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김정규;김형준;전용화;최병문;서재현;김태공 인제대학교 2012 仁濟論叢 Vol.27 No.1
In organization and company managing a lot of computers, it is difficult to manage the computer system, because it is not easy to recognize exceptions of distributed workplace such as departments and laboratories. Existing computer management systems control many computers through manager using server computer for management in field. Therefore they have the characteristic of strong locality. In this paper, we develop computer remote control system which supports convenient features and non-locality to managers by broadening effective ranges of computer management. We use Web-Site and Android Platform to develop the environment of client management regardless of multiple clients and locality. Moreover, we use WMI (Windows Management Instrumentation) to recognize and control the status of client PC without a impact on computer users.
2종의 Ferrite가 혼합된 페라이트/ 고무 복합형 전파흡수체의 전파흡수특성
김한근,이수호,손무헌,박정학,사공 건 東亞大學校 1997 東亞論叢 Vol.34 No.-
In this study, the ferrite/rubber composite microwave absorbers mixed Ni-Zn ferrite and Ni₂Y ferroxplanna were prepared in order to control matching condition. The variation of the material constants(ε*, μ*) and microwave absorbing characteristics were investigated with various ferrite mixing ratio. The material constants of ferrite/rubber composite microwave absorber could be controlled by variation ferrite mixing ratio.
폴록사머 및 프로필렌글리콜을 이용한 클로트리마졸 고형 좌제의 물리화학적 특성
현경희,오유경,김정애,공경환,김지현,양준호,배명수,김호동,이종달,장현욱,용철순,최한곤 한국약제학회 2005 Journal of Pharmaceutical Investigation Vol.35 No.2
To develop a clotrimazole-loaded solid suppository with poloxamer and propylene glycol, the melting points of various formulations composed of poloxamer 188 (P 188) and propylene glycol were investigated. The dissolution study of clotrimazole delivered by the suppository composed of P 188 and propylene glycol was performed. The mixtures composed of P 188 and propylene glycol were homogeneous. Propylene glycol affected the melting points of poloxamer mixtures. In particular, the mixture [P 188/propylene glycol (70/30%)] with the melting point of about 32°C was a solid form at room temperature and instantly melted at physiological temperature. Furthermore, propylene glycol affected greatly the dissolution rates of clotrimazole from the suppository. Dissolution mechanism analysis showed the dissolution of clotrimazole was proportional to the time. Our results indicated that the solid suppository with P 188 and propylene glycol would be a candidate of rectal dosage form for clotrimazole.
전자빔 조사에 따른 In_2O3/Ti 적층박막의 전기적, 광학적 특성 변화
문현주 ( Hyun Joo Moon ),전재현 ( Jae Hyun Jeon ),송영환 ( Young Hwan Song ),오정현 ( Jung Hyun Oh ),공태경 ( Tae Kyung Gong ),최동혁 ( Dong Hyuk Choi ),손동일 ( Dong Il Son ),김대일 ( Daeil Kim ) 한국열처리공학회 2015 熱處理工學會誌 Vol.28 No.6
We have considered the influence of electron irradiation on the optical and electrical properties of In_{2}O_{3}/Ti bi-layered films prepared with RF and DC magnetron sputtering. The In_{2}O_{3}/Ti thin films irradiated at 600eV shows the lowest resistivity of 6.9 × 10^{-4}Ωcm. The optical transmittance in a visible wave length region also influenced with the electron irradiation energy. The film that electron irradiated at 600 eV shows 82.9% of optical transmittance in this study. By comparison of figure of merit, it is concluded that the opto-electrical performance of In_{2}O_{3}/Ti bi-layered film is improved with electron irradiation. (Received October 13, 2015; Revised October 19, 2015; Accepted October 29, 2015)
식물성 유용물질을 함유하는 초분자체 화장제재의 콜라겐 증가 및 육모효과
조현남 ( Hyun-nam Cho ),유동찬 ( Dong-chan Yoo ),김경란 ( Kyoung-ran Kim ),변혜정 ( Hae-jung Byun ),김정현 ( Jung-hyun Kim ),박혜빈 ( Hye-bin Park ),방대석 ( Dae-suk Bang ),양선아 ( Seun-ah Yang ),강공원 ( Gong-won Khang ),지광환 대한화장품학회 2012 대한화장품학회지 Vol.38 No.1
약용식물은 피부와 모발을 보호하는 잠재적 기능을 가지고 있다고 알려져 있다. 수용성 호스트 β-cyclodextrin 과 약용식물의 기능성 성분들과의 복합체 형성 시 나타나는 피부와 모발에 미치는 효과에 대하여 조사하였다. 기존의 연구에서 복합체 형성물의 무독성, 그리고 그람양성균과 비듬을 발생시키는 곰팡이에 대한 항균기능성을 확인하였다. 본 연구에서는 약용식물의 기능성 성분을 함유한 크림이 피부의 콜라젠 생성을 유도하여 피부의 생리활성을 증대시킴을 확인하였다. 또한 기능성 성분을 함유한 헤어토닉 처리군에서 육모의 성장이 증진되었음을 생쥐를 이용한 동물실험에서 확인하였다. 본 연구 결과, 비수용성 약용성분을 수용성 β-cyclodextrin에 포접시켜 초분자 복합체 형성을 통해, 육모기능의 향상과 피부노화지연 등 부가적 화장제재로의 개발가능성을 보여주었다. Medicinal herbs have been shown to have protective functions for skin and hair. We investigated the effects of complex of soluble β-cyclodextrin and phytochemicals on the functions of skin and hair. In previous report, we evaluated the safety of supramolecules and found their anti-microbial effects and anti-fungal effect against Gram (+) and Malassezia furfur which is known to cause dandruff. Here we present that functional supramolecules-containing cream promotes the biological skin activity by inducing the collagen formation. And treatment of supramolecules-containing hair tonic increased the rate of hair growth of mouse. Taken together, supramolecular cosmetic compounds containing water insoluble phytochemicals and water soluble β-cyclodextrin exhibit the potential ability for hair growth promotion and delaying the aging of skin.
폐기물 합성가스의 수성가스전이(WGS) 반응을 위한 Pt 촉매 연구
최현정 ( Hyun-jung Choi ),공지현 ( Ji-hyun Gong ),전경원 ( Kyung-won Jeon ),장원준 ( Won-jun Jang ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2020 No.-
본 연구에서는 폐기물 합성가스로부터 수소 생산을 위해 다양한 담체(CeO<sub>2</sub>, ZrO<sub>2</sub>, MgO, Al<sub>2</sub>O<sub>3</sub>, MgO-Al<sub>2</sub>O<sub>3</sub>)에 Pt를 담지시켜 수성가스전이(Water gas shift, WGS) 반응용 Pt 기반 촉매를 제조하였다. 다양한 담체에 함침법으로 Pt를 담지시켜 촉매를 제조하였다. 240~400℃의 온도와 40,206 h<sup>-1</sup>의 높은 공간속도에서 촉매 성능을 평가하였다. 특성 분석 결과에 따르면, 제조된 Pt 촉매는 담체에 따라 주로 환원 특성이 영향을 받았으며 부분적으로는 Pt 분산도가 영향을 받은 것으로 확인되었다. WGS 반응 결과에 따르면, Pt촉매 중 Pt/CeO<sub>2</sub> 촉매가 가장 높은 CO<sub>2</sub> 선택도와 CO 전환율을 나타내어 가장 높은 성능을 보였다. 이 결과는 Pt/CeO<sub>2</sub> 촉매의 쉬운 산화·환원 능력과 CeO<sub>2</sub>의 산소이동 및 산소 저장 능력 때문에 나타난 결과로 확인되었다.
2020 Seoul Consensus on the Diagnosis and Management of Gastroesophageal Reflux Disease
( Hye-Kyung Jung ),( Chung Hyun Tae ),( Kyung Ho Song ),( Seung Joo Kang ),( Jong Kyu Park ),( Eun Jeong Gong ),( Jeong Eun Shin ),( Hyun Chul Lim ),( Sang Kil Lee ),( Da Hyun Jung ),( Yoon Jin Choi ) 대한소화기기능성질환·운동학회 2021 Journal of Neurogastroenterology and Motility (JNM Vol.27 No.4
Based on a meta-analysis of 19 estimated acid-exposure time values in Asians, the reference range upper limit for esophageal acid exposure time was 3.2% (95% confidence interval, 2.7-3.9%) in the Asian countries. Esophageal manometry and novel impedance measurements, including mucosal impedance and a post-reflux swallow-induced peristaltic wave, are promising in discrimination of GERD among different reflux phenotypes, thus increasing its diagnostic yield. We also propose a long-term strategy of evidence-based GERD treatment with proton pump inhibitors and other drugs. (J Neurogastroenterol Motil 2021;27:453-481)
공지현 ( Ji-hyun Gong ),최현정 ( Hyun-jung Choi ),전경원 ( Kyung-won Jeon ),장원준 ( Won-jun Jang ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2020 No.-
본 연구에서는 폐기물 합성가스로부터 수소 생산을 위한 수성가스전이(Water gas shift, WGS)반응에 다양한 담체(CeO<sub>2</sub>, ZrO<sub>2</sub>, MgO, Al<sub>2</sub>O<sub>3</sub>)를 이용하여 제조된 Cu 기반 촉매를 적용하였다. 촉매는 공침법으로 제조하였으며, WGS 반응을 수행하고 담체 특성이 촉매 활성에 미치는 영향을 확인하였다. 제조된 Cu 기반 촉매는 담체종류에 따라 환원 특성과 금속-담체간의 상호작용, Cu 분산도에 차이를 보였다. 촉매 성능을 평가한 결과에 따르면, Cu-CeO<sub>2</sub> 촉매가 높은 공간속도인 40,206 h<sup>-1</sup>에서 20시간 동안 비활성화 없이 가장 안정적인 CO 전환율을 보였다. 모든 온도 영역에서 부반응이 발생 없이 100% CO<sub>2</sub> 선택도를 나타내었다. 이것은 Cu-CeO<sub>2</sub> 촉매의 쉬운 산화환원능력과 CeO<sub>2</sub>의 산소이동 및 저장능력 때문에 나타난 결과이다.
Gong, Su-Cheol,Ryu, Sang-Ouk,Bang, Seok-Hwan,Jung, Woo-Ho,Jeon, Hyeong-Tag,Kim, Hyun-Chul,Choi, Young-Jun,Park, Hyung-Ho,Chang, Ho-Jung The Korean Microelectronics and Packaging Society 2009 마이크로전자 및 패키징학회지 Vol.16 No.4
Two different organic-inorganic hybrid thin film transistors (OITFTs) with the structures of glass/ITO/ZnO/PMMA/Al (staggered structure) and glass/ITO/PMMA/ZnO/Al (inverted staggered structure), were fabricated and their electrical and structural properties were compared. The ZnO thin films used as active channel layers were deposited by the atomic layer deposition (ALD) method at a temperature of $100^{\circ}C$. To investigate the effect of the substrates on their properties, the ZnO films were deposited on bare glass, PMMA/glass and ITO/glass substrates and their crystal properties and surface morphologies were analyzed. The structural properties of the ZnO films varied with the substrate conditions. The ZnO film deposited on the ITO/glass substrate showed better crystallinity and morphologies, such as a higher preferred c-axis orientation, lower FWHM value and larger particle size compared with the one deposited on the PMMA/glass substrate. The field effect mobility ($\mu$), threshold voltage ($V_T$) and $I_{on/off}$ switching ratio for the OITFT with the staggered structure were about $0.61\;cm^2/V{\cdot}s$, 5.5 V and $10^2$, whereas those of the OITFT with the inverted staggered structure were found to be $0.31\;cm^2/V{\cdot}s$, 6.8 V and 10, respectively. The improved electrical properties for the staggered OITFTs may originate from the improved crystal properties and larger particle size of the ZnO active layer.