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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.
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.
명화를 활용한 창의적 발상표현활동이 유아의 정서지능과 창의성에 미치는 영향
이규림(Gyu Rim Lee) 한국열린유아교육학회 2015 열린유아교육연구 Vol.20 No.1
본 연구는 명화를 활용한 창의적 발상표현활동이 유아의 정서지능과 창의성에 미치는 영향을 살펴봄으로써 유아의 창의적 사고력 증진을 위한 효과적인 교수-학습 방법 에 대하여 탐색하고자 하였다. 이를 위하여 2013년 4월 첫 주부터 6월 둘째 주까지 총 10주에 걸쳐 전체 연구를 수행하였으며 이 중 8주간 주 2회씩 총 16회의 실험처 치를 실시하였다. 만 5세 유아 40명을 대상으로 실험집단에는 명화를 활용한 창의적 발상표현활동을, 비교집단에는 명화를 감상하고 미적요소를 탐색하는 미술활동을 실 시하였다. 효과를 검증하기 위하여 정서지능과 창의성 검사도구를 활용하였으며 수집 된 자료를 분석하고자 t 검증을 실시하였다. 연구결과, 명화를 활용한 창의적 발상표 현활동에 참여한 실험집단이 비교집단보다 정서지능 및 창의성에서 유의미하게 높은 점수를 나타냈다. 또한 하위요인에 있어서도 실험집단이 비교집단보다 통계적으로 의 미 있는 차이를 보였다. 이러한 결과를 토대로 유아의 창의적 사고력을 향상시킬 수 있는 매체와 방법으로서의 명화 활용의 가능성과 창의적 발상표현활동의 의의에 대하 여 논하였다. This study examines how young children``s emotional quotient and creativity are affected by creative idea expression activities through fine arts. The subjects are 40 five-year-olds, half of whom are enrolled in A Kindergarten (experimental group) and the other half in B Kindergarten (comparative group) located in G city. From April 2nd to June 1st, the experimental group carried out creative idea expression activities with fine arts 2 times a week for 8 weeks, for a total of 16 times. The comparative group carried out general art activities watching the same fine arts. In addition, two instruments were used: Emotional Quotient Scale and Creativity Test. Data from the results of pre-test and post-test were analyzed with t-test using SPSS 21.0. The results show that the experimental group exposed to creative idea expression activities with fine arts significantly outperformed the comparative group in emotional quotient and creativity. Also, a statistically significant difference is observed between the experimental and comparative groups, even in the sub-factors, except for teacher-young children relationship of emotional quotient. This study is meaningful in that it provides opportunities for young children to promote their emotional ability and creativity by expressing creative idea with fine arts.
A Maximum Entropy-Based Bio-Molecular Event Extraction Model that Considers Event Generation
( Hyoung Gyu Lee ),( So Young Park ),( Hae Chang Rim ),( Do Gil Lee ),( Hong Woo Chun ) 한국정보처리학회 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 biomolecular 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.