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만성신부전증에서 혈액투석으로 변경 후 호전을 보인 다발성 전이성 피부 석회증 1예
최인혜 ( In Hye Choi ),박철종 ( Chul Jong Park ),이경호 ( Kyung Ho Lee ) 대한피부과학회 2019 대한피부과학회지 Vol.57 No.5
Metastatic calcinosis cutis refers to the deposition of calcium salts in normal tissue secondary to an underlying defect in calcium and/or phosphate metabolism. It commonly affects periarticular areas in patients with chronic renal failure. We report a case of a 51-year-old man with a past medical history of peritoneal dialysis for chronic renal failure, who presented with multiple yellowish nodules on his right thumb. In view of the asymptomatic non-inflamed fluctuating nodules, the differential diagnoses included bacterial, tuberculous, atypical mycobacterial, or fungal infections. Histopathological and radiological examinations revealed calcifications in the right thumb and shoulder with elevated serum phosphorus and parathyroid hormone levels. The lesions improved after the patient was switched from peritoneal dialysis to hemodialysis. We report a case of metastatic calcinosis cutis in a patient with chronic renal failure. We emphasize the importance of imaging for accurate diagnosis and follow-up of calcinosis cutis and that hemodialysis scores over peritoneal dialysis in the treatment of this condition. (Korean J Dermatol 2019;57(5):270∼273)
PEO 전류밀도 조건에 따른 알루미늄도금 강재상 산화코팅막의 특성
최인혜(In-Hye Choi),이훈성(Hoon-Seung Lee),이명훈(Myeong-Hoon Lee) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.5
Plasma electrolytic oxidation(PEO) has attracted attention as a surface treatment which has high wear resistance and corrosion resistance. PEO is generally considered as cost-effective, environmentally friendly and superior in terms of coating performance. Most of studies about the PEO processes have been applied to light metals such as Al and Mg. Because the strength of Al and Mg is weaker than that of steel, there is a limit to the application. In this study, PEO process was used to form oxide coatings on Hot dipped aluminized(HDA) steel and the characteristics of the coating film according to the PEO current density were studied. The morphology was observed by SEM and component was analyzed by using EDS. The corrosion behaviors of PEO coating films were estimated by exposing salt spray test at 5 wt.% NaCl solution and measuring polarization curves in deaerated 3 wt.% NaCl solution. With the increase of PEO process current density, the pore size of the coating surface and the thickness of coating increased. It was confirmed that no Fe component was present on the coating surface. PEO coating films obviously showed good corrosion resistance compared with HDA. It is considered that the PEO coating acts as a barrier to protect the base material from external factors causing corrosion.
해양환경 중 음극전류 프로세스에 의해 강판에 형성된 석회질 피막의 특성 분석
박준무(Jun-Mu Park),강재욱(Jae Wook Kang),최인혜(In-Hye Choi),이승효(Seung-Hyo Lee),문경만(Kyung-Man Moon),이명훈(Myeong-Hoon Lee) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.2
Cathodic protection is widely recognized as the most cost effective and technically appropriate corrosion prevention methodology for the port, offshore structures, ships. When applying the cathodic protection method to metal facilities in seawater, on the surface of the metal facilities a compound of calcium carbonate(CaCO₃) or magnesium hydroxide(Mg(OH)₂) films are formed by Ca<SUP>2+</SUP> and Mg<SUP>2+</SUP> ions among the many ionic components dissolving in the seawater. And calcareous deposit films such as CaCO₃ and Mg(OH)₂ etc. are formed by the surface of the steel product. These calcareous deposit film functions as a barrier against the corrosive environment, leading to a decrease in current demand. On the other hand, the general calcareous deposit film is a compound like ceramics. Therefore, there may be some problems such as weaker adhesive power and the longer time of film formation uniting with the base metal. In this study, we tried to determine and control the optimal condition through applying the principle of cathodic current process to form calcareous deposit film of uniform and compact on steel plate. The quantity of precipitates was analyzed, and both the morphology, component and crystal structure were analyzed as well through SEM, EDS and XRD. And based on the previous analysis, it was elucidated mechanism of calcareous deposit film formed in the sacrificial anode type (Al, Zn) and current density (1, 3, 5 A/㎡) conditions. In addition, the taping test was performed to evaluate the adhesion.