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전기선폭발법으로 제조한 나노 W(텅스텐) 분말의 환원처리 및 방전플라즈마소결에 의한 조밀화
김지순,김철희,박은주,권영순,김진천,이성호,정동익,Kim Ji-Soon,Kim Cheol-Hee,Park Eun-Ju,Kwon Young-Soon,Kim Jin-Chun,Lee Sung-Ho,Jung Dong-Ik 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.4
[ ${\beta}-W(W_3O)$ ] oxide layer on the surface of each W(tungsten) nanopowder produced by the electric explosion of wire(EEW) process were formed during the 1vol.% air passivation process. The oxide layer hindered sintering densification of compacts during SPS process. The oxide phase was reduced to the pure W phase during SPS. The W nanopowder's compacts treated by the hydrogen reduction showed high sintered density of 94.5%. after SPS process at $1900^{\circ}C$.
$Cu-TiB_2$ 나노 금속복합재의 물성치에 대한 연구
김지순,장명규,염영진,Kim Ji-Soon,Chang Myung-Gyu,Yum Young-Jin 한국복합재료학회 2006 Composites research Vol.19 No.2
[ $Cu-TiB_2$ ] metal matrix composites with various weight fractions of $TiB_2$ were fabricated by combination of manufacturing process, SPS (self-propagating high-temperature synthesis) and SPS (spark plasma sintering). The feasibility of $Cu-TiB_2$ composites for welding electrodes and sliding contact material was investigated through experiments on the tensile properties, hardness and wear resistance. To obtain desired properties of composites, composites are designed according to reinforcement's shape, size and volume fraction. Thus proper modeling is essential to predict the effective material properties. The elastic moduli of composites obtained by FEM and tensile test were compared with effective properties from the original Eshelby model, Eshelby model with Mori-Tanaka theory and rule-of-mixture. FEM result showed almost the same value as the experimental modulus and it was found that Eshelby model with Mori-Tanaka theory predicted effective modulus the best among the models.
김지순(Ji-Soon Kim),유희정(Hee-Jeong Yoo),조인희(In-Hee Cho),박태원(Tae-Won Park),손정우(Jung-Woo Son),정운선(Un-Sun Chung),신민섭(Min-Sup Shin),김붕년(Bung-Nyun Kim),김재원(Jae-Won Kim),양영희(Young-Hui Yang),강제욱(Je-Wook Kang),송숙 대한소아청소년정신의학회 2011 소아청소년정신의학 Vol.22 No.3
Objective:A significant proportion of children with autism spectrum disorders (ASD) have regression characterized by loss of previously acquired skills. The purpose of this study was to compare demographic, clinical characteristics and autism-related symptomatology of the children who have regression with children who don’t have regression. Methods:The subjects with ASD and their unaffected siblings (SIB) were recruited from the Korean Autism Genetic Study Consortium. Typically developing children (TC) were volunteered from community. The subjects were administered the Korean version of Autism Diagnostic Interview-Revised (K-ADI-R) and the Korean version of Autism Diagnostic Observation Schedule (K-ADOS) to diagnose or exclude ASD. Regression was defined on the basis of K-ADI-R data. The Korean version of Vineland Adaptive Behavior Scale (K-VABS), Aberrant Behavior Checklist (K-ABC) and Social Responsiveness Scale (K-SRS) were obtained from their parents. Results:Regression occurred in 8.33% (n=14) of children with ASD (n=168). Any SIB (n=166) and TC (n=53) did not experience regression. Regression was associated with lower IQ and lower score of K-VABS. There was no difference in autism symptom severity and K-ABC, K-SRS scores, between children with ASD who experienced regression and who did not. Conclusion:Regression seems to be a distinctive feature of ASD. Regression is associated with cognitive and more general functions, rather than symptoms specific to autism.
자폐스펙트럼장애 환자에서 나타나는 운동 상동증 유무에 따른 임상 특성의 차이
김지순(Ji-Soon Kim),유희정(Hee-Jeong Yoo),배정훈(Jeong-Hoon Bae),조인희(In-Hee Cho),박태원(Tae-Won Park),손정우(Jung-Woo Son),정운선(Un-Sun Chung),신민섭(Min-Sup Shin),김붕년(Bung-Nyun Kim),김재원(Jae-Won Kim),양영희(Young-Hui Yang) 대한소아청소년정신의학회 2015 소아청소년정신의학 Vol.26 No.1
Objectives:Repetitive and stereotyped behaviors are core symptoms in children with autism spectrum disorders (ASD). The purpose of our study was to investigate the frequency of motor stereotypes in ASD children and their clinical features. Methods:Among 171 ASD children (age range, 3?15), the ASD group with motor stereotypes was defined according to two items in the Korean version of Autism Diagnostic Interview-Revised (K-ADI-R). We compared the clinical features, behavior problems and severity of other domains in the K-ADI-R and executive functions between the ASD group with motor stereotypes and the ASD group without motor stereotypes. Results:Ninety (52.6%) of 171 ASD children had motor stereotypes. The ASD group with motor stereotypes had a lower intelligence quotient score (62.23 vs. 84.94, p<.001) compared to the ASD group without motor stereotypes. The ASD group with motor stereotypes had more impairments in the social interaction domain [adjusted odds ratio (AOR) 1.11, p=.001] and communication domain (AOR 1.15, p=.008). Thought problems and lethargy were more frequent in the ASD group with motor stereotypes than the ASD group without motor stereotypes (AOR 2.059, p=.034 ; adjusted OR 1.045, p=.046). However, no significant differences in executive function were observed between the ASD group with motor stereotypes and the ASD group without motor stereotypes. Conclusion:The ASD group with motor stereotypes showed more impairment in social interaction and communication domains, which are core symptoms of autism. Motor stereotypes may indicate greater severity of ASD.
AlN 세라믹스와 금속간 계면접합에 관한 연구: II. AlN/Cu 접합체의 잔류응력에 미치는 Mo 중간재의 영향
박성계,김지순,유희,염영진,권영순,Park, Sung-Gye,Kim, Ji-Soon,You, Hee,Yum, Young-Jin,Kwon, Young-Soon 한국재료학회 1999 한국재료학회지 Vol.9 No.10
활성금속브레이징법으로 계면접합된 AlN/Cu 접합체의 잔류응력 완화에 미치는 Mo 중간재의 영향을 조사하였다. 유한요소법에 의한 응력 해석과 접합체 강도 측정, 파단면의 관찰을 행하였으며, 이들 결과를 비교, 분석하였다. 응력 해석 결과로부터, Mo 중간재를 사용할 경우 최대 잔류 주응력이 형성되는 위치가 AlN/삽입금속 계면으로부터 삽임금속/Mo 계면을 통하여 Mo 내부로 이동됨을 확인하였다.접합체의 자유표면에 형성되는 인장성분의 응력집중 위치는 Mo 중간재 두께가 증가됨에 따라 Cu/Mo 계면과 Mo/AlN 계면의 두 곳으로 분리되었으며, AlN측 잔류응력의 크기는 크게 감소하였다. 중간재를 사용하지 않은 경우 최대 접합강도가 52 MPa로 낮은 강도를 보였으나, 두께 400$\mu\textrm{m}$ 이상의 Mo 중간재를 사용한 접합체의 경우, 200 MPa 이상, 최대 275 MPa의 접합강도를 얻을 수 있었다. Effect of Mo interlayer on the relaxation of residual stress in AlN/Cu pint bonded by active-metal brazing method was investigated. The stress analyses by finite-element-method, the measurement of pint strength and the observation of fracture surface were carried out and their results were compared with each other. From the results of stress analysis it is confirmed that a Mo interlayer led to a shift of maximum stress concentration site from AlN/insert-metal interface$\rightarro$ insert-metal/Mo$\rightarro$Mo interlayer. Additionally, with increase of the Mo interlayer thickness the stress concentration with tensile component was separately built both at the interface of Cu/Mo and AlN/Mo. whereby the residual stress in the free surface of AlN close to the bonded interface was drastically reduced. The AlN/Mo/Cu pints with Mo interlayer thickness of above 400$\mu\textrm{m}$ showed the strengths higher than 200 MPa. upto max. 275 MPa, while the AlN/Cu pint only max. 52 MPa.