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.

서비스업에서의 임파워먼트가 서비스 품질성과에 미치는 영향에 관한 연구

김계수 한국품질경영학회 2000 품질혁신 Vol.1 No.1

In some ways service companies have more to gain from empowerment than manufacturing organizations. For most, the only way to create a competitive edge is through their people and the quality of service can provide. Meaning of the Empowerment is a leader's sharing of influence and control with followers. In fact, Service organizations have both more to gain and more to lose from empowerment than manufacturing organizations. Empowerment in service organizations has certainly generated more publicity than on the factory floor. Service workers encounter customer in real time or moment of truth. Many Company have introduced empowerment as part of their corporatewide efforts in implementing total quality management. Questionnaire was developed, and data was collected and analyzed for this study. Conclusively, Leadership, Customer's Involvement are the important drivers among empowerment degree. Empowerment is significantly related to employee's satisfaction, Job satisfaction, and Improvement. Job satisfaction is significantly influence on customer satisfaction in service sector.

e-supply chain management system 구축 전략의 실행방안에 관한 연구 : 제조업을 중심으로

김계수 한국품질경영학회 2003 품질경영학회지 Vol.31 No.2

The objective in this paper is to develope the e-Supply Chain Management System and applied for the Manufacturing. A Manufacturing that is consider to be world class recognize that its ability to complete in the marketplace depends on developing e-SCM System that is properly align with its mission of serving the customer. This paper investigated the relationship between e-SCM and performance in manufacturing. A stratified random sample was collected from the Federation of Korea Industries. Conclusively, e-SCM is important factor between source factors (environmental dynamic, Leadership) and manufacturing performance. e-SCM is significantly related to Quality, Flexibility, Delivery, and Cost.

공공부문에서 MB모형을 이용한 품질경영 인과모형의 구축에 관한 탐색적인 연구 : 자치행정부문을 중심으로 Focused on Autonomy Administration

김계수 한국경영과학회 2002 한국경영과학회지 Vol.27 No.3

In this paper, I investigate the impact of quality management activities on the public sector within the framework of Malcolm Baldrige (MB) national quality model. The Structural Equation Modeling approach has been employed to investigate the cross influences among the seven MB categories. This empirical study shows that a number of statistical hypotheses are significant. The Leadership category is the most important driver among the quality management activities. This, in turn, implies that the main source in quality management is to foster a solid quality oriented leadership system. Categories such as information Analysis, Strategic Planning, Human Resource Development and Management, and Process Management are significantly related to the Customer Satisfaction category. In addition, Leadership, Information Analysis, and Customer Satisfaction categories are significantly influential to Management Performance.

운동형태가 골밀도에 미치는 영향

이계영,김성수 대한스포츠의학회 1995 대한스포츠의학회지 Vol.13 No.1

The objective of present study was evaluate the influence of physical activity on bone mineral density in young men. Included in the study were 21 athletes who participated in a full-scale physical exercise program. The control group consisted of 7 healthy men of the same age distribution. The athletes were classified into three categories; baseball players, gymnastic players, swimmers. On the basis of the results of Dual Energy X-ray Absorptiometry, bone mineral content of each body region, total bone calcium content and bone mineral density were analyzed. The results statistically analyzed on these data were summarized as follows; 1. Arms and spine ribs bone mineral density in gymnastic players were significantly higher that in baseball players, swimmers and non-athletes. 2. Legs and pelvis bone mineral density in baseball players were significantly higher than in non-athletes. 3. Lumbar and total bone mineral density in gymnastic players, baseballplayers were significantly higher that in non-athletes. 4. Legs, ribs, pelvis, spine, lumbar and total bone mineral density in swimmers showed no significant difference from non-athletes.

이트라코나졸 경구제제의 제제설계 및 평가

장혜진,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.-

We prepared oral formulations of itraconazole by hot-melt process to increase dissolution rate of this drug. Oral liquid preparations of drug were prepared by melt method with lactic acid and blended with co-solvent, antioxidant and surfactant. Glycofurol and isopropyl alcohol were used as co-solvents, and ascorbic acid and as-corbyl palmitate were used as antioxidants, and TPGS and Gelucire 44/14 were used as surfactants. The final preparations contained 10% of itracnoazole as drug content percentage. The dissolution profiles of itraconazole from liquid preparation were determined at 37±0.5℃ at a stirring rate of 100 rpm using the paddle method. The oral absorption of itraconazole liquid preparation was studied in the rabbits. Major pharmacokinetic parameters (AUC_(0-48hr), C_(max), T_(max)) were calculated from the plasma concentration-time data. The dissolution rate of itraconazole was higher for itraconazole liquid preparation filled into a hard gelatin capsule with 90% release within 20min as compared to 20% for Sporanox capsules. Both the AUC_(0-48hr) and C_(max) values of liquid formulation prepared with isopropyl alcohol were higher than those of itraconazole prepared with glycofurol. The dissolution rate of itraconazole liquid preparation was higher as compared to Sporanox capsules. The bioavailability of drug prepared with isopropanol were higher than those of drug prepared with glycofurol.

염산 메트폴민을 함유하는 경구방출제어형 제제의 제조 및 용출특성

구본철,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.-

Metformin is an antihyperglycemic agent of the biguanide class used in the treatment of non-in-sulin-dependent diabetes mellitus. Metformin hydrochloride has intrinsically poor permeability in the lower portion of the GI-tract leading to absorption almost exclusively in the upper part of the GI-tract. Its oral bioavailability is in the range of 50 to 60%. It also has a very high water solubility. In this study, we prepared sustained release matrix system containing metformin hydrochloride using various characteristics of polyethylene oxide (PEO). The metformin hydrochloride matrix tablets were prepared by direct compressed method and wet granulation compressed method with various molecular weight of PEO. Even though the molecular weights of PEOs used were 900K, 2,000K, and 5,000K. Moreover, three types of matrix tablets were formulated compositions were same, the hardness was different. The release kinetics were studied for 9 hours in pH 1.2 simulated gastric fluid and pH 6.8 simulated intestinal fluid, using a dissolution tester at 37.5℃, 50 rpm. As the molecular weight of PEO increased, the release rate decreased due to the slower swelling and dissolution of PEO. For the effect of hardness of matrix tablets, the rate of drug release was decreased with increasing hardness.

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.

막-생물반응조 공정을 이용한 염색폐수의 처리

강민수,김성수,황규대,강종림 慶熙大學校 材料科學技術硏究所 1997 材料科學技術硏究論集 Vol.10 No.-

혐기-호기 생물반응조 공정과 막분리 공정을 조합한 막-생물반응조 공정을 이용하여 염색폐수 중의 난분해성 물질들을 제거하였다. 염색폐수 원수를 직접 막분리공정에 적용한 결과 심각한 fouling을 초래하였다. 반면 생물반응조로 1차 처리한 후 막분리공정에 적용한 경우 생물반응조가 막의 오염원을 상당부분 제거하여 fouling현상이 현저히 감소하였으며, 막의 수명도 연장시킬 수 있었다. 염색폐수의 처리효율 및 fouling현상은 막의 기공 크기나 구조보다는 막의 재질에 더욱 의존함을 확인하였다. 중공사막 module의 사용 방법 및 중공사막 내부의 유속에 따라서 제거효율 및 투과유량이 변화하였다 생물반응조나 막분리 단독공정보다 두공정을 조합한 공정이 보다 효과적으로 염색폐수 처리능력을 보였다. Membrane-bioreactor process which combines anaerobic-aerobic bioreactor and membrane process, was used to remove refractory organic susbstances and dye molecule in textile wastewater effectively. Direct feeding of raw feed water to membrane process caused serious fouling on membrane. On the other hand, pretreated feed by bioreactor before the membrane process remarkably reduced the fouling and prolonged the membrane life. Removal efficiency and fouling were more dependent on the material property of the membrane rather than the membrane pore size and structure. Operation mode of hollow fiber membrane module and linear velocity in the hollow fiber influenced the removal efficiency and the water flux of the membrane. The combined membrane-bioreactor process was more effective in treating the textile wastewater than each single process.

五加皮의 效能에 대한 硏究

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.