• 대한화장품학회:학술대회논문집
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• 대한화장품학회 2003년도 IFSCC Conference Proceeding Book I
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• pp.660-671
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• 2003

A chemical investigation of Peucedanum praeruptorum has resulted in the isolation of 3 khellactone derivatives, which have inhibitory effects on melanogenesis in B16 mouse melanoma cell lines. The khellactone derivatives were isolated from the crude extract of the roots of Pecedanum praeruptorum by a combination of adsorption chromatography and HPLC. The structures of isolated compounds were identified as 3', 4'-diangeloyl-cis-khellactone, 3'-angeloyl-4'-senecioyl-cis-khellactone and, 3', 4'-disenecioyl-cis-khellactone by $^1$H NMR, $^{13}$ C NMR and mass spectral studies and by comparisons of spectral data with reported literatures. These khellactone derivatives can be a good candidate for new skin whitening agent due to its strong inhibitory activity and safety.

• 한국결정학회지
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• 제5권1호
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• pp.14-19
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• 1994

트리풀르오로메칠트리페닐 1,2,4-트리오키소란(C21H15F3O3)은 삼사정계인 공간군 P1으로 a=10.477(1), b=11.056(1), c=9.917(3)A, a=104.7(1), B=122.7(1), r=63.9(1)°, Z=2, V=867.9(3) A3, Dc=1.43 g/cm3, λ(Mo BCn)=0.71069 A, μ=0.0116 cm-1, F(000)=384, 그리고 I ) 1.0 o(I) 인 1713 개의 관측 된 회절점에 대한 R 값은 0.067 였다. 직접법에 의하여 구조를 풀었으며 전행열-최소자숭법에 의하여 정밀화하였고 C-H결합길이는 0.96 A 에 고정하였다. 106.6°의 두 사이각을 갖는 페닐고리(2)와 고리(3)는 트리오키소란분자평면의 위쪽에 있으나 CF3기와 페닐고리(1)은 아래쪽으로 있다. 트리오키소란 꼬리는 봉투모양의 구조를 갖고 있으며 그의 두 탄소 원자(C(2)와 C(3))는 탄소원자의 내각에 거의 비슷한 각으로 치환기들과 연결되어 있다. 분자들은 van der Waals 힘에 의하여 결합되었고 가장 가까운 거리는 0(2) 와 F(2)(-x, 1+y,1-z) 사이의 3.256 A 이다.

• 한국자기학회지
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• 제3권3호
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• pp.201-207
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• 1993

$Pr_{15}Fe_{77}B_{8}$ 조성의 합금을 Ar분위기에서 유도용해로를 이용하여 주조하 였다. 이 합금을 석영관에 넣어 고주파 유도로를 이용하여 용해한 후 0.6 nm의 분출구를 통해 회전하는 Cu wheel위에 분사하여 비본형태로 제조하였다. 이 리본을 열간변형하여 결정방향성을 주었는데 이를 위 해 먼저 $680^{\circ}C$에서 $21.8\;kg/mm^{2}$의 압력으로 hot-press하여 92%의 densification을 갖는 시편을 얻을 수 있었다. 이 시편을 다양한 조건하에서 die-upset을 행하였다. 변형율이 높을 수록 $_{i}H_{c}$는 저하되었으나, $B_{r}$은 현저하게 증가되었으며, XRD 분석 결과(006)면에서의 회절강도가 증가되었다. 따라서 압축방향으로 자화용이축이 형성되었음을 알 수 있었다. Die-upset시의 변형속도가 빠를 수록 $_{i}H_{c}$는 증가되었으나, $B_{r}$은 감소되었다. 가공온도에 따른 $B_{r}$의 변화는 $750^{\circ}C$ 까지 상승한 후 감소되었다. 이 조성의 $4{\pi}M_{s}$는 11.8 kG였고 $750^{\circ}C$에서 0.05 mm/sec의 가공속도로 변형률 0.8로 die-upset한 경우에는 $B_{r}$이 11.0 kG로 우수한 자기이방성을 가지고 있으나, die-upset후에 $_{i}H_{c}$가 낮은 문제점이 있다.

• 한국농공학회지
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• 제30권3호
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• pp.51-57
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• 1988

The purpose of this paper is to know the effect of Adjustment factor (C) in Penman equation In the modified Penman equation by Doorenbos and Pruitt (1977), Potential Evapotranspiration(PET) was calculated in cases of (1) neglecting Adjustment factor (C=1, 0, A), (2) fixing Day/Night wind ratio (URATIO) to 2.0(B-l) and computing daily URATIO (B-2), and was compared with Actual Evapotranspiration (AET) for paddy fields in Suwon (1985-1986). The followings are a summary of this study results ; 1. Using 1985-1986 meteorological data, daily average PET in cases of A, B-i, B-2 were 4.61 mm/day, 4.81 mm/day and 5.36 mm/day respectively and daily average AET was 4.26 mm/day. The increment ratios of PET based on case A were 100%, 104.34% and 116.27% 2. The range of Adjustment factor (C) in cases of B-i, B-2 were 0.916-1.140 and 0.922-1.392 respectively. 3. The regression coefficient(r) between AET and PET in cases of A, B-i, B-2 were 0.928, 0.924 and 0.915 respectively.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제30권3호
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• pp.337-345
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• 2023

Different versions of the boundary Schwarz lemma for the 𝒩 (𝜌) class are discussed in this study. Also, for the function g(z) = z+b₂z²+b₃z³+... defined in the unit disc D such that g ∈ 𝒩 (𝜌), we estimate a modulus of the angular derivative of g(z) function at the boundary point 1 ∈ 𝜕D with g'(1) = 1 + 𝜎 (1 - 𝜌), where ${\rho}={\frac{1}{n}}{\sum\limits_{i=1}^{n}}g(c_i)={\frac{g^{\prime}(c_1)+g^{\prime}(c_2)+{\ldots}+g^{\prime}(c_n)}{n}}{\in}g^{\prime}(D)$ and 𝜌≠1, 𝜎 > 1 and c₁, c₂, ..., c_n ∈ 𝜕D. That is, we shall give an estimate below |g"(1)| according to the first nonzero Taylor coefficient of about two zeros, namely z = 0 and z ≠ 0. Estimating is made by using the arithmetic average of n different derivatives g'(c₁), g'(c₂), ..., g'(c_n).

• 동의신경정신과학회지
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• 제4권1호
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• pp.99-119
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• 1993

In order to compare and examine the effect the effect of Kuibitang, Kamiondarmtang and Kuibiondarmtang against stress, I induced immobilization stress by binding rats for 200mins under a little anesthetized with ether. I classified as normal group, control group which administrated 0.9% NaCl solution, sample A group which administrated Kuibitang, sample B group which administrated Kamiondarmtang and sample C group which administrated Kuibiondarmtang. I got some conclusions by measuring amounts of norepinephrine, epinephrine, triiodothyronine($T_3$) and thyroxine($T_4$) in 1, 3 and 5 days, respectively. 1. Norepinephrine showed high meaningful decrease after 1. 3 and 5 days in sample A group. It showed little decrease in sample B group. It showed a little meaningful decrease after 1 day and high meaningful decrease after 3 and 5 days in sample C group. 2. Epinephrine showed high meaningful decrease after 3 and 5 days in sample A group. It showed little decrease in sample B group. It showed a little meaningful decrease after 3 days and high meaningful decrese after 5 days in sample C group. 3. Triiodothyronine($T_3$) inclined to approach normal value in sample A, B, C group in comparision wit control group but didn't have high meaning. 4. Thyroxine($T_4$) inclined to approach normal va1ue in sample A, B, C group in comparision with contrl group but didn't have high meaning. As I consider the effect of experiments, I think that Kuibitang and Kuibiondarmtang have some effects against stress and it is right to apply to the treatment of stress.

• 한국결정학회지
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• 제10권2호
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• pp.105-109
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• 1999

Ar 기류 하에서 Re(N-C6H3-2,6-i-Pr2)2Cl3(py) (1)과 propionaldehyde (C2H5CHO)가 반응하여 생성된 혼합물에서, [cis-ReCl4(py)(N-C6H3-2,6-i-Pr2)·(NH2-C6H3-2,6-i-Pr2)] (2)가 분리되었다. 이 화합물의 구조가 X-ray 회절법으로 규명되었다. 착물 2의 결정학 자료: 단사정계 공간군 P21/n, a=11.555(1) Å, b=27.066(3) Å, c=11.881(1) Å, β=117.991(8)°, Z=4, R(wR2)=0.0332(0.0851.

• 대한화학회지
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• 제34권2호
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• pp.130-135
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• 1990

Z-3-파라-톨리치오-4-니트로-3-헥센의 결정은 단사정계에 속하며 a = 13.756 (3), b = 9.310(4), c = 21.305(3) $\AA$, $\beta = 95.0_{\circ}$이며 단위세포안에 8개의 분자가 있으며 2.0$\sigma$(I) 보다 큰 강도를 가진 2935개의 회절반점에 대하여 계단식 대각 최서자승법에 의하여 정밀화된 최종 R값은 0.085이다. 직접법에 의하여 구조를 풀었으며 C-H결합길이와 메칠기는 길이를 고정시켜 이상적인 기하학적구조에 맞도록 하여 계산을 정밀화하였다. 두 분자 A와 B는 끝의 두 에칠기를 제외하고는 거의 유사한 구조를 갖고 있다. 니트로기를 포함한 에틸렌 모양의 골격은 메칠벤젠기에 거의 수직으로 되어 있으며 두 에틸기는 시스-형 구조를 가지고 있으나 끝부분의 메칠기는 A분자에서는 그의 골격에 대해 서로 반대방향으로 향하고 있고 B분자는 같은 방향으로 향하고 있다. 결정내 분자들은 비결합성 van der Waals힘으로 쌓여져 있다.

• Bulletin of the Korean Chemical Society
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• 제15권1호
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• pp.37-45
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• 1994

$(NH_4)_{4.5}[H_{3.5}{\alpha}-PtMo_6O_{24}]{\cdot}1.5\;H_2O(A),\;(NH_4)_4[H_4{\beta}-PtMo_6O_{24}]{\cdot}1.5\;H_2O(B),\;and\;K_{3.5}[H_{4.5}{\alpha}-PtMo_6O_{24}]{\cdot}3\;H_2O(C)$ have been synthesized and their molecular structures have been also determined by single-crystal X-ray diffraction technique. The space groups, unit cell parameters, and R factors are as follows: Compound A, monoclinic, $A_{2/a}$, a= 19.074 (3), b=21.490 (3), c=15.183 (2) ${\AA};\;{\beta}$=109.67 (1) ${\AA}$; z=8; R=0.075($IF_0I>4{\sigma}(IF_0I);$ Compound B, triclinic, P$bar{1}$, a=10.776 (2), b=15.174 (4), c=10.697 (3) ${\AA};\;{\alpha}$ =126.29 (2), ${\beta}$=111.55 (2), ${\gamma}$=93.18 (2) ${\AA}$; Z=2; R=0.046($IF_0I>3{\sigma}(IF_0I);$): Compound C, triclinic, Pl, a=12.426 (2), b=13.884 (2), c=10.089 (1) ${\AA}$; ${\alpha}$=102.59 (2), ${\beta}$=110.73 (1), ${\gamma}$=53.93 (1) ${\AA}$; Z=2; R=0.074 ($IF_0I>3{\sigma}(IF_0I)$. Compounds A and C contain the well-known Anderson structure (planar structure) heteropoly oxometalate having approximate $bar{3}_m(D_{3d})$ symmetry, while compound B contains the bent structure heteropoly oxometalate having appproximate $2_{mm}(C2_v)$ symmetry. The bent structure and the planar one are geometrical isomers. These compounds are rot only novel heteroply molybdates containing platinate(IV) but also the first example of geometrical isomerism in the hexamolybdoheteropoly oxometalates. That isomerization surprisingly occurred because of the change of only 0.5 non-acidic hydrogen atom attached to the polyanion such as $[H_{3.5}{\alpha} -PtMo_6O_{24}]^{4.5-}{\to}[H_4{\beta}-PtMo_6O_{24}]^{4-}{\to}[H_{4.5}{\alpha} -PtMo_6O_{24}]^{3.5-}$. It seems that the gradual protonation of the polyanion plays an important role in that isomerism. These heteropolyanions form dimers by strong hydrogen bonds between two heteropolyanions in the respective crystal system.

• 한국응용곤충학회지
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• 제9권1호
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• pp.43-48
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• 1970

To investigate provincial seed Potato Production farms, a Preliminary survey on the local population of the aphids was made in Sulchon alphine area, Mooju-Goon, Chollapuk-Bo where the climatic conditions were almost same as those of Taegwanryong Kangwon-Do, where Alpine Experimental station is located. This area stands from 650 to 900 metres above the sea level and divided three location of A. B, C, by altitude. A stands at 900 metres above the sea level. B at 750 metres and C at 650 metres. A and B divided three points: Al, A2, A3, and Bl, B2, B3- and divided four points-Cl, C2, C3, C4- at the distance of 300 metres apart each other. The traps were operated from July 21 to October 31, 1969. Otherwise, the traps established at Suwon (inland) and Taegwanryong where Alpine Experimental Station. A total of some 70 species including five virus vector species were identified. The Numbers of species at 10 locations, Suwon and Taegwanryong are as follows; Al-34, A2-38, A3-29, B1-25, B2-26, B3-29, C1-27, C2-14, C3-32, C4-37, species (Table 1), Suwon-49 species (including 5 virus vectors species), Taegwanryong-22 species (including 4 virus vector species). The aphids are shown in Table 1 and the Vectors are as follows: 1. Aphis gossypii Glover 2. Aulacorthum solani (Kaltenbach) 3. Lipaphis erysimi (Kaltenbach) 4. Myzus persicae(Sulzer) 5. Phorodon humuli (Schrank) Numbers of vectors versus total aphid at each locations, including inland (Suwon) and alpine area (Taegwanryong) where Alpine Experimental Station are as Fig. 1. Of a total 8,902 aphids, 6,400 $(80\%)$ were Tetraneura sp. The number of aphids devoid of the number of Tetraneura sp. are as follows; (Numbers means mean of each locations) A; 215. B; 115, C; 176 and Suwon; 2,952, Taegwanryong; 247. Densities of aphids at the locations is lower :han those at Suwon and Taegwanryong. And density of vectors at the locations, at ranged from 11 to 37, is love. than those at inland (Suwon; 197) and alpine area (Taegwanryong; 90). Thus, this area is suitable for seed potato production as Multiplication field.