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Journal of Southeast University(English Edition) 2019年第2期35卷 228-235页

作者： Ji Yanjie Cao Yu Liu Yang Ma Xinwei School of Transportation Southeast UniversityNanjing 211189China

In order to study the spatiotemporal characteristics of the dockless bike sharing system(BSS)around urban rail transit stations,new normalized calculation methods are proposed to explore the temporal and spatial usage patterns of the dockless BSS around rail transit stations by using 5-weekday dockless bike sharing trip data in Nanjing,***,the rail transit station area(RTSA)is defined by extracting shared bike trips with trip ends falling into the ***,the temporal and spatial decomposition methods are developed and two criterions are calculated,namely,normalized dynamic variation of bikes(NDVB)and normalized spatial distribution of trips(NSDT).Furthermore,the temporal and spatial usage patterns are clustered and the corresponding geographical distributions of shared bikes are *** results show that four temporal usage patterns and two spatial patterns of dockless BSS are finally *** type(urban center and suburb)has a great influence on temporal usage *** usage patterns are irregular and affected by limited directions,adjacent rail transit stations and street *** findings can help form a better understanding of dockless shared bike users behavior around rail transit stations,which will contribute to improving the service and efficiency of both rail transit and BSS.

关键词： dockless bike sharing system rail transit station usage pattern cluster

A scheduling algorithm with dynamic properties in mobile grid

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Frontiers of Computer Science 2014年第5期8卷 847-857页

作者： JongHyuk LEE SungJin CHOI JoonMin GIL Taeweon SUH HeonChang YU Software R&D Center Samsung Electronics Gyeonggi-do 443-742 Republic of Korea Media Solution Center Samsung Electronics Gyeonggi-do 443-742 Republic of Korea School of Information Technology Engineering Catholic University of Daegu Gyeongsangbuk-do 712-702 Republic of Korea Graduate School of Information Security Korea University Seoul 136-701 Republic of Korea Department of Computer Science and Engineering Korea University Seoul 136-701 Republic of Korea

Mobile grid is a branch of grid computing that incorporates mobile devices into the grid infrastructure. It poses new challenges because mobile devices are typically resource-constrained and exhibit unique characteristics such as instability in network connections. New scheduling strate- gies are imperative in mobile grid to efficiently utilize the devices. This paper presents a scheduling algorithm that con- siders dynamic properties of mobile devices such as avail- ability, reliability, maintainability, and usage pattern in mo- bile grid environments. In particular, usage patterns caused by voluntarily or involuntarily losing a connection, such as switching off the device or a network interruption could be important criteria for choosing the best resource to execute a job. The experimental results show that our scheduling al- gorithm provides superior performance in terms of execution time, as compared to the other methods that do not consider usage pattern. Throughout the experiments, we found it es- sential to consider usage pattern for improving performance in the mobile grid.

关键词： mobile grid scheduling dynamic properties,availability reliability maintainability usage pattern

Storage capacity model for cloud download

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The Journal of China Universities of Posts and Telecommunications 2012年第5期19卷 83-91页

作者： XU Ying-ying AO Nai-xiang CHEN Chang-jia School of Electronics and Information Engineering Beijing Jiaotong UniversityBeijing 100044China

With the rise and world wide deployment of cloud utilities, the principle of the cloud download is proposed to provide high-quality file content distribution by using dedicated servers as cloud cache to guarantee the data availability and enhance the data transfer rate. As the system scales up to a large population, how to design appropriate storage capacity of cloud cache is a key challenge for cloud download. In this paper, primary elements impacting on storage capacity are explored through deliberating in large-scale commercial cloud download system, i.e. general user usage pattern and available period. And based on statistical analysis of real-world traces, we formulate storage capacity related to these two elements, which is the original contribution different from all previous works. This model gives guidance of potential system policy design. Finally, the effectivity of this model is demonstrated by simulation results compared with empirical data of practical system.

关键词： cloud download storage capacity model available period usage pattern

Exploring the user platform preference and user interest preference of Chinese scholarly articles:A comparison based on usage metrics

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Journal of Library Science in China 2019年 98-116页

作者： CHEN Bikun ZHOU Huixian ZHONG Zhouyan WANG Yuefen Department of Information Management School of Economics&ManagementNanjing University of Science&TechnologyNanjingJiangsu 210094China

In order to comparatively investigate usage patterns of journal official sites and pay-for-access platform and then to support decision-making,this study selected academic papers,published during 2014-2015,of 61 Chinese open access journals indexed by CSSCI and CSCD in eight disciplines,"Library,Information and Archival Science","Management Science","Economics","Pedagogy","Computer Science","Earth Science","Math"and"Biology".Chinese usage patterns in user platform preferences and user interest preferences were explored by analyzing usage data from journal official sites and pay-for-access ***,comparisons of user platform preferences were implemented by descriptive statistics and correlation analysis and comparisons of user interest preferences were explored by Jaccard similarity coefficient and co-word *** proved that there were differences in user platform preferences and user interest preferences between journal official sites and pay-for-access ***,factors that affect usage patterns were very *** to probe into the mechanism of contributory factors and then verify them was still an important problem to be solved in further study.

关键词： Academic literature usage data usage metrics Academic journals Academic communication usage pattern

User-Centric Prediction for Battery Lifetime of Mobile Devices

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User-Centric Prediction for Battery Lifetime of Mobile Devic...

An Investigation of English Articles' Acquisition by Chinese Learners of English

The 11th Asia-Pacific Network Operations and Management Symposium

作者： Joon-Myung Kang Chang-Keun Park Sin-Seok Seo Mi-Jung Choi James Won-Ki Hong Dept. of Computer Science and Engineering POSTECHRepublic of Korea

Today, mobile devices are being used for various applications such as making voice/video calls, browsing Internet and so on. The op- erating time and battery consumption spent in those activities affect the battery life of mobile devices. In this paper, we propose a method for pre- dicting the battery lifetime of mobile devices based on usage patterns. We define the possible states of mobile devices based on their operating functions and develop a method of predicting battery lifetime based on average battery consumption and duration of each state.

关键词： Battery Lifetime Prediction usage pattern Power Man- agement

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Chinese Journal of Applied Linguistics 2010年第3期33卷 15-31,126页

作者：李海燕杨连瑞山东省文登师范学校中国海洋大学外国语学院

英语冠词习得过程是二语习得领域研究热点之一。本研究调查了高级,中级,中下英语水平学习者对英语冠词的掌握情况,研究结果表明中国学生英语冠词的使用正确率从高到低排序为:the,a/an,Φ。中级及中下级英语水平学习者存在the与a/an使用... 详细信息

英语冠词习得过程是二语习得领域研究热点之一。本研究调查了高级,中级,中下英语水平学习者对英语冠词的掌握情况,研究结果表明中国学生英语冠词的使用正确率从高到低排序为:the,a/an,Φ。中级及中下级英语水平学习者存在the与a/an使用过度而零冠词使用不足的情况;高级水平者倾向于将零冠词泛化。不同语境中冠词运用正确率的对比分析表明:中级水平者类指名词前以及固定搭配中冠词的运用相对困难;高级水平者[-HK](假定听话者未知)语境中的冠词用法掌握较差。本研究对英语冠词教学有一定的启示作用。

关键词： articles’ acquisition accuracy order usage pattern difficulty