Norm 공간에서 Finite Compactness에 관하여

泳 成均館大學校 基礎科學硏究所 1993 論文集 Vol.43 No.2

Pd(O)-촉매를 이용한 알릴 고리 카보네이트의 제거 및 분자간 축합반응 연구

강석구,박동철,박찬희,홍륭기 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.1

The alkyl substituted allylic cyclic carbonates 1a-d undergo elimination by using a catalytic amount of Pd(0) complex to form dienols 2 a-b. However, on treatment of the unsubstituted or phenyl substituted allylic cyclic carbonates 1e and 1f with Palladium(0) catalyst, deprotonation-elimination of π-allyl Palladium complex followed by condensation with the other π-allyl Palladium complex provided the coupled products 3a and 3b, respectively.

Pd 촉매 하에서 알릴 디올의 아릴화 연구 : 방향족 히드록시 케톤 및 페닐 치환된 알릴디올의 합성 Highly Selective Synthesis of Phenyl-Substituted Allylic Diols

강석구,정경윤,박찬희,남궁은영,김태현 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.2

The coupling reaction of iodobenzene with allylic diols in the presence of Pd(OAc)_2 and nBu_3P as catalysts using K_2CO_3 as base afforded the phenyl-substituted allylic diols. However, under the same reaction conditions with Et3N as base, phenyl-substituted α-hydroxy ketone was obtained.

선형미분방정식의 보존연산자의 구조

이상구,함윤미,송석준 성균관대학교 기초과학연구소 1996 論文集 Vol.47 No.2

In this paper, we characterize linear differential operators that. preserve the nth order linear nonhomogeneous systems of differential equations. We first show that a linear differential operator preserves the nth order linear homogeneous system with constant coefficients, and extend it to the nth order linear nonhomogeneous system of differential equations with nonconstant coefficients. Then we also show those linear preservers form a monoid, not a group. We also give a necessary and sufficient condition for the linear differential operator to have an inverse.

Na/Si(111)계의 초기 산화과정에 대한 XPS 연구

이득진,안기석,황찬국,장현덕,박종윤 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.1

X-선광 전자분광법을 이용하여 Na의 흡착에 의해 형성되는 Si(111)7×7-Na과 Si(111)3×1-Na 표면의 초기 산화과정에 대하여 연구하였다. Si(111)7×7-Na 표면은 깨끗한 Si(111)7×7 표면에 비하여 산화가 더욱 잘 일어나지만, Si(111)3×1-Na의 경우 산소와 거의 반응하지 않음을 알 수 있다. 또한 Si(111)7×7 표면과는 달리, Si(111)7×7-Na 표면에 1 ML의 Na를 흡착시키고 산소를 100L 노출한 경우 0 ls 내각 스펙트럼에 두 종류의 산소성분이 존재를 함을 알 수 있다. 산소의 노출량이 증가함에 따라 낮은 운동에너지 성분의 세기는 계속 증가를 하지만, 높은 운동에너지 쪽의 성분은 초기에 포화되었다. 이러한 0 ls 내각 스펙트럼의 변화와 Na KLL Auger peak intensity 증가로부터 Si(111) 7×7-Na 표면에 흡착되는 산소는 Si-0-Si, 그리고 Si-0-Na 두가지의 결합형태로 존재함을 예상 할 수 있다. 또한, Si(111)7×7-Na 표면에 주입되는 산소 노출량이 증가함에 따른 Na KLL Auger peak intensity가 증가하는 현상에 대하여 논의하였다. The initial oxidation of Si(111)7×7-Na and Si(111)3×1-Na surfaces have been studied by means of X-ray photoelectron spectroscopy(XPS). The Si oxidation rate of Si(111)7×7-Na surface was much enhanced more than that of the clean Si(111)7×7, but the Si(111)3×1-Na surface hardly reacted with oxygen. It shows that 0 1s peak of the Si(111)7×7-Na surfaces for 100L O_2 exposure consists of two components, coming from a different oxygen bonding configuration. From the change in intensity of two component of 0 ls and the increase of Na KLL peak intensity with increasing O_2 exposure, it is found that one component originates from Si-0-Si bonding at the lower kinectic energy and the other component comes from the Si-0-Na bonding at higher kinectic energy. Also, we have discussed a possible interpretation for the abnormally increase of Na KLL peak intensity.

노랑초파리 집단내 세대변화에 다른 Cytotype 및 P factor activity의 변화에 관한 연구

李尙源,成耆昌 성균관대학교 기초과학연구소 1997 論文集 Vol.48 No.-

Isofemale lines were estabilished from YJ island in August and September, 1990. After 15 generation, they tested for the G.D sterility by P-M system. And then, the results were compared G_1 and G_15 to cytotype conversion and P factor activity change. The results were as follows. It was analyzed to consist of M(0.3%), M' (56%), Q(42.6%) and no P strain in isofemale line(G_15). It was mainly consist of M' and Q strain like any other Korea region. And the cytotype are prevalent, though the P activity are very low in this population. During the period of 15 generation labortary culture, cytotype was transformed M cytotype (28.2% → 25.5%). And P factor activity decreased from 1.0% to 0.3%.

W(110) 표면에 CO의 흡착

이경희,유위량,한현석,부진효,이순보,곽현태 성균관대학교 기초과학연구소 1998 論文集 Vol.49 No.-

The interaction of CO with W(110) surface was investigated through LEED, TDS, and photoelectron spectroscopy using synchrotron radiation under UHV condition. After CO saturation at RT, two desorption states, called α and β , were observed at about 400 and 1150 K in thermal desorption spectra, respectively. The kinetics of 3-CO followed the first order kinetics, indicating the existence of molecular CO on W(110) surface. This is contrary to the previous results. The O 1s BE(binding energy) of CO adsorbed on W(110) surface at room temperature was 529.9 eV. On the other hand, the O 1s BE of β-CO after heating to 900 K was different from that of oxygen adsorbed W(110) surface, suggesting a different adsorption state. According to the UP valence band spectra, we observed two peaks at near -10.7 eV (4σ) and -7.0 eV (5σ+1π), indicating the molecular adsorption of CO at room temperature. Furthermore we could see the 4σ peak at the various photon energy and elevated temperatures. Comparing the energy separation, Δ(4σ-1π) , between 4σ and 1π UP peaks of chemisorbed CO, we found that an increased separation reflects an decreased C-O bond strength. Therefore on the basis of TDS and photoelectron spectroscopy, we could suggest that β state of CO on W(110) may not be dissociated and has an adsorption geometry of lying-down mode.

Culex pipiens pallens 모기의 난소에 의한 단백질 합성에 관한 연구

박영민,강석희 성균관대학교 기초과학연구소 1989 論文集 Vol.40 No.1

Culex pipiens pallens 암모기의 난소의 단백질 합성 능력에 관하여 연구하였다. 흡혈후 성장하는 암모기의 난소와 난자의 크기는 흡혈 후 10시간에 증가하기 시작하여 60시간까지 증가하였다. 흡혈한 C. pipines 암모기의 난소를 in vitro에서 ^3H-leucine 함유된 조직배양액에서 배양한 후 난소단백질을 추출하여 TCA precipitation 방법으로 정량한 결과, 흡혈 후 54시간된 난소에서 가장 많은 단백질의 합성이 일어났다. In vivo와 in vitro에서 labeled 된 단백질 그리고 지방체 조직이 합성한 단백질을 전기영동하여 비교한 결과 난황단백질과 Rf가 같은 물질이 in vitro에서 난소에 의하여 합성되는 것을 관찰하였다. 이상의 결과는 C. pipiens 암모기의 난소에서도 난황단백질이 합성될 가능성을 제시하고 있다. ^3H-leucine incorporation into protein in vitro by the mosquito, Culex pipiens pallens, has been examined buy electrophoresis method. Protein synthesis by the ovary began to rise 36 hours post blood meal and reached at the maximum level by 54 hours. Some of these labeled proteins showed Rf values corresponding to that of vitellogenins synthesized by the fat bodies. The results seem to indicate that C. pipiens ovary may be involved in the synthesis of egg proteins.

INFINITESIMAL TRANSFORMATIONS WHICH ARE RELATED TO CL-TRANSFORMATION IN SASAKIAN MANIFOLDS (2)

Eum, Sang-Seup 성균관대학교 기초과학연구소 1989 論文集 Vol.40 No.1

2n^+1 次元 사사끼多樣體 M^(2n+1)에 있어서 構造텐서를 (ø,η,g)라 할때 無限小變換 v가 코벡터場 p_i와 q_i에 對하여 ◁수식 삽입▷ (원문을 참조하세요) 에 의하여 定義되어 있다고 한다. 단 L_v는 v에 관한 리-微分演算子이다. 萬一 M^(2n+1)이 위의 變換을 許容하면 cq_i=λη_ij(λ는 常數)가 成立함을, 卽 v가 한 無限小 CL-變換임을 證明한다. 換言하면 M^(2n+1)에는 위의 變換을 滿足하고 cq_i≠λη_i, (λ는 常數)인 無限小變換은 存在하지 않음을 밝힌다.

노랑초파리에 있어서 P 인자와 염색체 재배열의 상호관련성에 관한 연구

李尙源,金世鎭,成耆昌 성균관대학교 기초과학연구소 1997 論文集 Vol.48 No.-

To analysis the relationship between P element and chromosome "rearrangement in Drosophila melanogaster under hybrid dysgenesis condition were accomplished to experiments. (1) In order to learn distribution of P element on π₂ chromosome, were tested by in situ hybridization with biotin- labeled pπ25.1 DNA probe. (2) Chromosome aberration induced under hybrid dysgenesis condition. Compared (1) with (2) data, insertion site of P element on π₂ chromosome analyzed in connection with breakpoint of chromosome aberration. The results were as follows. By in situ hybridization, the number of copies of the P element on the π₂ chromosome has determined to be 56(X →17, 2L→8, 2R→10, 3L→17 and 3R→14 respectively). Under hybrid dysgenesis, chromosome aberration induced In(2R)NS from C·t/π₂♂= × cnbw♀. This breakpoint of inversion are 52A and 56F. With analyzed to the distribution of P element on the inversion(In(2R)NS), 52A and 56F sites inserted P element. Therefore, the results suggest that deduce from the correlation between P element and chromosome aberration.