Design of Abnormal Data Analysis and Processing System Based on RFID Supply Chain

Chunfeng Wang,Shuiming Zhong,Jin Wang 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.11

With the deep application of RFID, the deployment of the RFID system is gradually to have the large-scale, networked, distributed development trend. The previous abnormal data analysis and processing way can not meet with the need of data processing. According to the survey of international famous consulting company (Gartner) for the "information overload", results show that more than 90% of the enterprises think the enterprise competitiveness is closely related to its information capacity. In order to obtain the useful information, we must analyze, process the data, and exclude "exception" data. So, it is very important to realize the detection of abnormal data. This paper presents the RFID supply an abnormal data analysis and processing system of RFID supply chain based on distance, rules and middleware technology .This system is divided into three levels: data processing layer, anomaly analysis lay and graphical display layer. Finally, through the performance analysis of the system, the effectiveness of the system has been verified.

Exploring the role and mechanisms of diallyl trisulfide and diallyl disulfide in chronic constriction-induced neuropathic pain in rats

( Gang Wang ),( Yan Yang ),( Chunfeng Wang ),( Jianzhong Huang ),( Xiao Wang ),( Ying Liu ),( Hao Wang ) 대한통증학회 2020 The Korean Journal of Pain Vol.33 No.3

Background: Garlic oil is a rich source of organosulfur compounds including diallyl disulfide and diallyl trisulfide. There have been studies showing the neuroprotective actions of these organosulfur compounds. However, the potential of these organosulfur compounds in neuropathic pain has not been explored. The present study was aimed at investigating the pain attenuating potential of diallyl disulfide and diallyl trisulfide in chronic constriction injury (CCI)-induced neuropathic pain in rats. The study also explored their pain-attenuating mechanisms through modulation of H₂S, brain-derived neurotrophin factor (BDNF) and nuclear factor erythroid 2-related factor 2 (Nrf2). Methods: The rats were subjected to CCI injury by ligating the sciatic nerve in four places. The development of neuropathic pain was measured by assessing mechanical hyperalgesia (Randall-Selittotest), mechanical allodynia (Von Frey test), and cold allodynia (acetone drop test) on 14th day after surgery. Results: Administration of diallyl disulfide (25 and 50 mg/kg) and diallyl trisulfide (20 and 40 mg/kg) for 14 days led to a significant reduction in pain in CCI-subjected rats. Moreover, treatment with these organosulfur compounds led to the restoration of H₂S, BDNF and Nrf2 levels in the sciatic nerve and dorsal root ganglia. Coadministration of ANA-12 (BDNF blocker) abolished pain attenuating actions as well as BDNF and the Nrf2 restorative actions of diallyl disulfide and diallyl trisulfide, without modulating H₂S levels. Conclusions: Diallyl disulfide and diallyl trisulfide have the potential to attenuate neuropathic pain in CCI-subjected rats possibly through activation of H₂S-BDNF-Nrf2 signaling pathway.

A study on tensile strength mechanism of hypoeutectic gray cast iron reinforced by composite silicon carbide powder

Chunfeng Wang,Jun Yang,Guilin Liu,Hong Gao,Meiling Chen 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.4

This study aims to reveal the changes in the microstructure of hypoeutectic gray cast iron under the addition of compositesilicon carbide powder of different mass fractions, and to explore how modified silicon carbide (SiC) particles of different sizesand contents improve the mechanical properties of hypoeutectic gray cast iron. The results showed that the modified SiCparticles increased the nucleation, the undercooling and microstructure of hypoeutectic gray cast iron, and the tensile strengthof the iron at room temperature was increased by 18,28%. The present work solves the problem that traditional SiC ceramicparticles are prone to agglomeration in molten metal, analyzes its action mechanism, and can expand the application of SiCceramic particles to strengthening metal properties of casting materials.

Big data platform for health monitoring systems of multiple bridges

Wang, Manya,Ding, Youliang,Wan, Chunfeng,Zhao, Hanwei Techno-Press 2020 Structural monitoring and maintenance Vol.7 No.4

At present, many machine leaning and data mining methods are used for analyzing and predicting structural response characteristics. However, the platform that combines big data analysis methods with online and offline analysis modules has not been used in actual projects. This work is dedicated to developing a multifunctional Hadoop-Spark big data platform for bridges to monitor and evaluate the serviceability based on structural health monitoring system. It realizes rapid processing, analysis and storage of collected health monitoring data. The platform contains offline computing and online analysis modules, using Hadoop-Spark environment. Hadoop provides the overall framework and storage subsystem for big data platform, while Spark is used for online computing. Finally, the big data Hadoop-Spark platform computational performance is verified through several actual analysis tasks. Experiments show the Hadoop-Spark big data platform has good fault tolerance, scalability and online analysis performance. It can meet the daily analysis requirements of 5s/time for one bridge and 40s/time for 100 bridges.

Ion Temperature and Radial Profile of CII-CV located in the Edge and Divertor Plasmas of Large Helical Device

Tetsutarou Oishi,Shigeru Morita,Chunfeng Dong,Motoshi Goto,Erhui Wang,Xianli Huang 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.6

Space-resolved vacuum ultraviolet (VUV) spectroscopy using a 3-m normal incidence spectrometeris utilized to measure the impurity emission profile in the edge and divertor plasmas of theLarge Helical Device (LHD). It measures the vertical profile of VUV lines emitted in the wavelengthrange of 300 − 3200 °A. CII, CIII, CIV, and CV lines emitted from carbon ions are successfully measured,and their ion temperatures are derived from the Doppler broadening. Vertical profiles ofthe emission intensity and the ion temperature are measured simultaneously for the CIV line. Theemission intensity profile, which has several peak structures, is reasonably explained by consideringthe relation between the C3+ ion distribution and the geometry used for the observations.

Reducing the efficiency droop by lateral carrier confinement in InGaN/GaN quantum-well nanorods.

Shi, Chentian,Zhang, Chunfeng,Yang, Fan,Park, Min Joo,Kwak, Joon Seop,Jung, Sukkoo,Choi, Yoon-Ho,Wang, Xiaoyong,Xiao, Min Optical Society of America 2014 Optics express Vol.22 No.suppl3

<P>Efficiency droop is a major obstacle facing high-power application of InGaN/GaN quantum-well (QW) light-emitting diodes (LEDs). In this paper, we report the suppression of efficiency droop induced by the process of density-activated defect recombination in nanorod structures of a-plane InGaN/GaN QWs. In the high carrier density regime, the retained emission efficiency in a dry-etched nanorod sample is observed to be over two times higher than that in its parent QW sample. We further argue that such improvement is a net effect that the lateral carrier confinement overcomes the increased surface trapping introduced during fabrication.</P>

The Impact of Carrier Transport Confinement on the Energy Transfer Between InGaN/GaN Quantum‐Well Nanorods and Colloidal Nanocrystals

Jiang, Bin,Zhang, Chunfeng,Wang, Xiaoyong,Park, Min Joo,Kwak, Joon Seop,Xu, Jian,Zhang, Huichao,Zhang, Jiayu,Xue, Fei,Xiao, Min WILEY‐VCH Verlag 2012 Advanced Functional Materials Vol.22 No.15

<P><B>Abstract</B></P><P>The energy transfer (ET) between InGaN/GaN multiple‐quantum‐well (MQW) nanorods (NRs) and semiconductor nanocrystals (NCs) for efficient color conversion is studied. An exceptional contribution of carrier transport confinement to the ET mechanisms is observed in the proximal side‐wall coupling system, which consists of InGaN/GaN NRs and CdSe NCs. Under relatively low or high excitation, the ET rate shows different carrier‐density dependence, resulting from different electron‐hole configurations, i.e., bound excitons and free carriers. In the localized exciton regime, the ET rate decreases when increasing temperature from 20 K to 200 K. However, in the free‐carrier regime, the ET rate varies insignificantly in the same temperature range. The temperature dependence in this NR‐NC coupling system is different from that in the previously studied planar MQW‐NC coupling system. It is suggested that the carrier transport confinement in NRs is a major factor for these divergences. The highly efficient ET with efficiency up to 80% shows a promising potential of using such NR‐NC coupled structures for ET‐pumped, NC‐based, light‐emitting devices.</P>

Effect of convex surface splicing characteristics of mold on the machining error in milling process

Dongkai Jia,Shi Wu,Chunfeng Wang,Xian-li Liu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1

Most of the molds of automobile panels are spliced with insert-type modules. Sudden variations in load and impact vibration can occur while processing splicing area, which affects the overall quality of this area. In this study, to improve the machining accuracy of the convex-surface splicing area, the influence of thermal deformation of tool, residual height, and impact vibrations on the machining error of this area is firstly analyzed. Subsequently, based on the motion path of the cutting edge of ball-end mill, a comprehensive error model for mill machine is established, which accounts for the tool error, residual height, and milling vibration. Finally, based on the milling experiment of convex-surface splicing die, the variation trend of machining error with machining inclination, spindle speed, and cutting depth is examined to verify comprehensive error algorithm MATLAB simulation results. The experimental results show that the prediction error of the proposed error model is between 4-8 % when the machining inclination is positive, and it is between 18-21 % when the machining inclination is negative, indicating that the proposed model is consistent with the experimental data. Novelty aspects, the present work: (i) proposes a mechanistic modeling approach to predicting machining error considering of thermal deformation, residual height, and impact vibrations for splicing mold; (ii) demonstrates that thermal deformation, residual height, and impact vibrations need to be taken into account for modeling the comprehensive machining error of splicing mold; (iii) contributes to practical industrial application of finishing machining technology of mold and die with splicing characteristics.

Effects of reduced exciton diffusion in InGaN/GaN multiple quantum well nanorods.

Jiang, Bin,Zhang, Chunfeng,Wang, Xiaoyong,Xue, Fei,Park, Min Joo,Kwak, Joon Seop,Xiao, Min Optical Society of America 2012 Optics express Vol.20 No.12

<P>We investigate the effects of reduced exciton diffusion on the emission properties in InGaN/GaN multiple-quantum-well nanorods. Time-resolved photoluminescence spectra are recorded and compared in dry-etched InGaN/GaN nanorods and parent multiple quantum wells at various temperatures with carrier density in different regimes. Faster carrier recombination and absence of delayed rise in the emission dynamics are found in nanorods. Many effects, including surface damages and partial relaxation of the strain, may cause the faster recombination in nanorods. Together with these enhanced carrier recombination processes, the reduced exciton diffusion may induce the different temperature-dependent emission dynamics characterized by the delayed rise in time-resolved photoluminescence spectra.</P>

Nonradiative energy transfer between colloidal quantum dot-phosphors and nanopillar nitride LEDs.

Zhang, Fan,Liu, Jie,You, Guanjun,Zhang, Chunfeng,Mohney, Suzanne E,Park, Min Joo,Kwak, Joon Seop,Wang, Yongqiang,Koleske, Daniel D,Xu, Jian Optical Society of America 2012 Optics express Vol.20 No.2

<P>We present in this communication our study of the nonradiative energy transfer between colloidal quantum dot (QD) phosphors and nitride nanopillar light emitting diodes (LEDs). An epitaxial p-i-n InGaN/GaN multiple quantum-well (QW) heterostructure was patterned and dry-etched to form dense arrays of nanopillars using a novel etch mask consisting of self-assembled In3Sn clusters. Colloidal QD phosphors have been deposited into the gaps between the nanopillars, leading to sidewall coupling between the QDs and InGaN QW emitters. In this approach, close QW-QD contact and a low-resistance design of the LED contact layer were achieved simultaneously. Strong non-radiative energy transfer was observed from the InGaN QW to the colloidal QD phosphors, which led to a 263% enhancement in effective internal quantum efficiency for the QDs incorporated in the nanopillar LEDs, as compared to those deposited over planar LED structures. Time-resolved photoluminescence was used to characterize the energy transfer process between the QW and QDs. The measured rate of non-radiative QD-QW energy-transfer agrees well with the value calculated from the quantum efficiency data for the QDs in the nanopillar LED.</P>