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Optimal Cooperative Relay Beamforming for Interference Minimization

Optimal Cooperative Relay Beamforming for Interference Minim...

引用

IEEE International Conference on Communications

作者： Ali Ramezani-Kebrya Min Dong Ben Liang Gary Boudreau Ronald Casselman Dept. of Electrical and Computer Engineering University of Toronto Dept. of Electrical Computer and Software Engineering University of Ontario Institute of Technology Ericsson Canada

ISBN: (纸本)9781467364300

We consider a wireless cellular network with multiple amplify-and-forward (AF) relays in each cell, assisting the communication of multiple source-destination pairs with relay transmission beamforming. Our objective is to minimize the maximum interference power among all active receivers in a neighboring cell subject to per-relay power and minimum received SNR constraints. We propose an efficient algorithm to obtain the optimal relay beamforming vectors. We show that even though the optimization problem is non-convex, it has zero Lagrange duality gap and can be converted to a semi-definite programming problem. The performance of the proposed algorithm is studied numerically, both for the case where the interference channel information is exactly known and for the case of inaccurate channel information due to either limited feedback or channel estimation error. It is demonstrated that the min-max interference approach substantially outperforms the alternative where we simply minimize the maximum relay transmission power.

关键词： Interference Relays Signal to noise ratio Array signal processing Channel estimation Wireless communication Optimization

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A semidefinite relaxation approach to mobile cloud offloading with computing access point

A semidefinite relaxation approach to mobile cloud offloadin...

引用

IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

作者： Meng-Hsi Chen Ben Liang Min Dong Dept. of Electrical and Computer Engineering University of Toronto Canada Dept. of Electrical Computer and Software Engineering University of Ontario Institute of Technology Canada

We consider a mobile cloud computing scenario consisting of one user with multiple independent tasks, one computing access point (CAP), and one remote cloud server. The CAP can either process the received tasks from the mobile user or offload them to the cloud, providing additional computation capability over traditional mobile cloud computing systems. We aim to optimize the offloading decision of the user to minimize the overall cost of energy, computation, and delay. It is shown that the problem can be formulated as a non-convex quadratically constrained quadratic program, which is NP-hard in general. We propose an efficient offloading decision algorithm by semidefinite relaxation and a novel randomization mapping method. Our simulation results show that the proposed algorithm gives nearly optimal performance with only a small number of randomization iterations, and adding CAPs to the traditional dichotomy of mobile devices and remote cloud servers can drastically improve mobile cloud computing performance.

关键词： Mobile communication Delays Servers Optimization Cloud computing Wireless communication Mobile handsets

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Patient safety & clinical decision support systems (CDSS): A case study in Turkey

Patient safety & clinical decision support systems (CDSS): A...

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E-Health and Bioengineering Conference (EHB)

作者： Gonca Gokce Menekse Nergiz Ercil Cagiltay Gul Tokdemir Software Engineering Dept. Atilim University Ankara Turkey Computer Engineering Dept. Cankaya University Ankara Turkey

ISBN: (纸本)9781467375467

Decision making process is crucial in several stages of clinical procedures. On the other hand, there are not many studies showing the implications of decision support systems in clinical environments. Hence, adaptation of Decision Support Systems to clinical environment is getting more important as we can collect more data through sensors and yet cannot use it effectively in decision making process. This study aims to understand the effects, benefits and obstacles utilizing CDSS in healthcare. For this purpose, 60 CDSS studies were analyzed to better understand their purpose, implementation domain, and success degrees in the world. Also, a case study was made for analyzing the situation in Turkey. The results show that in the field of neurosurgery, the level of analysis of neurosurgical data in Turkey is very low. The results show an urgent need for collaboration of IT experts and medical authorities to better record and analyze clinical data in the field of neurosurgery.

关键词： Medical diagnostic imaging Training Decision making Decision support systems Diseases Neurosurgery

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Malicious behavior pattern mining using Control Flow Graph

Malicious behavior pattern mining using Control Flow Graph

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Research in Adaptive and Convergent Systems, RACS 2015

作者： Choi, Chang Piao, Xuefeng Choi, Junho Lee, Mungyu Kim, Pankoo Department of Computer Engineering Chosun University Gwangju Korea Republic of School of Computer Science and Technology Harbin Institute of Technology China Division of Undeclared Majors Chosun University Gwangju Korea Republic of Dept. of Software Convergence Engineering Chosun University Gwangju Korea Republic of

ISBN: (纸本)9781450337380

Cyber hacking attacks based on malicious code are becoming diversified. Malicious code analysis is very important because static flow analysis can naturally be helpful as part of the detection process given that malicious codes can affect the data and control flow of a program. This paper introduces the representation method of the Control Flow Graph based on malicious codes. Our proposed method can detect well-known malicious codes and their variants. In addition, the proposed method shows a new response method through the conceptual approach method of source codes. © 2015 ACM.

关键词： Graphic methods

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Optimal power allocation in device-to-device communication with SIMO uplink beamforming

Optimal power allocation in device-to-device communication w...

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IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

作者： Ali Ramezani-Kebrya Min Dong Ben Liang Gary Boudreau S. Hossein Seyedmehdi Dept. of Electrical and Computer Engineering University of Toronto Canada Dept. of Electrical Computer and Software Engineering Institute of Technology Canada Ericsson Canada Canada

Cellular and device-to-device (D2D) communication may cause significant inter-cell interference (ICI) at a neighboring base station (BS). In this work, we aim to maximize the sum rate of a cellular user (CU) and a D2D pair, with receive beamforming at the BS equipped with multiple antennas, subject to per-node power, maximum ICI, and minimum SINR constraints. We propose an efficient algorithm to maximize the sum rate in two steps. We first consider the D2D admissibility problem to determine whether the D2D pair can share the spectrum with the CU while satisfying all the constraints and SINR requirements. We then obtain the optimal beam vector and the optimal power levels of the CU and D2D transmitters in closed form. The performance of the proposed algorithm is studied numerically. It is shown the proposed optimal solution substantially outperforms a CU-priority heuristic approach that selects the maximum CU power with minimum D2D interference.

关键词： Interference Signal to noise ratio Resource management Uplink Transmitters Conferences

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ClusterFetch: A lightweight prefetcher for general workloads 15

ClusterFetch: A lightweight prefetcher for general workloads

引用

6th ACM/SPEC International Conference on Performance engineering, ICPE 2015

作者： Jeong, Haksu Ryu, Junhee Lee, Dongeun Lee, Jaemyoun Shin, Heonshik Kang, Kyungtae Software R and D Center Samsung Electronics Suwon443-742 Korea Republic of Networks Business Samsung Electronics Suwon443-742 Korea Republic of School of Electrical and Computer Engineering UNIST Ulsan689-798 Korea Republic of Dept. Computer Science and Engineering Hanyang University Ansan426-791 Korea Republic of Dept. Computer Science and Engineering Seoul National University Seoul151-744 Korea Republic of

ISBN: (纸本)9781450332484

Application loading times can be reduced by prefetching disk blocks into the buffer cache. Existing prefetching schemes for general workloads suffer from significant overheads and low accuracy. ClusterFetch is a lightweight prefetcher that identifies continuous sequences of I/O requests and identifies the files that trigger them. The next time that the same files are opened, the corresponding disk blocks are prefetched. In experiments, ClusterFetch reduced the launch time, by which we refer to the latency that occurs when a programfirst runs, by 15.2 to 30.9%, and loading times, meaning the delays that are incurred while additional data is loaded from the disk during program execution, by 15.9%. Copyright © 2015 ACM.

关键词： Loading

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Cracking Down MapReduce Failure Amplification through Analytics Logging and Migration

Cracking Down MapReduce Failure Amplification through Analyt...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Yandong Wang Huansong Fu Weikuan Yu Dept. of Computer Science and Software Engineering Auburn University Auburn AL USA

ISBN: (纸本)9781479986507

MapReduce is popular for big data analytics because it offers easy-to-use map and reduce user interfaces while hiding the complexity of system scalability and fault resiliency issues. While a large body of literature has focused on improving the performance and scalability of MapReduce, the issue of fault resiliency has thus far received little attention. In this paper, we take on an effort to investigate the fault resiliency of MapReduce using YARN (the next-generation Hadoop) as a case study. We reveal that the failures of a MapTask, a ReduceTask or a compute node can cause distinctly different impact to MapReduce programs. Particularly, YARN MapReduce is not able to gracefully handle failures that involve ReduceTasks, causing prolonged task execution, delayed job completion, and, more severely, failure amplifications due to the cascading effects to other tasks. These problems together cause the performance collapse of MapReduce jobs. In this paper, we introduce a new fault-tolerant framework that can crack down failure amplification and gracefully handle failure scenarios. It is designed with two key fault handling techniques: analytics logging and speculative fast migration. Analytics logging is a light-weight mechanism that logs the key progress information of MapReduce tasks, speculative fast migration handles node failures by proactively re-executing MapTasks, migrating ReduceTasks, and collective merging with a pipeline of shuffle/merge and reduce stages. Our performance evaluation demonstrates that these techniques can eliminate failure amplification and deliver fast job execution compared to the existing task re-execution mechanism in MapReduce.

关键词： Merging Yarn computer crashes Scheduling Scalability Delays Power system faults

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Analysis of scale variations of local features for accurate classification of Emphysema images

Analysis of scale variations of local features for accurate ...

引用

International Conference on BioMedical engineering and Informatics (BMEI)

作者： Musibau A. Ibrahim Ramakrishnan Mukundan Dept. of Computer Science and Software Engineering University of Canterbury Christchurch New Zealand

The effectiveness of local or global features has recently attracted growing attention in the field of texture image classification and retrieval. The features of the local binary pattern (LBP) for instance, usually lack global spatial information while global descriptors would provide very little local information. This paper proposes two different descriptors to circumvent these shortcomings by providing more information to describe different textural structures of the Emphysema computed tomography (CT) images. The proposed LBP+Multi-fractal Images (LMI) and the rotational invariant LBP+Multi-fractal Images (RLMI) can provide more accurate classification results by using a hybrid concatenation of the local and global features. The experimental approaches are validated for different scales of Emphysema images during the classification process in order to determine the appropriate image size that could yield the maximum classification accuracy. The experimental results show that the descriptors extracted from the combined features considerably improve the performance of the classifiers. The results also indicate that the LMI descriptor outperforms the earlier approaches and demonstrate the discriminating power and robustness of the combined features for accurate classification of Emphysema CT images.

关键词： Fractals Feature extraction Histograms Digital images Principal component analysis Computed tomography Robustness

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User-centric Monitoring of Sensitive Information Access in Android Applications

User-centric Monitoring of Sensitive Information Access in A...

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International Conference on Mobile software engineering and Systems (MOBILESoft)

作者： Roshanak Roshandel Robert Tyler Dept. of Computer Science and Software Engineering Seattle University Seattle WA USA

Mobile applications (apps) have access to a large volume of sensitive user information. Current mobile platforms such as Android do not provide a means for the user to quantitatively understand the nature of access to their sensitive data by apps. In this paper, we present our approach to profile app's access to user's data with the ultimate goal of developing a personal privacy threshold for users and privacy index for apps.

关键词： Hidden Markov models Mobile communication Monitoring Androids Humanoid robots Privacy Data privacy

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Web application prototype: State-of-art survey evaluation

Web application prototype: State-of-art survey evaluation

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National software engineering Conference (NSEC)

作者： Mehreen Ahmed Mahum Adil Seemab Latif Dept. of Computer Software Engineering National University of Sciences and Technology Islamabad Pakistan

Human computer Interactivity plays a vital role in a web application's success. A survey evaluation was undertaken of a web application prototype named "My Portfolio", directed towards the students of different universities. The aim of the survey was to find the shortcomings in the interface design, whether it followed the design principles and if the web application is user-friendly. A questionnaire, consisting of 16 questions was distributed among the students. The questions were made after studying some basic Human computer Interaction design principles. The overall assessment of the web application was very positive and some evaluators mentioned that they liked the simplicity and color scheme of the application. We summarize the findings of our study and discuss the issues that need to be resolved in the next prototype.

关键词： Color Usability Portfolios Prototypes Human computer interaction computers

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