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분말 바이오-숯으로부터 중금속 오염수 처리용 바이오-숯 비드 제조 및 적용
최유림,노훈,이규범,신복수,주완호,김남국,김진홍,양재규,조성희,장윤영,Choi, Yu-Lim,Roh, Hoon,Lee, Kyu-Beom,Shin, Bok-Su,Joo, Wan-Ho,Kim, Nam-Kook,Kim, Jin-Hong,Yang, Jae-Kyu,Reddy Koduru, Janardhan,Cho, Sung-Heui,Chang, Yoon-Young 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.6
In this study, biochar-bead, prepared from biochar powder derived from woody biomass, was used for removal cadmium ion in aqueous solution. Various mixing ratios of alginate solution and biochar powder were used for the production of round shape biochar-bead. An optimum mixing ratio was selected as 1.5% alginate solution and 20 wt% biochar. The produced biochar-bead was characterized by SEM, FT-IR, and XRD analyses. The adsorption capacity of Cd(II) by biochar-bead was found to be 9.72 mg/g which was higher than that by GAC and PAC. According to this study, round shape biochar-bead is expected to be used as a media for reactive barrier or water filtration.
고빈도 경피신경전기자극의 자극강도에 따른 정상 성인여성 교감신경성 반응의 변화
최유림,이정우,Choi, Yoo-Rim,Lee, Jeong-Woo 대한물리치료학회 2010 대한물리치료학회지 Vol.22 No.1
Purpose: The purpose of this study was to investigate the change in sympathetic nervous system responses of healthy adult women with changes in stimulus intensity of high frequency transcutaneous electrical nerve stimulation. Methods: Twenty-four healthy subjects (women) received high frequency electrical stimulation of the forearm. The subjects were randomly assigned to one of two groups; a low intensity stimulation group (n=12) and a high intensity stimulation group (n=12). The electrode attachment was arranged on the forearm of the dominant arm and the electricity stimulus time was 20 minutes. Measured items included skin conductance, pulse rate, skin temperature, and respiration rate. Each was measured at 4 times. Results: Skin conductance and skin temperature showed significant group by time interactions, though there were no significant group and time effects. There were no significant differences according to time, group effect, and a group by time interaction in pulse and respiration rates. Conclusion: High frequency and high intensity electrical stimulation may be helpful for the improvement of sudomotor function through the activation of the sympathetic nervous system. Also, high frequency and low intensity electrical stimulation may be helpful for the reduction of sudomotor function via inhibition of the sympathetic nervous system.
One-pot 합성 방법을 이용한 나노 철입자가 담지된 폐목재 기반 하이드로차의 제조 및 특성 평가
최유림,김동수,안혜영,박광진,양재규,장윤영,Choi, Yu-Lim,Kim, Dong-Su,Angaru, Ganesh Kumar Reddy,Ahn, Hye-Young,Park, Kwang-Jin,Yang, Jae-Kyu,Chang, Yoon-Young 한국지하수토양환경학회 2020 지하수토양환경 Vol.25 No.1
In this study, iron nanoparticles impregnated hydrochar (FeNPs@HC) was synthesized using lignocellulosic waste and simple one-pot synthetic method. During hydrothermal carbonization (HTC) process, the mixture of lignocellulosic waste and ferric nitrate (0.1~0.5 M) as a precursor of iron nanoparticles was added and heated to 220℃ for 3 h in a teflon sealed autoclave, followed by calcination at 600℃ in N<sub>2</sub> atmosphere for 1 h. For the characterization of the as-prepared materials, X-ray diffraction (XRD), cation exchange capacity (CEC), fourier transform infrared spectrometer (FT-IR), Brunauer-Emmett-Teller (BET), transmission electron microscope (TEM), Energy Dispersive X-ray Spectroscopy (EDS) were used. The change of Fe(III) concentration in the feedstock influenced characteristics of produced FeNPs@HC and removal efficiency towards As(V) and Pb(II). According to the Langmuir isotherm test, maximum As(V) and Pb(II) adsorption capacity of Fe<sub>0.25</sub>NPs@HC were found to be 11.81 and 116.28 mg/g respectively. The results of this study suggest that FeNPs@HC can be potentially used as an adsorbent or soil amendment for remediation of groundwater or soil contaminated with arsenic and cation heavy metals.
인산 개질 바이오차와 레드머드를 이용한 비소 및 중금속 복합 오염토양 안정화
최유림 ( Yu-lim Choi ),김동수 ( Dong-su Kim ),김세희 ( Se-hee Kim ),강태준 ( Tae-jun Kang ),도지영 ( Ji-young Do ),박광진 ( Gwang-jin Park ),양재규 ( Jae-kyu Yang ),장윤영 ( Yoon-young Chang ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2021 No.-
토양안정화기술은 토양 중 오염물질을 제거하여 함유량을 감소시키는 기존 공법과는 달리 안정화제를 오염 토양에 주입함으로써 오염물질을 안정화된 형태로 변환시켜 이동성 및 생물유효도를 저감시키는 기술이다. 토양안정화기술은 준금속 및 중금속 오염 토양에 적용이 가능하며 빠르고 간편하게 적용할 수 있으며 토양의 특성, 생태적 기능 및 부지의 용도를 유지할 수 있는 위해도 기반의 토양 오염복원기술로 알려져 있다. 레드머드는 보크사이트(bauxite) 제조 과정에서 발생하는 부산물로서 수 마이크로미터의 입자크기에 형태에 다량의 Fe<sub>2</sub>O<sub>3</sub>와 Al<sub>2</sub>O<sub>3</sub> 성분을 보유하며 강알칼리성을 가지고 있는 물질이다. 강알칼리성의 특성으로 인해 산성 오염 토양 등에 적용될 수 있으나 적용 비율이 높아지는 경우에는 토양의 pH가 작물이 밭토양의 적정 pH 보다 더 높아질 수 있다. 한편 바이오차(biochar)는 고온과 산소가 제한된 조건에서 바이오매스(biomass)를 통해 얻어지는 물질로서 높은 pH, 비표면적, 산소함유관능기를 보유하고 있어 수처리 또는 토양안정화 분야에서 널리 이용되고 있는 물질이다. 최근에는 비표면적을 넓히고 표면의 특성을 개질하거나 탄화의 필요한 온도를 낮출 수 있는 화학적 활성화 방법을 이용한 바이오차 제조가 여러 연구자들에 의해 진행되고 있다. 본 연구에서는 비소와 중금속으로 오염된 복합오염토양의 안정화를 위해 인산으로 개질된 바이오차와 레드머드를 적용하였다. 인산으로 개질된 바이오차와 레드머드의 안정화 효과를 확인하기 위해 적용 2주 후의 토양의 이화학적 특성 변화를 분석하고 비소 및 중금속 용출 시험을 실시하였다.
최유림(Yoolim Choi) 충청남도역사문화연구원 2022 충청학과 충청문화 Vol.33 No.1
신라가 한강 유역을 차지한 이후 백제와 고구려의 전쟁은 소강상태에들어간다. 삼국사기 등의 사료에서는 4회에 걸친 두 나라의 전쟁을기록하고 있다. 이글은 백제와 고구려 사이 신라가 있는 상황에서 백제와 고구려가 어떻게 전쟁을 했을 지에 대한 의문에서 시작되었다. 6세기 중후반 이후 백제・고구려의 군사적 충돌은 7세기 두 나라의 우호를이해하는데 선결조건이라는 점에서 중요하다. 이글에서는 4차례 충돌가운데 마지막 충돌인 607년 당시, 고구려가 백제의 송산성과 석두성을차례로 공격하고 백제 백성 3천 명을 사로잡아 돌아간 원인과 경과를고찰하였다. 고구려는 신라의 북쪽 변경도 침략하여 8천 명을 사로잡아갔다. 이 시기 고구려는 598년 수나라와 한차례 대규모 전쟁 이후 긴장관계가 지속되었다. 돌궐 계민의 장막에서 고구려 사신과 수 양제가 만나면서 두 나라의 전쟁 분위기가 고조되었다. 고구려는 백제와 신라의백성들을 동원하여 병사, 축성 등 군사 분야에서 활용하고자 했을 것으로 여겨진다. 한편 신라는 한강 유역을 차지한 이후 州를 설치하고 중국으로 사신을 파견하는 등 한강 유역에서 영향력을 행사하였다. 다만 고구려와 국경을 접하면서 한강하류 및 서해안 일대에서의 지배권은 공고하지 않았던 것으로 생각된다. 백제 송산성과 석두성은 현재 충청남도 서북단인 당진 일대로 비정된다. 이 지역은 아산만을 사이에 두고경기도와 접하고 있다. 고구려는 신라의 영향력이 서해안 일대까지 이르지 못한 조건과 서해안의 자연적 조건을 활용하여 백제를 공격할 수있었다고 생각된다. After Silla took over the Han River basin, the war between Baekje and Goguryeo entered a lull. Historical records such as Samguksagi(三國史記)record four wars between the two countries. This article began with questions about how Baekje and Goguryeo would have fought in the presence of Silla between Baekje and Goguryeo. Since the mid-to-late 6th century, the military conflict between Baekje and Goguryeo is importan tthat it is a prerequisite for understanding the friendship between the two countries in the 7th century. This article considered the case in which Goguryeo attacked Songsanseong and Seokduseong in Baekje and captured 3,000 Baekje’s people in 607, the last of the four collisions. Goguryeo also invaded the northern border in Silla, capturing 8,000 people. During this period, Goguryeo continued to have tension after a large-scale war with the Sui Dynasty in 598. The war atmosphere between the two countries heightened as Goguryeo envoys and Suyangje met in the tent of the stone palace gyemin. Goguryeo is believed to have mobilized the people of Baekjeand Silla to use them in military fields such as soldiers and fortresses. Meanwhile, after taking over the Han River basin, Silla exerted influence in the Han River basin by establishing a state and sending envoys to China. However, it is believed that the control of the lower reaches of the Han River and the west coast along the border with Goguryeo was not announced. Songsanseong and Seokduseong in Baekje are currently desig-nated as Dangjin area, the northern end of Chungcheongnamdo. The are ais in contact with Gyeonggi-do with As anman Bay in between. Goguryeo is believed to have been able to attack Baekje by utilizing the conditions in which Silla’s influence did not reach the west coast and the natural conditions of the west coast.
최유림(Choi, Yoo-Rim),김민정(Kim, Min-Jung),전정윤(Chun, Chung-Yoon) 한국실내디자인학회 2013 한국실내디자인학회 학술대회논문집 Vol.2013 No.11
The purpose of this study is to examine the effect of indoor temperature on occupants’ attention skill for a thermal space design. To achieve the purpose, differences of occupants" attention affected by the indoor temperature were verified and occupants’ attention skills changed with time were analyzed. The temperature of chamber was controlled according to two levels. A slightly cool level was 20.5℃ and a neutral temperature level was 24.0℃. Subjects were 32 healthy males aged 21 to 29. They didn’t have any medical history of neuropsychiatric disorders. All subjects had academic performance for 70 minutes when their electroencephalograms (EEGs) were measured in each two different thermal environment. Brain waves were measured on seven spots (Fp1, Fp2, T3, T4, Cz, Fz, Pz) of the frontal lobe, the temporal lobe and the parietal lobe. Brain waves were sorted out according to the frequency using power spectrum analysis, and then that were used for the attention ((SMR+M.Beta)/Theta) analysis and the relative power analysis. As the result, a slightly cool thermal environment would be better than a neutral thermal environment for the occupants who perform the attention task. Thus, that result could be considered for children"s study rooms in a house, classrooms in a school, and working spaces in an office.
실내 온도가 재실자의 주의집중력에 미치는 영향에 관한 연구
최유림(Choi Yoo-Rim),전정윤(Chun Chung-Yoon) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.12
The purpose of this research is to investigate how the indoor temperature has influence on occupants' attention abilities as a basis of productivity. To achieve the purpose, the experiment in climate chamber was conducted. In the experiment, temperature was controlled according to two levels (20 degree C or 23 degree C) and other factors were controlled uniformly. All of subjects were exposed to those two different thermal conditions. Each participant was asked to mark their answers on the state of attention measurement sheets (FAIR and Trail making test), in two conditions. Total 60 data were conducted. The main results are as follows. First, subjects showed the better attention abilities in relation to Q score at 20 degree C. But on the other hand attention abilities in relation to C score were higher at 23 degree C. Second, the attention skill to control obstructions was showed well at 20 degree C.