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희박 예혼합 모형 가스터빈 연소기의 NOx 배출 및 온도특성
유혜연(Hyeyeon Ryu),이종호(Jongho Lee),전충환(Chunghwan Jeon),장영준(Youngjune Chang) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The results of experimental were carried out in na atmospheric pressure, dump combustor showing features of combustion instabilities. Flame structure and heat release rates were obtained from OH chemiluminescence image. Qualitative comparisons were made between line-integrated OH chemiluminescence image and Abel-transformed one. Local Rayleigh index distributions were also examined. To see the periodic behavior of oscillating flames, phase-resolved measurements were performed with respect to the pressure wave in the combustor. Results on system damping and driving characteristics were provided as a function of equivalence ratio. It also could be observed that phase resolved temperatures have been changed in a well-defined manner, while its difference between maximum and minimum reached up to 280K. These results would be expected to play an important role in better understanding of driving mechanism and thermo-acoustic interactions.
Sleep Reactivity and Sleep Efforts in Shift Workers
Yunjee Hwang,Hyeyeon Jang,Jooyoung Lee,Sehyun Jeon,Jichul Kim,Somi Lee,Seog Ju Kim 대한신경정신의학회 2023 PSYCHIATRY INVESTIGATION Vol.20 No.9
Objective The current study aimed to investigate the differences in sleep reactivity and sleep effort differs among late night shift workers (LSWs) and non-late night shift workers (non-LSWs), and non-shift workers (non-SWs).Methods In total, 6,023 participants (1,613 non-SWs, 3,339 LSWs, and 1,071 non-LSWs) were recruited. Non-SWs was defined as those who works at fixed schedules during standard daylight. LSWs was defined as who work late night hours (10 <sub>PM</sub>–6 <sub>AM</sub>), while non-LSWs was SWs who did not work during late night. All completed the Ford Insomnia Response to Stress Test (FIRST), the Glasgow Sleep Effort Scale (GSES), the Pittsburgh Sleep Quality Index (PSQI), the Epworth Sleepiness Scale (ESS), the Insomnia Severity Index (ISI), and the short-term Center for Epidemiologic Studies-Depression scale (CES-D) through online survey.Results LSWs and non-LSWs reported higher FIRST, GSES scores than non-SWs. In addition, LSWs reported higher FIRST, GSES scores than non-LSWs. FIRST scores were correlated with CES-D, PSQI, ISI, and ESS for LSWs, non-LSWs, and non-SWs alike. GSES scores were also correlated with CES-D, PSQI, ISI, and ESS for LSWs, non-LSWs, and non-SWs alike.Conclusion SWs showed higher sleep reactivity and sleep effort than non-SWs. LSWs had higher sleep reactivity and sleep effort than non-LSWs, and these variables are associated with insomnia, daytime sleepiness, and depressive symptoms. Our findings suggests that late night schedule, may increase sleep reactivity and sleep effort, which are associated with sleep and mood disturbances.
지방정부의 정책수단 선택에 영향을 미치는 요인에 관한 분석: 지역일자리 목표 공시제를 중심으로
전미선 ( Mi Sun Jeon ),정용찬 ( Yong Chan Jung ),강혜연 ( Hyeyeon Kang ) 중앙대학교 국가정책연구소 2017 국가정책연구 Vol.31 No.4
정책의 성공을 위해 수단의 중요성이 강조되고 있지만, 개념적 논의에 비해 구체적인 정책사례를 통해 수단의 선택에 영향을 미치는 요인에 대한 검토는 부족한 실정이다. 이에 본 연구는 지역일자리 목표 공시제의 지역별 정책수단선택에 대하여 Howlett(2005)이 제시한 정책하위시스템과 정부역량에 따른 정책선택 차이를 적용함으로써 우리나라 지역별 일자리 정책 선택에 영향을 미치는 맥락적 요인을 통계적으로 파악하고자 하였다. 우선, 군집분석을 이행하였으며 그 결과 통계적으로 유의미한 수준에서 정부역량과 정책하위시스템이라는 기준에 따라 4가지 유형으로 나뉘었다. 그리고 ANOVA 분석에서는 시장 또는 보조금 수단을 제외하고 직접일자리, 정보제공, 자발적 공동체 또는 가족 의존 수단에서는 각 집단별 차이가 통계적인 유의미성이 나타났다. 또한 각 수단 유형별 t-test를 한 결과, 정부역량이 높고 정책하위시스템이 복잡하지 않은 경우에는 직접일자리 창출의 예산 비중이, 정부역량이 낮고 정책하위시스템이 복잡한 경우에는 정보제공 수단의 예산 비중이 높다는 것이 통계적으로 유의미하게 도출되었다. 하지만, 그 외의 경우에는 Howlett(2005)의 이론적 모형과 결과가 상이하였다. 이를 통해 지방정부의 직접적인 예산이 투입되거나 관료제 조직을 활용하는 정책 수단에서만 정부의 역량과 정책하위시스템이라는 맥락적 요인이 고려된다는 점을 알 수 있었다. 본 연구는 정책수단의 선택에 관하여 우리나라 기초자치단체 수준에서 기술적인 논의를 보충하는 이론적, 실증적 연구를 시도했다는 점에서 의의가 있다고 할 수 있다. 그리고 지역의 고유한 맥락적 요인을 반영하여 정책수단의 합리적인 설계가 가능할 수 있도록 고용정책 환경에 대한 체계적인 검토 및 분석과 지역고용거버넌스의 활용과 같은 정책적 노력이 필요하다는 시사점을 도출해 볼 수 있었다. Although, the importance of developing and implementing employment policies in consideration of regional features has continued, the 'Disclosing System of Regional Job Creation' has been introduced, systematic research on this issue is lacking. So, this study focuses on the choice of ‘Disclosing system of Regional Job Creation’ policy instrument in Korea according to the model of Howlett(2005). To be more specific empirical studies, we conducted cluster analysis considering ‘the level of state capacity’ and ‘the level of policy-subsystem complexity’ which is the standard of the theoretical model of Howlett(2005). As a result, it can be divided into four groups at statistically significant level. In addition, we conduct ANOVA analysis and examine the difference of budget ratio between four groups, which is stated in the model of Howlett(2005). As a result, although we could find the difference among the four groups except for the ‘market or subsidy’ instrument, it was hard to examine empirically which instrument shows the largest ratio of the budget according to the four types of the government capacity and policy subsystem. To complement this, we conducted t-test. As a result of the t-test, if the government capacity is high and the policy subsystem is simple, the budget ratio of direct job creation is high at a statistically significant level. And if the government capacity is low and the policy subsystem is complicated, it is statistically significant that the budget of the information providing policy instrument is high. In other cases, however, the theoretical model of Howlett(2005) and the results were different. Through this, direct job creation and information providing instrument, which local government directly uses the bureaucracy or the government budget, the contextual factors such as government capacity and policy subsystem are rationally considered. Therefore, it was found that each region needs rational review or evaluation of the basis of the choice of instruments. In order to do this, it is possible to draw policy implications such as policy effort needed to identify the unique employment policy environment, establishing local employment governance.
Lee, Jihye,Park, Hyeyeon,Kwon, Hyuksu,Kwon, Gyemin,Jeon, Aeran,Kim, Hugh I.,Sung, Bong June,Moon, Bongjin,Oh, Han Bin American Chemical Society 2013 ANALYTICAL CHEMISTRY - Vol.85 No.15
<P>Peptide dissociation behavior in TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl)-based FRIPS (free radical initiated peptide sequencing) mass spectrometry was analyzed in both positive- and negative-ion modes for a number of peptides including angiotensin II, kinetensin, glycoprotein IIb fragment (296–306), des-Pro<SUP>2</SUP>-bradykinin, and ubiquitin tryptic fragment (43–48). In the positive mode, the ·Bz-C(O)–peptide radical species was produced exclusively at the initial collisional activation of <I>o</I>-TEMPO-Bz-C(O)–peptides, and two consecutive applications of collisional activation were needed to observe peptide backbone fragments. In contrast, in the negative-ion mode, a single application of collisional activation to <I>o</I>-TEMPO-Bz-C(O)–peptides produced extensive peptide backbone fragmentations as well as ·Bz-C(O)–peptide radical species. This result indicates that the duty cycle in the TEMPO-based FRIPS mass spectrometry can be reduced by one-half in the negative-ion mode. In addition, the fragment ions observed in the negative-ion experiments were mainly of the <I>a</I>-, <I>c</I>-, <I>x</I>-, and <I>z</I>-types, indicating that radical-driven tandem mass spectrometry was mainly responsible for the TEMPO-based FRIPS even with a single application of collisional activation. Furthermore, the survival fraction analysis of <I>o</I>-TEMPO-Bz-C(O)–peptides was made as a function of the applied normalized collision energy (NCE). This helped us to better understand the differences in FRIPS behavior between the positive- and negative-ion modes in terms of dissociation energetics. The duty-cycle improvement made in the present study provides a cornerstone for future research aiming to achieve a single-step FRIPS in the positive-ion mode.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2013/ancham.2013.85.issue-15/ac303517h/production/images/medium/ac-2012-03517h_0010.gif'></P>
실험실규모의 생물학적 이산화탄소 저감 및 메탄전환 공정 연구
이준철(Lee, Juncheol),김재형(Kim, Jaehyung),전혜연(Jeon, Hyeyeon),박홍선(Park, Hongsun),장원석(Chang, Wonseok),박대원(Pak, Daewon) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
최근 지구온난화로 인해 국제적으로 이산화탄소 저감에 대한 연구가 진행되고 있으며 특히, 이산화탄소의 분리 및 유용물질 전환 등의 다양한 방법에 대한 연구가 활발히 이루어지고 있다. 이산화탄소를 메탄으로 전환시키는 생물학적 반응은 acetotrophic methanogen, hydrogenotrophic methanogen 등의 미생물이 관여한다. 본 연구에서는 hydrogenotrohpic methanogen을 이용하여 메탄으로 전환하고자 하였다. 이를 위해 이산화탄소와 수소의 체류시간에 대한 연구를 진행하였으며, 선행 연구로 혐기성슬러지의 혼합배양균으로부터 hydrogenotrophic methanogen을 우점종화 하기 위해 고정층 반응기를 이용하여 이산화탄소와 수소 가스를 주입하여 고농도로 배양하였다. 그 결과, 반응기내의 이산화탄소의 메탄전환 균주로써 수소를 환원제로 이용하는 hydrogenotrophic methanogen이 배양되었음을 확인하였다. 이산화탄소와 수소가스의 체류시간에 따른 이산화탄소의 생물학적 메탄 전환 실험 결과, 약 4시간에서 이산화탄소의 저감률이 99%이었으며, 체류시간이 2시간, 1.5시간인 경우 이산화탄소의 저감률은 각각 71%, 68% 이었다.
Um, Ji Won,Choii, Gayoung,Park, Dongseok,Kim, Dongwook,Jeon, Sangmin,Kang, Hyeyeon,Mori, Takuma,Papadopoulos, Theofilos,Yoo, Taesun,Lee, Yeunkum,Kim, Eunjoon,Tabuchi, Katsuhiko,Ko, Jaewon American Society for Biochemistry and Molecular Bi 2016 The Journal of biological chemistry Vol.291 No.19
<P>Gephyrin is a central scaffold protein that mediates development, function, and plasticity of mammalian inhibitory synapses by interacting with various inhibitory synaptic proteins. Here, we show that IQSLC3, a guanine nucleotide exchange factor for ARE6, directly interacts with gephyrin, an interaction that is critical for the inhibitory synapse localization of IQSEC3. Overexpression of IQSEC3 increases inhibitory, but not excitatory, synapse density in a guanine nucleotide exchange factor activity-dependent manner. Conversely, knockdown of IQSEC3 decreases size of gephyrin cluster without altering gephyrin puncta density. Collectively, these data reveal that IQSEC3 acts together with gephyrin to regulate inhibitory synapse development.</P>