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척추 압박 골절의 임상 양상 및 노인 기능에 미치는 영향
박경채(Park Kyung Chae),김소림(Kim So Lim),강영곤(Kang Young Gon),신경균(Shin Kyung Kyun),김문종(Kim Moon Jong),이영진(Lee Young Jin),배철영(Bae Chul Young) 대한임상노인의학회 2002 대한임상노인의학회지 Vol.3 No.3
연구배경 : 척추 압박 골절은 노인에 있어 신체적, 정서적 활동 및 일상 생활에 제한을 가져올 수 있다. 국내에서는 아직까지 척추 압박 골절이 신체적, 정서적 활동 및 일상 생활에 어떠한 영향을 미치는지에 대한 연구는 아직까지 미흡한 실정이다. 이에 본 연구에서는 척추 압박 골절의 임상 양상과 노인 기능에 미치는 영향을 알아보고자 하였다. 연구방법 : 1995년 9월부터 1999년 6월까지 분당의 모 대학병원 가정의학과에 입원한 60세 이상의 환자들 중에서 과거 척추 압박 골절로 진단된 68명을 대상으로 척추 압박 골절의 부위와 골절수, 요통유무, 골대사율(골흡수율, 골생성율) 및 골밀도를 조사하였다. 신체 기능 평가를 위하여 일상 생활 동작 수행 능력(ADL)과 도구적 생활 동작 수행 능력(IADL) 및 노인 우울 척도(GDS)를 평가하였고, 척추 압박 골절과의 관계를 분석하였다. 결과 : 연구 대상군의 평균 연령은 74.16(±6.88)세였고, 68명중 여자가 62명(91.2%)이었다. 낙상의 병력이 있는 경우가 77.8%, 요통이 있는 경우는 71.2% 이었으며, 휠체어와 지팡이를 사용하는 경우가 각각 6.1%, 12.2%였다. 평균 척추 압박 골절수는 2.63(±0.29)개였으며 척추 압박 골절이 가장 많은 부위는 제1요추였으며 다음으로 많은 부위는 제 12 흉추였다. 척추 압박 골절수의 증가에 따라서 골밀도가 감소하였으나 통계학적 의의는 없었고(age adjusted, r= -0.179, p=0.239) 동통에 따른 척추 압박 골절 수의 유의한 차이를 보였으나(P<.01) 다발성 척추 압박 골절군(2개 이상)과 1개의 척추 압박 골절 군에 따른 일상 생활 동작 수행 능력, 도구적 생활 동작 수행 능력 및 우울 정도와의 차이는 없었다(P>.05). 결론 : 척추 압박 골절수에 따른 기능의 유의한 차이는 없었으나 동통에 따른 척추 압박 골절수의 유의한 차이를 보였다. 따라서 고위험군이나 이미 척추 압박 골절이 있는 대상자들에서 이에 대한 진단 및 예방을 위한 적극적인 노력이 필요함을 제시한다. Background : Vertebral compression fractures cause the limitation of physical, emotional, and daily living activity in elderly persons. There is no work that evaluates the effects of vertebral compression fractures on the physical, emotional, and daily living activity among Korean elderly patients. Thus, we undertook this study to learn about the clinical consequences and the functional impairment among elderly persons with vertebral compression fractures. Methods : The 68 patients over 60 years of age who had vertebral comperssion fractures documented in their medical records and admitted to the department of family medicine, Pundang CHA general hospital from September 1995 to June 1999 were enrolled in this study. We reviewed their medical records and investigated the site and the number of vertebral compression fractures, the presence of the associated pain, bone turnover markers and bone mineral density(BMD). The Katz Activities of Daily Living Scale(ADL) and Instrumental Activities of Daily Living Scale(IADL) were used to asses the patient's physical function, and Geriatric depression scale(GDS) was used to asses the patient's depression. Results: 62 women and 6 men comprised the study population. Their mean(±SD) age was 74.16(±6.88) years. 77.8%, 71.2%, 6.1%, and 12.2% of the patients had documented the past medical history of fall, back pain, use of wheel chair and cane, respectively. The mean number of vertebral compression fractures was 2.63(±0.29). Vertebral compression fractures were most commonly located in the L1 and Tl2 spines in sequence. The number of vertebral compression fracture was negatively correlated with BMD, but there was no significance(age adjusted, r=-0.179, p=0.239). There showed no difference of ADL, IADL, and GDS between single fracture and multiple fractures groups(p>.05). Conclusions : These data showed that the most common sites of vertebral compression fracture were LI and Tl2 spine. And there was no significant difference of functional status between single fracture and multiple fractures groups. But, significant difference of the number of vertebral compression fracture between the two groups who had or dindn't have back pain was noted in this study population.
장수호,박경채,김영무,Chang, Soo-Ho,Park, Kyung-Chae,Kim, Young-Moo 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6
Shaped Charge's penetration performance is depended on the shape of warhead and explosive, liner materials. The liner that manufactured to small homogeneous grain increase the penetration performance and decrease the deviation of penetration performance. This texture is obtained by forging process but, creating the process that remove crack and get small homogeneous grain is very hard. In this study, We success to get the homogeneous small grain texture through appling the most suitable process by DEFORM CODE analysis.
변형지도 모델링을 통한 구리 분말 소결체의 고온 변형에 따른 미세조직 연구
장수호,김영무,박경채,Chang, Soo-Ho,Kim, Young-Moo,Park, Kyung-Chae 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.2
P/M coppers are subjected to the isothermal compression tests at the strain rate ranging from 0.01 to 10.0 $s^{-1}$ and the temperature from 200 to $800^{\circ}C$. The processing map reveals the dynamic recrystallization (DRX) domain in the following temperature and strain rate ranges: $600-800^{\circ}C$ and 0.01-10.0 $s^{-1}$, respectively. In the domain, the region at temperature of $600^{\circ}C$ and strain rate of $10^{-2}s^{-1}$ shows peak efficiency. From the kinetic analysis, the apparent activation energy in the DRX domain is 190.67 kJ/mol and it suggests that lattice self-diffusion is the rate controlling mechanism.
플라즈마 용사에 의한 BSCCO 초전도체 형성을 위한 용사 분말의 제조에 관한 연구
박정식,조창은,박경채,Park, Jeong-Sik,Cho, Chang-Eun,Park, Kyung-Chae 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.6
Formation and characteristics of spraying powder for BSCCO High-Tc superconductor prepared by plasma spray coating were investigated. The addition of 3% of binder gives the best flowability of the powder. Ball milling for 30h and 35h gives the best flowability of powder in the case of 2001 and 0212, respectively. The withdraw ratio increases upon binder addition from 12 to 27% in the case of 2001 and from 18 to 31% in the case of 0212 for sieving powder of $30-90{\mu}m$ in size. The built-up efficiency for $100{\mu}m$ thickness of spray coating is increased more than 30% by binder addition. The microstructure of the spray coated layers was investigated by XRD and EDS analysis.
SmBCO 초전도 층착을 위한 RABiTS상의 CeO<sub>2</sub> 단일 버퍼 연구
김태형,김호섭,이남진,하홍수,고락길,하동우,송규정,오상수,박경채,Kim, Tae-Hyung,Kim, Ho-Sup,Lee, Nam-Jin,Ha, Hong-Soo,Ko, Rock-Kil,Ha, Dong-Woo,Song, Kyu-Jeong,Oh, Sang-Soo,Park, Kyung-Chae 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.6
As a rule, high temperature superconducting coated conductors have multi-layered buffers consisting of seed, diffusion barrier and cap layers. Multi-buffer layer deposition requires longer fabrication time. This is one of main reasons which increases fabrication cost. Thus, single buffer layer deposition seems to be important for practical coated conductor process. In this study, a single layered buffer deposition of $CeO_2$ for low cost coated conductors has been tried using thermal evaporation technique. 100 nm-thick $CeO_2$ layers deposited by thermal evaporation were found to act as a diffusion layer. $1\;{\mu}m-thick$ SmBCO superconducting layers were deposited by thermal co-evaporation on the $CeO_2$ buffered Ni-5%W substrate. Critical current of 90 A/cm was obtained for the SmBCO coated conductors.
T_6 處理한 6061 Al 合金의 高溫時效에 關한 速度論的 考察
尹秉河,朴景采 경북대학교 공과대학 1977 工大硏究誌 Vol.6 No.-
B' intermedate phase formation kinetics of 6061 Al heat treated alloy at high Temperature was studied by the hardness measurement and microstructure observation. B' phase is formed by the Heterogenous reaction through the single process. The activation energer for the B' intermediate phase formation is about 16.9kcal/mole. The kinetics shows B' phase formation rate is controlled by the diffusion of Mg and Si atom in the matrix, since The reaction order have found n=1/2. Equation of B' (stable phase) formation is as follows where logt=logt_o+(A)/(T) t=holding time A=constant T=absolute Temperature (°K)