Results for "Tansu Daylan"

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Inference of Unresolved Point Sources At High Galactic Latitudes Using Probabilistic CatalogsJul 15 2016Mar 09 2017Detection of point sources in images is a fundamental operation in astrophysics, and is crucial for constraining population models of the underlying point sources or characterizing the background emission. Standard techniques fall short in the crowded-field ... More
Inference of Unresolved Point Sources At High Galactic Latitudes Using Probabilistic CatalogsJul 15 2016We construct a Bayesian framework to perform inference of dim or overlapping point sources. The method involves probabilistic cataloging, where samples are taken from the posterior probability distribution of catalogs consistent with an observed photon ... More
Stellar Flares from the First Tess Data Release: Exploring a New Sample of M-dwarfsJan 02 2019We perform a study of stellar flares for the 24,809 stars observed with 2 minute cadence during the first two months of the TESS mission. Flares may erode exoplanets' atmospheres and impact their habitability, but might also trigger the genesis of life ... More
Improved Point Source Detection in Crowded Fields using Probabilistic CatalogingMar 03 2017Aug 07 2017Cataloging is challenging in crowded fields because sources are extremely covariant with their neighbors and blending makes even the number of sources ambiguous. We present the first optical probabilistic catalog, cataloging a crowded (~0.1 sources per ... More
Probing the small-scale structure in strongly lensed systems via transdimensional inferenceJun 19 2017Mar 05 2018Strong lensing is a sensitive probe of the small-scale density fluctuations in the Universe. We implement a novel approach to modeling strongly lensed systems using probabilistic cataloging, which is a transdimensional, hierarchical, and Bayesian framework ... More
TESS full orbital phase curve of the WASP-18b systemNov 14 2018Mar 15 2019We present a visible-light full orbital phase curve of the transiting planet WASP-18b measured by the TESS Mission. The phase curve includes the transit, secondary eclipse, and sinusoidal modulations across the orbital phase shaped by the planet's atmospheric ... More
The Characterization of the Gamma-Ray Signal from the Central Milky Way: A Compelling Case for Annihilating Dark MatterFeb 26 2014Mar 17 2015Past studies have identified a spatially extended excess of $\sim$1-3 GeV gamma rays from the region surrounding the Galactic Center, consistent with the emission expected from annihilating dark matter. We revisit and scrutinize this signal with the intention ... More
A Robust Control Framework for Malware FilteringNov 12 2009We study and develop a robust control framework for malware filtering and network security. We investigate the malware filtering problem by capturing the tradeoff between increased security on one hand and continued usability of the network on the other. ... More
Fictitious Play with Time-Invariant Frequency Update for Network SecurityJun 17 2010We study two-player security games which can be viewed as sequences of nonzero-sum matrix games played by an Attacker and a Defender. The evolution of the game is based on a stochastic fictitious play process, where players do not have access to each ... More
Strong Gravity Effects of Rotating Black Holes: Quasiperiodic OscillationsMay 13 2012Feb 02 2013We explore strong gravity effects of the geodesic motion in the spacetime of rotating black holes in general relativity and braneworld gravity. We focus on the description of the motion in terms of three fundamental frequencies: The orbital frequency, ... More
Stochastic Games for Security in Networks with Interdependent NodesMar 11 2010This paper studies a stochastic game theoretic approach to security and intrusion detection in communication and computer networks. Specifically, an Attacker and a Defender take part in a two-player game over a network of nodes whose security assets and ... More
Security Games with Decision and Observation ErrorsMar 14 2010We study two-player security games which can be viewed as sequences of nonzero-sum matrix games played by an Attacker and a Defender. The evolution of the game is based on a stochastic fictitious play process. Players do not have access to each other's ... More
A Unified Mechanism Design Framework for Networked SystemsSep 02 2010Mechanisms such as auctions and pricing schemes are utilized to design strategic (noncooperative) games for networked systems. Although the participating players are selfish, these mechanisms ensure that the game outcome is optimal with respect to a global ... More
An Optimization and Control Theoretic Approach to Noncooperative Game DesignJul 01 2010This paper investigates design of noncooperative games from an optimization and control theoretic perspective. Pricing mechanisms are used as a design tool to ensure that the Nash equilibrium of a fairly general class of noncooperative games satisfies ... More
Hidden Symmetries and Geodesics of Kerr spacetime in Kaluza-Klein TheoryMar 07 2013The Kerr spacetime in Kaluza-Klein theory describes a rotating black hole in four dimensions from the Kaluza-Klein point of view and involves the signature of an extra dimension that shows up through the appearance of the electric and dilaton charges. ... More
Large-Scale Strategic Games and Adversarial Machine LearningSep 21 2016Decision making in modern large-scale and complex systems such as communication networks, smart electricity grids, and cyber-physical systems motivate novel game-theoretic approaches. This paper investigates big strategic (non-cooperative) games where ... More
Planar digraphs for automatic complexityFeb 02 2019We show that the digraph of a nondeterministic finite automaton witnessing the automatic complexity of a word can always be taken to be planar. In the case of total transition functions studied by Shallit and Wang, planarity can fail. Let $s_q(n)$ be ... More
Convergence Analysis of Quantized Primal-dual Algorithm in Network Utility Maximization ProblemsApr 04 2016Apr 22 2016This paper investigates the asymptotic and non-asymptotic behavior of the quantized primal dual algorithm in network utility maximization problems, in which a group of agents maximize the sum of their individual concave objective functions under linear ... More
Throughput Optimal Scheduling with Dynamic Channel FeedbackMar 23 2012Mar 27 2012It is well known that opportunistic scheduling algorithms are throughput optimal under full knowledge of channel and network conditions. However, these algorithms achieve a hypothetical achievable rate region which does not take into account the overhead ... More
Game-Theoretic Model of Incentivizing Privacy-Aware Users to Consent to Location TrackingJan 02 2016Nowadays, mobile users have a vast number of applications and services at their disposal. Each of these might impose some privacy threats on users' "Personally Identifiable Information" (PII). Location privacy is a crucial part of PII, and as such, privacy-aware ... More
HD 213885b: A transiting 1-day-period super-Earth with an Earth-like composition around a bright ($V=7.9$) star unveiled by TESSMar 18 2019We report the discovery of the 1.008-day, ultra-short period (USP) super-Earth HD 213885b (TOI-141b) orbiting the bright ($V=7.9$) star HD 213885 (TOI-141, TIC 403224672), detected using photometry from the recently launched \textit{TESS} mission. Using ... More
A Super-Earth and two sub-Neptunes transiting the bright, nearby, and quiet M-dwarf TOI-270Mar 14 2019We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three small planets transiting one of the brightest (K-mag 8.3) and nearest (22.5 parsec) M-dwarf hosts to date, TOI-270 (TIC 259377017). The system is observationally favourable, ... More
Competition and Regulation in Wireless Services MarketsDec 12 2011Sep 11 2012We consider a wireless services market where a set of operators compete for a large common pool of users. The latter have a reservation utility of U0 units or, equivalently, an alternative option to satisfy their communication needs. The operators must ... More
Dynamic Control of Interference Limited Underlay D2D NetworkJun 02 2016Device-to-Device (D2D) communication appears as a key communication paradigm to realizing the vision of Internet of Things (IoT) into reality by supporting heterogeneous objects interconnection in a large scale network. These devices may be many types ... More
Distributed Rate Allocation Policies for Multi-Homed Video Streaming over Heterogeneous Access NetworksJan 07 2010We consider the problem of rate allocation among multiple simultaneous video streams sharing multiple heterogeneous access networks. We develop and evaluate an analytical framework for optimal rate allocation based on observed available bit rate (ABR) ... More
Near-resonance in a system of sub-Neptunes from TESSJan 25 2019We report the Transiting Exoplanet Survey Satellite ($TESS$) detection of a multi-planet system orbiting the $V=10.9$ K0 dwarf TOI 125. We find evidence for up to five planets, with varying confidence. Three high signal-to-noise transit signals correspond ... More
An Eccentric Massive Jupiter Orbiting a Sub-Giant on a 9.5 Day Period Discovered in the Transiting Exoplanet Survey Satellite Full Frame ImagesJan 28 2019We report the discovery of TOI-172 b from the Transiting Exoplanet Survey Satellite (TESS) mission, a massive hot Jupiter transiting a slightly evolved G-star with a 9.48-day orbital period. This is the first planet to be confirmed from analysis of only ... More
Reinforcement Learning for Autonomous Defence in Software-Defined NetworkingAug 17 2018Despite the successful application of machine learning (ML) in a wide range of domains, adaptability---the very property that makes machine learning desirable---can be exploited by adversaries to contaminate training and evade classification. In this ... More
Adversarial Reinforcement Learning under Partial Observability in Software-Defined NetworkingFeb 25 2019Recent studies have demonstrated that reinforcement learning (RL) agents are susceptible to adversarial manipulation, similar to vulnerabilities previously demonstrated in the supervised setting. Accordingly focus has remained with computer vision, and ... More
The DECam Plane Survey: Optical photometry of two billion objects in the southern Galactic planeOct 03 2017The DECam Plane Survey is a five-band optical and near-infrared survey of the southern Galactic plane with the Dark Energy Camera at Cerro Tololo. The survey is designed to reach past the main-sequence turn-off at the distance of the Galactic center through ... More
WASP-4b Arrived Early for the TESS MissionMar 06 2019The Transiting Exoplanet Survey Satellite (TESS) recently observed 18 transits of the hot Jupiter WASP-4b. The sequence of transits occurred 81.6 $\pm$ 11.7 seconds earlier than had been predicted, based on data stretching back to 2007. This is unlikely ... More