Effect of Acupuncture Manipulations at LI4 or LI11 on Blood Flow and Skin Temperature

Wenhui Li,Andrew Ahn 사단법인약침학회 2016 Journal of Acupuncture & Meridian Studies Vol.9 No.3

Acupuncture induces physiological changes, and patients have reported warm or cool sensations with “Burning Fire” (BF) or “Penetrating Cool” (PC) manipulations. This study aimed to evaluate whether these techniques had distinct effects on skin temperature and blood flow and to examine whether skin temperature correlated with blood flow. The participants were 25 healthy volunteers, each receiving acupuncture manipulations on points LI4 and LI11 bilaterally. Skin temperatures and blood flow were recorded continuously on both arms. The study found that acupuncture significantly increased skin temperature on the needling arm by 0.3514°C on average, but decreased it on the contralateral arm by 0.2201°C on average. Blood flow decreased significantly in both arms during needling (−3.4% and −5.97% for the ipsilateral and the contralateral sides, respectively), but the changes in skin temperature did not correlate with the changes in blood flow. Furthermore, these changes were not significantly different between acupuncture techniques and acupuncture points. In conclusion, acupuncture changes local skin temperature and blood flow independent of the manipulation technique. Moreover, blood flow may not be affected by the increased temperature on the needling arm. These results help to verify traditional Chinese medicine concepts and may help in establishing standards for acupuncture treatments.

Robust, self-cleaning, amphiphobic coating with flower-like nanostructure on micro-patterned polymer substrate

Yao, Wenhui,Li, Lei,Li, Oi Lun,Cho, Young-Wook,Jeong, Myung-Yung,Cho, Young-Rae Elsevier 2018 Chemical Engineering Journal Vol.352 No.-

<P><B>Abstract</B></P> <P>Many superhydrophobic surfaces lose their repellency to water owing to the contamination of organic liquids or mechanical damage. Though amphiphobic coatings can repel both water and organic liquids, the poor mechanical and chemical stabilities significantly restrict their practical applications. Herein, we demonstrated a hydrothermal method to synthesize micro-patterned substrates bearing NiAl layered double hydroxide with flower-like nanostructures, which resemble the surface morphology of a lotus leaf. The surface was further modified by a low-surface-energy material of perfluorooctanoic acid through a solution immersion method. The binder-free coating formed in-situ on the substrate showed a good adhesion quality of 5B (ASTM D-3359). The coating possessed high repellency to different liquid droplets, including water, diiodomethane, ethylene glycol, soybean oil, etc., with surface tensions ranging from 72.7 to 22.4 mN m<SUP>−1</SUP>. Due to the excellent self-cleaning property, the contaminant on the surface was easily cleaned as the water droplet rolled off. Moreover, the coating exhibited good mechanical and chemical robustness in some extreme conditions, such as gas blowing, sea sand abrasion, and chemical immersion tests. These good performances made the coating possible to be applied widely in various practical applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Flower-like nanostructure of NiAl-LDH was synthesized on micro-patterned polymer. </LI> <LI> The hierarchical structure showed good amphiphobicity after fluorination. </LI> <LI> The amphiphobic surface possessed excellent self-cleaning performance. </LI> <LI> The amphiphobic surface exhibited good mechanical and chemical robustness. </LI> <LI> The coating can be used in anti-contaminant, self-cleaning, and biomedical device. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Impact of pillar configuration on the amphiphobicity of micro-patterned polymer surface

Yao, Wenhui,Li, Oi Lun,Kang, Young-Joon,Jeong, Myung-Yung,Cho, Young-Rae Elsevier 2018 Vacuum Vol.156 No.-

<P><B>Abstract</B></P> <P>Hydrophobic surfaces are easily contaminated by oil owing to its lower surface tension, which significantly limits their potential applications. In this study, micro-patterned surfaces with cylindrical or square pillar arrays were fabricated on a polycarbonate substrate by the thermal imprinting process. The geometry and size of the pillars were varied to obtain different samples, whereas the height of the pillars was kept constant. The surface of each micro-patterned sample was fluorinated with perfluorooctanoic acid. With the aim of characterizing the wetting behavior of the samples, droplets of water and oily liquids with different surface tensions were employed to measure the contact angles. In addition, the applicability of the Wenzel and Cassie equations for explaining the wetting mechanisms of droplets on the surfaces of the micro-patterned samples was systematically investigated. The prediction obtained using the Wenzel equation was found to differ considerably from the experimental results, whereas the Cassie equation was found to be acceptable for satisfactorily explaining the wetting behaviors of liquids on the micro-patterned samples. The main factor influencing the surface wettability of the micro-patterned sample was not the pillar geometry, but rather the pillar configuration, e.g., the solid area fraction, groove fraction, and spacing between pillars.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Micro-patterned surface with pillar array is formed by a thermal imprinting method. </LI> <LI> The micro-patterned surface is repellent to both water and oily liquids. </LI> <LI> Effect of pillar configuration on the amphiphobicity is studied. </LI> <LI> Wetting mechanism of liquid droplet on the micro-patterned surface is proposed. </LI> </UL> </P>

Yaw effects on train aerodynamics on a double-track viaduct: A wind tunnel study

Wenhui Li,Tanghong Liu,Pedro Martinez-Vazquez,Zhengwei Chen,Xiaoshuai Huo,Zijian Guo,Yutao Xia 한국풍공학회 2021 Wind and Structures, An International Journal (WAS Vol.33 No.3

The aerodynamic performance of a scaled high-speed train model mounted on a double-track viaduct was studied through a wind tunnel test. The pressure distribution of different loops and the centerline on the streamlined nose region, as well as the aerodynamic load coefficients of the leading car were explored under yaw effects ranging from β=-30° to β=30°. Results showed that Reynolds effects became independent when the wind speed surpassed 40 m/s, the corresponding Re of which equals 6.51 × 105 . The pressures recorded along the centerline of train nose for the upstream scenario, was more sensitive to the yaw effects as the largest pressure difference gradually broadened against yaw angles. In addition, the pressure coefficients along the centerline and symmetrical taps of the loops, approximately fit a quadratic relationship with respect to yaw angles. The presence of the tracks and viaduct decks somehow mitigated the intensity of the airflow at downstream side. The experimental test also revealed that, the upstream configuration provided higher mean side force, yawing, and rolling moments up to β=20° whereas over that angle the force and moments exhibited the opposite performance.

Dependence Measure and Wolfe-Powell Criterion Based Two-stage Algorithm for Identification of Time Delay FIR Models

Wenhui Li,Shaoxue Jing,Bin Yang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.10

Time delay dynamic systems are widely existed due to sensors, actuators or other reasons. In this paper, a time delay FIR system is considered to model linear dynamic systems. The reason why the FIR model is selected is to highlight the proposed time-delay estimation method and parameter identification algorithm, and avoid the impact of a complex model on readers’ understanding of the proposed technologies. Firstly, to obtain an estimate of the time delay, a dependence measure based method is proposed. Unlike the optimization method that requires the parameter estimate and needs to round the estimated delay, the delay estimation method based on the 2-copula dependence measure can give accurate delay estimates independently of the parameters and without rounding. Secondly, to estimate the parameters, a variable stacking length multi-gradient identification algorithm is studied. The multi-gradient technique takes recent several gradients to accelerate the stochastic gradient algorithm. The stacking length, i.e., the number of gradients used in each iteration, is determined by the Wolfe-Powell criterion. The effectiveness is tested by numerical simulations and case study.

Multi-Target Adaptive On-line Tracking based on WIHM

Wenhui Li,Hongyin Ni,Ying Wang,Peixun Liu,Yuchao Zhou 보안공학연구지원센터(IJSIP) 2014 International Journal of Signal Processing, Image Vol.7 No.1

Wavelet Subspace Based Integrated Face Recognition Scheme

Wenhui Li,Ning Ma,Zhiyan Wang 보안공학연구지원센터(IJSIP) 2014 International Journal of Signal Processing, Image Vol.7 No.6

In this paper, based on the study of the Two-Dimensional Principal Component Analysis (2DPCA), Two-Dimensional Principal Component Analysis (2DPCA) and fuzzy set theory, we propose a integrated face recognition algorithm based on wavelet subspace. This method can make good use of the advantages of each single method, and also can make up for the defect of each other. The comparison of the results of the different methods identification effect on the ORL、YALE and FERET face database show, the integrated method proposed in this paper improves the recognition rate, and it also reduces the training and classification time as well.

Aerodynamic analysis on the step types of a railway tunnel with non-uniform cross-section

Wenhui Li,Tanghong Liu,Xiaoshuai Huo,Zijian Guo,Yutao Xia 한국풍공학회 2022 Wind and Structures, An International Journal (WAS Vol.35 No.4

The pressure-mitigating effects of a high-speed train passing through a tunnel with a partially reduced cross-section are investigated via the numerical approach. A compressible, three-dimensional RNG k-ε turbulence model and a hybrid mesh strategy are adopted to reproduce that event, which is validated by the moving model test. Three step-like tunnel forms and two additional transitions at the tunnel junction are proposed and their aerodynamic performance is compared and scrutinized with a constant cross-sectional tunnel as the benchmark. The results show that the tunnel step is unrelated to the pressure mitigation effects since the case of a double-step tunnel has no advantage in comparison to a single-step tunnel, but the excavated volume is an essential matter. The pressure peaks are reduced at different levels along with the increase of the excavated earth volume and the peaks are either fitted with power or logarithmic function relationships. In addition, the Arc and Oblique-transitions have very limited gaps, and their pressure curves are identical to each other, whereas the Rec-transition leads to relatively lower pressure peaks in CP max, CP min, and ΔCP, with 5.2%, 4.0%, and 4.1% relieved compared with Oblique-transition. This study could provide guidance for the design of the novel railway tunnel.

双减政策背景下中国小学教师工作量实证研究

李芬(Fen Li),李文慧(Wenhui Li) YIXIN 출판사 2023 教育教学研究论丛 Vol.1 No.2

新教育政策的实施会对教师工作量产生影响,双减政策实施以来,成效斐然,但学生减负的同时,教师却在“加压”,中小学教师工作量巨大,压力负担过重,为教师“减负”迫在眉睫。本研究立足新教育变革当下,深入一线教师群体,对小学教师工作量进行实证取证,找出教师工作背后的差异与困境,维护教师权益,真正做到“减负增效”,进一步激发教师积极性,以便社会各界及上级主管部门有正确的认识,关注中小学教师身心健康,合理分配教师工作量,切实提高中小学的教育教学质量。 The implementation of the new education policy affects the workload of teachers. Since the implementation of the double reduction policy, remarkable results have been achieved, however students reduce the workload and teachers are “pressurized” simultaneously. The teachers in primary and secondary schools suffers from heavy workload and pressure. Therefore, it is urgent to “reduce the workload” of teachers. Based on the new education revolution, this study collected the empirical evidence of teachers’ workload from front-line primary school teachers. This study aims to find out the differences and difficulties behind the teachers’ work, to maintain the rights and interests of teachers, and to further motivate the teachers’ enthusiasm concurrently. This study can provide the key information for society and competent department. Then, they can correctly understand situation and pay more attention to teachers’ physical and mental health, and reasonably distribute the teachers’ workload to effectively improve the quality of education and teaching of the primary and secondary schools.

A Novel Material Fluorescence Probe Based on Covalently Functionalized Graphene Oxide by Aminocoumarin for Detection of CN-

Wenhui Ma,Zhaochuan Yu,Zhongcai Li,Jing Wen,Baoru Zhao,Yong Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.03

Owing to the hazardness, the sensitive and selective detection of cyanide (CN-) in water or water-containing systems has still been a puzzle plaguing scientists all around the world. In this paper, a novel fluorescence probe based on covalently functionalized graphene oxide (GO) by aminocoumarin for highly selective detection of CN- in deionized water was prepared under the action of EDC/NHS. This probe bears aminocoumarin group as the recognition site and fluorophore, and its fluorescence quantum yield is increased by 0.07. Simultaneously, by loading on GO, the dispersibility, selectivity and reversibility were soundly improved, which facilitated the detection process. The fluorescence spectra showed that the probe has high selectivity and sensitivity for cyanide, and has potential application in real water.