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Guoning Wang,Xiong Du,Ying Shi,Heng-Ming Tai,Yongliang Ji 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.3
Frequency coupling in the phase domain is a recently reported phenomenon for phase locked loop (PLL) based three-phase grid-inverter systems. This paper investigates the mechanism and stabilization method for the frequency coupling to the stability of grid-inverter systems. Self and accompanying admittance models are employed to represent the frequency coupling characteristics of the inverter, and a small signal equivalent circuit of a grid-inverter system is set up to reveal the mechanism of the frequency coupling to the system stability. The analysis reveals that the equivalent inverter admittance is changed due to the frequency coupling of the inverter, and the system stability is affected. In the end, retuning the bandwidth of the phase locked loop is presented to stabilize the three-phase grid-inverter system. Experimental results are given to verify the analysis and the stabilization scheme.
Comparative Study of Zhu Xi and Wang Fu-zhi on the theories of Mind, Nature, Feeling, and Ability
Guon, Ji-yong 성균관대학교 동아시아학술원 2001 Sungkyun Journal of East Asian Studies Vol.1 No.1
Comparative Study of Zhu Xi and Wang Fu-zhi on the theories of Mind, Nature, Feeling, and Ability
[10]-Gingerol Induces Intrinsic Apoptosis in A2058 Human Melanoma Cells
Guon, Tae Eun,Chung, Ha Sook The Korean Society of Food and Nutrition 2022 韓國食品營養學會誌 Vol.35 No.3
The objective of the present study was to investigate the molecular mechanisms involved in the activity of [10]-gingerol using A2058 human melanoma cells. [10]-Gingerol inhibited the proliferation of A2058 cells by 50% at a concentration of 52 μM. Such inhibition was dose-dependent accompanied by morphological change indicative of apoptosis. Furthermore, flow cytometric analysis by Annexin V and PI double staining showed that [10]-gingerol increased the extent of apoptosis. Analysis of the mechanism of these events indicated that [10]-gingerol increased the ratio of Bax to Bcl-2, resulting in the activation of caspase-9, caspase-3, and poly-ADP-ribose polymerase in a dose-dependent manner.
Wang, Guoning,Du, Xiong,Shi, Ying,Tai, Heng-Ming,Ji, Yongliang The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.3
Frequency coupling in the phase domain is a recently reported phenomenon for phase locked loop (PLL) based three-phase grid-inverter systems. This paper investigates the mechanism and stabilization method for the frequency coupling to the stability of grid-inverter systems. Self and accompanying admittance models are employed to represent the frequency coupling characteristics of the inverter, and a small signal equivalent circuit of a grid-inverter system is set up to reveal the mechanism of the frequency coupling to the system stability. The analysis reveals that the equivalent inverter admittance is changed due to the frequency coupling of the inverter, and the system stability is affected. In the end, retuning the bandwidth of the phase locked loop is presented to stabilize the three-phase grid-inverter system. Experimental results are given to verify the analysis and the stabilization scheme.
지방정부의 경제적 규제에 대한 규제당사자 간의 의식비교 ; 대구 경북지역을 중심으로
신희권 (Hee Guon Shin) 한국정책학회 1996 韓國政策學會報 Vol.5 No.2
지방자치가 본격화됨에 따라 지방정부는 지역경제의 독자적인 주체로 등장하게 되고, 경제적 규제와 관련하여서도 정책결정과 집행을 독자적으로 담당하게 된다. 이렇게 지방정부에 주어진 경제적 규제기능이 어떻게 수행되느냐에 따라 해당 지역경제의 사활이 좌우되므로 지방정부의 경제적 규제에 대해 연구할 필요가 학문적으로 또 실천적으로 존재한다. 이에 이 논문은 시론적인 차원에서 지방화시대와 지방정부의 경제적 규제에 대하여 규제를 담당하고 있는 지방공무원들과 피규제자인 지역기업인들이 어떻게 생각하고 있는지에 대하여 설문조사를 통해 비교·분석하고 있다. 의식 비교의 결과를 종합하면 지방화시대에 따른 중앙-지방정부 간의 실질적 규제권의 재배분 문제와 지방정부의 경제적 규제의 개편방향 등에 대해서는 지방공무원집단과 지역기업인집단 간에 의식의 차이가 거의 없다는 것을 알 수 있다. 그러나 경제적 규제와 관련하여 지방공무원이 가장 중시하는 이해와 경제적 규제와 관련한 지방공무원·해당사업자의 영향력 크기, 자율규제에 따른 규제의 감소 가능성 등과 같이 의식의 차이가 나고 있는 부분도 많은 바 이로부터 지방공무원들은 스스로 규제의 공익모형에 입각하여 경제적 규제를 실시하고 있다고 생각하는 데 비해서 지역기업인들은 지방정부의 경제적 규제가 공공선택모형 또는 지대추구모형에서 주장하는 내용과 부합한다고 생각하고 있다는 것을 알 수 있다.
Tae Eun Guon,정하숙 한국식품영양학회 2022 韓國食品營養學會誌 Vol.35 No.6
The present study was designed to investigate the antiproliferative activity and molecular mechanisms of Bibimbap in HT-29 human colorectal adenocarcinoma cells. Bibimbap extract inhibited the proliferation of HT-29 cells by 50% at a concentration of 10.1±0.17 mg/mL for 48 h. The population of live cells decreased slightly, and the morphology changed with a reduction in cell volume (pyknosis) with Bibimbap. Treatment with 5 mg/mL of Bibimbap resulted in slight cell shrinkage. Furthermore, as the Bibimbap dose increased to 10 mg/mL, these characteristics were more evident, and HT-29 cells exhibited partial detachment by staining with the DNA-binding dye Hoechst 33342. Flow cytometric analysis by Annexin V and PI double staining showed that Bibimbap increased the levels of apoptosis. Analysis of the mechanism of these events showed that Bibimbap-treated cells exhibited a mitochondria-dependent apoptotic pathway through the modulation of caspase-3, caspase-8, caspase-9, and poly-ADP ribose polymerase, as well as Bax and Bcl-2 expression in dose- and time-dependent manners. Consequently, Bibimbap exerts a significant antiproliferative effect on HT-29 human colorectal adenocarcinoma cells. Key words: Bibimbap, antiproliferation, HT-29, human colorectal adenocarcinoma cells, mitochondrial apoptosis, Korean dish