• 제목/요약/키워드: $K_s$

검색결과 199,100건 처리시간 0.129초

(感光性 高分子에 關한 硏究 VII) Cinnamoylated Polymers의 光增感 硬化反應機構 ((Photosensitive Polymers VII) Mechanism of Photosensitized Curing Reaction of Cinnamoylated Polymers)

  • 김광섭;심정섭
    • 대한화학회지
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    • 제10권4호
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    • pp.166-174
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    • 1966
  • cinnamoylated photosensitive polymer의 광증감 경화반응기구를 반응속도론적으로 연구했다. Cinnamic acid(C)와 증감제(S)의 first excited singlet and lowest triplet energy level diagram과 증감제의 농도증가에 따른 sensitivity의 포화 등의 사실로부터 이 반응의 주요과정은 C와 S의 광 energy흡수에 의한 $C^{*(1)}$$S^{*(1)}$로의 여기, $S^{*(1)}{\to}S^{*(3)}$ intersystem crossing, S의 excimer 형성, $S^{*(3)}{\to}C^{*(3)}$ energy transfer 그리고 $C^{*(3)}$와 C의 termination 등임을 가정하고 다음 반응속도를 구했다. $-\frac{d[C]}{dt} = \frac{K_1[C]}{K_2 + [C]}[\frac{I^c_{abs}}{K_3 + [S]} + \frac{K_4[C]}{(K_5 + [C])(K_6 + [S])}(I^s_{abs} + \frac{K_7I^c_{abs}[S]}{K_8 + [S]})]$ $I^c_{abs}$$I^s_{abs}$ ;C 및 S의 광흡수율 $K_n$;상수 적외선 흡수스펙트럼 분석의 결과, Cinnamoyl 에스테르화도와 sensitivity의 관계 및 증감제의 농도와 sensitivity의 관계에 대하여 발표된 실험 data는 윗식을 만족시키므로 가정한 반응기구에 대한 뒷받침을 얻었다.

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PROPERTIES OF kth-ORDER (SLANT TOEPLITZ + SLANT HANKEL) OPERATORS ON H2(𝕋)

  • Gupta, Anuradha;Gupta, Bhawna
    • 대한수학회논문집
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    • 제35권3호
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    • pp.855-866
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    • 2020
  • For two essentially bounded Lebesgue measurable functions 𝜙 and ξ on unit circle 𝕋, we attempt to study properties of operators $S^k_{\mathcal{M}({\phi},{\xi})=S^k_{T_{\phi}}+S^k_{H_{\xi}}$ on H2(𝕋) (k ≥ 2), where $S^k_{T_{\phi}}$ is a kth-order slant Toeplitz operator with symbol 𝜙 and $S^k_{H_{\xi}}$ is a kth-order slant Hankel operator with symbol ξ. The spectral properties of operators Sk𝓜(𝜙,𝜙) (or simply Sk𝓜(𝜙)) are investigated on H2(𝕋). More precisely, it is proved that for k = 2, the Coburn's type theorem holds for Sk𝓜(𝜙). The conditions under which operators Sk𝓜(𝜙) commute are also explored.

ON INTEGRAL DOMAINS IN WHICH EVERY ASCENDING CHAIN ON PRINCIPAL IDEALS IS S-STATIONARY

  • Hamed, Ahmed;Kim, Hwankoo
    • 대한수학회보
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    • 제57권5호
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    • pp.1215-1229
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    • 2020
  • Let D be an integral domain and S a multiplicative subset of D. An ascending chain (Ik)k∈ℕ of ideals of D is said to be S-stationary if there exist a positive integer n and an s ∈ S such that for each k ≥ n, sIk ⊆ In. As a generalization of domains satisfying ACCP (resp., ACC on ∗-ideals) we define D to satisfy S-ACCP (resp., S-ACC on ∗-ideals) if every ascending chain of principal ideals (resp., ∗-ideals) of D is S-stationary. One of main results of this paper is the Hilbert basis theorem for an integral domain satisfying S-ACCP. Also we investigate the class of such domains D and we generalize some known related results in the literature. Finally some illustrative examples regarding the introduced concepts are given.

A More Effective Method of IUI

  • Lee, J.Y.;Hwang, K.J.;Chang, H.S.;Choi, H.J.;Kim, Y.B.;Cho, P.J.;Kim, M.R.
    • 대한생식의학회:학술대회논문집
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    • 대한불임학회 2001년도 제40차 춘계학술대회
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    • pp.80.1-80.1
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    • 2001
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Fabrication of 1 km Bi-2223/Ag PIT Tapes

  • Ha, H.S.;Lee, D.H.;Yang, J.S.;Choi, J.K.;Hwang, S.Y.;Kim, S.C.;Ha, D.W.;Oh, S.S.;Kwon, Y.K.
    • 한국초전도학회:학술대회논문집
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    • 한국초전도학회 2003년도 High Temperature Superconductivity Vol.XIII
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    • pp.87-87
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    • 2003
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DC~25 GHz MMIC Distributed Amplifier의 설계 (Design of a MMIC Distributed Amplifier for DC to 25 ㎓)

  • 배현철;홍주연;박덕수;김성찬;안단;채연식;이진구;윤용순;김용호
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 1999년도 하계종합학술대회 논문집
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    • pp.265-268
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    • 1999
  • In this paper, a wideband MMIC distributed amplifier was designed using the fabricated PHEMT with the unit gate width of 80 ${\mu}{\textrm}{m}$ and 4 gate fingers at our Lab. S$_{21}$ gains are 7.1 ~ 10.0 ㏈. Input and output reflection coefficients obtained from the distributed amplifier in the frequency range of DC~25 ㎓ are lower then -8 ㏈. A chip size of the designed wideband MMIC distributed amplifier is 1.9 mm $\times$ 1.1 mm.

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2회선 송전선로의 새로운 디지털 평형계전방식 (A New Digital Balance Relaying Technique in Two Parallel Transmission Lines)

  • 권기백;박철원;정호성;신명철;박재세;남시북
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 D
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    • pp.1028-1031
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    • 1997
  • This Paper Presents a new digital balance relaying technique in two Parallel transmission lines. To obtain relaying signals, selected model is simulated using EMTDC. Test results of the proposed method show efficacy.

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