An Improved BER-Optimal Relay Selection Scheme for Decode-and-Forward Cooperative Networks

Yuhui Han,Mingji Yang,Aili Wang 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.1

We are concerned with the relay selection in a decode-and-forward cooperative network to minimize the bit error rate (BER) in a radio cell. This problem can be solved using maximum weighted (MW) matching algorithm, greedy matching algorithm or worst-link-first (WLF) matching algorithm. Among the algorithms, WLF matching algorithm has achieved much attention for its being less complex while the achieved performance is high. In order to further reduce the computational complexity, we propose an improved WLF relay selection scheme, in which relays are selected according to instantaneous channel state information (CSI) and a cooperative threshold is set up to eliminate some unsatisfying candidate relays from the set of alternative candidate relays and thus reduce the amount of calculation. Theory analysis and simulation results both show that the improved WLF relay selection scheme proposed can be easily implemented and achieve almost the same BER performance as that of WLF scheme while the computational complexity is much lower.

Fe(II)-Anchored Cotton Fabric for Heterogeneous Fenton Degradation of Rhodamine B Dye

Yuhui Yang,Hongbin Chen,Ruquan Zhang,Jingjing Huang,Zhikui Bai,Shili Xiao 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10

The ferric ions sludge produced during pollutants degradation was an obstacle for large scale application of Fentonoxidation technology. Herein, we reported a facile method using 2,2,6,6-tetramethylpiperidine-1-oxygen radical (TEMPO)-oxidized cotton fabric as a substrate for anchoring Fe(II) ions to produce Fe(II)-anchored cotton fabric. The formation ofFe(II)-anchored cotton fabric was confirmed using EDS analysis and FTIR measurement. Bath experiments indicated thatFe(II)-anchored cotton fabric could Fenton oxidize rhodamine B (RhB) dye in a high efficient rate (95.9 %) within 60 minwithout second pollution. Fe(II)-anchored cotton could be reused without any physical/chemical treatment and itsdecolorization efficiency was retained at 89.9 % even after the third cycle. Moreover, the decolorization behavior of Fe(II)-anchored cotton fabric for the RhB solution was affected by H2O2 dosage, Fe(II) ion content, and inorganic salts. Kineticstudy indicated that the RhB decolorization process fits a pseudo-first order well and the sorption isotherm assessmentrevealed that the reactive sorption of RhB dye on Fe(II)-anchored cotton fabric fits the Freundlich model.

A Survey on Clustering based Meteorological Data Mining

Wei Tian,Yuhui Zheng,Runzhi Yang,Sai Ji,Jin Wang 보안공학연구지원센터 2014 International Journal of Grid and Distributed Comp Vol.7 No.6

Data mining is an important tool in meteorological problems solved. Cluster analysis techniques in data mining play an important role in the study of meteorological applications. The research progress of the clustering algorithms in meteorology in recent years is summarized in this paper. First, we give a brief introduction of the principles and characteristics of the clustering algorithms that are commonly used in meteorology. On the other hand, the applications of clustering algorithms in meteorology are analyzed, and the relationship between the various clustering algorithms and meteorological applications are summarized. Then we interpret the relationship from the perspectives of algorithms’ characteristics and practical applications. Finally, some main research issues and directions of the clustering algorithms in meteorological applications are pointed out.

Simulation Research of Multi-morphological Microstructures Chaining Mechanism of Nano-magnetic Fluid

Lei Yang,Yibiao Chen,Yao Yao,Shuaikang Wei,Yuhui Xie,Decai Li,Jun Yu,Hongming Zhou,Yiping Feng 한국자기학회 2024 Journal of Magnetics Vol.29 No.1

For nano-magnetic fluid(NMF), the magnetic nano-particle(MNP) kinematic behavior in a magnetic field and the chain-like microstructure evolution are important to study the NMF properties at the microscopic level. However, the chain structure formation mechanism and the effects of multiple environmental factors on microstructural morphology remain unclear. In this paper, the interaction of a two-particle system, chain structure formation process, microstructure evolution and response time simulation of NMF is investigated by the discrete element simulation method. The results show that the magnetic dipole and repulsive forces dominate the chain structure formation and evolution under a uniform magnetic field. MNPs assemble into chain-like structures and various complex structures along the magnetic f ield direction. The volume fraction, magnetization intensity and particle size significantly affect the microstructure and the response time. The above study can obtain the specific morphology of the microstructure at different working conditions and broaden the application of NMF in practical engineering.

Analysis of the Bacterial Community in a Full-scale Printing and Dyeing Wastewater Treatment System Based on T-RFLP and 454 Pyrosequencing

Qingxiang Yang,Jia Wang,Xinkuan Han,Yuanyuan Xu,Dong Liu,Hongxin Hao,Xuemei L,Yuhui Guo,Tianqi Niu,Shiyue Qi 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.1

In this study, the bacterial dynamics andstructure compositions in the two-stage biological processof a full-scale printing and dyeing wastewater (PDW)treatment system were traced and analyzed by terminalrestriction fragment length polymorphism (T-RFLP) and454 pyrosequencing techniques. T-RFLP analysis showedthat the microbial communities experienced significantvariation in the process of seed sludge adaptation to thePDW environments and were in constant evolution duringthe whole running period of the system, despite theconstant COD and color removal effects. Pyrosequencingresults indicated that the two-stage biological systemharbored rather diverse bacteria, with Proteobacteria beingthe predominant phylum during the steady running period,although its microbial compositions differed. The firststageaerobic tank was dominated by α-Proteobacteria(89.05% of Proteobacteria), whereas in the second-stageaerobic tank, β- and γ-Proteobacteria, besides α-Proteobacteria,were the dominant bacterial populations.

Substitution of soybean meal with detoxified Jatropha curcas kernel meal: Effects on performance, nutrient utilization, and meat edibility of growing pigs

Li, Yang,Chen, Ling,Zhang, Yuhui,Wu, Jianmei,Lin, Yan,Fang, Zhengfeng,Che, Lianqiang,Xu, Shengyu,Wu, De Asian Australasian Association of Animal Productio 2018 Animal Bioscience Vol.31 No.6

Objective: The study was conducted to investigate the effects of replacing soybean meal (SBM) with different levels of detoxified Jatropha curcas kernel meal (DJM) in growing pig diets on growth performance, nutrients digestibility and meat edibility. Methods: A total of 144 pigs with initial body weight of $20.47{\pm}1.44kg$, were randomly allocated to 6 dietary treatments with 6 replications per treatment and 4 pigs per replication for a period of 79 days. Six diets (DJM0, DJM15, DJM30, DJM45, DJM60, and DJM75) were formulated using DJM to replace 0%, 15%, 30%, 45%, 60%, and 75% of SBM. From d 37 to 42, feces and urine were total collected from six barrows in each treatment. At day 79, thirty-six pigs were slaughtered for sampling. The feed intake and weight gain were recorded, while the intestinal morphology, digestive enzyme activities, nutrient digestibility and the content of residual phorbol esters in muscles were determined. Results: The results showed that increasing the replacement of SBM with DJM decreased the parameters including body weight, average daily gain, average daily feed intake, gain-to-feed ratio, weight and villus heights of duodenum, villus height and villus height/crypt depth of jejunum, digestive enzymes (protease, amylase, lipase, and trypsin) activities, and nutrients digestibility (nitrogen deposition, digestibility of nitrogen, energy digestibility, and total nitrogen utilization) (linear, p<0.05; quadratic, p<0.05) and there was no significant difference among DJM0, DJM15, and DJM30 in all measured indices. The highest diarrhea morbidity was observed in DJM75 (p<0.05). Phorbol esters were not detected in pig muscle tissues. Conclusion: The DJM was a good protein source for pigs, and could be used to replace SBM up to 30% (diet phorbol esters concentration at 5.5 mg/kg) in growing pig diets with no detrimental impacts on growth performance, nutrient utilization, and meat edibility.

Vision-based full-field panorama generation by UAV using GPS data and feature points filtering

Yapeng Guo,Yang Xu,Haowei Niu,Zhonglong Li,Yuhui E.,Xinghua Jiao,Shunlong Li 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.25 No.5

To meet the urgent requirements of safety surveillance from civil engineering management authorities, this study proposes a refined and efficient approach to generate full-field high-resolution panorama of construction sites using cameraamounted UAV (Unmanned Aerial Vehicle). GPS (Global Position System) information extraction for pre-registration, feature points filtering for efficient registration and optimal seaming line seeking for fusion are performed in sequence to form the full-field panorama generation framework. Advantages of the proposed method are as follows. First, GPS information can sort images for pre-registration, avoiding inefficient repeated pairwise calculations and matching. Second, the feature points are filtered according to the characteristics of the construction site images to reduce the amount of calculation. The proposed framework is validated on a road construction site and results demonstrate that it can generate an accurate and high-quality full-site panorama for the safety supervision in a much efficient manner.

Impact of sugarcane bagasse-derived biochar on heavy metal availability and microbial activity: A field study

Nie, Chengrong,Yang, Xing,Niazi, Nabeel Khan,Xu, Xiaoya,Wen, Yuhui,Rinklebe, Jö,rg,Ok, Yong Sik,Xu, Song,Wang, Hailong Elsevier 2018 CHEMOSPHERE - Vol.200 No.-

<P><B>Abstract</B></P> <P>In the current study, we conducted a field experiment using the test plant, <I>Brassica chinesis</I> L. (pak choi), to investigate the effect of sugarcane bagasse-derived biochar on the bioavailability of cadmium (Cd), copper (Cu) and lead (Pb), and the health of soil microbiota in a contaminated soil. Biochar application significantly (<I>P</I> < 0.05) increased pak choi yield. Bioavailability of heavy metals to plant shoots and roots decreased with increasing biochar application rates (at 0, 1.5, 2.25 and 3.0 t ha<SUP>−1</SUP>). Sequential extraction of the biochar-treated and -untreated soil revealed that exchangeable Cd reduced whereas organically-bound fraction increased with increasing biochar rate. The labile fractions of Cu and Pb decreased, but the residual fraction increased in biochar-treated soils compared to the control. Urease, catalase and invertase activities, and the populations of bacteria and actinomycetes were significantly enhanced, whereas fungi population declined in biochar-treated soils. This study highlights that sugarcane bagasse biochar has the potential to support the remediation of soils contaminated with heavy metals, and as such can improve the yield and quality of agricultural crops.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sugarcane bagasse biochar amendment reduced availability of Cd, Cu and Pb in soils. </LI> <LI> Heavy metals were less labile in the biochar-treated soils. </LI> <LI> Biochar amendment induced an increase in soil enzyme and microbial activity. </LI> <LI> Edible part of pak choi was safer for human consumption after biochar amendment. </LI> </UL> </P>

An Energy-Efficient Multi-hop Hierarchical Routing Protocol for Wireless Sensor Networks

Jin Wang,Xiaoqin Yang,Yuhui Zheng,Jianwei Zhang,Jeong-Uk Kim 보안공학연구지원센터 2012 International Journal of Future Generation Communi Vol.5 No.4

Development and certification of bifenazate diazene reference material using mass balance method

Young Hoon Kim,YuHui Son,Chan-yang Lee,Jeong Ju Moon,Uijeong Park,Heesun Yu,Jae-hyuk Han,Hongjun Jang,Hyoungsu Kim,Dongjoo Lee,Seung-Hoon Baek 한국분석과학회 2021 학술대회논문집 Vol.2021 No.11

Bifenazate diazene (BD) is a environmental metabolite of bifenazate a selective carbazate acaricide. The residual levels of bifenazate and BD is regulated in food stuffs. In this study, we aimed to develop a certified reference material (CRM) of BD for efficient and reliable testing. BD was synthesized from bifenazate through the catalytic aerobic oxidation. Organic impurity was determined using HPLC-UV assay. Inorganic impurity was determined using loss on ignition. The content of water and residual solvent were determined using Karl fisher coulometric titration and residual solvent assay, respectively. Calculated purity of candidate CRM was 99.67%, and expanded uncertainty was 0.03% at 95% confidence levels. Homogeneity and stability test will be further carried out to ensure the reliability of CRM. The estabilished CRM will be useful to determine the BD residue levels in food.