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      • SCOPUSKCI등재

        Finn Chamber Occlusion 과 Histometry 를 사용한 수종 스테로이드제의 표피 위축에 대한 관찰

        양준모,은희철,이유신,서명수,천영일 대한피부과학회 1986 大韓皮膚科學會誌 Vol.24 No.5

        The aim of this stud y was to compare the epidermal thinning properties of four corticosteroid ointments applied under occlusion, using histology and histometry. The results were surnmerized as follows: 1.The stratum corneurn was dramatically thinned, appearing as a wispy layer of horny cells as apposed to the norrnal basket-weave configuration. this effect was prominent at sites treated with clobestasol propionate, fluocinonide, and fluocinolone acetonide. 2. With the histometry, visible epidermal thickness wa.s markedly reduced. This effect w is prominent in the following ascending order: fluocinolone acetonide, fluocienonide, clobestasol-17-propionate. Hydrocortisone was the least atrophogenic. 3. Clohestasol-17-propionate and fluocinonide caused significant flattening of der- mo-epidermal junction, Fluocinolone acetonide and hydrocortisone caused less pronounced cbanges. 4. Marked capillary dilation af papilly dermis is caused by clobestasol-17-propionate, fluocinonide and fluocinolone acetonide.

      • KCI등재

        다공성 탄소나노재료를 사용하는 Capacitive Deionization 공정의 염수 제거효과

        양천모,최운혁,조병원,조원일,윤경석,한학수 한국공업화학회 2004 공업화학 Vol.15 No.3

        다공성 탄소재료를 이용하여 만든 전극을 사용해서 전기화학적으로 이온을 흡착시켜 제거시키는 capacitive deionization (CDI) 특성을 다공성 탄소재료의 종류에 따라서 조사하였다. CDI에 의한 담수화는 충전 시, 두 개의 다공성 탄소전극에 적절한 전압을 인가하고 그 사이로 이온들이 함유된 물을 흘려주어 양이온은 음극에, 음이온은 양극에 흡착되어 이온들이 서로 분리되고, 양이온과 음이온으로 포화된 탄소전극은 반대 전압을 인가하거나 탄소전극을 서로 연결(Short circuit)해주면 흡착된 이온들이 탈리되는 원리이다. 다공성 탄소 전극 재료로는 탄소에어로젤 (specific surface area : 950 ㎡/g, pore volume : 3.71 ㏄/g, pore diameter : 15.19 ㎚)과 활성탄소(BP-25: specific surface area 2500 ㎡/g, Kansai Coke & Chemicals Co. Ltd), 탄소나노튜브(MWNT type, 10~20 ㎚ diameter, ILJIN Nanotach), 그리고 탄소나노섬유(straight type, 130~150 ㎚ diameter, Nanomirae Co. Ltd)를 전극 활물질로 사용하여 침지법으로 CDI용 탄소전극을 각각 제조하였으며, 0.9 V 충전과 -0.001 V 방전, 휴기(rest) 과정을 1회로 하여 CDI 특성을 탄소전극 활물질의 종류에 따라 10회 동안 조사하였다. 충전과 방전 시 평균 전하량은 활성탄소를 이용한 전극에서 각각 0.229〔Aㆍmin〕와 0.143〔Aㆍmin〕으로 가장 높았으며, 활물질의 양을 고려한 평균 방전 비전하량의 경우, 전극 활물질로서 탄소에어로젤이 0.593〔Aㆍmin〕으로 가장 높게 나타났다. 10회 충-방전 싸이클에 대한 전하량 효율은 탄소에어로젤이 63.98%로 가장 우수하였으며, 활성탄소(62.45%)와 탄소나노섬유(56.50%)도 비교적 안정하게 나타났다. Capacitive deionization (CDI) process is a removal process of ions via electrochemical adsorption using porous carbon materials. The ions are adsorbed onto the surface of porous carbon electrodes by applying electric field to brackish water. Adsorbed ions are desorbed from the surface of the porous carbon electrdes by eliminating the field or reversing electric field, resulting in the regeneration of electrodes. Recently, carbon aerogel electrodes, one of the porous carbon materials, are bring used for CDI process. In this study, the electrode using carbon aerogel (specific surface area: 960m^(2)/g, pore volume: 3.71 cc/g, and pore diameter: 15.19 nm), activated carbon(BP-25: specific surface 2500m^(2)g, frpm Kansai Cole & Chemicals Co. Ltd), carbon nanotube (MMMT type, 10-20 nm diameter, from ILJIN Nanotech) and carbon nanofiber (straight type, 130∼150 nm diameter, from Nanomirae Co. Ltd) were fabricated by dip coating method. Porous carbon electrodes were charged at 0.9 V, discharged at -0.001 V, cycled 10 times, and their CDI performances were compared with CDI characteristics. An activated carbon electrode showed higher average charge and discharge coulombs than others and its average charge and discharges were 0.229 [Aㆍmin] and 0.143 [Aㆍmin], respectively. At the average discharge specific-coulombs, a carbon aerogel electrode had highest average specific discharge coulomb of 0.593 [(Aㆍmin)/g]. The values of coulombic-efficiencies showed 63.98% for the carbon aerogel electrode, 62.45% for the activated carbon, and 56.50% for the carbon nanofiber.

      • SCOPUSKCI등재

        Poly[(ethylene glycol) diacrylate]-Poly(vinylidene fluoride) 전해질을 이용한 전기 이중층 캐패시터의 전기화학적 특성

        양천모,이중기,조원일,조병원,주재백,유관표,임병오 한국공업화학회 2002 공업화학 Vol.13 No.8

        자외선 경화법으로 제조한 PEGDA-PVdF 젤상 고분자 전해질을 전기이중층캐패시터에 적용하였고, 액상 유기 전해질을 이용한 전기이중층캐패시터와 전기화학적 특성을 비교 조사하였다. 자외선 경화법으로 제조된 젤상 고분자 전해질[GPE:poly[(ethylene glycol) diacrylate]-poly(vinylidene fluoride) blend]을 이용한 전기이중층캐패시터의 경우, 비축전용량이 120 F/g으로 액상 유기 전해질 [LOE:1 M LiPF_6/EC:DMC:EMC (1:1:1 volume ratio)]을 이용한 전기이중층캐패시터의 비축전용량인 110 F/g보다 우수하였고, 100회 충방전 후에도 초기 비축전용량대비 92% 이상 유지하는 우수한 싸이클 특성을 나타내었으며 3.7 Ω의 낮은 ESR(equivalent series resistance)을 보여주었다. Cyclic voltammetry 분석 결과에서 보면 액상 유기 전해질과 젤상 고분자 전해질을 이용한 모든 전기이중층캐패시터에서 2.5 V까지 전해질의 분해 없이 전기화학적으로 안정하였고, 산화와 환원과 관련된 전류값 또한 관찰되지 않았다. 젤상 고분자 전해질을 이용한 전기이중층캐패시터의 경우에서 직사각형 모양의 이상적인 전기이중층캐패시터의 특성과 49 ㎂의 낮은 누설 전류값을 나타내었다. 자가방전 특성 결과, 젤상 고분자 전해질을 이용한 전기이중층캐패시터의 경우 2.5 V의 정전압 충전 시 OCV(open circuit voltage) 상태에서 100 h 경과 후 1.76 V의 전압을 유지하고 있어 0.25 V의 액상 유기 전해질을 이용한 전기이중층캐패시터보다 매우 우수함을 확인하였다. Poly[(ethylene glycol) diacrylate] (PEGDA)-poly(vinylidene fluoride) (PVdF) gel polymer was employed as an electrolyte for electric double layer capacitor (EDLC) and compared its electrochemical characteristics with that of liquid organic electrolyte. The used organic electrolyte was 1 mole of lithium hexafluorophosphate (LiPF_6) salt containing in the solvent mixture of ethylene carbonate(EC):dimethyl carbonate(DMC):ethylmethyl carbonate(EMC)(1:1:1 volume ratio). The specific capacitance of EDLC with gel polymer electrolyte showed 120 F/g, which was superior to that of 110 F/g with liquid organic electrolyte. Good cyclability was observed for gel polymer electrolyte of EDLC. The 92% of initial specific capacitance was retained after 100 cycles of charge-discharge runs. Equivalent series resistance of 3.7 Ω of the EDLC with gel polymer electrolyte was lower than that of EDLC with liquid organic electrolyte. The EDLC with gel polymer electrolyte exhibited rectangular cyclic voltammogram of ideal EDLC in operating voltage range of 0∼2.5 V and low leakage current of 49 ㎂. Voltage drop from self-discharge was low for gel polymer electrolyte. The 29.6% of initial voltage decreased for gel polymer electrolyte, but significantly decreased to 99% for liquid organic electrolyte. The good retentivity with gel polymer electrolyte possible comes from the difference in viscosity compared with that of liquid organic electrolyte.

      • KCI등재후보

        스피넬상 Fe₃O₄를 이용한 CO₂ 분해에서 LiMn₂O₄ 첨가효과

        양천모(Chun Mo Yang),박영구(Young Goo Park),조영구(Young Koo Cho),임병오(Byung O Rim) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.3

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        The spinel Fe₃O₄ powders were synthesized using 0.2 M-FeSO₄·7H₂O and 0.5 M-NaOH by oxidation in air and the spinel LiMn₂O₄ powders were synthesized at 480℃ for 12 h in air by a sol-gel method using manganese acetate and lithium hydroxide as starting materials. The synthesized LiMn₂O₄ powders were mixed at portion of 5, 10, 15 and 20 wt% of Fe₃O₄ powders using a ball-mill. The mixed catalysts were dried at room temperature for 24 hrs. The mixed catalysts were reduced by hydrogen gas at 350℃ for 2 h. The carbon dioxide decomposition rates of the mixed catalysts were 90% in all the mixed catalysts but the decomposition rate of carbon dioxide was increased with adding LiMn₂O₄ powders to Fe₃O₄ powders.

      • KCI등재후보

        CO₂ 분해용 촉매 CuO-Magnetite 및 ZnO-Magnenetite 합성

        양천모(Yang Chun Mo),임병오(Rim Byung O) 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.2

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        The Cuo-Magnetite and ZnO-Magnetite catalysts with various of Cuo and ZnO mole% for Carbon Dioxide decomposed reaction synthesized. The catalysts were reduced by H₂ at 350℃ for 3 hours. The temperature was obtained by TGA and DSC experiments. The structures of catalysts were confirmed by X-ray diffraction experiment. The surface area of catalysts is 15~27 m²/g. The results of Carbon Dioxide decomposed ability was better H₂-reduced magnetite catalysts with 0.03 mole% CuO and 0.03 mole% ZnO than others catalysts. After Carbon Dioxide decomposed reaction, catalysts were reacted H₂ and created only methane.

      • KCI등재후보

        CuO-Magnetite 및 ZnO-Magnetite 촉매상에서 $CO_2$ 수식 이미지 분해반응속도론

        양천모(Yang, Chun-Mo),임병오(Rim, Byung-O) 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.4

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        $Cu_xFe_{3-x}O_4$ 수식 이미지 catalyst and $Zn_xFe_{3-x}O_4$ 수식 이미지 catalyst were synthesized by the air oxidation method with various C(II) and Zn(II) weights. Activated catalysts decomposed carbon dioxide to carbon at $350^{\circ}C$ 수식 이미지, $380^{\circ}C$ 수식 이미지, $410^{\circ}C$ 수식 이미지 and $440^{\circ}C$ 수식 이미지. The value of carbon dioxide decomposition rate for $Cu_{0.003}Fe_{2.997}O_4$ 수식 이미지 and $Zn_{0.003}Fe_{2.997}O_4$ 수식 이미지 catslysts than was better catalysts. The decomposed rate of the catalysts is about 85%${\sim}$ 수식 이미지90%. The reaction rate constant(4.00 $psi^{1-{\alpha}}/min$ 수식 이미지) and activation energy(2.62 kcal/mole) of $Cu_{0.003}Fe_{2.997}O_4$ 수식 이미지 catalyst are better than $Zn_{0.003}Fe_{2.997}O_4$ 수식 이미지

      • KCI등재후보

        CO$_2$ 수식 이미지 분해용 촉매 CuO-Magnetite 및 ZnO-Magnenetite 합성

        양천모(Yang, Chun-Mo),임병오(Rim, Byung-O) 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.2

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        The Cuo-Magnetite and ZnO-Magnetite catalysts with various of Cuo and ZnO mole% for Carbon Dioxide decomposed reaction synthesized. The catalysts were reduced by $H_2$ 수식 이미지 at $350^{\circ}C$ 수식 이미지 for 3 hours. The temperature was obtained by TGA and DSC experiments. The structures of catalysts were confirmed by X-ray diffraction experiment. The surface area of catalysts is $15{\sim}27\;m^2/g$ 수식 이미지. The results of Carbon Dioxide decomposed ability was better $H_2-reduced$ 수식 이미지 magnetite catalysts with 0.03 mole% CuO and 0.03 mole% ZnO than others catalysts. After Carbon Dioxide decomposed reaction, catalysts were reacted $H_2$ 수식 이미지 and created only methane.

      • KCI등재후보

        Zn_xFe_(3-χ)O_(4-δ)를 이용한 이산화탄소의 분해

        양천모(Chun Mo Yang),조영구(Young Koo Cho),임병오(Byung O Rim) 한국유화학회 2000 한국응용과학기술학회지 Vol.17 No.1

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Zn_χFe_(3-χ)O_4(0.003<X<0.08) was synthesized by air oxidation method for the decomposition of carbon dioxide. We investigated the characteristics of catalyst, the form of methane by gas chromatograph after decomposition of carbon dioxide and kinetic parameter. Zn_χFe_(3-χ)O_4(0.003<X<0.08) was spinel type structure. The surface areas of catalysts(Zn_χFe_(3-χ)O_4(0.003<X<0.08)) were 15~27 ㎡/g. The shape of Zn_0.003Fe_2.997O_4 was sphere. The optimum temperature for the decomposition of carbon dioxide into carbon was 350℃. Zn_0.003Fe_2.997O_4 showed the 85% decomposition rate of carbon dioxide and the degree of reduction by hydrogen(δ) of Zn_0.003Fe_2.997O_4 was 0.32. At 350℃, the reaction rate constant and activation energy of Zn_0.003Fe_2.997O_3.68 for the decomposition of carbon dioxide into carbon were 3.10 psi^(1-α)/min and 0.98 kcal/mole respectively. After the carbon dioxide was decomposed, the carbon which was absorbed on the catalyst surface was reacted with hydrogen and it became methane.

      • KCI등재후보

        CO₂ 분해용 스피넬상 LiMn₂O₄ 에 대한 Fe₃O₄ 첨가효과

        양천모(Chun Mo Yang),임병오(Byung O Rim),김승호(Seung Ho Kim),김순태(Soon Tae Kim) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.3

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        The spinel LiMn₂O₄ powders were synthesized at 480℃ for 12 h in air by a sol-gel method using managanese acetate and lithium hydroxide as starting material and the Fe₃O₄ powders were synthesized by the precipitation method using 0.2M-FeSO₄·H₂O and 0.5M-NaOH. The synthesized Fe₃O₄ powders were mixed at portion of 5, 10, 15 and 20 wt% about LiMn₂O₄ powders through ball-milling followed by drying at room temperature for 48 h in air. The mixed catalysts were reduced at 350℃ for 3 h by hydrogen and the decomposition rate of carbon dioxide was measured at 350℃ using the reduced catalysts. As the results of CO₂ decomposition experiments, the decomposition rates of carbon dioxide were 85% in all catalysts but the initial decomposition rates of CO₂ were slightly high in the case of the 5%-Fe₃O₄ added catalyst.

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