화학독립영양세균의 탄소전환 성능 향상을 위한 생물전기화학 반응 최적화 연구

김희수(HuiSu Kim),문명훈(Myunghoon Moon),이지예(Ji Ye Lee),이유림(Yu Rim Lee),이상민(Sangmin Lee),고창현(Chang Hyun Ko),이진석(Jinsuk Lee),이수연(Soo youn Lee) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7

화석연료의 사용량의 급격한 증가는 인간의 삶에 편리를 가져왔지만 이에 온실가스 배출량이 증가함에 따라 지구온난화로 인한 기후변화 등의 피해가 심각해지고 있다. 그에 대응하기 위해 온실가스 배출을 줄이기 위한 노력과 배출된 이산화탄소(CO<SUB>2</SUB>) 활용방안에 대한 관심이 높아지고 있는 추세이고, 발전소 또는 산업체에서 배출되는 이산화탄소를 포집·활용·저장(CCUS)에 대한 연구가 활발히 진행되고 있다. 포집된 이산화탄소는 생촉매(효소, 미생물)를 활용하는 생물전기합성 시스템(Microbial electrosynthesis system)에서 탄소전환(carbon conversion)을 통해 다양한 부가가치 산물로 전환될 수 있으며, 태양광 에너지로 물 분해(water splitting)를 통해 산소(O<SUB>2</SUB>) 및 양성자(H<SUP>+</SUP>)를 생산할 수 있는 애노드(anode, 산화전극)와 CO<SUB>2</SUB>, 양성자(H<SUP>+</SUP>) 및 환원력(전자, e^-)를 전달하여 생촉매 내 대사전환을 통해 CO<SUB>2</SUB>를 부가가치 산물로 전환시킬 수 있는 캐소드(cathode, 환원전극)로 구성되어 있다. 또한, 애노드 및 캐소드에 쓰이는 전극 물질은 미생물에게 독성이 없고, 경제적으로 효율이 좋은 graphite felt를 사용하였다. 본 연구에서 사용된 화학독립영양세균인 Rhodobacter sphaeroides는 광합성 기작을 통해 에너지를 얻을 수 있으며, 수소와 CO<SUB>2</SUB>를 활용하여 성장할 수 있다. 따라서 R. sphaeroides를 미생물전기합성 시스템에 적용시켜, 캐소드로부터 직접적으로 환원력을 전달받아 CO<SUB>2</SUB>를 부가가치 산물로 전환하도록 설계하였다. 더욱이, R. sphaeroides의 가스상 CO<SUB>2</SUB> 이용 효율을 향상시키기 위해 CO<SUB>2</SUB> 흡수제를 공급함으로써 부가가치 산물의 생산성을 증가시키기 위한 미생물전기합성 시스템 최적화 연구를 진행하였다.

Steady States and dynamic Behavior of an LDPE Autoclave Reactor

Jinsuk Lee,Kil Sang Chang,Jae-Yeon Kim,Hyun-Ku Rhee 제어로봇시스템학회 1989 제어로봇시스템학회 국내학술대회 논문집 Vol.1989 No.10

Yesterday, Today and Tomorrow of Biodiesel Production from Microalgae

Jinsuk Lee 한국생물공학회 2011 한국생물공학회 학술대회 Vol.2011 No.10

Crystallinity of silicon/carbon composite materials for rechargeable battery

Jinsuk Lee,Yujeong Ahn,Sihyun Lee 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.6

The silicon battery’s uncontrollable volume change during the lithiation process leads to a severely decreased battery life. Despite such a critical drawback of the material, the unparalleled capacity potential of silicon (Si) batteries is what makesit the next generation’s most anticipated battery anode material. The first part of determining the capacity of a Si anodeis the Si core itself. Our research indicated that the higher the purity of Si results in a naturally higher crystallinity status. When the purity of the sample was identical, monocrystalline Si proved to have higher crystallinity than polycrystalline andamorphous. The second part that determines the capacity is the graphite used in the composite. Natural Graphite (NG) havehigher crystallinity values than Artificial Graphite (AG) and show more resistant properties to the crystallinity breakingdown by milling time, which inspected by particle size analyzer, optical transmission and microscope. We reached a millingmethod of getting small particle sizes yet high crystallinity and graphene presence, which expect to improve the robustnessof anode materials and electrochemical performances. The third part that determines coated carbon layers accommodate thevolume change and prevents the quick loss of capacity, indicating higher crystallinity. Finally, the composites prepared withthis method showed that higher X-ray Diffraction (XRD) and Raman Spectroscopy peaks than commercial references. Weconcluded how high crystallinity used in silicon carbon composite materials show high capacity potential with integrity inrechargeable battery.

Mg3(VO4)2-MgO-ZrO2 nano-catalysts for oxidative dehydrogenation of n-butane.

Lee, Jong Kwon,Seo, Hyun,Hong, Ung Gi,Yoo, Yeonshick,Cho, Young-Jin,Lee, Jinsuk,Park, Gle,Chang, Hosik,Song, In Kyu American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.11

<P>A series of X-Mg3(VO4)2-MgO-ZrO2 nano-catalysts with different vanadium content (X = 3.3, 5.3, 7.0, 10.2, and 13.4) were prepared by a single-step citric acid-derived sol-gel method for use in the oxidative dehydrogenation of n-butane to n-butene and 1,3-butadiene. The effect of vanadium content of X-Mg3(VO4)2-MgO-ZrO2 nano-catalysts on their physicochemical properties and catalytic activities in the oxidative dehydrogenation of n-butane was investigated. Successful formation of X-Mg3(VO4)2-MgO-ZrO2 nano-catalysts was confirmed by XRD, Raman spectroscopy, and ICP-AES analyses. The catalytic performance of X-Mg3(VO4)2-MgO-ZrO2 nano-catalysts strongly depended on vanadium content. All the X-Mg3(VO4)2-MgO-ZrO2 nano-catalysts showed a stable catalytic performance without catalyst deactivation during the reaction. Among the catalysts tested, 7.0-Mg3(VO4)2-MgO-ZrO2 nano-catalyst showed the best catalytic performance in terms of yield for total dehydrogenation products (TDP, n-butene and 1,3-butadiene). TPRO (temperature-programmed reoxidation) experiments were carried out to measure the oxygen capacity of the catalyst. Experimental results revealed that oxygen capacity of the catalyst was closely related to the catalytic performance. Yield for TDP increased with increasing oxygen capacity of the catalyst.</P>

Dynamic Characteristics of an LDPE Autoclave Reactor with Heat Transfer

Jinsuk Lee,Kil Sang Chang,Hyun-Ku Rhee 제어로봇시스템학회 1991 제어로봇시스템학회 국내학술대회 논문집 Vol.1 No.2

Bioenergy R&D in KIER

Jinsuk LEE,Youkwan OH 한국생물공학회 2011 한국생물공학회 학술대회 Vol.2011 No.10

Direct Dehydrogenation of n-Butane Over Pt/Sn/Zn—K/Al₂O₃ Catalyst: Effect of Hydrogen in the Feed

Lee, Jong Kwon,Seo, Hyun,Kim, Jeong Kwon,Seo, Hanuk,Cho, Hye-Ran,Lee, Jinsuk,Chang, Hosik,Song, In Kyu American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5

<P>Al2O3 was prepared by a sol-gel method for use as a support. Pt/Sn/Zn-K/Al2O3 catalyst was then prepared by a sequential impregnation method, and it was applied to the direct dehydrogenation of n-butane to n-butenes and 1,3-butadiene. Physicochemical properties of Pt/Sn/Zn-K/Al2O3 catalyst were examined by X-ray diffraction (XRD), nitrogen adsorption-desorption isotherm, inductively coupled plasma atomic emission spectroscopy (ICP-AES), temperature-programmed reduction (TPR), CO chemisorption, and temperature-programmed oxidation (TPO) measurements. In order to improve the catalyst stability, the effect of hydrogen in the feed on the catalytic performance in the direct dehydrogenation of n-butane was studied. The catalyst stability and reusability in the direct dehydrogenation of n-butane was also investigated. Experimental results revealed that the addition of hydrogen in the feed decreased conversion of n-butane and yield for total dehydrogenation products but improved the stability of the catalyst. The catalytic activity and stability of regenerated Pt/Sn/Zn-K/Al2O3 catalyst in the presence of hydrogen slightly decreased compared to those of fresh Pt/Sn/Zn-K/Al2O3 catalyst due to the slight sintering of platinum particles.</P>

ABSTRACT OR CONCRETE MESSAGES? WHICH REVIEWS ARE MORE EFFECTIVE TO CONSUMERS ON ONLINE SHOPPING PLATFORMS?

JinSuk Lee,Sunnyoung Lee 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07

This study examines the impact of others' reviews (reviews, product ratings) on consumer responses (helpfulness & buying intention) in an online shopping platform. We propose that review features, such as review message construal and review inconsistency between review message valence and rating, determine review credibility as product-related information, which in turn influences helpfulness of review and buying intention toward the product. Specifically, low- level construal review messages will be perceived as more credible than high-level construal review messages, which affect helpfulness and buying intention. In addition, the effect of review message construal will be moderated by review inconsistency. The effect of the review message construal will be enhanced in the condition of review consistency (positive content-high rating & negative content-low rating), but it will be disappeared or attenuated in the condition of inconsistency (positive content-low rating, negative content-high rating).

‘2015 개정교육과정’에 대한 언론의 인식

이진숙(Lee, JinSuk),김은주(Kim, EunJu),김대현(Kim, DaeHyun) 학습자중심교과교육학회 2018 학습자중심교과교육연구 Vol.18 No.1

The purpose of this study was to analyze the perception of the media on the 2015 revised curriculum by using semantic network analysis method for newspaper articles. The results were as follows. First, in the keyword frequency analysis, the frequency rate of mathematics, history, textbooks, and nationalization was high. Second, it could be confirmed that the interest in the macroscopic view of the integrated education of ‘Liberal Art and Natural Science was gradually replaced by the micro and practical interest. And regarding to the textbook reorganization , controversy over the nationalization of history textbooks was especially emphasized, and there was a tendency related to university entrance examination system. Third, most of the negative responses were in the ‘preparation period of the curriculum’. However, the frequency of positive keywords increased significantly as the period of curriculum application increased. Based on these results, the need for public opinion through objective perspectives, the analysis of issues that can be reflected in the revision of national curriculum, and the importance of public opinion tendency were discussed. 이 연구는 ‘2015 개정 교육과정’에 대한 언론의 인식을 탐색하기 위하여 2013년 10월 24일부터 2017년 7월 31일까지의 주요 일간지에 실린 2015 개정 교육과정 관련 신문기사를 수집하여 언어네트워크 분석을 실시하였다. 분석 결과 첫째, 키워드빈도 분석에서는 수학, 역사, 교과서, 국정화 등의 빈도가 높게 나타났다. 둘째, ‘문·이과통 합형’ 교육과정에 대한 거시적인 안목에서의 관심이 점차 미시적이고 실제적인 관심 으로 대체되고 있음을 확인할 수 있었고, ‘교과서 개편’과 관련하여서는 ‘역사 교과서의 국정화’ 논란이 특히 부각되었으며, ‘대입제도 개편’ 관련 쟁점들에 대한 경향성도 발견할 수 있었다. 셋째, ‘교육과정 고시 준비 시기’에는 대부분 부정적인 반응이 주를 이루고 있었으나, 점차 ‘교육과정 적용 기간’으로 갈수록 긍정적인 키워드가 월등히 많아지고, 그 빈도도 매우 높게 나타났다. 이러한 연구결과는 객관적인 시각을 통한 여론형성의 필요성, 국가 교육과정 개정에 반영될 수 있는 쟁점분석과 여론의 경향성 파악에 대한 중요성을 시사한다.