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상용 이온교환수지를 이용한 Rh(3) 의 이온교환 특성
정장환,유재형,김광락,이성호,정흥석 한국공업화학회 1998 응용화학 Vol.2 No.2
High-level wastes contain significant quantities of platinum group metals such as Pd(II), Rh(III), and Ru(III). There are many techniques such as solvent extraction, precipitation, and adsorption methods for the separation of Rh(III). In this paper, batch experiments were carried out to investigate ion exchange characteristics of Rh(III) from a nitric acid solution by commercial cation and anion exchange resins such as Dowex 50W, IRN 78 and Dowex 1x8. The effects of ionic group of resins, solution temperature, and the concentration of nitric acid were investigated. And the elution characteristic of Rh(III) by various eluents was studied.
정장환,윤덕미,황규현,윤경봉 대한통증학회 2008 The Korean Journal of Pain Vol.21 No.3
Polymyalgia rheumatica is characterized by bilateral shoulder or pelvic girdle pain, morning stiffness of greater than 45 minutes' duration, constitutional symptoms, an elevated erythrocyte sedimentation rate and a rapid response to prednisolone (≤ 20 mg/day). Although it is not a rare disease, many cases might be neglected and treated inappropriately in pain clinics. We describe here two cases of polymyalgia rheumatica that was neglected and treated inappropriately. (Korean J Pain 2008; 21: 241-243)
김병구,정장환 대한기계학회 1983 大韓機械學會誌 Vol.23 No.5
본 시험설비에서 수행되는 각종 시험마다 시험조건, 즉, 온도, 압력 및 유량등이 크게 다를 뿐만 아니라, 고온고압에 수반되는 제반 문제들이 뒤따름으로서 이들 변수의 측정 및 제어에 있어서는 특별한 어려운 점이 뒤따른다. 본 해설에서는 고온고압 유체시험설비에서 수행되는 각종 시험의 주요 변수가 되는 온도, 압력 및 유량등 시험변수의 측정 및 제어방법과 운전경험등을 기술코저 한다.
Dermoscopic features of an unusual case of targetoid hemosiderotic nevus
정순문,정장환,권도익,성설화,장지윤,박종빈,장민수 고신대학교(의대) 고신대학교 의과대학 학술지 2023 고신대학교 의과대학 학술지 Vol.38 No.3
Targetoid hemosiderotic nevus (THN) is a rare variant of melanocytic nevus, characterized by a sudden development of a targetoid ecchymotic halo around a pre-existing nevus. THN clinically raises concern for malignant transformation due to its abrupt change in color and size. THN should be distinguished from other diseases showing a peripheral halo, including targetoid hemosiderotic hemangioma, halo nevus, and Meyerson nevus. Dermoscopy can help clinicians to differentiate THN from these diseases. The typical dermoscopic features of THN are known to be divided into two distinctive areas: the central melanocytic area and the peripheral ecchymotic area. In our case, dermoscopy revealed a novel bull’s eye pattern composed of a central area with characteristic features of benign melanocytic nevus, an intermediated white circular ring, and a peripheral milky red area. When a sudden change occurs in a pre-existing nodule showing targetoid features, dermoscopy should be considered before conducting a biopsy or surgical intervention.