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장철호,강금위,김종길 圓光大學校 醫科學硏究所 1996 圓光醫科學 Vol.12 No.2
The middle cranial fossa approach can be used to expose the internal acoustic canal and labybithine segments of the facial nerve when preserving existing auditory function is desirable. The geniculate ganglion and tympanic portions of the nerve can also be decompressed from a using this approach. However, this technique requires complete acknowldegement of the complex three-dimensional anatomy of the temporal hone and the skull base. Recently we performed this technique in the case of the temporal bone fracture with facial nerve paralysis. We got succesful result, so we report our experience with the review of the literature.
Investigation of Butyl Group Transfer Reaetions of t-Butyl Catechol over Solid Acid Catalysts
Lee, Chul Wee,Park, Sang Eon,Wang, Bo,Cai, Tian Xi 한국공업화학회 2000 Journal of Industrial and Engineering Chemistry Vol.6 No.3
The butyl group transfer reactions of t-butyl catechols were investigated over the zeolite HBEA and super acid SO₄/ ZrO₂. Melting a physical mixture of 3,5-di-tert-butylcatechol (DTBC), catechol and/or 4-tert-butylcatechol (4-TBC) produced a significant conversion, resulting from the thermal reaction. HBEA exhibits a good conversion and selectivity on 4-TBC through the transalkylation of DTBC and catechol. The super acid sulfated zirconia, SO₄/ZrO₂, due to its strong acidity, favors the dealkylation and disproportionation of 4-TBC or/and DTBC, preventing the increase of the selectivity on 4-TBC.
Lee, Chul-Wee,So, Hyun-Soo,Lee, Kyu-Ryong Korean Chemical Society 1986 Bulletin of the Korean Chemical Society Vol.7 No.2
The solution epr spectra of ${\alpha}-1,2,3-[H_nPV(IV)V_2W_9O_{40}]^{(7-n)-}$were measured at various pH and three protonated species have been identified. The spectrum of $H_3PV(IV)Ⅴ_2$ consisting of 8 lines indicates that the V-OH-V bridge prevents effectively the electron transfer between the vanadium atoms. The spectrum of $H_2PV(IV)V_2$ consisting of 15 lines can be interpreted by assuming that the electron is hopping fast between the two vanadium atoms in the V-O-V sequence. The multi-line spectrum of $HPV(IV)V_2$ is interpreted as a poorly resolved 43-line spectrum which originates from the electron hopping among the three vanadium atoms with the forward and backward transition probabilities of 4:1 in the OH-V-O-V sequence.
Lee, Chul-Wee Korean Magnetic Resonance Society 2002 Journal of the Korean Magnetic Resonance Society Vol.6 No.2
The chalcogenide glass (ALS, $Al_2S_3-La_2S_3$) was prepared by melting a stoichiometric mixture of aluminum powder and $La_2S_3$ under $H_2S$ atmosphere at $1200{\circ}C$. Glasses containing 0.1-0.1% of $Mn^{2+},\;Gd^{3+}$ and $Cu^{2+}$ were also prepared. The characteristic features of the ESR spectra for the transition metal containing ALS glasses are interpreted.
Lee, Chul Wee,Yu, Jong-Sung,Larry Kevan 순천대학교 기초과학연구소 1992 基礎科學硏究誌 Vol.3 No.-
Dehydration, oxidation-reduction, and adsorbate (D_2O, CD_3OH, CO) interactions of PdSAPO_11 prepared by adding Pd(NH_3)_4Cl_2 during the synthesis of SAPO-11 have been studied and compared with (S)PdH-SAPO-11 and (i) PdH-SAPO-11 where (S) and (i) refer to solid-state ion exchange and impregnation, respectively. Diffuse reflectance spectra, electron spin resonance (ESR), and electon spin echo modulation (ESEM) spectroscopies are almost the same for the three differently prepared Pd-containing samples. ESR spectra of dehydrated samples at 600℃ show g_1=2.9 and 2.6 and g_1=2.1, which are assigned to two Pd(I) species. Adsorption of water on dehydrated samples induces decomposition of water and the formation of a Pd-oxygen radical complex. ESEM shows that, after adsorption of CD_3OH, the g_1=2.9 component of Pd(I) disappears and the g_1=2.6 Pd(I) coordinates to one methanol with a Pd-D distance of 0.39-0.40 nm. Pd(II) in SAPO-11 is reduced to Pd(I) by CO and forms at least two different Pd(I)-carbonyl complexes. Within the range of 0.5-1.0 mol % Pd in PdSAPO-11, it is most probable that the Pd ions are not in framework positions.
Epr Study of the 10-Tungsto-2-vanado(Ⅳ, Ⅴ)phosphate Anion, [PV(Ⅳ)VW$_{10}O_{40}]^{6-}$
Lee, Chul-Wee,So, Hyun-Soo,Lee, Kyu-Ryong Korean Chemical Society 1986 Bulletin of the Korean Chemical Society Vol.7 No.1
The polycrystalline epr spectrum of ${\alpha}-1,\;2-[PV(IV)VW_{10}O_{40}]^{6-}$ doped into host crystals and its solution spectrum are reported. The solution spectrum consists of fifteen lines, indicating that the unpaired electron is hopping fast between the two vanadium atoms. The polycrystalline spectrum, which consists of three sets of fifteen lines, was analyzed as a spectrum of an I = 7 system and the epr parameters were determined. The spectrum cannot be interpreted by assuming that each line appears at the average magnetic field of two hyperfine lines expected for two uncoupled vanadium atoms.
Reactions of Oxomolybdenum (Ⅴ) with the 17-tungsto-2-phosphate Anion
Lee, Chul-Wee,So, Hyun-Soo Korean Chemical Society 1984 Bulletin of the Korean Chemical Society Vol.5 No.4
Reactions of $MoOCl_5^{2-}$ with ${\alpha}_2-[P_2W_{17}O_{61}]^{10-}$ have been studied spectrophotometrically and several complexes have been identified. The transient species initially formed is probably $[Mo_2O_4(P_2W_{17}O_{6l})_2]^{18-}$. At $pH {\le} 3$the visible spectrum changes gradually, indicating formation of a transient isomer of $[P-2Mo^VW_{17}O_{62}]^{7-}$, which again transforms into the stable isomer. The transient isomer absorbs light much more strongly than the stable isomer in the visible range. At $pH > 3 [P_2W^VW_{16}O_{61}]^{11-}$ is formed probably via the transient isomer of $[P_2Mo^VW_{17}O_{61}]^{7-}$.
O-Acylation of Heteropolyanions Containing Two Adjacent Vanadium Atoms
Lee, Chul-Wee,So, Hyun-Soo,Lee, Kyu-Ryong Korean Chemical Society 1988 Bulletin of the Korean Chemical Society Vol.9 No.6
Reaction of Keggin- or Dawson-type heteropolyanions containing two adjacent vanadium atoms with acetic anhydride in the presence of acid produced acylated anions. Heteropolyanions with one or no vanadium atom do not react under the same conditions, indicating that the acyl group is attached to the bridging oxygen atom between the two vanadium atoms. A characteristic infrared band at 1760 $cm^{-1}$ was observed for the acylated anions. The 8-line EPR spectrum shows that one of the vanadium atoms is reduced to V(IV ). The acylated heteropolyanions are easily hydrolyzed, and its acyl group can also be transferred to aniline.