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Zeolite X 촉매를 이용한 WO₃의 CO 환원-탄화반응
이동활,이종대,전진혁,박노국,류시옥,이태진 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.2
This study was performed to manufacture tungsten carbide from CO reduction- carburization of WO₃using zeolite-NaX catalyst. Zeolite-NaX catalyst could improve the reduction property of WO₃. Moreover, zeoite-HX and KX catalysts also improved the reduction property of WO₃. This improvement of reduction property leaded to the decrease of reaction temperature. The size of WC particle was 50∼60 nm at 650 ℃ for 10h. From these results, it is concluded that the various zeolite X catalysts could be used for the reduction-carburization of W0₃ as the catalysts.
기포유동층 반응기 내에서 천연제올라이트를 사용한 아연계 탈황제의 반응특성연구
김동현,정용길,박노국,이종대,전진혁,류시옥,이태진 한국공업화학회 2003 응용화학 Vol.7 No.2
To improve attrition resistance, calcium oxide was added to durable ZZF sorbent. It was named ZZFCa sorbent. The reactivity of ZZFCa sorbent was investigated in the fluidized-bed reactor. The influencesof the sulfur capacity and the regeneration time for various fluidization velocities from 0.07㎧ to 0.20㎧ were investigated for 5-cycles. As a result, ZZFCa sorbent appeared the high sulfur capacity abouve 10gS/100g sorbent. The sulfur capacity of ZZFCa was maintained, although fluidization velocities increased.
장수진,류동균,원충연,이진국,배기훈,김수석 성균관대학교 2003 학술회의지원논문목록집 Vol.2003 No.-
A synchronous generator is equipped with an automatic voltage regulator(AVR), which is responsible for keeping the output voltage constant under normal operating conditions at various levels. The output voltage of Synchronous Generator is regulated constantly by field voltage control in excitation system. High frequency PWM converter (Buck converter) type excitation system for synchronous generator that can sustain proper output voltage level even at the fault condition happened. The proper operation of the proposed excitation system was verified through the simulations and the experiments.
전류제어형 PWM컨버터를 이용한 동기발전기용 여자시스템에 관한 연구
장수진,류동균,서민성,김준호,원충연,이진국 성균관대학교 2003 학술회의지원논문목록집 Vol.2003 No.-
동기발전기 출력전압은 여자시스템의 계자전류 제어에 의해 일정하게 유지된다. 고주파 PWM 컨버터(전류제어모드 buck컨버더)형태의 여자시스템은 부하변동이 발생하였을 때 동기발전기의 계자전류를 제어하게 된다. 이 논문은 정상상태 및 과도상태에서의 안정화를 개선하기 위하여 여자시스템의 설계 및 실험에 대해 다루었다. 시뮬레이션 및 실험 결과는 제안된 여자시스템이 50kW 동기발전기의 DVR에 의해 응답시간이 개선되었음을 보여주었다. The output voltage of synchronous generator is regulated constantly by field current control in excitation system. High frequency PWM converter (current control mode buck conveter) type excitation system for synchronous generator is able to control exciter current when the load change happened. This paper deals with the design and evaluation of the excitation system for a synchronous generator to improve the steady state and transient stability. The simulation and experimental results show that the proposed excitation system is able to improve the response time by the DVR(digital voltage regulator) of 5O[kW] synchronous generator.
Ryu, Kwang Sun,Park, Hyun Woo,Park, Soo Ho,Shon, Ho Sun,Ryu, Keun Ho,Lee, Dong Gyu,Bashir, Mohamed EA,Lee, Ju Hee,Kim, Sang Min,Lee, Sang Yeub,Bae, Jang Whan,Hwang, Kyung Kuk,Kim, Dong Woon,Cho, Myeon Science Press 2015 Journal of geriatric cardiology Vol.12 No.3
<P><B>Background</B></P><P>The clinical significance of complete revascularization for ST segment elevation myocardial infarction (STEMI) patients during admission is still debatable.</P><P><B>Methods</B></P><P>A total of 1406 STEMI patients from the Korean Myocardial Infarction Registry with multivessel diseases without cardiogenic shock who underwent primary percutaneous coronary intervention (PPCI) were analyzed. We used propensity score matching (PSM) to control differences of baseline characteristics between culprit only intervention (CP) and multivessel percutaneous coronary interventions (MP), and between double vessel disease (DVD) and triple vessel disease (TVD). The major adverse cardiac event (MACE) was analyzed for one year after discharge.</P><P><B>Results</B></P><P>TVD patients showed higher incidence of MACE (14.2% <I>vs</I>. 8.6%, <I>P</I> = 0.01), any cause of revascularization (10.6% <I>vs</I>. 5.9%, <I>P</I> = 0.01), and repeated PCI (9.5% <I>vs</I>. 5.7%, <I>P</I> = 0.02), as compared to DVD patients during one year after discharge. MP reduced MACE effectively (7.3% <I>vs</I>. 13.8%, <I>P</I> = 0.03), as compared to CP for one year, but all cause of death (1.6% <I>vs</I>. 3.2%, <I>P</I> = 0.38), MI (0.4% <I>vs</I>. 0.8%, <I>P</I> = 1.00), and any cause of revascularization (5.3% <I>vs</I>. 9.7%, <I>P</I> = 0.09) were comparable in the two treatment groups.</P><P><B>Conclusions</B></P><P>STEMI patients with TVD showed higher rate of MACE, as compared to DVD. MP performed during PPCI or <I>ad hoc</I> during admission for STEMI patients without cardiogenic shock showed lower rate of MACE in this large scaled database. Therefore, MP could be considered as an effective treatment option for STEMI patients without cardiogenic shock.</P>
공통운용환경에서의 내장형 S/W 개발을 위한 구성요소 설계
류동국(Dong-Kuk Ryu),김우열(Woo-yeol Kim),김영철(Young-Chul Kim) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.1
항공기, 핸드폰, 자동차 등 여러 분야에서 내장형 S/W가 사용되고 있다. 내장형 S/W는 일반 S/W와는 달리 운용 및 개발 환경이 특화되고 다양하여 개발비용이 많이 들고 관리에 어려움이 있다. 이러한 문제점들을 해결하기 위하여 미군에서는 공통운용환경(Common Operating System)을 도입하여 시스템들의 통합을 용이하게 하고 상호운용성을 증진하고 있다. 공통운용환경은 운영체계 및 시스템 S/W는 표준화하고 공통으로 재사용가능한 부분을 일종의 컴포넌트라 할 수 있는 세그먼트로 개발하여 재사용하는 개발 및 운용환경을 말한다. 본 논문에서는 공통운용환경의 컴포넌트 기반 개발 방법을 소개하였다. 그리고 내장형 S/W 개발 및 운용에 필요한 내장형 공통운용환경 구조를 정의하고 세그먼트를 설계하였다.
Phytochemical Constituents of Acanthopanax senticosus (Rupr. & Maxim.) Harms Stem
Ryu, Ji-Young,Son, Dong-Wook,Kang, Jung-Il,Lee, Sang-Yun,Kim, Hyun-Su,Shin, Kuk-Hyun,Lee, Sang-Hyun The Korean Society of Medicinal Crop Science 2003 韓國藥用作物學會誌 Vol.11 No.4
Five constituents were isolated from the stem of Acanthopanax senticosus. Their structures were elucidated as (-)-sesamin (1), iso-fraxidin (2), 5-hydroxymethylfurfural (3), syringin (4) and acanthoside D (5) by spectral analysis. Among these compounds, 5-hydroxymethylfurfural (3) was isolated for the first time from this plant.
Antifibrogenic effects of tamoxifen in a rat model of periportal hepatic fibrosis
Ryu, Soo Hyung,Chung, Young-Hwa,Lee, Jae Kyun,Kim, Jeong A.,Shin, Jung Woo,Jang, Myoung Kuk,Park, Neung Hwa,Lee, Han Chu,Lee, Yung Sang,Suh, Dong Jin Blackwell Publishing Ltd 2009 Liver international Vol.29 No.2
<P>Abstract</P><P>Backgrounds/Aims</P><P>It has been reported that tamoxifen may affect hepatoma cell growth <I>in vitro</I> by suppressing transforming growth factor β-1 (TGF-β1) expression, suggesting that tamoxifen might also retard fibrogenesis. Thus, we examined whether tamoxifen might suppress TGF-β1 expression and consequently inhibit the process of hepatic fibrosis <I>in vivo</I>.</P><P>Methods</P><P>To induce periportal hepatic fibrosis, 50 male adult Sprague–Dawley rats were injected with 0.62 mmol/kg of allyl alcohol, intraperitoneally, twice a week for 8 weeks. Hepatic fibrosis scores, intrahepatic collagen levels and plasma TGF-β1 expression levels were evaluated in three groups of 10 rats orally administered tamoxifen at 1, 5 and 10 mg/kg, respectively, and in 20 controls. Messenger RNAs (mRNAs) encoding TGF-β1 and TGF-β receptors in liver tissue were semiquantified using reverse transcriptase polymerase chain reaction.</P><P>Results</P><P>Hepatic fibrosis scores decreased progressively as the dose of tamoxifen increased, resulting in a significant change in rats treated with tamoxifen at 10 mg/kg compared with controls (<I>P</I>=0.018). Intrahepatic collagen content was significantly less in the group treated with tamoxifen at 10 mg/kg compared with the control (<I>P</I>=0.045). Plasma TGF-β1 levels were also significantly lower in rats treated with tamoxifen at 10 mg/kg compared with controls (<I>P</I>=0.007). All three concentrations of tamoxifen tested decreased the expression levels of hepatic TGF-β1 mRNA and type I TGF-β receptor (TGF-β RI) mRNA to similar extents.</P><P>Conclusions</P><P>Tamoxifen seems to inhibit the process of hepatic fibrosis dose-dependently by suppressing the transcription of TGF-β1 and TGF-β RI in an experimental model of periportal hepatic fibrosis.</P>