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유지수(Jisu Yu),한경식(Kyungsik Han) 한국HCI학회 2020 한국HCI학회 학술대회 Vol.2020 No.2
본 논문에서는 Parrott (2001)의 감정 모델을 기반으로 사용자 포스팅에 대한 다중 감정 분류 모델(분노, 두려움, 즐거움, 사랑, 슬픔)을 구축하였다. 본 연구는 제 3 자가 타인의 감정을 정의한 이전 연구들과 달리 글을 쓴 저자가 직접 명시한 500,000 개의 감정 정보를 활용하였다는 점에서 차별성을 갖는다. 또한, 문서 단위의 데이터로 모델을 구축해 단어들의 의미론적 관계와 글의 패턴을 기반으로 글 전체가 내포하는 감정을 유추하고 분류하였으며, 포스팅에서 글과 함께 쓰여진 emoji 를 데이터로 활용해 emoji 유무에 따른 모델의 성능을 비교하였다. 그 결과 글의 패턴을 학습하는 LSTM 모델이 57.4%로 가장 높은 성능을 보였으며, 특히 emoji 데이터가 포함될 때 모델의 성능이 58.3%로 향상되었다 (5 가지 감정 분류). 본 연구의 결과는 글 전체가 내포한 감정과 해당 감정을 표현하기 위해 사용된 단어의 감정이 일치하지 않음에도 저자가 표현하려고 했던 감정을 문서 단위에서 유추해냈다는 점에서 의미를 가지며, 이는 복잡한 감정 표현(e.g., 반어법, 은유법)에 대한 감정 분류의 가능성을 제시한다.
Analysis of microplastics in freshwater using thermal degradation method
Hye-Weon Yu(유혜원),Yun S. Kim(김윤석),SunHong Lee(이선홍),JiSu Yoo(유지수),Jaewon Choi(최재원) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Due to the high production and consumption of plastic worldwide, it has been drawn great attention on microplastics(MPs) entered the environment, especially the aquatic environment. The research scope of MPs in aqueous environment has been expanding from investigation of their presence in oceanic water to the analysis of their source, occurrence or fate in freshwater, as well as potential environmental or health risks. In recent years, questions concerning very small plastic particles, nanoplastics(NPs, 1~1000 nm), have emerged. Since the current spectroscopic analytical methods developed for microplastics have a particle size limitation and cannot reach the submicrometer range, mass spectrometry combined with thermal degradation appears to be a promising technique to meet these challenges. Thermal degradation allows the conversion of macromolecules into low molecular weight fragments, which are then separated by gas chromatography and identified by a mass detector(GC-MS). Due to the limited sample weight and the maximum operating temperature of the thin capillary of Pyrolysis-GC/MS, in this study we present an automated thermal extraction desorption(TED)-GC/MS with a separation of the thermal extraction process which is suited for the analysis of MPs and NPs in a freshwater samples.
알칼라인 수전해 산소 발생 반응을 위한 NiCo<sub>2</sub>O<sub>4</sub>/Ni foam 전극 제조 및 특성 평가
권민솔,고재성,이예솔,이성민,유지수,이효원,송성호,이동주,Kwon, Minsol,Go, Jaeseong,Lee, Yesol,Lee, Sungmin,Yu, Jisu,Lee, Hyowon,Song, Sung Ho,Lee, Dongju 한국분말재료학회 (*구 분말야금학회) 2022 한국분말재료학회지 (KPMI) Vol.29 No.5
Environmental issues such as global warming due to fossil fuel use are now major worldwide concerns, and interest in renewable and clean energy is growing. Of the various types of renewable energy, green hydrogen energy has recently attracted attention because of its eco-friendly and high-energy density. Electrochemical water splitting is considered a pollution-free means of producing clean hydrogen and oxygen and in large quantities. The development of non-noble electrocatalysts with low cost and high performance in water splitting has also attracted considerable attention. In this study, we successfully synthesized a NiCo<sub>2</sub>O<sub>4</sub>/NF electrode for an oxygen evolution reaction in alkaline water splitting using a hydrothermal method, which was followed by post-heat treatment. The effects of heat treatment on the electrochemical performance of the electrodes were evaluated under different heat-treatment conditions. The optimized NCO/NF-300 electrode showed an overpotential of 416 mV at a high current density of 50 mA/cm<sup>2</sup> and a low Tafel slope (49.06 mV dec<sup>-1</sup>). It also showed excellent stability (due to the large surface area) and the lowest charge transfer resistance (12.59 Ω). The results suggested that our noble-metal free electrodes have great potential for use in developing alkaline electrolysis systems.
담수 물환경 중 미세플라스틱 분석방법 및 검출에 대한 고찰
유혜원 ( Hye-weon Yu ),김윤석 ( Yun S. Kim ),이선홍 ( Sunhong Lee ),유지수 ( Jisu Yoo ),최재원 ( Jaewon Choi ) 한국환경분석학회 2020 환경분석과 독성보건 Vol.23 No.4
Theresearchscopeofmicroplasticsinaqueousenvironmenthasbeenexpandingfrominvestigationoftheirpresenceinoceanicwatertotheanalysisoftheirdistributionandbehaviorinfreshwater.However,researchinaqueousenvironmentislimitedbecausethelackofstandardizedevaluationtechniqueshasresultedintheuseofvariousunrelatedanalysismethods,thusmakingitdifficulttocomparedataonmicroplasticcontaminationanddistribution.Giventheirknownoceanicdistribution,asurveyontheoccurrenceofmicroplasticcontaminationandbehaviorinthefreshwaterenvironmentneedstobeconductedusingapreciseandaccuratestandardanalyticalmethod.Suchamethodwouldfacilitateasystematicanduniformapproachtodomesticandinternationalsafetymanagementandtothedevelopmentofimprovementplansneededtomitigatemicroplasticcontamination.Inthisstudy,wehavesummarizedthetechnologiesrecentlyappliedformicroplasticanalysisandfortheinvestigationofmicroplasticoccurrenceinthefreshwaterenvironment.Wehavealsopresentedareviewontheanalysisandevaluationofmicroplasticcontaminationinthefuture.