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음식물 폐기물류로 제조된 퇴비의 고형연료 가치 평가 연구
이경섭,장한별,정은지,도아름,하진욱 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2
In 2019, the daily generation of food waste in Korea was 14,314 tons, which is a steady increase compared to the past. To efficiently use food waste as an effective resource, composting and feeding are carried out. In Korea, attention is gradually focused on a sustainable resource circulation society. Compost made of food waste has problems with foreign substances, heavy metals, and salt content, and solid fuelization research is being actively conducted to compensate for this. In this study, infrared spectroscopy(FT-IR), organic content measurement(TGA), and chemical composition were measured to compare the fuel characteristics with wood pellets, which are major solid fuels, in order to examine the physical and chemical properties of food waste compost.
Identification of a New Fatty Acid from the Seeds of Coix lachryma-jobi var. ma-yuen
Han, Ah-Reum,Kil, Yun-Seo,Kang, Unwoo,Youn, I-Soo,Choi, Goeun,Lee, Yoo Jin,Nam, Joo-Won,Lee, Je-Hyun,Hong, Jongki,Lee, Sang Kook,Seo, Eun-Kyoung Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.4
Han, Changhee,Kim, Ah Reum,Hwang, Gunha,Kim, Rakhoon,Go, Woohyun,Lee, Ji Yeong,Lee, Jongbong,An, Soyon,Hwang, Tae Sung,Lee, Hee Chun The Korean Society of Veterinary Science 2022 大韓獸醫學會誌 Vol.62 No.1
A 10-year-old, spayed female, Doberman Pinscher dog presented with right forelimb lameness. On physical examination, painful reaction and crepitation were present at the right shoulder. Radiographic evaluation of the shoulder revealed nothing remarkable. On the ultrasonography of the right shoulder joint, 2 small echogenic masses accompanied by reverberation artifacts were observed in the right biceps tendon near its origin at the supraglenoid tuberosity. Based on these findings, we suspected biceps calcifying tendinopathy. Clinical signs resolved intermittently after administration of nonsteroidal anti-inflammatory drug. This study described the ultrasonographic findings of calcifying biceps brachii tendinopathy which is an unusual finding in dogs.
Study of Cu-X alloy seed layer on ITO for copper-plated silicon heterojunction solar cells
Lee, Sang Hee,Lee, Doo Won,Kim, Han Jun,Lee, Ah Reum,Lee, Soo Hong,Lim, Kyoung-jin,Shin, Won-suk Elsevier 2018 Materials science in semiconductor processing Vol.87 No.-
<P><B>Abstract</B></P> <P>For the reduction of optical loss and contact material cost in silicon heterojunction (SHJ) solar cells, copper plating has been considered as a suitable metallization technique. Usually, a metal seed layer is deposited on an indium tin oxide (ITO) prior to copper plating for adhesive contact between copper and ITO. As a requirement of suitable seed layer material, contact resistivity (ρ<SUB>c</SUB>) between the seed and the ITO is also important, as well as the adhesion, because high series resistance results in fill factor loss. In this study, we applied alloy seed layers which were deposited by co-evaporating copper with other metals (Cu-X). Contact resistivity values of the samples were extracted by using transfer length method (TLM). Also, tape tests were carried out to simply confirm the adhesion of contacts with different seed layers. Among the Cu-X alloy seed materials, the Cu-Ni alloy film resulted in good adhesion to the ITO as well as low average contact resistivity under 1 mΩ cm<SUP>2</SUP>.</P>
High-Performance Furan-Containing Conjugated Polymer for Environmentally Benign Solution Processing
Lee, Sang Myeon,Lee, Hae Rang,Han, A-Reum,Lee, Junghoon,Oh, Joon Hak,Yang, Changduk American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.18
<P>Developing semiconducting polymers that exhibit both strong charge transport capability via highly ordered structures and good processability in environmentally benign solvents remains a challenge. Given that furan-based materials have better solubility in various solvents than analogous thiophene-based materials, we have synthesized and characterized furanyl-diketopyrrolopyrrole polymer (PFDPPTT-Si) together with its thienyl-diketopyrrolopyr-role-based analogue (PTDPPTT-Si) to understand subtle changes induced by the use of furan instead of thiophene units. PTDPPTT-Si films processed in common chlorinated solvent exhibit a higher hole mobility (3.57 cm(2) V(-1)s(-1)) than PFDPPTT-Si films (2.40 cm(2) s(-1)) under the same conditions; this greater hole mobility is a result of tightly aggregated z stacking structures in PTDPPTT-Si. By contrast, because of its enhanced solubility, PFDPPTT-Si using chlorine-free solution processing results in a device with higher mobility (as high as 1.87 cm(2) s(-1)) compared to that of the corresponding device fabricated using PTDPPTT-Si. This mobility of 1.87 cm(2) V-1 s(-1) represents the highest performances among furan-containing polymers reported to the best of our knowledge for nonchlorinated solvents. Our study demonstrates an important step toward environmentally compatible electronics, and we expect the results of our study to reinvigorate the furan-containing semiconductors field.</P>
A Potential Cytotoxic Principle of Zingiber cassumunar
Han, Ah-Reum,Lee, Eun-Jin,Min, Hye-Young,Kim, Hyang-Rim,Lee, Sang Kook,Seo, Eun-Kyoung 梨花女子大學校 藥學硏究所 2003 藥學硏究論文集 Vol.- No.12
A bioassay-guided fractionation of the active chloroform extracts of the rhizomes of Zingiber cassumunar Roxb. led to the isolation of a potential cytotoxic principle, curcumin (1), along with two inactive compounds, (E)-4-(3',4'-dimethoxyphenyl)but-3-en-l-ol (2) and (E)-4-(3',4'-dimethoxyphenyl)but-3-en-l-yl acetate (3). Curcumin (1) showed a significant cytotoxicity against several human cancer cell lines (Col2; 2.30, A549; 12.30, SNU638; IC_(50) 18.80㎍/㎖).
Investigation of Metal Co-evaporated Copper Seed Layers for Copper-Plated Heterojunction Solar Cells
Lee, Sang Hee,Lee, Doo Won,Lee, Ah Reum,Kim, Han Jun,Lee, Soo Hong 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.
<P>For the reduction of optical loss and contact material cost in silicon heterojunction (SHJ) solar cells, copper plating has been considered as a suitable metallization technique. However, a plated copper contact on an indium-tin-oxide (ITO) generally has low a reliability of adhesion. For this reason, proper seed layer materials are required for adhesive copper plating. As a requirement for a suitable seed layer material, the contact resistance between the seed and the ITO is also important, as well as the adhesion, because high series resistance results in a low fill factor. In this research, we deposited a seed layer by co-evaporating copper with other metals (Cu-X). The contact resistivity (rho (c) ) of the Cu-X deposited on ITO was evaluated by using the transfer length method (TLM). In order to confirm the influence of the work function of the Cu-X, we measured the contact potential difference (CPD) by using photoemission in an air system (PAS). Moreover, phase and we analyzed the crystallite size by using X-ray diffraction (XRD) measurement.</P>
Enhancement of X-ray detection by single-walled carbon nanotube enriched flexible polymer composite
Han, Heetak,Lee, Sanggeun,Seo, Jungmok,Mahata, Chandreswar,Cho, Sung Hwan,Han, A-Reum,Hong, Keun-Sung,Park, Joon-Ho,Soh, Myung-Jin,Park, Cheolmin,Lee, Taeyoon Springer-Verlag 2014 NANOSCALE RESEARCH LETTERS Vol.9 No.1
<P><B>Abstract</B></P><P>Although organic-based direct conversion X-ray detectors have been developed, their photocurrent generation efficiency has been limited by recombination of excitons due to the intrinsically poor electrical properties of organic materials. In this report, we fabricated a polymer-based flexible X-ray detector and enhanced the X-ray detection sensitivity using a single-walled carbon nanotube (SWNT) enriched polymer composite. When this SWNT enriched polymer composite was used as the active layer of an X-ray detector, it efficiently separated charges at the interface between the SWNTs and polymer, preventing recombination of X-ray-induced excitons. This increased the photocurrent generation efficiency, as measured from current-voltage characteristics. Therefore, X-ray-induced photocurrent and X-ray detection sensitivity were enhanced as the concentration of SWNTs in the composite was increased. However, this benefit was counterbalanced by the slow and unstable time-dependent response at high SWNT concentrations, arising from reduced Schottky barrier heights between the active layer and electrodes. At high SWNT concentration, the dark current also increased due to the reduced Schottky barrier height, leading to decrease the signal-to-noise ratio (SNR) of the device. Experimental results indicated that 0.005 wt.% SWNT in the composite was the optimum composition for practical X-ray detector operation because it showed enhanced performance in both sensitivity and SNR. In mechanical flexibility tests, the device exhibited a stable response up to a bending radius of 0.5 cm, and the device had no noticeable change in diode current after 1,000 bending cycles.</P><P><B>PACS code</B></P><P>8.67.Sc</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1186/1556-276X-9-610) contains supplementary material, which is available to authorized users.</P>
Identification of a New Cytotoxic Biflavanone from Selaginella doederleinii
LEE, Na-Youn,MIN, Hye-Young,LEE, Jun,NAM, Joo-Won,LEE, Yoo-Jin,HAN, Ah-Reum,Adam WIRYAWAN,Wahyu SUPRAPTO,LEE, Sang Kook,SEO, Eun-Kyoung 이화여자대학교 약학연구소 2009 藥學硏究論文集 Vol.- No.19
A new biflavanone, 2,2˝,3,3˝-tetrahydrorobustaflavone 7,4´,7˝-trimethyl ether (1) was isolated from the whole plant of Selaginella doederleinii H_(IERON). (Selaginellaceae) together with the known biflavonoid, robustaflavone 7,4´,7˝-trimethyl ether (2) as the cytotoxic constituents against the three human cancer cell lines, HCT, NCI-H358, and K562. The structure of the new compound 1 was elucidated by spectral analysis including various 1D- and 2D-NMR experiments.
A New Flavanone Glycoside from the Dried Immature Fruits of Poncirus trifoliata
HAN, Ah-Reum,KIM, Jong-Bin,LEE, Jun,NAM, Joo-Won,LEE, Ik-Soo,SHIM, Chang-Koo,LEE, Kyung-Tae,SEO, Eun-Kyoung 이화여자대학교 약학연구소 2008 藥學硏究論文集 Vol.- No.18
A new flavanone glycoside, (2R)-5-hydroxy-4'-methoxyflavanone-7-0-{β-glucopyranosyl-(1->2)-β-glucopyranoside} (1), was isolated from the EtOAc extract of dried immature fruit of Poncirus trifoliata, together with three known compounds, (2S)-poncirin (2), (2S)-naringin (3), and (2S)-poncirenin (4). The structure of compound 1 was elucidated by spectroscopic data analysis, including 1D and 2D NMR experiments. Among the isolates, compound 2 exhibited considerable inhibitory activity against lipopolysaccharide (LPS)-induced prostaglandin E₂ (PGE₂) and interleukin-6 (IL-6) production, and mRNA expression in RAW 264.7 murine macrophage cells.