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Economies of Scale with Aggregate Data in Korean Rice Farms
( Kim,Taeyoon ) 한국농업경제학회 2016 농업경제연구 Vol.57 No.3
This study focuses on examining economies of scale for Korean rice farms with panel and group aggregate data from 1990 to 2013. Groupwise heteroskesasticity is considered in the translog cost function. Cost elasticities with respect to output range from 0.798 to 0.884 at the average level in reasonable farm size so that economies of scale is existed. However, the benefits from increasing farm size measured by logarithmic value of cost differences between farm size groups are decreased when farm size of 2.0~2.5 ha moves to that of 2.5~3.0 ha and even more.
Economies of Scale with Aggregate Data in Korean Rice Farms
( Kim,Taeyoon ) 한국농업경제학회 2016 KOREAN JOURNAL OF AGRICULTURAL ECONOMICS(KJAT) Vol.57 No.3
This study focuses on examining economies of scale for Korean rice farms with panel and group aggregate data from 1990 to 2013. Groupwise heteroskesasticity is considered in the translog cost function. Cost elasticities with respect to output range from 0.798 to 0.884 at the average level in reasonable farm size so that economies of scale is existed. However, the benefits from increasing farm size measured by logarithmic value of cost differences between farm size groups are decreased when farm size of 2.0~2.5 ha moves to that of 2.5~3.0 ha and even more.
Optogenetic control of endogenous Ca<sup>2+</sup> channels in vivo
Kyung, Taeyoon,Lee, Sangkyu,Kim, Jung Eun,Cho, Taesup,Park, Hyerim,Jeong, Yun-Mi,Kim, Dongkyu,Shin, Anna,Kim, Sungsoo,Baek, Jinhee,Kim, Jihoon,Kim, Na Yeon,Woo, Doyeon,Chae, Sujin,Kim, Cheol-Hee,Shin, Nature Publishing Group, a division of Macmillan P 2015 Nature biotechnology Vol.33 No.10
Calcium (Ca<SUP>2+</SUP>) signals that are precisely modulated in space and time mediate a myriad of cellular processes, including contraction, excitation, growth, differentiation and apoptosis. However, study of Ca<SUP>2+</SUP> responses has been hampered by technological limitations of existing Ca<SUP>2+</SUP>-modulating tools. Here we present OptoSTIM1, an optogenetic tool for manipulating intracellular Ca<SUP>2+</SUP> levels through activation of Ca<SUP>2+</SUP>-selective endogenous Ca<SUP>2+</SUP> release−activated Ca<SUP>2+</SUP> (CRAC) channels. Using OptoSTIM1, which combines a plant photoreceptor and the CRAC channel regulator STIM1 (ref. 4), we quantitatively and qualitatively controlled intracellular Ca<SUP>2+</SUP> levels in various biological systems, including zebrafish embryos and human embryonic stem cells. We demonstrate that activating OptoSTIM1 in the CA1 hippocampal region of mice selectively reinforced contextual memory formation. The broad utility of OptoSTIM1 will expand our mechanistic understanding of numerous Ca<SUP>2+</SUP>-associated processes and facilitate screening for drug candidates that antagonize Ca<SUP>2+</SUP> signals.
( Taeyoon Kim ),( Hyun Kyung Kwak ),( Chul-ho Oack ),( Jehun Kim ),( Taeyun Kim ),( Sungweon Ryoo ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
There have been attempts to use biological samples other than sputum for the diagnosis of TB. Urine is promising clinical specimen because of its availability, ease of access, processing and storage, and the low infection risk to healthcare workers during sample collection. In this study, we evaluated the thresholds of trans-renal (tr) DNA detection in patients with MDR, XDR pulmonary tuberculosis compared with artificially synthesized Mycobacterium tuberculosis (M.TB)-specific DNA. During the study cell free DNA urine preserve was added quickly in order to minimize degradation of soluble DNA by nucleases and adapted highly efficient isolation method for circulating cell free DNA isolation. We designed artificial double strand of M.TB bacilli and used it as control DNA. The artificially synthesized control DNA, trDNA extracted from M.TB H37Rv strain and patients’ urine were serially diluted and then the copy number were calculated using droplet digital PCR system. The quantitative value of M.TB-specific trDNA extracted from 10 MDR, XDR TB patients were confirmed by gene amplification technology. The detection efficiencies of our trDNA isolation outcomes were compared and quantify the total fraction, an average yield of >10-4 pg/㎕ was detected. Urine samples are increasingly used for TB diagnosis. However, extraction and concentration of trDNA is necessary for many molecular detection strategies. Since urine samples typically have large volumes with dilute M.TB specific trDNA concentrations making them prone to false negatives. In this study, we established a method of extracting trDNA from urine and a control DNA standard that can quantify very small amounts of trDNA. The detection of M.TB trDNA from urine specimen is a promising method not only for the diagnosis TB but also to assess treatment responses.
알카리 금속을 배재한 단결정 실리콘 태양전지의 텍스쳐링 공정
김태윤(Kim, Taeyoon),김회창(Kim, Hoechang),김범호(Kim, Bumho) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Mono-crystalline silicon solar cell is fabricated by using alkali metals. These alkali metal, used in wet etching process, must be removed for the high efficiency solar cell. As wet etching process has been adapted due to its low cost. But lots of alkali metals like potassium remains on the silicon surface and acts as impurities. To remove these alkali metals many of cleaning process have to be applied when solar cell manufacturing process. In terms of alkali metal removal, modified etchant solution is required for concise cleaning process. In this paper ethylenediamine was used and proposed for the substituion of postassium hydroxide.
Visible Light-Erasable Oxide FET-Based Nonvolatile Memory Operated with a Deep Trap Interface
Kim, Taeyoon,Lim, Jung Wook,Lee, Seong Hyun,Na, Jeho,Jeong, Jiwoon,Jung, Kwang Hoon,Kim, Gayoung,Yun, Sun Jin American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.31
<P>A new concept of a tunneling oxide-free nonvolatile memory device with a deep trap interface floating gate is proposed. This device demonstrates a high on/off current ratio of 10<SUP>7</SUP> and a sizable memory window due to deep traps at the interface between the channel and gate dielectric layers. Interestingly, irradiation with 400 nm light can completely restore the program state to the initial one (performing an erasing process), which is attributed to the visible light-sensitive channel layer. Device reproducibility is enhanced by selectively passivating shallow traps at the interface using in situ H<SUB>2</SUB> plasma treatment. The passivated memory device shows highly reproducible memory operation and on-state current during retention bake tests at 85 °C. One of the most significant advantages of this visible light-erasable oxide field-effect transistor-based nonvolatile memory is its simple structure, which is free from deterioration due to the frequent tunneling processes, as compared to conventional nonvolatile memory devices with tunneling oxides.</P> [FIG OMISSION]</BR>
An Interactive Object For Nudging To Reduce The Overuse of Video Streaming Services
Taeyoon Kim,Kyungho Lee 한국디자인학회 2021 한국디자인학회 학술발표대회 논문집 Vol.2021 No.5
From examining human time recognition process, Time-frame the frame can deliver time-related data to users in a psychologically familiar way was suggested. If data is displayed in a appropriate cognitive process and in a more natural way, and objects that can be empathized are visualized, it is assumed to be possible to expect a long-term change in habits by delivering messages as well as simple behavior induct-on to users.
Kim, Taeyoon,Cho, Young-Ho Royal Society of Chemistry 2011 Lab on a chip Vol.11 No.10
<P>This paper presents a pumpless cell culture chip, where a constant-rate medium perfusion is achieved by balanced droplet dispensing. Previous pumpless cell culture chips, where the gravity-driven flow is induced by gradually decreasing the hydraulic-head difference, Δ<I>h</I>, between source and drain reservoirs, result in a decreasing perfusion-rate. However, the present pumpless cell culture chip, where autonomous droplet dispensers are integrated on the source reservoirs, results in a constant perfusion-rate using a constant Δ<I>h</I> maintained by balanced droplet dispensing between the source-inlet and the drain-outlet. In the experimental study, constant perfusion-rates of 0.1, 0.2, and 0.3 μl min<SUP>−1</SUP> are obtained by Δ<I>h</I> of 38, 76, and 114 mm, respectively. At the constant perfusion-rate (<I>Q</I> = 0.2 μl min<SUP>−1</SUP>), H358 lung cancer cells show the maximum growth-rate of 57.8 ± 21.1% d<SUP>−1</SUP>, which is 1.9 times higher than the 30.2 ± 10.3% d<SUP>−1</SUP> of the static culture. At a perfusion-rate varying between 0.1–0.3 μl min<SUP>−1</SUP> (average = 0.2 μl min<SUP>−1</SUP>), however, the H358 cells show a growth-rate of 46.9 ± 8.3% d<SUP>−1</SUP>, which is lower than that of the constant <I>Q</I> of 0.2 μl min<SUP>−1</SUP>. The constant-rate perfusion culture (<I>Q</I> = 0.1, 0.2, and 0.3 μl min<SUP>−1</SUP>) also results in an average cell viability of 89.2%, which is higher than 75.9% of the static culture. This pumpless cell culture chip offers a favorable environment to cells with a high growth-rate and viability, thus having potential for use in cell-based bio-assays.</P> <P>Graphic Abstract</P><P>This paper presents a pumpless cell culture chip, where a constant-rate medium perfusion is achieved by balanced droplet dispensing. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1lc20234k'> </P>