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User account Linkage Across Multiple Platforms with Location Data

Journal of Computer Science & Technology 2020年第4期35卷 751-768页

作者： Wei Chen Weiqing Wang Hongzhi Yin Jun-Hua Fang Lei Zhao Institute of Artificial Intelligence School of Computer Science and TechnologySoochow UniversitySuzhou 215006China Faculty of Information Technology Monash UniversityMelbourne 3000Australia School of Information Technology and Electrical Engineering The University of QueenslandBrisbane 4072Australia

Linking user accounts belonging to the same user across different platforms with location data has received significant attention,due to the popularization of GPS-enabled devices and the wide range of applications benefiting from user account linkage(e.g.,cross-platform user profiling and recommendation).Different from most existing studies which only focus on user account linkage across two platforms,we propose a novel model ULMP(i.e.,user account linkage across multiple platforms),with the goal of effectively and efficiently linking user accounts across multiple platforms with location data.Despite of the practical significance brought by successful user linkage across multiple platforms,this task is very challenging compared with the ones across two platforms.The major challenge lies in the fact that the number of user combinations shows an explosive growth with the increase of the number of platforms.To tackle the problem,a novel method GTkNN is first proposed to prune the search space by efficiently retrieving top-k candidate user accounts indexed with well-designed spatial and temporal index structures.Then,in the pruned space,a match score based on kernel density estimation combining both spatial and temporal information is designed to retrieve the linked user accounts.The extensive experiments conducted on four real-world datasets demonstrate the superiority of the proposed model ULMP in terms of both effectiveness and efficiency compared with the state-of-art methods.

关键词： user account linkage multiple platform check-in record

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Privacy Protection for Blockchains with account and Multi-Asset Model

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China Communications 2019年第6期16卷 69-79页

作者： Donghui Ding Kang Li Linpeng Jia Zhongcheng Li Jun Li Yi Sun Institute of Computing Technology Chinese Academy of SciencesBeijing 100190China State key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China University of Chinese Academy of Sciences Beijing 100049China Ant Financial Services Group Hangzhou 310012China

The blockchain technology has been applied to wide areas.However,the open and transparent properties of the blockchains pose serious challenges to users’privacy.Among all the schemes for the privacy protection,the zero-knowledge proof algorithm conceals most of the private information in a transaction,while participants of the blockchain can validate this transaction without the private information.However,current schemes are only aimed at blockchains with the UTXO model,and only one type of assets circulates on these blockchains.Based on the zero-knowledge proof algorithm,this paper proposes a privacy protection scheme for blockchains that use the account and multi-asset model.We design the transaction structure,anonymous addresses and anonymous asset metadata,and also propose the methods of the asset transfer and double-spending detection.The zk-SNARKs algorithm is used to generate and to verify the zero-knowledge proof.And finally,we conduct the experiments to evaluate our scheme.

关键词： blockchain privacy protection zero-knowledge proof algorithm account and multi-asset model

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Pain or Gain?Chinese Experience of Capital account Liberalization

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China & World Economy 2019年第5期27卷 79-107页

作者： Hongfeng Peng Jingwen Yu School of Finance Shandong University of Finance and EconomicsChina School of Economics and Management Wuhan UniversityChina

The neoclassical growth model predicts that capital account liberalization could potentially enhance economic performance;however, there is no consistent empirical evidence to support this positive association. Using a novel dataset of Chinese capital account openness, this paper demonstrates a positive relationship between capital account liberalization and aggregate economic performance. The difference-indifferences method is used to capture the causal effect of capital account liberalization on economic performance by taking advantage of variations in both external financial dependence and the progress of capital account openness. We investigate three channels that could strengthen this positive relationship using a firm-level dataset. We find that capital account liberalization could:(i) alleviate the degree of resource misallocation, and this effect is more significant in industries relying heavily on external finance and in regions with more favorable business environments;(ii) enhance firms' total factor productivity;and (iii) promote innovation. Our findings suggest that a strategy of gradual openness will leave some leeway not only for improvement in domestic markets but also to mitigate exposure to unfavorable global shocks.

关键词： capital account liberalization difference-in-differences innovation productivity

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Microbes: the hidden giant behind the biogeochemical cycling of elements in the hydrosphere

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Science China(Life Sciences) 2019年第10期62卷 1271-1274页

作者： Li Huang Xiang Xiao Guoping Zhao State Key Laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Microbial Metabolism School of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai 200240 China Key Laboratory of Synthetic Biology Institute of Plant Physiology & EcologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200032China

Microbes are the oldest inhabitants of Earth. Through billions of years of coevolution with Earth, these creatures, usually invisible to the naked eye, have contributed to shaping the Earth surface, creating an ecosystem habitable for higher organisms including humans. By some estimates, microbes account for up to half of the biomass on the planet today (Whitman et al., 1998). They thrive in every corner of Earth, including harsh habitats such as hot springs, hydrothermal vents, salt and soda lakes, acid mine drainage, deep subsurface, and thus define the boundaries of the biosphere. Microbes also exhibit immense genetic and metabolic diversity. Therefore, it is not surprising that these organisms play a pivotal role in driving elemental cycling on Earth, a process essential for maintaining the habitability of the planet Earth.

关键词： Earth surface such as account for

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account Based Ticketing: The Benefits and Drivers for Transit Operators

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Journal of Transportation Technologies 2018年第4期8卷 331-342页

作者： Khaled Zohdi Zamer Al Fattan Currency House 23rd Floor DIFC Dubai United Arab Emirates

This paper aims to explore the importance and efficiency of using open payment cards in transit applications as an alternative to current propitiatory cards. This data can be beneficial to transit planners, from regular operation of the transit system down to the long-term strategic planning of the network. This paper covers several aspects of open payment cards in the transit planning context. First, the methods of payments are presented: cash, debit/credit cards, proprietary cards, and mobile payments. Then the several cases where open payments on transit are beneficial. Also reported are open card payment research conducted around the globe. Finally, the most promising online survey is performed to measure the perspective of the rider on using account-based ticketing versus the traditionally closed loop scheme. Mobility and payments are foundations pillars for developing communities and advancing economy [1].

关键词： Transit Payments Open Payments Integrated Payments Ecosystem account Based Ticketing

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Floristic account of the Asclepiadaceous Species from the Flora of Dera Ismail Khan District, KPK, Pakistan

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American Journal of Plant Sciences 2012年第1期3卷 141-149页

作者： Sarfaraz Khan Marwat Mir Ajab Khan Mushtaq Ahmad Muhammad Zafar Khalid Usman 不详

In the present study an account is given of an investigation based on the results of the floristic research work conducted between 2005 and 2007 in Dera Ismail Khan District, north western Pakistan. The area was surveyed and 8 Asclepi- adaceous plant species were collected. These plant species are Calotropis procera (Aiton) W. T. Aiton. Caralluma edulis (Edgew.) Benth., Leptadenia pyrotecnica (Forssk.) Decne., Oxystelma esculentum (L. f.) R. Br., Pentatropis nivalis (J. F. Gmel.) D. V. Field & J. R. I. Wood, Pergularia daemia (Forssk.) Blatt.& McCann., Periploca aphylla Decne. and Stapelia gigantea N.E.Br. The study showed that five plants were used ethnobotanically in the area. All the plants were deposited as voucher specimens in the Department of plant sciences, Quaid-i-Azam University, Islamabad, for future references. Complete macro & microscopic detailed morphological features of the species have been discussed. Taxo- nomic key was developed to differentiate closely related taxa.

关键词： Taxonomic account Asclepiadaceae Dera Ismail Khan Pakistan

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Global Imbalance Adjustment:Stylized Facts,Driving Factors and China's Prospects

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China & World Economy 2019年第6期27卷 79-103页

作者： Ming Zhang Yao Liu Institute of World Economics and Politics Chinese Academy of Social SciencesChina Graduate School of Chinese Academy of Social Sciences China

This paper summarizes global imbalance adjustment after the GFC and analyzes the evolution of balance of payments using a four-quadrant diagram.We construct the framework of a stock adjustment mechanism to analyze the main driving factors for the imbalance in surplus/deficit countries and debtors/creditors in an attempt to determine the sustainability of imbalance adjustment.We find that imbalances have been reduced to some extent,but most countries have not achieved rebalance after the global financial crisis.Therefore,we propose an ideal path for global imbalance adjustment and summarize the policy practices of representative countries that have followed this route.Based on our analysis,we suggest that China should learn from the Australian experience and adopt a macro-prudential assessment policy,actively adjust the domestic economic structure and optimize the structure of balance ofpayments.

关键词： current account flow adjustment global imbalance net foreign assets stock adjustment

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Nonlinear Capital Flow Tax: Capital Flow Management and Financial Crisis Prevention in China

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China & World Economy 2019年第4期27卷 1-28页

作者： Jiandong Ju Li Li Guangyu Nie Kang Shi Shang-Jin Wei PBC School of Finance Tsinghua University China Jinan University-University of Birmingham Joint Institute China College of Business Shanghai University of Finance and Economics China Department of Economics The Chinese University of Hong Kong China Business School Columbia University USA

How to promote capital account liberalization while preventing financial crises is a challenging task for policymakers. This study proposes a nonlinear (progressive) capital flow tax as a solution. We first demonstrate that the collateral requirement of international borrowing can give rise to multiple equilibria and self-fulfilling financial crises. We then show that the crisis equilibrium characterized by large exchange rate depreciation, capital flight and welfare loss can be eliminated by imposing a nonlinear (progressive) tax scheme on capital outflows with the marginal tax rate increasing with the size of individual capital outflows. The implementation of such a tax scheme in China is also discussed.

关键词： capital account openness financial crisis nonlinear capital flow tax

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Analysis of the Impact of Treasury Single account on the Performance of Banks in Nigeria

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Open Journal of Statistics 2018年第3期8卷 457-467页

作者： Chukwudi J. Ogbonna Harrison O. Amuji Department of Statistics Federal University of Technology Owerri Nigeria

In this study, we developed multivariate model for the study of the impact of treasury single account (TSA) on the performance of banks in Nigeria. From the study, we discovered that there was no significant difference between the period before and after the introduction of the TSA policy on the performance of banks in Nigeria. In Diamond Bank Nigeria Plc, we observed that there were negative relationships between liquidity ratio and capital adequacy with correlation coefficient of -0.093;liquidity ratio and credit to customers with correlation coefficient of -0.312;capital adequacy and credit to customers with correlation coefficient of -0.176. On the other hand, from the analysis on first bank, we observed that there were both positive and fairly strong relationships between the liquidity ratio and capital adequacy with correlation coefficient of 0.626;negative relationship between liquidity ratio and credit to customers with correlation coefficient of -0.880 and finally, negative relationship between capital adequacy and credit to customers with correlation coefficient of -0.165.

关键词： Treasury Single account Multivariate Analysis Liquidity Ratio Capital Adequacy Ratio Credit to Customer

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Application of FTAM in Global Roam account System

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Journal of Southeast University(English Edition) 1997年第2期13卷 102-107页

作者：方宁生

ＡｐｐｌｉｃａｔｉｏｎｏｆＦＴＡＭｉｎＧｌｏｂａｌＲｏａｍＡｃｏｕｎｔＳｙｓｔｅｍＦａｎｇＮｉｎｇｓｈｅｎｇ（方宁生）（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｍｐｕｔｅｒＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉｎｇ，Ｓｏｕｔ... 详细信息

ＡｐｐｌｉｃａｔｉｏｎｏｆＦＴＡＭｉｎＧｌｏｂａｌＲｏａｍＡｃｏｕｎｔＳｙｓｔｅｍＦａｎｇＮｉｎｇｓｈｅｎｇ（方宁生）（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｍｐｕｔｅｒＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉｎｇ，ＳｏｕｔｈｅａｓｔＵｎｉｖｅｒｓｉｔｙ，Ｎ...

关键词： computer network mobile communications FTAM roaming account

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