• 한국해양공학회지
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• 제24권1호
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• pp.34-38
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• 2010

An analytical solution procedure for the dynamic response of beams with variable properties is developed by using an asymptotic solution and the Green's function. This asymptotic closed form solution is derived for the transverse vibration of beams under the assumption of slowly varying properties, such as mass, cross-section, tension etc., along the beam length. However, this solution is still found to be very accurate even in the case of large variation, such as step change in cross-section, mass, and tension. Therefore, this derived asymptotic closed form solution and the Green's function can be easily applied to find dynamic responses for various kind of beam vibration problems.

• 한국물환경학회지
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• 제23권2호
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• pp.216-221
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• 2007

The adsorption characteristics of malachite green on waste garnet have been investigated for its treatment from aqueous solution by employing waste garnet which is generated from the abrasive production process as an adsorbent. The influential factors examined were the initial concentration of malachite green in solution, reaction temperature, and the amount of adsorbent. Also, the effect of the modification of the surface of adsorbent on adsorption was examined. As the initial malachite green was increased with reaction temperature and the color removal of malachite green-containing solution was promoted with the amount of adsorbent. Finaly, increased adsorption of malachite green could be attained when the surface of glass was modified by hexamethyldisilazane.

• Journal of Ship and Ocean Technology
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• 제6권1호
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• pp.34-53
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• 2002

Numerical solution of the forward-speed radiation problem for a half-immersed cylinder advancing in regular waves is presented by making use of the improved Green integral equation in the frequency domain. The B-spline higher order panel method is employed stance the potential and its derivative are unknown at the same time. The present numerical solution of the improved Green integral equation by the B-spline higher order Kelvin panel method is shown to be free of irregular frequencies which are present in the Green integral equation using the forward-speed Kelvin-type Green function.

• 동아시아식생활학회지
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• 제6권2호
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• pp.127-134
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• 1996

녹차 음용이 알루미늄을 투여한 흰쥐의 혈청 효소 활성도에 미치는 영향을 알아보고자 흰쥐 Sprague-Dawley계 수컷 25마리를 .5개 그룹 즉 대조군, 녹차음용군, 녹차와 알루미늄 용액 혼합군, 먼저 녹차를 2주 동안 투여 한 후에 알루미늄 용액만 2주 동안 투여한 군, 알루미늄 용액만 투여한 군으로 나누어 4주 동안 사육하여 aspartate amino transferase(AST), alanine amino transferase (ALT), lactate dehydrogenase (LDH) cholinesterase(ChE)를 조사하였다. 체중변화는 대조군에 비하여 전 실험군이 감소하였는데 특히 알루미늄과 녹차를 같이 투여한 군의 체중이 감소되었다. ALT는 대조군에 비하여 별다른 차이점을 보이지 않았으나 녹차와 같이 투여한 군에 비하여 알루미늄 용액만 투여한 군이 높았고 AST는 대조군에 비하여 녹차 투여군만 감소하였고 녹차와 알루미늄을 같이 투여한 군은 증가하였으나 알루미늄 용액만 투여한 군에 비하여 낮았다. LDH는 대조군에 비하여 전 실험군이 증가하였으며 특히 알루미늄 용액만 투여한 군은 녹차를 투여한 군에 비하여 유의적으로 증가하였고 ChE는 대조군에 비하여 알루미늄 용액만 투여한 군은 유의적으로 감소하였으나 알루미늄 용액만 투여한 군에 비하여 녹차를 같이 투여한 군은 증가하였다.

• 한국세라믹학회지
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• 제47권6호
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• pp.613-617
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• 2010

Ferro-Nickel slag is one of the by-products in Ferro-Nickel manufacturing process. The slag is composed of $SiO_2$, MgO, $Fe_2O_3$ and others. But the slag has been buried at landfill despite having valuable elements. This study tried to extract Mg ion and fabricate Mg compound from ferro-nickel slag using hydrochloric acid solution. Mg ion was extracted with Si, Fe and other ions in HCl solution. So reprocess was needed for gaining high purity Mg ion. It was thought that Si ion or $SiO_2$ precipitated in HCl solution and removed from solution in filtering process. Fe ion converted into $Fe(OH)_3$ after reacted with $NH_4OH$ and precipitated in HCl solution. After these process, the filtrate was composed of high purity Mg ion. $MgCl_2{\cdot}NH_4Cl{\cdot}6H_2O$ was obtained through drying of filtrate and this product was changed into MgO by burning process ($600^{\circ}C$-30 min). That is, 1st material or solution for manufacturing 2nd product was fabricated using acid dissolution method and other treatments.

• 대한화장품학회지
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• 제32권2호
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• pp.89-91
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• 2006

본 연구에서는 치자그린의 광에 의한 변색을 방지하는 시료를 찾고, 그 변색방지능을 기존 변색방지제와 비교하고자 했다. 치자그린 0.10 wt% 수용액을 polyoxyethylene (POE) (12) dimethicone으로 처리하여 자외선 조사하였을 때 기존 변색방지제인 methoxycinnamidopropyl hydroxysultaine으로 처리하였을 때보다 변색이 방지되는 정도가 높았다. 실험결과 POE (12) dimethicone의 변색방지능은 시료의 농도에 영향을 받는 결과를 나타내었으며 치자그린 0.10 wt% 수용액에 POE (12) dimethicone 을 1.0%로 처리하였을 때 변색방지가 되는 정도가 가장 높았다. 치자그린을 POE (12) dimethicone으로 처리한 수용액은 자외선 조사 후 흡광도 유지율이 처리 전 78%에서 95%로 높아졌으며, 실외 태양광 노출에서도 안정성이 높아지는 것으로 나타났다. 치자그린의 색소가 안정화되는 기작은 명확하게 밝혀지지는 않았으나, POE (12) dimethicone의 dimethicone기가 중요한 기능을 하는 것으로 추정된다.

• 한국전기전자재료학회논문지
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• 제31권7호
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• pp.486-489
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• 2018

Solution-processed organic light-emitting diodes (OLEDs) have the advantages of low cost, fast fabrication, and large-area devices. However, most studies on solution-processed OLEDs have mainly focused on solution-processable hole transporting materials or emissive materials. Here, we report fully solution-processed green OLEDs including hole/electron transport layers and emissive layers. The electrical and optical properties of OLEDs based on solution-processed TPBi (2,2',2"-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole)) as the electron transport layer were investigated with respect to the spin speed and the number of layers. The performance of OLEDs with solution-processed TPBi exhibits a power efficiency of 9.4 lm/W. We believe that the solution-processed electron transport layers can contribute to the development of efficient fully solution-processed multilayered OLEDs.

• Journal of Ship and Ocean Technology
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• 제3권4호
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• pp.1-14
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• 1999

The improved Green integral equation using the Kelvin-type Green function in known free of irregular frequencies where the integral over the inner free surface integral is removed from the integral equation, resulting in an overdetermined integral equation. The solution of the overdetermined Green integral equation is shown identical with the solution of the improved Green integral equation Using the B-spline higher order panel method, the overdetermined equation is discretized in two different ways; one of the resulting linear system is square and the other is redundant. Numerical experiments show that the solutions of both are identical. Using the present methods, the exact values and higher derivatives of the potential at any place over the wetted surface of the body can be found with much fewer panels than low order panel method.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2000년도 추계학술대회 논문집
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• pp.184-188
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• 2000

The improved Green integral equation of overdetermined type applied to the radiation problem for an oscillating cylinder in the presence of weak current is presented. A two-dimensional Green function for the weak current is also presented. The present numerical solution of the Improved Green integral equation by the B-spline higher order Kelvin panel method is shown to be free of irregular frequencies which are present in the usual Green integral equation.

• 한국응용곤충학회:학술대회논문집
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• 한국응용곤충학회 2003년도 추계 학술발표회
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• pp.167-167
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• 2003