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유성영 釜山敎育大學 1971 부산교육대학 논문집 Vol.7 No.1
It is said that in Korea there are folklore and dance, but there is no dance art. This means that Korean dance lacks philosophy and creativeness. Especially we Koreans, living in modern society, have not yet possessed so-called modern dance. This study aims to Survey several distinguished dancers such as Isadora Dancan, Rudolf Von Laban, Mary Wigman, Martha Graham, Paul Tayler, Mercer Cunningham, I shii Baku, etc. and study on their opinions, artistic features of their works, their personalities, and their artistic achivements in order to analize the back wardness of modern dance in Korea. The conclusions of the study are as follows: 1. Modern dance can be explained as an art of genuine physical exercise. And the writer believes that internal contents makes outer form and that art cannot be expressed without form. consequently, first of all, there must be a foundation of artistic skill that is more flexible in a sense than ballet. 2. Modern dance should be a confession of modern age, an utterance of a new world, a hope that gives a courage to our future life, and an art which is beautiful outwardly and expressive of passionate individuality inwardly. 3. Modern dancers should abwndantly possess a sense of times, creativeness, a high standard of inteligence, and an inexhaustible vigor. 4. The restoration of Modern dance in Korea is one of the urgent problems. And the writer believes that the standard of the dancer's theories should be raised, that the general audience of dance should be enlightened, and that there must be well gualified leaders in this field who have been eguipped with both theory and practice. Consequently, we are expecting great success in the dance courses of colleges and their graduates' career services.
전산유체 기법을 이용한 DAF 부상조에서의 수리 특성 고찰
김성훈,유제선,김영미,박희경 대한상하수도학회 2002 상하수도학회지 Vol.16 No.4
Dissolved air flotation is a solid-liquid separation process that uses fine rising bubbles to remove particles in water. DAF is found most effective in treating algae and lower density flocs that are hard to remove in sedimentation process. Some researcher reports the results of an experimental study which examined the flow within the flotation zone of a DAF tank (ONeill at al., 1997). I would be concluded that, in general, the flow within flotation zone is robust and that differences in the performance of individual DAF tanks must be the result of processes occurring within the contact zones of these tank, not as the result of flotation processes. In this research, the authors thought that the efficiency of the DAF process is strongly related to bubble size. It means bubble rising velocity at the air injection nozzle is most important factor of DAF process. However, bubble movement in DAF tank is somewhat complicate, so it is hard to make up conceptual model through simple mass balance as other researchers did (Leppinen at. al., 2000). For the modeling of turbulent 2-phase flow in the tank, the standard k-ε model was used in CFD code because it is widely accepted and the coefficients for the model are well established. This model uses the eddy-viscosity hypothesis for the turbulence. As the result of this study, the authors concluded that bubble size and its rising velocity is very important factor of DAF process and the recycle ratio must be also consider for the flotation zone parameter. Also, For the improved model, relation between turbulent intensity and bubble-particle attachment must be studied.
손종렬,이용성,유인성 高麗大學校 倂設 保健大學 保健科學硏究所 2001 保健科學論集 Vol.27 No.2
In this study, the series of ultrasonic irradiation for the improvement of sludge dewaterability in sewage treatment plant has been selected as a model reaction in the batch reactor system in order to obtain the basic data investigate the influence of various experimental parameters such as irradiation time, frequency and instensity of ultrasound. These experiments were performed on the ultrasonic frequency of 28 KHz, 40KHz and ultrasonic intensity of 50 W/㎠ 100W/㎠ And then the tests measured the Specific Resistance to Filtration(SRF), the dissolved solids concentration and Sludge Volume(SV30) in conditions of ultrasound. In experimental results, the dissolved solids concentration of filtrate was increase in proportional to the ultrasonic irradiation time. To the contrary, the SV30 and SRF were reduced in proportional to increase of irradiation time in each experimental conditions. This results meants that the efficiency of sludge dewaterability is due to the ultrasonic effect that changes the structures of sludge. Finally, it appeared that the technology using ultrasonic irradiation can be applied to the pre-treatment of sludges which are difficult to be dehydrated by the conventional methods.
Multilayered Pt/Ru nanorods with controllable bimetallic sites as methanol oxidation catalysts
Yoo, Sung Jong,Jeon, Tae-Yeol,Kim, Kyoung Sik,Lim, Tae-Hoon,Sung, Yung-Eun Royal Society of Chemistry 2010 Physical chemistry chemical physics Vol.12 No.46
<P>A physical synthesis of multilayered Pt/Ru nanorods with controllable bimetallic sites as methanol oxidation catalysts is reported for the first time. The novel nanorods were synthesized <I>via</I> the oblique angle deposition method, deposited prior to the formation of each individual noble metal layer, in a sequential fashion. It has been shown that the oblique angle deposition controls the morphology and electrochemical properties of the resultant nanostructures. Sequentially the multilayered nanorods comprising Pt and Ru segments exhibited superior electrocatalytic activity when compared to equivalent monometallic Pt nanorods with respect to methanol electrooxidation reaction in an acidic medium. Moreover, it has been established that the electrochemical process takes place at the Pt/Ru nanorods followed the bifunctional mechanism. The relative rates of reaction, recorded using chronoamperometry, show a linear relationship between the long-time current density and the number of Pt/Ru interfaces. Interestingly, the best catalyst for methanol oxidation was found to the surface of bimetallic Pt/Ru nanorods produced by the heat treatments <I>via</I> the so-called electronic effect. This reflects the fact that the ensemble effects of combined bifunctional and electronic effects <I>via</I> second elements could be expected in methanol oxidation reactions. Electrocatalytic activities correlate well with bimetallic pair sites and electronic properties analyzed by X-ray photoemission spectroscopy and X-ray absorption near-edge structure.</P> <P>Graphic Abstract</P><P>The ensemble effects of combined bifunctional and electronic effects <I>via</I> Ru elements in methanol oxidation were discussed. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cp00737d'> </P>
Effect of particle size of PtRu nanoparticles embedded in WO3 on electrocatalysis.
Yoo, Sung Jong,Park, Hee Young,Hwang, Seung Jun,Pyo, Sung Gyu,Kim, Soo-Kil,Sung, Yung-Eun,Lim, Tae-Hoon American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.5
<P>Size-controlled PtRu nanoparticles embedded in WO3 were prepared by simultaneous multigun sputtering on pure targets of Pt, Ru, and WO3. The mean diameter of the PtRu nanoparticles, as confirmed by high-resolution transmission electron microscopy, can be varied from -2.3 to -3.6 nm by varying the RF power ratio of PtRu and WO3. On the basis of transmission electron diffraction results for the PtRu nanoparticles embedded in WO3, it was confirmed that PtRu exists as an alloy metal phase, whereas the WO3 matrix is present as an amorphous phase. Size-controlled PtRu/WO3 electrodes were found to exhibit unique electronic properties depending on their size, which affected the potential of zero total charge and the methanol oxidation reaction. The mass activity of PtRu/WO3 for methanol oxidation was determined by the interplay of the surface electronic factors at the metal-solution interface; the oxophilicity of the nanoparticles increased with decreasing particle size.</P>
Photochemical Response Analysis on Drought Stress for Red Pepper (Capsiumannuum L.)
Sung-Yung Yoo,Yong-Ho Lee,So-Hyun Park,Kyong-mi Choi,June-Young Park,A-Ram Kim,Su-Min Hwang,Min-Ju Lee,Tae-Seok Ko,Tae-Wan Kim 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.6
The aim of this study is to determine the drought stress index through photochemical analysis in red pepper (Capsiumannuum L.). The photochemical interpretation was performed in the basis of the relation between Kautsky effect and Photosystem II (PSII) following the measurement of chlorophyll, pheophytin contents, and CO₂ assimilation in drought stressed 5-week-old red pepper plants. The CO₂ assimilation rate was severely lowered with almost 77% reduction of chlorophyll and pheophytin contents at four days after non-irrigation. It was clearly observed that the chlorophyll fluorescence intensity rose from a minimum level (the O level), in less than one second, to a maximum level (the P-level) via two intermediate steps labeled J and I (OJIP process). Drought factor index (DFI) was also calculated using measured OJIP parameters. The DFI was -0.22, meaning not only the initial inhibition of PSII but also sequential inhibition of PSI . In real, most of all photochemical parameters such as quantum yield of the electron transport flux from Quinone A (QA) to Quinone B (QB), quantum yield of the electron transport flux until the PSI electron acceptors, quantum yield of the electron transport flux until the PSI electron acceptors, average absorbed photon flux per PSII reaction center, and electron transport flux until PSI acceptors per cross section were profoundly reduced except number of QA reducing reaction centers (RCs) per PSII antenna chlorophyll (RC/ABS). It was illuminated that at least 6 parameters related with quantum yield/efficiency and specific energy fluxes (per active PSII RC) could be applied to be used as the drought stress index. Furthermore, in the combination of parameters, driving forces (DF) for photochemical activity could be deduced from the performance index (PI) for energy conservation from photons absorbed by PSII antenna until the reduction of PSI acceptors. In conclusion, photochemical responses and their related parameters can be used as physiological DFI.