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조영상,최호석 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.3
분리탑에 대한 정상상태에서의 차수감소모델(reduced order model)을 개발하였다. 차수감소모델의 정확도를 확인하기 위해서 차수감소모델의 결과를 정밀모사결과(rigorous tray-by-tray model)와 비교해 보았으며, 그 결과 차수감소모델의 정확도를 확인할 수 있었고, 또한 상당한 계산시간의 감소를 확인할 수 있었다. Reduced order steady state models for separation columns are developed. The accuracy and efficiency of the reduced order models are also demonstrated by comparing the simulation results obtained by using the reduced order models with rigorous tray by tray calculations.
조영상,김가영,설혜윤,김은연,문일준 대한이비인후과학회 2021 Clinical and Experimental Otorhinolaryngology Vol.14 No.2
Objectives. The aim of this study was to investigate the current university admission rate and experiences of educational support among students with cochlear implants (CIs) in South Korea. Methods. A prospective online survey was conducted to examine the university admission process and academic support for students with CIs. Thirty individuals who took the college entrance exams at least 3 years after CI surgery were invited to participate, although two did not respond. The survey consisted of three topics (demographics, university admission process, and academic support) and 25 items regarding laws and policies related to university admission and support for students with hearing disabilities in Korea. Results. The university matriculation rate for students with CI was 85.7% (24/28), of whom 50% were admitted through the special admission process for students with disabilities. Most universities provided teaching and learning support and rental services for assistive devices for students with disabilities to help them better adapt to school life. However, only a small percentage of the students benefited from accommodation services, and 62.5% and 12.5% of the students received teaching and learning support and used assistive devices, respectively. Conclusion. To the best of our knowledge, this is the first study to investigate the university admission process and university disability services for students with CIs in South Korea. The results of this study will be helpful for young CI recipients and their parents as they prepare for university entrance.
조영상,Andrew Richards,Stuart Jones 한국교양교육학회 2019 교양교육연구 Vol.13 No.4
The purpose of this study is to investigate Korean university students’ perceptions of how the fourth industrial revolution (4IR) technology (e.g., Artificial Intelligence, Big Data, and Augmented Reality/ Virtual Reality) will contribute to current and future general English (GE) education at Korean universities in the era of 4IR. Data were collected from 177 university students who were taking GE classes at a Korean university at the time this study was conducted, and a survey questionnaire which includes multiple choice, Likert scale, and open-ended questions, was used as the main data collection method. Data were analyzed by following descriptive statistics and the general qualitative data analysis method. The findings of this study show that students perceive that some, but not all problems that current GE classes have could be fixed by the 4IR technology. In addition, they believe that the development of 4IR technology will drive a change of the future GE education, but some aspects of current GE classes (e.g., their mandatory status at university and learning in an offline context) and the roles of human agents (e.g., students’ ownership of their English learning and human teachers’ different roles to AI teachers’) should be valued in the future GE classes. Educational Implications of the findings and limitations of the study are also discussed.
조영상,Tae-Yeol Kim,이기라,Young Kuk Kim,Chul Jin Choi 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.1
We have introduced the Pickering emulsion systems to generate novel confining geometries for the selforganization of monodisperse polymer microspheres using nanoparticle-stabilized emulsion droplets encapsulating the building block particles. Then, through the slow evaporation of emulsion phases by heating,these microspheres were packed into regular polyhedral colloidal clusters covered with nanoparticle-stabilizers made of silica. Furthermore, polymer composite colloidal clusters were burnt out leaving nonspherical hollow micro-particles, in which the configurations of the cluster structure were preserved during calcination. The selfassembled porous architectures in this study will be potentially useful in various applications such as novel building block particles or supporting materials for catalysis or gas adsorption.
조영상,오인애,정누리 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.6
Porous silica particles were synthesized by an emulsion-assisted self-assembly process. The templating materials, polymericnanospheres or block copolymers, were self-organized with the precursor inside emulsions to prepare porous ceramic particlesafter calcination. The thermal insulating properties of mesoporous, macroporous, and meso-macroporous particles werecompared by measuring their thermal diffusivity using a laser flash apparatus. The insulating properties of the porousparticles could be controlled by changing the emulsification conditions using a rotating cylinder instead of a conventionalhomogenizer to induce a hollow interior structure of the porous particles. The lowest value of the thermal conductivity wasrecorded as roughly 10 mW/mK for the meso-macroporous particles, which is comparable to previous materials includingaerogels. The porous ceramic particles additionally can be applied as coating materials for superhydrophobic surfaces via alotus effect.
Continuous Synthesis of Monodisperse Spherical Silica Powder Using Tubular Reaction System
조영상,황치엽,김성준,박우현 대한금속·재료학회 2022 대한금속·재료학회지 Vol.60 No.6
In the present study, monodisperse silica nanospheres were synthesized using a tubular reaction system in a continuous way. Screw-type blades were inserted inside a T-mixer for static mixing of the reactant streams which consisted of TEOS and NH4OH/H2O diluted with ethanol, for the continuous synthesis of the silica suspension. The diameter of the silica powder was monitored as a function of production time using dynamic light scattering to determine the optimum retention time and tube length, which were found to be 125 minutes and 7.5 m, respectively. The effects of reactant compositions on particle size were investigated by adjusting the amount of ammonia and water in the sol-gel reaction, which were then compared with the results from a batch reactor. Both the particle size and polydispersity index (PDI) of the silica suspension were measured to be comparable to nanospheres synthesized using a batch reactor. This implies that the tubular reaction system is more beneficial for potential industrial production applications in the size range from 115 to 310 nm, due to its continuous powder synthesis. The effect of the reaction medium was also studied, by replacing ethanol with methanol or propanol, indicating that the deviation in particle size with production time was not a serious issue in alcohols with lower molecular weight, such as methanol and ethanol.