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김정곤,최한신,김택수,Kim, Jeong-Gon,Choi, Han-Shin,Kim, Taek-Soo 한국분말야금학회 2009 한국분말재료학회지 (KPMI) Vol.16 No.6
Mg-Cu composites were successively fabricated using a combination of rapid solidification and extrusion processes. In addition, the microstructural variation of the composite was investigated by performing the extrusion repeatedly. It resulted that the composite formed an uniform and dense structure by the extrusion, and the microstructure became fine as the extrusion conducted repeatedly. The microstructural variation was known to be dependent on the number of extrusion and the area reduction ratio. The tensile strength was also measured as a function of the microstructural variation.
MAO 공정 변수가 TiO<sub>2</sub> 산화피막의 구조 및 광촉매 특성에 미치는 영향
김정곤,강인철,Kim, Jeong-Gon,Kang, In-Cheol 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.3
$TiO_2$ was successfully formed on a Ti specimen by MAO (Micro-Arc-Oxidation) method treated in $Na_3PO_4$ electrolyte. This study deals with the influence of voltage and working time on the change of surface microstructure and phase composition. Voltage affected the forming rate of the oxidized layer and surface microstructure where, a low voltage led to a high surface roughness, more holes and a thin oxidized layer. On the other hand, a high voltage led to more dense surface structure, wider surface holes, a thick layer and fewer holes. Higher voltage increases photocatalytic activity because of better crystallization of the oxidized layer and good phase composition with anatase and rutile $TiO_2$, which is able to effectively separate excited electrons and holes at the surface.
The Significance of Beaking Sign on Cystography in Stress Urinary Incontinence
김정곤,주명수,조경식,Kim, Jeong-Gon,Ju, Myeong-Su,Jo, Gyeong-Sik The Korean Radiological Society 2001 대한영상의학회지 Vol.45 No.4
Purpose: To evaluate the clinical and urodynamic significance of the beaking sign at cystography in patients with stress urinary incontinence (SUI). Materials and Methods: We retrospectively reviewed the cystograms of 253 patients with SUI, defining the beaking sign as the triangular contrast collection below the bladder base in the resting state without overt leakage. Various clinical parameters including patient age, symptom duration, parity, the one-hour pad test, and urodynamic study data including Valsalva leak point pressure (VLPP) and maximal urethral closing pressure (MUCP) were compared between the beaking-positive and the beaking-negative group. The distribution of Blaivas type in SUI between these two groups was also analysed. Results: The beaking sign was observed in 153 patients (60%). Those who were older and showed greater parity more often belonged to the beaking-positive group than the beaking-negative (p<0.05). Both VLPP and MUCP were significantly lower in the beaking-positive group than in beaking-negative group (p=0.03; p=0.01, respectively). Type-0 or -I SUI was more common in the beaking-negative group, while the frequency of other types was similar between the two groups. Conclusion: The beaking sign has clinical and urodynamic significance, reflecting functional deficiencies of the intrinsic sphincter, and may possibly be regarded as an additional parameter in the planning of treatment. 목적:긴장성 요실금 환자에 있어 방광조영술상 안정시 촬영 사진에서 보일 수 있는 새부리 징후의 임상적,요로역학적 의의를 알아보고자 하였다. 대상과 방법:253명의 긴장성 요실금이 있는 환자의 방광조영술을 후향적으로 분석하였다.방광조영술상 안정시 조영 제의 누출이 없는 상태에서 방광경부에 삼각형 모양으로 조영제가 보이는 것을 새부리 징후라 정의하였다.새부리 징후가 있는 군과 없는 군 사이에 나이,증상 기간,출산 횟수 등의 임상 인자와,발살바 요실금압 (Valsalva leak point pressure,VLPP)과 최대 요도 폐쇄압 (maximal urethral closing pressure,MUCP)등의 요로역학적 인자를 비교 분석 하였고,Blaivas분류에 의한 긴장성 요실금 유형의 분포를 비교하였다. 결과:새부리 징후는 153명(60%)에서 있었으며,각 임상 인자들 중 나이가 많을수록,출산 횟수가 많을수록 그 빈도가 유의하게 많았다 (p<.05).발살바 요실금압은 새부리 징후가 있는 군이 없는 군과 비교하여 유의하게 낮았으며 (p=.03),최대 요도 폐쇄압도 새부리 징후가 있는 군에서 유의하게 낮았다 (p=.01).Blaivas분류에 의한 제 0형과 1형 긴장성 요실금은 새부리 징후가 없는 군에서 많았으나,다른 유형은 두 군간에 차이는 없었다. 결론:새부리 징후는 임상적,요로역학적으로 의의가 있으며,내인적 괄약근의 결함을 반영 할 수 있으므로 치료방침을 계획함에 있어 고려해야 할 요소로 사료된다.