Study on the Allocation Problem of the Equipment Maintenance Support Resources

Wang Hongxia,Ye Xiaohui,Yin ming 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.7

Aiming at the problems of lacking of system engineering method for the equipment maintenance support resource allocation problem, the problem to be solved for resource allocation is proposed from the three hierarchical perspective which is “what to allocate , how to allocate, and how much to allocate”; from the three aspects of the demand analysis, allocation method, optimizing allocation, the connotation of the problem is described, and for the each problem the essence of the problem solving method is studied systematically; the proposed method can provide science and technology support for the equipment maintenance support resources allocation scheme in the design phase.

One-step synthesis of Pt-Pd catalyst nanoparticles supported on few-layer graphene for methanol oxidation

Hongxia Wang,Leimei Sheng,Xinluo Zhaoa,Kang An,Zhongmin Ou,Yanghao Fang 한국물리학회 2018 Current Applied Physics Vol.18 No.8

In this study, Pt-Pd nanoparticles (NPs) supported on few-layer graphene (FLG) have been firstly prepared by one-step arc discharge evaporation of carbon electrodes containing both Pt and Pd elements. The few-layer graphene and Pt-Pd nanoparticles were achieved simultaneously through the evaporation process. After a hightemperature hydrogen treatment, the Pt-Pd/graphene was applied in the study of methanol oxidation in direct methanol fuel cell. The total weight of electrocatalyst keeps 2 wt% of the electrode. The sample with a mass ratio of Pt:Pd=3:1 (H-Pt3Pd1/G) exhibits better electrocatalytic activity (198 mA mg-1 pt) and better tolerance to carbon monoxide(CO) poisoning (If/Ib=1.26). It is noteworthy that the value of If/Ib can reach to 1.55 for the sample with the mass ratio of Pt:Pd=2:1 (H-Pt2Pd1/G),which implies its excellent ability of CO tolerance. The introduction of Pd element may open a new strategy to improve the CO tolerance by arc discharge evaporation.

Advances in the chemistry, pharmacological diversity, and metabolism of 20(R)-ginseng saponins

Wang, Chaoming,Liu, Juan,Deng, Jianqiang,Wang, Jiazhen,Weng, Weizhao,Chu, Hongxia,Meng, Qingguo The Korean Society of Ginseng 2020 Journal of Ginseng Research Vol.44 No.1

Ginseng has been used as a popular herbal medicine in East Asia for at least two millennia. However, 20(R)-ginseng saponins, one class of important rare ginsenosides, are rare in natural products. 20(R)-ginseng saponins are generally prepared by chemical epimerization and microbial transformation from 20(S)-isomers. The C20 configuration of 20(R)-ginseng saponins are usually determined by ¹³C NMR and X-ray single-crystal diffraction. 20(R)-ginseng saponins have antitumor, antioxidative, antifatigue, neuroprotective, and osteoclastogenesis inhibitory effects, among others. Owing to the chemical structure and pharmacological and stereoselective properties, 20(R)-ginseng saponins have attracted a great deal of attention in recent years. In this study, the discovery, identification, chemical epimerization, microbial transformation, pharmacological activities, and metabolism of 20(R)-ginseng saponins are summarized.

Geometrically Invariant Image Watermarking Using Connected Objects and Gravity Centers

( Hongxia Wang ),( Bangxu Yin ),( Linna Zhou ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.11

The design of geometrically invariant watermarking is one of the most challenging work in digital image watermarking research area. To achieve the robustness to geometrical attacks, the inherent characteristic of an image is usually used. In this paper, a geometrically invariant image watermarking scheme using connected objects and gravity center is proposed. First, the gray-scale image is converted into the binary one, and the connected objects according to the connectedness of binary image are obtained, then the coordinates of these connected objects are mapped to the gray-scale image, and the gravity centers of those bigger objects are chosen as the feature points for watermark embedding. After that, the line between each gravity center and the center of the whole image is rotated an angle to form a sector, and finally the same version of watermark is embedded into these sectors. Because the image connectedness is topologically invariant to geometrical attacks such as scaling and rotation, and the gravity center of the connected object as feature points is very stable, the watermark synchronization is realized successfully under the geometrical distortion. The proposed scheme can extract the watermark information without using the original image or template. The simulation results show the proposed scheme has a good invisibility for watermarking application, and stronger robustness than previous feature-based watermarking schemes against geometrical attacks such as rotation, scaling and cropping, and can also resist common image processing operations including JPEG compression, adding noise, median filtering, and histogram equalization, etc.

Ethylene Control of Flowering and Sex Differentiation in Three Sex Types of Inbred Melon Lines

Hongxia Ye,Tonglin Wang,Lv Lv,Yuqing Hu,Bingliang Wang 한국원예학회 2020 원예과학기술지 Vol.38 No.4

Flower types and sex expression are important traits for melon (Cucumis melo L.) and hybrid seed production. Here, we studied the effects of ethrel, aminoethoxyvinylglycine (AVG) and silver nitrate (AgNO3) on floral development and sex expression in andromonoecious, monoecious, and hermaphroditic inbred melon lines in an experimental field at Zhejiang University, Hangzhou China during the autumn of 2017. The application of 100, 200, and 400 µL·L-1 of 40% ethrel delayed the initiation of male/bisexual flowers on the main stem and inhibited the formation of lateral branches bearing female/bisexual flowers. Ethrel exposure changed the flower sex type on the main stem of the three inbred melon lines. Melon sexual types could be converted from andromonoecious to hermaphroditic, from monoecious to gynoecious, and from hermaphroditic to gynomonoecious/gynoecious and be devoid of buds destined to be male flowers. The three inbred melon lines responded differently to ethrel during floral development and sex transition, with the monoecious line being the most sensitive and the hermaphroditic line being the most insensitive. The inhibitor of ethylene biosynthesis, AVG (100 mg·L-1), and the inhibitor of ethylene action, AgNO3 (300 mg·L-1), were ineffective in altering sex expression. However, the male/bisexual flowers on the main stem formed at lower nodes in AVG- or AgNO3-treated plants, resulting in earlier flower initiation for the hermaphroditic line. Thus, the application of AVG or AgNO3 promoted earlier fruit setting in hermaphroditic melon. In addition, the use of ethrel to induce male sterility in melon could replace the expensive labor necessary for the mechanical emasculation of hybrids and ensure hybrid seed purity.

NDFT-based Image Steganographic Scheme with Discrimination of Tampers

( Hongxia Wang ),( Mingquan Fan ) 한국인터넷정보학회 2011 KSII Transactions on Internet and Information Syst Vol.5 No.12

A new and secure image steganographic scheme based on nonuniform discrete Fourier transform (NDFT) is proposed in this paper. First, the chaotic system is introduced to select embedding points randomly in NDFT domain suitable range, and NDFT is implemented on every non-overlapping block of eight consecutive pixels. Second, the secret messages are scrambled by chaotic systems, and embedded into frequency coefficients by quantization method. The stego-image is obtained by inverse NDFT (INDFT). Besides, in order to discriminate tampers, the low frequency wavelet coefficients of 7 most significant bits (MSBs) of the stego-image are converted into the binary sequence after nonuniform scalar quantization. Then the obtained binary sequence is scrambled by the chaotic systems, and embedded into the least significant bit (LSB) of the stego-image. Finally, the watermarked stego-image can be obtained by a new improved LSB steganographic method. The embedded secret messages can be extracted from the watermarked stego-image without the original cover image. Experimental results show the validity of the proposed scheme, and dual statistics attacks are also conducted to indicate the security.

Application of VCG in Replica Placement Strategy of Cloud Storage

Wang Hongxia 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.4

With the rapid development of the cloud computing and big data, many data center network are growing more large scale, and the number of servers is increasing at an exponential rate. In this paper, VCG (Vickrey-Clarke-Groves) mechanism was introduced into replica placement. Mapping from replica placement model to VCG mechanism was established and suitable payment function was designed. Data storage strategy is built on the distributed file system. In order to ensure the reliability of data storage GFS and HDFS are further both referred to the concept of replica of data block. This paper generally introduced replica strategy, and mentioned that the storage location of data replica is a key point of the research on replica technology currently. This paper mainly applied one cloud platform simulation tool---the CloudSim to simulate the algorithm. The performance of the algorithm was analyzed in the CloudSim platform and compared it with other related algorithms. The simulation experiments were done on the replica placement strategy of the data block, which shows that replica placement strategy can also achieve the established goal.

Study on Predictive Maintenance Strategy

Hongxia Wang,Xiaohui Ye,Ming Yin 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.4

Predictive Maintenance is the catchword in the present times. First ,the paper analyze the feature of the Predictive Maintenance, include scientific, approximation, timeliness, condition monitoring, fault diagnostic and so on, second the technology system for Predictive maintenance has been studied, including: condition monitoring technology, fault diagnosis technology, state prediction and maintenance decision support and maintenance activities. Finally, the Strategies of Predictive maintenance is given.

Evaluation of sex attractants for monitoring of Illiberis ulmivora Graeser (Lepidoptera: Zygaenidae: Procridinae): Height, distance, placement, climatic conditions

Liu Hongxia,Dou Rui,Wang Jifei,Zhu Yachao,Li Jingyao,Liu Jinlong,Wang Yang,Zhang Jintong,Jing Xiaoyuan 한국곤충학회 2022 Entomological Research Vol.52 No.2

The phytophagous caterpillar Illiberis ulmivora is a serious pest of Ulmus glaucescens Franch (Ulmaceae, Ulmus). In order to test potent sex attractant, field trails of synthetic candidate attractants were conducted in China. In this study, baits with ternary blends, (2S)-butyl (7Z)-dodecenoate, (2S)-butyl (9Z)-tetradecenoate, and (2S)-butyl (5Z)-decenoate (8:4:1 ratio) resulted in a higher number of male moths capture than the rest of the baits that were offered. Traps positioned at a height of 1.2 m attracted more males than those installed at heights of 2.2 m and 3.2 m. The slope aspect, temperature and humility had a significant effect on the trap catches. More catches occurred in traps placed on semi-shady and semi-sunny slopes than those placed on sunny and shady slopes. The number of pheromones in the septa decreased with age. The residual amounts of pheromones in the lures combined with 2,6-di-tert - butyl-p-cresol (BHT) were higher than those in the control. However, there were no differences in the male captures between components and components combined with BHT during the first 8 d. These findings on monitoring and trap positions can be used to predict the occurrence and population dynamics of I. ulmivora, to develop ecological management of I. ulmivora.

Advances in the chemistry, pharmacological diversity, and metabolism of 20(R)-ginseng saponins

Chaoming Wang,Juan Liu,Jianqiang Deng,Jiazhen Wang,Weizhao Weng,Hongxia Chu,Qingguo Meng 고려인삼학회 2020 Journal of Ginseng Research Vol.44 No.1

Ginseng has been used as a popular herbal medicine in East Asia for at least two millennia. However,20(R)-ginseng saponins, one class of important rare ginsenosides, are rare in natural products. 20(R)-ginseng saponins are generally prepared by chemical epimerization and microbial transformation from20(S)-isomers. The C20 configuration of 20(R)-ginseng saponins are usually determined by 13C NMR andX-ray single-crystal diffraction. 20(R)-ginseng saponins have antitumor, antioxidative, antifatigue, neuroprotective,and osteoclastogenesis inhibitory effects, among others. Owing to the chemical structureand pharmacological and stereoselective properties, 20(R)-ginseng saponins have attracted a great dealof attention in recent years. In this study, the discovery, identification, chemical epimerization, microbialtransformation, pharmacological activities, and metabolism of 20(R)-ginseng saponins are summarized.