• 농약과학회지
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• 제10권1호
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• pp.7-14
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• 2006

새로운 5-benzofuryl-2-[1-(alkoxyimino)alkyl]-3-hydroxycyclohex-2-en-1-one 유도체들의 3차원적인 정량적 구조와 발아 전, 벼(Oryza sativa L.)와 논피(Echinochloa crus-galli)에 대한 제초활성과의 관계를 비교분자 유사성 지수분석(CoMSIA) 방법으로 연구하였다. 가장 양호한 CoMSIA 모델로서 벼에 대한 A5 모델($r^2_{cv.}=0.569$ 및 $r^2_{ncv.}=0.941$)은 주로 소수성장(39.7%)과 입체장(31.6%) 그리고 논피에 대한 B4 모델($r^2_{cv.}=0.595$ 및 $r^2_{ncv.}=0.933$)은 정전기장(46.7%)과 수소결합 받게장(30.8%)에 각각 의존적이었다. B4 모델에 의하여 예측된 $R_1=SF_5,\;R_2=R_3=R_4=H(P1)$ 치환체(벼: $pI_{50}=4.84$ 및 논피: $pI_{50}=7.21$, ${\Delta}pI_{50}=2.37$)는 논피에 대하여 가장 높은 제초활성을 나타내었으며 두 초종 간 선택성이 가장 큰 치환체이었다.

• The Korean Journal of Pain
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• 제12권1호
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• pp.8-15
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• 1999

Following peripheral nerve injury, rats will show a tactile allodynia and hyperalgesia. But the mechanism of allodynia is still obscure. The present studies, using rats rendered allodynia by loosely constrictive ligation of the common sciatic nerve (Bennett Model) and tight ligation of L5 & L6 spinal nerve (Chung Model), aimed to investigate the changes of metabotrophic glutamate receptor type 5 on the development of tactile allodynia. Male Sprague-Dawley rats (130~200 g) were anesthetized with halothane, the rats were randomly divided into one of these three groups, Group 1 (Sham operation), Group 2 (Bennett model) and Group 3 (Chung model). Seven days after surgical procedure, the animal was reanesthetized and decapitated. The spinal cord was quickly removed and stored at deep freezer for polymerase chain reaction (RT-PCR). In Group 2&3, rats showed that tactile allodynia checked by up-down method with calibrated 8 von Frey hair. The level of gene expression of mGluR5 mRNA was significantly increased in group 2 and 3. These increases was significantly different from sham operation, group 1. It was also showed that the increasing patterns of group 2 and 3 in the gene expression were similar correlation with the results of the threshold for tactile allodynia on von Frey hair test. Even though there were some differences between Bennett model and Chung model, these results suggested that mGluR5 had partly attributed to making a tactile allodynia from these models.

• 한국물환경학회지
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• 제25권6호
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• pp.984-993
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• 2009

There have been growing concerns of algal growth at Daecheong reservoir due to eutrophication with excess nutrient inflow. Rainfall-driven runoff and pollutant from watershed are responsible for eutrophication of the Daecheong reservoir. In this study, two subwatersheds of the Daecheong reservoir were selected and water quality characteristics were analyzed. The L-THIA ArcView GIS model was used for evaluation of direct runoff and water quality. The $R^2$ and the EI value for direct runoff were 0.95 and 0.93 at Wol-oe watershed and were 0.81, 0.71 at An-nae watershed, respectively. The $R^2$ for SS, T-P were 0.53, 0.95 at Wol-oe watershed and 0.89, 0.89 at An-nae watershed, respectively. It has been proven that the L-THIA ArcView GIS model could be used for evaluating direct runoff and pollutant load from the watershed with reasonable accuracies.

• 전력전자학회논문지
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• 제5권5호
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• pp.435-442
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• 2000

리튬폴리머전지의 전기적인 특성을 평가하고 이것을 시스템 측면에서 고찰할 수 있는 이론적인 토대를 마련하기 위하여 본 논문에서는 전지의 전기적인 특성평가를 위한 전기적모델링 기법에 관하여 고찰하였다. 실제 제작된 리튬폴리머전지의 특성자료를 바탕으로 R-L-C 모델을 이용한 동적해석방식과 PSpice 모델을 이용한 정적해석방식을 통하여 리튬폴리머전지의 전기적 특성을 해석하였다. 각 모델의 풍/방전시의 전기적 특성을 고찰하고 충/방전조건에 따른 전지의 단자전압등 특성변수의 변화를 실제 제작된 리튬폴리머전지와 비친, 검토하여 그 타당성을 검증하였다.

• Fisheries and Aquatic Sciences
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• 제5권3호
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• pp.200-205
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• 2002

Temperature-dependent pharmacokinetics of ciprofloxacin (CIP) was studied in the cultured olive flounders, Paralichthys olivaceus, and black rockfish, Sebastes schlegeli using high performance liquid chromatography (HPLC) originally developed for quinolone determination from livestock. Pharmacokinetics of CIP was apparently affected by ambient water temperature. In a two-compartment model for flounders after oral dosage of 20 mg/kg, $K_{01},\;at\;13^{\circ}C$ and $23^{\circ}C$ were 4.18 and 1.20/hr, respectively. The $K_{10},\;T_{max}\;and\;C_{max}\;at\;13^{\circ}C$ were 5.574/hr, l4.37${\mu}g/mL\;and\;3.15{\mu}g/mL,$ respectively. The corresponding values at $23^{\circ}C$ were l2.84/hr, 15.39${\mu}g/mL\;and\;6.38{\mu}g/mL$, respectively. The AUC, $T_{1/2} (\alpha)\;and\;T_{1/2}\;(\beta)$ were 278.23 ${\mu}g \cdot hr/mL$, 0.24hr and 47.02hr at $13^{\circ}C$ and 3l7.8l${\mu}g \cdot hr/mL$, 0.30 hrs and 60.78hrs at $23^{\circ}C$ for the flounder, respectively. Similar CIP pharmacokinetics were revealed in the black rockfish after oral dosage of 20 mg/kg under the two water temperature regimes. These pharmacokinetical results have some implication in the optimal usage of recently introduced antibacterials in the farmed fish, which were primarily adapted for poultry and mammalian species.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제54권7호
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• pp.339-342
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• 2005

We present a new high-frequency equivalent circuit model for 52pin QFP used in typical IC's and extract R, L, and C values of this circuit model using a 3-D E & M field simulator. Futhermore, L and C value variations as a function of Pin number due to the shape differences of the leads have been fitted to 2nd order polynomials in order to extend the applicability of this model.

• 대한수학회논문집
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• 제12권2호
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• pp.305-309
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• 1997

In this paper we prove the existence of a special type of multivortex solutions of $SU (N)_g \times U(1)_l$ Chern-Simons model. More specifically we prove existence of solutions of the self-duality equations for $(\Phi(x), j =1, \cdots, N$ has the same zeroes. In this case we find that the equation can be reduced to the single semilinear elliptic partial differential equations studied by Caffarelli and Yang.

• 생물환경조절학회지
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• 제31권4호
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• pp.325-331
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• 2022

토마토의 생육과 수확량을 예측하기 위한 중요한 요소 중의 하나는 엽면적이다. 이러한 엽면적을 정확하게 예측하는 것은 토마토 식물 생장 평가 모델의 시작이라고 할 수 있다. 이를 위해 본 연구는 토마토 잎의 측정을 통해 엽면적(LA)을 추정하는 효과적인 모델을 확인하기 위해 수행하였다. 토마토 식물 잎 조사를 위해 2주 간격으로 5개체의 토마토 식물체의 전개된 모든 잎에 대해 엽면적(LA), 엽장(L), 엽폭(W), 엽신장(La)를 측정하였다. LA와 토마토 잎 독립변수의 상관관계는 La × W, L × W, La + W, L + W의 식이 강한 양의 관계를 나타냈다. LA 추정은 LA = a + b(La² + W²)을 사용하는 선형 모델이 가장 정확한 추정치를 나타내었다(R² = 0.867, RMSE = 88.76). 9월부터 12월까지 토마토 잎의 위치에 따른 상, 중, 하 엽의 모델을 살펴본 결과, 상, 중, 하로 잎 위치에 따른 모델별 결정계수(R²) 값은 각각 0.878, 0.726, 0.794였다. 상위엽을 바탕으로 추정된 모델의 정확도가 가장 높았는데, 이는 10월 이후 토마토 재배 농가에서 중위엽과 하위엽에 실시한 반적엽의 영향으로 판단된다.

• 자원ㆍ환경경제연구
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• 제20권3호
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• pp.459-487
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• 2011

포스트 교토체제에서는 A/R CDM 등 산림 분야의 중요성이 증대할 것으로 전망된다. A/R CDM에 대한 정확한 경제성 평가는 투자의사결정에 유용한 정보를 제공하여 투자 활성화로 이어질 수 있다. 본 연구에서는 전통적 경제성 평가 방법이 간과한 의사결정자의 의사결정권의 가치 내지 기다림의 가치를 반영한 실물옵션 방법에 의해 모형을 구축하고 실제 A/R CDM 사례를 적용하여 실증분석을 하였다. 그 결과 적용 사례의 경우 최적투자분기점이 추정된 l-CER의 가격보다 낮게 나타남으로써 적절한 투자의사결정이 이루어졌음을 알 수 있었다. 그러나 할인율의 수준과 적용 범위에 따라 최적투자분기점과 투자의사결정이 크게 영향을 받는 것으로 나타났다.

• 대한기계학회논문집B
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• 제31권2호
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• pp.141-150
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• 2007

This paper presents a lumped model to predict crosstalk characteristics of thermally driven inkjet print heads. Using the lumped R-C model, heating characteristics of the head are predicted to be in agreement with IR temperature measurements. The inter-channel crosstalk is simulated using the lumped R-L network. The values of viscous flow resistance, R and flow inertance, L of connecting channels are adjusted to accord with the 3-D numerical simulation results of three adjacent jets. The crosstalk behaviors of a back shooter head as well as a top shooter head have been investigated. Predictions of the proposed lumped model on the meniscus oscillations are consistent with numerical simulation results. Comparison of the lumped model with experimental results identifies that abnormal two-drop ejection phenomena are related to the increased meniscus oscillations because of the more severe crosstalk effects at higher printing speeds. The degree of crosstalk has been quantified using cross-correlations between neighboring channels and a critical channel dimension for acceptable crosstalk has been proposed and validated with the numerical simulations. Our model can be used as a design tool for a better design of thermal inkjet print heads to minimize crosstalk effects.