고농도 니켈 침출액으로부터 Na-PC88A에 의한 Co, Mn 및 Zn의 분리에 관한 연구

安鍾寬,朴慶鎬,孫廷秀,안재우 대한금속재료학회 2001 대한금속·재료학회지 Vol.39 No.12

Solvent extraction experiments for the separation of impurities from Ni-rich solution were carried out for manufacturing of high purity Ni compounds from acid leaching solution of spent Ni-Cd secondary battery. Synthesised and actual leaching solution were used as aqueous phases and PC88A saponified by sodium in kerosene were used as organic phases. The extraction order is Zn>Mn>Co>Ni and extraction percentage of metal ions was increased with an increase of the concentration of extractant, initial pH of aqueous phase and ratio of O/A The separation of Ni and other impurities was effectively accomplished at the condition of extraction stage = 1, O/A = 1, saponified percent 50%, initial pH 5.0, concentration of extractant 1.0M.

Nickel 및 Cobalt가 함유된 염산용액중에서 Alamine336에 의한 Fe, Mn 및 Zn의 분리

안재우,안종관,박경호,손정수 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.6

The separation and recovery of cobalt and nickel from hydrochloric leaching solutions of manganese nodules were imitated by solvent extraction using Alamine336 in Xylene. The behavior of impurities such as iron, zinc, copper and manganese was also investigated. With the increase of chloride ion concentration, cobalt was selectively extracted from nickel owing to the difference of chlorocomplex in solution and the minimum chloride ion was 5.0M. But in this extraction step, the impurity metals such as copper, iron, manganese, zinc were also co extracted in the organic phase. However, co-extracted metals in the organic phase could be effectively separated in the scrubbing and stripping step. Manganese and nickel were effectively removed in the scrubbing step with 6.0M hydrochloric solutions but copper, iron and zinc were loaded in the organic phase with cobalt. Finally, the metal-bearing organic phase was contacted with the hydrochloric strip solution to recover the loaded cobalt. The impurity metals were effectively removed in this step with controlling the concentration of chloride ions in the strip solution. From the experiment, The behaviors of impurities on each of operation steps in extraction, scrubbing and stripping processes were investigated. Consequently the optimum condition for the separation of cobalt from hydrochloric solution were proposed.

화상으로 인한 소구증 환자의 치험례

지재휴,이병준,김영균,김수관,황경곤,여환호,박인순 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.3

Deep burns of the face & lips often lead to scarring and contraction of the circum-oral tissues with a marked reduction in the size of the oral aperture. Such burns most commonly caused by electrical contact, for example, children sucking electric plugs, or as a result of chemical burns and the exposture to flame. Once having burns, burned tissue may contract and reduce considerably the size and mobility of the mouth ; therefore bring up the resultant functional disturbance, verbal difficulty, even disgestive difficulty, and poor appearance, which fall into difficulty in social acceptability, caused by burns. In our department, 2 patients who were complain of functional limitations and esthetic problem owing to scar contracture, were visited, and we treated this microstomia with scar excision, graft and flap technique, and postoperative intensive physical therapy. We obtained relatively favorable results, thus report this cases with literature review.

허혈심근에서의 퓨린성 및 콜린성 작동제의 심근보호 작용

김재하,박상덕,주정민,국현,조정관,박옥규 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.7

이차구순열 결손의 치료

임석균,박인순,여환호,지재휴,김영균,김수관 大韓顎顔面成形再建外科學會 1997 Maxillofacial Plastic Reconstructive Surgery Vol.19 No.2

Despite the current accomplishments with the repair of cleft lips, the surgical management of the nasal deformity remains a functional and aesthetic dilemma for patients, their families, and reconstructive surgeons. Recent improvements in the understanding and technical execution of te primary cleft lip repair have significantly reduced secondary sequelae and the consequent need for secondary surgical correction. But, secondary surgical corrections are necessary according to numerous factors. Such factors include the secondary surgical corrections are necessary according to numerous factors. Such factors include the severity of the initial deformity, the surgical plan, precision of execution of the primary repair, and success of the postoperative management. We preformed the secondary correction of cleft lip and palate in 11 patients via various methods. In conclusion, primary repair of cleft lip and palate patients is the most important to prevent the secondary deformities, and most of cleft lip and palate with secondary deformities must be treated with combined cheiloplasty and rhinoplasty.

연속식 오존처리공정을 이용한 낙동강 상수원수의 정수처리 효과

임영성,강관호,이홍재,서동철,박문수,허종수,조주식 한국환경농학회 2002 한국환경농학회지 Vol.21 No.3

낙동강 상수원수를 대상으로 연속적 오존처리에서 오존주업농도에 따른 유기물 분해 특성을 조사하기 위하여 오존처리에 의한 DOC성분변화, UV254/DOC의 변화와 소비오존에 따른 DOC 제거효율을 조사한 결과는 다음과 같다. 유입원수의 수질변화에 따라 다소 차이는 있었으나 전반적으로 오존주입농도가 증가할수록 DOC 처리효율도 증가되었다. 오존처리에 따른 DOC 성분변화는 전오존을 3 mg/L농도로 처리시 TDOC, ADOC, A&BDOC 및 NRDOC는 각각0.6, 0.2, 0.1 및 1.0 mg/L 정도 오존처리에 의하여 감소되었으나 BDOC는 0.8 mg/L 증가하였다. UV254/DOC의 분율은 오존주입농도를 1, 3 및 5 mg/L 처리하였을 때 전오존의 경우는 각각 0.048, 0.044 및 0.037 이였고, 후오존의 경우는 각각 0.018, 0.015 및 0.012로 나타나 오존주입농도가 증가할수록 감소하는 경향을 보였다. 초기 DOC mg당 소비되는 오존량에 대한 DOC 제거율은 전오존과 후오존처리의 초기 DOC에 대한 소비오존량이 각각 약 1.5와 2.3일 때 각자 25%와 32%로서 최대의 DOC 처리효율을 나타내었다. 낙동강 상수원수에 전오존을 처리할 경우 오존주입량은 초기 DOC mg당 소비된 오존이 1.5 mg 이내의 농도가 되도록 주입하고, 후오존은 유입수인 모래여과수의 초기 DOC mg당 소비된 오존이 2.3 mg이내의 농도가 되도록 조절하여 주입하면 적당할 것으로 생각되었다. This study was carried out to evaluate the pollutant removal efficiencies of the advanced drinking water treatment using ozonation process. For raw water. Nakdong River was used. By conducting continuous ozonation experiments, the following results were obtained. Efficiency of water treatment was enhanced with increase in ozone dosage. When ozone dosage of 3 mg/L was used, preozonation of raw water reduced TDOC, ADOC, A&BDOC and NRDOC as much as 0.6 mg/L, 0.2 mg/L, 0.1 mg/L and 1.0 mg/L, respectively. On the other hand, content of BDOC Increased at the level of 0.8 mg/L. Ratio of UV254 absorbance to DOC content by the preozonation with 1, 3 and 5 mg/L dosage were 0.048, 0.044 and 0.037, respectively. In case of postozonation, it were 0.018, 0.015 and 0.012, respectively. When the ratios of consumpted ozone content to 1 mg of initial DOC were 1.5 and 2.3 in preozonation and postozonation treatment, respectively, the highest DOC removal rates of 25% and 32% were obtained by the continuous ozonation.

葉成分과 土壤의 理化學的性質이 林木生長에 미치는 영향

李光洙,鄭永觀,朴南昌,崔載彩,姜眞擇 경상대학교 농과대학 부속연습림 2001 演習林硏究報告 Vol.- No.11

This study was carried out to analyze physical and chemical properties of soil and leaf analysis to estimating amount of tree growth in Chamaecyparis pisifera, Jinhae city, Gyeongnam province. The results were summarize as follows; As the results from analysis of relation of physical-chemical properties of soil and leaf component, the relationship p component inside soil and n component inside leaf showed positive correlation with determination coefficients(R^2=0.9986), and also relation of nitrogen component inside soil and component of Na_2O inside leaf showed positive correlation with determination coefficients(R^2=0.9987), but the relation of component Ca^2+ inside soil and component of Na_2O inside leaf showed negative correlation with determination coefficients(R^2=-0.9984), and also relation of p component inside soil and Fe component inside leaf showed negative correlation with determination coefficients(R^2=-0.7215). The results from analysis of relation of leaf component and tree growth, showed correlation of determination coefficient(R^2=0.4256) in height growth, determination coefficient (R^2=0.6248) in DBH growth, determination coefficient(R^2=0.6248,) in volume growth, respectively. In each tree growth of recent five years, N and P components showed positive correlation of determination coefficient(R^2=0.6170, 0.5780, respectively) in height growth, and also N and Na^+ components showed positive correlation of determination coefficient(R^2=0.6016, R^2=0.8727, respectively) in DBH growth, but K= component showed negative correlation in DBH growth As the results from analysis of stepwise regression to estimating amount of DBH growth, sequence of inputted variables entered in order of N, Na+, Mg++, ,and estimated equation was Y=44.791N-56.640Mg+0.6867Na-26.47, determination coefficients of 69%.

백금과 세리아를 담지한 촉매의 포름알데히드 산화반응에 관한 연구

김영철,김재승,박남국,김재관,신재순 全南大學校 觸媒硏究所 1996 觸媒硏究 論文集 Vol.18 No.-

Total oxidation of formaldehyde was studied using platinum and platinum-ceria catalysts supported on γ- alumina. Catalysts were prepared by coimpregnation with γ- Al₂O₃, Platinum and ceria loading were controlled as 0.02∼0.04wt% and 0.3∼7.6wt%, respectively. The characterization of the catalysts were investigated by catalytic activity, O₂-TPD and H₂-TPR. The order of catalytic activities in view of formaldehyde conversion was as follows ; Pt+Ce(0.3%)/Al₂O₃>Pt+Ce(0.8%)/Al₂O₃>Pt+Ce(5%)/Al₂O₃>Pt+Ce(7.6%)/Al₂O₃>Pt/Al₂O₃. Small amount of added ceria enhanced the catalytic activity. However, as the amount of ceria increased the activity was decreased. Optimum loading of ceria seems to be 0.3∼0.8w%.

효율적인 군 전직지원체제 정립 방안

정철영,고재관,황원채,윤희철,박가열,김재호,이성식,김동승,표성일,이건남,양안나,최수정,김은석 한국직업능력개발원 2008 직업능력개발연구 Vol.11 No.1

이 연구의 목적은 제대군인에 대한 효율적인 전직지원을 위해서 현행 전직지원 프로세스에 대한 개선 안과 이에 따른 국방부, 국가보훈처 등 제대군인 전직지원관련 기관 간의 역할분담 및 연계방안에 대해서 제안하는 것이다. 연구는 크게 세 가지 과정을 거쳤다. 첫째, 국내 군 전직지원 실태를 분석하여 문제점과 시사점을 도출하였다. 둘째, 이러한 문제점과 시사점, 군 전직지원 선행연구를 종합하여 효율적인 군 전직지원 프로세스 안을 제시하였다. 셋째, 구축한 군 전직지원 프로세스 안에 따라 주요 군 전직지원 관련 기관인 국방부, 국가보훈처의 역할 분담 안을 제안하였다. This study aims to suggest an improvement plan for the support process of effective occupation change for discharged soldiers and then role assignments among related institutions for supporting discharged soldiers such as Ministry of Defense, Ministry of Patriots and Veterans Affairs, Ministry of Labor and the cooperation plan among the institutions. The study was made in three steps. First, after analyzing currents support facts and status for discharged soldiers, it induced its problems and implications. Second, integrating the findings of previous studies related to support plan on occupation changes for the discharged soldiers, Problems and implications mentioned above, it constructed effective occupation change process for discharged soldiers. Then, according to the established process, it suggested role assignments such as Ministry of Defense, Ministry of Patriots and Veterans Affairs, Ministry of Labor.

최대하 운동부하검사가 노인 허혈성 뇌졸중환자의 혈관탄성·운동유발성 고혈압 및 허혈성 심장질환진단에 미치는 영향 : 사례연구

강동연,차재관,허재택,박정준,양점홍 釜山大學校 附設 體育科學硏究所 2009 體育科學硏究所 論文集 Vol.25 No.2

Purpose: The purpose of this study was to observe the blood pressure response during exercise test and to investigate baPWV and ABI and potentiality of the cardiovascular disease of three ischemic stroke elderly in submaximal exercise test. Method: It measured the blood pressure, ECG during submaximal exercise test and baPWV, ABI before and after exercise test. Results: It discovered low blood vessel elasticity, exercise induced hypertension, ST segment depression ≥ 1 mm through exercise test. Conclusion: Exercise test have a diagnosis valuable to decide a cardiac disorders. Moreover, It increases a sensibility of baPWV and ABI test and heighten a reliability of potential diagnosis of high blood pressure by submaximal exercise test. 뇌졸중(stroke)은 가령(加齡)과 함께 증가하며 크게 허혈성과 출혈성 형태로 니누고 근래에는 허혈성 뇌졸중의 발생빈도가 증가하고 있는 추세로 뇌졸중 환자의 혈류역학에 대한 연구는 순환기학 분야에서 뿐만 아니라 운동이 고혈압의 주요 개선 중재방법의 하나라는 관점에서 운동처방 분야에서도 심도 있는 연구가 요구된다. 그러므로 이 연구에서는 60세 이상의 허혈성 뇌졸중환자 3명에게 최대하 운동부하검사를 실시하여 각각의 사례에서 안정시에는 발견되지 않았던 혈관폐색의 높은 가능성, 운동유발성 고혈압 및 허혈성 심장질환의 정후인 ST분절≥1.0 mm 하강을 발견하였다. 이러한 점에서 운동부하검사는 심장질환을 판단하는 진단적 가치뿐만 아니라 baPWV와 ABI검사의 민감성을 증가시키며 고혈압 잠재성 진단에 유용하게 활용될 수 있다.