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检索条件"任意字段=Conference on High Performance Computer Modernization Program"

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Analysis of Max-Min Ant System with Local Search Applied to the Asymmetric and Dynamic Travelling Salesman Problem with Moving Vehicle 1

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conference on Analysis of Experimental Algorithms (SEA2)

作者： Schmitt, Joao P. Parpinelli, Rafael S. Baldo, Fabiano Santa Catarina State Univ UDESC Grad Program Appl Comp Joinville SC Brazil

ISBN: (数字)9783030340292

ISBN: (纸本)9783030340292;9783030340285

Vehicle routing problems require efficient computational solutions to reduce operational costs. Therefore, this paper presents a benchmark analysis of Max-Min Ant System (MMAS) combined with local search applied to the Asymmetric and Dynamic Travelling Salesman Problem with Moving Vehicle (ADTSPMV). Different from the well known ADTSP, in the moving vehicle scenario the optimization algorithm continues to improve the TSP solution while the vehicle is visiting the clients. The challenge of this scenario is mainly concerned with the fulfilment of hard time restrictions. In this study we evaluate how MMAS performs combined with US local search, 3-opt local search, and a memory mechanism. Besides that, we demonstrate how to model the moving vehicle restrictions under the MMAS algorithm. To perform the benchmark analysis instances from TSBLIB were selected. The dynamism was emulated by means of changes in traffic factors. The results indicate that for ADTSP the MMAS-US is the best algorithm while for ADTSPMV the MMAS-3opt is the most suitable.

关键词： Computational optimization Swarm intelligence Hybrid methods Dynamic problems

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Multi-view high dynamic range reconstruction via gain estimation 34

Multi-view high dynamic range reconstruction via gain estima...

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34th IEEE International conference on Visual Communications and Image Processing, VCIP 2019

作者： Abedi, Firas Liu, Qiong Yang, You Islamic University Computer Technical Engineering Department Najaf54001 Iraq Huazhong University of Science and Technology School of Electronic Information and Communications Wuhan430074 China

ISBN: (纸本)9781728137230

Multi-view high dynamic range reconstruction is a challenging problem, especially if the multi-view low dynamic range images are obtained from cameras arranged sparsely with limited shared view of vision among them. In this paper, we address the above challenge in addition to the back-lighting problem. We first enclose the geometry characteristic of the scene to rectify the outlier feature points. Consequently, an exposure gain is calculated according to those rectified features. After that, we extend the dynamic range for the multi-view low dynamic range images based on the estimated gain, then, generate a final high dynamic range image per view. Experimental results demonstrate superior performance for the proposed method over state-of-The-Art methods in both objective and subject comparisons. These results suggest that our method is suitable to improve the visual quality of multi-view low dynamic range images captured in low back-lighting conditions via commercial cameras sparsely located among each other. © 2019 IEEE.

关键词： Cameras

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GaN high-performance low-leakage p-Islet MPS diodes enabled by PAMBE-based selective area growth

GaN high-performance low-leakage p-Islet MPS diodes enabled ...

引用

2019 International conference on Compound Semiconductor Manufacturing Technology, CS MANTECH 2019

作者： Sarker, Palash Kelly, Frank Putnam Vesto, Riley Elis Ismail, Fawad Hassan Kim, Kyekyoon Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States

Two most widely used techniques to fabricate GaN p-n structures are: ion-implantation and ICP-RIE etching followed by regrowth. However, both the techniques inextricably suffer from higher leakage current due to defects and leakage paths created, while the latter introduces reduction in current density in the damaged areas. These high-defect yielding techniques can be avoided by using our PAMBE-SAG protocol developed earlier. In this paper we designed and successfully demonstrated the PI-MPS diode structures using the PAMBE-SAG methodology for the first time. © 2019 CS Mantech. All rights reserved.

关键词： Ion implantation

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Invited paper: Ai-based security design of mobile crowdsensing systems: review, challenges and case studies 13

Invited paper: Ai-based security design of mobile crowdsensi...

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13th IEEE International conference on Service-Oriented System Engineering, SOSE 2019, 10th International Workshop on Joint Cloud Computing, JCC 2019 and 2019 IEEE International Workshop on Cloud Computing in Robotic Systems, CCRS 2019

作者： Zhang, Yueqian Kantarci, Burak School of Electrical Engineering and Computer Science University of Ottawa OttawaON Canada

ISBN: (数字)9781728114422

ISBN: (纸本)9781728114415

Mobile crowdsensing (MCS) is a distributed sensing paradigm that uses a variety of built-in sensors in smart mobile devices to enable ubiquitous acquisition of sensory data from surroundings. However, non-dedicated nature of MCS results in vulnerabilities in the presence of malicious participants to compromise the availability of the MCS components, particularly the servers and participants' devices. In this paper, we focus on Denial of Service attacks in MCS where malicious participants submit illegitimate task requests to the MCS platform to keep MCS servers busy while having sensing devices expend energy needlessly. After reviewing Artificial Intelligence-based security solutions for MCS systems, we focus on a typical location-based and energy-oriented DoS attack, and present a security solution that applies ensemble techniques in machine learning to identify illegitimate tasks and prevent personal devices from pointless energy consumption so as to improve the availability of the whole system. Through simulations, we show that ensemble techniques are capable of identifying illegitimate and legitimate tasks while gradient boosting appears to be a preferable solution with an AUC performance higher than 0.88 in the precision-recall curve. We also investigate the impact of environmental settings on the detection performance so as to provide a clearer understanding of the model. Our performance results show that MCS task legitimacy decisions with high F-scores are possible for both illegitimate and legitimate tasks. © 2019 IEEE.

关键词： Denial-of-service attack

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Polystore++: Accelerated polystore system for heterogeneous workloads 39

Polystore++: Accelerated polystore system for heterogeneous ...

引用

39th IEEE International conference on Distributed Computing Systems, ICDCS 2019

作者： Singhal, Rekha Zhang, Nathan Nardi, Luigi Shahbaz, Muhammad Olukotun, Kunle Department of Computer Science Stanford University United States Stanford University and A Senior Scientist Tata Consultancy Services India

ISBN: (纸本)9781728125190

Modern real-time business analytic consist of heterogeneous workloads (e.g., database queries, graph processing, and machine learning). These analytic applications need programming environments that can capture all aspects of the constituent workloads (including data models they work on and movement of data across processing engines). Polystore systems suit such applications;however, these systems currently execute on CPUs and the slowdown of Moore's Law means they cannot meet the performance and efficiency requirements of modern workloads. We envision Polystore++, an architecture to accelerate existing polystore systems using hardware accelerators (e.g., FPGAs, CGRAs, and GPUs). Polystore++ systems can achieve high performance at low power by identifying and offloading components of a polystore system that are amenable to acceleration using specialized hardware. Building a Polystore++ system is challenging and introduces new research problems motivated by the use of hardware accelerators (e.g., optimizing and mapping query plans across heterogeneous computing units and exploiting hardware pipelining and parallelism to improve performance). In this paper, we discuss these challenges in detail and list possible approaches to address these problems. © 2019 IEEE.

关键词： program processors

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high performance DDoS Attack Detection System Based on Distribution Statistics 16th

High Performance DDoS Attack Detection System Based on Distr...

引用

16th IFIP WG 10.3 International conference on Network and Parallel Computing, NPC 2019

作者： Xie, Xia Li, Jinpeng Hu, Xiaoyang Jin, Hai Chen, Hanhua Ma, Xiaojing Huang, Hong National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9783030307080

Nowadays, web servers often face the threat of distributed denial of service attacks and their intrusion prevention systems cannot detect those attacks effectively. Many existing intrusion prevention systems detect attacks by the state of per-flow and current processing speed cannot fulfill the requirements of real-time detection due to the high speed traffic. In this paper, we propose a powerful system TreeSketchShield which can improve sketch data structure and detect attacks quickly. First, we discuss a novel structure TreeSketch to obtain statistics of network flow, which utilizes the stepped structure of binary tree to map the distribution and reduces the complexity of the statistic calculation. Second, we present a two-level detection scheme that could make a compromise between the detection speed and detection accuracy. Experimental results show that our method can process more than 100,000 records per second. The false alarm rate can achieve 2% to 25% performance improvement. © 2019, IFIP International Federation for Information Processing.

关键词： Binary trees

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high-efficiency Fresnel lens design and fabrication in a two-stage photopolymer 6

High-efficiency Fresnel lens design and fabrication in a two...

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conference on Holography - Advances and Modern Trends VI

作者： Hergert, John E. Glugla, David J. Sullivan, Amy C. Alim, Marvin D. McLeod, Robert R. Univ Colorado Mat Sci & Engn Program 027 UCB Boulder CO 80303 USA Univ Colorado Elect Comp & Energy Engn Dept 425 UCB Boulder CO 80309 USA

Diffractive optical elements (DOEs) assimilate optical functionality within thin ( 0.01. Another factor enabling high diffraction efficiency is the pixel count of the recording exposure. Thus, we use a photolithograph... 详细信息

ISBN: (数字)9781510627277

ISBN: (纸本)9781510627277

Diffractive optical elements (DOEs) assimilate optical functionality within thin (<= 100 mu m), lightweight films. With the recent advent of high dynamic range two-stage photopolymers, gradient-index volume DOEs can now achieve diffraction efficiencies competitive with conventional surface-relief DOEs, while also offering the advantages of contact-free, self-processing optical recording into a flat film that can be laminated between protective sheets. Here we design and fabricate Fresnel lenses with what we believe to be the highest reported diffraction efficiencies achieved to date using this gradient-index DOE approach. Our analysis demonstrates that these high diffraction efficiencies are crucially enabled by the high index modulation of the photopolymer, Delta n > 0.01. Another factor enabling high diffraction efficiency is the pixel count of the recording exposure. Thus, we use a photolithographic chrome mask with 9000 x 9000 pixels of 2.5 mu m diameter, significantly exceeding the pixel count available from spatial light modulators. The mask is imaged onto photopolymer films of 50 mu m thickness, and Fresnel patterns of up to 23 mm diameter are recorded in one-shot exposures. The resulting lenses range from f/44 -f/79 with diffraction efficiencies up to 83%. The performance of various lens designs is validated by an analysis showing that, for a given Delta n, there is a fundamental trade-off between low f/# and high diffraction efficiency. This high performance represents an important step toward practical applications, ranging through solar energy concentrators, customized vision optics, integrated photonics, heads-up displays, and hybrid lenses.

关键词： Diffractive Optical Element Fresnel Lens Holographic Photopolymer computer Generated Hologram

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A Time Domain Estimation Algorithm for Speech Signal Pitch Period

A Time Domain Estimation Algorithm for Speech Signal Pitch P...

引用

2019 International conference on Artificial Intelligence Technologies and Applications, ICAITA 2019

作者： Wu, Shuxing Li, Tiansong Zhang, Xiuqin School of Computer and Communication Beijing Information Technology College Beijing100015 China School of Information and Communication Guilin University of Electronic Technology Guilin Guangxi541004 China

In speech recognition and speech synthesis, accurate estimation of the pitch period is an important part of speech processing. The traditional direct peak estimation method and the autocorrelation function method are both effective time domain estimation algorithms. The autocorrelation method is a pitch period estimation algorithm suitable for low SNR. Both algorithms need to get accurate peak position estimation. In this paper, a multi-line cut method which is a method for judging the position of the peak point is proposed. The multi-line cut method is used to intercept the sampled data of the waveform by using multiple cut lines. The median value is calculated by the starting and ending points of the cut line position, and the peak position is indirectly evaluated. By minimizing the impact of interference on the peak estimate, the likelihood of falling into local extreme points is reduced, therefore a more accurate peak point estimate than the direct search for peak points can be obtained. The simulation results show that compared with the traditional direct peak estimation method, the performance of peak estimation by the multi-line cut method can be greatly improved, and the multi-line cut method can be used to estimate the peak value in the autocorrelation method, and also achieve a certain performance improvement. In addition, the number of cut lines is directly related to performance, and the more the number is, the better the performance is. The complexity of this method is not high and easy to implement. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Autocorrelation

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Semantic Textual Similarity and Factorization Machine Model for Retrieval of Question-Answering 3rd

Semantic Textual Similarity and Factorization Machine Model ...

引用

3rd International conference on Advances in Computing and Data Sciences, ICACDS 2019

作者： Limbasiya, Nivid Agrawal, Prateek Department of Computer Science and Engineering Lovely Professional University JalandharPunjab India

ISBN: (纸本)9789811399411

Question and Answering (QA) in many collaborative social networks such as Yahoo!-answers, Stack Overflow have attracted copious users to post and transfer knowledge between users. This paper proposes an Adaptive global T-max Long Short-Term Memory-Convolutional Neural Network (ALSTM-CNN) method to retrieve semantically matching questions from historical questions and forecast the best answers by saving their effort and time. Moreover, a novel Field-aware Factorization Machine (FFM) classifier is adapted to rank the high-quality answers from large sparse data. This method has certain advantages include: (a) effectively learns the similarity based on simple pertained models with various multiple dimensions, (b) does not uses handcrafted features. This algorithm shows robust performance for various tasks (i.e., measuring textual similarity and paraphrase identification), when it employs on datasets such as Semantic Textual Similarity (STS) benchmark, Sentence Involving Compositional Knowledge (SICK), Microsoft Research Paraphrase Corpus (MRPC) and Wikipedia Question Answer dataset. The performance of our proposed method is compared with different classifiers and the result shows a better accuracy measure than other state-of-the-art methods. © 2019, Springer Nature Singapore Pte Ltd.

关键词： Long short-term memory

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Comprehensive high Impedance Fault Model for Real-Time Environment 45

Comprehensive High Impedance Fault Model for Real-Time Envir...

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45th Annual conference of the IEEE Industrial Electronics Society, IECON 2019

作者： Wontroba, Aldair De Morais, Adriano Peres Rossini, Jean Pereira Gallas, Mairon Cardoso, Ghendy Vieira, Joao Paulo Abreu Santos, Marcelo Costa Farias, Patrick Escalante Federal University of Santa Maria Santa Maria RS Brazil Federal University of Pará Electrical Engineering Graduate Program Belém PA Brazil CELPA -Electric Distribution Utility of Pará Distribution System Operation Management Belém PA Brazil Federal Institute of Education Science and Technology of Rio Grande Do sul IFRS Farroupilha Brazil

ISBN: (纸本)9781728148786

This paper presents a comprehensive high impedance fault model for real-time environment. This model offers different types of ground surface and high impedance faults. Experimental results show that it is suitable for relays and algorithms commissioning in closed loop environment. The model is incorporated into OPAL-RT simulator and implemented in Hypersim software. Finally, the performance of the model is validated under a real case of high impedance fault by comparison with real-time simulation. © 2019 IEEE.

关键词： computer software

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