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전이금속을 첨가한 플라즈마 TiO₂ 복합 용사피막의 광전류 특성
고병천(Byung-Chun Ko),고영봉(Young-Bong Ko),박경채(Park Kyeung Chae) 한국표면공학회 2011 한국표면공학회지 Vol.44 No.3
In this study, the photocurrent characteristics of plasma sprayed TiO₂ coatings have been investigated according to additive transition metal (Fe, Mn, Nb powder) and heat treatment conditions. The plasma sprayed TiO₂ coatings by heat treatment at 400℃ and 90 min had the higher photocurrent at ultraviolet light, no photocurrent at visible light. The photocurrent of plasma sprayed TiO₂ coatings added by Fe, Mn, Nb (named by plasma sprayed TiO₂ composite coatings) was lower than that of plasma sprayed TiO₂ coatings at ultraviolet light, as was low in intensity ratio of XRD(101)/(110). and the atomic percentage of oxygen by plasma sprayed TiO₂ composite coatings was higher than that by plasma sprayed TiO₂ coatings. The photocurrent of plasma sprayed TiO₂ composite coatings in heat treatment at 400℃ and 90 min was higher than that of plasma sprayed TiO₂ coatings in same heat treatment conditions at ultraviolet and visible light, as was high in oxygen affinity by heat treatment.
윤태욱(Tae-Wook Yoon),고영봉(Young-Bong Ko),고병천(Byung-Chun Ko),박경채(Kyeung Chae Park) 한국표면공학회 2010 한국표면공학회지 Vol.43 No.5
FTMP(friction thermo-mechanical process) is an adaptation of friction stir welding, and can be used as a generic process to modify the microstructure at selective locations. In this study, in order to analyze characteristics of surface modification of ACA4 castings by FTMP, change of rotating speed(R/S) and traveling speed(T/S) of tool were applied as conditional parameter. Analysis of microstructure, hardness, surface roughness and depth of modified zone(MZ) were searched. The best condition were obtained at R/S 600 rpm and T/S 100 ㎜/min. At this time, hardness was 82 HV, the surface roughness was 0.07 ㎜ and the depth at MZ was 1.72 ㎜. Free defects microstructure and fine Si particles formation and strong forging effects were analyzed at MZ.
한국인 서혜부 피부판 작성시 필요한 혈관의 해부학적 관찰
고병천,유재덕,이영호 大韓成形外科學會 1982 Archives of Plastic Surgery Vol.9 No.1
In the field of plastic surgery, the flap has been a part of the reconstruction procedure and is a continuously developing one. Among generally practiced free flaps,the inguinal free flap is known to satisfy most of the prerequisites which a free flap must come to meet the condition(Morrison & O`Brien, 1980). Since Daniel and Taylor (1973) have succeeded inguinal free flap, neumerous successful results were reported. However, since neither general anatomy textbooks mention about the distribution of the inguinal blood vessels in detail, nor any domestic reports are satisfactory for clinical use, we observed and analyzed exclusively the origin of the superficial cricumflex iliac artery (SCIA), superficial interior epigastric artery (SIEA), their diameters at the origin, the relationship between the origin of the artery and inguinal ligament and the relationship between the two arteries, the relationship between the inguinal vessel and basic marks, the distribution and the size of the superificial circumflex iliac vein (SCIV) and superficial interior epigastric vein (SIEV) and location of the saphenous bulb by the dissections of 20 adult cadavers (18: bilateral, 2: unilateral). The results were summerized as follows: 1. SCIA and SIEA arise from the femoral artery in 7 cases (18.4%) as common trunk: In 5 cases (13.2%) as compensatory SCIA: in 26 cases (68.4%) as seperate origins. Origins other than femoral artery are from deep femoral artery, superficial pudendal artery and deep pudendal artery as total of 11 cases (28.9%) Symmetrical bilaterality of the arterial origin was about 40%. 2. The diameters at their origins of the SCIA and the SIEA are; common trunk, 1.6㎜(1.3-2.0㎜);compensatory SCIA, 1.3㎜ (1.2-1.5㎜) : seperate origins, SCIA and SIEA respectively 1.2(0.6-2.0㎜) and 1.3㎜(0.8-2.0㎜). 3. All arteries at their origins are located within 5㎝ below the inguinal ligament, except for 7 cases which have seperate origins, 4 of SIEA, and 3 of SCIA are located beyond 5㎝ mark. 4. In cases of seperate origin, the SCIA arises superior to SIEA in 20 cases (76.9%) and vice versa in 4 cases (15.4%). Only 2 cases (7.7%) arises at same level. 5. The SCIV and SIEV drain into a common trunk in 15 cases (39.5%), and into seperate veins in 23 cases (60.5%). The diameter of the veins of the common trunk is 2.3㎜ (2.0-5.0㎜), In cases of separate drainage, the SCIV and SIEV are 1.9㎜(1.2-2.0㎜) and 2.1㎜(1.2-2.5㎜) respectively and the saphenous bulb is located 4.4㎝ in an averge below the inguinal ligament. 6. In our cases, the SCIA & SCIV run laterally below & parallel to the inguinal ligament beneath the deep fascia giving off several cutaneous branches until the when the vessels travel into the subdermal plexus extending laterally in a distance of average 5㎝. The SIEA & SIEV pierce the deep fascia below the inguinal ligament & travel cranially crossing the ligarment continuously just superficial to the deep fascia in the lower abdomen giving off numerous branches which makes the abundant networks ?? others. Identification of these vascular territory is easily disclosed within a distant of at least 10㎝ cranial (above) to the inguinal ligament.
고병천,박병윤,유재덕 大韓成形外科學會 1983 Archives of Plastic Surgery Vol.10 No.1
This series comprised 4 patients with malunited facial bone fractures treated in the department of Plastic and Reconstructive Surgery at the Yonsei University Medical Center. Generally, it might be stated that acute fractures of the facial bones are not a surgical emergency. But it is desirable to institute definitive as soon as possible after injury but not before the general condition of the patient warrants. The management of deformity due to malunited facial bone fracture are discussd. The malunion can be managed by osteotomy and realignment of the fragments. The postoperative results are parallel to severity of trauma and duration from injury to management.