Crosslinked anion exchange membranes with primary diamine-based crosslinkers for vanadium redox flow battery application

Cha, Min Suc,Jeong, Hwan Yeop,Shin, Hee Young,Hong, Soo Hyun,Kim, Tae-Ho,Oh, Seong-Geun,Lee, Jang Yong,Hong, Young Taik Elsevier 2017 Journal of Power Sources Vol.363 No.-

<P><B>Abstract</B></P> <P>A series of polysulfone-based crosslinked anion exchange membranes (AEMs) with primary diamine-based crosslinkers has been prepared via simple a crosslinking process as low-cost and durable membranes for vanadium redox flow batteries (VRFBs). Chloromethylated polysulfone is used as a precursor polymer for crosslinked AEMs (CAPSU-x) with different degrees of crosslinking. Among the developed AEMs, CAPSU-2.5 shows outstanding dimensional stability and anion (Cl<SUP>−</SUP>, SO<SUB>4</SUB> <SUP>2−</SUP>, and OH<SUP>−</SUP>) conductivity. Moreover, CAPSU-2.5 exhibits much lower vanadium ion permeability (2.72 × 10<SUP>−8</SUP> cm<SUP>2</SUP> min<SUP>−1</SUP>) than Nafion 115 (2.88 × 10<SUP>−6</SUP> cm<SUP>2</SUP> min<SUP>−1</SUP>), which results in an excellent coulombic efficiency of 100%. The chemical and operational stabilities of the membranes have been investigated via ex situ soaking tests in 0.1 M VO<SUB>2</SUB> <SUP>+</SUP> solution and in situ operation tests for 100 cycles, respectively. The excellent chemical, physical, and electrochemical properties of the CAPSU-2.5 membrane make it suitable for use in VRFBs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The crosslinking between polymer chains are constructed by 4,4′-diaminobenzophenone. </LI> <LI> The crosslinked AEMs were fabricated by commercial polysulfone (PSU; Udel<SUP>®</SUP> P-3500). </LI> <LI> The crosslinked AEM based on PSU indicated good chemical and dimensional stability. </LI> <LI> The performance of crosslinked AEM showed high EE (86%) with high capacity retention. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Ether-free polymeric anion exchange materials with extremely low vanadium ion permeability and outstanding cell performance for vanadium redox flow battery (VRFB) application

Cha, Min Suc,Jo, Sang Woo,Han, Seung Hui,Hong, Soo Hyun,So, Soonyong,Kim, Tae-Ho,Oh, Seong-Geun,Hong, Young Taik,Lee, Jang Yong Elsevier 2019 Journal of Power Sources Vol.413 No.-

<P><B>Abstract</B></P> <P>Ether-free poly(<I>p</I>-phenylene)-based anion exchange membrane materials with outstanding vanadium ion blocking properties are reported. The synthesized ionomers with a rigid backbone structure show small dimensional variations despite the high ion exchange capacities. Among the synthesized membranes, the QPPP-2 membrane with ion exchange capacity of 2.1 meq·g<SUP>−1</SUP> exhibits high anion (OH<SUP>−</SUP>, SO<SUB>4</SUB> <SUP>2−</SUP>, and Cl<SUP>−</SUP>) conductivity. The QPPP-2 membrane shows an extremely low diffusion coefficient (2.12 × 10<SUP>−9</SUP> cm<SUP>2</SUP> min<SUP>−1</SUP>) for VO<SUP>2+</SUP>, which is much lower than that of Nafion 115 (2.88 × 10<SUP>−6</SUP> cm<SUP>2</SUP> min<SUP>−1</SUP>), indicating the vanadium ion blocking property of QPPP-2. Moreover, the chemical and operational stabilities of the membranes are investigated <I>via</I> ex situ soaking tests in 0.1 M VO<SUB>2</SUB> <SUP>+</SUP> solution and in situ operation tests for 100 cycles, respectively. The vanadium redox flow battery single cell assembled with the QPPP-2 membrane exhibits a coulombic efficiency of 99%, voltage efficiency of 87%, and energy efficiency of 86% during 100 cycles at 80 mA cm<SUP>−2</SUP>. The excellent chemical, morphological, and electrochemical properties of the QPPP-2 membrane make it suitable for use in vanadium redox flow battery.</P> <P><B>Highlights</B></P> <P> <UL> <LI> AEMs are fabricated by a Ni(0)-catalyzed cross-coupling reaction. </LI> <LI> The synthesized ionomers indicated excellent dimensional and chemical stability. </LI> <LI> Ether-free polymeric AEMs showed extremely low vanadium ion cross over. </LI> <LI> The performance of developed AEM showed high EE (87%) with high capacity retention. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

자돈에 있어 게르마늄 용질액의 급여가 성장 및 혈액학적 변화에 미치는 영향

홍종욱,권오석,민병준,조진호,진영걸,손경승,강종옥,김인호 한국국제농업개발학회 2004 韓國國際農業開發學會誌 Vol.16 No.4

본 연구의 목적은 이산화게르마늄을 함유한 게르마늄 용질액을 자돈에 급여하였을 때 성장 및 혈액학적 변화에 미치는 영향을 조사하기 위하여 실시하였다. 3원 교잡종 자돈 60두 (평균체중 11.22±0.10㎏)를 공시하였다. 시험설계는 옥수수-대두박 위주의 대조구(CON)와, 대조구 사료내 게르마늄 용질액을 0.5 ppm 첨가한 구(GC0.5) 및 대조구 사료내 게르마늄 용질액을 1.0 ppm 첨가한 구(GC1.0)로 3개 처리를 하였다. 0-10일간 사양시험기간동안, 일당증체량에 있어서 GC0.5 처리구가 약간 높게 평가되었다(quadratic effect, P<0.02). 그러나 전체 시험기간동안, 일당증체량, 일당사료섭취량 및 사료효율에 있어서 처리구간에 유의적인 차이는 보이지 않았다. 영양소 소화율에 있어서는 GC0.5 처리구가 조회분(linear effect, P<0.01; quadratic effect, P<0.04), 칼슘(linear effect, P<0.01; quadratic effect, P<0.01), 인 (linear effect, P<0.02; quadratic effect, P<0.04) 소화율이 유의적으로 높게 평가되었다. 혈액내 neutrophil 농도에 있어서는 게르마늄 용질액의 첨가 수준이 증가함에 따라 유의적으로 증가하는 경향을 나타내었다(quadratic effect, P<0.02). 결론적으로, 자돈 사료내 게르마늄 용질액의 급여가 성장 및 혈액학적 수치에는 영향을 미치지 못하는 것으로 사료된다. This study was conducted to investigate the effects of dietary germanium colloid on the growth performance and hematological values in nursery pigs. Sixty pigs (11.22(0.10 ㎏ average initial body weight) were used in a 20 d growth assay. Dietary treatments included 1) CON (basal diet), 2) GC0.5 (basal diet+0.5 ppm germanium colloid) and 3) GC1.0 (basal diet+1.0 ppm germanium colloid). For d 0 to 10, pigs fed GC0.5 diet grew faster than pigs fed CON and GC1.0 diets (Quadratic effect, P<0.02). However, through the entire experimental period, no statistical differences were found for aver-age daily gain, average daily feed intake and gain/feed. Apparent digestibilities of crude ash (Linear effect, P<0.01; Quadratic effect, P<0.04), calcium (Linear effect, P<0.01; Quadratic effect, P<0.01) and phosphorus (Linear effect, P<0.02; Quadratic effect, P<0.04) in pigs fed GC0.5 diet were greater than for pigs fed CON and GC1.0. Neutrophil concentration in blood increased as the concentration of germanium colloid in the diets was increased with significant difference (Quadratic effect, P<0.02). In conclusion, growth performance and hematological values were not influenced by dietary germanium colloid.

Total oxy-radical scavenging capacity assay를 이용한 taurine과 hypotaurine의 항산화 활성 측정

오정민,주홍매,김상겸,김봉희 忠南大學校 生命科學硏究院 醫藥品開發硏究所 2006 藥學論文集 Vol.21 No.-

Taurine, a sulfur containing non-amino acid, is one of the most abundant intracellular amino acid in humans, and hypotaurine is a precursor of the synthesis of taurine. While it is widely believed that taurine may play an important role in protecting cells against toxic injury by functioning as an antioxidant, there is a lack of evidence to support this hypothesis. In this study, total oxy-radical scavenging capacity(TOSC) assay was used to evaluate antioxidant activity of taurine and hypotaurine against peroxyl radical, hydroxyl radical and peroxynitrite. The present results show that taurine does not have oxy-radical scavenging activity and hypotaurine is comparable to glutathione, an antioxidant substance, in oxy-radical scavenging activity. The results suggest that protective effects of taurine against oxidative stress may not be associated with its direct oxy-radical scavenging activity. Difference in oxy-radical scavenging capacity between taurine and hypotaurine may be ascribed to their sulfur oxidation state.

만화 과제를 이용한 정신분열병 환자의 사회인지 능력의 측정

오정은,나명현,하태현,신용욱,노규식,홍순범,이경진,신민섭,이영호,권준수 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.3

Objectives : This study is to investigate the hypothesis that schizophrenic patients have difficulty in inferring mental state of others. Methods : Twenty schizophrenic patients and twenty normal subjects were administered to the Cartoon Task required inferring the character's intention in a given context. Results : The schizophrenic patients showed a statistically significant impairment in the Cartoon Task. Both groups chose the card depicting a frequent everyday action significantly more rather than the similar card to the last picture in each story for wrong answers. Conclusion : These preliminary results suggest that schizophrenia is associated with a specific deficit of the cognitive ability referred to as social cognition, and this deficit can be detected not only in the acute phase as found in previous research studies, but also in remission. Also when subjects fail to appreciate what is going on in the minds of other people, they seem to rely on a socially familiar experience.

경기도 용인시(경희대학교) 주변지역의 지하수 오염현황

오종민,김홍석,진현오,윤세철 경희대학교 환경연구소 1998 環境硏究 論文集 Vol.8 No.-

Recently, the concern about groundwater pollution is increasing. And, groundwater was one of the major water resource used as drinking water by eighty percent of the world population, and its utility as industry water, agriculture water, fresh water was increasing. But, when pollution material was found in housing well, by purifying polluted water, the area of doing thorough conservation management was few. Thus, if water resource being regard as unlimited source, the right view of nature and scientific utility were essential because of the problem of its value. The purpose of this study was that investigated groundwater quality pollution condition in the part areas of Kyunggi-do Suwon Si, Yong-In Si, proposed to efficient management plan for pollution occurrence prevention and groundwater quality development by surveying groundwater pollution source. The result of the study was that the groundwater by use purpose could systematically manage water quality since development beginning, management system about groundwater development with use can established.

주의력결핍 과잉활동 장애 아동에서 약물 단독 치료와 부모 훈련 병합 치료의 효과 비교

홍강의,오경자,신민섭 대한소아·청소년정신의학회 1995 소아청소년정신의학 Vol.6 No.1

ART2 신경회로망을 이용한 공구마모 모니터링

오동백,노민석,장우일,최국진,홍대선 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

Titanium alloys have been mainly used for aircraft components as well as implant materials. Although a number of cutting tools and cutting methods have been developed for improving the cutting processes, they have difficulties such as tool wear and failure. This study considers a novel approach to on-line monitoring of tool wear and failure in titanium alloy cutting processes. The on-line monitoring system mainly consists of two parts: The one is on-line data acquisition with sensors and a DSP board through LabView and a web server, and the other is learning and prediction of tool wear and failure using an ART2 neural network algorithm. The system is installed at an on-site machine tool to monitor high speed steel(HSS) tools for cutting titanium alloy. A number of experiment are carried out to demonstrate the effectiveness of the proposed system.

정신 장애 아동들의 어머니의 MMPI 유형 분석

홍강의,신민섭,오경자 대한소아ㆍ청소년정신의학회 1992 소아청소년정신의학 Vol.3 No.1

공공정보자원의 상업화 모델 개발 및 적용방안

홍필기,윤상오,방민석 한국정보사회진흥원 2007 정보화정책 Vol.14 No.3

본 논문의 목적은 공공정보자원의 활용도 제고 및 지식정보산업 육성을 통한 국가경쟁력 강화의 기반으로서, 공공정보자원의 상업화 모델을 개발하고 이를 적용하기 위한 주요 이슈를 점검하고 정책적 시사점을 제공하는 것이다. 이를 위하여 미국∙EU∙영국∙캐나다의 공공정보자원 활용 제고를 위한 상업화 정책과 상업화 모델로서 자금조달(Funding Model), 비용회수(Cost Recovery Model), 수익창출(Revenue Generation) 모델을 검토하였다. 이를 토대로 공공정보자원의 생명주기와 가치사슬 모델을 활용하여 ⅰ) 공공기관 직접 상업화, ⅱ) 민간계약 상업화, ⅲ) 민∙관 공동생산 상업화, ⅳ) 민간완전위탁 상업화라는 네가지 모델을 개발하고 장단점을 살펴보았다. 그리고 이러한 모델을 우리나라의 공공정보자원 상업화에 적용하기 위해서 선결되어야 할 주요 이슈로서 공공정보 상업화의 비전과 목표, 상업화의 대상 및 범위, 상업화의 주체, 공공정보 저작권, 요금부과 방식과 이윤배분∙활용 및 예산지원, 관련 법제도 정비 등을 검토하였다. This study formulates a strategy for commercial utilization of the public sector information(PSI) to promote efficient provision and effective utilization of information. Models for commercialization of the PSI are suggested in consideration of the life cycle perspectives and the commercial arrangements of the PSI. As to the life cycle perspectives, three stages of commercialization - Funding, Cost Recovery, and Revenue Generation - are proposed based on the analysis of cost structure and the economic viability of the public sector information. This paper also considers various types of commercialization scheme and suggests four types of business arrangement for commercialization of the PSI as a sustainable mechanism. Reviewing the literature on the major countries and organizations relevant to commercialization of the PSI, we examine each of four types of commercialization arrangement in the context of an information resource life cycle along a value chain of the PSI. The study also identifies key issues such as copyright and suggests relevant policies for PSI commercialization such as pricing scheme, related legal and institutional requirements. The suggestions in this study can be the foundation for further detailed researches and practical policies regarding the PSI commercialization.