The Unique Role of Novel Cellulosomal Subunit in Clostridium cellulovorans Explored by Cohesin Marker Related to Binding on Insoluble Cellulosic Substrate

SoHyeong KIM,SangDuck SANG,SuJung KIM,JeongEun HYEON,BomYi PARK,SungOk HAN 한국생물공학회 2015 한국생물공학회 학술대회 Vol.2015 No.10

Korea Citation Index and Its Macro Bibliometrics

Kim, Sohyeong,Choi, Taejin,Yoon, Aeran,Seol, Sung-Soo Asian Society for Innovation and Policy 2013 Asian Journal of Innovation and Policy Vol.2 No.2

This paper introduces the Korea Citation Index (KCI) and also some macro statistics of KCI. KCI started service since 2008 by the National Research Foundation of Korea (NRF), but the data has been gathered from 1998. Our findings are as follows: heavy reliance on books in humanities, but papers as the main reference in all other disciplines. Impact factor is an increasing trend in all disciplines. Social science has the highest impact factor among all fields. In some fields even in science and engineering areas, there are more KCI papers than Korean JCR papers and impact factors of the KCI are higher than JCR. As for the distinction between nationally and internationally fields or journals, some disciplines in social science are clearly nationally oriented. NSE journals listed in both KCI and JCR, however, are not clear in terms of impact factor, but clear in terms of the numbers of papers.

활성탄 담지 Co-B/C, Co-P-B/C 촉매를 이용한 NaBH₄ 가수분해 반응

오소형 ( Sohyeong Oh ),김유겸 ( Youkyum Kim ),배효준 ( Hyojune Bae ),김동호 ( Dongho Kim ),변영환 ( Younghwan Byun ),안호근 ( Ho-geun Ahn ),박권필 ( Kwon-pil Park ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.5

휴대용 고분자전해질 연료전지의 수소발생용으로써 NaBH4는 많은 장점을 갖고 있다. 본 연구에서는 활성탄 담지 Co-B/C, Co-P-B/C 촉매의 NaBH₄ 가수분해 특성에 대해 연구하였다. 촉매의 BET 표면적, 수소 수율, NaBH₄ 농도 영향, 촉매 내구성 등을 실험하였다. 활성탄에 담지시킴으로써 BET 면적이 비담지 촉매에 비해 2~3배 증가해 500 m²/g 이상이 되었다. 활성탄 담지 촉매의 수소발생이 비담지 촉매보다 더 안정적이었다. 20 wt% NaBH₄에서 활성화 에너지가 59.4 kJ/mol로 Co-P-B/FeCrAlloy 촉매 보다 14% 낮았다. 활성탄 담지 촉매가 비담지 촉매에 비해 촉매 손실이 1/3~1/2로 감소해 활성탄에 촉매를 담지시킴으로써 내구성을 향상시킬 수 있었다. Sodium borohydride, NaBH₄, shows a number of advantages as hydrogen source for portable proton exchange membrane fuel cells (PEMFCs). Properties of NaBH4 hydrolysis reaction using activated carbon supported Co-B/C, Co-P-B/C catalyst were studied. BET surface area of catalyst, yield of hydrogen, effect of NaBH₄ concentration and durability of catalyst were measured. The BET surface area of carbon supported catalyst was over 500 m²/g and this value was 2~3 times higher than that of unsupported catalyst. Hydrogen generation of activated carbon supported catalyst was more stable than that of unsupported catalyst. The activation energy of Co-P-B/C catalyst was 59.4 kJ/mol in 20 wt% NaBH₄ and 14% lower than that of Co-P-B/FeCrAlloy catalyst. Catalyst loss on activated carbon supported catalyst was reduced to about 1/3~1/2 compared with unsupported catalyst, therefore durability was improved by supporting catalyst on activated carbon.

담수 사용 NaBH₄ 가수 분해반응에 의한 수소발생

오소형 ( Sohyeong Oh ),유동근 ( Donggeun Yoo ),김태호 ( Taeho Kim ),김익균 ( Ikgyun Kim ),박권필 ( Kwon-pil Park ) 한국화학공학회 2021 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.59 No.4

이동용 고분자전해질 연료전지(PEMFC)의 수소발생용으로써 NaBH₄는 많은 장점을 갖고 있다. 야외에서 PEMFC가 이송형으로 사용될 때 증류수대신 담수를 이용해 NaBH₄ 가수분해하면 경제적이다. 그래서 본 연구에서는 NaBH₄ 가수분해 과정에 증류수대신 담수를 이용해 수소를 발생시켰다. 활성탄 담지 Co-P-B/C 촉매를 사용해 NaBH₄ 가수분해 특성에 대해 연구하였다. 담수는 NaBH₄ 가수분해과정에서 4수화물을 발생시키지 않았고, 증류수는 4수화물 부산물이 생성되어 가수분해과정에서 많은 물이 소모되어서 NaBH₄ 25% 이상 고농도에서 반응 종료시점에는 건조한 부산물과 미반응 NaBH₄가 남았음을 확인하였다. 이 결과 담수를 사용했을 때 NaBH₄ 25% 이상 고농도에서 증류수보다 수소 수율과 수소발생속도가 더 높아 무인항공기등 이송형 연료전지에도 적용하기에 적합함을 보였다. Sodium borohydride, NaBH₄, has many advantages as hydrogen source for portable proton exchange membrane fuel cells (PEMFC). When PEMFC is used outdoors as a transport type, it is economical to hydrolyze NaBH₄ using fresh water instead of distilled water. Therefore, in this study, hydrogen was generated using fresh water instead of distilled water during the NaBH₄ hydrolysis process. The properties of NaBH₄ hydrolysis were studied using an activated carbon-supported Co-P-B/C catalyst. Fresh water did not generate tetrahydrate during the NaBH₄ hydrolysis process, and distilled water produced tetrahydrate by-products, which consumed a lot of water during the hydrolysis process, indicating that at the end of the reaction at a high concentration of 25% or more of NaBH₄, dry by-products and unreacted NaBH₄ remained. As a result, when fresh water was used, the hydrogen yield and hydrogen generation rate were higher than that of distilled water at a high concentration of 25% or more of NaBH₄, indicating that it is suitable for use in transport-type fuel cells such as unmanned aerial vehicles.

생태학 분야 데이터 저널 발행 전략 연구 - K기관을 중심으로 -

정영임,권오석,김기동,김소형,서태설,김선태,Jung, Youngim,Kwon, Ohseok,Kim, Kidong,Kim, Sohyeong,Seo, Tae-Sul,Kim, Suntae 한국도서관·정보학회 2020 한국도서관정보학회지 Vol.51 No.4

오픈 사이언스 시대 연구데이터의 공개를 가속화하고 접근성 및 인용가능성 개선 및 연구데이터에 대한 표준화된 기술문서 제공은 또 다른 과학적 발견에 기여할 수 있어 데이터 출판이 주목을 받고 있다. 또한 출판된 데이터 역시 연구논문과 동등한 지위를 유지할 수 있는 방안으로 데이터 논문이 대두되고, 새로운 학술출판의 유형으로 데이터 저널 발간이 증가추세에 있다. 특히 생태학 분야는 대규모 연구데이터가 생산되고 관리되어야 하는 분야로 전세계적으로 데이터 저널 발간이 활발하다. 반면 국내에는 데이터 저널 연구가 초기 단계이고, 생태학 분야 데이터 저널이 전무하다. 이에 본 연구에서는 생태 분야의 데이터 저널을 발간하기 위한 전략을 탐색하고 제시하였다. 먼저 국내외 데이터 저널 발간 현황과 국내 저널 출판 현황을 조사하였다. 또한 학술출판 및 오픈액세스 정책 전문가, 생태학 학술지 발간 전문가로 구성된 전문가그룹 인터뷰를 수행하였다. 현재 데이터 저널 발간 인프라가 제대로 구축되지 않고 이에 대한 평가체제가 갖추어 지지 않은 국내 학술출판 관행을 반영하고 국내외 조사결과와 전문가 FGI를 실시 결과를 바탕으로 생태학 분야 데이터 저널 출간 방향, 데이터 논문 투고지침, 저널 구성 및 발행주기, 저널 편집위원 구성, 원고의 수급 측면에서 전략을 제시하였다. The importance of data publishing in the open-science era is increasing as it can contribute to other scientific discoveries by accelerating the sharing of research data, improving accessibility and citability, and providing standardized technical documentation for research data. In addition, the need for data papers is emerging as a way for data papers to maintain a status equivalent to research papers, and the publication of data journals is on the rise as a new type of scholarly publishing. In particular, the field of Ecology is a field where large-scale research data are produced and managed, thus the data journal publishing in this field is active worldwide. On the other hand, the research on data journal is in its early stages in Korea, and there is no data journal in the field of Ecology. Thus, this study explores and presents strategies for publishing data journals in the ecological field. First, we investigate the publishing status of domestic and international data journals and the publication status of domestic journals. Then, we conducted a focused group interview with experts of scholarly publishing, open access policy and journal publishing in the field of Ecology. Finally, based on the survey and the expert FGI's results, strategies are suggested in terms of publishing data journals in the field of ecology, organizing and publishing journals, organizing journal editors, and receiving manuscripts.

Changes in Insomnia Severity are Associated With the Changes in Discrepancy Between Desired Time in Bed and Desired Total Sleep Time Among the General Population

Seockhoon Chung,Sohyeong Kim,Inn-Kyu Cho,Dongin Lee,Jiyoung Kim,Eulah Cho 대한신경정신의학회 2023 PSYCHIATRY INVESTIGATION Vol.20 No.12

Objective The discrepancy between desired time in bed and desired total sleep time (DBST index) is correlated with the severity of insomnia among the general population. This study aimed to explore whether the change in DBST index is associated with changes in insomnia severity.Methods The study was conducted as a single source tracking online survey among the general population. The first survey (T1) was completed by all 399 participants, and the second survey (T2) was completed by 233 participants 5–6 weeks after the T1 survey with a simple instruction of reducing the DBST index. Participants’ age, sex, marital status, past psychiatric history, and sleep patterns were collected. In addition to the DBST index, the Glasgow Sleep Effort Scale (GSES), Dysfunctional Beliefs about Sleep-2 items (DBS-2), and Insomnia Severity Index (ISI) were rated.Results The change in the ISI (T1–T2) was significantly correlated with the changes in the GSES (r=0.24, p<0.001), DBS-2 (r=0.22, p<0.001), and DBST index (r=0.15, p=0.020). The change in insomnia severity was expected with change in the GSES (β=0.23, p<0.001), DBS-2 (β=0.20, p=0.002), and DBST index (β=0.13, p=0.037). Mediation analysis showed that change in DBST index directly influenced change in insomnia severity and change in GSES or DBS-2 did not mediate the relationship.Conclusion Changing the DBST index can be a simple way to reduce insomnia severity among the general population.

No Association Between Insomnia Severity, and Discrepancy Between Desired Time in Bed and Desired Total Sleep Time Among Shift-Working Nursing Professionals

Bzeih Wafaa,Kim Sohyeong,Yi Kikyoung,Chung Seockhoon 대한수면학회 2023 sleep medicine research Vol.14 No.3

Background and Objective This study aimed to explore whether the discrepancy between a patient’s desired time in bed and desired total sleep time (DBST index) can be used as a tool to assess the insomnia severity of shift-working nursing professionals.Methods Two studies were conducted during two different times among two groups of shiftworking nursing professionals working in COVID-19 inpatient wards (study I), or nurses who witnessed patient death during the previous 2 years (study II), using a single voluntary survey. The survey was completed by a total of 366 participants: 226 in the first study, and 140 in the second. Participants’ age, sex, marital status, and past psychiatric history were collected. In addition to questions regarding the DBST index, the Glasgow Sleep Effort Scale (GSES), Dysfunctional Beliefs about Sleep-2 items (DBS-2), and the Insomnia Severity Index (ISI) were assessed.Results In both studies, the DBST index did not reflect insomnia severity, preoccupation with sleep, or dysfunctional beliefs about sleep in the linear regression analysis. In addition, ISI was expected by GSES (β = 0.67 in study I, β = 0.62 in study II, all p < 0.001) and DBS-2 (β = 0.16 in study II, p = 0.020), but not by the DBST index.Conclusions It was observed that the DBST index was not significantly associated with insomnia severity, preoccupation with sleep, or dysfunctional beliefs about sleep in two studies done among shift working-nursing professionals.

Cathode 개방형 고분자연료전지 스택 내구성 평가

유동근 ( Donggeun Yoo ),김현석 ( Hyeonsuck Kim ),오소형 ( Sohyeong Oh ),박권필 ( Kwon-pil Park ) 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.1

소형 이송형 고분자전해질 연료전지 (PEMFC)에 많이 사용되는 cathode 개방형 PEMFC 스택은 내구성이 약한 문제점이 있다. 13개의 셀로 이루어진 PEMFC 스택의 가속 내구성 평가를 통해 스택의 열화 원인을 찾고 cathode 개방형 스택의 내구성 향상에 기여하고자 하였다. Cathode가 대기에 개방되어 있고, 기밀 유지가 어려운 cathode 개방형 스택의 구조적 문제점 때문에 시동/정지 (SU/SD)시 수소/공기 경계가 형성되어 cathode를 열화시킨다. 본 연구에서는 cathode 개방형 스택에 SU/SD 1,800회 반복 후 초기 성능의 54%가 감소하여 비교적 짧은 시간에 내구성을 평가할 수 있었다. 스택 해체 후 각 셀을 2등분하여 성능분석하였다. 전체적으로 공기 유입이 용이한 anode 출구부 MEA가 유입부 MEA보다 전극 열화가 더 심해서 SU/SD시 수소/공기 경계 형성이 주요 열화 원인임을 확인했다. Cathode open-type PEMFC (Proton Exchange Membrane Fuel Cells) stacks, which are widely used in small transport-type PEMFC, have a problem with poor durability. Through the accelerated durability test of the 13-cell PEMFC stack, we tried to find the cause of the degradation of the stack and to contribute to the improvement of the durability of the cathode open stack. A hydrogen/air boundary is formed during start-up/shut-down (SU/SD) due to the structural problem of the cathode open stack in which the cathode is open to the atmosphere and it is difficult to maintain airtightness, thereby deteriorating the cathode. In this study, it was possible to evaluate the durability in a relatively short time by reducing the 54% of the initial performance by repeating SU/SD 1,800 times on the cathode open stack. After dismantling the stack, each cell was divided into two and the performance was analyzed. Overall, the anode outlet MEA, which facilitates air inflow, showed more severe electrode deterioration than the inlet MEA, confirming that the hydrogen/air boundary formation during SU/SD is the main cause of degradation.

순수 수소 공급조건에서 정치용 PEMFC MEA와 차량용 MEA 성능비교

오소형,이미화,이학주,김욱원,박정우,박권필,Oh, Sohyeong,Lee, Mihwa,Lee, Hakju,Kim, Wookwon,Park, Jeong-Woo,Park, Kwonpil 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.4

개질가스를 일반적으로 사용하는 정치용 PEMFC에 순수 수소를 공급했을 때 그 특성을 차량용 막과 전극 합체(MEA)와 비교하였다. 수소 공급량을 변화시키며 anode에서 수소공급량이 전체 성능에 미치는 영향을 비교하였다. 수소를 1.0~1.7 과잉(stoi.)범위에서 공급량을 변화시켰을 때 정치용이나 차량용 모두 OCV에 미치는 영향은 거의 없었다. 0.7 V에서 정치용 MEA의 전류밀도는 차량용보다 약 16% 높았다. 그리고 상대습도를 변화시키며 I-V 성능, 임피던스, LSV를 측정하였다. 상대습도 증가에 따라 OCV와 전해질 막 저항이 모두 감소하였다. 정치용 MEA의 수소투과도가 차량용보다 더 낮아 정치용 MEA의 전해질 막의 내구성이 차량용보다 더 높을 수 있음을 보였다. When pure hydrogen was supplied to the stationary PEMFC generally using the reforming gas, its characteristics were compared with the vehicle PEMFC. The effect of varying the amount of hydrogen supply to the anode on the overall performance was compared. The variation of hydrogen supply in the range of 1.0~1.7 excess (stoi.) had little effect on the OCV of stationary and vehicle MEA (Membrane and Electrode Assembly). At 0.7 V, the current density of the stationary MEA was about 16% higher than that of the vehicle MEA. I-V performance, impedance, and LSV were measured with varying relative humidity. Both OCV and electrolyte membrane resistances decreased with increasing relative humidity. The hydrogen permeability of the stationary MEA was lower than that of the vehicle MEA, showing that the durability of the stationary membrane could be higher than that of the vehicle membrane.

Space Diver : 조우형 햅틱 장치를 활용한 우주 공간 체험

정호석(Hoseok Jung),신지훈(Jihoon Shin),안수홍(Soohong Ahn),신동호(Dongho Shin),고경선(Gyungsun Go),조규형(Kyuhyung Cho),현지선(Giseon Hyun),한솔빈(Solbin Han),조소형(Sohyeong Cho),문소진(Sojin Moon),조혜원(Hewon Cho),김시원(Seaone kim) 한국HCI학회 2024 한국HCI학회 학술대회 Vol.2024 No.1