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RISS 인기검색어
- 검색키워드
- 저자 : ( Do-yeop Kim ) (검색결과 185 건)
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김도균,이준호,유승엽,장정수,권영수 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
The electrical properties of Maleate copolymer (C_(18)MA-VE_(2)) and Itaconate copolymer (C_(18)ITA-VE_(2)) Langmuir-Blodgett (LB) films for in-plane were investigated to develop the gas sensor. The C_(18)MA-VE_(2) and C_(18)ITA-VE_(2) were used as sensitive materials and deposition on the slide-glass substrate using LB method which could control the thickness in the molecular order (Å). The current-voltage (I-V) characteristics were measured to investigated the response characteristics in chloroform, acetone, ethanol and methanol gases. The conductivity of sensitive films were 10^(-)7[S/cm] for an in-plane. The change of conductivity was occurred by behavior of organic gases, which mean that the behavior of organic gases could be analyzed using conductivity change and application to gas sensor. In the experimental results, the relation between sensitive films and organic gases could be divided by three-type. Thus, we could analyze the modeling of the response characteristics of organic gases using the conductivity change of sensitive films.
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Kim, Gi-Do,Min, Kyung-Ok,Kim, Kyung-Yoon,Sim, Ki-Cheol,Nam, Ki-Won,Koo, Ja-Pung,Park, Joo-Hyun,Moon, Ok-Kon,Yu, Seong-Hun,Kim, Gye-Yeop International Academy of Physical Therapy Research 2010 Journal of International Academy of Physical Ther Vol.1 No.2
This study is intended to examine the motor skill learning and treadmill exercise on motor performance and synaptic plasticity in the cerebellar injured rats by harmaline. Experiment groups were divided into four groups and assigned 15 rats to each group. Group I was a normal control group(induced by saline); Group II was a experimental control group(cerebellar injured by harmaline); Group III was a group of motor skill learning after cerebellar injured by harmaline; Group IV was a group of treadmill exercise after cerebellar injured by harmaline. In motor performance test, the outcome of group II was significantly lower than the group III, IV(especially group III)(p<.001). In histological finding, the experimental groups were destroy of dendrities and nucleus of cerebellar neurons. Group III, IV were decreased in degeneration of cerebellar neurons(especially group III). In immunohistochemistric response of synaptophysin in cerebellar cortex, experimental groups were decreased than group I. Group III's expression of synaptophysin was more increased than group II, IV. In electron microscopy finding, the experimental groups were degenerated of Purkinje cell. These result suggest that improved motor performance by motor skill learning after harmaline induced is associated with dynamically altered expression of synaptophysin in cerebellar cortex and that is related with synaptic plasticity.
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Preliminary design and performance analysis of a radial inflow turbine for organic Rankine cycles
Kim, Do-Yeop,Kim, You-Taek Elsevier 2017 Applied thermal engineering Vol.120 No.-
<P><B>Abstract</B></P> <P>Although the turbine among the components of organic Rankine cycle (ORC) has a significant impact on the cycle efficiency, only a handful studies have been conducted so far on the turbine design. The first step in the development of radial inflow turbines is the preliminary design, and the rigorous preliminary design can simplify the turbine optimization process. This study proposes a new design method to develop radial inflow turbines for ORC. The proposed method does not deal with the ideal gas equation and average state properties. In addition, the performance chart for gas turbines was not used. These improvements are the advantages of the proposed method. Applying the proposed method, we designed a trans-critical radial inflow turbine for geothermal power systems and used CFD analysis to evaluate the performance of the designed turbine. For the CFD analysis, grids independent on the turbine output and suitable for y+ criterion were used. And, the numerical models suitable for the flow conditions were also applied. The CFD results showed that the radial inflow turbine designed in this study more closely approximated design conditions than one of Sauret and Gu (2014). A turbine performance analysis in off-design conditions was also conducted using CFD. The results showed that the incidence angle to rotor blades as well as RPM had a great impact on the efficiency and output of the turbine. And, these variables could be suitably determined using the proposed design method.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study presents a preliminary design method of ORC radial-inflow turbines. </LI> <LI> A trans-critical ORC radial inflow turbine is designed by the proposed method. </LI> <LI> Three-dimensional viscous simulations are conducted for the performance analysis. </LI> <LI> The proposed method can be used to design a turbine suitable for design conditions. </LI> <LI> It can be seen that the rotor incident angle has a great impact on the performance. </LI> </UL> </P>
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Kim, Hee Su,Lee, Tack Ho,Yeop, Jiwoo,Cho, Hye Won,Kim, Jae Won,Park, Song Yi,Park, Jong Baek,Kim, Jin Young,Hwang, Do-Hoon American Chemical Society 2018 The Journal of Physical Chemistry Part C Vol.122 No.29
<P>Semiconducting polymers consisting of (<I>E</I>)-1,2-di(thiophen-2-yl)ethene (TVT) derivatives and benzo[1,2-<I>b</I>:4,5-<I>b</I>′]dithiophene with conjugated thiophene side chains (BDTT) were designed and synthesized to investigate the effect of fluorine and cyano groups in the 3-position of the thiophene ring in TVT on the photovoltaic properties. The corresponding PBDTT-TVT, PBDTT-FTVT, and PBDTT-CNTVT copolymers containing TVT, difluoro TVT (FTVT), and dicyano TVT (CNTVT), respectively, demonstrated considerable variations in optical, electrochemical, morphological, and charge transporting properties. PBDTT-FTVT showed suitable frontier orbital energy levels, favorable face-on orientation, and a well-mixed and smooth morphology in the blends with 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-<I>d</I>:2′,3′-<I>d</I>′]-<I>s</I>-indaceno[1,2-<I>b</I>:5,6-<I>b</I>′]dithiophene (ITIC) and [6,6]-phenyl-C<SUB>71</SUB>-butyric acid methyl ester (PCBM). In contrast, PBDTT-CNTVT showed unfavorable frontier orbital energy levels and bimodal orientation in the thin-film state, which interrupted efficient charge transport in organic photovoltaic devices. The device fabricated using PBDTT-FTVT exhibited the highest power conversion efficiency (PCE) of up to 6.50% with ITIC and a slightly lower PCE of 6.35% with PCBM.</P> [FIG OMISSION]</BR>
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Kim, Jun-Seong,Kim, Do-Yeop,Kim, You-Taek Elsevier 2019 Applied thermal engineering Vol.149 No.-
<P><B>Abstract</B></P> <P>The organic Rankine cycle makes it possible to accomplish energy recovery from a low-temperature heat source, which is typically not recovered for economic reasons. As the expander for the organic Rankine cycle, the radial turbine is easy to manufacture and has advantages in terms of size and efficiency. The radial turbine design modeler (RTDM), which was developed from in-house code, is a preliminary design program for radial inflow turbines and is different from the commercially available program RITAL. In this study, an experiment on radial inflow turbines is performed using both RTDM and RITAL. As a result, the output and efficiency of the RTDM and RITAL turbines are 36.04 kW, 80.03% and 35.03 kW, 76.01%, respectively. Experimental results demonstrate that the performance of the RTDM turbine is almost similar to the RITAL turbine. We also perform analysis on performance prediction utilizing a deep neural network with two hidden layers based on the experimental data. As a result, the minimum root mean squared errors of the RTDM turbine and RITAL turbine are estimated to be approximately 1.81 and 1.65, respectively. The deep neural network is able to predict the trends of the experiment for the organic Rankine cycle.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Experimental equipment was constructed based on the thermodynamic cycle. </LI> <LI> Each turbine was manufactured by a self-developed program and a commercial program. </LI> <LI> A turbine designed by a self-developed program showed somewhat better performance. </LI> <LI> A prediction model was studied using experimental data and deep neural networks. </LI> <LI> The deep neural network was able to predict the trends of the experimental results. </LI> </UL> </P>
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Kim, Do-Yeop,Kim, You-Taek Elsevier 2017 RENEWABLE ENERGY Vol.106 No.-
<P><B>Abstract</B></P> <P>Ocean thermal energy conversion is an organic Rankine cycle for generating power using the temperature difference between surface seawater and deep seawater. The potential of ocean thermal energy is significant, and it is an environmentally friendly power system. However, its thermal efficiency is very low due to the low temperature difference between surface seawater and deep seawater. Hence, it is essential to develop a high efficiency turbine in order to improve the thermal efficiency of ocean thermal energy conversion. The precise preliminary design for the high efficiency radial inflow turbine requires selection of the appropriate flow and loading coefficients for the target efficiency. A new approach for the appropriate choice of flow and loading coefficients is proposed in this study. The meanline analysis and three-dimensional viscous simulations for the designed turbine are conducted in order to verify the proposed approach in design and off-design conditions. The results demonstrate that the optimum radial inflow turbine for the design conditions can be designed through applying the proposed model.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study presents the preliminary design process of a 200 kW radial inflow turbine for ocean thermal energy conversion. </LI> <LI> A new approach that can calculate the appropriate flow and loading coefficients for the target efficiency is proposed. </LI> <LI> The meanline analysis and 3D viscous simulations for the designed turbine are conducted to verify the proposed model. </LI> <LI> The results demonstrate that the optimum radial inflow turbine can be designed through applying the proposed model. </LI> </UL> </P>
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Predictors associated with treatment response to cryotherapy in plantar warts
( Do-yeop Kim ),( Hyun-sun Park ),( Soyun Cho ),( Hyun-sun Yoon ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.2
Background: Studies on the predictive factors of cryotherapy in the treatment of cutaneous warts are scarce. Objectives: The aim of this study was to investigate the factors affecting the treatment response to cryotherapy in plantar warts. Methods: We retrospectively reviewed all outpatients under 40 years old who started cryotherapy for plantar warts from February 2016 to July 2017. Age, sex, previous treatments, clinical characteristics of warts, and treatment intervals were obtained from the medical records. We analyzed the associations of these variables with cure of warts using Cox proportional hazards regression analysis. Results: Of the 88 patients, 61 (69.3%) were male, and 52 (59.1%) achieved complete clearance of plantar warts. Median age at the first treatment was 12.0 years (interquartile range, 9.0 to 24.0). In the multivariable Cox regression analysis, male gender, increasing number of warts, appearance of any new lesion within 3 months, and treatment interval of more than 3 weeks were associated with a lower cure rate of plantar warts. However, age, duration of disease, location, and size of wart were not associated with the cure rate. Conclusion: Clarifying predictive factors might help to refine triage of plantar warts to the appropriate cryotherapy methods. Treatment interval of more than 3 weeks is less effective in the cryotherapy of plantar warts.
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