석영과 장석의 Zeta 전위에 있어서 금속이온의 영향

오재현,박광원,이원해,원덕환 대한금속재료학회(대한금속학회) 1974 대한금속·재료학회지 Vol.12 No.4

石英과 長石의 活性化에 關한 資料를 얻기 爲해서 水溶液中 Mg^(++), Cu^(++), Zn^(++)과 Al^(+++)를 添加하여 鑛粒의 Zeta 電位를 測定하였다. 그리고 이들 鑛粒의 界面電氣現象과 金屬이온들의 加水分解特性을 서로 關聯시켜 比較 檢討하여 다음과 같은 結論을 얻었다. 1. 水溶液中에 金屬이온이 存在할 때 長石의 界面電氣現象은 石英과 같다. 2. 金屬이온種의 吸着으로 因해 石英과 長石의 界面은 陽(+)으로 荷電된다. 그리고 陽으로 荷電되는 pH 範圍는 金屬이온의 種類에 따라 다르다. 3. 水溶液中에 金屬이온들이 存在하면 鑛粒의 zpc(Zero point of charge)는 두 곳의 pH에서 나타난다. 두개의 zpc 중 하나의 zpc가 나타나는 pH는 M^(II)OH^+, M^(III)(OH)^+_2 및 M^(III)(OH)^(++) 이온種의 最高濃度가 나타나는 pH와 거의 一致한다. 마그네슘 이온의 경우에는 pH 10.1에서 단하나의 zpc가 나타난다. 4. Mg(II), Cu(II), Zn(II) 및 Al(III) 이온들의 加水分解特性과 zeta 電位를 關聯시켜 볼 때 Mg^(++), Cu^(++), Zn^(++) 및 Al^(+++)은 鑛粒表面에 對해 吸着力이 弱하고, 한편 M^(II)(OH)^+, M^(III)(OH)^+_2 및 M^(III)(OH)^(++) 이온種은 吸着力이 强함을 알 수 있다. To obtain a better understanding of quartz and orthoclase activation, zeta potentials of the minerals were studied in the presence of metallic ions such as Mg^(++), Cu^(++), Zn^(++) and Al^(+++). A microelectrophoresis technique has been used to measure the zeta potential, and the results have been correlated with the hydrolysis of the metallic ions in the solution. The experimental results have led to the following conclusions. 1. Zeta potentials of orthoclase in the presence of the metallic ions show a similar behavior to those of quartz. 2. Adsorption of the metallic ions renders the zeta potential of quartz and orthoclase positive. The pH range of positive zeta potential varies with the kind of cation. 3. Zero point of charge(ZPC) of the mineral surface in the presence of metallic ions appears at two different pH of solution. One of two pH of ZPC is consistent with the pH at which M^(II)(OH)^+ and M^(III)(OH)^+_2 or M^(III)(OH)^(++) species are predominant. 4. Comparison of the zeta potential data with the hydrolysis for Mg(II), Cu(II), Zn(II) and Al(III) species suggests that Mg^(++), Cu^(++), Zn^(++) and Al^(+++) are only weakly adsorbed at the mineral surface and that M^(II)(OH)^+ and M^(III)(OH)^+_2 or M^(III)(OH)^(++) are the main metallic ionic species adsorbed.

분사법에 의한 탄산칼슘 제조

신보철,한상오,김주호,송지훈,송근호,이광래 강원대학교 석재복합신소재제품연구센터 2001 석재연 논문집 Vol.6 No.-

본 연구는 탄산가스화법에 의한 탄산칼슘 입자 제조 공정에 있어서, 탄산가스로 채워진 반응기에 수산화칼슘 슬러리를 분사하는 방법으로 탄산칼슘 입자를 제조하였다. 수산화 칼슘의 농도(0.25~1.0wt%), 분사압력(0.5kgf /㎠~1.5kgf /㎠) 및 반응기 온도(20℃, 28℃)의 변화에 따른 생성된 탄산칼슘을 관찰하였다. 수산화 칼슘의 농도가 비교적 높으면(0.75wt%, 1.0wt%), 생성물의 pH와 전도도는 높게 나타났다. 분사압력에 의한 탄산칼슘 제조의 변화는 분사압력이 높아질수록(1.5kgf /㎠), pH와 전도도는 높게 측정되었다. 그러나, 수산화 칼슘의 농도와 분사압력의 변화가 탄산칼슘의 입자크기, 형태, 결정구조에 영향을 미치지는 않았다. 반응기의 온도가 28℃에서 생성된 탄산칼슘은 1.0㎛이하의 칼사이트 상 입자가 제조되었으며, 20℃에서 생성된 탄산칼슘은 0.5㎛이하의 칼사이트 상 입자가 제조되었다. 반응기의 온도가 낮아질수록 탄산칼슘 입자의 크기가 작아짐을 알 수 있었다. For the preparation of calcium carbonate particles from aqueous Ca(OH)2 slurry, carbonation reaction of aqueous Ca(OH)2 slurry was carried out by spouting the aqueous slurry of Ca(OH)2 into reactor filled with CO2 gas. The concentration of Ca(OH)2 varies from 0.25wt% to 1.0wt%, nozzle pressure from 0.5kgf /㎠ to 1.5kgf /㎠, and reactor temperature were set at 20℃ and 28℃. With relatively high concentration of 0.75wt% and 1.0wt% of Ca(OH)2, pH and conductivity of product-stream were observed high value. High pH and conductivity were observed at high nozzle pressure of 1.5kgf /㎠. The concentration of Ca(OH)2 and nozzle pressure, however, did not change the particle size and shape of calcium carbonate synthesized by carbonation reaction. The reaction temperature affected particle size. At reactor temperatures of 28℃ and 20℃, the particle sizes were about 1.0㎛ and 0.5㎛, respectively. Crystal structure of calcium calcium carbonate was of calcite. When reactor temperature was lower, the size of calcium carbonate particle was smaller.

일반중학생의 통합체육에 대한 태도 연구

오광진,최승권,김기영 한국특수체육학회 2002 한국특수체육학회지 Vol.10 No.1

the purpose of this study was to examine the middle school students' attitude toward inclusive physical education of students with disabilities. Subjects for this study was middle school students of 7-9 grades living in Seoul, South Korea The sample number used in the analysis was 497. The questionnaire concerning the middle school students' attitudes toward inclusive physical education was developed by Kwang-Jin Oh(2001) who consisted of 6 factors, 26-item. The reliability of the questionnaire was confirmed based on the calculation of Chronbach's α value. Chronbach's α value was .8753. This study produced the following results. First, the middle school students' attitudes toward inclusive physical education of students with disabilities according to gender, grades, experience of inclusive education, having friends with disabilities, and experience of inclusive physical education had significant differences. Second, gender and start of inclusive physical education had negative effects on attitude toward inclusive physical education of students with disabilities. These findings reported the middle school students contacted with students with disabilities had negative attitudes toward inclusive physical education.

통합체육수업이 장애대학생과 일반대학생의 태도에 미치는 영향

오광진 한국특수체육학회 2005 한국특수체육학회지 Vol.13 No.1

The purpose of this study was to identify the effects of inclusive physical education lessons on attitudes of college students with and without disabilities. Subjects for this study were college students with and without disabilities participating in inclusive physical education lessons in H college which was built for inclusion education. The samples included 197 college students (students with disabilities = 87, students without disabilities = 110). The questionnaire concerning attitudes toward inclusive physical education was developed by Oh Kwang-Jin (2001b) which consisted of 6 factors, 26-item, 5 of socio-demographics variables, and 6 of background variables. Independent t-test, Paired t-test, and One-way ANOVA were used for data analyses, and the reliability was confirmed by Cronbach's a value. Cronbach's a value was .88. The results were as follows: First, there was no significant difference in attitude toward inclusive physical education between college students with and without disabilities at pre (after 3-week) and post (after 15-week) test points, however there was a significant difference in attitude toward inclusive physical education within each college students with and without disabilities. Second, first and second semester college students didn't have significant difference in attitude toward inclusive physical education. Third, previous experiences in inclusive education lessons had significant difference on attitudes toward inclusive physical education. Four, previous experiences in inclusive physical education lessons had significant difference on attitudes toward inclusive physical education. Fifth, understanding of disability traits made a significant difference in attitudes toward inclusive physical education. These results implied attitudes toward inclusive physical education of college students with and without disabilities will be changed more positively, if they participated in inclusive physical education lessons systematically during 12 weeks.

Thermoelectric Properties of Bi2Te3 Film Processed by Electrodeposition

Lee, Kwang-Yong,Oh, Tae-Sung Research Institute of Science and Technology HONGI 2005 Hongik Journal of Science and Technology Vol.9 No.-

Thermoelectric properties of the electrodeposited Bi_(2)Te_(3) films have been investigated. Bi_(2)Te_(3) plating solution of 20 mM concentration was prepared by dissolving Bi_(2)O_(3) and TeO_(2) into 1M HNO_(3). Thermoelectric properties of the electroplated Bi_(2)Te_(3) films were changed with the film thickness, and the 40 μm-thick film exhibited Seebeck coefficient of -66 μV/K, electrical resistivity of 2.4 mΩ-cm, and power factor of 1.75x10^(-4) W/K^(2)-m. Using multilayer overhang process, the photoresist pattern to form thermoelectric legs of 30 μm depth and 100 μm diameter was successfully fabricated.

회분식 반응기에서의 공정변수 변화에 의한 침강성 탄산칼슘 제조

신보철,한상오,김주호,송지훈,송근호,이광래 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B

For the preparation of calcium carbonate particles from aqueous Ca(OH)2 slurry, carbonation reaction of aqueous Ca(OH)2 slurry was carried out by batch method the CO2 into reactor filled with aqueous slurry of Ca(OH)2. The concentration of Ca(OH)2 varies from 1.00 to 7.00wt%, reactor temperature at 20 and 40℃, and reactor pressure from atmospheric pressure to 6.0kgf/cm2. Crystal structure of calcium carbonate was of calcite, the particle size were about 0.05 ∼2.0㎛, and the particle shape was cubic and spindle. When reactor temperature was higher, particle size of calcium carbonate was bigger and particle share was varied, but reaction rate was increased. When reactor pressure was higher, particle size of calcium carbonate was smaller, particle shape was cubic, and reaction ramie was increased.

무등산 도립공원의 등산로 이용현황과 등산로 선정요인

김상오,오광인 ( Sang Oh Kim,Kwang In Oh ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.2

Understanding of the reasons why users in recreation settings select particular trails may provide useful information for effective recreation resources management. This study investigated the present use of the major trails in Mudeung-san Provincial Park and the major influential factors on trail selection . This study was conducted in Mudeung-san Provincial Park stretching over Hwasun-gun and Damyang-gun of Chonnam Province and Kwang-ju city during August in 1996. Data were collected through on-site survey and mail-back questionnaire. 519(44.2%) out of 1173 survey samples were used for analysis. Reasons for selecting a particular trail were classified into 8 major factors. In overall, the order of the importance degree of the factors was 1) aesthetics of landscape, 2) safety(from physical and crime), 3) conditions for health, 4) quietness, 5) familiarity, 6) on the way to the destination, 7) convenience/social, 8) others` intention. There were differences in the degree of importance of each factor depending on trails, users` characteristics(eg., gender, age, group size, visit experience, etc.) and users` behavioral patterns. Recreation motivations were classified into 5 major factors. The order of the importance degree of the factors was 1) contacting with nature, 2) self-training, 3) solitude, 4) social interaction, 5) appreciating cultural properties. Regardless of trails, `contacting with nature` was the most important factor, and the degree of importance in the other 4 motivational factors showed only a little differences in order according to the trails. There were correlations between major factors for trail selection and recreation motivations. The results of this study may provide foundational information for establishing effective management strategies through better understanding of the present use of trails and influential factors on trail selection. It can be used for reducing the present social and ecological problems caused by use concentration on certain trails and providing users with better quality of diverse recreational experiences. This study discussed the findings, and suggested some management strategies based on these information.

pH, 이온종류 및 농도, 퇴적물의 성분에 따른 하천 내 불소의 거동특성

이동민(Dong Min LEE),주광진(Kwang Jin Joo),최이송(ISong Choi),장광현(Kwang Hyeon Chang),오종민(Jong Min Oh) 응용생태공학회 2018 Ecology and resilient infrastructure Vol.5 No.1

하천에 유입된 오염물질은 다양한 환경 조건에 의하여 수체 및 퇴적물의 상호작용에 따라 수체의 수질에 영향을 미친다. 특히 최근 수체의 수리학적 체류시간이 상대적으로 긴 정체수역 내에서는 퇴적물의 축적량이 증가하고 있어 퇴적물과 수체 내에서의 물질적 거동특성 파악은 중요한 수질적 관점 요소이다. 본 연구에서는 하천 내 pH, 이온종류 및 농도, 퇴적물의 점토함량에 따라 불소의 거동이 어떻게 변화하는지 검토하기 위하여 경기도에 위치한 중소하천을 대상으로 조건별 실험을 실시하였다. pH에 따른 흡착 및 용출특성 실험결과, pH가 높을수록 불소의 흡착량이 감소하였고, 용출되는 불소량은 증가하는 경향을 나타냈다. 이온농도 및 종류에 따른 흡착 및 용출특성 실험결과, Cl<SUP>-</SUP>, SO₄<SUP>2-</SUP> 이온은 불소의 흡착능에 큰 영향을 주지 않는 것으로 나타났으나, 불소와의 활발한 이온경쟁효과를 지닌 OH<SUP>-</SUP>와의 반응에서는 흡착량이 줄고, 용출량이 늘었음을 알 수 있었다. 퇴적물의 성분에 따른 흡착 및 용출특성 실험 결과 상대적으로 입경이 작은 Silt와 Clay 성분이 많이 포함된 시료에서 불소의 흡착량이 많고 용출되는 불소량이 줄어드는 것을 알 수 있었다. 이는 수체의 환경조건이 퇴적물 내 불소의 흡착 및 용출에 크게 영향을 미치기 때문에, 퇴적물 내 불소를 적절하게 관리하기 위해서는 수체의 환경조건에 대한 이해가 선행되어야 한다는 것을 의미한다. Water quality is affected by the pollutants flowing into rivers since the interaction between water bodies and sediments in various environmental conditions. Especially, accumulation of sediments increases in the stagnant water areas due to a relative long hydrological retention time in the water bodies. Therefore, it is an important factor of water quality to understand characterization of the material behavior in water bodies and sediments. In this study, the objective of the conditional experiments was small and medium sized streams located in Gyeonggi-do. To estimate how the changes of fluoride behavior, depending on the pH, ion type, concentration, and clay contents. The pH results showed a trend that adsorption amount of fluorine decreased and the dissolution of fluorine increased following by pH increasing. The concentration and type of ions results showed that Cl<SUP>-</SUP> and SO₄<SUP>2-</SUP> ions had no significant effect on the adsorption ability of fluorine, the amount of dissolution was increased because OH<SUP>-</SUP> ion had active competition with fluorine in the reaction. The ingredient of sediment results showed that the amounts of fluoride adsorption and dissolution were reduced in samples, which contain relatively large amounts of Silt and Clay components. This means that the environmental conditions of water bodies greatly affect the adsorption and dissolution of fluoride in the sediments, so that proper management of fluoride in the sediments must precede an understanding of the environmental conditions of the water bodies.

EAF Slag의 해양복토제 활용을 위한 PO₄<SUP>­</SUP>-P 제거특성에 관한 연구

김재원(Jae-Won Kim),서종범(Jong-Beom Seo),강민경(Min-Gyeong Kang),김인득(In-Deuk Kim),오광중(Kwang-Joong Oh) 한국청정기술학회 2010 청정기술 Vol.16 No.4

본 연구에서는 제강전기로 슬래그를 해양복토제로 활용하기 위한 인제거 특성실험을 실시하였다. 제강전기로 슬래그의 PO₄<SUP>-</SUP>-P 제거 특성에 관한 시험 결과, 슬래그 내의 CaO는 Ca<SUP>2+</SUP>와 OH<SUP>-</SUP>로 이온화됨에 따라 PO₄<SUP>-</SUP>-P와 반응하여 HAP를 형성함으로써 용액 중에 존재하는 PO₄<SUP>-</SUP>-P를 효과적으로 제거하는 것으로 나타났다. 연속반응기를 통한 해수 내 PO₄<SUP>-</SUP>-P의 지속적인 유입에 대한 제거특성을 확인한 결과, 칼럼 내 PO₄<SUP>-</SUP>-P 농도는 반응 3일 이후 급격히 감소하여 10일 이후에는 0.5 ppm 이하로 나타났다. 실제 연안해역의 저질을 이용한 제강전기로 해양복토제 적용실험 결과, 반응 25일 후 PO₄<SUP>-</SUP>-P 발생량을 93∼ 98% 저감시키는 것으로 나타났다. 이러한 결과를 바탕으로 제강전기로 슬래그를 해양복토제로 활용할 경우 PO₄<SUP>-</SUP>-P 제거 및 억제효과가 있으며, 파쇄선별 등 별도의 추가공정 없이 적은 량으로도 사용 가능할 것으로 판단된다. This study estimated the possibility of phosphate removal characteristics to utilize EAF(electric arc furnace) slag as submarine cover material. The major phosphate removal mechanism was a certain formation of HAP precipitation occurred by the ionization reaction between Ca<SUP>2+</SUP> and OH<SUP>-</SUP>, which were leached from the EAF Slag. Another phosphate removal mechanism was the adsortion of EAF slag surface. As a result of PO₄<SUP>-</SUP>-P removal characteristics using continuous column reactor, PO₄<SUP>-</SUP>-P concentration decreased rapidly after 3 days and 10 days later, it show under 0.5 ppm. The result as applied in real sea water, shows that the phosphate removal effects were 93∼98% by the subaqueous sediment removal using the EAF slag. In conclusion, EAF slag is useful in PO₄<SUP>-</SUP>-P removal and control and it is possible to use without additional process like crush and selection.

알칼리 처리에 의한 폴리에스테르 필름의 강도 및 염색성의 변화

오정숙,이광주,전정희 효성여자대학교 가정대학 학도호국단 1985 家政大論集 Vol.4 No.-

When polester fibers are hydrolyxed in alkaline solution, they dissolve successively from their surface and change their dyeability. We examined the weight loss ofpolyester films treated with NaOH solution under various conditions and the equilibrium.amount of disperse dyes absorbed in films. An uptake of dyes on films treated withan alkaline solution has beer discussed in relat'on to the changes of weight loss of films. The changes of weight loss increased linearly on hydrolyzing time because ofdissolving uniformly froml their surface of films. However. in high concentrations ofalkaline solution, the changes of weight loss increased drastically owing to OH-attackedto the inner regions of films. The tensile strength of hydrolysed films decreased a sodden drop when the weightloss were low. But it decreased gently when weight loss were high. The dye uptake of hydrolyzed films increased a very small amount below 20% ofweight loss. However, it increased remarkably above 20% of weight loss.