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PVD코팅에서 전기화학적 방법을 통한 정량적 기공율 측정에 관한 연구
김정구,안승호 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.2
The presence of porosity in the coatings can lead to the electrochemical dissolution of the substrate. Thus, the characterization of porosity in a quantitative manner is of great interest to researchers. Recent technological advances in porosity measurement using electrochemical methods have resulted in overcoming the traditional porosity measurement limitations. It is possible to establish the method of quantitative and reliable porosity measurement using electrochemical impedance spectroscopy. The accurate porosity measurement should be calculated from the initial immersion time to critical immersion time. The induction time to obtain the accurate porosity value was based on the correlation between the porosity enlarged ratio and the charge transfer resistance. The porosity values are summed up to the critical time, and then the total porosity values were divided by the number of measurements taken. (Received September 8, 2004)
김정구,이명수,김미예,전미나 Academy of Asian Business (AAB) 2023 Academy of Asian Business Review Vol.9 No.1
The content analysis of the Top 10 Winning Cases generated five key success factors in common: (1) identifying market opportunity by clearly understanding the demand of the current age and creating exceptional customer experiences, (2) achieving a Unique Brand Positioning (UBP), (3) build up the strong partnerships with suppliers and stakeholders, (4) prioritizing authenticity and social responsibility, and (5) focusing on unique local resources. The insights gleaned from the Top 10 winning cases presented in the book will be helpful in developing such an Asian perspective among businesspeople and even students with great ambition to conquer the world.
폐경 후 여성에서의 혈청 인슐린 유사 성장인자 결합 단백질들의 분포 양상과 골 밀도와의 연관성에 관한 연구
김정구,최영민,문신용,이진용 대한폐경학회 1996 대한폐경학회지 Vol.2 No.2
The objective of this study was to evaluate the relationship between serum insulin-like growth factor-binding proteins (IGFBPs) profiles and bone mineral density (BMD) measurements and biochemical makers of bone tumover in postmenopausal women. Sera from 37 normal healthy postmenopausal women and 14 postmenopausal women with osteoporosis were analyzed for IGFBPs and osteocalcin by western ligand blotting and radioimmunoassay, respectively. BMD measurements were performed by dual energy X-ray absorptiometry(DEXA). Urinary calcium and creatinine excretion were also determined. The data were analyzed statistically by analysis of variance and the least squares method. Serum IGFBP-2 ratio(IGFBP-2 intensity/total IGFBPs intensity) in postmenopausal women with osteoporosis was significantly higher(p$lt;0.02) than that in normai healthy postmenopausal women, but serum IGFBP-3 ratio(IGFBP-3 intensity/total IGFBPs intensity) in women with osteoporosis was significantly lower (p$lt;0.01). Serum IGFBP-2 ratio correlated negatively with BMD of lumbar spine(p$lt;0.0001 ), femoral neck(p$lt;0.05), trochanter(p$lt;0.01) and Ward's triangle(p$lt;0.05) but there was a significant positive correlation between serum IGFBP-3 ratio and BMD of lumbar spine(p$lt;0.001) and trochanter(p$lt;0.05). No corrdations between serum IGFBPs levels or serum IGFBPs ratios and biochemical markers of bone tumover were noted. Our data indicate that the measurement of serum IGFBP profiles might be useful in identifying postmenopausal women at risk for osteoporosis.