http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Seongwoo Choi,Juhee Lee,Yeomyeong Lee,Pil Joo Kim,Ju-Sik Cho,Yong Hwa Cheong,Yo-Sup Rim,Sang Yoon Kim 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.4
Ethephon is one of the chemical stimulator of crop growth that is also considered as a structural analogue of coenzyme M (CoM), having a promising potential for methanogenic inhibitor. However, the effect of ethephon application on greenhouse gas (GHG) emissions under rice cultivation has not been studied yet. In this pot experiment, different levels of ethephon (0, 2.5, 5 and 10 ㎎ L<SUP>-1</SUP>) were applied at the presence or absence of manure compost as an organic amendment to study its effect on GHGs emissions in particular CH₄ and rice productivity during the cultivation. Application of ethephon effectively suppressed CH₄ emissions in particular the initial periods (ca. 3 weeks) right after the application as compared with control soil during rice cultivation, but did not significantly affect N₂O emissions. In addition, the maximum CH₄ reduction (82% reduction over control) was found at 10 ㎎ L<SUP>-1</SUP> ethephon application right after its addition for 3 weeks during rice cultivation. Rice productivity and yield properties were mainly affected by ethephon application, enhancing ripened grains and number of grains per panicle. Soil properties were not influenced by ethephon application except for available phosphate, which is probably due to enhanced root growth in rhizosphere soils. Conclusively, ethephon could be a new and pioneering amendment for reducing CH₄ emission in particular at the initial 3 weeks after the application without increasing other GHG emissions and enhancing rice productivity in paddy soils.
Salting Up of Chemically Modified Graphene to Assemble Large-Scale Transparent Conductive Films
Lee, Kyueui,Lee, Haeshin,Ryu, Seongwoo American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.11
<P>I report a method for assembling large-scale transparent conductive films (TCFs) through the phenomenon of 'salting up' of chemically modified graphene (CMG) in the presence of metallic salts. The method described herein was inspired by the well-known protein purification process, 'salting-out.' In contrast, addition of hydrophobic CMGs to the solution of a salt results in 'salting-up' of CMGs. Owing to the presence of the salt, dehydrated CMG flakes spontaneously form an extremely thin layer at the air-water interface. The salted-up CMGs spontaneously form an extremely thin layer of CMGs at air-water interface, which is a useful method to prepare a conducting film with an extremely largearea. This CMG film can be transferred to any other flexible substrate as a TCF film and be enlarged to a greater scale depending on size of air-water interface. I demonstrate a new way to fabricate TCF film that can be applied in the fabrication of large scale graphene-based electronic devices.</P>
Lee, Sunghoon,Jeon, Byungjoo,Kang, Taewook,Lee, Wunho,Malik, Afandi Mohammad,Park, Seongwoo,Lim, Jimin,Park, Boowon,Jeong, Yongseok,kim, Jongsu Elsevier 2018 Journal of luminescence Vol.196 No.-
<P><B>Abstract</B></P> <P>Green-emission Zn<SUB>2</SUB>SiO<SUB>4</SUB>:Mn<SUP>2+</SUP> powder phosphor was applied for powder electroluminescence device through a screen printing method. The EL device consisted of silver nanowires as top electrode, 6μm-thick Zn<SUB>2</SUB>SiO<SUB>4</SUB>:Mn<SUP>2+</SUP> phosphor layer, 45µm -thick BaTiO<SUB>3</SUB> dielectric layer, and metal bottom electrode. The EL device showed the strong 525nm green emission spectrum. Its luminance-voltage dependence showed the exponential increase, and its luminance-frequency dependence showed the linear increase and then saturation behavior. It is notable that its temperature dependence showed the constant behavior at lower temperature, and then the drastic rising pattern up to Curie temperature of the dielectric layer (~ 120°C), and then the thermal quenching trend. The maximum luminance was 0.96cd/m<SUP>2</SUP> where the power consumption was 250W/m<SUP>2</SUP> at 420Vp and 400Hz, and thus the luminous efficiency was 0.012lm/W.</P>
The Effects of Spatial Factors on the Incidence of Violent Crime in Korea, 2005-2015
Lee, Kyungjae,Choi, Eunji,Lee, Seongwoo Asian Society for Innovation and Policy 2021 Asian Journal of Innovation and Policy Vol.10 No.2
While many criminal studies have focused on the motivation of offenders and avoidance of victimization in the micro perspective, there have been a number of theoretical developments emphasizing space as a direct factor that influences the incidence of crime. The main purpose of this study is to analyze the effects of regional characteristics and violent crime incidence in Korea. Applying diverse spatial econometrics models that have less been utilized in the crime literature, this study finds an important association between spatial accessibility and crime incidence. The results suggest that the type of predominant business and the level of road accessibility affect the vulnerability of areas with respect to the incidence of violent crime. This study concludes with some important implications for urban planners and policymakers with respect to crime control and prevention.
Yeomyeong Lee,Seongwoo Choi,Juhee Lee,Hyerin An,Chang Hoon Lee,Pyoung Ho Yi,Seung Tak Jeong,Sang Yoon Kim 한국토양비료학회 2021 한국토양비료학회지 Vol.54 No.4
Enhancing soil carbon sequestration potential is one of the most important strategies to contribute to climate change mitigation. However, basic characteristics of soil organic matter (SOM) distribution and its decomposition rate in soils where fruits and vegetables are cultivated have rarely been investigated though this information is necessary for a better understanding of carbon sequestration. In this study, soil samples were collected from plastic film house fields cultivated for various fruits and vegetables including cucumber, Korean melon, pepper, and pumpkin. Soil chemical properties including characteristics of SOM distribution by chemical oxidizable organic fractions, and their decomposition rates by estimating soil respiration rate (Q10 value) via soil incubation were evaluated. Total carbon content in pepper soil showed highest (28.7 g kg<SUP>-1</SUP>) and followed by pumpkin (23.9 g kg<SUP>-1</SUP>), cucumber (17.6 g kg<SUP>-1</SUP>), and Korean melon (11.8 g kg<SUP>-1</SUP>). Highest Q10 value was observed in pepper cultivated soils (1.65) that could be comparatively sensitive for SOM degradation, and then followed by cucumber (1.42), pumpkin (1.36), and Korean melon (0.82). Labile carbon as easily available form was highest in pepper cultivated soils (20.7 g kg<SUP>-1</SUP>), and followed by pumpkin (18.0 g kg<SUP>-1</SUP>), cucumber (14.6 g kg<SUP>-1</SUP>), and Korean melon (9.9 g kg<SUP>-1</SUP>), showing significantly positive correlations with soil total and labile carbons. Our results provided useful information on SOM distribution and decomposition, which is necessary to manage and thus to further enhance carbon sequestration in soils.