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Choi, Yoon-Young,Hong, Jongin,Leem, Dong-Seok,Park, Moonkyu,Song, HanWook,Sung, Tae-Hyun,No, Kwangsoo Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.13
<P>We demonstrate spin-cast ultrathin poly(vinylidene fluoride-<I>co</I>-trifluoroethylene), P(VDF-TrFE), films on flexible and transparent substrates. Importantly, the PEDOT:PSS electrode allowed for the superior piezoresponse value (17.14 ± 2.37 pm V<SUP>−1</SUP>) and the low coercive voltage (1.76 ± 0.79 V) of the 20 nm thick P(VDF-TrFE) films. The use of PEDOT:PSS allows for the coherent interface between PEDOT:PSS and P(VDF-TrFE), the strong adhesion at the interface and no interfacial interaction when compared to that of indium–tin oxide (ITO).</P> <P>Graphic Abstract</P><P>We have successfully fabricated spin-coated ultrathin poly(vinylidene fluoride-<I>co</I>-trifluoroethylene) films on flexible, transparent and conductive substrates for future plastic electronics. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm03533e'> </P>
Choi, Sung-Hee,Kim, Il-Doo,Dhungana, Sanjeev Kumar,Park, Kwangsoo Korean Society of Food Science and Technology 2019 한국식품과학회지 Vol.51 No.6
Of all the various types of tea that are available, Pu-erh tea has attracted much attention because of its healthpromoting effects. The objective of this study was to investigate the physicochemical and antioxidant properties of two types of Pu-erh tea, Gushu Pu-erh and typical Pu-erh, extracted at 80 and 100℃, respectively. The Gushu Pu-erh extracts showed lower pH but higher antioxidant potential at both the temperatures, as compared to the typical Pu-erh. The mineral content of the tea extracts was greater at 100℃ than at 80℃. Among the seven categories of the flavor compounds that were detected, the peak area of esters was the highest in the Gushu Pu-erh extracts. The type of tea and the extraction temperature significantly affected the physicochemical and functional properties of these tea extracts. This study revealed that Gushu Pu-erh extracted at 100℃ for 3 min with 30 s of shaking provides better results in terms of the antioxidant potential and mineral content.
Choi, Myoung-Hwan,Ahn, Jungryul,Park, Dae Jin,Lee, Sang Min,Kim, Kwangsoo,Cho, Dong-il Dan,Senok, Solomon S,Koo, Kyo-in,Goo, Yong Sook IOP 2017 Journal of neural engineering Vol.14 No.1
<P> <I>Objective</I>. Direct stimulation of retinal ganglion cells in degenerate retinas by implanting epi-retinal prostheses is a recognized strategy for restoration of visual perception in patients with retinitis pigmentosa or age-related macular degeneration. Elucidating the best stimulus-response paradigms in the laboratory using multielectrode arrays (MEA) is complicated by the fact that the short-latency spikes (within 10 ms) elicited by direct retinal ganglion cell (RGC) stimulation are obscured by the stimulus artifact which is generated by the electrical stimulator. <I>Approach</I>. We developed an artifact subtraction algorithm based on topographic prominence discrimination, wherein the duration of prominences within the stimulus artifact is used as a strategy for identifying the artifact for subtraction and clarifying the obfuscated spikes which are then quantified using standard thresholding. <I>Main results</I>. We found that the prominence discrimination based filters perform creditably in simulation conditions by successfully isolating randomly inserted spikes in the presence of simple and even complex residual artifacts. We also show that the algorithm successfully isolated short-latency spikes in an MEA-based recording from degenerate mouse retinas, where the amplitude and frequency characteristics of the stimulus artifact vary according to the distance of the recording electrode from the stimulating electrode. By ROC analysis of false positive and false negative first spike detection rates in a dataset of one hundred and eight RGCs from four retinal patches, we found that the performance of our algorithm is comparable to that of a generally-used artifact subtraction filter algorithm which uses a strategy of local polynomial approximation (SALPA). <I>Significance</I>. We conclude that the application of topographic prominence discrimination is a valid and useful method for subtraction of stimulation artifacts with variable amplitudes and shapes. We propose that our algorithm may be used as stand-alone or supplementary to other artifact subtraction algorithms like SALPA.</P>
The effects of an anger control group program on Korean children’s anger and aggression
Sanghee, Choi,Taehee, Jung,Kwangsoo, Kim 한국초등상담교육학회 2018 초등상담연구 Vol.17 No.1
본 연구는 학급단위 분노조절 집단상담 프로그램이 초등학생의 분노와 공격성 감소에 미치는 영향을 알아보기 위해 실시되었다. 서울특별시 소재 K초등학교 3학년 2개 학급과 4학년 2개 학급을 각각 실험집단과 통제집단으로 선정하였으며 구성 인원은 3학년 각 28명, 4학년 각 30명으로 하였다. 실험집단에는 일주일에 두 번, 회기당 40분씩 총 8회기에 걸쳐 학급단위 분노조절 집단상담 프로그램을 실시하였고 통제집단에는 아무런 처치를 하지 않았다. 프로그램 종결 후 집단 간 분노 및 공격성 검사의 사전, 사후, 추수 검사 결과를 비교 분석하였고, 실험집단의 각 회기별 소감문, 연구자 및 담임의 관찰 기록, 프로그램 평가 설문 등을 분석하였다. 연구결과 첫째, 학급단위 분노조절 집단상담 프로그램은 초등학생의 분노 감소에 프로그램 사후 및 추수검사에서도 효과가 있었다. 둘째, 학급단위 분노조절 집단상담 프로그램은 초등학생의 공격성 전체와 그 하위변인 모두에 프로그램 사후 및 추수검사에서도 효과가 있었다. 이러한 결과는 회기별 소감문과 연구자 및 담임의 관찰 기록, 프로그램 평가 설문 자료 분석을 통해 지지되고 보충, 심화되었다. This study investigated the effects of an anger control group program with Korean children who were in 3rd and 4thgrade of K elementary school in Seoul. An experimental versus control group design, with pre-test, post-test and follow-up measures, was used. This study’s findings revealed that the anger control program participants showed positive effects in the reduction of anger and aggression(verbal aggression, indirect aggression, negativeness, irritability and total aggression) compared to control group children. These effects were continued 4 weeks after this intervention. These results were supported and identified by content data based on participants’ reports after each session, teachers’ observation records and program evaluation of participants after the intervention. This study results showed that the anger control group program could be an effective tool to reduce children’s anger and aggression, applicable as a preventive and developmental guidance program with Korean children.
김광수(Kwangsoo Kim),김명섭(Myoung Sub Kim),김강대(Kang Dae Kim),정덕채(Duk Chae Jung),김동수(Dong Soo Kim),최병오(Byung Oh Choi) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
In this paper, we designed sandwich type pressure regulator for air pressure control system. As a result of research, we obtained several important conclusion. First, we decided theory of popper valve and relief valve which are used in sandwich type pressure regulator, and then designed prototype of pressure regulator. Second, we organized circuit diagram of dual pressure regulator of air pressure control system.