Cryptology

MODELING, MONITORING AND SCHEDULING TECHNIQUES FOR NETWORK RECOVERY FROM MASSIVE FAILURES

2018-11-21T10:07:00.001-08:00

MODELING, MONITORING AND SCHEDULING TECHNIQUES FOR NETWORK RECOVERY FROM MASSIVE FAILURES

Author:

Zad Tootaghaj, Diman

Graduate Program:

Computer Science and Engineering

Degree:

Doctor of Philosophy

Document Type:

Dissertation

Date of Defense:

May 23, 2018

Committee Members:

Thomas F Laporta, Dissertation Advisor
Thomas F Laporta, Committee Chair
Ting He, Committee Member
Nilanjan Ray Chaudhuri, Committee Member
Marek Flaska, Outside Member

Keywords:

Network Recovery
Massive Disruption
Stochastic Optimization
Uncertainty
Network Recovery Massive Disruption
Uncertainty.
Cascading Failures
Interdependent Networks
Power Grid
Software-Defined Networking

Abstract:

This dissertation explores modeling, monitoring and scheduling techniques for network recovery from massive failures, with a focus on optimization methods under uncertain knowledge of failures. Large-scale failures in communication networks due to natural disasters or malicious attacks can severely affect critical communications and threaten lives of people in the affected area. In 2005, Hurricane Katrina led to outage of over 2.5 million lines in the BellSouth (now AT&T) network. In the absence of a proper communication infrastructure, rescue operation becomes extremely difficult. Progressive and timely network recovery is, therefore, a key to minimizing losses and facilitating rescue missions. Many prior works on failure detection and recovery assume full knowledge of failures and use a deterministic approach for the recovery phase. In real-world scenarios, however, the failure pattern might be unknown or only partially known. Therefore, classic recovery approaches may not work. To this end, I focus on network recovery assuming partial and uncertain knowledge of the failure locations. I first studied large-scale failures in a communication network. In particular, I proposed a new recovery approach under uncertain knowledge of failures. I proposed a progressive multi-stage recovery approach that uses the incomplete knowledge of failure to find a feasible recovery schedule. From the elements of this solution, I selected a node with highest centrality at each iteration step to repair and exploit as a monitor to increase the knowledge of network state, until all critical services are restored. The recovery problem can be addressed by giving different priority to three performance aspects including: 1) Demand loss, 2) computation time and 3) number of repairs (or repair cost). These aspects are in conflict with each other and I studied the trade-off among them. Next, I focused on failure recovery of multiple interconnected networks. In particular, I focused on the interaction between a power grid and a communication network. I modeled the cascading failures in a power gird using a DC power flow model. I tackled the problem of mitigating an ongoing cascade by formulating the minimum cost flow assignment problem as a linear programming optimization. The optimization aimed at finding a minimum cost DC power flow setting that stops the cascading failure, where the total cost is defined as the total weighted amount of unsatisfied load due to the re-distribution of the power in the generators and loads without violating the overload constraint at each line. Then, I focused on network monitoring techniques that can be used for diagnosing the performance of individual links for localizing soft failures (e.g. highly congested links) in a communication network. I studied the optimal selection of the monitoring paths to balance identifiability and probing cost. I considered four closely related optimization problems: (1) Max-IL-Cost that maximizes the number of identifiable links under a probing budget, (2) Max-Rank-Cost that maximizes the rank of selected paths under a probing budget, (3) Min-Cost-IL that minimizes the probing cost while preserving identifiability, and (4) Min-Cost-Rank that minimizes the probing cost while preserving rank. I showed that while (1) and (3) are hard to solve, (2) and (4) possess desirable properties that allow efficient computation, while providing good approximation to (1) and (3). I proposed an optimal greedy-based approach for (4) and proposed a (1-1/e)-approximation algorithm for (2). My experimental analysis revealed that, compared to several greedy approaches that directly solve the identifiability-based optimization (i.e. (1) and (3)), the proposed rank-based optimization (i.e. (2) and (4)) achieved better trade-offs in terms of identifiability and probing cost. Finally, I addressed, a minimum disruptive routing framework in software defined networks. I showed that flow disruption, congestion and violation of policies can occur during updates of flow tables in software defined networks. I aimed to minimize the update disruption and minimize the number of affected flows during the update, while taking into account link capacity constraints and the importance of various flows to upper-layer applications. I formulated the problem as an integer linear programming and showed that it is NP-Hard. I proposed two randomized rounding algorithms with bounded congestion and demand loss to solve this problem. In addition to a small SDN testbed, I performed a large-scale simulation study to evaluate my proposed approaches on real network topologies. Extensive experimental and simulation results show that the two random rounding approaches have a disruption cost close to the optimal while incurring a low congestion factor and a low demand loss.

New trend in Computational Photography

2018-11-15T13:06:00.001-08:00

CAPTAIN: Comprehensive Composition Assistance for Photo Taking

Auction-based Resource Management in Computer Architecture
Professional portrait dataset
Enhanced Signal Recovery via Sparsity Inducing Image Priors

Sites.Google.Com

2017-11-08T13:32:00.001-08:00

Behavioral Analog Topology Synthesizerطراحی کننده توپولوژي مدارهاي آنالوگ درحوزه سيگنال كوچك و فركانس پايينhttps://sites.google.com/site/netlist2scheme/
Cool Teen Buddy
https://sites.google.com/site/coolteenbuddy/
Diman Zad-Tootaghaj 's Academic WebsiteDiman Zad-Tootaghaj 's Academic Website سایت گوگل دیمن زاد توت آغاجhttps://sites.google.com/site/dimantootaghaj/
Eigenvalues-based Steganalysis
https://sites.google.com/site/eigenvaluesbasedsteganalysis/
FARHATفرحتhttps://sites.google.com/site/farhat83site/
Farsheed FarhatFarshiid Farsheed Farshead Farshied Farsheid Farshyd فرشید فرشيد فرحت فرهت فرحط فرهطhttps://sites.google.com/site/farsheed83/
Farshid Farhat 's Google-Pageصفحه گوگل فرشيد فرحتhttps://sites.google.com/site/farshidfarhat2/
Farshid Farhat 's Google-SiteYou will find the links to other resources related to Farshid Farhathttps://sites.google.com/site/farshidfarhat/
frash downloads
https://sites.google.com/site/frashdownloads/
frashpix
https://sites.google.com/site/frashpix/
Game Theoretic Network SimulatorGame Theory Network Simulator Game Strategies in Network Security Simulation by Visual C++https://sites.google.com/site/gametheoreticnetworksimulator/
Multi-Dimensional Correlated SteganalysisMulti-Dimensional Correlated Steganalysis (MDCS) Multi-Dimensional Correlation (MDC) Steganalysis by Dimensional Cross Correlationhttps://sites.google.com/site/mdimcorrsteganalysis/
Optical CDMA Network Simulator
https://sites.google.com/site/opticalcdmanetworksimulator/
Sharif Students 79دانشجویان شریف ورودی سال 1379https://sites.google.com/site/sharifstudents79/
Sharif Students Servicesسرویس های فن آوری اطلاعات توسط دانشجویان شریفhttps://sites.google.com/site/sharifstudentsservices/
Student Branch of Iranian Society of CryptologyStudent Branch of Iranian Society of Cryptology at Sharif University of Technologyhttps://sites.google.com/site/sbisc4sharif/
Wireless Mobile Adhoc Network Simulatorشبیه ساز شبکه ادهاکhttps://sites.google.com/site/wmanetsecsim/
آموزشگاه موسیقی نوای سه گاهآدرس: تهران، نارمک، بالاتر از میدان هفت حوض، ضلع شمال شرقی چهارراه سرسبز، جنب موسسه ملی زبان (دختران)، ساختمان عتیق، پلاک 11. تلفن: 77805234-021https://sites.google.com/site/navayesegah/
سایت گوگل فرشيد فرحتسایت گوگل فرشيد فرحتhttps://sites.google.com/site/farshid83site/
شاخه دانشجویي انجمن رمز ایران در دانشگاه صنعتی شریفشاخه دانشجوئی انجمن رمز ایران در دانشگاه صنعتی شریفhttps://sites.google.com/site/sbisc4sut/
فراامنیتمدیریت حل سیستم فراتر از امنیتhttps://sites.google.com/site/xtra4security/

SITES.PSU.EDU

2017-11-02T13:01:00.001-07:00

Behavioral Analog Topology Synthesizer
Optical CDMA Network Simulator (OCNS)
Persian Boy Names
Persian Girl Names
Extended Authentication and Key Agreement Protocol
Secure Multipath Adaptive Routing Protocol
Authentication and Key Agreement Protocol in 4G
Risk of attack coefficient effect on availability of adhoc networks
Game-theoretic model to mitigate packet dropping
Multi-dimensional correlation steganalysis
SVD and Noise Estimation based Image Steganalysis
Eigenvalues-based LSB steganalysis
Security Weaknesses in PGP Protocol
Performance Modeling and Optimization of MapReduce
Image Steganalysis of Low Rate Embedding in Spatial Domain
Modeling and Optimization of Straggling Mappers
Blind detection of low-rate embedding
Big Data Computing: Modeling and Optimization
Towards Stochastically Optimizing Data Computing Flows
Optimal Placement in Network On-Chip
Optimal Scheduling in Parallel Programming Frameworks
Node Architecture and Cloud Workload Characteristics Analysis
Thumbnail Generation by Smart Cropping
Stochastic Modeling and Optimization of Stragglers
Chinese Academy of Sciences
Vanishing Point Detection in Photo Composition Analysis
Aesthetic Rating for Photos
Shape matching for automated bow echo detection
Detecting Dominant Vanishing Points in Natural Scenes
Skeleton Matching for Severe Weather Detection
Discovering Triangles in Portraits and Landscapes
Leveraging big visual data to predict severe weather
IAAP Scholarship Award
Deep-learned Models and Photography Idea Retrieval
Maryam Mirzakhani, the mother who won Fields Medal
Calculate AT&T Shares in a Shared Data Plan
Travel Grant from CSE Department
CAGE: A Contention-Aware Game-theoretic Model for Heterogeneous Resource Assignment

System and methods for UICC-based secure communication

2017-10-20T08:14:00.001-07:00

System and methods for UICC-based secure communication US 9461993 B2
System and methods for uicc-based secure communication US 20150222631 A1

ABSTRACT
A system that incorporates the subject disclosure may include, for example, instructions which when executed cause a device processor to perform operations comprising sending a service request to a remote management server; receiving from the management server an authentication management function and an encryption key generator for execution by a secure element and an encryption engine for execution by a secure device processor, sending a request to establish a communication session with a remote device; and communicating with the remote device via a channel established using an application server. The secure element and the secure device processor authenticate each other using a mutual authentication keyset. The secure element, the secure device processor and the device processor each have a security level associated therewith; the security level associated with the secure device processor is intermediate between that of the secure element and that of the device processor. Other embodiments are disclosed.

Reference
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System and methods for UICC-based secure communication
SYSTEM AND METHODS FOR UICC-BASED SECURE COMMUNICATION 20150222631

Aesthetic Rating for Images

2017-10-16T11:19:00.001-07:00

The developed engine gets the image and outputs a score showing the amount of the beauty inside the image! The code is also working on Android/iOS platform. The engine speed is good enough which makes it suitable for a real-time engine. The core computes aesthetic features from the image, and estimates the aesthetic score. Check out > ACQUINE

The contributors: Jia Li, James Wang, Farshid Farhat.

Computer Vision, Demo, Development, iOS, Research and tagged ACQUINE, Aesthetic Feature Extraction, Aesthetic Rating, Aesthetics Scoring, ALiPR, Android, CEO, CEOx2, GPU, Image Aesthetics, iOS, James Wang, Jia Li, Renderscript, Scoring Engine, Simplr

Contention-Aware Game-theoretic Model for Heterogeneous Resource Assignment

2017-10-10T12:46:00.001-07:00

CAGE: A Contention-Aware Game-theoretic Model for Heterogeneous Resource Assignment

Traditional resource management systems rely on a centralized approach to manage users running on each resource. The centralized resource management system is not scalable for large-scale servers as the number of users running on shared resources is increasing dramatically and the centralized manager may not have enough information about applications' need. In this paper we propose a distributed game-theoretic resource management approach using market auction mechanism to find optimal strategy in a resource competition game. The applications learn through repeated interactions to choose their action on choosing the shared resources. Specifically, we look into two case studies of cache competition game and main processor and co-processor congestion game. We enforce costs for each resource and derive bidding strategy. Accurate evaluation of the proposed approach show that our distributed allocation is scalable and outperforms the static and traditional approaches.
Draft > CAGE
Big Data, Conference Paper, Research Auction Theory, Biding Strategy, Computer Architecture, Contention Aware, Diman Tootaghaj, Distributed Resource Management, Game Theory, Resource Allocation, Resource Assignment, Resource Sharing on October 5, 2017.

Modeling and Optimization of MapReduce

2017-09-30T10:49:00.001-07:00

ABSTRACT

MapReduce framework is widely used to parallelize batch jobs since it exploits a high degree of multi-tasking to process them. However, it has been observed that when the number of mappers increases, the map phase can take much longer than expected. This paper analytically shows that stochastic behavior of mapper nodes has a negative effect on the completion time of a MapReduce job, and continuously increasing the number of mappers without accurate scheduling can degrade the overall performance. We analytically capture the effects of stragglers (delayed mappers) on the performance. Based on an observed delayed exponential distribution (DED) of the response time of mappers, we then model the map phase by means of hardware, system, and application parameters. Mean sojourn time (MST), the time needed to sync the completed map tasks at one reducer, is mathematically formulated. Following that, we optimize MST by finding the task inter-arrival time to each mapper node. The optimal mapping problem leads to an equilibrium property investigated for different types of inter-arrival and service time distributions in a heterogeneous datacenter (i.e., a datacenter with different types of nodes). Our experimental results show the performance and important parameters of the different types of schedulers targeting MapReduce applications. We also show that, in the case of mixed deterministic and stochastic schedulers, there is an optimal scheduler that can always achieve the lowest MST.

[Tech Report] [Master Thesis] [IEEE Trans]

Last version > MapReduce_Performance_Optimization

www.personal.psu.edu/fuf111

2017-09-27T15:51:00.001-07:00

Publications

Discovering Triangles in Portraits for Supporting Photographic Creation, S He, Z Zhou, F Farhat, JZ Wang, IEEE Transactions on Multimedia, Aug 2017.

Intelligent Portrait Composition Assistance — Integrating Deep-learned Models and Photography Idea Retrieval, F Farhat, MM Kamani, S Mishra, JZ Wang, July 2017.

Skeleton Matching with Applications in Severe Weather Detection, MM Kamani, F Farhat, S Wistar, JZ Wang, Applied Soft Computing, May 2017.

Detecting Dominant Vanishing Points in Natural Scenes with Application to Composition-Sensitive Image Retrieval, Z Zhou, F Farhat, JZ Wang, IEEE Transactions on Multimedia, May 2017.

Shape matching using skeleton context for automated bow echo detection, MM Kamani, F Farhat, S Wistar, JZ Wang, Big Data (Big Data), 2016 IEEE International Conference on, 901-908, Dec 2016.

Detecting Vanishing Points in Natural Scenes with Application in Photo Composition Analysis, Z Zhou, F Farhat, JZ Wang, arXiv preprint arXiv:1608.04267, 2016.

Optimal Placement of Cores, Caches and Memory Controllers in Network On-Chip, DZ Tootaghaj, F Farhat, arXiv preprint arXiv:1607.04298, 2016.

Towards Stochastically Optimizing Data Computing Flows, F Farhat, DZ Tootaghaj, M Arjomand, arXiv preprint arXiv:1607.04334, 2016.

Stochastic Modeling and Optimization of Stragglers, F Farhat, D Zad Tootaghaj, Y He, et al. IEEE Transaction on Cloud Computing, 2016.

Fork-Join Queue Modeling and Optimal Scheduling in Parallel Programming Frameworks, F Farhat, EECS Thesis, The Pennsylvania State University, 2015.

Evaluating the Combined Impact of Node Architecture and Cloud Workload Characteristics on Network Traffic and Performance/Cost, DZ Tootaghaj, F Farhat, M Arjomand, P Faraboschi et al. Workload characterization (IISWC), 2015 IEEE international symposium on, 203-212, 2015.

Towards blind detection of low-rate spatial embedding in image steganalysis, F Farhat, S Ghaemmaghami, IET Image Processing 9 (1), 31-42, 2015.

Modeling and optimization of straggling mappers, F Farhat, DZ Tootaghaj, A Sivasubramaniam, MT Kandemir, CR Das, Technical report, Technical Report CSE-14-006, Pennsylvania State University, 2014.

Security Weaknesses in PGP Protocol, F Farhat, M Heydari, MR Aref, 2013.

Eigenvalues-based LSB steganalysis, F Farhat, A Diyanat, S Ghaemmaghami, MR Aref, The ISC International Journal of Information Security 4 (2), 97-106, 2012.

Image steganalysis based on SVD and noise estimation: Improve sensitivity to spatial LSB embedding families, A Diyanat, F Farhat, S Ghaemmaghami, TENCON 2011-2011 IEEE Region 10 Conference, 1266-1270, 2011.

Multi-dimensional correlation steganalysis, F Farhat, A Diyanat, S Ghaemmaghami, MR Aref, Multimedia Signal Processing (MMSP), 2011 IEEE 13th International Workshop, 2011.

Game-theoretic approach to mitigate packet dropping in wireless Ad-hoc networks, DZ Tootaghaj, F Farhat, MR Pakravan, MR Aref, Consumer Communications and Networking Conference (CCNC), 2011 IEEE, 163-165, 2011.

Risk of attack coefficient effect on availability of Ad-hoc networks, DZ Tootaghaj, F Farhat, MR Pakravan, MR Aref, Consumer Communications and Networking Conference (CCNC), 2011 IEEE, 166-168, 2011.

Private Identification, Authentication and Key Agreement Protocol with Security Mode Setup, F Farhat, S Salimi, A Salahi, IACR Cryptology ePrint Archive, 2011.

Locally Multipath Adaptive Routing Protocol Resilient to Selfishness and Wormholes, F Farhat, MR Pakravan, M Salmasizadeh, MR Aref, International Conference on Information Security Practice and Experience, 2010.

An Extended Authentication and Key Agreement Protocol of UMTS, F Farhat, S Salimi, A Salahi, International Conference on Information Security Practice and Experience, 2009.

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PIAKAP

2017-09-22T07:51:00.001-07:00

Authentication and Key Agreement Protocol in 4G

Private Identification, Authentication and Key Agreement Protocol with Security Mode Setup, Farshid Farhat, Somayeh Salimi, Ahmad Salahi.

Abstract
Identification, authentication and key agreement protocol of UMTS networks with security mode setup has some weaknesses in the case of mutual freshness of key agreement, DoS-attack resistance, and efficient bandwidth consumption. In this article we consider UMTS AKA and some other proposed schemes. Then we explain the known weaknesses of the previous frameworks suggested for the UMTS AKA protocol. After that we propose a new protocol called private identification, authentication, and key agreement protocol (PIAKAP), for UMTS mobile network. Our suggested protocol combines identification and AKA stages of UMTS AKA protocol while eliminates disadvantages of related works and brings some new features to improve the UMTS AKA mechanism. These features consist of reducing the interactive rounds of the UMTS AKA with security mode setup and user privacy establishment.

ePrint, Research, Security and tagged Ahmad Salahi, Authentication, Identification, Key Agreement, Mobile Network, PIAKAP, Privacy, Security Protocol, Somayeh Salimi, UMTS on March 25, 2011.

Bid Data Analytics

2017-08-23T09:19:00.001-07:00

Advanced_Identity_Management_System_in_4-1emc0qt BRP_final-zoyyb5 Enhanced-Public-Key-Encryption-Algorithm-for-Security-of-Network-1fx6bcq Patent-1juoapk 829-2424-1-PB-291udlo 1705.08464-1tbevxv 1705.09073-2bike8d 108262-267778-1-PB-23ehcaw 07175726-2c3bror 07943366-1cqh172 p55-shi-pcen16

Penn State Sites

2017-08-17T08:04:00.001-07:00

Smart Cropping, Aesthetic Scoring, Image Retrieval and Deep Learning, Big Data Computing, Portrait Photography, Computer Vision and Pattern Recognition, Distributed and Parallel frameworks, Networking

Big Data Computing

Image Retrieval and Deep Learning

Deep Learning at Penn State

Smart Cropping, Aesthetic Scoring

Computer Vision and Pattern Recognition

Distributed and Parallel Systems, Network Security

ASSOCIATION AT PENNSYLVANIA STATE UNIVERSITY

Professional Photography using Deep Learning

2017-08-10T14:30:00.001-07:00

ABSTRACT: Retrieving photography ideas corresponding to a given location facilitates the usage of smart cameras, where there is a high interest among amateurs and enthusiasts to take astonishing photos at anytime and in any location. Existing research captures some aesthetic techniques such as the rule of thirds, triangle, and perspective-ness, and retrieves useful feedbacks based on one technique. However, they are restricted to a particular technique and the retrieved results have room to improve as they can be limited to the quality of the query. There is a lack of a holistic framework to capture important aspects of a given scene and give a novice photographer informative feedback to take a better shot in his/her photography adventure. This work proposes an intelligent framework of portrait composition using our deep-learned models and image retrieval methods. A highly-rated web-crawled portrait dataset is exploited for retrieval purposes. Our framework detects and extracts ingredients of a given scene representing as a correlated hierarchical model. It then matches extracted semantics with the dataset of aesthetically composed photos to investigate a ranked list of photography ideas, and gradually optimizes the human pose and other artistic aspects of the composed scene supposed to be captured. The conducted user study demonstrates that our approach is more helpful than the other constructed feedback retrieval systems.

Art, Computer Vision, Conference Paper, Deep Learning, Image Processing, Machine Learning, Pattern Recognition, Photography, Research, Thesis ACM Multimedia, ACMM, Aesthetics, AI, Art Theory, Artificial Intelligence, CBIR, Computer Vision, Content-based Image Retrieval, Deep Learning, Deep-Learned Model Transfer, Human Pose, Human Pose Estimation, Image Aesthetics, Image Processing, Image Retrieval, Intelligent Portrait Composition Assistance, IPCA, Machine Learning, Object Detection, Pattern Recognition, Penn State Deep Learning, Photography, Photography Idea, Portrait, Portrait Composition, Portrait Dataset, Portrait Photography, Pose Estimation, Pose Recommendation, Scene Parsing, Step-by-Step-Guide on July 2, 2017.

A Public Key Encryption Algorithm for Network Security

2017-07-30T09:24:00.001-07:00

Enhanced Public Key Encryption Algorithm for Security of Network

Abstract -- Network security has become more important to personal computer users, organizations, and the military. With the advent of the internet,

security became a major concern and the history of security allows a better understanding of the emergence of security technology. The internet

structure itself allowed for many security threats to occur. When the architecture of the internet is modified it can reduce the possible attacks that can be

sent across the network. Knowing the attack methods, allows for the appropriate security to emerge. By means of firewalls and encryption mechanisms

many businesses secure themselves from the internet. The businesses create an "intranet" to remain connected to the internet but secured from

possible threats. Data integrity is quite a issue in security and to maintain that integrity we tends to improve as to provides the better encryption

processes for security. In our proposed work we will make encryption harder with enhanced public key encryption protocol for security and will discuss

the applications for proposed work. We will enhance the hardness in security by improving the Diffie-Hellman encryption algorithm by making changes or

adding some more security codes in current algorithm.

REFERENCES

[1] Farhat, Farshid, Somayeh Salimi, and Ahmad Salahi. "Private

Identification, Authentication and Key Agreement Protocol with

Security Mode Setup." IACR Cryptology ePrint Archive 2011.

[2] Emmanuel Bresson, Olivier Chevassut, David

Pointcheva, Jean-Jacques Quisquater, "Authenticated

Group Diffie-Hellman Key Exchange", Computer and

Communication Security- proc of ACM CSS'01,

Philadelphia, Pennsylvania, USA, Pages 255-264, ACM Press,

November 5-8, 2001.

[3] Mario Cagaljm, Srdjan Capkun and Jean-Pierre

Hubaux," Key agreement in peer-to-peer wireless

networks", Ecole Polytechnique F´ed´erale de Lausanne

(EPFL), CH-1015 Lausanne.

[4] Michel Abdalla, Mihir Bellare, Phillip Rogaway,"

DHIES: An encryption scheme based on the Diffie-Hellman

Problem", September 18, 2001.

[5] Jean-Fran¸cois Raymond, Anton Stiglic," Security Issues

in the Diffie-Hellman Key Agreement Protocol".

[6] Whitfield Diffie and Martin E. Hellman," New Directions

in Cryptography", invited paper.

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economic and infrastructure security" in 2002.

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Wireless Sensor Networks", Infolab21, Lancaster University,

UK.

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Improved Authentication and Key Agreement Protocol

Using Elliptic Curve Cryptography" in 2006.

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the Diffie-Hellman Algorithm and its use in Secure

Internet Protocols".

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Diffie-Hellman, RSA, DSS, and Other Systems", Cryptography

Research, Inc. 607 Market Street, 5th Floor, San Francisco, CA

94105, USA.

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Mtech Thesis, Department of Computer Science and Media

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xchange.

The children of the dream

2017-07-17T12:08:00.001-07:00

فهرست نوشته ها

Mirzakhani, Maryam

2017-07-15T09:21:00.001-07:00

Maryam Mirzakhani was first women to win Fields Medal in math also professor at Stanford university.

RIP #MaryamMirzakhani

in Farshid Farhat 's Twitter

Deep Learning at Pennsylvania State University

2017-07-10T10:09:00.001-07:00

Integrating Deep-learned Models and Photography Idea Retrieval

Intelligent Portrait Composition Assistance (IPCA) – Integrating Deep-learned Models and Photography Idea Retrieval, Farshid Farhat, Mohammad Kamani, Sahil Mishra, James Wang, ACM Multimedia 2017, Mountain View, CA, USA.

ABSTRACT: Retrieving photography ideas corresponding to a given location facilitates the usage of smart cameras, where there is a high interest among amateurs and enthusiasts to take astonishing photos at anytime and in any location. Existing research captures some aesthetic techniques such as the rule of thirds, triangle, and perspectiveness, and retrieves useful feedbacks based on one technique. However, they are restricted to a particular technique and the retrieved results have room to improve as they can be limited to the quality of the query. There is a lack of a holistic framework to capture important aspects of a given scene and give a novice photographer informative feedback to take a better shot in his/her photography adventure. This work proposes an intelligent framework of portrait composition using our deep-learned models and image retrieval methods. A highly-rated web-crawled portrait dataset is exploited for retrieval purposes. Our framework detects and extracts ingredients of a given scene representing as a correlated hierarchical model. It then matches extracted semantics with the dataset of aesthetically composed photos to investigate a ranked list of photography ideas, and gradually optimizes the human pose and other artistic aspects of the composed scene supposed to be captured. The conducted user study demonstrates that our approach is more helpful than the other constructed feedback retrieval systems.

Full Text @ intelligent-portrait-composition-assistance-deep-learning-image-retrieval

Art, Computer Vision, Conference Paper, Deep Learning, Image Processing, Machine Learning, Pattern Recognition, Photography, Research, Thesis and tagged ACM Multimedia, ACMM, Aesthetics, AI, Art Theory, Artificial Intelligence, CBIR, Computer Vision, Content-based Image Retrieval, DEEP LEARNING, Deep-Learned Model Transfer, Human Pose, Human Pose Estimation, Image Aesthetics, Image Processing, Image Retrieval, Intelligent Portrait Composition Assistance, IPCA, Machine Learning, Object Detection, Pattern Recognition, Penn State Deep Learning, Photography, Photography Idea, Portrait, Portrait Composition, Portrait Dataset, Portrait Photography, Pose Estimation, Pose Recommendation, Scene Parsing

FORK-JOIN QUEUE MODELING AND OPTIMAL SCHEDULING IN PARALLEL PROGRAMMING FRAMEWORKS

2017-05-08T21:19:00.001-07:00

FORK-JOIN QUEUE MODELING AND OPTIMAL SCHEDULING IN PARALLEL PROGRAMMING FRAMEWORKS

ABSTRACT

MapReduce framework is widely used to parallelize batch jobs since it exploits a high degree of multi-tasking to process them. However, it has been observed that when the number of servers increases, the map phase can take much longer than expected. This thesis analytically shows that the stochastic behavior of the servers has a negative effect on the completion time of a MapReduce job, and continuously increasing the number of servers without accurate scheduling can degrade the overall performance. We analytically model the map phase in terms of hardware, system, and application parameters to capture the effects of stragglers on the performance. Mean sojourn time (MST), the time needed to sync the completed tasks at a reducer, is introduced as a performance metric and mathematically formulated. Following that, we stochastically investigate the optimal task scheduling which leads to an equilibrium property in a datacenter with different types of servers. Our experimental results show the performance of the different types of schedulers targeting MapReduce applications. We also show that, in the case of mixed deterministic and stochastic schedulers, there is an optimal scheduler that can always achieve the lowest MST.

KEYWORDS

Stochastic processes, Computational model, Delayed Tailed Distribution, Optimal scheduling, Cloud computing, Synchronization, Queuing Theory, MapReduce, Stochastic Modeling, Performance Evaluation, Fork-Join Queue.

: MapReduce

Security Weaknesses in PGP Protocol

2009-02-14T08:39:00.000-08:00

Academic Endeavors at Pennsylvania State University