An Analysis Framework for Characterization of Electrical Power Data in Machining

Yulin Wang,Yan He,Yufeng Li,Ping Yan,Libin Feng 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.

Electrical power data of machining has become more and more vital due to the increasing concerns on the energy efficiency. As a kind of easily available real-time signal, electrical power data in machining involves diverse characteristics related to technical specification and operational production of machine tools and workpieces. To efficiently exploit the various characteristics involved in electrical power data, this paper proposes a framework to analyze characteristics of electrical power data in machining. Firstly, the sample experiment for turning the round stock on a lathe is carried out to investigate the characteristics implied in the real-time electrical power data. Based on it, a framework is derived to analyze characteristics from three aspects, energy-specific characteristic of machining, state-specific characteristic of machine tools and operation-specific characteristic of workpieces. The case with three scenarios is presented to demonstrate the potential applications of the framework, which is effectively utilized in analyzing energy consumption of machining, monitoring states of machine tools and automatically identifying the types of machining workpieces.

Personalized Educational Process Models with Spacing Effect

Mingwen Wang,Yulin Wang 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.1

Teaching new material and reviewing what has already been taught are two important activities in the educational process. Different students with different learning abilities need to review at different rates, that is to say, a personalized teaching process is necessary. Review has a spacing effect, namely it is most useful only if it is executed neither too soon nor too late. How should designers of educational software schedule the learning process to satisfy the need that different students learn different material? We present a mathematical model to capture the issue in idealized form. The learning abilities of students and the spacing effect of review are modeled as some input parameters’ constraints on the schedule. Our results include the optimal scheduling in accordance with which tutoring systems teach one student specific material, characteristics of the rate at which new material can be introduced under different conditions, and the reproduction of ladder-like educational process.

Calculation method and application of natural frequency of integrated model considering track-beam-bearing-pier-pile cap-soil

Yulin Feng,Yaoyao Meng,Wenjie Guo,Lizhong Jiang,Wang-Bao Zhou 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.49 No.1

A simplified calculation method of natural vibration characteristics of high-speed railway multi-span bridgelongitudinal ballastless track system is proposed. The rail, track slab, base slab, main beam, bearing, pier, cap and pile foundation are taken into account, and the multi-span longitudinal ballastless track-beam-bearing-pier-cap-pile foundation integrated model (MBTIM) is established. The energy equation of each component of the MBTIM based on Timoshenko beam theory is constructed. Using the improved Fourier series, and the Rayleigh-Ritz method and Hamilton principle are combined to obtain the extremum of the total energy function. The simplified calculation formula of the natural vibration frequency of the MBTIM under the influence of vertical and longitudinal vibration is derived and verified by numerical methods. The influence law of the natural vibration frequency of the MBTIM is analyzed considering and not considering the participation of each component of the MBTIM, the damage of the track interlayer component and the stiffness change of each layer component. The results show that the error between the calculation results of the formula and the numerical method in this paper is less than 3%, which verifies the correctness of the method in this paper. The high-order frequency of the MBTIM is significantly affected considering the track, bridge pier, pile soil and pile cap, while considering the influence of pile cap on the low-order and highorder frequency of the MBTIM is large. The influence of component damage such as void beneath slab, mortar debonding and fastener failure on each order frequency of the MBTIM is basically the same, and the influence of component damage less than 10m on the first fourteen order frequency of the MBTIM is small. The bending stiffness of track slab and rail has no obvious influence on the natural frequency of the MBTIM, and the bending stiffness of main beam has influence on the natural frequency of the MBTIM. The bending stiffness of pier and base slab only has obvious influence on the high-order frequency of the MBTIM. The natural vibration characteristics of the MBTIM play an important guiding role in the safety analysis of highspeed train running, the damage detection of track-bridge structure and the seismic design of railway bridge.

Transforming Inter-Organizational Information Systems into Electronic Commerce Marketplaces: Development of B2BElectronic Commerce in China’s Pharmaceutical Industry

리밍지,Yulin Tu,Xiaochen Wang,Kai Reimers 한국경영과학회 2005 Management Science and Financial Engineering Vol.11 No.3

The aim of this paper is to identify the barriers to the B2B e-commerce development in Chinas pharmaceutical industry and to devise an effective strategy for its future development. Built on a detailed investigation of the market structure and recent development of electronic commerce in Chinas pharmaceutical industry, this paper proposes that the key issue in the development of effective B2B e-commerce business models is the successful transformation of the inter-organizational information systems into electronic marketplaces. In order to ensure the success of such electronic marketplaces, a government driven approach will be needed. In the process, designing an incentive compatible mechanism of coordinating the interest of all the market players will be the prerequisite.

Distribution of Phytic Acid and Associated Catabolic Enzymes in Soybean Sprouts and Indoleacetic Acid Promotion of Zn, Fe, and Ca Bioavailability

Xinkun Wang,Runqiang Yang,Xiaolin Jin,Yulin Zhou,Yongbin Han,Zhenxin Gu 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.6

Phytic acid is involved in storage of phosphorus and minerals in soybeans. The effects of 6 basic plant hormones on phytic acid degradation were investigated. After 6 days of germination, phytic acid contents in soybean sprouts decreased by 70%, compared with day 0 soybeans. Zn and Fe bioavailability of 6-day-old germinating soybean both significantly increased (p<0.05), by contrast, Ca bioavailability decreased compared with controls. Phytic acid was detectable only in cotyledons of soybean sprouts during germination. In germinating soybeans, 39.19-45.85% and 54.15-60.81% of phytase existed in embryos and cotyledons, respectively. Unlike phytase, acid phosphatase was present mainly in cotyledons (92.57-97.51%). Among the 6 hormones, 50 mg/L indoleacetic acid (IAA) brought the highest degradation value to phytic acid content, meanwhile, Zn, Fe, and Ca bioavailability of IAA-treated soybeans were significantly (p<0.05) improved, compared with that of the control, respectively.

Plasmonic Periodic Nanodot Arrays <i>via</i> Laser Interference Lithography for Organic Photovoltaic Cells with >10% Efficiency

Oh, Yulin,Lim, Ju Won,Kim, Jae Geun,Wang, Huan,Kang, Byung-Hyun,Park, Young Wook,Kim, Heejun,Jang, Yu Jin,Kim, Jihyeon,Kim, Dong Ha,Ju, Byeong-Kwon American Chemical Society 2016 ACS NANO Vol.10 No.11

<P>In this study, we demonstrate a viable and promising optical engineering technique enabling the development of high-performance plasmonic organic photovoltaic devices. Laser interference lithography was explored to fabricate metal nanodot (MND) arrays with elaborately controlled dot size as well as periodicity, allowing spectral overlap between the absorption range of the active layers and the surface plasmon band of MND arrays. MND arrays with,-,91 nm dot size and similar to 202 nm periodicity embedded in a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) hole transport layer remarkably enhanced the average power conversion efficiency (PCE) from 7.52% up 10.11%, representing one the highest PCE and degree of enhancement (similar to 34.4%) levels compared to the pristine device among plasmonic organic photovoltaics reported to date. The plasmonic enhancement mechanism was investigated by both optical and electrical analyses using finite difference time domain simulation and conductive atomic force microscopy studies.</P>

Effect of Germination and Incubation on Zn, Fe, and Ca Bioavailability Values of Soybeans (Glycine max L.) and Mung Beans (Vigna radiate L.)

Xinkun Wang,Runqiang Yang,Xiaolin Jin,Zhijie Chen,Yulin Zhou,Zhenxin Gu 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.5

Phytase/phosphatase activities, the phytic acid content, and Zn, Fe, and Ca bioavailability values of 4-d-germinated soybeans and mung beans were investigated. Phytase and phosphatase activities of germinated soybeans and mung beans both increased, compared with raw beans. The phytic acid contents declined in germinated soybeans by 57.5% and in mung beans by 76.0%. Zn and Fe bioavailability values increased in germinated beans and Ca bioavailability decreased. For incubation, the highest bioavailability values of Zn, Fe, and Ca, respectively, were achieved using an exogenous phytase treatment in mung beans (47.6, 44.6, and 51.5%). Soybeans exhibited values of 64.7, 60.6, and 47.9%, respectively, after a combined treatment with endogenous and exogenous phytases. Germination improves Zn and Fe bioavailability values of beans by increasing enzyme activity, but is time-consuming. Incubation is more efficient for improvement of Zn, Fe, and Ca bioavailability values in a short period of time.

A new thinning-based INAR(1) process for underdispersed or overdispersed counts

Kang Yao,Wang Dehui,Yang Kai,Zhang Yulin 한국통계학회 2020 Journal of the Korean Statistical Society Vol.49 No.2

Underdispersed and overdispersed phenomena are often observed in practice. To deal with these phenomena, we introduce a new thinning-based integer-valued autoregressive process. Some probabilistic and statistical properties of the process are obtained. The asymptotic normality of the estimators of the model parameters, using conditional least squares, weighted conditional least squares and modified quasi-likelihood methods, are presented. One overdispersed real-data example and one underdispersed real-data example are given to show the flexibility and superiority of the new model.

Digitally Current Controlled DC-DC Switching Converters Using an Adjacent Cycle Sampling Strategy

Tingcun Wei,Yulin Wang,Feng Li,Nan Chen,Jia Wang 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.1

A novel digital current control strategy for digitally controlled DC-DC switching converters, referred to as Adjacent Cycle Sampling (ACS), is proposed in this paper. For the ACS current control strategy, the available time interval from sampling the current to updating the duty ratio, is approximately one switching cycle. In addition, it is independent of the duty ratio. As a result, the contradiction between the processing speed of the hardware and the transient response speed can be effectively relaxed by using the ACS current control strategy. For digitally controlled buck DC-DC switching converters with trailing-edge modulation, digital current control algorithms with the ACS control strategy are derived for three different control objectives. These objectives are the valley, average, and peak inductor currents. In addition, the sub-harmonic oscillations of the above current control algorithms are analyzed and eliminated by using the digital slope compensation (DSC) method. Experimental results based on a FPGA are given, which verify the theoretical analysis results very well. It can be concluded that the ACS control has a faster transient response speed than the time delay control, and that its requirements for hardware processing speed can be reduced when compared with the deadbeat control. Therefore, it promises to be one of the key technologies for high-frequency DC-DC switching converters.

The combination of deoxynivalenol and zearalenone at permitted feed concentrations causes serious physiological effects in young pigs

Feng Chen,Yulin Ma,Chunyi Xue,Jingyun Ma,Qingmei Xie,Genhu Wang,Yingzuo Bi,Yongchang Cao 대한수의학회 2008 Journal of Veterinary Science Vol.9 No.1

This study was to investigate the effects of the combination of deoxynivalenol (DON) and zearalenone (ZON) on pigs. Twenty-four weaning piglets were divided into a control group fed a diet free of mycotoxins and a toxin group fed a diet containing 1 mg/kg DON and 250 μg/kg ZON. The results showed that supplementation of DON and ZON in diets had extensive effects on pigs. More specifically, DON and ZON caused levels of total protein, albumin, and globulin in sera to decrease (p < 0.05) by 14.5%, 6.5% and 11.3%, respectively, and at the same time increased (p < 0.05) the serum enzyme activities of γ-glutamyltransferase, aspartate aminotransferase and alanine aminotransferase by 72.0%, 32.6% and 36.6%, respectively. In addition, DON and ZON decreased (p < 0.05) the level of anticlassical swine fever antibody titers by 14.8%. Real-time PCR showed that DON and ZON caused the mRNA expression levels of IFN-γ, TNF-α, IL-2, to decrease (p < 0.05) by 36.0%, 29.0% and 35.4%, respectively. Histopathological studies demonstrated that DON and ZON caused abnormalities in the liver, spleen, lymph nodes, uterus, and kidney. The concentrations of DON and ZON used in this study are in line with the published critical values permitted by BML. Our study clearly put the standard and adequacy of safety measures for these toxins into question. The authors suggest that with the increasing availability of cellular and molecular technologies, it is time to revisit the safety standards for toxins in feeds so as to make feeds safer, providing consumers with safer products. This study was to investigate the effects of the combination of deoxynivalenol (DON) and zearalenone (ZON) on pigs. Twenty-four weaning piglets were divided into a control group fed a diet free of mycotoxins and a toxin group fed a diet containing 1 mg/kg DON and 250 μg/kg ZON. The results showed that supplementation of DON and ZON in diets had extensive effects on pigs. More specifically, DON and ZON caused levels of total protein, albumin, and globulin in sera to decrease (p < 0.05) by 14.5%, 6.5% and 11.3%, respectively, and at the same time increased (p < 0.05) the serum enzyme activities of γ-glutamyltransferase, aspartate aminotransferase and alanine aminotransferase by 72.0%, 32.6% and 36.6%, respectively. In addition, DON and ZON decreased (p < 0.05) the level of anticlassical swine fever antibody titers by 14.8%. Real-time PCR showed that DON and ZON caused the mRNA expression levels of IFN-γ, TNF-α, IL-2, to decrease (p < 0.05) by 36.0%, 29.0% and 35.4%, respectively. Histopathological studies demonstrated that DON and ZON caused abnormalities in the liver, spleen, lymph nodes, uterus, and kidney. The concentrations of DON and ZON used in this study are in line with the published critical values permitted by BML. Our study clearly put the standard and adequacy of safety measures for these toxins into question. The authors suggest that with the increasing availability of cellular and molecular technologies, it is time to revisit the safety standards for toxins in feeds so as to make feeds safer, providing consumers with safer products.