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The letter recognition using BCI system
Kaplan, Alexander Ya,Song, Young-Jun,Kim, Nam The Korea Contents Association 2011 International Journal of Contents Vol.7 No.3
In this paper, we show how such enhancement of Farwell-Donchin BCI enables a fresh, inexperienced user to achieve quickly an accurate BCI control with a high information transfer rate. This paper presents the results of a BCI experiment where the participant, who had no previous BCI experience, obtained, in about 20 min, a highly reliable and fast control over the BCI spelling device based on the Farwell-Donchin paradigm. Offline analysis showed that the high performance of the BCI was, to a high extent, due to the use of the ERP component N1, in addition to component P300, which has been considered the only ERP component important for the prediction of user's choice in the Farwell-Donchin paradigm in many publications.
The letter recognition using BCI system
Alexander Ya Kaplan,Young Jun Song,Nam Kim 한국콘텐츠학회 2011 International Journal of Contents Vol.7 No.3
In this paper, we show how such enhancement of Farwell-Donchin BCI enables a fresh, inexperienced user to achieve quickly an accurate BCI control with a high information transfer rate. This paper presents the results of a BCI experiment where the participant, who had no previous BCI experience, obtained, in about 20 min, a highly reliable and fast control over the BCI spelling device based on the Farwell-Donchin paradigm. Offline analysis showed that the high performance of the BCI was, to a high extent, due to the use of the ERP component N1, in addition to component P300, which has been considered the only ERP component important for the prediction of user's choice in the Farwell-Donchin paradigm in many publications.
Mahmoud Moradi,Saleh Meiabadi,Alexander Kaplan 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5
In the present study additive manufacturing of Polylactic acid by fused deposition modeling were investigated based on statisticalanalysis. The honeycomb internal pattern was employed to build inside of specimens due to its remarkable capability toresist mechanical loads. Simplify 3D was utilized to slice the 3D model and to adjust fixed parameters. Layer thickness, infillpercentage, and extruder temperature were considered as controlled variables, while maximum failure load (N), elongationat break (mm), part weight (g), and build time (min) were selected as output responses and analysed by response surfacemethod. Analysis of variance results identified layer thickness as the major controlled variable for all responses. Interactionof infill percentage and extruder temperature had a significant influence on elongation at break and therefore, tough fractureof printed parts. The input parameters were optimized to materialize tow criteria; the first one was to rise maximum failureload and the second was to attain tough fracture and lessen build time and part weight at a time. Optimal solutions wereexamined by experimental fabrication to evaluate the efficiency of the optimization method. There was a good agreementbetween empirical results and response surface method predictions which confirmed the reliability of predictive models. The optimal setting to fulfill the first criterion could bring on a specimen with more than 1500 (N) maximum failure loadand less than 9 (g) weight.
내로우 갭 적용을 위한 핫와이어 송급 레이저용접 - 고속촬영을 통한 와이어 용융/이행 현상과 아크 포메이션 분석 -
Kim, Kyounghak,Bang, Hansur,Bang, Heeseon,Kaplan, Alexander F.H.,Nasstrom, Jonas,Frostevarg, Jan 대한용접접합학회 2016 대한용접·접합학회지 Vol.34 No.5
In this study, Hot-wire laser welding (HWLW) without keyhole which deposits filler material by feeding hot wire into the process zone has been performed to increase process performance. From the analysis of High Speed Imaging (HSI), for higher voltage, the process is prone to arc formation and drop transfer, which is disagreeable transfer mode. It is necessary that arc formation and drop (globular) transfer should be avoided by lower voltage. Therefore, continuous wire melting and transfer mode is preferred when adopting this process. The HWLW technique has high potential in terms of performance, precision, robustness and controllability for thick section of narrow gap.
김경학(Kyounghak Kim),방한서(Hansur Bang),방희선(Heeseon Bang),Alexander F. H. Kaplan,Jonas Nasstrom,Jan Frostevarg 대한용접·접합학회 2016 대한용접·접합학회지 Vol.34 No.5
In this study, Hot-wire laser welding (HWLW) without keyhole which deposits filler material by feeding hot wire into the process zone has been performed to increase process performance. From the analysis of High Speed Imaging (HSI), for higher voltage, the process is prone to arc formation and drop transfer, which is disagreeable transfer mode. It is necessary that arc formation and drop (globular) transfer should be avoided by lower voltage. Therefore, continuous wire melting and transfer mode is preferred when adopting this process. The HWLW technique has high potential in terms of performance, precision, robustness and controllability for thick section of narrow gap.
Numerical simulation of laser ablation driven melt waves
Pocorni, Jetro,Han, Sang-Woo,Cheon, Jason,Na, Suck-Joo,Kaplan, Alexander F.H.,Bang, Hee-Seon Elsevier 2017 Journal of manufacturing processes Vol.30 No.-
<P><B>Abstract</B></P> <P>Numerical simulations on the melt flow down the keyhole front during fibre laser welding are presented here. The calculations confirm the existence of melt waves previously observed by high speed imaging, with velocities ranging between 4 and 10m/s. The simulations provide spatial and temporal information on the temperature and flow fields, particularly within the melt film volume, which cannot be observed by high speed imaging. The ablation pressure achieves high values around wave-peaks and at the bottom of the front, just before droplets are sheared off. The simulation results provide explanations on the main liquid transport mechanisms within the keyhole based on information on the temperature, velocity and pressure field and on the geometrical front conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Laser ablation driven melt waves are, for the first time, theoretically analyzed. </LI> <LI> The simulations provide detailed information, complementary to high speed imaging. </LI> <LI> Boiling peaks generate V-shaped waves that propagate downwards. </LI> <LI> A theoretical description of the waves was derived from the findings. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>