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Detection of primary RGB colors projected on a screen using fNIRS
Liu, Xiaolong,Hong, Keum-Shik World Scientific Publishing Company 2017 Journal of innovative optical health sciences Vol.10 No.3
<P>In this study, functional near-infrared spectroscopy (fNIRS) is utilized to measure the hemodynamic responses (HRs) in the visual cortex of 14 subjects (aged 22-34 years) viewing the primary red, green, and blue (RGB) colors displayed on a white screen by a beam projector. The spatiotemporal characteristics of their oxygenated and deoxygenated hemoglobins (HbO and HbR) in the visual cortex are measured using a 15-source and 15-detector optode configuration. To see whether the activation maps upon RGB-color stimuli can be distinguished or not, the <TEX>$ t$</TEX>-values of individual channels are averaged over 14 subjects. To find the best combination of two features for classification, the HRs of activated channels are averaged over nine trials. The HbO mean, peak, slope, skewness and kurtosis values during 2-7<TEX>$ \,$</TEX>s window for a given 10<TEX>$ \,$</TEX>s stimulation period are analyzed. Finally, the linear discriminant analysis (LDA) for classifying three classes is applied. Individually, the best classification accuracy obtained with slope-skewness features was 74.07% (Subject 1), whereas the best overall over 14 subjects was 55.29% with peak-skewness combination. Noting that the chance level of 3-class classification is 33.33%, it can be said that RGB colors can be distinguished. The overall results reveal that fNIRS can be used for monitoring purposes of the HR patterns in the human visual cortex.</P>
Controlled synthesis of transition metal/conducting polymer nanocomposites
Liu, Zhen,Liu, Yang,Zhang, Lin,Poyraz, Selcuk,Lu, Ning,Kim, Moon,Smith, James,Wang, Xiaolong,Yu, Yajiao,Zhang, Xinyu IOP Pub 2012 Nanotechnology Vol.23 No.33
<P>A novel displacement reaction has been observed to occur between conducting polymers (CP) and metal salts which can be used to fabricate nanostructured CP–metal composites in a one-pot manner. Vanadium pentoxide (V <SUB>2</SUB>O<SUB>5</SUB>) nanofiber is used during the synthesis as the reactive seeds to induce the nanofibril CP–metal network formation. The CP–metal nanocomposites exhibit excellent sensory properties for hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>) detection, where both high sensitivity and a low detection limit can be obtained. The sensory performance of the CP–metal composite can be further enhanced by a facile microwave treatment. It is believed that the CP–metal nanofibril network can be converted to a carbon–metal network by a microwave-induced carbonization process and result in the sensory enhancement. </P>
Toward the multiscale nature of stress corrosion cracking
Xiaolong Liu,황웅기,박재웅,반동현,Yunlong Chang,이승환,김성엽,한상수,이보영 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.1
This article reviews the multiscale nature of stress corrosion cracking (SCC) observed by high-resolutioncharacterizations in austenite stainless steels and Ni-base superalloys in light water reactors (includingboiling water reactors, pressurized water reactors, and supercritical water reactors) with related opinions. A new statistical summary and comparison of observed degradation phenomena at different lengthscales is included. The intrinsic causes of this multiscale nature of SCC are discussed based on existingevidence and related opinions, ranging from materials theory to practical processing technologies. Questions of interest are then discussed to improve bottom-up understanding of the intrinsic causes. Last, a multiscale modeling and simulation methodology is proposed as a promising interdisciplinarysolution to understand the intrinsic causes of the multiscale nature of SCC in light water reactors, basedon a review of related supporting application evidence
Xiaolong Liu,Keum-Shik Hong 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
In this study, we have used functional near-infrared spectroscopy (fNIRS) to measure the hemodynamic response in the visual cortex. We concurrently measure and discriminate the fNIRS signals evoked by three different color stimuli: red, green, and blue (RGB) colors. Seven healthy subjects were asked to perform the RGB color stimuli experiment during a 10 s task and 25 s rest period. Using a continuous-wave fNIRS system, brain signals were acquired concurrently from the visual cortex. Multiclass linear discriminant analysis was utilized to classify RGB stimuli, which resulted in an average classification accuracy of 66.67% across the 7 subjects. A 3~8 s time window during a 10 s task period provided the best result in classification.
Mechanical Performances of Concrete Produced with Desert Sand After Elevated Temperature
Haifeng Liu,Xiaolong Chen,Jialing Che,Ning Liu,Minghu Zhang 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.4
Currently, fire in building is one of the most serious disasters. With the increase of basic construction items in western China, ordinary medium sand resource no longer met with the need of engineering. Compressive strength experiments of concrete produced with desert sand after elevated temperature were carried out in this paper. The effects of desert sand replacement rate (DSRR), temperature and cooling regime on the mechanical performances of concrete produced with desert sand were analyzed. XRD and SEM experiments were also conducted to study the microstructure of concrete produced with desert sand after elevated temperature. Experimental results showed that the cubic compressive strength of concrete produced with desert sand increased firstly, and then declined with temperature. Whereas, the prismatic compressive strength and elasticity modulus of concrete produced with desert sand under static compression declined with temperature. With the enhancement of DSRR, the elasticity modulus under static compression, cubic compressive strength and prismatic compressive strength of concrete produced with desert sand after elevated temperature increased firstly, and then declined, the maximum value of which was reached when DSRR amounted to 40%. Regression models were established to predict the mechanical performances of concrete produced with desert sand after elevated temperature, which were in good agreement with experimental results.
Research on Machining Deformation of 7050 Aluminum Alloy Aircraft Rib Forging
Yaoqiong Liu,Hai Gong,Yongbiao He,Tao Zhang,Yanjie Sun,Xiaolong Liu 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.5
T-type rib strip was the key connective component between the fuselage and wing of the aircraft and the main processes for preparation of T-type rib strip consisted of forging forming, solution quenching, cold pressing and machining. The variation of residual stress and its effect on the deformation during the final machining process was quite complex. In this study, the numerical models of solution quenching, cold pressing and machining of T-type rib strip was established. The variation of residual stress on the deformation of T-type rib strip was studied. The results show that the maximum quenching stress of the T-type rib was about − 200 MPa at the surface and 150 MPa in the core. A reduction of 60% of the average residual stress can be achieved during the cold pressing process with a reduction rate of 3% and a friction coefficient of 0.3. Compared with direct machining after quenching, the deformation of machining after solution quenching and cold pressing was greatly reduced and the reduction rate reached 65.04%.
Shuqiang Liu,Gaihong Wu,Xiaofang Zhang,Juanjuan Yu,Mingfang Liu,Yao Zhang,Peng Wang,Xiaolong Yin 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
The drug-release time of suture should meet with the healing time of wound, so it is needed to control the drugrelease performance of polylactic acid (PLA) suture. In this paper, two biodegradable polymers with different degradation rates, such as polycaprolactone (PCL) and polyglycolide (PGA), were applied to carry the drug of tea polyphenol (TP). The drug-loading finishing solution which is made of PCL/PGA carriers and TP, was coated on the PLA suture. The drug-release rate and time of PLA suture could be regulated by adjusting the proportion of PCL/PGA carriers. The results indicate that thesurface of drug-loaded PLA suture becomes rough. There is no obvious chemical reaction among the drug, carriers and PLA suture, just physical adhesion. With the increasing of PCL in drug-carriers, the strength of suture gradually increases. At 70/30 of PCL/PGA, the fracture elongation of suture reaches the highest point. In process of degradation, the surface of drugloaded PLA suture appears some holes after 25 weeks. The strength of sutures decreases gradually during degradation, and the effective strength time of sutures with various proportions of PCL/PGA is different. The drug-release rate of the suture isfast at early stage and slow at later stage and the higher the PGA proportion is, the faster the drug-release rate of the suture is.