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Jongsu Lee,Junhyeon Byeon,Chang Woo Lee 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.3
In this study, we fabricated a thickness-controllable double-layer electrolyte to prevent peel-off among the anode, and cathode functional layers, and electrolyte layer generated during the sintering process in the fabrication of solid oxide fuel cell using the roll-to-roll additive manufacturing process. The peel-off could be generated by the diff erence of coeffi cient of thermal expansions (CTEs) of the component layers of SOFC. Gadolinium-doped ceria (GDC) is a ceramic electrolyte of which CTE is closer to the mixture of lanthanum strontium cobalt ferrite and gadolinium-doped ceria (LSCF-GDC), the cathode functional layer in this study, than yttrium-Stabilized zirconia (YSZ), the electrolyte layer. By embedding a thin GDC layer between LSCF-GDC and YSZ, the peel-off due to the thermal deformation can be prevented. Using the visco-capillary model, mass conservation law, and wettability of coated solution, we have determined the range of coating conditions for forming a stable coating bead. We coated a high-quality double-layer electrolyte of which component layer thicknesses can be controllable using a pilot-scale roll-to-roll slot-die coating process. The study can be useful to determine the coating conditions in the roll-to-roll process, i.e., coating gap, web speed, and fl ow rate, for thickness-controllable high-quality multi-layer coating without time and cost consumptive trial-and-error procedure.
Characteristics of meso-sized plastic marine debris on 20 beaches in Korea
Lee, Jongsu,Lee, Jongmyoung,Hong, Sunwook,Hong, Sang Hee,Shim, Won Joon,Eo, Soeun Elsevier 2017 MARINE POLLUTION BULLETIN Vol.123 No.1
<P><B>Abstract</B></P> <P>We surveyed the abundance and accumulation patterns of mesoplastic marine debris (5–25mm) on 20 beaches in Korea. The mean abundance of it was 13.2items/m<SUP>2</SUP>, and the mean weight was 1.5g/m<SUP>2</SUP>. Hard plastic and Styrofoam were the dominant types. The proportions of hard plastic and Styrofoam were highly variable among the beaches, each accounting for 0–100% of the total debris on a given beach with 32% and 48.5% (by number) on average, respectively. Relatively lower abundances of mesoplastic marine debris compared with our previous studies were likely due by differences of the sampling areas within the beach. The samples of this research were selected from backshore, middle line, and water edge whereas they were selected from high strandline and backshore in our previous studies. It should be considered when discussing the level of mesoplastic marine debris.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mean number of mesoplastic marine debris in Korean coasts was 13.2item/m<SUP>2</SUP>. </LI> <LI> Mean weight of mesoplastic marine debris in Korean coasts was 1.5g/m<SUP>2</SUP>. </LI> <LI> Hard plastic and styrofoam were the dominant types of plastic marine debris. </LI> <LI> Relatively low abundance of mesoplastic marine debris was determined. </LI> <LI> Low abundance seemed to come from selection of sampling area within the beach. </LI> </UL> </P>
Effect of Action Observational Training on Gait in People with Stroke
( Jongsu Lee ),( Youngmi Kim ),( Dongkyu Lee ) 대한물리치료학회 2020 대한물리치료학회지 Vol.32 No.1
Purpose: This study examined the effects of action observational training to improve the gait function for patients with stroke. Methods: The participants were divided into two groups: right hemiplegia group (n=12) and left hemiplegia group (n=12). All groups received conventional therapy for five sessions for 30 minutes, each for three weeks. Left and right hemiplegia group practiced additional action observational training for five sessions for 20 minutes each for three weeks. They participated in three weeks of action observational training coupled with immediate physical practice (intervention), followed by a final assessment. The duration of each action observation video sequence was 10 minutes, followed immediately by practice of the observed motor skill (10 minutes). The gait velocity, cadence, swing time, step length, and BOS (base of support) were examined using the GAITRite system. Results: The results of this study showed significant improvement in the gait function. The outcomes of the gait abilities from gait velocity, cadence, swing time, step length of the affected side, and BOS (base of support) were improved significantly in the right hemiplegia group (p<0.05). In the left hemiplegia group, there was no significant improvement in the gait velocity, cadence, and BOS except for the swing time and step length of the affected side. The left and right group comparisons between the groups were not significant (p<0.05). Conclusion: Action observation training improves the gait function. These results suggest that action observational training is feasible and suitable for stroke patients.
Performance Analysis of a Convolutional Interleaver under Mobile Satellite Fading Channel
Jongsu Lee,Sangseob Song,Sooyoung Kim,Heewook Kim,Do Seob Ahn 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
This paper describes the design and simulation results of a convolutional interleaver by burst errors under the mobile satellite fading channel. We investigate a personal mobile satellite system using turbo codes. An efficient interleaver effectively randomizes burst errors due to long term fading, and thus it can highly enhance the BER performance at the decoder output. We designe and presente two types of convolutional interleavers by trading off between the performance enhancementand the time delay. The systematic approach presented in this paper can be easily adjusted to other systems, and thus can be used to design efficient interleavers.
Analysis of Adhesion Strength of Laminated Copper Layers in Roll-to-Roll Lamination Process
Lee, Jongsu,Park, Sungsik,Park, Janghoon,Cho, Young Seek,Shin, Kee-Hyun,Lee, Dongjin Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.9
The roll-to-roll (R2R) lamination process is a promising technology for the fabrication of flexible electronic devices on large areas such as solar cells or organic light emitting diodes. In this study, mechanical factors in the R2R lamination process that affect the adhesion strength of laminated composite were studied by finite-element simulation based on a theoretical model. Moreover, the effect of mechanical factors on the attenuation of adhesion strength was evaluated by using a full factorial design of experiment. The results show that the adhesive strength of the laminated composite decreases as the operating tension and strain rate increase. However, the radius of the roller has the opposite tendency to the operating tension. Non-linear regression model was developed to express the adhesion strength according to the mechanical factors, followed by the determination of their ranges to minimize peel-off. The suggested analysis method, devices and non-linear regression model could be used as a guideline to pre-determine the operating conditions in the R2R lamination process before manufacturing laminated composites.