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

'스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

<남향집>은 1930년대에 한국의 자연에 바탕을 둔 한국적 인상주의의 완성한 오지호의 대표작이다. 그리고 <남향집>은 오지호가 1935년부터 1944년까지 거주했던 개성 초당집의 사랑채와 앞뜰의 대추나무를 그린 작품으로 등록문화재로 지정되어 있다. 본 연구는 <남향집>이 1947년경 제작되고 1960년대 후반에 제작되거나 보필되었다는 연구에 관해 반론을 제시하였다. 각종 문헌과 아카이브 자료, 보고서를 근거로 <남향집>이 1939년 빛을 바탕으로 한국인의 정서를 담아 그린 근대미술작품임을 증명하였다. 또한 1948년 오지호 개인전에 사양(斜陽, 25호)으로 출품된 <남향집>에 관한 오지호의 작품 설명을 분석하여 작품을 제작한 계절과 시간, 작품 속 소녀에 관해 밝혀보았다. 이러한 연구를 통해 <남향집>이 1947년경 제작되고 1960년대 후반 재제작되었다는 주장에 대한 반증으로 작품에 대한 사실을 밝혀 보고자 하였다. 먼저 <남향집>이 일제강점기 개성 초당집 사진의 구도, 기물 등과 일치하지 않다는 주장에 관해 개성집 초당집 사진과 <남향집> 작품을 유족의 증언을 토대로 비교․분석하여 일치함을 증명하였다. 그리고 <남향집>의 소재가 전남 화순 동복의 오지호집이라는 주장에 대해 오지호 동복집은 기와집으로 기와집을 초가집으로 바꾸어 <남향집>을 그릴 수 없다는 근거를 제시하였다. 보존상태가 양호하여 해방 후 재제작 되었다거나 앞, 뒷면이 달라 보필하였다는 주장에 대해 1948년 오지호 개인전을 도운 김은수의 회상의 글을 근거로 당시 개성시기 현존하는 작품이 완벽한 상태였으며 1955년 오지호가 목조로 지은 작품 친화적인 오지호 화실을 통해 반증하였다. 그리고 국립현대미술관에서 2008년 오지호 작품 27점을 과학적 분석한 자료를 토대로 해방 후에 오지호가 작품을 덧칠하거나 재제작 했을 가능성이 희박함을 밝혔다. 본 연구의 <남향집>의 제작시기, 재료분석, 작품분석을 통해 한국적 인상주의를 완성한 오지호와 <남향집>에 관해 정당한 평가를 받을 수 있을 것이다. 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.

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.

레이저유도형광법을 이용한 연소장에서 OH라디칼 계측

오승묵(S.M.Oh),황의상(E.S.Hwang),정용일(YJ.Jeong),최동석(D.S.Choi),김덕줄(D.J.Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2

Tunable KrF excimer laser is used to measure OH moleclule in the steady state flame. Laser induced predissociative fluorescence(LIPF) method which is not sensitive to collisional quenching is applied. The fluorescence spectrum is obtained by exciting 02(11) line in theA²Σ(v' = 3)- X²Ⅱ( v" = 0) transit <br/> 'n and 2 dimensional images are also measured by ICCD camera. The fluorescence images show OH radicals diffuse out both sides of flame fronts and at higher mixture velocities they have narrow distribution.<br/>

기획논문 : 기우제의(祈雨祭儀)를 통해 본 영남 지방관의 일상과 대민의식

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

이 글은 조선후기 영남 지방관이 공무의 일상에서 祈雨祭儀를 어떻게 설행했는지 살펴보려는 의도에서 시도되었다. 그 대상은 주로 영남 지방관으로 재직했던 ?園 吳宖默(1834~?)의 기우제의에 주목하였다. 채원의 기우 의식에 관심을 가지는 데는 몇 가지 이유가 있다. 먼저 그는 중앙보다 주로 외직이었던 지방관으로 재직하였고, 그것도 장기간 영남 지방관을 지냈다는 점이다. 채원이 지방관으로서 지냈던 기우제 의례는 공무적이지만, 상당히 역동적이고 탄력적이었다. 지방관이 설행했던 기우제의는 지방관으로서 공무를 수행하는 일상의 의례적인 면도 있었지만, 그 외연에는 사회통합적인 측면을 고려한 지방관의 적극적인 노력과 민에 대한 세심한 배려도 깔려있었다. 지방관은 한발이라는 자연 재해의 위기에 자신이 주관한 기우제의를 통하여 백성들과 더욱더 가까이 접촉할 수 있는 계기를 마련하였고, 특히 채원이 설행했던 두 차례에 걸쳐 별도로 기획된 기우제의는 민을 우선적으로 배려하면서도 엄연하게 사회 질서를 유지하였고, 향촌의 모든 신분 층위[官·鄕·吏]가 상호 소통할 수 있는 공간으로 마련되었던 것이다. 지방관은 祈雨祭儀 기간에 기우제 설행에 따른 齋戒에 많은 정성을 쏟았지만, 한편으로는 대민 관계에서 세심한 배려도 아끼지 않았다. 가뭄으로 인한 백성들의 고통을 공감하면서 과일이나 금전을 지급하기도 하였고, 기우제의를 진행하는 데 있어서 백성들에게 물질적 정신적 부담을 최소화 하였다. 이러한 지방관의 기우제의 설행의 일상적 행위는 與民同樂하는 치자의 자세이며 官民이 상호 소통할 수 있는 한 단면이기도 하다. 국가나 지방에서 실시하는 관 주도의 기우제 설행에서 祭場의 선택, 祭需의 준비, 祭文의 창작 등은 형식적인 절차와 의식을 진행하는데 있어서 가장 기본적인 제의의 구성 요소들이다. 물론 이러한 것들은 유교적 이념에 입각한 종교적 의례이니 만큼 민간에서 행하는 기우제의 呪術性보다 금기 행위나 신념 체계가 그리 복잡하지 않은 편이다. 그래서 제장, 제수, 제차 등은 法典에 정해진 祭式을 그대로 준행하는 것이 일반적이다. 이 가운데서 주목할 만한 것은 제문이다. 제문은 제의의 주관자가 사회적, 자연적 정치적 현실을 반영할 수 있는 하나의 수단이었으며, 자신이 旱魃에 대응하는 적극적 관심과 齋戒의 정도를 피력할 수 있는 방편이기도 하였다. 물론 기우제 제문의 서식이 천편일률적으로 지어져 형식에 얽매인 면이 없지는 않았다. 형식에 급급하거나 산발적으로 기우제를 설행한 경우, 그리고 제문을 식자 계층에서 대작한 경우에는 한발에 대한 인식과 그 대응 방식을 규명하기 어렵다. 하지만 장기간 동안 수차례 기우제를 설행하면서 지방관이 직접 지은 제문에서는 이러한 면을 추출할 수 있는 단서를 찾을 수 있다. 정식 13차 기우제의를 마친 후, 별도로 기획된 두 차례 기우제의의 제문은 앞서 설행하였던 정식 제의의 제문에 비해 자유로운 산문 형식이다. 아울러 분량 역시 장문이면서 탄력적인 내용으로 祈雨에 대한 자신의 의지를 피력하였다. 자연에 대한 지방관의 인식은 유교적 이념에서 해석하고 이해하였다. 그래서 한발은 백성들의 죄에 의한 것이 아니고, 자신의 죄로 돌렸다. 한발로 흉년이 들면 신에게 바칠 제물조차 없게 됨으로 신에게도 해가 있을 것임을 언급하고 있다. 결국 지방관은 신과 인간은 서로 상보해야 하는 관계로 인식했던 것이다. 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.

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.