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.

오지호 <남향집> 제작연도에 관한 실증적 연구

오병희(Oh Byung hee) 한국조형디자인학회 2017 조형디자인연구 Vol.20 No.2

South Facing House is considered a seminal work by Oh Ji-ho who works in a kind of Korean-style Impressionism based on Korean nature. This painting features Sarangchae, a detached building of a residence used as a reception room for male guests, and a jujube tree in Chodangjip in Gaeseong where Oh resided from 1935 to 1944. This residence has been designated as a registered cultural property. This study raises an objection to an assertion that South Facing House was painted and complemented in 1947 or in the late 1960s. This study has verified that this work is a modern artwork painted in 1939 on the basis of literature, archived materials, and survey reports. It has also tried to elucidate the season and time of this painting and the girl appearing in this work based on the description of South Facing House that was on show at Oh’s 1948 solo exhibition under the title The Declining Sun. This has also verified the assertion that this work was not painted after Korea’s liberation from Japanese colonial rule. First of all, it has been proved that the setting of furniture and house hold items in South Facing House matches up with that of the photograph featuring Chodangjip through a comparative analysis on the basis of the bereaved family’s testimony. As to the assertion that South Facing House is a depiction of Oh’s house in Dongbok, Hwasoon, Jeonnam, this study provides evidence that the that thatched-roof house in South Facing House could not have been painted from the roof-tiled house in Dongbok. It has also proved its opposition against the assertion that this work was produced after liberation in consideration of its preservation and material, based on an essay by Kim Eun-soo who assisted at Oh’s 1948 solo exhibition. This study has revealed that the possibility of this work being repainted or reproduced by Oh after liberation is extremely low based on the materials of 27 pieces which the National Museum of Modern and Contemporary Art, Korea scientifically analyzed. A reasonable evaluation of Oh Ji-ho s Korean-style impressionism and his work South Facing House can be made through an analysis of the production period and materials.

온라인 미디어를 통한 문화예술교육의 방향성 : 오레지나무용단의 Dancing life, Happy up!을 중심으로

오세준(Oh, Saejoon) 한국문화예술교육학회 2021 모드니 예술 Vol.18 No.-

This article examines the characteristics of the recommendable directions for Munhwayesul kyoyuk (Cultural Arts Education) that Oh-Regina Dance Company (a.k.a. Ore Dance) realized through its YouTube production, Dancing life, Happy up! Through its production of Dancing life, Happy up!, Oh-Regina Dance Company showed the ways that make non-contact Munhwayesul kyoyuk successful. Since COVID-19 forced the world to find new ways to meet the problems caused by the pandemic, using the online media has been the most important matter for the people in the arts-field. The Oh-Regina Dance Company with its Dancing life, Happy up! shows a couple of the desirable directions for Munhwayesul kyoyuk in Korea. One of the directions to which Munhwayesul kyoyuk shoud go is that artistic experience should be realized through an active physical performance of the students. At the same time, such an experience should be in a form of a physical practice or a team project that pursues problem-solving. The other characteristic of the desirable direction for Munhwayesul kyoyuk is that building a community should be aimed through the online media. According to Oh-Regina Dance Company’s achievements, various levels of communities can be made through utilizing the onlime media. The “community” can be constructed between the members of family, friends, or performer and the viewer. When a Munhwayesul kyoyuk (Cultural Arts Education) program is done “on-line,” the most important question should be if the program have same effects and identity with a program done “off-line.” Oh-Regina Dance Company with its production Dancing life, Happy up! proves that the same effects and the identity of Munhwayesul kyoyuk can be realized when Munhwayesul kyoyuk is done through the online media.

메탄/공기 층류 부분예혼합화염의 상세 라디칼(OH*, CH* 그리고 C₂*) 정보와 배기매출물에 관한 실험적 연구

정용기,오정석,전충환,장영준,Jeong Yong Ki,Oh Jeong Seog,Jeon Chung Hwan,Chang Young June 대한기계학회 2005 大韓機械學會論文集B Vol.29 No.2

An experimental study was performed to investigate the effects of partially premixing, varying the equivalence ratios from $0.79{\sim}{\infty}$, on NOx emissions and chemiluminescence of excited $OH^{\ast},\;CH^{ast}\;C_2^{\ast}$ radicals in laminar partially premixed flames. the signal from the electronically excited state of $OH^{\ast},\;CH^{ast}\;C_2^{\ast}$ was detected through a band pass filter with a photo multiplier tube, which are processed to the intensity ratio ($C_2^{\ast}/CH^{\ast},\;C_2^{\ast}/OH^{\ast},\;and\;CH^{\ast}/OH^{\ast}$) to reveal the correlation with local equivalence ratio. And measurements of NOx emission were made to investigate the relationship between visible flame appearance, chemiluminescence, and EINOX. The results demonstrated that (1) the flames at ${\phi}<1.59$ exhibited classical double flame structure, at ${\phi}>4.76$, the flames exhibited diffusion flame structure, and the intermediate flames at $1.59<{\phi}<4.76$ was a merged flame, (2) the $OH^{\ast}$ peak was located inside the $CH^{\ast}\;and\;C_2^{\ast}$ radical for all measured conditions and the emission intensity ratio of $C_2^{\ast}/CH^{\ast}\;and\;C_2^{\ast}/OH^{\ast}$ were identified as good marker for local equivalence ratio over a range of ${\phi}=0.79{\sim}1.2\;and\;CH^{\ast}/OH^{\ast}\;is\;0.79<{\phi}<1.9$. However, it was difficult to predict the equivalence ratio in partially premixed flames using this system for ${\phi}>2.38$, (3) the minimum NOX emission index (EINOx) is obtained for a equivalence ratio of 3.19 in the intermediate flames.

Effects of Inorganic Aerosols on the Gas-Phase Reactions of the Hydroxyl Radical with Selected Aliphatic Alkanes

Oh, Sewon,Andino, Jean M. 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.E3

Effects of inorganic. aerosols on the kinetics of the hydroxyl radical reactions with selected aliphatic alkanes have been investigated using the relative rate technique. The relative rates in the absence and presence of aerosols were determined for n-butane, n-pentane, n-hexane, n-octane, and n-decane. P-xylene was used as a reference compound. Inorganic aerosols including (NH₄)S0₄. NH₄NO₃, and NaCI aerosols at two different aerosol concentrations that are typical of polluted urban conditions were tested. Total surface areas of aerosols were 1400 (Condition I) and 3400㎛²cm (Condition II). Significant changes in the relative rates in the presence of the inorganic aerosols were not observed for the n-butane/· OH, n-pentane/·OH, n-hexane/·OH. n-octane/·OH, and n-decane/·OH reactions versus p-xylene/·OH reaction. These results suggest that the promoting effects depend on the semiconducting property of the aerosols and the nature of the organic compounds.

Combustion characteristics of gaseous inverse O₂/H₂ coaxial jet flames in a single-element model combustor

Kim, Tae Young,Choi, Sun,Kim, Young Hoo,Ahn, Yeong Jong,Kim, Hee Kyung,Kwon, Oh Chae Elsevier 2018 ENERGY Vol.155 No.-

<P><B>Abstract</B></P> <P>To effectively design hydrogen (H<SUB>2</SUB>)/oxygen (O<SUB>2</SUB>) liquid rocket engines through understanding the combustion characteristics of H<SUB>2</SUB>/O<SUB>2</SUB> bipropellants, fundamental studies for the bipropellants in different phases are needed. This study is focused on the combustion characteristics of inverse gaseous O<SUB>2</SUB>/H<SUB>2</SUB> coaxial jet flames in a single-element model combustor as a preliminary step for succeeding studies of injection at different phases in the combustor, visualizing flame structure by direct imaging, OH<SUP>∗</SUP> chemiluminescence and OH planar laser-induced fluorescence. With increasing Reynolds number (Re), the frequency of occurrence of the local flame extinction increases and the length of the disconnected OH reaction zone is extended. The OH layer thickness increases downstream, while it is almost constant where the local flame extinction occurs and decreases with increasing Re due to the enhanced strain and scalar-dissipation rates. The excessive flame wrinkledness increases the local flame strain rate and results in the local flame extinction, exhibiting the tendency of increasing and then decreasing flame surface density with increasing Re. The probability density function of OH intensity quantifies the fluctuation intensity of OH radicals and the possibility of the local flame extinction. A useful database is provided for modeling the combustion of H<SUB>2</SUB>/O<SUB>2</SUB> bipropellants under different phases.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A useful database for modeling the H<SUB>2</SUB>/O<SUB>2</SUB> bipropellant combustion is provided. </LI> <LI> Local flame extinction frequently occurs at high Reynolds number (<I>Re</I>). </LI> <LI> OH probability density function indicates the possibility of local extinction. </LI> <LI> Flame surface density increases and then decreases with increasing <I>Re</I>. </LI> <LI> Strong burning of O<SUB>2</SUB>/H<SUB>2</SUB> causes laminar-like combustion near the injector lip. </LI> </UL> </P>

요구원 후기시의 탈원근법적 주체와 시각의 형이상학

오연경(Oh, Youn-kyung) 한국시학회 2013 한국시학연구 Vol.- No.36

The Kyuwon Oh’s later poems, so called a ‘raw image poetry’ are based on a new alternative visual regime as a challenge to the anthropocentric perspective regime. The post-anthropocentricism of Kyuwon Oh’s poems proceeds from a denial of signifying or naming subject and such a subject-centered language. So the raw image poetry cannot but make into question not only a notion sticked to a language but also a notion sticked to a view. In this question, the main issue is a perspective hypothesis which establish a basis of subjectivity and rationality in anthropocentricism. Thus the raw image suggested by Kyuwon Oh is not a phenomenon of things in the raw, but an alternative hypothesis, that is a language of post-perspective vision against the conventionalized hypothesis sticked to things, This paper examines in reference to the post-perspective vision, the methodology of the raw image poetry which aims to make a language in contact to phenomenon of things by an innovation of perception. Therefore this paper would demonstrate that the keys to methodology of the raw image poetry are the post-perspective vision by analyzing in detail three points of writing poetry, ⑴ to make an another visual notion by eliminating a perspective depth, ⑵ to rearrange a routine visibility by reversing the principles of forms and backgrounds, ⑶ to create a metaphysical vision by realizing a frame-internal subject. It brings us a new ability of vision to see the things which are assigned to the invisible. The new ability of vision provides a ‘metaphysics of vision’ which visualizes a metaphysical longing for infinities of the world. The metaphysics of vision is considered as a kind of artistic utopia to overcome a problematic modernity in the society of fetishism. The raw image poetics of Kyuwon Oh can be appreciated in terms of a denial of perspective regime which establish a basis of subjectivity and rationality and a creation of metaphysical vision as counterplans for the perspective regime.

정적 연소기내 혼합기 농도변화에 따른 OH분포 측정

최동석(D.S.Choi),김덕줄(D.J.Kim),오승묵(S.M.Oh),황의상(E.S.Hwang),정용일(Y.I.Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2

The OH molecule is a highly reactive combustion intermediate and relatively abundant in combustion systems. It also has the availability of convenient UV -laser systems to excite the A²Σ-X²?? electronic transition. The spectroscopic parameters describing this transition are well known. In this research, the OH molecule was measured in the laminar flame burner and constant volume combustion chamber(CVCC) in order to use it as the fundamental data for studying combustion phenomena. The LIF images of the OH molecule in the laminar 리ame burner were caught by using KrF excimer laser and ICCD camera. The natural fluorescence<br/> of OH was also measured by the interference filter(310 nm) and spectrometer in the CVCC at different equivalence ratios.

메탄 공기 층류 부분 예혼합화염에서 예혼합 정도에 따른 화염구조와 질소산화물의 배출에 미치는 영향에 관한 연구

오정석(Jeong Seog Oh),정용기(Yong Ki Jeong),전층환(Chung Hwan Jeon),장영준(Young June Chang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11

It is shown that the effect of variable parameters on flame structures and NOx emissions in the laminar<br/> partially premixed methane-air flames with a co-axial Bunsen burner. Objectives of this paper is to<br/> understand the effects of flow variables on NOx emissions and the flame structure with OH<br/> chemiluminescence, including reconstructed image by abel inversion processing at each conditions. A fuel<br/> flowrate of 200 [cc/min] was fixed and the amount of air was varied from 400 to 1200 [cc/min]. The<br/> experimental variables were equivalence ratio( ), fuel split percentage( ) and inner tube recess(x/D). Flow<br/> conditions were ranged from 1.36~4.76(equivalence ratio), 50~100(fuel split percentage) and 0~20(inner<br/> tube recess). NOx analyzer and ICCD camera with a OH filter were used as a main experimental<br/> apparatus. In addition, Abel inversion, which is a kind of tomography and valuable to estimate a<br/> two-dimensional structure of co-axial flames from cubical information, was employed for combustion<br/> diagnostics. Results from this study indicate that the main effects depend on equivalence ratio and next<br/> sigma, x/D for NOx production and OH formation. Throughout Abel inversion, we could affirm the<br/> maximum position and the tendency of OH radical intensity by variants at five axial heights above the<br/> burner exit.

기우제의(祈雨祭儀)를 통해 본 영남 지방관의 일상과 대민의식

오용원 ( Yong Won Oh ) 경북대학교 영남문화연구원 2009 영남학 Vol.0 No.16

Through this article, I investigated how Youngnam reeves performed ritual for rain as a official business. To do this I focused on the rituals of Chaewon Oh Hoing-Mook (1834~?), who was reeve of Youngnam province. Oh`s ritual was official, but dynamic and flexible. In a aspect Oh`s ritual for rain was one of his routine jobs. In other aspect, through his ritual, Oh tried to establish social integration with consideration for the subjects. The ritual for rain was performed when drought kept going on. In this natural crisis. he held the ceremony to meet the subjects face by face. Through two additional ritual, especially, he preserved social order, and took care of the subjects preferentially. All social class people can also meet each other in the ritual. Performing the ritual with highly established form, he also gave great concern to the subjects. He gained sympathy of the subjects`s pain, and paid fruits or money. He also minimized the subjects`s burden loaded to them. In these his routine rituals, I can know that reeves shared their joy with the subjects and communicated each other. It is fundamental procedure to choose ritual place, to prepare things needed in the ceremony, and to write a ritual oration in the official ritual. It is common to prepare ritual place, things needed in ritual, and order of ritual according to law books. The ritual was based on Conficianism, therefore taboos or belief system of official ceremony was less restricted than those of private ceremony. One of remarkable thing is ritual oration. After 13th ritual, the two additional rituals was executed. In those rituals, the formality of orations were less strict than that of previous 13 rituals. He showed his wish for raining with the ritual oration, which had long sentences and flexible contents. Reeves usually understood the Mother Nature in aspect of Confucianism. Eventually, reeves recognized the relationship between God and human as a reciprocal interaction.