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Search Results: 1 - 10 of 103593 matches for " Wei-Cheng Lin "
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Design and Evaluation of Photo-Induced Biofeedback Fabric for the Enhancement in Sleeping Sense
Wei-Cheng Chu,Hsin-Ju Lin,Shu-Ping Chiu
Advances in Materials Science and Engineering , 2013, DOI: 10.1155/2013/673123
Abstract: Based on overcoming the sleeping obstacle for people, the purpose of this study is to design a photo-induced biofeedback fabric which is a kind of optical fiber fabric with the function of enhancing sleeping sense and to evaluate its effect. The fabrics with two layers including background layer and pattern layer were designed firstly. The pattern layers with 3 kinds of wavelengths of sine waves and the light controller with 3 kinds of flashing frequencies were then prepared. Guiding the light into the optical fiber, it will emit out of the optical fiber and stimulate our visual system to change the form of brain wave. Finally, EEG and sleeping scale were applied to evaluate the effect of enhancing sleeping sense. The results were shown that human’s brain wave can be changed from sober status to shallow-sleeping status and the effect of enhancing sleeping sense can be achieved for all pattern layers in frequencies of 0, 5 and 10?Hz. Furthermore, female is more significant than male and participants age from 30 to 49 are the most significant. Besides, the stronger the participant’s stress is, the more significant the sleeping sense is. 1. Introduction According to the investigation of Taiwan Society of Sleep Medicine (TSSM), more than 4.5 million people have sleeping obstacle and 2.5 million people have suffered from chronic insomnia in Taiwan in 2006. Only a few people would like to consult doctors for this general issue. Therefore, how to enhance sleeping sense by using an effective and natural method has become an important issue and needs to be studied. Because the sleeping quality is strongly relative to stress [1, 2], stress relaxation and providing sound sleeping quality are the main aims of this paper. In general, methods of stress relaxation are listed as follow: medical control treatment, exercise and homework treatment, breathing control treatment, musical treatment, Biofeedback treatment, and so forth [3, 4]. The principle of Biofeedback was adopted in this paper and was applied to train the people with sleeping obstacle to realize that it is their own ability to exercise self-control and self-adjustment, as well as it is also to make them understand that it is one’s own responsibility to overcome this stress problem [5–7]. Referring to the aforesaid method of biofeedback treatment, a unique home decoration fabric with the functions of stress relaxation and sleeping sense enhancement was created by the combination of textile, photoelectric system, and medical technology. This is in a way with the hope to stimulate the activity of the brain
Integrating the TRIZ and Taguchi's Method in the Optimization of Processes Parameters for SMT
Yung-Tsan Jou,Wen-Tsann Lin,Wei-Cheng Lee,Tsu-Ming Yeh
Advances in Materials Science and Engineering , 2013, DOI: 10.1155/2013/830891
Abstract: SMT is an assembly technology for core circuit board parts. Unless process parameters are effectively controlled, poor solderability may result in a decline in product quality. This study looks at an SMT manufacturing process in a multinational company. First, the TRIZ contradiction matrix is revised to investigate the association between the 39 parameters in the contradiction matrix and 13 parameters that influence the unevenness of solder paste in the solder paste printing process. Expert verification is then used to screen the key factors affecting the quality of SMT, which are then combined with Taguchi's method to identify the optimal parameter set influencing the thickness of SMT solder paste. Results. TRIZ identifies squeegee pressure, ejection speed, squeegee speed, and squeegee angle as the four parameters with the greatest influence on SMT solder paste thickness. Taguchi's method is used to identify the optimum levels set for the experimental factors and carry out confirmation experiments. The S/N ratio improved from 21.732?db to 26.632?db, while the mean also improved from the current 0.163?mm to 0.155?mm, close to the target value of 0.15?mm. The results show that applying TRIZ and Taguchi's method for the purpose of product improvement is feasible. 1. Introduction Today, product cycles are short and undergo rapid changes. Consumer electronic products, such as smart phones, notebook computers, and digital cameras, play an important role in our everyday lives. As consumers become more demanding, there is an increasing emphasis on lighter, thinner, high quality, and low-priced products that can be delivered to the consumer quickly. In addition, due to global competition, businesses are increasingly demanding rigorous quality standards to meet customer’s demand [1, 2]. To meet the demand for light, thin, short, and small electronic products, print circuit boards (PCB) have evolved from single-layer to multilayer boards, with a consequent reduction in their size. As a result, most traditional plated-through hole parts are gradually falling out of use. An effective solution to this is to attach electronic components onto the PCB, resulting in the development of surface mount technology (SMT). However, unless process parameters are effectively controlled, poor solderability may result in a decline in product quality. For example, if insufficient solder paste is deposited at the PCB printing stage, the strength of the solder joints may be inadequate or an empty solder phenomenon may occur. However, if too much solder paste is deposited, bridges may
Nonlinear stability of centered rarefaction waves of the Jin-Xin relaxation model for 2X2 conservation laws
Wei-Cheng Wang
Electronic Journal of Differential Equations , 2002,
Abstract: We study the asymptotic equivalence of the Jin-Xin relaxation model and its formal limit for genuinely nonlinear $2imes 2$ conservation laws. The initial data is allowed to have jump discontinuities corresponding to centered rarefaction waves, which includes Riemann data connected by rarefaction curves. We show that, as long as the initial data is a small perturbation of a constant state, the solution for the relaxation system exists globally in time and converges, in the zero relaxation limit, to the solution of the corresponding conservation law uniformly except for an initial layer.
Superconductivity-Induced Changes in Density-Density Correlation Function Enabled by Umklapp Processes
Wei-Cheng Lee
Physics , 2015, DOI: 10.1103/PhysRevB.91.224503
Abstract: Motivated by the mid-infrared scenario for high-temperature superconductivity proposed by Leggett, the effects of Umklapp processes on the density-density correlation function in the presence of long-range Coulomb interaction have been investigated on a microscopic model. We show that because Umklapp processes enable scatterings that conserve total momentum only up to $n\vec{K}$, where $n$ is an integer and $\vec{K}$ is the reciprocal wave vector, significant amounts of spectral weight in the plasmonic excitations at long wavelength are transferred into lower frequency around mid-infrared regime. We further find that regardless of the gap symmetry, superconductivity generally suppresses the Umklapp scatterings due to the formation of the electron pairing. This suppression is unique for the superconductivity due to the interplay between electron pairing and the odd parity of the matrix elements associated with Umklapp channels, which usually does not occur in other known competing orders. Specific predictions for the experimental signatures in optical conductivity and electron energy loss spectroscopy (EELS) will be discussed.
SnCl2/TiCl3-Mediated Deoximation of Oximes in an Aqueous Solvent
Mei-Huey Lin,Han-Jun Liu,Cheng-Yu Chang,Wei-Cheng Lin,Tsung-Hsun Chuang
Molecules , 2012, DOI: 10.3390/molecules17032464
Abstract: A simple procedure for SnCl2/TiCl3-mediated deoximation of ketoximes in an aqueous solvent is reported. Under the conditions developed in this effort, various ketones and aldehydes are produced in good to excellent yields.
Preparation and Characterization of Ferrofluid Stabilized with Biocompatible Chitosan and Dextran Sulfate Hybrid Biopolymer as a Potential Magnetic Resonance Imaging (MRI) T2 Contrast Agent
Zei-Tsan Tsai,Fu-Yuan Tsai,Wei-Cheng Yang,Jen-Fei Wang,Chao-Lin Liu,Chia-Rui Shen,Tzu-Chen Yen
Marine Drugs , 2012, DOI: 10.3390/md10112403
Abstract: Chitosan is the deacetylated form of chitin and used in numerous applications. Because it is a good dispersant for metal and/or oxide nanoparticle synthesis, chitosan and its derivatives have been utilized as coating agents for magnetic nanoparticles synthesis, including superparamagnetic iron oxide nanoparticles (SPIONs). Herein, we demonstrate the water-soluble SPIONs encapsulated with a hybrid polymer composed of polyelectrolyte complexes (PECs) from chitosan, the positively charged polymer, and dextran sulfate, the negatively charged polymer. The as-prepared hybrid ferrofluid, in which iron chloride salts (Fe 3+ and Fe 2+) were directly coprecipitated inside the hybrid polymeric matrices, was physic-chemically characterized. Its features include the z-average diameter of 114.3 nm, polydispersity index of 0.174, zeta potential of ?41.5 mV and iron concentration of 8.44 mg Fe/mL. Moreover, based on the polymer chain persistence lengths, the anionic surface of the nanoparticles as well as the high R2/R1 ratio of 13.5, we depict the morphology of SPIONs as a cluster because chitosan chains are chemisorbed onto the anionic magnetite surfaces by tangling of the dextran sulfate. Finally, the cellular uptake and biocompatibility assays indicate that the hybrid polymer encapsulating the SPIONs exhibited great potential as a magnetic resonance imaging T2 contrast agent for cell tracking.
Prevalence of A2143G mutation of H. pylori-23S rRNA in Chinese subjects with and without clarithromycin use history
Zhuoqi Liu, Jing Shen, Lian Zhang, Lin Shen, Qiang Li, Baozhen Zhang, Jing Zhou, Liankun Gu, Guoshuang Feng, Junling Ma, Wei-Cheng You, Dajun Deng
BMC Microbiology , 2008, DOI: 10.1186/1471-2180-8-81
Abstract: The presence of 23S rRNA due to H. pylori infection in the OA group remained lower than that in the placebo group 7.3 yrs after OA-therapy [51.1% (157/307) vs. 83.9% (260/310), p = 0.0000]. In the OAC group, the 23S rRNA detection rate was 26.8% (41/153) three yrs after OAC-treatment. The A2143G mutation rate among the 23S rRNA-positive subjects in the OAC group [31.7% (13/41)] was significantly higher than that in the OA group [10.2% (16/157)] and the placebo group [13.8% (36/260)]. The frequency of the AAGGG → CTTCA (2222–2226) and AACC → GAAG (2081–2084) sequence alterations in the OAC group was also significantly higher than those in the OA group and the placebo group.Primary prevalence of the A2143G mutation was 10~14% among Chinese population without history of CLR therapy. Administration of CLR to eliminate H. pylori infection increased the prevalence of the A2143G mutation in Chinese subjects (32%) significantly.Helicobacter pylori (H. pylori) infection occurs worldwide. The prevalence of infection by H. pylori varies greatly among countries, with over a 70% infection rate in many developing countries compared to 20% to 50% in most industrialized nations. H. pylori infection can lead to gastritis, duodenal and gastric ulcer, gastric carcinoma, and gastric lymphoma [1-3]. Gastric cancer risks can be reduced by up to 60% by eradication of H. pylori infection through primary prevention, thus affecting approximately 800,000 gastric cancer patients worldwide [4,5].Currently, a seven-day, triple-drug regimen has been recommended as one of the first-line therapies for H. pylori management [6,7]. This treatment includes omeprazole (a proton-pump inhibitor), clarithromycin (CLR), and amoxicillin. However, this therapy is being investigated because of increased eradication failures due to the prevalence of CLR-resistant (CLRr) H. pylori infections. Many studies have shown that between 0–50% of H. pylori isolates were CLRr, which leads to a need for long term assessmen
WW Domain Containing E3 Ubiquitin Protein Ligase 1 (WWP1) Negatively Regulates TLR4-Mediated TNF-α and IL-6 Production by Proteasomal Degradation of TNF Receptor Associated Factor 6 (TRAF6)
Xiao-Wen Lin, Wei-Cheng Xu, Jian-Gang Luo, Xue-Jiao Guo, Tao Sun, Xu-Li Zhao, Zhi-Jian Fu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0067633
Abstract: Background Toll-like receptors (TLRs) play a pivotal role in the defense against invading pathogens by detecting pathogen-associated molecular patterns (PAMPs). TLR4 recognizes lipopolysaccharides (LPS) in the cell walls of Gram-negative bacteria, resulting in the induction and secretion of proinflammatory cytokines such as TNF-α and IL-6. The WW domain containing E3 ubiquitin protein ligase 1 (WWP1) regulates a variety of cellular biological processes. Here, we investigated whether WWP1 acts as an E3 ubiquitin ligase in TLR-mediated inflammation. Methodology/Results Knocking down WWP1 enhanced the TNF-α and IL-6 production induced by LPS, and over-expression of WWP1 inhibited the TNF-α and IL-6 production induced by LPS, but not by TNF-α. WWP1 also inhibited the IκB-α, NF-κB, and MAPK activation stimulated by LPS. Additionally, WWP1 could degrade TRAF6, but not IRAK1, in the proteasome pathway, and knocking down WWP1 reduced the LPS-induced K48-linked, but not K63-linked, polyubiquitination of endogenous TRAF6. Conclusions/Significance We identified WWP1 as an important negative regulator of TLR4-mediated TNF-α and IL-6 production. We also showed that WWP1 functions as an E3 ligase when cells are stimulated with LPS by binding to TRAF6 and promoting K48-linked polyubiquitination. This results in the proteasomal degradation of TRAF6.
Analysis on population surviving process of Changium smyrnioides, an endangered plant
濒危植物明党参种群生存过程研究

LI Wei-Cheng,
李伟成

生态学报 , 2004,
Abstract: Changium smyrnioides Wolff, a monotypic species of Umbellaceae, occurs only in a narrow zone in the eastern to middle part of the Yangtze River Basin, south part of China. As a result of human activity and its biological characteristics, C. smyrnioides has already become an endangered species. It is important to understand the basic life history and growth process as well as endangered mechanism. Because of the difficulty in estimating the age of C. smyrnioides individuals, a Logistic Growth Model was used ...
A NEW VARIETY OF PUCCINIA IRIDIS WALLR.AND A NEW RECORD OF PUCCINIA FOR CHINA
鸢尾柄锈菌一新变种及柄锈属国内一新记录

LIU WEI-CHENG,
刘伟成

菌物学报 , 1993,
Abstract: 本文报道采自东北地区的鸢尾柄锈菌一新变种和柄锈属一国内新记录种。新变种命名为鸢尾柄锈菌多孔变种Puccinia iridis (DC.) Wallr. Var. polyporis W. C. Liu var. nov.],区别于原变种的主要特征是其夏孢子小,芽孔5—7个,散生;而后者夏孢子较大,芽孔2—4个,赤道生。新记录种是短果茴芹柄锈菌(Puccinia pimpinellae-brachycarpae Tranzsch. Et Ere-meeva),寄生在短果茴芹(Pimpinella brachycarpa Nakai)上。标本保存于沈阳农业大学真菌标本室和中国科学院微生物研究所真菌标本室。
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