• 대한화학회지
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• 제34권6호
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• pp.509-516
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• 1990

n-알코올 용매에서 아세트아미드(AA)의 아미노 양성자의 nmr 화학적 이동과 선모양을 온도의 함수로 조사 연구하였다. 아미노 양성자의 화학적 이동 변화를 용매의 극성 파라미터 중에서 Reichardt의 $E_{T}$(30)으로 고찰하여 그들 사이에 다음과 같은 관계가 존재함을 밝혔다. ${\delta}_{obs}$ = ${\delta}_{o}$ ＋ aE$_{T} (30) ＋ b[E_{T}(30)]^2$ 여기서 ${\delta}_{o}$는 용질의 기체 상태 또는 $E_{T}$(30)가 0인 상태에서의 용질의 화학적 이동이며, a는 알코올 용액에서 용질이 갖는 고유한 특성이며, b는 용질-용매의 상호작용을 나타내는 상수이다. 또한, 선모양의 분석에서 얻은 N-C(O) 결합 주위로의 부자유회전 장애도 아미노 양성자에 대한 화학적 이동의 행동과 유사하게 용매의 $E_{T}$(30)과 밀접한 관계가 있음을 알아 내었다.

• 대한화학회지
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• 제33권2호
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• pp.149-155
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• 1989

n-알코올 용매에서 티오아세테이트아미드(TA)의 아미노 양성자의 nmr 화학적 이동과 선모양이 온도를 변화시켜가면서 구하였다. 아미노 양성자의 화학적 이동변화를 용매의 극성 파라미터 중에서 Reichardt의 $E_T(30)$과 연관지어 고찰하였으며, 그들 사이에는 다음의 관계가 있음이 밝혀졌다. ${\delta}_{obs}=a{\cdot}E_T(30)＋b{\cdot}(E_T(30))_2$ 여기서 a는 알코올 용액에서의 용질의 고유한 특성이며, b는 용질-용매 분자간 상호작용의 특성을 나태내고 있다. 또한 선모양 분석에서 얻은 N-C(S) 결합 주위로의 부자유 회전 장애도 아미노 양성자의 화학적 이동의 행동과 유사하게 $E_T(30)$과 밀접한 관계가 있음을 알았다.

• 한국의류학회지
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• 제47권2호
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• pp.311-322
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• 2023

In this study, the properties of various material combinations were evaluated and an ideal material for fabricating protection pads for women's army combat uniforms was determined. Eight specimens were used for the evaluation: two types of materials, namely thermoplastic polyurethane for 3D printing, T and ethylene-vinyl acetate, E; two infill densities, namely 10%, 10 and 30%, 30; two types of pad designs, i.e., without holes, A and with holes, B; 2×2×2=8 and control E. The tensile strength, flexural strength, impact absorption, and weight of these specimens were evaluated. Results revealed that E was the most flexible material; however, its tensile strength and impact absorption were very low. Protection pads made from T (T-10A, T-10B, T-30A, and T-30B) had excellent tensile strength and impact absorption; however, they had low performance in ease of movement. Alternatively, protection pad with holes and an infill density of 30% produced using a combination of T and E had a high initial tensile modulus and exhibited excellent impact absorption. Moreover, it was flexible and light, which satisfies the standards and conditions required by protection pads. However, if T-E-10A and T-E-30B exhibited low impact absorption, as required, they can be regarded as appropriate materials for protection pads.

• Asian-Australasian Journal of Animal Sciences
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• 제19권1호
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• pp.19-25
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• 2006

The effect of vitamin E supplementation on plasma ${\alpha}$-tocopherol level, total antioxidant level and reproductive performance in Murrah buffaloes was studied during periparturient period. Twenty-four advance pregnant buffaloes were randomly divided into four equal groups as $T_1$, $T_2$, $T_3$ and $T_4$ and were supplemented with 0, 1,000, 1,500 and 2,000 IU of ${\alpha}$-tocopheryl acetate (Merck) from 60 days prepartum to 30 days postpartum and 0, 500, 750 and 1,000 IU from 30 to 60 days postpartum, respectively. Blood samples were collected at -60, -45, -30, -15, -7, 0, 7, 15, 30 and 60 days of parturition and were analyzed for plasma ${\alpha}$-tocopherol and total antioxidant activity (TAA). The intake of DM, CP and TDN did not vary among different groups. Plasma ${\alpha}$-tocopherol and TAA around parturition (-7 to 15 day) in $T_3$ and $T_4$ were significantly higher than the control group. There was 17% reduction in retention of fetal membranes (RFM) and metritis in $T_4$ than control. The post partum estrus interval averaged 58.00, 55.33, 51.83 and 43.00 days in $T_1$, $T_2$, $T_3$ and $T_4$ respectively. There was significant reduction in days open in both $T_3$ and $T_4$ in comparison to $T_1$ group (127,130 Vs.146). All the vitamin E supplemented groups showed reduction in days open than their previous lactation performance. Supplementation of vitamin E at $1,500IU\;d^{-1}$ from 60 day prepartum to 30 day post partum to buffaloes exhibited beneficial effect on plasma ${\alpha}$-tocopherol level and TAA around parturition and continuation of its supplementation at $1,000IU\;d^{-1}$ from 30 to 60 days of lactation improved post partum reproductive performance of buffaloes.

• Korean Journal of Mathematics
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• 제30권2호
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• pp.239-247
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• 2022

Let C₀[0, T] denote the Wiener space, the space of continuous functions x(t) on [0, T] such that x(0) = 0. Define a random vector $Z_{\vec{e},k}:C_0[0,\;T] {\rightarrow}{\mathbb{R}}^k$ by $$Z_{\vec{e},k}(x)=({\normalsize\displaystyle\smashmargin{2}{\int\nolimits_0}^T}\;e_1(t)dx(t),\;{\ldots},\;{\normalsize\displaystyle\smashmargin{2}{\int\nolimits_0}^T}\;ek(t)dx(t))$$ where e_j ∈ L₂[0, T] with e_j ≠ 0 a.e., j = 1, …, k. In this paper we study the conditional Fourier-Feynman transform and a conditional convolution product for a cylinder type functionals defined on C0[0, T] with a general vector valued conditioning functions $Z_{\vec{e},k}$ above which need not depend upon the values of x at only finitely many points in (0, T] rather than a conditioning function X(x) = (x(t₁), …, x(t_n)) where 0 < t₁ < … < t_n = T. In particular we show that the conditional Fourier-Feynman transform of the conditional convolution product is the product of conditional Fourier-Feynman transforms.

• E2M - 전기 전자와 첨단 소재
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• 제10권8호
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• pp.800-806
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• 1997

The behavior of de levels in rapid thermal annealed Fe-doped semi-insulating InP(100) was studied by photoinduced current transient spectrocopy(PICTS). In bulk InP, T2(Ec-0.24 eV), T3(Ec-0.30 eV) and T5(Ec-0.62 eV) traps were observed. After annealing the T2 trap was annihilated at 20$0^{\circ}C$ and recreated at 35$0^{\circ}C$. T3 trap was not affected below 40$0^{\circ}C$. With increasing temperature the concentration of T5 trap reduced and it was annihilated at 30$0^{\circ}C$. However the T1(Ec-0.16 eV) and T4(Ec-0.42 eV) traps were began to appear at 40$0^{\circ}C$and these concentrations were increased with annealing temperature. The T1 and T4 traps seem to be related to the isolated phosphorus vacancy( $V_{p}$) and $V_{p}$-indium antisite( $V_{p}$- $P_{in}$ ) or $V_{p}$-indium interstitial( $V_{p}$-I $n_{I}$) respectiely.respectiely.

• Bulletin of the Korean Chemical Society
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• 제30권7호
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• pp.1452-1458
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• 2009

The change in the electronic absorption and emission energy of 7-aminocoumarin derivatives in binary solvent mixtures has been studied. The electronic transition energy along with the Stokes' shift is correlated with the orientation polarizability of the solvent as well as the empirical solvent polarity parameters $E_T$ (30). It is observed that the emission peak shift traces the change of $E_T$ (30) value very closely in binary solvent mixtures. The emission transition more strongly depends on the solvent polarity than the absorption, which indicates the dipole moment gets larger on excitation. From the dependence of the Stokes’ shift of 7-aminocoumarins with the solvent polarity parameters and the ground state dipole moment obtained by the semi-empirical calculations, the excited state dipole moment was estimated. The fluorescence lifetime change of 7-aminocoumarins in binary solvent mixtures was measured and the results are explained in terms of molecular conformation and solvent polarity. The study indicates the empirical solvent polarity $E_T$ (30) is a good measure of microscopic solvent polarity and it probes in general the non-specific solvent interactions.

• Korean Journal of Mathematics
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• 제30권4호
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• pp.653-663
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• 2022

We study cyclic codes of length n over 𝔽_2^t. Cyclic codes can be viewed as ideals in 𝓡_n = 𝔽_2^t [x]/(xⁿ − 1). It is known that there is a unique generating idempotent for each ideal. Let e(x) ∈ 𝓡_n. If t = 1 or t = 2, then there is a necessary and sufficient condition that e(x) is an idempotent. But there is no known similar result for t ≥ 3. In this paper we give an answer for this problem.

• Journal of applied mathematics & informatics
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• 제30권1_2호
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• pp.49-56
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• 2012

In this paper we introduce two new labelings called product antimagic labeling and total product antimagic labeling for directed graphs and show the existence of the same for Cayley digraphs of 2-generated 2-groups.

• 자원환경지질
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• 제37권2호
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• pp.245-253
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• 2004

우리나라 남동해안의 대보-감포간 해안단구는 6개의 단구면으로 분류되며 이들은 각각 하위로부터 1단구(T1,0.5m), 2단구(T2, 10m), 3단구(T3, 30m), 4단구(T4, 40m), 5단구(T5, 60m), 6단구(T6, 75m)이다. 이가운데 3단구(T3)는 두개의 단구로 분류되며, 하위면을 T3b, 상위면을 T3a 정하였다. 3단구 하위면 (T3b)의 구정선을 보여주는 해식애의 발달이 뚜렷하지 않아 단구 세분이 어려운 곳은 통합하여 3단구(T3)로 정하였다. 단구형성시기를 직접적으로 지시해주는 화석은 없으나, 2단구의 퇴적층에서 OSL 연대 자료가 다량 도출되어 있으며, 이 자료를 통하여 단구 형성시기를 정할 수 있다. 2단구(T2) 퇴적층의 OSL 연대는 60-7Oka에 수렴하고 있어, 2단구의 형성시기는 MIS(산소동위원소에 의한 시대 분류)의 5a로. 추정할 수 있다. 따라서 3단구는 MIS 5e, 4단구는 MIS 7에 대비된다. 본 연구지역에서 MIS 5e인 3단구 상위면(T3a)은 현해수면으로부터 30m높게 융기되어 있으며, 따라서 이지역의 융기율은 약 0.19m/ka로 계산된다. 이와 같은 융기율은 국지적인 지구조운동에 기인한 것으로 해석되며, 이에 대한 추가 연구가 필요하다.