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Seongkyu Kim,Bum-Suk Lee,Ji Min Kim 대한재활의학회 2014 Annals of Rehabilitation Medicine Vol.38 No.2
Objective To investigate the ability of spinal cord injury (SCI) patients in the use mobile cellular devices, especially the smartphone.Methods Seventeen people with motor complete cervical SCI participated in the study. The assist-devices deemed most fitting were introduced to the patients: a mouth stick, multifunctional splint, activities of daily living (ADL) splint, universal cuff or none of the above. To determine the effective devices, a Multi-Directional Click Test (MDCT), Phone Number Test (PNT), and individual satisfaction inquiry were used. The most appropriate assist device was selected by MDCT. Subsequently PNT and individual satisfaction inquiry were performed with the conventional model and compared.Results Those with C4 cord injury chose mouth stick. Those with C5 cord injury chose multifunctional splint (3 people) and ADL splint (2 people). Those with C6 cord injury chose universal cuff (3 people) or bare hands only. Those with C7 cord injury chose universal cuff (3 people). With a smartphone, all participants were able to complete the PNT. With a conventional model, only twelve participants (71%) were able to complete the same test. While it took 26.8±6.8 seconds with a conventional model to complete PNT, the same test took 18.8±10.9 seconds to complete with a smartphone (p<0.05). Overall, participants expressed higher satisfaction when using a smartphone.Conclusion The results offer a practical insight into the appropriate assist devices for SCI patients who wish to use mobile cellular devices, particularly smartphones. When the SCI patients are given the use of a smartphone with the appropriate assist devices, the SCI patients are expected to access mobile cellular device faster and with more satisfaction.
Kim, Dong Hyawn,Kim, Dookie,Chang, Seongkyu Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.31 No.2
The reduction of the dynamic response of an offshore structure subjected to wind-generated random ocean waves is of extreme significance in the aspects of serviceability, fatigue life and safety of the structure. In this study, a new neuro-control scheme is applied to the vibration control of a fixed offshore platform under random wave loads to examine the applicability of the proposed method. It is called the Lattice Probabilistic Neural Network (LPNN), as it utilizes lattice pattern of state vectors as the training data of PNN. When control results of the LPNN are compared with those of the NN and PNN, LPNN showed better performance in effectively suppressing the structural responses in a shorter computational time.
음식물 침출수를 처리하는 막결합 고온혐기성 소화시스템에서 교차여과와 막간압력이 파울링에 미치는 영향
Youngo Kim,Dukwoo Jun,Seongkyu Yoon,Chunghee Chang,Jaeho Bae,Kwansun Yoo,Jeonghwan Kim 한국막학회 2011 멤브레인 Vol.21 No.4
음식물 폐기물 침출수를 처리하는 분리막 결합 고온 혐기성소화공정(생물학적 반응조) (Anaeorobic Membrane Bioreactor, AnMBR)의 파일럿 운전에서 분리막의 교차여과 속도와 막간압력이 파울링에 미치는 영향을 관찰하였다. 연구 결과 정압여과 하에서 교차여과 속도가 증가할수록 파울링의 속도는 현격히 감소되었다. 그러나 이와 같은 영향은 낮은 막간압력에서 더욱 효과적이었다. 막간압력이 증가할수록 여과대상 물질의 압축성으로 인해 투과성이 상대적으로 낮은 파울링층(혹은 케익층)이 분리막 표면에 형성된 것에 기인된 듯하다. 여과대상 시료의 입도분석을 해 본 결과 입자크기는 약 10~100mum 범위에서 분포하였고 이에 따라 브라운확산에 의한 역수송보다 분리막 표면에서 교차여과에 의해 발생하는 전단력이 입자의 역수송에 더욱 기여하고 있음을 예측할 수 있었으며 이는 AnMBR의 연속운전을 통해 재확인할 수 있었다. 운전 후 막 부검을 실시한 결과 유기 및 무기 파울링이 모두 관찰되었으나 어느 것이 지배적인 파울링 기작을 나타내는지는 앞으로 더욱 연구가 필요하다. 무기 파울링의 경우 대부분 분리막 표면에서 스케일링 형성이 지배적이었으며, 따라서 분리막의 공극 막힘에 주로 기여하는 작은 콜로이드성 유기물질의 경우 분리막 표면에서 전단력에 의한 역수송 효과는 그다지 크지 않을 것으로 사료된다. The effect of cross-flow velocity and transmembrane pressure (TMP) on membrane fouling was observed from pilot-scale operation of thermophilic anaerobic membrane bioreactor (AnMBR) treating food waste leachate. It was found that fouling rate was reduced significantly as cross-flow velocity increased at constant TMP mode of operation while this effectiveness was more pronounced at lower TMP. Higher TMP resulted in less permeable fouling layer possibly due to compressibility of foulant material on membrane surface. Particle sizes of membrane concentrate ranged from 10 to 100mum, implying that shear-induced diffusion enhance back transport of these particle sizes away from the membrane effectively. From the continuous operation of AnMBR, it was confirmed that shear rate played an important role in the reduction of membrane fouling. Membrane autopsy works at the end of operation of AnMBR showed clearly that both organic and inorganic fouling were significant on membrane surface. Surface shear by cross-flow velocity was expected to be less effective to remove irreversible fouling which can be mainly caused by the adsorption of organic colloidal materials into membrane pores.
Geometrical effects on the surface plasmonic resonance by highly ordered Au nanostructures
Park, Seongkyu,Song, Hyerin,Yoo, Dayoung,Kim, Kyujung,Kim, Yangdo,Lee, Dongyun Elsevier 2019 The Journal of physics and chemistry of solids Vol.126 No.-
<P><B>Abstract</B></P> <P>Three differently shaped and highly ordered Au nanostructures were fabricated using an anodized aluminum oxide template and a thermal evaporator. A long-range ordered cone shape, embossed shape structure, and wave-like shape were obtained. Nanoparticles were added to the substrates with the three different shapes of ordered Au nanostructures, to verify the surface-enhanced Raman scattering by nanostructures with various shapes and gaps between structures. The simulation results showed the dependency of the Raman signal on the shape of the nanostructures, and hot-spots were found to depend largely on the distance between the structures and the wavelength of the incident light source. Thus, nanostructures can be designed to achieve various purposes by varying their shapes and the fabrication process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Three differently shaped and highly ordered Au nanostructures were fabricated for understanding geometrical effect on SPR. </LI> <LI> Nanoparticles were added onto the Au nanostructures to verify geometrical effects with various nanostructures. </LI> <LI> The results exhibited dependency of the Raman signal on the shape of the nanostructures but no stereotypes exist. </LI> <LI> Nanostructures need to be designed to achieve various purposes by varying their shape and the process of their fabrication. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
EPS 시스템의 On-center Handling 특성 개선
김성규(Seongkyu Kim),정대종(Daijong Chung),김정탁(Jungtak Kim),최대근(Daegeun Choi) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
The EPS system is superior to conventional hydraulic power steering system in the aspect of fuel economy,<br/> environment and assembly convenience but the increase of friction and inertia may cause unnatural steering feeling<br/> especially in on-center range. Therefore, EPS has its own special control logic to compensate it.<br/> In this paper, the study for an objective evaluation method with steering angle, steering torque, lateral acceleration<br/> and yaw rate was addressed to quantify on-center handling of EPS system. Based on this method, the control factors<br/> that affect on-center handling performance was analyzed and test results show that on-center handling can be<br/> improved with adequate returnability control, damping compensation and inertia compensation.