http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Lee, Soon Chang,Jeong, Yesul,Kim, Youn Jung,Kim, Hyeran,Lee, Hyun Uk,Lee, Young-Chul,Lee, Sang Moon,Kim, Hae Jin,An, Ha-Rim,Ha, Myoung Gyu,Lee, Go-Woon,Lee, Young-Seak,Lee, Gaehang Elsevier 2018 Journal of hazardous materials Vol.354 No.-
<P><B>Abstract</B></P> <P>In this study, hierarchically three-dimensional (3D) nanotubular sea urchin-shaped iron oxide nanostructures (3D-Fe<SUB>2</SUB>O<SUB>3</SUB>) were synthesized by a facile and rapid ultrasound irradiation method. Additives, templates, inert gas atmosphere, pH regulation, and other complicated procedures were not required. Dense 3D-Fe<SUB>2</SUB>O<SUB>3</SUB> with a relatively large Brunauer–Emmett–Teller (BET) surface area of 129.4 m<SUP>2</SUP>/g was synthesized within 23 min, and the BET surface area was further improved to 282.7 m<SUP>2</SUP>/g by a post heat-treatment process. In addition, this post processing led to phase changes from maghemite (γ phase) to hematite (α phase) Fe<SUB>2</SUB>O<SUB>3</SUB>. Subsequent characterization suggested that the growth mechanism of the 3D-Fe<SUB>2</SUB>O<SUB>3</SUB> follows self-assembly and oriented attachment. The prepared 3D-Fe<SUB>2</SUB>O<SUB>3</SUB> was applied to wastewater purification. Ultrasound-irradiated 3D-Fe<SUB>2</SUB>O<SUB>3</SUB> can eliminate a As(V) and Cr(VI) from water with 25 times faster removal rate by using a one third smaller amount than commercial α-Fe<SUB>2</SUB>O<SUB>3</SUB>. This was attributed to the inter-particle pores and relatively positively charged surface of the nanostructure. In addition, post heat treatment on ultrasound-irradiated 3D-Fe<SUB>2</SUB>O<SUB>3</SUB> significantly influenced the photocatalytic degradation of methylene blue and phenol, with a 25 times higher removal efficiency than that of commercial α-Fe<SUB>2</SUB>O<SUB>3</SUB>, because of both high BET surface area and good crystallization of the prepared samples.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The 3D- Fe<SUB>2</SUB>O<SUB>3</SUB> can be mass-produced by ultrasound irradiation method. </LI> <LI> The 3D-Fe<SUB>2</SUB>O<SUB>3</SUB> possesses high BET surface area and interconvertible phase. </LI> <LI> The 3D-Fe<SUB>2</SUB>O<SUB>3</SUB> exhibits rapid adsorption rates for heavy metals. </LI> <LI> The 3D-Fe<SUB>2</SUB>O<SUB>3</SUB> exhibits excellent photocatalytic activities toward the dyes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Mercury recovery from mercury-containing wastes using a vacuum thermal desorption system
Lee, Woo Rim,Eom, Yujin,Lee, Tai Gyu Elsevier 2017 Waste management Vol.60 No.-
<P><B>Abstract</B></P> <P>Mercury (Hg)-containing waste from various industrial facilities is commonly treated by incineration or stabilization/solidification and retained in a landfill at a managed site. However, when highly concentrated Hg waste is treated using these methods, Hg is released into the atmosphere and soil environment. To eliminate these risks, Hg recovery technology using thermal treatment has been developed and commercialized to recover Hg from Hg-containing waste for safe disposal. Therefore, we developed Hg recovery equipment to treat Hg-containing waste under a vacuum of 6.67kPa (abs) at 400°C and recover the Hg. In addition, the dust generated from the waste was separated by controlling the temperature of the dust filtration unit to 230°C. Additionally, water and Hg vapors were condensed in a condensation unit. The Hg removal rate after waste treatment was 96.75%, and the Hg recovery rate as elemental Hg was 75.23%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mercury was recovered from mercury-containing wastes. </LI> <LI> Highly efficient vacuum thermal desorption system for mercury recovery was developed. </LI> <LI> Separation effects of a dust filtration unit using a temperature gradient were investigated. </LI> <LI> Physicochemical characteristics of various mercury-containing wastes were analyzed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A Maximum Entropy-Based Bio-Molecular Event Extraction Model that Considers Event Generation
Lee, Hyoung-Gyu,Park, So-Young,Rim, Hae-Chang,Lee, Do-Gil,Chun, Hong-Woo Korea Information Processing Society 2015 Journal of information processing systems Vol.11 No.2
In this paper, we propose a maximum entropy-based model, which can mathematically explain the bio-molecular event extraction problem. The proposed model generates an event table, which can represent the relationship between an event trigger and its arguments. The complex sentences with distinctive event structures can be also represented by the event table. Previous approaches intuitively designed a pipeline system, which sequentially performs trigger detection and arguments recognition, and thus, did not clearly explain the relationship between identified triggers and arguments. On the other hand, the proposed model generates an event table that can represent triggers, their arguments, and their relationships. The desired events can be easily extracted from the event table. Experimental results show that the proposed model can cover 91.36% of events in the training dataset and that it can achieve a 50.44% recall in the test dataset by using the event table.
이규림(Lee Gyu-Rim),김영옥(Kim Young-Ok) 한국열린유아교육학회 2011 열린유아교육연구 Vol.16 No.5
본 연구에서는 다문화 교육에 대한 유아교사의 효능감이 전문적 성향과 어떠한 관계가 있으며 그 설명력은 어떠한지를 살펴보고자 하였다. 이를 위하여 유아교육기관교사 187명을 대상으로 다문화적 효능감과 전문적 성향을 측정하였으며 수집된 자료는 Pearson 적률상관계수를 구하고 회귀분석을 실시하였다. 연구결과, 유아교사의 다문화적 효능감은 전문적 성향과 정적 상관관계를 나타냈다. 또한 다문화적 효능감은 전문적 성향을 예측할 수 있는 변인으로 나타났다. 바람직한 유아 다문화 교육을 위해서는 먼저 교사가 다양성에 효과적으로 대처할 수 있다는 자신감이 중요하며 이를 기초로 적절한 환경을 조성하고 교육내용 및 방법, 자료 등을 선택함으로써 보다 전문적이고 효율적인 교육적 접근이 이루어져야 함을 시사한다. The purpose of this study was to analyze the relationship between early childhood teachers’ multicultural efficacy and professional disposition. The subjects were 187 teachers in early childhood institution in G city and J Province. The instruments of the study were the multicultural efficacy scale(general life, instructional function, and human relations) and the professional disposition scale(intelligent skill, professional autonomy, and service duty). The collected data were analyzed with SPSS Program, Pearson r and multiple regression analysis. The results of the study were as follows; First, early childhood teachers’ multicultural efficacy was positively related to professional disposition. In particular, there were significant relationships among general life and intelligent skill, instructional function & human relations and intelligent skill & professional autonomy. Second, early childhood teachers’ multicultural efficacy was the predicting variable in professional disposition. In conclusion, for a desirable multicultural approach, early childhood teachers need to enhance their multicultural efficacy for young children. Consequently, it is expected to promote early childhood teachers’ professional ability in multicultural environment.
다문화교육 개념 및 현장적용에 대한 유아교사의 인식 탐색
이규림 ( Gyu Rim Lee ),김영옥 ( Young Ok Kim ) 한국유아교육학회 2012 유아교육연구 Vol.32 No.4
본 연구는 다문화교육의 개념 및 현장적용에 대한 유아교사의 인식을 탐색해 봄으로써 유치원 또는 보육시설 현장에서 유아를 위한 다문화교육의 내실화 및 질적 향상을 도모하고자 하였다. 연구대상은 G시와 J도에 소재한 유치원 및 보육시설 교사 231명으로 이들에게 다문화교육에 대한 개념과 현장적용 즉, 교수-학습 원리, 활동주제, 활동유형, 교수-학습 방법 관련 문항에 답하도록 하고 그 자료를 수집하였다. 수집된 자료는 SPSS 19.0 프로그램을 이용하여 빈도분석을 실시하였다. 연구결과, 다문화교육의 개념에 대하여 유아교사들은 대체로 높은 수준의 인식을 가진 것을 알 수 있었다. 또한 다문화교육의 현장적용에 대한 유아교사의 인식은 그 세부항목인 교수-학습 원리, 활동주제, 활동유형, 교수-학습 방법 모두에서 전반적으로 높게 나타났다. 성공적인 유아다문화교육을 기대한다면 먼저 교사가 교육개념을 바르게 이해하고 이를 효과적으로 현장에 적용할 수 있는 전문적인 혜안과 교수 능력을 기르도록 지원해야 할 것이다. This study examines early childhood teachers` recognition of the conception of multicultural education and its application. The subjects, 231 early childhood teachers in G City and J Province, responded to questionnaires and the data obtained were analyzed using the SPSS 19.0 Program with Frequency Analysis. The results revealed the recognition of the conception of multicultural education by early childhood teachers was appropriate and reasonable. Also, their recognition was relatively high in terms of the application of multicultural education including teaching-learning principles, activities themes, activities types, teaching-learning skills. This study indicates that in order for multicultural education to be successful in early childhood settings, it is paramount that teachers first have a firm understanding of its concepts and principles so that their correct conceptualizations can guide and inform their application abilities.
Hyung‑Rim Lee,Myoung‑Gyu Lee,Namsu Park 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.10
The conventional stamping tube forming process generally includes expanding the tube, forming the end into a specificshape by pressing, and trimming the part. However, the manufacture of the tube parts based on these conventional formingprocesses causes significant material loss during the trimming process after shaping. On the other hand, incremental tubeforming (ITF) can reduce material loss in the entire forming process; therefore, it can be considered as an effective alternativeto the conventional tube forming process and a promising method for developing tube components without using apress. The hemispherical shaped tool tip, widely used in the existing incremental sheet forming, has, however, limitationsin forming complex-profiled tube parts. In this study, a novel tool tip is proposed to overcome the problem, and an S-shapedtube is successfully produced through the new ITF process. In addition, numerical analyses are conducted using the commercialFE package of Abaqus/Explicit to investigate the deformation mode during ITF. Finally, the feasibility of the novelITF process for tube forming is confirmed by comparing the geometric accuracy and thickness variation between the targetshape and the formed sample.