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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>.
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.
신동주(Shin, Dong-ju) 한국문화관광학회 2002 문화관광연구 Vol.4 No.2
Tourism development policy at the governmental level have focused the inland development for many years. As a result, Marine Tourism in Korea had been long considered to be slackend relative to the country’s abundant resource potentials. In the recent year, however, many evidences suggest that marine tourism has rapidly increased owing to leisure time and disposable incomes. This study attempts to provide the policy options for the marine tourism development in Korea, based on the analyses both of the point at issues and the present condition in marine tourism development.
유아교사의 Pre-coding 활동에 대한 관심도 연구:관심중심수용모형(CBAM)을 중심으로
신동주 ( Shin Dong Ju ),김세은 ( Kim Se Eun ) 한국유아교육학회 2021 유아교육연구 Vol.41 No.4
본 연구의 목적은 Hall과 Hord(2006)가 제안한 관심중심수용모형(CBAM)에 근거하여 유아 Pre-coding 활동에 대한 유아교사의 관심도를 살펴보는 것이다. 유치원과 어린이집에 근무하는 유아교사 총 300명이 CBAM 설문에 응답하였으며, 설문결과는 SoCQ 채점 분석표를 사용하여 분석하고 SoCQ 프로파일로 나타내었다. 유아교사의 Pre-coding 활동에 대한 관심도를 살펴본 결과 0단계(지각)에서 관심지수가 가장 높았으며, 4단계(결과)에서 관심지수가 가장 낮게 나타났다. 이 결과는 참가자의 사용수준(LoU)이 비사용자 패턴으로 유아교사가 Pre-coding 활동에 대한 지식이 거의 없음을 나타낸다. 유아교사의 배경변인에 따른 관심도의 차이를 살펴보기 위해 T-검증과 일원분산분석을 실시한 결과, Pre-coding에 대한 연수여부에 따라 6단계(재조정)에서 유의한 차이가 나타났다. 또한 Pre-coding 활동에 대한 이해도에 따라 3단계(운영)를 제외한 모든 단계에서 유의한 차이가 있었다. 이와 같은 결과는 유아교육현장에서 Pre-coding 활동이 이루어지기 위해서 유아교사에게 Pre-coding 활동에 대한 구체적인 정보와 실제 Pre-coding 활동을 경험할 수 있는 현직교사 교육 프로그램을 제공해야 함을 시사한다. The purpose of this study was to investigate the concerns of early childhood teachers in regard to pre-coding activities by applying the concern-based adoption model (CBAM) proposed by Hall and Hord (2006). A total of 300 teachers working at kindergartens and childcare centers participated in the study and answered CBAM Questionnaires. The data was converted using the SoCQ scoring device and was expressed according to the SoCQ profile. T-test and one-way ANOVA were conducted to verify the differences between the stages of concern according to the participants’ backgrounds. The results showed that stage 0 (awareness) had the highest level of concern, and the stage 4 (consequence) had the lowest level of concern. This result indicated that the participants’ level of use (LoU) was a nonusers’ pattern which meant that the participants had little or no knowledge of pre-coding activities. There were no statistically significant differences in the stages of concern depending on the types of early childhood institution, work experience, academic background, and children’s age of responsibility. However, there was significant difference in the stage 6 (refocusing) depending on the participation of in-service education about pre-coding. Also, there were significant differences in all stages except stage 3 (management) depending on the understanding regarding pre-coding activities. Based on the results, this study proposed that specific information about pre-coding activities and opportunities to experience actual pre-coding activities should be provided in the pre-service teacher education as well as in-service teacher education programs in order to implement pre-coding activities at pre-school level successfully.
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.
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.