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 (H₂SO₄). 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 CuSO₄ solution was finally obtained that contained 1.6 g/L Cu after the stripping process using 2 M H₂SO₄.

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 (CaTiO₃) was preferred to form. When the CaO content was increased, the calcium ferrite (CaFeO_x) phase was formed; otherwise, ferrite (Fe₂O₃) 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 CaTiO₃ and CaFeO_x 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.

금속판을 이용한 구상돌기 골절의 치료

신동주(Dong-Ju Shin),변영수(Young-Soo Byun),조영호(Young-Ho Cho),박호원(Ho-Won Park),윤희민(Hee-Min Youn),한재휘(Jae-Hui Han) 대한견주관절의학회 2008 대한견주관절학회지 Vol.11 No.2

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)

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.

카지노업장의 서비스스케이프에 따른 종사원의 내적반응이 조직유효성에 미치는 영향에 관한 연구

신동주(Dong Ju Shin),선우영수(Young Soo Sunwoo) 한국관광연구학회 2015 관광연구저널 Vol.29 No.5

The theoretical model based on the Bitner(1992)’s environmental psychological research (Mehrabian & Russell, 1974) has been applied to the studies on servicescape from the customer’s point of view and from the staff’s point of view in various fields (hotel, kitchen, restaurant, festival, event, etc.). However, with the purpose of developing and managing competitive servicescape suitable for Kangwonland casino, this study tried to apply the Bitner’s theoretical model to empirically analyze it, focusing on Employees at Kangwon Land Casino. This study tried to investigate the components of servicescape based on the Bitner(1992)’s research and to empirically analyzed the relations between the service scape and the internal responses of the casino employees and the organizational effectiveness. The following are the implications drawn from the research results: First, it was found that there was no difference between the service scape components from the customer’s perspective and those from the employee’s perspective, suggested in the previous studies. Second, it was found that if the aesthetic impression (aesthetic elements such as the interior design) and convenience (ease of use related to the job performance) of the casinos were fully considered when designed, employees’ concentration would be increased, so that they would perform their job stably and the organizational effectiveness would be improved. Therefore, based on these research results, for the effective and competitive management of human resources in terms of internal marketing, the fact should be reflected that the service scape components of the casinos arouse psychological responses.

분만에 의한 치골 결합의 분리

신동주 ( Dong Ju Shin ),변영수 ( Young Soo Byun ),장세앙 ( Se Ang Chang ),박옥랑 ( Ok Rang Park ),김신윤 ( Shin Yoon Kim ),황대희 ( Dae Hee Hwang ),이성락 ( Sung Rak Lee ),김동영 ( Dong Young Kim ) 대한골절학회 2006 대한골절학회지 Vol.19 No.4

목적: 분만과 관련한 치골 결합 분리의 임상적 특징 및 발병률을 알아보고 정상군과의 비교를 통하여 위험인자를 확인하며 치료결과를 분석하였다. 대상 및 방법: 1992년 1월부터 2004년 12월까지 66,721명의 분만 중, 치골 결합 분리로 진단된 72명을 대상으로 하였다. 치골 결합부 분리 증상이 없었던 산모 498명을 대조군으로 정하고 χ2-검사와 Student t-검사를 사용하여 위험인자를 분석하였고, 최종 추시에서 방사선학적 평가와 Majeed의 방법을 이용한 기능적 평가를 하였다. 결과: 치골 분리의 간격은 평균 13.8 mm (범위, 6∼43)이고 최종 추시상 평균 4.9 mm (범위, 3∼16)였으며 증상의 발현은 분만 중에서부터 분만 후 3일까지 다양한 시기에 나타났다. 발병률은 927명 중 1명이었고 통계학적 검증을 통하여 신생아의 체중, 분만 2기의 지연, 분만 시 흡인기의 사용이 위험인자로 확인되었다. 최종 추시된 63명 중 우수 52예 (82.5%), 양호 9예 (14.3%), 보통 2예 (3.2%)였다. 결론: 분만에 의한 치골 결합의 분리는 태아의 체중이 많이 나가는 경우, 분만 2기가 지연되는 경우, 분만 시 흡인기가 필요한 경우 위험성이 증가하였다. 최종 추시 상 다양한 방사선학적 결과에도 불구하고 보존적 치료로 좋은 결과를 얻을 수 있었다. Purpose: To evaluate the clinical features and incidence of separation of the symphysis pubis during childbirth, and to evaluate the risk factors of the lesion and the outcome of treatment. Materials and Methods: Seventy two cases of separation of symphysis pubis among 66,721 delivery between January 1992 and December 2004 was selected. The control group was composed of 498 cases without separation of symphysis pubis during childbirth. Several factors increasing the risk of this lesion were assessed using x2-test and Student t-test. The final outcome was evaluated on radiographs and the grading system of Majeed. Results: Mean width of the joint was initially 13.8 mm (range, 6∼43) and finally 4.9 mm (range, 3∼16). Onset of symptoms occurred variably from labor to postpartum day 3. Incidence of separation of symphysis pubis was one among 927 deliveries. The separation group differed significantly from the control with respect to birth weight, the prolonged 2nd stage of labor, and the use of vacuum-delivery. Of 63 cases at final, 52 cases (82.5%) had excellent result, 9 (14.3%) had good and 2 (3.2%) had fair. Conclusion: The result showed that high birth weight, the prolonged second stage of labor and vacuum-delivery were risk factors of separation of the symphysis pubis during childbirth. This lesion was treated well with conservative methods, although variable radiological findings were noted at final follow-up.

피스톤 로드 제조공정에서 검사 및 이송 자동화시스템 개발

신동주(Shin, Dong-Joo),김경록(Kim, Kyeong-Rok),이형호(Lee, Hyung-Ho),정호연(Chung, Ho-Yeon) 한국산학기술학회 2010 한국산학기술학회 학술대회 Vol.- No.-

피스톤 로드는 자동차의 진동과 충격을 흡수해 주는 현가장치인 쇽옵소버의 주요 부품의 하나로서 쇽옵소버의 성능에 중요한 영향을 주기 때문에 높은 치수정밀도와 표면 매끄러움을 요구한다. 피스톤 로드의 생산 공정은 원자재 입고 및 적재→절단→열처리→선삭→홈가공→밀링→전조→검사 및 포장 순으로 작업이 진행된다. 생산공장에서는 하루 평균 1만5천개 정도의 피스톤 로드를 생산하고 있기 때문에 사이클 타임을 줄이고 생산의 효율성을 향상시키기 위해 자동화가 필요하다. 본 연구에서는 피스톤 로드의 생산공정중에서 검사공정과 피스톤 로드에 나사산을 만드는 전조 공정후에 가공부품을 넘겨주는 수작업 공정을 성력화하고 사이클 타임을 획기적으로 줄일 수 있는 자동화시스템 구축방안을 제시한다. 이를 위해 검사 및 이송장치에 대한 세부적인 검사장치, 정렬장치, 이송장치, 적재장치에 대한 세부 설계 방안과 모델링 수행 결과를 분석하고 제시한다.

적과 단감의 장아찌 제조 중 이화학적 특성 변화

신동주(Dong-Joo Shin),김광호(Kwang-Ho Kim),손규목(Gyu-Mok Son),이승철(Seung-Cheol Lee),황용일(Yong-Il Hwang) 한국식품영양과학회 2000 한국식품영양과학회지 Vol.29 No.3

적과 단감은 비타민 A와 C등의 영양 성분이 함유되어 있으나 전량 폐기 처분되고 있다. 이러한 적과 단감의 이용 가능성을 발견하기 위해 적과 부유 단감으로 15℃, 60일간 숙성 중의 경도, 색도, pH 및 염도의 변화와 기호도, 색, 냄새, 염도 및 조직감 등을 10일 간격으로 측정하였다. 적과 단감 장아찌의 경도는 처음 10일간은 감소하였으나 이후 일시적으로 증가하였으며 30일 이후에는 감소하여 연화되였다. 색도의 변화는 명도(L)는 염수 장아찌와 고추장 장아찌 모두 숙성기간 중 감소하였으며 ΔE 값은 고추장 장아찌의 경우 처음 30일간, 염수 장아찌는 40일까지 증가 후 감소하였다. 고추장 장아찌와 염수 장아찌 pH의 변화는 처음 10일간은 큰 감소 폭을 나타내었지만 이후에는 서서히 감소하여 숙성 60일째에는 각각 4.5와 4.0을 나타내었다. 염도는 장아찌의 경우 점차 증가하여 60일째에는 고추장 장아찌 5.8, 염수 장아찌는 6.1이 되었으며 침지액의 염도는 점차 감소하여 60일 후에 각각 5.8과 5.4로 나타났다. 각각의 장아찌에 대한 관능 검사를 실시한 결과 숙성 40일째에 기호도가 가장 높았으며 전반적인 기호도는 고추장 장아찌는 5.9, 염수 장아찌는 4.3으로 나타나 적과 단감을 이용한 고추장 장아찌의 이용 가능성을 발견할 수 있었다. To develop a new pickle with prepersimmon. changes of physicochemical properties and sensory test during storage of kochujang and salt pickles were investigated at 15℃ for 60 days. Hardness and color of the pickles decreased with proceeding of maturation period. and was completely soften after 30 days for the kochujang pickle and after 40 days for the salt pickle. The pHs of pickles maturated for 60 days were changed to 4.5 in the kochujang pickle. and to 4.0 in the salt pickle. respectively. Salt value of both the pickles were 5.8 and 5.4. respectively. Sensory test was favored at the kochujang pickle with 40 days. Color. flavor. salt concentration. texture. and overall acceptability of the kochujang pickle were higher than those of salt pickle. Therefore, the pickles could be used as a novel prepersimmon fermentation food.

극상 건 파열을 동반한 극상근 근육 내 지방종

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.