Constrained Relay Node Deployment using an improved multi-objective Artificial Bee Colony in Wireless Sensor Networks

( Wenjie Yu ),( Xunbo Li ),( Xiang Li ),( Zhi Zeng ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.6

Wireless sensor networks (WSNs) have attracted lots of attention in recent years due to their potential for various applications. In this paper, we seek how to efficiently deploy relay nodes into traditional static WSNs with constrained locations, aiming to satisfy specific requirements of the industry, such as average energy consumption and average network reliability. This constrained relay node deployment problem (CRNDP) is known as NP-hard optimization problem in the literature. We consider addressing this multi-objective (MO) optimization problem with an improved Artificial Bee Colony (ABC) algorithm with a linear local search (MOABCLLS), which is an extension of an improved ABC and applies two strategies of MO optimization. In order to verify the effectiveness of the MOABCLLS, two versions of MO ABC, two additional standard genetic algorithms, NSGA-II and SPEA2, and two different MO trajectory algorithms are included for comparison. We employ these metaheuristics on a test data set obtained from the literature. For an in-depth analysis of the behavior of the MOABCLLS compared to traditional methodologies, a statistical procedure is utilized to analyze the results. After studying the results, it is concluded that constrained relay node deployment using the MOABCLLS outperforms the performance of the other algorithms, based on two MO quality metrics: hypervolume and coverage of two sets.

Facile synthesis of Nafion-supported Pt nanoparticles with ultra-low loading as a high-performance electrocatalyst for hydrogen evolution reaction

Yu, Jianguo,Wei, Dan,Zheng, Zhe,Yu, Wenjie,Shen, Honghui,Qu, Yuning,Wen, Shuya,Kwon, Young-Uk,Zhao, Yongnan Elsevier 2020 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.566 No.-

<P><B>Abstract</B></P> <P>x%Pt-Naf-CV (Pt-Nafion-Cyclic Voltammetry) catalysts with homogeneously distributed platinum nanoparticles and ultra-low Pt loading are successfully synthesized by using a facile potential cycling approach. The as-synthesized 0.8%Pt-Naf-CV catalyst exhibits an enhanced electrocatalytic activity for hydrogen evolution reaction (HER) in 0.5 M H<SUB>2</SUB>SO<SUB>4</SUB> solution, which obtains a low overpotential of 34 mV at 10 mA cm<SUP>−2</SUP>. The linear sweep voltammetry (LSV) curve of 0.8%Pt-Naf-CV catalyst is almost consistent with that of commercial Pt/C. However, the 0.8%Pt-Naf-CV catalyst displays a more excellent stability and durability in comparison with commercial Pt/C. Besides, the Pt loading of Pt/C (Pt–10 wt%) is about 10 times that of 0.8%Pt-Naf-CV catalyst. The improved electrocatalytic performances are derived from the synergistic effects of Pt and Nafion. The Nafion plays a significant role as a dispersant, carrier and structure directing agent on the morphology and size of the Pt catalyst. This result contributes a promising method to enhance the catalytic activity and reduce the amount of Pt.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Bacterial Community Structure and Function Shift in Rhizosphere Soil of Tobacco Plants Infected by Meloidogyne incognita

Wenjie Tong(Wenjie Tong),Junying Li(Junying Li),Wenfeng Cong(Wenfeng Cong),Cuiping Zhang(Cuiping Zhang),Zhaoli Xu(Zhaoli Xu),Xiaolong Chen(Xiaolong Chen),Min Yang(Min Yang),Jiani Liu(Jiani Liu),Lei Yu 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.6

Root-knot nematode disease is a widespread and catastrophic disease of tobacco. However, little is known about the relationship between rhizosphere bacterial community and root-knot nematode disease. This study used 16S rRNA gene sequencing and PICRUSt to assess bacterial community structure and function changes in rhizosphere soil from Meloidogyne incognita-infected tobacco plants. We studied the rhizosphere bacterial community structure of M. incognita-infected and uninfected tobacco plants through a paired comparison design in two regions of tobacco planting area, Yuxi and Jiuxiang of Yunnan Province, southwest China. According to the findings, M. incognita infection can alter the bacterial population in the soil. Uninfested soil has more operational taxonomic unit numbers and richness than infested soil. Principal Coordinate Analysis revealed clear separations between bacterial communities from infested and uninfested soil, indicating that different infection conditions resulted in significantly different bacterial community structures in soils. Firmicutes was prevalent in infested soil, but Chloroflexi and Acidobacteria were prevalent in uninfested soil. Sphingomonas, Streptomyces, and Bradyrhizobium were the dominant bacteria genera, and their abundance were higher in infested soil. By PICRUSt analysis, some metabolism-related functions and signal transduction functions of the rhizosphere bacterial community in the M. incognita infection-tobacco plants had a higher relative abundance than those uninfected. As a result, rhizosphere soils from tobacco plants infected with M. incognita showed considerable bacterial community structure and function alterations.

MXene/PVA Fiber-based Supercapacitor with Stretchability for Wearable Energy Storage

Wenjie Yu,Yu Li,Binjie Xin,Zan Lu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11

MXene fiber-based supercapacitor exhibits a great potential for wearable energy storage devices with a largesurface area, good conductive, and higher power density. However, MXene flakes are difficult to spin independently due tothe non-liquid crystal structure. In the report, we fabricated freestanding MXene/PVA fibers with good stretchability andimpressive electrochemical properties for fiber-based supercapacitors by a simple wet spinning method. The tensile strengthof the MXene/PVA fibers is significantly enhanced compared with pure PVA fibers for the concentration of MXene foraround 5-20 wt.%. The elongation of the MXene/PVA fiber can reach 48 %, even if the MXene concentration increase to25 wt.%. MXene flakes also increase the thermal stability of hybrid fibers compared with pure PVA fibers. MXene/PVAfiber-based supercapacitors act as efficient energy storage devices, which display high gravimetric capacitance (119.3 F g-1),and areal capacitance (130.9 mF cm-2), strong durability in multiple mechanical states, and steady electrochemical behaviorafter stretching.

An electrode universal and self-healable integrated supercapacitor fabricated by physical adsorption based on mussel-inspired highly adhesive gel electrolyte

Gang Qin,Yue Wang,Wenjie He,Da Zhang,Xiaojuan Yu,Fenghan Gong,Hengyi Yu,Xiang Yu,Jia Yang,Qiang Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-

Integrated supercapacitor with stable electrochemical performance under complex deformations is theprospective energy storage device for wearable electronics. However, there is often a conflict betweenthe mechanical performance and the specific capacitance of the conventional conductive polymerbasedintegrated supercapacitor. In this work, a novel integrated supercapacitor based on adhesive gelelectrolyte has been prepared by physical adsorption, which not only avoids the drawbacks of the conventionalintegrated supercapacitor but also exhibits the electrode universality including powder electrodematerial. The adhesive triple network polyacrylamide/polydopamine/agar/H3PO4 gel electrolyteis fabricated with high ionic conductivity, toughness and adhesion. Based on this, the integrated supercapacitoris assembled by spraying activated carbon powder on both sides of the pre-stretched biaxiallygel electrolyte. Due to the strong interfacial adhesion, such a device exhibits low interfacial resistance andhigh specific capacitance of 155 mF/cm2 at 0.5 mA/cm2. More impressively, the capacitance retention canreach 92.4% after 10 cutting/healing cycles and even keep the brilliant self-healabillity at 20 C. Additionally, it can hold stable electrochemical performance when exposed to harsh environments. The physical adsorption strategy would offer novel inspiration for the development of integrated supercapacitorand has great practical applications in wearable and portable electronics.

Intelligent Operation Center for Hengqin New Area Smart Grid

Zheng, Wenjie,Chen, Hui,Li, Chuanjian,Yu, Nanhua,Chen, Jiongcong The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.3

This paper presents a framework of intelligent operation center (IOC)for Hengqin New Area smart grid demonstration project in terms of IT topology and system functionalities. The platform is developed based on Service Oriented Architechture(SOA) and the newly released enterprise standards of China Southern Grid (CSG).The system information covers transmission system, substation and distribution system on Hengqin Island by monitoring the status of various devices with cutting edge technologies as well as coordinating and merging different systems in a new platform which is expected to enable a more intelligent way for future operation and maintenance information exchange in between the systems currently used. In addition, it will not only enhance the system operational efficiency but also create a novel management experience for further promotion of IOC in the continuously deregulated market environment within service areas of CSG.

Chondrogenic Differentiation and Three Dimensional Chondrogenesis of Human Adipose-Derived Stem Cells Induced by Engineered Cartilage-Derived Conditional Media

Hengyun Sun,Yu Liu,Ting Jiang,Xia Liu,Aijuan He,Jie Li,Wenjie Zhang,Wei Liu,Yilin Cao,Guangdong Zhou 한국조직공학과 재생의학회 2014 조직공학과 재생의학 Vol.11 No.1

Due to lack of optimal inductive protocols, how to effectively improve chondrogenesis of adipose-derived stem cells (ASCs) is still a great challenge. Our previous studies demonstrated that the culture media derived from chondrocyte-scaffold constructs (conditional media) contained various soluble chondrogenic factors and were effective for directing chondrogenic differentiation of bone marrow stem cells. Nevertheless, it remains unclear whether the conditional media can induce ASCs towards chondrogenic differentiation, especially for three-dimensional (3D) cartilage formation in a preshaped scaffold. In this study, it demonstrated that the conditional media derived from chondrocyte-scaffold constructs could promote ASCs to differentiate into chondrocyte-like cells, with similar expression of type II collagen to those induced by chondrogenic growth factors. Moreover, the expression level of chondrocyte-specific genes, such as SOX9, type II collagen, and COMP, was even higher in conditional medium group (CM) than that in optimized chondrogenic growth factor group (GF), indicating that the conditional media can serve as an effective inducer for chondrogenic differentiation of ASCs. Most importantly, the conditional media could also induce ASC-scaffold constructs to form 3D cartilage-like tissue with typical lacunae structures and positive expression of cartilage specific matrices, even higher contents of GAG and type II collagen were achieved in CM group compared to GF group. The current study establishes a simple, but stable, efficient, and economical method for directing 3D cartilage formation of ASCs, a strategy that may be more closely applicable for repairing cartilage defects.

Single-cell RNA sequencing analysis of human bone-marrow-derived mesenchymal stem cells and functional subpopulation identification

Xie Zhongyu,Yu Wenhui,Ye Guiwen,Li Jinteng,Zheng Guan,Liu Wenjie,Lin Jiajie,Su Zepeng,Che Yunshu,Ye Feng,Zhang Zhaoqiang,Wang Peng,Wu Yanfeng,Shen Huiyong 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-

Mesenchymal stem cells (MSCs) are a common kind of multipotent cell in vivo, but their heterogeneity limits their further applications. To identify MSC subpopulations and clarify their relationships, we performed cell mapping of bone-marrow-derived MSCs through single-cell RNA (scRNA) sequencing. In our study, three main subpopulations, namely, the stemness subpopulation, functional subpopulation, and proliferative subpopulation, were identified using marker genes and further bioinformatic analyses. Developmental trajectory analysis showed that the stemness subpopulation was the root and then became either the functional subpopulation or the proliferative subpopulation. The functional subpopulation showed stronger immunoregulatory and osteogenic differentiation abilities but lower proliferation and adipogenic differentiation. MSCs at different passages or isolated from different donors exhibited distinct cell mapping profiles, which accounted for their corresponding different functions. This study provides new insight into the biological features and clinical use of MSCs at the single-cell level, which may contribute to expanding their application in the clinic.

ALKBH5 facilitates CYP1B1 mRNA degradation via m6A demethylation to alleviate MSC senescence and osteoarthritis progression

Ye Guiwen,Li Jinteng,Yu Wenhui,Xie Zhongyu,Zheng Guan,Liu Wenjie,Wang Shan,Cao Qian,Lin Jiajie,Su Zepeng,Li Dateng,Che Yunshu,Fan Shuai,Wang Peng,Wu Yanfeng,Shen Huiyong 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-

Improving health and delaying aging is the focus of medical research. Previous studies have shown that mesenchymal stem cell (MSC) senescence is closely related to organic aging and the development of aging-related diseases such as osteoarthritis (OA). m6A is a common RNA modification that plays an important role in regulating cell biological functions, and ALKBH5 is one of the key m6A demethylases. However, the role of m6A and ALKBH5 in MSC senescence is still unclear. Here, we found that the m6A level was enhanced and ALKBH5 expression was decreased in aging MSCs induced by multiple replications, H2O2 stimulation or UV irradiation. Downregulation of ALKBH5 expression facilitated MSC senescence by enhancing the stability of CYP1B1 mRNA and inducing mitochondrial dysfunction. In addition, IGF2BP1 was identified as the m6A reader restraining the degradation of m6A-modified CYP1B1 mRNA. Furthermore, Alkbh5 knockout in MSCs aggravated spontaneous OA in mice, and overexpression of Alkbh5 improved the efficacy of MSCs in OA. Overall, this study revealed a novel mechanism of m6A in MSC senescence and identified promising targets to protect against aging and OA.

Neutronic Study of Utilization of Discrete Thorium-Uranium Fuel Pins in CANDU-6 Reactor

Nianbiao Deng,Tao Yu,Jinsen Xie,Zhenping Chen,Qin Xie,Pengcheng Zhao,Zijing Liu,Wenjie Zeng 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.2

Targeting at simulating the application of thorium-uranium (TU) fuel in the CANDU-6 reactor, this paperanalyzes the process using the code DRAGON/DONJON where the discrete TU fuel pins are applied in theCANDU-6 reactor under the time-average equilibrium refueling. The results show that the coolant voidreactivity of the assembly analyzed in this paper is lower than that of 37-element bundle cell withnatural uranium and 37-element bundle cell with mixed TU fuel pins; that the max time-averagechannel/bundle power of the core meets the limits - less than 6700kW/860 kW; that the fuel conversionratio is higher than that of the CANDU-6 reactor with natural uranium; and that the exit burnupincreases to 13400 MWd/tU. Thus, the simulation in this paper with the fuel in the 37-element bundlecell using discrete TU fuel pins can be considered to be applied in CANDU-6 reactor with adequatemodifications of the core structure and operating modes.