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Caffeine이 지구성 운동 수행능력에 미치는 영향과 억제성 아미노산에 의하여 활성화되는 이온통로의 조절작용
김은경,김영표,천병옥,이계영,김연정,임백빈,조영욱,김창주,김성수 대한스포츠의학회 1999 대한스포츠의학회지 Vol.17 No.1
To investigate the effect and mechanism of caffeine on endurance exercise, two experiments were performed. First, to test caffeine effect on aerobic exercise, 200-300g Sprague-Dawley rats were used and three groups, control group, low caffeine injection group and high caffeine injection group, were divided. Blood smpling by heart puncture were done at rest, after 30 min treadmill exercise, and after maximal exercise. Blood glucose, free fatty acid concentration were detected and following results were obtained. Glucose concentration showed significant difference between groups(p=0.0305) and also significant changes were exhibited between time(p=0.0004). Free fatty acid concentration had no difference between groups. but had significance between times(p=0.00065). Exercise endurance performance time showed significant difference(p=0.02350 in high caffeine injection group compared to control group. In this experiments, endurance exercise capacity was increased by caffeine injection. Therefore, second experiment was performed to investigate the effect of caffeine on ion current induced inhibitory amino acid neurotransmitter. GABA and glycine. Single periaqueductal gray neuron was acutely dissociated and nystatin perforated patch clamp was performed under voltage clamping condition. Caffeine evoked outward current in PAG neuron dose dependent manner. 1mM of caffeine application had no response. but 3mM caffeine evoked about 32.5±8.539pA outward ion current and 10mM caffeine evoked about 215.46±19.4pA outward current. 10^-2mM GABA activated Cl ̄current and recorded by inward current. Caffeine inhibited GABA activated Cl ̄ current concentration dependent manner. 10^-2mM of caffeine had no effect on 1-^-2mM of GABA response. but 10^-1mM caffeine inhibited GABA activated Cl ̄ current about 5.74±2.13%, 1mM caffeine inhibited about 17.25±2.70%, 10mM caffeine inhibited GABA response about 45.31±7.71%. 10^-1mM of glycine activated Cl ̄ current and also recorded by inward current. Caffeine inhibited glycine activated Cl ̄ current concentration dependent manner. 10^-2mM caffeine decreased glycine activated Cl ̄ current about 4.61±1.650%, 10^-1mM caffeine decreased about 6.49±2.24%, 1mM caffeine decreased about 26.82±4.27%, and 10mM caffeine decreased glycine response about 94.47±1.39%. These results suggest that caffeine inhibite inhibitory amino acid, GABA and glycine, this response causes excitation of CNS and this seems to be the basic mechanism of increasing effect to aerobic exercise performance by caffeine.
정종헌,원휘준,최왕규,김계남,이성호,오원진 한국공업화학회 2003 응용화학 Vol.7 No.1
Liquid wastes containing uranium ions in high concentration of chemical salts havebeen treated by electrosorption on a activated carbon fibers(ACFs) electrode. Effectiveuranium (VI) removal is accomplished when the potential is -0.5V(vs. Ag/AgCl) ormore negative. For a feed concentration of 100mg/1, the concentration of U(VI) in thecell effluent is reduced to less than 1mg/1, and electrosorption capacity over 500mg/uranium/gACF is reached. The adsorbed uranium can be desorbed up to 99%for 20h by passing a 1.9N NaCl solution at pH 3 through the cell and applying a potential of +1.2V. The amount of desorbed uranium increased as the solution pHwas lowered and the applied potential increased.
강계원,김대연,이영훈,강봉석,박정현,최병호 금오공과대학교 산업기술개발연구원 2000 産業技術開發硏究 Vol.16 No.-
AC powder electroluminescence(EL) device consists of seven layers : PET substrate, transparent electrode, phosphor layer, dielectric layer, two layer metal electrodes and protective layer. Etch layer needs to control to improve electrical and optical properties. Both phosphor and dielectric layer among them is more important to increase its properties. For long-time reliability, proper choices of passivation and sealing material are essential. In this paper, influence of phosphor and dielectric layer thickness on EL performance is studied. Type of cellulos is selected as a sealing material to avoid moisture. To add two type of plasticizer to resin improves flexibility and passivation of EL devices. Through this experiments, technologies of fabrication low-cost thick film EL device can be established.
비페닐 디메틸 디카르복실레이트(DDB)의 용출향상을 위한 고체분산체의 제조 및 평가
이정우,김정수,이계원,지웅길 忠南大學校 生命科學硏究院 醫藥品開發硏究所 2006 藥學論文集 Vol.21 No.-
Biphenyl dimethyl dicarboxylate(DDB) is synthetic compound derived from Schizandrin C, a component of Fructus Schizandrae. DDB is currently employed as an agent against virally induced hepatic injury and has been found to be effective in improving liver function and symptoms of patients with chronic viral hepatitis. But, DDB is practically water-insoluble and its dissolution rate is extremely low, resulting in very low bioavailability(20-30%). To improve the dissolution rate of DDB, solid dispersion particles of DDB were prepared with two different types of hydrophilic polymers such as Eudragit E100, hydroxypropylmethylcellulose(HPMC) by spray drying method. Properties of solid dispersions were characterized by DSC and PXRD. DDB tablets were prepared by compressing the powder mixtures composed of raw DDB, solid dispersions, lactose and Avicel PH102, magnesium stearate. At ratio above 1:3(w/w), DDB was amorphous state within DDB-Eudragit E100 solid dispersion. As the weight ratio of Eudragit E100 to DDB was increased, the dissolution rate of DDB-Eudragit E100 solid dispersion tablets was reached 69.37-98.29% after 30min. But, it rapidly decreased to 28.34-45.98% after 2hour due to precipitation of DDB. However, in case of 1:3:1 DDB-Eudragit E100-HPMC solid dispersion tablet containing HPMC, dissolution rate was reached 97.47% after 2hour without decrease of dissolution rate. From overall findings, DDB formulation containing Eudargit E100 and HPMC solid dispersion could be used to remarkably improve the dissolution rate in dosage form of tablets.
위상배열 초음파를 이용한 터빈 블레이드 루트부내 결함평가 기법 연구
조용상,정계조,박상기,김재훈 한국비파괴검사학회 2004 한국비파괴검사학회지 Vol.24 No.2
초음파검사는 재료의 표면 또는 내부에 존재하는 불 연속부를 검출하기 위해, 초음파를 재료에 전달시켜 검사하는 비파괴검사법의 일종이다. 이러한 일반 초음파검사 방법 및 일반 결함평가 방법은 복잡한 현상에서 반사되는 신호로부터 결함을 구분하기가 어려워 결함의 평가 및 검사결과에 신뢰성이 떨어지고 있는 실정이다. 따라서 이러한 crack성 결함의 발생 가능성이 높으나 기존의 초음파검사 방법으로는 결함 판별에 어려움이 있는 설비에서의 검사방법 및 결함평가 방법의 제고가 필수 불가결한 실정이다. 본 연구에서는 위상배열 초음파를 사용하여 크랙 검출능력이 높고 길이 평가가 가장 정확한 방사각도를 규명하고, 주요발전설비중 하나인 터빈에 적용하였다. 기존의 초음파 검사 방식이 아닌 위상배열 초음파를 이용하여 결함의 크기를 평가할 수 있는 신 기법 및 이를 이용하여 터빈 블레이드 루트부 내에 존재하는 미세 결함에 대하여 크기평가 방법 및 결함탐지 방법에 대하여 고찰하였다. Ultrasonic testing is a kind of nondestructive test to detect a crack or discontinuity in materials or on material surfaces by sending ultrasound to it. This conventional ultrasonic technique has some limitations in reliably detecting crack or accurately assessing materials in the case of complex-shaped power plant components such as a turbine blade root. An alternative method for such a difficult inspection is highly needed. In this study, application of a phased array ultrasonic testing (UT) system to a turbine blade, one of the critical power plant components, has been considered, and the particular incident angle has been determined so that the greatest crack detectability and the most accurate crack length evaluation may be achieved. The response of ultrasonic phased array was also analyzed to establish a special method to determine the crack length without moving the transducer. The result showed that the developed method for crack length assessment is a more accurate and effective method, compared with the conventional method.
최민호,이계복,조규원,박진영,김경수,송정석,한종현 한국전통의학연구소 2003 한국전통의학지 Vol.13 No.1
The purpose of this study is to measure the changes of regional cerebral blood flow (rCBF) and blood pressure (BP) of Cortex Acanthopanacis in rats, and to determine the effect of Cortex Acanthopanacis on phenylephrine (PE) induced contraction of isolated rat thoracic aorts. The measurement was continually monitored by laser-doppler flowmeter (Transonic Instrument, USA) and pressure transducer (Grass, USA) in anesthetized adult Sprague-Dawley rats through the data acquisition system composed of MacLab and Macintosh computer. Contractile force was measured with force displacement transducer under 1.5 g loading tension. The result of this experiment was as following; 1. Cortex Acanthopanacis did not effect the changes of rCBF and blood pressure significantly. 2. Contractions evoked by phenylephrine were decreased significantly by Cortex Acanthopanacis 3. L-NNA, ODQ, atropine and indomethacin significantly altered the relaxation of Cortex Acanthopanacis. 4. Propranolol did not change the relaxation of Cortex Acanthopanacis. These results indicate that Cortex Acanthopanacis did not change the rCBF and BP, but Cortex Acanthopanacis can relax PE induced contraction of isolated rat thoracic aorta and that this increasing contraction related to endothelium and various mechanism.
IoT를 적용한 알람 램프 및 스피커 모듈 제작에 관한 연구
황계호(Gye-Ho Hwang),김정현(Jung-Hyun Kim),김형준(Hyung-Jun Kim),박지환(Ji-Hwan Park),문원식(Won-Sik Moon),김홍용(Hong-Yong Kim),김경신(Kyoung-Shin Kim),김은영(Eun-Young Kim),김윤(Youn Kim),이봉섭(Bong-Seob Lee) 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
This paper focuses on user convenience, safety, and security to remotely notify an alarm with sound(auditory) and light(visual) for the alarm function when indoor/outdoor help is needed for the visually impaired, deaf, and children. proposed, designed, and manufactured a circuit configuration with a remote control function added without temporal and spatial restriction, and confirmed its applicability. In the future, children and the visually/hearing-impaired will also test whether the proposed device can be controlled remotely.