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Parametric Studies on the Performance of Anion Exchange for Nitrate Removal
Yoon, Taekyung,Shon, Zang Ho,Lee, Gangchoon,Moon, Byunghyun,Byeongil,Noh, Sung, Nakchang 한국화학공학회 2001 Korean Journal of Chemical Engineering Vol.18 No.2
Ion exchange performance to remove nitrate in surface and underground water was studied experimentally in batch and continuous operation systems under various conditions. Data were collected by using commercially available strong-base anion-exchange resins of Cl^- and OH^- types. Equilibrium curves, obtained through the batch system and plotted as the concentration ratio versus run time, were used to evaluate the effects of temperature, resin type, and initial feed concentration on the equilibrium characteristics of nitrate. The selectivity coefficients of the resins were correlated as a function of temperature by using the Kraus-Raridon equation. Breakthrough curves, obtained through the continuous column system and plotted as the ratio of effluent to influent concentration versus solution volume passed through the experimental column, gave detailed results about the effects of the system parameters, such as temperature, resin type, feed concentration, volumetric flow rate, column diameter and height on the performance of the anion exchange to remove nitrate. The results of this study could be scaled up and used as a design tool for a water-purification system of real ground water and surface water treatment processes.
Pore Structure Analysis to Adsorb NOx Gas based on Porous Materials
Lim Taekyung,La Yunju,Jeon Ok Sung,Park Sang Yoon,Yoo Young Joon,Yang Keun-Hyeok 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.9
We studied the adsorption of nitrogen oxides according to various porous materials room temperature, which can effectively to adsorb the nitrogen oxides. Based on results of measuring NOx concentration, the activated carbon materials have been shown to adsorb NOx well, and they have been shown to more efficiently removing NO2, which is very harmful to the environment. In particular, in the case of the coconut activated carbon, the removal efficiency of NO and NO2 was very excellent, and the removal rate of was 30% for 100 minutes and 19.5% for 840 minutes. Our measurement results confirmed that the activated carbon materials have a very large specific surface area and pore volume. In addition, the coconut activated carbon appears to have a large specific surface area and pore volume to remove NOx over a long period of time. Based on the experimental results, it is expected to be used as a material that efficiently removes nitrogen oxides at room temperature.
Lee, Taekyung,Kwak, Byung Je,Kong, Taein,Lee, Jeong Hun,Lee, Sang Won,Park, Sung Hyuk ELSEVIER SCIENCE 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.803 No.-
<P><B>Abstract</B></P> <P>This study investigated a caliber-rolled Mg–6Zn-0.5Zr (ZK60) alloy as part of an effort to achieve enhanced mechanical properties and bulk dimension out of lab scale. The caliber-rolled ZK60 alloy presented a high fraction of dynamically recrystallized (DRXed) grains with submicron sizes. The alloy also exhibited simultaneous improvements in strength and ductility in comparison to commercially extruded ZK60 alloys. The ultrafine-grained (UFG) structure and enhanced mechanical properties were attained while maintaining bulk dimension, which was difficult with severe plastic deformation processes. Furthermore, caliber rolling gave rise to nearly symmetric behavior in terms of yielding. These mechanical improvements in the caliber-rolled ZK60 alloy were interpreted in light of its microstructural characteristics, such as UFG structure, DRX, precipitates, basal texture with tilting of <I>c</I>-axes, and activation of mechanical twinning.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A caliber-rolled ZK60 alloy was investigated for the first time. </LI> <LI> It showed a high frequency of dynamic recrystallization comprising ultrafine grains. </LI> <LI> It showed the enhanced strength-ductility balance and yield symmetry. </LI> <LI> Effective grain refinement and dynamic recrystallization led to the improvements. </LI> <LI> Suppressed activation of extension twinning also contributed to the improvements. </LI> </UL> </P>
성태경,Sung, Taekyung 서비스사이언스학회 2017 서비스연구 Vol.7 No.2
본 논문은 IT업계에서 기술 상용화에 영향을 미치는 주요 요인을 파악하고, 기술 상용화 주요요인이 상용화의 성공에 미치는 영향력을 검증하는데 있다. IT 기술 상용화 프로젝트 관리자들은 기술의 상용화에 가장 영향을 미치는 요인으로 '기술 상용화 장려책'을 꼽았고, 뒤이어 '경영층 지원,' '정부 지원,' '관계자간의 협력,' '경영에 대한 이해' 순으로 평가하였다. 회귀분석 결과 기술 상용화에 영향을 미치는 11개 주요 요인은 종합적으로 기술 상용화의 성공에 대한 설명력이 높은 것으로 나타났다. 특히 '기술 상용화 장려책,' '관련자간의 협력,' '수요자 요청 기술'은 유의수준 1%에서 '기술 상용화 경험'은 유의수준 10%에서 통계적으로 유의하여 기술 상용화의 성공에 가장 많은 기여를 하는 것으로 판명되었다. 성공한 상용화 프로젝트의 경우 주요 요인의 기술 상용화의 성공에 대한 설명력(46.80%)이 실패한 프로젝트의 설명력(38.50%)에 비해 높은 것으로 나타났다. The purposes of this paper is to identify CSFs for technology commercialization in IT industry, and to empirically investigate the impact of CSFs on the success of technology commercialization. Comprehensive literature study identifies eleven factors affecting the process and results of technology transfer and the research results show that 'Incentives for Commercialization,' 'Leadership Support,' 'Government Support,' 'Cooperation among Parties,' and 'Understanding of Business' are the most influential factors. Regression analyses show that CSFs in total have very significant explanatory power in the success of technology commercialization. 'Incentives for Commercialization,' 'Cooperation among Parties, 'Demand-Pull Technology', and 'Commercialization Experience' are statistically significant in explaining the success of commercialization. Successful commercialization projects show higher explanatory power (46.80%) than failure projects (38.50%).
MATLAB/Simulink를 이용한 자동차용 고분자전해질형 연료전지 시스템의 단순화된 성능 모델링 연구
황태경(Taekyung Hwang),김경일(Kyungil Kim),신동유(Dongyou Shin),윤희준(Heejun Yoon),김한상(Han-Sang Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This study is primarily concerned with the simplified performance modeling of automotive PEMFC(proton-exchange membrane fuel cell) systems. To this end, the PEMFC stack and BOP components(e.g. turbo blower, humidifier, and cooling circuit etc.) are modeled by using MATLAB/Simulink environment. As a result, the efficiency and performance of the automotive PEMFC system are mainly analyzed with various operating conditions. It is expected that the results of this study will contribute to the development of robust simulation tools for automotive PEMFC system.
Winning the crowd in online fundraising platforms: The roles of founder and project features
Kim, Taekyung,Por, Meng Hong,Yang, Sung-Byung Elsevier 2017 Electronic Commerce Research and Applications Vol.25 No.-
<P><B>Abstract</B></P> <P>Crowdfunding is regarded as a novel way of collecting money for innovators to introduce products or services they ultimately wish to launch. The question arises, however, of what makes funding projects on these online platforms, with their different features of project evaluation and risk management, more successful than traditional fundraising approaches. We examine this question in the context of a pre-ordering model, which is also known as the reward-based crowdfunding model. A large-sample data analysis based on 116,956 crowdfunding projects on Kickstarter showed that most founder (i.e., identity disclosure and prior experience) and project (i.e., comments, updates, description elaborateness, and campaign duration) features have a positive effect on successful crowd fundraising. We also found a negative relationship between the funding goal amount and successful fundraising. Our findings may contribute not only to knowledge accumulation in crowdfunding research, but also to founders by offering evidence-based guidelines on the design of successful crowdfunding projects in an online fundraising platform.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Influential factors of successful crowdfunding projects are identified. </LI> <LI> The roles of founder and project features of crowdfunding projects are examined. </LI> <LI> Most features except funding goal have a positive effect on crowd-fundraising. </LI> <LI> Funding goal and campaign duration have a negative interaction effect on fundraising. </LI> </UL> </P>
A-site Doping Effect of Multiferroic BiFeO3 Ceramics
Lim Taekyung,Jeon Ok Sung,La Yunju,Park Sang Yoon,Yoo Young Joon,Yang Keun-Hyeok 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.11
The structural, magnetic and ferroelectric properties of polycrystalline A-site ($A$ = Ho, Pr and Ce of 10%) doped BiFeO3, which were prepared by the solid-state and rapid sintering methods, have been investigated. The powder X-ray diffraction pattern reveals that all the samples show rhombohedral perovskite structure R3c. The Ho-doped BiFeO3 shows that the magnetic property is slightly increased due to compressive lattice distortion and Ho3+ ion doping effect. For the Pr and Ce doped BiFeO3, the remnant polarization and coercive field increased because Pr3+ and Ce3+ ions substitution suppressed oxygen vacancies.