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Effect of Mokhyangsungi-tang(MHS) on antioxidative ability in human intestinal epithelial cells
김지웅,김우환,김원일,Kim, Ji-Woong,Kim, Woo-Hwan,Kim, Won-Ill The Society of Internal Korean Medicine 2001 大韓韓方內科學會誌 Vol.22 No.3
목적 : 본 연구는 목향순기탕(木香順氣湯)이 인간의 장관상피세포 계열인 Caco-2 세포에서 항산화작용을 증진시키는 효과가 있는지 검증하기 위한 실험이다. 방법 : 배양된 인간장관 세포계열인 Caco-2 세포에서 세포의 사망은 trypan blue의 소실정도에 의해 평가했으며 $H_2O_2$는 표본산화제로 사용되었다. 결과 : $H_2O_2$에서 노출된 세포들은 용량에 비례하여 세포 사망하는 결과를 보였다. 목향순기탕(木香順氣湯)은 $H_2O_2$에 의해 유발된 세포사망을 방지하였고, 0.05-1%의 농도범위에 걸쳐서 효과가 극대화되었다. 목향순기탕(木香順氣湯)과 강력한 항산화제인 DPPD는 $H_2O_2$에 의해 억제된 SOD의 활성에는 영향을 주지는 못했다. 그러나 $H_2O_2$에 의해 유발된 catalase, glutathione peroxidase, hydroperoxide 탈취효소의 활성이 감소되는 것을 억제하였다. 또한 $H_2O_2$에 의해 유발된 glutathione의 감소는 목향순기탕(木香順氣湯)과 DPPD에 의해 억제되었다. 목향순기탕(木香順氣湯)은 $H_2O_2$에 의해 유발된 ATP의 소실을 회복시켰지만 DPPD는 ATP 소실을 회복시키지 못하였다. 결론 : 이러한 결과로 볼 때 Caco-2세포에서 목향순기탕이 세포사망을 억제하는 것은 다른 기전을 통하여 항산화작용을 하는 것으로 볼 수 있다. 따라서 본 연구는 목향순기탕(木香順氣湯)이 반응성산소기에 의해 유발된 인체 위장관질환의 치료에 사용할 수 있을 가능성을 제시하고 있다.
염료 흡착 조건에 따른 염료감응형 태양전지의 전기적 특성
김지웅,이경섭,최용성,Kim, Ji-Woong,Lee, Kyung-Sup,Choi, Yong-Sung 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.11
This paper is designed to find out where power reaches the highest point as the load of solar cells varies. In addition, the current and power were measured when irradiation changes, and the correlation between current and power was investigated. On top of that, experiments were conducted with the light volume kept constant and with the incoming light angle changing in order to figure out the incoming light angle that produces the most power and to conduct analyses. It was ascertained that if the load increases, the current decreases and the voltage increases. Since the power of 0.9828[W] was the highest when measurements were done, it can be said that when a load of 30[%] is applied to the solar cells, they are the most efficient.
단결정 실리콘 태양전지 최적 운전조건을 위한 전기적 특성 분석
김지웅,최용성,이경섭,조수영,황종선,Kim, Ji-Woong,Choi, Yong-Sung,Lee, Kyung-Sup,Cho, Soo-Young,Hwang, Jong-Sun 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.8
This paper was investigated the electrical properties for optimal operating conditions of monocrystalline silicon solar cell. The output of electricity for monocrystalline solar cell was investigated according to the distances between solar cell and halogen lamp and to the resistances by the variable resistor.
부호화 효율을 고려한 고속 인터/인트라 모드 결정 알고리즘
김지웅,김용관,Kim, Ji-Woong,Kim, Yong-Kwan 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.8c
H.264/AVC 비디오 부호화 표준은 부호화 효율을 향상시키기 위하여 기존의 부호화 표준들과는 다른 새로운 부호화 기법들을 사용한다. 그러나 새로이 채택된 여러 기법들로 인해 H.264/AVC 표준 부호기의 복잡도는 극단적으로 증가하게 되었다. 특히 율-왜곡 최적화 기법에 의한 H.264/AVC의 인터/인트라 모드 결정 방법은 부호기의 복잡도를 증가시키는 가장 큰 원인 중 하나이다. 본 논문에서는 매크로블록 모드 결정 과정의 복잡도 감소 및 전체 부호화 효율 측면에서 우수함을 나타내는 데 주안점을 두며, 이에 대한 고속 매크로블록 모드 결정 알고리즘을 제안한다. 제안한 알고리즘을 적용한 실험 결과, 고속 움직임 추정/보상과 결합한 경우 최대 80%의 부호화 시간을 감소시켰으며, 평균 $8{\sim}10%$의 비트율을 감소시키는데 반해 PSNR의 변화량은 미미하여 전체 부호화 효율 또한 상승시킬 수 있었다. For the improvement of coding efficiency, the H.264/AVC video coding standard employs new coding tools compared with existing coding standards. However, due to these new coding tools, the complexity of H.2641AVC encoder is greatly increased. Specially, Inter/Intra mode decision method of H.264/AVC using RDO(rate-distortion optimization) technique is one of the most complex parts in H.264/AVC. In this paper, we focus on the complexity reduction in macroblock mode decision considering coding efficiency. From the simulation results, the proposed algorithm reduce the encoding time by maximum 80% of total, and reduce the bitrate of the overall sequences by $8{\sim}10%$ on the average compared with existing coding methods.
장결핵 치료 중 Rifampin으로 유도된 심한 혈소판 감소증 및 백혈구 감소증 1예
김지웅 ( Ji Woong Kim ),정금모 ( Gum Mo Jung ),조은영 ( Eun Young Cho ),최창수 ( Chang Soo Choi ),서검석 ( Geom Seog Seo ),조진웅 ( Jin Woong Cho ),최석채 ( Suck Chei Choi ),나용호 ( Yong Ho Nah ) 대한장연구학회 2006 Intestinal Research Vol.4 No.1
Drug induced thrombocytopenia is a relatively not uncommon and potentially serious side effect of therapy. It`s characterized by thrombocytopenia, petechia, purpuric lesions and occasionally serious bleeding such as intracranial hemorrhage. The patient was 24 year-old female who was given rifampin 600mg daily for treatment of intestinal tuberculosis. Rifampin-induced immune thrombocytopenia was occurred 25 days after initiating therapy. Platelet and leukocyte count were 23,000/mm3, 2,850/mm3, respectively. Two week after discontinuation of antituberculous medication, platelet count was recovered. We report this case with a review of literature. (Intestinal Research 2006;4:64-68)
CFD를 이용한 소규모 섬유 플랜트 내 작업자 열환경 개선방안에 관한 연구
김지웅(Kim Ji-Woong),서장후(Seo Jang-Hoo),강주원(Kang Joo-Won),양정훈(Yang Jeong-Hoon) 한국건축친환경설비학회 2013 한국건축친환경설비학회 논문집 Vol.7 No.1
In this study, we tried to understand the characteristics of thermal environment of small fiber plants. Thus, we chose a fiber plant in Gyeoung-buk to measure and analyze the thermal environment, and then selected a case of thermal comfort for workers based on problems that we indicated. Using CFD(Computational Fluid Dynamics) program, we analyzed the thermal environment. The purpose of this study is to suggest a solution of improving the thermal environment of small fiber plants. Here are the ways to improve thermal environment of workplace. First, you need to insulate Sizing machine itself to reduce radiant heat spreading to workplace. Second, Removal of finishing materials in ceiling enables hot air to go up so that the air does not distract workers. Third, using a hood, you need to ventilate hot air deliberately. Thus, thermal environment of workplace will be improved and health and work efficiency of workers will also be improved. The results of this study can be used at actual small fiber plants. The limits and research project & suggestion of this study are like these. The purpose of this study was to suggest a solution of improving the thermal environment. So, every result of analysis is focused on workers. You should not overlook damage to the products and economic loss of plant owners. That is, considering about humidity is inevitable as a way of minimizing the percentage of product damage and setting up the minimum amount of ventilation to minimize the heat loss also needs to be considered as a way of reducing the use of fuel.
Standby Mode에서 Control Transistor 삽입을 이용한 CMOS Logic Circuits의 Leakage 감소기술
김지웅(Ji-Woong Kim),이동범(Dong-Bum Lee),이성철(Sungchul Lee),신현철(Hyunchul Shin) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
Due to increased integration density and reduced threshold voltages, leakage current reduction becomes important in the CMOS design for low power consumption. In a CMOS combinational logic circuit, the leakage current in the standby state depends on the state of the inputs and the number of stacked off transistors. In this paper we present new control transistor insertion algorithm for minimal leakage power. This algorithm efficiently finds the gates for replacement and it reduces leakage current 51.72% on the average for IBM 0.18㎛ processing technology. This algorithm has proven to be very useful in reducing leakage currents in standby mode of operation.