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Yim, Taeeun,Park, Min-Sik,Woo, Sang-Gil,Kwon, Hyuk-Kwon,Yoo, Jung-Keun,Jung, Yeon Sik,Kim, Ki Jae,Yu, Ji-Sang,Kim, Young-Jun American Chemical Society 2015 NANO LETTERS Vol.15 No.8
<P>User safety is one of the most critical issues for the successful implementation of lithium ion batteries (LIBs) in electric vehicles and their further expansion in large-scale energy storage systems. Herein, we propose a novel approach to realize self-extinguishing capability of LIBs for effective safety improvement by integrating temperature-responsive microcapsules containing a fire-extinguishing agent. The microcapsules are designed to release an extinguisher agent upon increased internal temperature of an LIB, resulting in rapid heat absorption through an in situ endothermic reaction and suppression of further temperature rise and undesirable thermal runaway. In a standard nail penetration test, the temperature rise is reduced by 74% without compromising electrochemical performances. It is anticipated that on the strengths of excellent scalability, simplicity, and cost-effectiveness, this novel strategy can be extensively applied to various high energy-density devices to ensure human safety.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-8/acs.nanolett.5b01167/production/images/medium/nl-2015-011675_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5b01167'>ACS Electronic Supporting Info</A></P>
가변속 압축기를 갖는 오일쿨러의 최적 PI 제어기 설계
권태은(Taeeun Kwon),정태영(Taeyoung Jeong),정석권(Seokkwon Jeong) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.12
An optimized PI controller design method is presented to promote the control performance of an oil cooler system for high precision machine tools. First, a transfer function model of the oil cooler system with a variable rotating speed compressor was obtained by the perturbation method as the first order system with a negligible dead time. Then, the closed-loop control system was described as the second order system with a zero. Its dynamic behaviors are mostly governed by characteristic parameters, the damping ratio, and the natural frequency which is incorporated in PI gains. Next, an optimum integral of the time-weighted absolute error (ITAE) criterion was applied to the second order system. The characteristic parameters can be determined by the given design specifications, percent overshoots and settling times and comparisons with the ITAE criterion. Hence, the PI gains were plainly identified in a deterministic way. Finally, the PI gains were fine-tuned to obtain desirable dynamics in real systems, considering the zero effect and parameter variations. The validity of the proposed method was proven by computer simulations and real experiments for selected cases.
Prevalence of the <i>CTNNB1</i> mutation genotype in surgically resected fibromatosis of the breast
Kim, Taeeun,Jung, Eun Ah,Song, Ji Young,Roh, Ji Hyeon,Choi, Jong Sun,Kwon, Jee Eun,Kang, So Young,Cho, Eun Yoon,Shin, Jung Hee,Nam, Suk‐,Jin,Yang, Jung Hyun,Choi, Yoon‐,La Blackwell Publishing Ltd 2012 Histopathology Vol.60 No.2
<P>Kim T, Jung E A, Song J Y, Roh J H, Choi J S, Kwon J E, Kang S Y, Cho E Y, Shin J H, Nam S‐J, Yang J H & Choi Y‐L (2012) <I>Histopathology</I>?<B>60,</B> 347–356 <B>Prevalence of the <I>CTNNB1</I> mutation genotype in surgically resected fibromatosis of the breast</B></P><P><B>Aims: </B> To investigate <I>CTNNB1</I> mutation and β‐catenin expression in resected breast fibromatosis and to identify potential molecular markers of fibromatosis of the breast.</P><P><B>Methods and results: </B> We selected 12 patients with fibromatosis of the breast who underwent surgical resection and were confirmed by histological examination. Ultrasonography findings for 10 patients were reviewed and only two cases were suspicious for fibromatosis on imaging. On core needle biopsy for pre‐operative diagnoses, only three cases were histologically suspicious for fibromatosis. Mutations in exon 3 of <I>CTNNB1</I> were detected by direct DNA sequencing in nine (75.0%) cases: all were c.121G>A (p.T41A), which was much more frequent in breast fibromatoses than in other soft tissue lesions. Nuclear β‐catenin expression was observed in all cases and the level of expression was higher in cases with mutation. In eight of nine cases, the matched biopsy specimen showed the same <I>CTNNB1</I> mutation status as the pre‐operative specimen.</P><P><B>Conclusions: </B> In the majority of cases, clinical presentation and breast imaging are highly suspicious for carcinoma. Definitive pre‐operative pathological diagnosis by core needle biopsy is difficult. <I>CTNNB1</I> mutation and nuclear β‐catenin expression are frequently detected in sporadic breast fibromatoses, suggesting their potential as a useful tool to distinguish breast fibromatoses from other neoplasms.</P>