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An approach to quality assessment for web service selection based on the analytic hierarchy process for cases of incomplete information

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Science China(Information Sciences) 2015年第12期58卷 75-88页

作者： gao Cong MA JianFeng LIU ZhiQuan MA xindi School of Computer Science and Technology Xidian University

Since web services intended for the same application environment tend to be functionally homogeneous, researchers have turned to their non-functional aspects in order to constructively compare web services and choose an appropriate one. In general, quality of service is very important to users. Many schemes that consider quality assessment have been proposed for web service selection. With the increasing number of qualityrelated attributes, an effective quality assessment method needs satisfactory scalability. Schemes based on the analytic hierarchy process(AHP) meet this requirement. However, prevalent methods in this vein overlook the fact that the traditional AHP needs a complete judgment matrix. In practice, all the information needed to construct a judgment matrix is often unavailable for a variety of reasons, due to which certain judgments cannot be made. In this paper, for an incomplete judgment matrix, we propose an improved AHP approach to consistency verification and the subsequent ordering. Our method can deal with situations where information is insufficient,and inherits all the merits of the traditional AHP approach. A case study establishes the effectiveness of our proposed method.

关键词： incomplete information quality assessment analytic hierarchy process(AHP) web services qual ity of service selection

APRS: a privacy-preserving location-aware recommender system based on differentially private histogram

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Science China(Information Sciences) 2017年第11期60卷 297-306页

作者： Sheng gao xindi MA Jianming ZHU Jianfeng MA School of Information Central University of Finance and Economics School of Computer Science and Technology Xidian University School of Cyber Engineering Xidian University

Appendix A Preliminaries In this section,we present some preliminaries that server as the basis of *** convenience,the notations used in this paper are listed in Tabel A1.

关键词： a privacy-preserving location-aware recommender system based on differentially private histogram Si

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RTRC:A Reputation-Based Incentive Game Model for Trustworthy Crowdsourcing Service

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China Communications 2016年第12期13卷 199-215页

作者： xindi Ma Jianfeng Ma Hui Li Qi Jiang Sheng gao School of Computer Science and Technology Xidian University School of Cyber Engineering Xidian University School of Computer & Software Nanjing University of Information Science & Technology School of Information Central University of Finance and Economics

The ubiquity of mobile devices have promoted the prosperity of mobile crowd systems, which recruit crowds to contribute their resources for performing tasks. Yet, due to the various resource consumption, the crowds may be reluctant to join and contribute information. Thus, the low participation level of crowds will be a hurdle that prevents the adoption of crowdsourcing. A critical challenge for these systems is how to design a proper mechanism such that the crowds spontaneously act as suppliers to contribute accurate information. Most of existing mechanisms ignore either the honesty of crowds or requesters respectively. In this paper, considering the honesty of both, we propose a game-based incentive mechanism, namely RTRC, to stimulate the crowds to contribute accurate information and to motivate the requesters to return accurate feedbacks. In addition, an evolutionary game is designed to model the dynamic of user-strategy selection. Specially, the replicator dynamic is applied to model the adaptation of strategy interactions taking into account the dynamic nature in time dependence and we also derive the evolutionarily stable strategies(ESSs) for users. Finally, empirical results over the simulations show that all the requesters and suppliers will select honest strategy to maximize their profit.

关键词： crowdsourcing system evolutionary game theory evolutionarily stable strategy incentive mechanism

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APPLET: a privacy-preserving framework for location-aware recommender system

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Science China(Information Sciences) 2017年第9期60卷 5-20页

作者： xindi MA Hui LI Jianfeng MA Qi JIANG Sheng gao Ning XI Di LU School of Computer Science and Technology Xidian University School of Cyber Engineering Xidian University School of Information Central University of Finance and Economics

Location-aware recommender systems that use location-based ratings to produce recommendations have recently experienced a rapid development and draw significant attention from the research ***, current work mainly focused on high-quality recommendations while underestimating privacy issues,which can lead to problems of privacy. Such problems are more prominent when service providers, who have limited computational and storage resources, leverage on cloud platforms to fit in with the tremendous number of service requirements and users. In this paper, we propose a novel framework, namely APPLET, for protecting user privacy information, including locations and recommendation results, within a cloud environment. Through this framework, all historical ratings are stored and calculated in ciphertext, allowing us to securely compute the similarities of venues through Paillier encryption, and predict the recommendation results based on Paillier,commutative, and comparable encryption. We also theoretically prove that user information is private and will not be leaked during a recommendation. Finally, empirical results over a real-world dataset demonstrate that our framework can efficiently recommend POIs with a high degree of accuracy in a privacy-preserving manner.

关键词： recommender system location-based service homomorphic encryption privacy-preserving frame work collaborative filtering

An approach to quality assessment for web service selection based on the analytic hierarchy process for cases of incomplete information

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Science China Chemistry 2015年第12期58卷 71-84页

作者： gao Cong MA JianFeng LIU ZhiQuan MA xindi School of Computer Science and Technology Xidian University

关键词： incomplete information quality assessment analytic hierarchy process (AHP) web services qual-ity of service selection

Facile fabrication of drug-loaded PEGDA microcapsules for drug evaluation using droplet-based microchip

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Chinese Chemical Letters 2022年第5期33卷 2697-2700页

作者： xindi Sun Qirui Wu Wei Li Xiuqing Gong Jun-Yi Ge Jinbo Wu Xinghua gao Materials Genome Institute Shanghai UniversityShanghai 200444China

Droplet-based microfluidic technology can be utilized as a microreactor to prepare novel functional monodisperse *** this study,a droplet-based microfluidic chip with surface modification,which allowed the one-step preparation of double emulsion *** O/W/O double emulsion using polyethylene(glycol)diacrylate(PEGDA)solution as the intermediate water phase was prepared by regulating the hydrophilicity and hydrophobicity of the chip surface,with PEGDA microcapsules prepared using UV *** then anti-tumor drug paclitaxel and neurotoxin 6-OHDA were encapsulated in microcapsules for drug and toxicology evaluation,*** to controls,drug-loaded mi-crocapsules caused a significant increase in the death rate of PC12 *** indicates that the obtained drug-loaded microcapsules could be used in drug evaluation and potentially in drug screening and deliv-ery.

关键词： PEGDA microcapsule Droplet-based microfluidic PC12 cells Drug evaluation

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Analysis of ultra-low level rare earth elements in magnetite samples from banded iron formations using HR-ICP-MS after chemical separation

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Analysis of ultra-low level rare earth elements in magnetite...

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Wenjun Li xindi Jin Bingyu gao Changle Wang Lianchang Zhang Institute of Geology and Geophysics Chinese Academy of Sciences Key Laboratory of Mineral Resources Chinese Academy of Sciences

We have investigated two methods for the separation of rare earth elements(REEs) and Fe in magnetites from banded iron formations(BIFs), employing cation- and anion-exchange chromatography. The separated REEs were subsequently determined using a high resolution inductively coupled plasma mass spectrometer(HR-ICP-MS). Our results indicated that 10 m L concentrated HCl was sufficient to completely separate all REES from Fe using anion exchange chromatography, whereas more than 30 m L of 6 mol L 1HCl was required using cation-exchange. The recovery of REEs using both methods was100% 5%. The procedure blanks for the REEs using the anion method were lower than those using the cation method. Our results indicated that the anion exchange method has advantages over cation exchange for the analysis of ultra-low level REEs in magnetites. The proposed methods were tested using the reference material FER-2.

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室内定位系统中指纹库的优化方法

西安电子科技大学学报 2015年第6期42卷 81-87页

作者：马鑫迪马建峰高胜西安电子科技大学计算机学院陕西西安710071

指纹库的好坏直接影响到室内定位的定位精度,而现有的室内定位算法大都是建立在原始指纹库的基础之上的,缺乏对指纹库的优化处理.笔者利用k-means算法优化指纹库的构建过程,通过聚类的思想剔除已采集指纹库中的"噪点",从而为室内定位算... 详细信息

指纹库的好坏直接影响到室内定位的定位精度,而现有的室内定位算法大都是建立在原始指纹库的基础之上的,缺乏对指纹库的优化处理.笔者利用k-means算法优化指纹库的构建过程,通过聚类的思想剔除已采集指纹库中的"噪点",从而为室内定位算法提供较好的数据样本源.实验结果表明,与现有的室内定位系统相比,利用优化后的指纹库进行定位能够明显提高室内定位的精度.

关键词：智能终端 k-means方法指纹库优化去噪

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Early Mesozoic tectono-magmatic activity and mineralization in Northeast China:evidence from Re-Os to U-Pb studies of the Taipingchuan porphyry Cu-Mo deposit in the Derbugan metallogenic belt

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Early Mesozoic tectono-magmatic activity and mineralization ...