점에서 의의가 있다. 본 연구는 은행의 중소기업대출 행태 결정요인, 중소기업대출 기법 중심이 주류를 이루고 있는 기존 은행 중소기업대출 연구에 새로운 결과를 제시할 것으로 기대된다. 금융위기를 전후하여 우리나라 은행의 중소기업 대출이 은행 자기자본비율 및 경영성과 개선에 미치는 영향이 변화가 있다는 본 연구결과는 은행의 중소기업 대출관계 변화 및 중소기업 금융 활성화 등에 유의미한 시사점을 줄 것으로 기대된다.

지자기자료 및 정밀해저지형자료를 이용한 마리아나 해구 해저 열수광상 연구 (A Study on the Hydrothermal Vent in the Mariana Trench using Magnetic and Bathymetry Data)

  • 김창환;김호;정의영;박찬홍;고영탁;이승훈
    • 한국해양학회지:바다
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    • 제14권1호
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    • pp.22-40
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    • 2009
  • Mariana 해령 후열도 분지내에 위치하고 있는 NW Rota-1과 Esmerala Bank의 지형 및 자력특성을 연구하고 열수분출대의 위치를 추정하기 위하여 2007년 9월에 한국해양연구원 온누리호를 이용하여 획득한 정밀해저지형자료 및 해상자력탐사자료를 함께 분석하였다. NW Rota-1 해산의 전체적인 모양은 원뿔 형태이며, 정상부의 수심은 약 500 m이다. NW Rota-1 해산에서는 급경사나 큰 계곡과 같은 지형적 특성은 보이지 않지만 남동쪽 방향에 불규칙한 지형이 발달해 있다. Esmeralda Bank의 전체적인 모양은 서쪽 방향이 열린 칼데라의 형태를 띠고 있다. Esmeralda Bank의 정상부 수심은 약 50 m로 매우 얕다. Esmeralda Bank의 서쪽부분은 동쪽부분보다 경사가 더 급하고 지형의 기복이 심하게 나타나며, Bank 생성 후 무너져 내렸거나 침식에 의해 형성된 것으로 보이는 계곡이 관찰된다. NW Rota-1 해산과 Esmeralda Bank의 자기이상분포는 두 지역 모두 북쪽에 저이상이 나타나고 남쪽에 고이상이 분포하며 정상부에서는 급격한 자기변화를 보이고 수심이 깊은 기저부에서는 완만한 자기변화가 나타난다. NW Rota-1 해산 정상부에서 저자화강도이상대가 나타나며 이 저이상대를 둘러싸고 남쪽과 북쪽으로 주변보다 높은 자화강도 이상이 관측되는데 이는 이 해저산의 화구륜과 관계가 있는 것으로 생각된다. Esmeralda Bank는 정상부와 서쪽에 저자화강도이상대가 분포하고 있다. NW Rota-1와 Esmeralda Bank 정상부의 저자화강도이상대에서 열수분출대가 존재할 가능성이 있다.

Ginseng saponins and the treatment of osteoporosis: mini literature review

  • Siddiqi, Muhammad Hanif;Siddiqi, Muhammad Zubair;Ahn, Sungeun;Kang, Sera;Kim, Yeon-Ju;Sathishkumar, Natarajan;Yang, Dong-Uk;Yang, Deok-Chun
    • Journal of Ginseng Research
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    • 제37권3호
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    • pp.261-268
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    • 2013
  • The ginseng plant (Panax ginseng Meyer) has a large number of active ingredients including steroidal saponins with a dammarane skeleton as well as protopanaxadiol and protopanaxatriol, commonly known as ginsenosides, which have antioxidant, anticancer, antidiabetic, anti-adipocyte, and sexual enhancing effects. Though several discoveries have demonstrated that ginseng saponins (ginsenosides) as the most important therapeutic agent for the treatment of osteoporosis, yet the molecular mechanism of its active metabolites is unknown. In this review, we summarize the evidence supporting the therapeutic properties of ginsenosides both in vivo and in vitro, with an emphasis on the different molecular agents comprising receptor activator of nuclear factor kappa-B ligand, receptor activator of nuclear factor kappa-B, and matrix metallopeptidase-9, as well as the bone morphogenetic protein-2 and Smad signaling pathways.