Humidity and temperature control with fuzzy logic to increase PEMFC power

Wei-Wei Yuan,Kai Ou,Young-Bae Kim 한국에너지학회 2017 한국에너지공학회 학술발표회 Vol.2017 No.4

Diversity of Arbuscular Mycorrhizal Fungi Associated with a Sb Accumulator Plant, Ramie (Boehmeria nivea), in an Active Sb Mining

( Yuan Wei ),( Zhi Peng Chen ),( Feng Chang Wu ),( Ji Ning Li ),( Yu Xian Shangguan ),( Fa Sheng Li ),( Qing Ru Zeng ),( Hong Hou ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.8

Arbuscular mycorrhizal fungi (AMF) have great potential for assisting heavy metal hyperaccumulators in the remediation of contaminated soils. However, little information is available about the symbiosis of AMF associated with an antimony (Sb) accumulator plant under natural conditions. Therefore, the objective of this study was to investigate the colonization and molecular diversity of AMF associated with the Sb accumulator ramie (Boehmeria nivea) growing in Sb-contaminated soils. Four Sb mine spoils and one adjacent reference area were selected from Xikuangshan in southern China. PCR-DGGE was used to analyze the AMF community composition in ramie roots. Morphological identification was also used to analyze the species in the rhizosphere soil of ramie. Results obtained showed that mycorrhizal symbiosis was established successfully even in the most heavily polluted sites. From the unpolluted site Ref to the highest polluted site T4, the spore numbers and AMF diversity increased at first and then decreased. Colonization increased consistently with the increasing Sb concentrations in the soil. A total of 14 species were identified by morphological analysis. From the total number of species, 4 (29%) belonged to Glomus, 2 (14%) belonged to Acaulospora, 2 (14%) belonged to Funneliformis, 1 (7%) belonged to Claroideoglomus, 1 (7%) belonged to Gigaspora, 1 (7%) belonged to Paraglomus, 1 (7%) belonging to Rhizophagus, 1 (7%) belonging to Sclervocystis, and 1 (7%) belonged to Scutellospora. Some AMF sequences were present even in the most polluted site. Morphological identification and phylogenetic analysis both revealed that most species were affiliated with Glomus, suggesting that Glomus was the dominant genus in this AMF community. This study demonstrated that ramie associated with AMF may have great potential for remediation of Sb-contaminated soils.

Outcomes of limited period of adalimumab treatment in moderate to severe Crohn’s disease patients: Taiwan Society of Inflammatory Bowel Disease Study

( Wei-chen Lin ),( Jen-wei Chou ),( Hsu-heng Yen ),( Wen-hung Hsu ),( Hung-hsin Lin ),( Jen-kou Lin ),( Chiao-hsiung Chuang ),( Tien-yu Huang ),( Horng-yuan Wang ),( Shu-chen Wei ),( Jau-min Wong ) 대한장연구학회 2017 Intestinal Research Vol.15 No.4

Background/Aims: In Taiwan, due to budget limitations, the National Health Insurance only allows for a limited period of biologics use in treating moderate to severe Crohn’s disease (CD). We aimed to access the outcomes of CD patients following a limited period use of biologics, specifically focusing on the relapse rate and remission duration; also the response rate to second use when applicable. Methods: This was a multicenter, retrospective, observational study and we enrolled CD patients who had been treated with adalimumab (ADA) according to the insurance guidelines from 2009 to 2015. Results: A total of 54 CD patients, with follow-up of more than 6 months after the withdrawal of ADA, were enrolled. The average period of treatment with ADA was 16.7±9.7 months. After discontinuing ADA, 59.3% patients suffered a clinical relapse. In the univariate analysis, the reason for withdrawal was a risk factor for relapse (P=0.042). In the multivariate analysis, current smoker became an important risk factor for relapse (OR, 3.9; 95% CI, 1.2-14.8; P=0.044) and male sex was another risk factor (OR, 2.9; 95% CI, 1.1-8.6; P=0.049). For those 48 patients who received a second round of biologics, the clinical response was seen in 60.4%, and 1 anaphylaxis occurred. Conclusions: Fifty-nine percent of patients experienced a relapse after discontinuing the limited period of ADA treatment, and most of them occurred within 1 year following cessation. Male sex and current smoker were risk factors for relapse. Though 60.4% of the relapse patients responded to ADA again. (Intest Res 2017;15:487-494)

Effects of Micro Textured Sapphire Tool Regarding Cutting Forces in Turning Operations

Yuan Wei,Simon S. Park,김미루,이득우,Chaneel Park 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.4 No.2

In this study, the effects of microscale textures on a sapphire cutting tool were investigated. The texturing of microscale features on a solid surface allowed control of the tribological characteristics of the tool surface. Microscale geometrical characteristics on the rake face of the sapphire tools were obtained through micro-abrasive blasting. Tribological tests and cutting tests on an aluminum alloy workpiece were carried out, and the cutting forces were measured and analyzed. The effect of texture on adhesion of work material was investigated. Results showed that friction was minimized and cutting forces at the tool-chip interface of the textured tool were significantly reduced from those of a conventional tool. It was observed that the adhesion of work material was reduced by applying texture on the tool rake face.

Buckling Analysis of Steel H Column with Thermal Gradient Along the Flanges

Wei-bin Yuan,Pei-jun Ge,Yue-ting Shen,Shan-shan Cheng,Nan-ting Yu 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.2

This paper presents an analytical study about the axial compression buckling of H-section columns with one side of the flanges exposed to fire. The fire-induced thermal gradient along the flanges is obtained by using simplified Fourier heat conduction equation. The pre-buckling stress and bowing effect due to the non-uniform temperature distribution through the cross-section is considered. The analysis is accomplished by using the Rayleigh–Ritz method. The analytical solution is validated by finite element analysis using ANSYS. Finally, the parametric study is performed for different sections including different values of length, thickness ratio and width-to-height ratio.

Nonlinear Instability of Angle Section Beams under Uniformly Distributed Loads

Wei-bin Yuan,Wei Zhang,Jie Xu,Nan-ting Yu 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.2

This paper presents a study on the flattening behavior of angle-section beams of finite length subjected to uniformly distributed transverse loads. Analytical solutions for static instabilities of angle-section beams when they are bent about their weak axis are derived using energy methods. The basic assumptions used in the present study are that the total strain energy of an angle-section beam subjected to a uniformly distributed load can be simplified into a two-stage process. One is the bending response of the two legs behaving as the plate; the other is the bending response as a beam with flattened section. The nonlinear instability is derived by applying the minimum potential energy principle and the corresponding static critical moments associated with the section flattening-induced buckling are determined. To validate the analytical solution developed, nonlinear finite element analyses are also conducted. Good agreement between the present solution and the FEA results is demonstrated.

Numerical analysis of the dynamic behavior of a rotor-bearing-brush seal system with bristle interference

Yuan Wei,Shulin Liu 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.8

To minimize leakage and maintain the efficiency of turbomachinery, brush seal can be installed with zero clearance or interference as the flexibility. This leads to contact between the rotor and bristle pack, and may cause self-excited vibration, even instability. In this study, to establishment a mathematical model of the rotor system, a seal force model with bristle interference is proposed and the nonlinear oilfilm force is applied in view of short bearing assumption. The influences of main factors containing rotor rotational speed, installing interval, disc mass, and disk eccentricity on the nonlinear characteristics of the rotor-bearing-brush seal system are conducted by adopting bifurcation diagram, spectrum cascade, axis orbit, and Poincaré map. The results indicate that the vibration amplitude of the system with bristle interference is a bit larger than that without interference. The system stability is enhanced with smaller disk mass at a higher rotational speed. The proposed model could provide valuable reference for the design of a rotor-bearing-seal system.

Analysis of China's Solar Power Industry Development Strategy and Current Issues in the Post-Corona Era

Yuan-Yuan HU,이양기,Wei-Lun Fu 한국아시아학회 2022 아시아연구 Vol.25 No.1

The 2020 COVID-19 pandemic has impacted the global development in economic, political, social and others, as well as promoting countries to reflect on the direction of economic transition. Post-pandemic green economic recovery has become the consensus of the global, but it puts pressure on the challenges to response to global climate change. Thus, the development of renewable energy represented by solar photovoltaic(PV) industry has once again received strong support from all countries. China has abundant solar energy resources and has listed the solar PV industry as one of the national strategic emerging industries. China's solar PV industry has developed rapidly in the past two decades. This article explains the relevant policy of solar PV industry guided by the 14th Five-Year Plan(FYP) as a benchmark and compares its with the 12th/13th FYP policies to show the status of solar PV industry development before and after COVID-19 in China. In addition, under the guidance of the 14th FYP policies, this paper further analyzes the challenges and explores the opportunities of China's solar PV industry development in the post-pandemic era. Finally, this article provides helpful insights for solving the challenges that exist on the pathway to China’s solar PV industry development during the 14th FYP period.

중국 IP(Intellectual Property)영화 작품의 창작 트렌드

Wei, Si-Yuan,Song, Seung-Keun 한국정보통신학회 2020 한국정보통신학회논문지 Vol.24 No.2

Recently, IP (Intellectual Property) films have attracted much attention in the Chinese film market. This raises the need to take intellectual property films seriously in academic terms. The purpose of this study is to explore the effective methodology of content development based on intellectual property by analyzing the recent trend of Chinese intellectual property films. Recently, the driving force of the development of Chinese intellectual property films was analyzed, and the trend of Chinese intellectual property films was analyzed. The results of this study criticized the fragmented problems caused by the development of intellectual property films. This study made practical and academic suggestions to contribute to the healthy development of the intellectual property film market.

Nonlinear Bending of Box Section Beams of Finite Length Under Uniformly Distributed Loading

Wei-bin Yuan,Zhao-shui Bao,Nan-ting Yu,Shuang-shuang Zhu,Li-ping Wu 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.2

In this paper, the bending response of box-section beams of finite length is investigated by using energy methods. The basic assumptions used in the present study are that the total strain energy of a box-section beam subjected to uniformly distributed loading can be simplified into a two-stage analysis process. One is the local bending response of the webs and flanges behaving as plates; the other is the overall bending response of the beam with a deformed cross-section. Analytical solutions for both static and dynamic instabilities of box section beams of finite length subjected to transverse uniformly distributed loading are derived by applying the minimum potential energy principle. To validate the analytical solutions developed, geometric nonlinear finite element analyses are also conducted. Good agreement between the present solutions and the FEA results is demonstrated. Finally, the effects of beam length on the limit critical uniformly distributed load are also discussed.