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Exposing image forgery by detecting traces of feather operation 20

Exposing image forgery by detecting traces of feather operat...

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20th International Conference on Distributed Multimedia Systems, DMS 2014

作者： Zheng, Jiang Bin Zhu, Ting Ge Li, Zhe Xing, Wei Wei Ren, Jin Chang Dept of Computer Science and Engineering School of Computer Northwestern Polytechnical University Xi’an China School of Software Engineering Beijing Jiaotong University Beijing China Dept of Electronic and Electrical Engineering University of Strathclyde GlasgowG1 1XW United Kingdom

ISBN: (纸本)1891706365

Powerful digital image editing tools make it very easy to produce a perfect image forgery. The feather operation is necessary when tampering an image by copy-paste operation because it can help the boundary of pasted object to blend smoothly and unobtrusively with its surroundings. We propose a blind technique capable of detecting traces of feather operation to expose image forgeries. We model the feather operation, and the pixels of feather region will present similarity in their gradient phase angle and feather radius. An effectual scheme is designed to estimate each feather region pixel’s gradient phase angle and feather radius, and the pixel’s similarity to its neighbor pixels is defined and used to distinguish the feathered pixels from unfeathered pixels. The degree of image credibility is defined, and it is more acceptable to evaluate the reality of one image than just using a decision of YES or NO. Results of experiments on several forgeries demonstrate the effectiveness of the technique. © 2014 by Knowledge Systems Institute Graduate School.

关键词： Pixels

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Fast range query processing with strong privacy protection for cloud computing 40th

Fast range query processing with strong privacy protection f...

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Proceedings of the 40th International Conference on Very Large Data Bases, VLDB 2014

作者： Li, Rui Liu, Alex X. Wang, Ann L. Bruhadeshwar, Bezawada College of Computer Science and Electronic Engineering Hunan university ChangSha China Dept. of Computer Science and Engineering Michigan State University East LansingMI United States National Key Laboratory for Novel Software Technology Nanjing University Nanjing210023 China

Privacy has been the key road block to cloud computing as clouds may not be fully trusted. This paper concerns the problem of privacy preserving range query processing on clouds. Prior schemes are weak in privacy protection as they cannot achieve index indistinguishability, and therefore allow the cloud to statistically estimate the values of data and queries using domain knowledge and history query results. In this paper, we propose the first range query processing scheme that achieves index indistinguishability under the indistinguishability against chosen keyword attack (INDCKA). Our key idea is to organize indexing elements in a complete binary tree called PBtree, which satisfies structure indistinguishability (i.e., two sets of data items have the same PBtree structure if and only if the two sets have the same number of data items) and node indistinguishability (i.e., the values of PBtree nodes are completely random and have no statistical meaning). We prove that our scheme is secure under the widely adopted IND-CKA security model. We propose two algorithms, namely PBtree traversal width minimization and PBtree traversal depth minimization, to improve query processing efficiency. We prove that the worse case complexity of our query processing algorithm using PBtree is O(|R| log n), where n is the total number of data items and R is the set of data items in the query result. We implemented and evaluated our scheme on a real world data set with 5 million items. For example, for a query whose results contain ten data items, it takes only 0.17 milliseconds. © 2014 VLDB Endowment 21508097/14/10.

关键词： Query processing

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REED: A Reliable Energy-Efficient RAID

REED: A Reliable Energy-Efficient RAID

引用

International Conference on Parallel Processing (ICPP)

作者： Shu Yin Xuewu Li Kenli Li Jianzhong Huang Xiaojun Ruan Xiaomin Zhu Wei Cao Xiao Qin School of Information Science & Engineering National Supercomputing Center in Changsha Changsha China Dept. of Computer Science Huazhong Univ. of Sci. and Tech. Wuhan China Dept. of Computer Science West Chester Univ. of Pennsylvania PA Sci. & Tech. on Information System Eng. Lab National University of Defense Technology Changsha China Hubei Meteorological Information. & Technology Support Center Wuhan China Dept. of Compter Sci. & Software Eng. Auburn University AL

ISBN: (纸本)9781467375887

Recent studies indicate that the energy cost and carbon footprint of data centers have become exorbitant. It is a demanding and challenging task to reduce energy consumption in large-scale storage systems in modern data centers. Most energy conservation techniques inevitably have adverse impacts on parallel disk systems. To address the reliability issues of energy-efficient parallel disks, we propose a reliable energy-efficient RAID system called REED, which aims at improving both energy efficiency and reliability of RAID systems by seamlessly integrating HDDs and SSDs. At the heart of REED is a high-performance cache mechanism powered by SSDs, which are serving popular data. Under light workload conditions, REED spins down HDDs into the low-power mode, thereby offering energy conservation. Importantly, during an I/O access turbulence (i.e., I/O load is dynamically and frequently changing), REED is conducive to reducing the number of disk power-state transitions by keeping HDDs in the low-power mode while serving requests with SSDs. We build a model to quantitatively show that REED is capable of improving the reliability of energy-efficient RAIDs. We implement the REED prototype in a real-world RAID-0 system. Our experimental results demonstrate that REED improves the energy-efficiency of conventional RAID-0 by up to 73% while maintaining good reliability.

关键词： Reliability Solids Electronic mail Energy consumption Energy conservation Energy storage Power demand

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What special about Top-N recommendation for mobile app stores 2

What special about Top-N recommendation for mobile app store...

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2nd International Conference on Information Technology and Electronic Commerce, ICITEC 2014

作者： Zhu, Taojiang Yan, Jiabao Zhao, Ying Dept. of Computer Science and Technology Tsinghua University Beijing China Dept. of Software Engineering Tsinghua University Beijing China Research Institute Tsinghua University in Shenzhen China

ISBN: (纸本)9781479952984

As the number of mobile applications grows rapidly, personalized recommendation for mobile apps becomes more and more important to mobile App stores. While most of the current works focused on proposing novel recommendation models for mobile apps, the lack of understanding of user download behaviors still remains a problem. Towards this end, we conducted a user behavior study on a large scale real world dataset, focusing on three kinds of biases to user download behaviors, namely, browsing history, app update history, and app categories. The dataset we used in this paper was constructed from Mobile Market (MM), an online mobile app store released by China Mobile, server logs from April 16, 2013 to June 13, 2013, containing 12,125,702 users and 67,577 apps. © 2014 IEEE.

关键词： Behavioral research

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A hybrid tracking system for ZigBee WSNs

A hybrid tracking system for ZigBee WSNs

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2014 6th International Conference on computer science and Information Technology, CSIT 2014

作者： Alhmiedat, Tareq Omar, Firas Taleb, Anas Abu Dept. of Information Technology Tabuk University Tabuk Saudi Arabia Dept. of Software Engineering Zarqa University Zarqa Jordan Dept. of Computer Science Isra University Amman Jordan

ISBN: (纸本)9781479939992

Target localization and tracking problems in Wireless Sensor Networks (WSNs) have received considerable attention recently, driven by the need to achieve high localization accuracy, with the minimum cost possible. A wide range of proposed approaches regarding the localization area have emerged, however most of them suffer from either requiring an extra sensor, high power consumption, inaccessible indoors, or offer high localization error. This paper presents a research and development of a hybrid WSN tracking system using the Received Signal Strength Indicator (RSSI) and the inertial system. The proposed system is an efficient indoors, where it offers reasonable localization accuracy (0.1 - 0.7) meters, and achieves low power consumption. A number of real experiments have been conducted to test the efficiency of the proposed system using XBee modules. © 2014 IEEE.

关键词： Zigbee

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API document quality for resolving deprecated APIs 21

API document quality for resolving deprecated APIs

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21st Asia-Pacific software engineering Conference, APSEC 2014

作者： Ko, Deokyoon Ma, Kyeongwook Park, Sooyong Kim, Suntae Kim, Dongsun Traon, Yves Le Dept. of Computer Science and Engineering Sogang University Seoul Korea Republic of Dept. of Software Engineering Cheonbuk National University Jeonju Si Jeollabuk Do Korea Republic of University of Luxembourg SnT Luxembourg Luxembourg

ISBN: (纸本)9781479974252

Using deprecated APIs often results in security vulnerability or performance degradation. Thus, invocations to deprecated APIs should be immediately replaced by alternative APIs. To resolve deprecated APIs, most developers rely on API documents provided by service API libraries. However, the documents often do not have sufficient information. This makes many deprecated API usages remain unresolved, which leads programs to vulnerable states. This paper reports a result of studying document quality for deprecated APIs. We first collected 260 deprecated APIs of eight Java libraries as well as the corresponding API documents. These documents were manually investigated to figure out whether it provides alternative APIs, rationales, or examples. Then, we examined 2,126 API usages in 249 client applications and figured out whether those were resolved in the subsequent versions. This study revealed that 1) 3.6 APIs was deprecated and 3.6 deprecated APIs are removed from the library a month on average, 2) only 61% of API documents provided alternative APIs while rationale and examples were rarely documented, and 3) 62% of deprecate API usages in client applications were resolved if the corresponding API documents provided alternative APIs while 49% were resolved when the documents provided no alternative APIs. Based on these results, we draw future directions to encourage resolving deprecated APIs. © 2014 IEEE.

关键词： Libraries

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A systematic view of agent-supported simulation: Past, present, and promising future 4

A systematic view of agent-supported simulation: Past, prese...

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4th International Conference on Simulation and Modeling Methodologies, Technologies and Applications, SIMULTECH 2014

作者： Ören, Tuncer Yilmaz, Levent Ghasem-Aghaee, Nasser School of Electrical Eng. and Computer Science Univ. of Ottawa OttawaON Canada Computer Science and Software Engineering Samuel Ginn College of Engineering Auburn University AuburnAL United States Computer Eng. Dept. Sheikh Bahaei Univ. Baharestan Iran Univ. of Isfahan Isfahan Iran

ISBN: (纸本)9789897580383

Agent-supported simulation involves the use of intelligent agents to enhance modeling and simulation (M&S) infrastructures and consists of support by software agents: (1) to provide computer assistance for front-end and/or backend interface functions in M&S environments;(2) to process elements of an M&S study symbolically (for example, for consistency checks and built-in reliability);and (3) to provide cognitive abilities to the elements of an M&S study, such as perception, anticipation, learning or understanding abilities. Several aspects of agent-supported simulation are clarified and references are provided. © 2014 SciTePress. All rights reserved.

关键词： Intelligent agents

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Optimizing preemption-overhead accounting in multiprocessor real-time systems 14

Optimizing preemption-overhead accounting in multiprocessor ...

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22nd International Conference on Real-Time Networks and Systems, RTNS 2014

作者： Ward, Bryan C. Thekkilakattil, Abhilash Anderson, James H. Dept. of Computer Science University of North Carolina at Chapel Hill United States Div. of Software Engineering Mälardalen University Västerås Sweden

ISBN: (纸本)9781450327275

There exist two general techniques to account for preemption-related overheads on multiprocessors. This paper presents a new preemption-related overhead-accounting technique, called analytical redistribution of preemption overheads (ARPO), which integrates the two previous techniques to minimize preemption-overhead-related utilization loss. ARPO is applicable under any job-level fixed priority (JLFP) preemptive scheduler, as well as some limited-preemption schedulers. ARPO is evaluated in a new experimentaldesign framework for overhead-aware schedulability studies that addresses unrealistic simplifying assumptions made in previous studies, and is shown to improve real-time schedulability. Copyright © 2014 ACM.

关键词： Real time systems

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Effect of temporal collaboration network, maintenance activity, and experience on defect exposure 14

Effect of temporal collaboration network, maintenance activi...

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8th ACM/IEEE International Symposium on Empirical software engineering and Measurement, ESEM 2014

作者： Miranskyy, Andriy Caglayan, Bora Bener, Ayse Cialini, Enzo Dept. of Computer Science Ryerson University Canada Dept. of Mathematics Ryerson University Canada Dept. of Mechanical and Industrial Engineering Ryerson University Canada IBM Toronto Software Laboratory India

ISBN: (纸本)9781450327749

Context: Number of defects fixed in a given month is used as an input for several project management decisions such as release time, maintenance effort estimation and software quality assessment. Past activity of developers and testers may help us understand the future number of reported defects. Goal: To find a simple and easy to implement solution, predicting defect exposure. Method: We propose a temporal collaboration network model that uses the history of collaboration among developers, testers, and other issue originators to estimate the defect exposure for the next month. Results: Our empirical results show that temporal collaboration model could be used to predict the number of exposed defects in the next month with R2 values of 0.73. We also show that temporality gives a more realistic picture of collaboration network compared to a static one. Conclusions: We believe that our novel approach may be used to better plan for the upcoming releases, helping managers to make evidence based decisions. © 2014 Authors.

关键词： Project management

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Towards energy-aware optimisation of business processes

Towards energy-aware optimisation of business processes

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3rd International Conference on Smart Grids and Green IT Systems, SMARTGREENS 2014

作者： López, Beatriz Ghose, Aditya Savarimuthu, Tony Nowostawski, Mariusz Winikoff, Michael Cranefield, Stephen EXiT research group University of Girona Girona Spain School of Computer Science and Software Engineering University of Wollongong Wollongong Australia Dept. of Information Science University of Otago Dunedin New Zealand Faculty of Computer Science and Media Technology Gjøvik University College Gjøvik Norway

ISBN: (纸本)9789897580253

Time dependent energy tariffs are a matter of concern to managers in organisations, who need to rethink how to allocate resources to business processes so that they take into account energy costs. However, due to the time-dependent costs, the resource optimisation problem needs to be redesigned. In this paper we formalise the energy-aware resource allocation problem, including time-dependent variable costs;and present a case study in which an auction mechanism is used to find a solution. Our results show how the choice of cost (energy, monetary, or duration) affects the schedules obtained.

关键词： Constrained optimization

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