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김춘옥(Choon-Ok Kim),이지원(Ji-Won Lee),임지애(Jee-Aee Im),강희철(Hee-Chul Kang),이승범(Seung-Bum Lee),서상훈(Sang-Hun Suh),이덕철(Duk-Chul Lee) 대한임상노인의학회 2008 대한임상노인의학회지 Vol.9 No.4
연구배경: 치매에 대한 조기 증상으로 걸음걸이 속도가 인지기능 저하와 연관성이 있다는 연구들이 있지만 아직 한국 노인을 대상으로 시행한 연구는 없었다. 이에 본 연구는 한국 노인을 대상으로 치매의 선행증상 중 하나인 걸음걸이 속도와 인지기능간의 연관성을 살펴보고자 한다. 방법: 지역사회에 거주하는 거동 및 일상생활이 가능한 60세 이상의 노인들 중 인지기능에 영향을 줄 수 있는 병력을 가지고 있는 경우는 연구대상에서 제외시켜 총 126명의 노인을 대상으로 시행하였다. 기본 문진과 혈액검사 및 우울은 Beck Depression Inventory (BDI), 인지기능은 KMMSE를 이용하여 측정하였다. 걸음걸이 속도는 6 m의 직선거리를 걸을 때 걸리는 시간을 측정하여 m/s로 계산하였다. 결과: 대상자를 정상 인지기능군(KMMSE score>24, n=107)과 인지기능 저하군(KMMSE≤24, n=19)으로 나누었을 때 통계적으로 유의하지 않지만 인지기능 저하군에서 걸음걸이 속도가 정상군에 비해 느리게 나타났다(P=0.620). 인지기능과 걸음걸이 속도에 대한 상관분석 결과 양의 상관관계를 보였고 (r=0.204, P=0.022) 다른 혼란변수를 통제한 후 다중회귀분석을 시행하였을 때 걸음걸이 속도만이 KMMSE와 독립적인 연관성이 있는 것으로 나타났다(β=0.207, P=0.021). 결론: 다른 혼란변수를 보정한 후에도 걸음걸이 속도만이 인지기능과 독립적인 연관성이 있음을 나타내었다. 즉, 걸음걸이 속도가 느릴수록 인지기능 저하가 나타남을 알 수 있었다. Background: There is some evidence that gait abnormality precedes the diagnosis of dementia but it is not clarified that gait speed is associated with cognitive function in healthy elderly. Methods: A total of 126 community dwelling healthy old people were recruited in this study. We measured blood pressure, weight and height, as well as drug history and behavioral habits. Beck Depression Inventory and Korean version of Mini Mental State Examination (KMMSE) were used for the assessment of depression and cognitive function. Usual gait speed (m/s) over 6 m was measured. Results: There was no difference in gait speed between normal (KMMSE score>24) and cognitive impaired group (KMMSE score≤24), divided by MMSE score. However, in Pearson correlation analysis, gait speed was positively associated with KMMSE score (r=0.204, P=0.022). After adjustment of confounders, gait speed contributed independently to KMMSE score by multiple linear regression analysis (β=0.207, P=0.021). Conclusion: Gait speed was independently associated with cognitive function. That is, slow gait speed could predict cognitive dysfunction.
서임춘,김동일,예병한,정발,박종욱,Suh, Im-Choon,Kim, Dong-Il,Yeh, Byung-Hahn,Jung, Bahl,Park, Chong-Ook 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.8
To increase the anti-oxidation and anti-wear properties of graphite for the propellant-burning environment, SiC, Pt and Al2O3 multi-layer coatings were conducted succesisvely and the optimum condition was researched. The SiC layer was produced by pack cementation and SiC layer in thickness of 30 ${\mu}{\textrm}{m}$ coating was produced after coating for 6 hours. Pt layer was coated by sputtering, and the Al2O3 layer was coated by reactive sputtering. the thickness of Pt layer and Al2O3 layer was less than one-tenth of that of SiC layer. The pack coated specimens and multi-layer coated specimens were made using above conditions and test-fired. The test result showed that the wear rate of SiC layer is approximately 1/10 compared to that of uncoated graphite.
미세 발열체의 발열특성과 열처리 온도에 따른 Pt/Cr 이중층의 특성
이승환,서임춘,성영권 ( Seung Hwan Yi,Im Choon Suh,Yong kwon Sung ) 한국센서학회 1996 센서학회지 Vol.5 No.5
In this paper, we fabricated the micro hotplate which consisted of a thin film heater(Pt/Cr bilayers) sandwiched with the thermal oxide and E-beam evaporated oxide. And we studied the electrical and the structural properties of Pt/Cr bilayers due to annealing temperature. When we compared the temperature measured from type k thermocouples with the temperature acquired from I.R. thermo-vision system according to the variations of emissivity, the emissivity of E-beam evaporated oxide was 0.5. The sheet resistance of Pt/Cr bilayers didn`t depend on the Cr layer thickness, and it was considered as the existence of CrO between the Pt and the Cr layer. When the annealing temperature was increased from 500℃ to 700℃, the out-diffusions of Cr were increased(which was confirmed by AES depth profile) and the grain size of Pt(220) phase was enlarged also(analyzed by XRD and SEM photographs). From the results of XRD analysis and AES depth profile, the Pt/Cr bilayers annealed at 500℃ were more stable than any other cases in structural properties.