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오존 처리된 TiO2 나노튜브 분말로 제조된 광양극의 염료감응형 태양전지 특성
천기영,박민우,성열문 경성대학교 공학기술연구소 2008 공학기술연구지 Vol.15 No.-
Membranes of TiO2 nanotube arrays were produced by potentiostatic anodic oxidation of 100㎛ thick Ti plate The anodization was performed under constant potential of 60V at ~22℃ for up to 96 hours Electrolyte used was an Ethylene Glycol(EG) solution with an addition of H2O (2.0 vol. %) and NH4F (0.3 wt.%) TiO2 nanotube arrays having lengths of ~200㎛ were grown in vertical direction to the Ti plate TiO2 nanotube membrane was grinded to produce fine particles of nanotubes TiO2 nanotube particles were treated with ozone to improve dye attachment A slurry made with the TiO2 nanotube particles was coated onto transparent conducting oxide(TCO) by doctor blade method to produce dye-sensitized solar cells(DSCs) Electrical properties of the DSC cells were haracterized.
은침점전기자극이 $Na^+$, $K^+$ 이온과 $Ca^{2+}$ 이온변동에 미치는 효과
천기영,김중환,김순희,민경옥,Chon, Ki-Young,Kim, Jung-Hwan,Kim, Soon-Hee,Min, Kyung-Ok 대한물리치료과학회 2003 대한물리치료과학회지 Vol.10 No.1
The present study examined that in vivo test is investigated in sham-operated(control group) and aldosterone-analogue deoxycorticosterone acetate (DOCA)-salt hypertensive animals(experimental group) and that the antihypertensive effect was induced by silver spike point(SSP) low frequency electrical stimulation at meridian points(CV-3, -4, Ki-12, SP-6, LR-3, BL-25, -28, -32, -52), specifically, such as diuretic action in 24 hour urine analysis from normal volunteer. The $Na^+$ and $Ca^{2+}$ ions were significantly increased in aldosterone-analogue DOCA-salt hypertensive rats than that in sham-operated rats. However, the $K^+$ ions were significantly decreased in aldosterone-analogue DOCA-salt hypertensive rats than that in sham-operated rats. The current of 1 Hz continue type of SSP low frequency electrical stimulation significantly increased in excretion of urine $Na^+$ and $K^+$ ions from normal volunteer. However, the excretion of $Ca^{2+}$ ion were significantly decreased by SSP electrical stimulation in volunteer. These results suggest that the development of aldosterone analogue-DOCA-salt hypertension is associated with changed $Na^+$, $K^+$ and $Ca^{2+}$ ions of urine. which directly affects blood pressure. Therefore, the hypertension is a risk factor on cardiovascular disease. Moreover, These results demonstrate that the SSP low frequency electrical stimulation, especially current of 1 Hz continue type, significantly regulates $Na^+$, $Ca^{2+}$ and $K^+$ ions from volunteer. Therefore, the SSP low frequency electrical stimulation is a good regulator through a diuretic action of aldosterone-induced hypertension.
은침점전기자극의 인체적용이 신사구체여과율(Glomerular Filtration Rate)에 미치는 효과
천기영,김순희,민경옥,최영덕,이준희,김중환,Chon, Ki-Young,Kim, Soon-Hee,Min, Kyung-Ok,Choi, Young-Duk,Lee, Joon-Hee,Kim, Jung-Hwan 대한물리치료과학회 2004 대한물리치료과학회지 Vol.11 No.1
The purpose of the present study was to investigate the effectiveness of silver spike point (SSP) low frequency electrical stimulation on glomerular filtration rate (GFR), specifically, such as diuretic action in 24 hour urine and in plasma analysis from normal volunteer. The current of 1 Hz continue type (CT) of SSP low frequency electrical stimulation significantly decreased in plasma creatine from normal volunteer. However, the urine creatinine clearance (Ccr) was significantly increased by SSP low frequency electrical stimulation in normal volunteer. These results suggest that the SSP low frequency electrical stimulation, especially current of 1 Hz continue type, significantly regulates urine creatinine clearance and glomerular filtration rate from normal volunteer. Therefore, the SSP low frequency electrical stimulation is a good regulator through a diuretic action of hypertension.
Aldosterone 유도체-고혈압의 음성적 유해와 은침점전기자극의 aldosterone 억제
천기영,김중환,김순희,민경옥,Chon, Ki-Young,Kim, Jung-Hwan,Kim, Soon-Hee,Min, Kyung-Ok 대한물리치료과학회 2003 대한물리치료과학회지 Vol.10 No.2
The present study examined that in vivo/vitro test is investigated in normotensive sham-operated rats(NSR) and aldosterone-analogue deoxycorticosterone acetate (DOCA)-salt hypertensive rats(ADHR) and that the antiliypertensive effect was induced by silver spike point(SSP) electrical stimulation at meridian points(CV-3, -4, Ki-12, SP-6, LR-3, BL-25, -28, -32, -52), specifically, such as aldosterone in 24 hour urine analysis from normal volunteer. The heart weight, the tickness of vascular wall, collagen fiber and the systolic blood pressure were significantly increased in ADHR than that in NSR. The required time of PSS-induced resting tone and the phosphorylation of stress-activated protein kinase/c-Jun N-terminal protein kinase(SAPK/JNK) were significantly increased in ADHR than that in NSR. However, the Kv currents were significantly decreased in ADHR than that in NSR. The current of 1 Hz continue type of SSP electrical stimulation significantly decreased in excretion of urine aldosterone from normal volunteer. These results suggest that the development of aldosterone analogue-induced hypertension is associated with changed heart weight, content of collagen fiber, tickness of vascular wall, blood pressure, resting tone, voltage-dependent K+ current(Kv) and phosphorylation of SAPK/JNK, which directly affects blood pressure. Therefore the hypertension is a risk factor on cerebrovascular disease. Moreover, These results suggest that the SSP electrical stimulation, especially current of 1 Hz continue type, significantly regulates excretion of urine aldosterone from volunteer.
일기예보정보를 활용한 독립형 태양광 발전 시스템의 발전량 단기 예측
천기영(Gi-young Chun),한용(Yong Han),송성윤(Sung-yoon Song),박종후(Joung-hu Park) 대한전기학회 2014 대한전기학회 학술대회 논문집 Vol.2014 No.4
독립형 태양광 발전 시스템은 부하에 안정적으로 전력을 공급하는 것이 가장 중요시 되며, 이를 위해서는 태양광 발전 시스템의 발전량 예측이 필수적이다. 발전량 예측을 위해 일사량을 예측하였으며, 일사량은 운량 예측을 통해 구하였다. 운량은 과거 기상자료와 일기예보를 이용하여 예측하였다.
인체에 적용한 전기자극이 Serum myoglobin과 Aldolase에 미치는 영향에 대한 생리학적 효과
김순희,천기영,최영덕,Kim, Soon-Hee,Chon, Ki-Young,Choi, Young-Deok 대한물리치료과학회 1999 대한물리치료과학회지 Vol.6 No.3
Prior studies have revealed that several stimulation to the muscle have released serum myoglobin into the blood vessel and increased aldolase activity. The present authors carried out a study which effect of electrical stimulation treatment (induced a isotonic wrist exerceise) on serum myoglobin(Mb) levels and aldolase(Al) activity were investigated in 6 healthy female. There were four groups of female: 1. no electrical stimulation control: 2. electrical stimulation 10min (EST10'); 3. electrical stimulation 20 min (EST20'); 4. electrical stimulation 30min (EST30'). Each groups is all the same one. Radioimmunoassay and Ultraviolet Spectrophotometry were performed to increased or decreased of serum myoglobin and aldolase. Serum myoglobin significantly increased in electrical stimulated groups[EST10' $(30.20{\pm}5.27ng/ml)$, EST20'$(31.65{\pm}3.96ng/ml)$, EST30'$(31.95{\pm}2.0ng/ml)$] to be compared with control group$(24.43{\pm}2.20ng/ml)$. Aldolase significantly increased in electrical stimulated groups [EST10' ($6.85{\pm}1.17$ Sigma U/mL), EST20'($6.70{\pm}1.46$ Sigma U/mL), EST30'($6.56{\pm}1.01$ Sigma U/mL)) to be compared with control group($5.03{\pm}1.86$ Sigma U/mL). The results of this study show that isotonic exercise result in electrical stimulation treatment increased serum myoglobin content and aldolase activity. In conclusion, our results support that stimulation release serum myoglobin and increase aldolase activity.
세포 내 $Ca^{2+}$-의존성/-비의존성 평활근 수축기전에 대한 액틴결합단백질-Caldesmon-의 역할 - 노인성 심혈관질환 관련 노인물리치료 연구를 위한 기초의학적 접근 -
김중환,민경옥,최영덕,이준희,천기영,Kim, Jung-Hwan,Min, Kyung-Ok,Choi, Young-Duk,Lee, Joon-Hee,Chon, Ki-Young 대한물리치료과학회 2004 대한물리치료과학회지 Vol.11 No.1
It is widely accepted that smooth muscle contraction is triggered by intracellular $Ca^{2+}$ ($[Ca^{2+}]_i$) released from intracellular $Ca^{2+}$ stores such as sarcoplasmic reticulum (SR) and from the extracellular space, The increased $[Ca^{2+}]_i$ can phosphorylate the 20-kDa myosin light chain ($MLC_{20}$) by activating MLC kinase (MLCK), and this initiates smooth muscle contraction. In addition to the $[Ca^{2+}]_i$-MLCK-tension pathway, a number of intracellular signal molecules, including mitogen-activated protein kinase (MAPK), protein kinase C (PKC), phosphatidylinositol 3-kinase (PI3K), and Rho-associated coiled coil-forming protein kinase (ROCK), play important roles in the regulation of smooth muscle contraction. However, the mechanisms regulating contraction of caldesmon (CaD), actin-binding protein, are not entirely elucidated in the presence of $Ca^{2+}$. It is known that CaD tightly interacts with actin and inhibits actomyosin ATPase activity. Therefore, the purpose of the present study was to investigate the roles of $Ca^{2+}$-dependent CaD in smooth muscle contraction. Endothelin-1 (ET-1), G-protein coupled receptor agonist and vasoconstrictor, increased both vascular smooth contraction and phosphorylation of CaD in the presence of $Ca^{2+}$. These results suggest that ET-1 induces contraction and phosphorylation of CaD in rat aortic smooth muscle, which may he mediated by the increase of $[Ca^{2+}]_i$.