On the Signal Analysis of Two Waterfall Sounds in Australia's Broken Falls

Zhixing Tian,MyungJin Bae 국제문화기술진흥원 2020 International Journal of Advanced Culture Technolo Vol.8 No.4

More and more people are paying attention to the psychological pleasure and relaxation that sound hearing brings. In most cases, humans seem to have a special preference for natural sounds. Natural sounds are mainly white noise and pink noise such as wind, rain, waves, waterfall sounds, etc. All of these are often considered to be beneficial to human health, but in reality the same category of natural sounds is no different. It will be very different due to space, time and other factors. Each sound can be unique, so people's hearing experience is also different. This paper quantitatively analyzes the spectrum and brain waves to analyze the feeling of hearing the natural Broken Falls sound. In particular, we aim to objectively analyze the objective feeling of Broken Falls sound falling on the human auditory system through sound spectrum and brain waves..

On a Reading Aloud to Relieve the Decrease in Blood Oxygen Saturation when Jogging

Zhixing Tian,MyungJin Bae 국제문화기술진흥원 2020 International Journal of Advanced Culture Technolo Vol.8 No.4

Recently, the problem of hypoxia caused by jogging is attracting attention. To solve this problem, this paper proposed a new solution. This paper proved that as a vocalization method of reading aloud, it is possible to increase air intake and activate lung function to exchange more air and obtain more oxygen. Then, blood oxygen saturation was used as an evaluation index for the body's oxygen content level to prove its effectiveness. A photoelectric pulse oximeter developed on the basis of different light absorption principles in blood was used to test blood oxygen saturation. Experimental results show that a certain degree of hypoxia is induced when a lot of oxygen is required due to jogging. Therefore, it was proved that the new vocal breathing method by reading books can increase the blood oxygen saturation of the body and improve the hypoxia of the body. Reading vocal breathing is a simple and efficient oxygen saturation recovery breathing method.

Study on hair dryer thermal vibration massage to make shaving more comfortable

Tian, Zhixing,You, Kwang-Bock,Bae, Myung-Jin The International Promotion Agency of Culture Tech 2021 International Journal of Advanced Culture Technolo Vol.9 No.2

When shaving, it is easy to suffer shaving burns, that is, facial burn irritation during shaving. The reason is that the razor blade irritates the skin. The current solution is to make the razor sharper and use a razor with a blade heating function. Although these ways can increase the comfort of shaving, they will also greatly increase shaving costs. This paper proposes using a hairdryer to massage the skin before shaving to reduce skin irritation during shaving. This is a simple, practical and low-cost method. The hair dryer's heat, sound, and wind energy have a massage effect, and they can make shaving easier and more comfortable. For analyzing shaving effect, two evaluation methods are used, which are sound spectrum analysis and mos. The sound spectrum analysis is used to analyze the working status of the razor objectively. The MOS test can reflect the subjective feelings of the subject on the shaving's comfort. The results show that the hairdryer thermal vibration massage can make the beard easier to cut, thereby reducing the irritation of the razor to the skin and improving shaving comfort.

Study on the shouting breathing pattern while jogging wearing a mask

Tian, Zhixing,Bae, Myung-Jin The International Promotion Agency of Culture Tech 2021 International Journal of Advanced Culture Technolo Vol.9 No.2

Because of the COVID-19 epidemic, many countries have made the obligation to wear masks normal. Wearing masks in public places has become a must. At present, wearing a mask to participate in sports makes it very common. People seek to gain health through exercise but ignore the potential respirato-ry health threat. That is, wearing a mask will cause a decrease in oxygen content in the body. This neg-ative impact becomes more prominent as the wear-ing time and oxygen consumption increase. To pro-tect people from viruses and enjoy a healthy life. This paper proposes a breathing pattern that im-proves blood oxygen saturation while wearing a jogging mask and walking. Namely, shouting breathing pattern. Use a pulse oximeter to measure the blood oxygen saturation of running at different speeds and compare the normal breathing pattern and the shouting breathing pattern. The results show that the shouting breathing pattern has a sig-nificant improvement in the blood oxygen satura-tion of low-speed walking and medium-speed jog-ging.

Objectives, challenges, and prospects of batch processes: Arising from injection molding applications

Yuanqiang Zhou,Zhixing Cao,Jingyi Lu,Chunhui Zhao,Dewei Li,Furong Gao 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.12

Injection molding, a polymer processing technique that converts thermoplastics into a variety of plasticproducts, is a complicated nonlinear dynamic process that interacts with a different group of variables, including themachine, the mold, the material, and the process parameters. As injection molding process operates sequentially inphases, we treat it as a batch process. The review paper discusses the batch nature of injection molding and identifies thethree main objectives for future development of injection molding: higher efficiency, greater profitability, and longer sustainability. From the perspective of system engineering, our discussion centers on the primary challenges for the batchoperation of injection molding systems: 1) Model development in face of product changes, 2) Control strategies in face ofdynamic changes, 3) Data analysis and process monitoring, and 4) Safety assurance and quality improvement, and thecurrent progress that has been made in addressing these challenges. In light of the advancement of new informationtechnologies, this paper provides several opportunities and encourages further research that may break existing capabilitylimits and develop the next generation of automation solutions to bring about a revolution in this area.

Degradation of organic micropollutant by vacuum ultraviolet process: a kinetics study

Laxiang Yang,Yuxin Feng,Zhixing Gao 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.8

Vacuum ultraviolet (VUV) process has been regarded as a novel advanced oxidation process for its unique way of generating HO• via direct photolysis of water. This study investigates the kinetics of the VUV process for degradation of a typical pesticide, glyphosate (GLY), by using a photoreactor equipped with a precision sampler. The precision sampler enables us to take samples at distances ranging from 0.1 to 1.5 cm to the irradiation source so that GLY degradation by VUV in different parts of the reaction volume can be evaluated. The results of experiments on H2O2 production from VUV photolysis of water confirmed that there existed an extremely uneven distribution of VUV flux and HO• generated in the VUV process. Enhancing mass transfer by agitation could significantly increase GLY degradation efficiency by improving the distribution of HO•. The initial concentrations of water and GLY governed the reaction kinetics of GLY degradation in the VUV process. As the solution pH increased from 5.0 to 9.0, the overall degradation efficiency of GLY decreased from 97.6% to 77.8%. Depending on their molar absorption coefficients, inorganic anions affected adversely on the degradation of GLY by VUV in the order of NO3 >HCO3  (alkalinity)>Cl>SO4 2. As a strong HO• scavenger, natural organic matter shows a much more adverse impact on GLY degradation than that of inorganic anions. Based on the experimental results, this study has provided insights into the kinetics of VUV process for pollutant degradation.

Analytical approaches to eddy current nondestructive evaluation for stratified conductive structures

Jianhai Zhang,Maodan Yuan,Zhixing Xu,김학준,송성진 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10

The excitation and propagation of an electromagnetic field is a very complex problem in Stratified conductive structures (SCS) becauseof their complicated physical properties. In single air-cored coil above multilayered conductive structures, the impedance of aneddy-current coil is calculated based on the electromagnetic field. This paper provides insight into eddy current models for stratified conductivestructures using three types of analytical approaches, including Cheng’s matrix method, Truncated region eigenfunction expansion(TREE) method, and the innovative method based on the reflection and transmission theory of the electromagnetic waves. The analyticalexpressions of the three models are discussed and compared. Numerical simulation of an FEM model is performed, and the experimentalresults verify the developed models.

The Development of High-Current Power Supply System for Electrolytic Copper Foil

An Luo,Fujun Ma,Qiaopo Xiong,Zhixing He 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.2

A 6.5 V/50 kA high-frequency switching power supply (HSPS) system composed of 10 power modules is developed to meet the requirements of copper-foil electrolysis. The power module is composed of a two-leg pulse width modulation (PWM) rectifier and a DC/DC converter. The DC/DC converter adopts two full-wave rectifiers in parallel to enhance the output. For the two-leg PWM rectifier, the ripple of the DC-link voltage is derived. A composite control method with a ripple filter is then proposed to effectively improve the performance of the rectifier. To meet the process demand of copper-foil electrolysis, the virtual impedance-based current-sharing control method with load current full feedforward is proposed for n-parallel DC/DC converters. The roles of load current feedforward and virtual impedance are analyzed, and the current-sharing control model of the HSPS system is derived. Virtual impedance is used to adjust the current-sharing impedance without changing the equivalent output impedance, which can effectively reduce current-sharing errors. Finally, simulation and experimental results verify the structure and control method.

Numerical Investigations of Turbulent Flows around Hydrofoil by Using Implicit Large Eddy Simulation

Xuelin Tang,Gao Hui,Wu Zhixing,Hao Man,Shi Xiaoyan,Li Xiaoqin 한국유체기계학회 2018 International journal of fluid machinery and syste Vol.11 No.3

Based on Implicit Large Eddy Simulation (ILES), the Adaptive Local Deconvolution Method (ALDM) was proposed to develop an implicit Sub-Grid Scale (SGS) model for three-dimensional (3D) turbulent unsteady flow around the NACA0012 Hydrofoil at a high Reynolds number of 2400,000. With the help of User Define Function (UDF) of the Fluent CFD software, the 3D turbulent unsteady flows were carried out by using ILES and LES respectively. The lift coefficients predicted by both models were in good agreement with the experimental data and the relative error of lift coefficient predicted by both models decreases firstly and then increases with the increase of the incident angle, but the numerical results by ILES were more close to the experimental, which verified the feasibility and accuracy of the ILES model. In addition, the predicted pressure contour and streamline distributions by ILES and LES at different incident angles in a wide range were also investigated further. The larger of the incident angle, the production and shedding of the vortex are stronger. The predicted results by both the models have the similar tendency, and the ILES could more finely capture the flow patterns. For a large incident angle of 20°, the internal flow analyses by ILES could well reproduce the whole process of the vortex from generation to development and shedding around the hydrofoil.

Influences of genetically perturbing synthesis of the typical yellow pigment on conidiation, cell wall integrity, stress tolerance, and cellulase production in Trichoderma reesei

Zhang Weixin,An Ning,Guo Junqi,Wang Zhixing,Meng Xiangfeng,Liu Weifeng 한국미생물학회 2021 The journal of microbiology Vol.59 No.4

The prominent protein producing workhorse Trichoderma reesei secretes a typical yellow pigment that is synthesized by a gene cluster including two polyketide synthase encoding genes sor1 and sor2. Two transcription factors (YPR1 and YPR2) that are encoded in the same cluster have been shown to regulate the expression of the sor genes. However, the physiological relevance of the yellow pigment synthesis in T. reesei is not completely clear. In this study, a yellow pigment hyper-producer OEypr1 and three yellow pigment non-producers, OEypr1-sor1, Δypr1, and OEypr2, were constructed. Their phenotypic features in mycelial growth, conidiation, cell wall integrity, stress tolerance, and cellulase production were determined. Whereas hyperproduction of the yellow pigment caused significant defects in all the physiological aspects tested, the non-producers showed similar colony growth, but improved conidiation, maintenance of cell wall integrity, and stress tolerance compared to the control strain. Moreover, in contrast to the severely compromised extracellular cellobiohydrolase production in the yellow pigment hyperproducer, loss of the yellow pigment hardly affected induced cellulase gene expression. Our results demonstrate that interfering with the yellow pigment synthesis constitutes an engineering strategy to endow T. reesei with preferred features for industrial application.