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국내산 함바나듐 티탄자철광으로부터 CaO 배소를 통한 바나듐 침출거동
신동주,주성호,이동석,전호석,신선명,Shin, Dong Ju,Joo, Sung-Ho,Lee, Dongseok,Jeon, Ho-Seok,Shin, Shun Myung 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.4
In this study, the leaching behavior of vanadium (V) was investigated through CaO roasting and sulfuric acid leaching from domestic V-bearing titanomagnetite (VTM). Changes in the phase according to the amount of CaO added and roasting temperature were analyzed. Regardless of the roasting conditions, perovskite (CaTiO<sub>3</sub>) was preferred to form. When the CaO content was increased, the calcium ferrite (CaFeO<sub>x</sub>) phase was formed; otherwise, ferrite (Fe<sub>2</sub>O<sub>3</sub>) was preferred. After CaO was roasted, leaching was performed for 6 h with 1M sulfuric acid at 50℃ and a 10% solid-liquid ratio. Results of leaching revealed that when the roasted product was sintered, V was not sufficiently oxidized, and the leaching efficiency decreased. In addition, when the roasting temperature was low, the leaching efficiency of V decreased due to the influence of unreacted excess CaO. To lower the leaching efficiency of iron and titanium in VTM concentrates, suppressing the formation of CaTiO<sub>3</sub> and CaFeO<sub>x</sub> was necessary by minimizing the amount of CaO added. Consequently, a leaching efficiency of 86% V, 4.3% Fe, and 6.5% Ti was obtained when the roasted product of 1150℃ and 10 wt% CaO was leached.
저품위 동광으로부터 습식제련공정에 의한 구리의 분리 공정 연구
신동주,주성호,이동석,전호석,신선명,Shin, Dong Ju,Joo, Sung-Ho,Lee, Dongseok,Jeon, Ho-Seok,Shin, Shun Myung 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.5
In this study, we attempted to separate and recover Cu from low-grade copper ore by a hydrometallurgical process. The leaching sample obtained after crushing and sieving by 0.355 mm of low-grade copper ore contained 1.5% Cu, 4.7% Fe, 1.0% Mn, and 0.3% Zn. The Cu in the oxide ore was very well leached into sulfuric acid and 97% Cu leaching efficiency was achieved at 80℃ and 3 M sulfuric acid (H<sub>2</sub>SO<sub>4</sub>). From the leaching solution, Cu was separated by solvent extraction from Fe, Mn, and Zn using LIX984N. The separation tendency between Cu and other metals was confirmed through the distribution ratio and separation factor. By plotting the McCabe-Thiele Diagram, the optimum condition for recovering Cu is 5 vol.% LIX984N, 2-stage counter-current solvent extraction, and an O/A ratio of 0.5. Using this method, 99% of the Cu was extracted and a CuSO<sub>4</sub> solution was finally obtained that contained 1.6 g/L Cu after the stripping process using 2 M H<sub>2</sub>SO<sub>4</sub>.
Halofuginone 국소 도포가 피부 창상 치유에 미치는 영향
신동주(Dong Ju Shin),김도원(Do Won Kim),이석종(Seok Jong Lee),김정철(Jung Chul Kim) 대한피부과학회 2000 대한피부과학회지 Vol.38 No.3
N/A Background:During normal wound healing the formation of scars and fibrous tissue occurs, which consists largely of collagen fibril, but excessive fibrosis and scar formation become clinical problems. Collagen remodelling during scar formation is dependent on both continued collagen synthesis and collagen catabolism. Halofuginone, a plant alkaloid, is known to inhibit collagen type I synthesis at the transcriptional level. Objective:The purposes of this study were to investigate the effects of topical application of halofuginone on the healing of wounds. Method:Topical solutions containing halofuginone of variable concentrations were applied on the full-thickness excisional wounds of hairless mice and 0.1% halofuginone ointments applied on the suture site of rats and the normal skin of hairless mice daily. In addition, we performed a one-time intradermal injection of 0.1% halofuginone solution on the normal skin of the hairless mice. We examined the collagen content of the skin of hairless mice and rats treated with halofuginone solutions and ointments during the healing process by performing hematoxylin-eosin and Masson's trichrome stains. We assessed, from time to time, the change in the full-thickness excisional wound size of hairless mice treated with halofuginone solutions of variable concentrations during the healing process and observed clinically the healing process of hairless mice with the full-thickness excisional wound. Result: 1. The wound size after daily application of 0.001% and 0.1% halofuginone solutions on the full-thickness excisional wounds of hairless mice decreased more slowly in comparison with the control group(p<0.05). (Korean J Dermatol 2000;38(3):305~313)
증례 보고 : 요골 원위부 골절의 수장 금속판 고정술 후 근위부 나사못에서 발생한 장무지 신전건 파열 -증례 보고-
신동주 ( Dong Ju Shin ),남승오 ( Seung Oh Nam ),조훈식 ( Hun Sik Cho ) 대한골절학회 2013 대한골절학회지 Vol.26 No.4
요골 원위부 골절에서 수장 금속판 고정술 후 돌출된 원위부의 나사못에 의해 발생한 장무지 신전건 파열에 관한 보고는 증가하고 있다. 그러나 저자들은 국내외 보고가 매우 드문 근위부 나사못의 돌출부에서 발생한 장무지 신전건 파열 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. As volar plate fixation of distal radius fracture becomes more common, reports of ruptured extensor pollicis longus tendon by a protruding distal screw tip are also increasing steadily. Authors have experienced a rare case of ruptured extensor pollicis longus tendon at the prominent proximal screw of fixed volar plate for distal radius fracture, and we report it herein with a review of the literature.
보육교사의 영유아 및 학부모에 대한 정서노동유형과 정서표현규칙지각 및 정서조절전략 간의 관계 연구
신동주(Dong Ju Shin),엄소명(So Myoung Um) 한국보육학회 2020 한국보육학회지 Vol.20 No.3
Objective: The purpose of this study was to examine the relationship among emotional labor types performed by childcare center teachers for young children and parents, their perception of emotional display rules, and emotion regulation strategies used by them. Methods: A survey was conducted on 133 teachers working at child care centers in the Seoul metropolitan area. Pearson Correlation was calculated to find out the relationship among emotional labor types, perception in emotional display rules, and emotion regulation strategies. Multiple regression was conducted to find out the impact of childcare teachers perception of emotional display rules and emotion regulation strategies on emotional labor types. Results: The main results of this study were as follows. First, child care teachers experienced both surface acting and deep acting of emotional labor at higher levels for young children and parents. In addition, it was found that the teachers performed more deep acting than surface acting. Also, in the case of surface acting, the teachers performed it more frequently in the interaction with parents than with young children. Second, childcare center teachers perception of emotional display rules had a positive correlation with their emotional labor for young children and parents. Also, antecedent-focused emotional regulation strategies had a positive correlation with deep acting, while response-focused emotion regulation strategies had a positive correlation with surface acting. Conclusion/Implications: This study had implications for providing basic data to understand the aspect of emotional labor experienced by child care teachers and emotional health support measures for them.
신동주(Dong-Ju Shin),권기태(Ki Tae Kwon),허동명(Dong-Myeong Huh),김지환(Ji-Hwan Kim),박재영(Jae-young Park),이충열(Chung-Yeol Lee) 대한견주관절의학회 2010 대한견주관절의학회지 Vol.13 No.1
목적: 감염성 심내막염과 동반된 견관절 화농성 관절염의 치료 경험을 보고하고자 한다. 대상 및 방법: 감염성 심내막염에 동반한 화농성 견관절염을 가진 70세 남자 환자에 대하여 심장 판막 치환술 및 관절경하 활막 절제술과 배농술을 시행 하였다. 결과: 감염에 대한 순조로운 치유와 기능의 회복을 보였다. 결론: 상대적으로 견관절에 화농성 관절염이 동반되는 경우는 매우 드문 것으로 보고 되고 있으나 감염성 심내막염에 동반하는 일반적인 근골격계 증상으로 간과한다면 심각한 합병증으로 발생할 수 있음으로 주의 깊게 판단하여야 한다고 생각한다. Purpose: We report a case of pyogenic arthritis of the shoulder secondary to infective endocarditis. Materials and Methods: A 70 year-old male who had suffered from pyogenic arthritis of the left shoulder secondary to infective endocarditis was treated with artificial valvuloplasty, arthroscopic synovectomy and drainage. Results: Infection was cured and the patient achieved a good functional outcome. Conclusion: Pyogenic arthritis of the shoulder is rarely associated with infective endocarditis. However, if the symptoms are misdiagnosed as musculoskeletal symptoms associated with infective endocarditis, serious complications may arise. As such, musculoskeletal symptoms associated with infective endocarditis should be paid careful attention.
신동주(Dong-Ju Shin),남승오(Seung-Oh Nam),김태은(Tae-Eun Kim),박기홍(Ki-Hong Park) 대한정형외과학회 2015 대한정형외과학회지 Vol.50 No.1
견관절의 극상근 내 침윤성 근육 내 지방종은 극히 드문 증례로 저자들은 극상건의 부분 파열이 동반된 극상근 내 침윤성 지방종 환자에 대해 수술적 제거 및 회전근개의 봉합술을 시행하였고, 1년 추시 자기공명영상 결과상에서도 만족스러운 결과를 얻어 이에 대한 문헌 고찰과 함께 보고하고자 한다. Infiltrating lipoma in supraspinatus muscle on the shoulder is very rare. We performed open excision and rotator cuff repair on a patient who had infiltrating lipoma in supraspinatus muscle with partial tear of the supraspinatus tendon. We achieved a satisfactory outcome on one-year follow-up magnetic resonance imaging. We report on the case with a review of the literature.