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Oxidation-stable amine-containing adsorbents for carbon dioxide capture

Kyungmin Min, Woosung Choi, Chaehoon Kim, Minkee Choi
2018 Nature Communications  
Amine-containing solids have been investigated as promising adsorbents for CO 2 capture, but the low oxidative stability of amines has been the biggest hurdle for their practical applications. Here, we developed an extra-stable adsorbent by combining two strategies. First, poly(ethyleneimine) (PEI) was functionalized with 1,2-epoxybutane, which generates tethered 2-hydroxybutyl groups. Second, chelators were pre-supported onto a silica support to poison p.p.m.-level metal impurities (Fe and Cu)
more » ... that catalyse amine oxidation. The combination of these strategies led to remarkable synergy, and the resultant adsorbent showed a minor loss of CO 2 working capacity (8.5%) even after 30 days aging in O 2containing flue gas at 110°C. This corresponds to a~50 times slower deactivation rate than a conventional PEI/silica, which shows a complete loss of CO 2 uptake capacity after the same treatment. The unprecedentedly high oxidative stability may represent an important breakthrough for the commercial implementation of these adsorbents.
doi:10.1038/s41467-018-03123-0 pmid:29463914 pmcid:PMC5820286 fatcat:mq4w2p63vvg7bjksxi3iht6efu

Non-swellable self-healing polymer with long-term stability under seawater

Chaehoon Kim, Hirotaka Ejima, Naoko Yoshie
2017 RSC Advances  
A non-swellable and highly self-healable polymer in seawater is obtained. Dynamic crosslinking of catechol-based polymers with p-phenyldiboronic acid through non-ionic boronate ester bonds is the key to realizing these two properties simultaneously.
doi:10.1039/c7ra01778b fatcat:dmoj7nm35bbnrkqgaxpm3whfoy

Feature Point Detection By Combining Advantages Of Intensity-Based Approach And Edge-Based Approach

Sungho Kim, Chaehoon Park, Yukyung Choi, Soon Kwon, In So Kweon
2012 Zenodo  
, Chaehoon Park, Yukyung Choi, Soon Kwon, In So Kweon A World Academy of Science, Engineering and Technology International Journal of Computer and Information Engineering Vol:6, No:8, 2012 1055  ...  Detection by Combining Advantages of Intensity-based Approach andEdge-based Approach International Science Index, Computer and Information Engineering Vol:6, No:8, 2012 Sungho Kim  ... 
doi:10.5281/zenodo.1077948 fatcat:5op5qnvkebbjtemn7r7j4oz5q4

Toward an understanding of the increase in enzymatic hydrolysis by mechanical refining

Tiago de Assis, Shixin Huang, Carlos Eduardo Driemeier, Bryon S. Donohoe, Chaehoon Kim, Seong H. Kim, Ronalds Gonzalez, Hasan Jameel, Sunkyu Park
2018 Biotechnology for Biofuels  
Mechanical refining is a low-capital and well-established technology used in pulp and paper industry to improve fiber bonding for product strength. Refining can also be applied in a biorefinery context to overcome the recalcitrance of pretreated biomass by opening up the biomass structure and modifying substrate properties (e.g., morphology, particle size, porosity, crystallinity), which increases enzyme accessibility to substrate and improves carbohydrate conversion. Although several
more » ... zation methods have been used to identify the changes in substrate properties, there is no systematic approach to evaluate the extent of fiber cell wall disruption and what physical properties can explain the improvement in enzymatic digestibility when pretreated lignocellulosic biomass is mechanically refined. This is because the fiber cell wall is complex across multiple scales, including the molecular scale, nano- and meso-scale (microfibril), and microscale (tissue level). A combination of advanced characterization tools is used in this study to better understand the effect of mechanical refining on the meso-scale microfibril assembly and the relationship between those meso-scale modifications and enzymatic hydrolysis. Enzymatic conversion of autohydrolysis sugarcane bagasse was improved from 69.6 to 77.2% (11% relative increase) after applying mechanical refining and an increase in enzymatic digestibility is observed with an increase in refining intensity. Based on a combination of advanced characterizations employed in this study, it was found that the refining action caused fiber size reduction, internal delamination, and increase in pores and swellability. A higher level of delamination and higher increase in porosity, analyzed by TEM and DSC, were clearly demonstrated, which explain the faster digestibility rate during the first 72 h of enzymatic hydrolysis for disc-refined samples when compared to the PFI-refined samples. In addition, an increased inter-fibrillar distance between cellulose microfibrils at the nano-meso-scale was also revealed by SFG analysis, while no evidence was found for a change in crystalline structure by XRD and solid-state NMR analysis.
doi:10.1186/s13068-018-1289-3 pmid:30386426 pmcid:PMC6201573 fatcat:cq4qk4zlmvdl7jlfsk6uwv7sqi

Visual tracking for non-rigid objects using Rao-Blackwellized particle filter

Jungho Kim, Chaehoon Park, In-So Kweon
2010 2010 IEEE International Conference on Robotics and Automation  
and Chaehoon Park are with the Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, Korea, In-So  ...  Tracking errors for human 2 (The person inside the blue box in Figure 8) (c) Tracking errors for human 3 (The person inside the green box in Figure 8) Performance evaluation with other methods Jungho Kim  ... 
doi:10.1109/robot.2010.5509949 dblp:conf/icra/KimPK10 fatcat:k5rjyjhbrvbwlgfj3avyhhiire

Component Analysis and Reproduction of a Brown Solid Cosmetic Excavated from Tomb of Princess Hwahyeop

Chaehoon Lee, Song-e You, Hanhyoung Lee, Hyoyun Kim, Seongmi Kim, Yongjae Chung
2020 Journal of Conservation Science  
서 론 재현 가능성을 확인할 수 있었다(Chung, 2019; Kim, 2019). 2. 연구방법 2.1.  ...  이를 통해 출토화장품 HC10은 유기화합물과 광물질 성분의 혼합으로 제조된 형태인 것을 추측할 수 있었다(Kim, 2019). Figure 4 . 4 FTIR of HC10 (Kim, 2019) . Figure 5 . 5 pH value of reproduced cosmetic cream as aging with UV on 0h to 672h.  ... 
doi:10.12654/jcs.2020.36.5.12 fatcat:wp6tqwgox5fvhhtfl2ncx4sw64

Prediction of vascular access stenosis: Blood temperature monitoring with the Twister versus static intra-access pressure ratio

Yoo Jin Choi, Young-Ki Lee, Hayne Cho Park, Eun Yi Kim, Ajin Cho, Chaehoon Han, Sun Ryoung Choi, Hanmyun Kim, Eun-Jung Kim, Jong-Woo Yoon, Jung-Woo Noh, Micah Chan
2018 PLoS ONE  
The Kidney Disease Outcomes Quality Initiative (KDOQI) guidelines recommend intraaccess flow (Qa) measurement as the preferred vascular access surveillance method over static intra-access pressure ratio (SIAPR). Recently, it has become possible to perform Qa measurement during hemodialysis using thermodilution method called blood temperature monitoring (BTM) with the Twister device. The aim of this study was to investigate the correlation between Qa by BTM and SIAPR and to compare the
more » ... e of two tests in prediction of vascular access stenosis.
doi:10.1371/journal.pone.0204630 fatcat:tivpcng6b5b53cxhnkq6bsyasa

Epoxide-functionalization of polyethyleneimine for synthesis of stable carbon dioxide adsorbent in temperature swing adsorption

Woosung Choi, Kyungmin Min, Chaehoon Kim, Young Soo Ko, Jae Wan Jeon, Hwimin Seo, Yong-Ki Park, Minkee Choi
2016 Nature Communications  
doi:10.1038/ncomms12640 pmid:27572662 pmcid:PMC5013602 fatcat:i756eoxelnh7fdq4x2bbq2t4um

Design of a Convergence Point Adjustment Method to Minimize Visual Discomfort due to Zoom-In
줌인에 따른 시각적 불편을 최소화하기 위한 컨버전스 포인트 조정 기법의 설계

JongSoo Ha, ChaeHoon Ban, DaeWoong Kim, ChiHun Kim
2013 The Journal of the Korean Institute of Information and Communication Engineering  
Even though a dual lens stereoscopic camera allows for convenient stereoscopic photography, the necessity for the research comes up, since the dual lens stereoscopic camera can cause visual discomfort during zoom-in due to the fixed convergence point. We propose a method based on which a convergence point can be adjusted to prevent visual discomfort during zoom-in for a dual lens stereoscopic camera. First, the relational model is classified into nine kinds and defined, depending on locations
more » ... focus, object, and convergence point. And then, the method to minimize visual discomfort is suggested by adjusting convergence point on the given model. We also implement the suggested methods with anaglyph computer graphic and demonstrate the superiority of them. 키워드 이안식 일체형 입체카메라, 컨버전스포인트, 시각적 불편, 줌, 양안시차
doi:10.6109/jkiice.2013.17.3.665 fatcat:dcbfc5y4dnhbpbbnoys3nzhfsq

Usages of Mobile Views for Battery Efficiency of a Smart Phone
스마트폰 배터리 효율을 위한 모바일 뷰의 활용

ChaeHoon Ban, DongHyun Kim
2012 The Journal of the Korean Institute of Information and Communication Engineering  
점진적 변경(유형 2) Fig. 3 Incremental update(type 2) 점진적변경  질의요청 뷰탐색 뷰변경 질의처리  소스변경결과전송 (7) 저자소개 한국정보통신학회 논문지 제16권 제9호 참조 김동현(DongHyun Kim) 한국정보통신학회 논문지 제16권 제10호 참조  ...  송욱, 김지홍, "네트워크 사용 경향성을 활 용한 스마트폰 네트워크 에너지 최적화 기법", 한국 컴퓨터종합학술대회 논문집 제39권 제1호, pp 152-154, 2012 [4] 임덕성, 반재훈, 문상호, 홍봉희, "공간 데이터베이 스에서 클라이언트 뷰의 일관성 제어 기법", 한국정 보과학회 논문지 제28권 제 2호, pp 140-152, 2001 반재훈(ChaeHoon  ... 
doi:10.6109/jkiice.2012.16.11.2418 fatcat:misth5rvbbacvgy2norntmgaty

Lower diastolic wall strain is associated with coronary revascularization in patients with stable angina

Jaehuk Choi, Min-Kyung Kang, Chaehoon Han, Sang Muk Hwang, Sung Gu Jung, Han-Kyul Kim, Kwang Jin Chun, Seonghoon Choi, Jung Rae Cho, Namho Lee
2017 BMC Cardiovascular Disorders  
Left ventricular (LV) diastolic dysfunction occurs earlier in the ischemic cascade than LV systolic dysfunction and electrocardiographic changes. Diastolic wall strain (DWS) has been proposed as a marker of LV diastolic stiffness. Therefore, the objectives of this study were to define the relationship between DWS and coronary revascularization and to evaluate other echocardiographic parameters in patients with stable angina who were undergoing coronary angiography (CAG). Methods: Four hundred
more » ... rty patients [mean age: 61 ± 10; 249 (57%) men] undergoing CAG and with normal left ventricular systolic function without regional wall motion abnormalities were enrolled. Among them, 128 (29%) patients underwent revascularization (percutaneous intervention: 117, bypass surgery: 11). All patients underwent echocardiography before CAG and the DWS was defined using posterior wall thickness (PWT) measurements from standard echocardiographic images [DWS = PWT(systole)-PWT(diastole)/PWT(systole)]. Results: Patients who underwent revascularization had a significantly lower DWS than those who did not (0.26 ± 0.08 vs. 0.38 ± 0.09, p < 0.001). Age was comparable between the two groups (61 ± 9 vs. 60 ± 11, p = 0.337), but the proportion of males was significantly higher among patients who underwent revascularization (69 vs. 52%, p = 0.001). The LV ejection fraction was similar but slightly decreased (60.9 ± 5.7 vs. 62.4 ± 6.2%, p = 0.019) and the E/E' ratio was elevated (10.3 ± 4.0 vs. 9.0 ± 3.1, p < 0.001) among patients who underwent revascularization. In multiple regression analysis, lower DWS was an independent predictor of revascularization (cut-off value: 0.34; sensitivity: 89%; AUC: 0.870; SE: 0.025; p < 0.001). Conclusion: DWS, a simple parameter that can be calculated from routine 2D echocardiography, is inversely associated with the presence of coronary artery disease and the need for revascularization.
doi:10.1186/s12872-017-0739-3 pmid:29284413 pmcid:PMC5745902 fatcat:ouuvcku2srfo5dzz6fmshr4dtm

Serum alkaline phosphatase and γ-glutamyl transferase in acute pyelonephritis

Chaehoon Han, Young-Ki Lee, Hayne Cho Park, Ajin Cho, Sun Ryoung Choi, Jong-Woo Yoon, Ja Ryong Koo, Hyung Jik Kim, Jung-Woo Noh, Min-Jeong Park
2019 Kidney Research and Clinical Practice  
Ja Ryong Koo, Hyung Jik Kim, and Jung-Woo Noh participated in the study design and performed the statistical analysis.  ...  Authors' contributions Chaehoon Han, Hayne Cho Park, and Sun Ryoung Choi participated in the data collection and wrote the manuscript.  ...  First, we did not evaluate biomarkers such as cystatin C, NGAL, or KIM-1. Second, our sample size for fractional excretion and isoenzyme analyses was small.  ... 
doi:10.23876/j.krcp.18.0074 pmid:30841691 pmcid:PMC6577211 fatcat:ieqr2sjtvzbfllvdmkda6vww74

Design and Implementation of a Mobile Framework for Efficient Inventory Management of Refrigerated Warehouses
효율적인 냉동창고 재고관리를 위한 모바일 프레임워크의 설계 및 구현

ChaeHoon Ban, DongHyun Kim
2013 The Journal of the Korean Institute of Information and Communication Engineering  
한국정보통신학회논문지 제17권 제2호 346 저자소개 반재훈(ChaeHoon Ban)  ...  고찰", 대한설비공학회지 제38권 제4호, pp 23-32, 2009.4 [4] 이태규, 주홍민, 김종민, 반재훈, "레거시 시스템을 지원하는 SaaS 기반 냉동창고 관리 미들웨어의 설 계", 한국정보통신학회 종합학술대회 논문집 제15 권 제2호, pp 212-214, 2011.10 한국정보통신학회 논문지 제 16권 제 11호 참조 김동현(DongHyun Kim  ... 
doi:10.6109/jkiice.2013.17.2.341 fatcat:pjc32kwwzjh7hmtjyzv52whr5y

Robust Binary Feature Using the Intensity Order [chapter]

Yukyung Choi, Chaehoon Park, Joon-Young Lee, In So Kweon
2015 Lecture Notes in Computer Science  
Acknowledgement We would like to thank Jungho Kim and Jiyoung Jung for their support.  ... 
doi:10.1007/978-3-319-16865-4_37 fatcat:dehzqfhdpjfgzjll5lcabdaxcy