| IONS: Information-Theory and Optimization of Networked Systems |
02-Mar-2009 |
7 pages |
| Authors:
Sergio Verdu; Mung Chiang; Bob Fry; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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 | In this project of Information-theory and Optimization of Networked Systems (IONS), we developed the approaches of geometric programming, information-control duality, erasure information, and stochastic network optimization for communication networks. Pathfinder applications to missile defense, telecommunications, and biological networks are studied. Several major awards were received by the team of co-PIs, including Shannon Award, IEEE Hamming Medal, Presidential Early Career Award for Scientists and Engineers, and Technology Review TR35 Young Innovator ... |
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| Very High Performance Organic Photonic Devices |
15 JAN 2008 |
82 pages |
| Authors:
Stephen Forrest; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| The objective was to demonstrate very high efficiency, low cost organic solar cells on flexible substrates based on vapor-deposited thin film organic semiconductors. Our goal is to obtain solar power conversion efficiencies of >10% -- a value without precedent in over 30 years of science and engineering targeted at achieving practical organic solar energy conversion devices. A further objective is to demonstrate an electrically pumped organic thin film laser, again ... |
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| Photonic Crystal/Nano-Electronic Device Structures for Large Array Thermal Imaging |
19 NOV 2007 |
14 pages |
| Authors:
Daniel C. Tsui; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| Lattice-matched InGaAs/Inp quantum well infrared detector (QWIP) exhibits high photoconductive gain but un-adjustable detection wavelength because of its fixed barrier height. The use of InxGa1-xAsyP1-y (InGaAsP) as the barrier material is superior to that of InP with regard to the flexibility of operating wavelength. In this letter we investigate the application of InGaAsP material in the long wavelength infrared detection. We report a broadband quantum well InGaAs/InGaAsP detector covering 8-14 ... |
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| Electron Spin Decoherence Times in Si-Based Structures |
11 NOV 2005 |
6 pages |
| Authors:
Stephen A. Lyon; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| This project addressed several major questions concerning the coherence of electron spins in Si-based structures. Decoherence of the qubits is a fundamental limitation of any quantum computing device. Our goal is to understand the origin of spin decoherence for both free and bound electrons in Si. We have found that electrons bound to donors can have extremely long coherence times in isotopically enriched 28Si, with the ratio of their coherence ... |
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| Microwave Spectroscopy of Strongly Correlated 2D Electrons |
04 OCT 2005 |
4 pages |
| Authors:
D. C. Tsui; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| We have investigated the microwave absorption of clean two-dimensional (2D) electron systems (with mobility exceeding 1 0(exp 7)cm(exp 2)/Vs) in GaAs/Al(x)Ga(1-x)As heterostructures in high magnetic fields when the single particle energy spectrum is a series of discrete Landau levels. Our results, as summarized below, give direct evidence for the existence of several new phases of 2D electron matter and provide us new insights into the strong correlation physics therein. |
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| High Frequency Performance of Self-Assembled Monolayer (SAM) Organic FETs |
MAY 2004 |
20 pages |
| Authors:
James C. Sturm; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| As a step towards developing FETs with a device length of a single molecule, modeling shows that FET action in FETs of very short channel length are most likely to occur for long (>5 nm) channel lengths. Therefore self- assembled monolayers of a stacked 11-mercaptoundecanoic acid (MUA) were grown to define an arbitrarily long device length (in excess of 10 nm). The electrical properties of these films were investigated with ... |
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| Probing 2D Physics with Microwave |
17 OCT 2003 |
4 pages |
| Authors:
Daniel Tsui; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| Microwave absorption, using the co-planar waveguide configuration that we developed earlier, was employed to investigate electron dynamics of the high mobility 2D charge carriers in GaAs/AlxGa1-xAs heterostructures. Three experiments were carried out: (1) Dynamic response of composite fermions in an anti-dot lattice (2) Observation of microwave induced cyclotron harmonics, and (3) Investigation of pinning of the Wigner crystal and measurement of the crystal correlation lengths as a function of carrier ... |
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| Lithographically Patterned Quantum Dot Structures for Infrared Detection |
23 MAY 2003 |
5 pages |
| Authors:
Stephen Chou; Daniel Tsui; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| Significant progress was made to further advance the quantum well infrared photodetector (QWIP) technology in two areas: 1) designing, demonstrating, and understanding voltage tunable two-color QWIPs, and 2) understanding the light coupling mechanism in the so-called quantum grid infrared photo-detectors. We have also been working on imprint technology to create pillars which can be used to enhance the performance of the photo detectors. The NIL molds with different period and ... |
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| Content Analysis of Video Sequences |
FEB 2002 |
4 pages |
| Authors:
Michael Orchard; Robert Joyce; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| Content analysis of video sequences is a critical component of virtually any application involving the management of large video data sets. Systems for managing video databases or transmitting large numbers of video sequences are most efficient if they incorporate some understanding of the video content. The required analysis must be automated if large volumes of video are to be accommodated. This report presents two contributions of this project to problems ... |
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| Rapid Thermal Chemical Vapor Deposition for Dual-Gated Sub-100 nm MOSFET's |
18 OCT 2001 |
13 pages |
| Authors:
James C. Sturm; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| The main overall goal of this project was to improve the high speed performance of transistors and integrated circuits based on silicon, which is the material on which most microelectronic circuitry (such as microprocessors and memory chips) is based. This project examines the scaling of MOSFET's to very small channel dimensions using a vertical structure which is defined by Rapid Thermal Chemical Vapor Deposition. The scaling of vertical p-channel MOSFET's ... |
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| Wavelet Based Coding of Images and Video |
MAY 2001 |
3 pages |
| Authors:
Michael T. Orchard; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| The main goal of this project was to study and develop wavelet-based image and video compression algorithms, with focuses on algorithmic performance, image quality, and bandwidth optimization. This was accomplished by applying advanced statistical modeling to develop efficient image/video compression, incorporating task-oriented performance criteria for algorithmic optimization, and implementing wavelet-based video coding algorithms. This report is a summary of the work performed under this grant. |
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| Wavelet Domain Image Interpolation via Statistical Estimation |
2001 |
5 pages |
| Authors:
Ying Zhu; Stuart C. Schwartz; Michael T. Orchard; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| We propose a new wavelet domain image interpolation scheme based on statistical signal estimation. A linear composite MMSE estimator is constructed to synthesize the detailed wavelet coefficients as well as to minimize the mean squared error for high-resolution signal recovery. Based on a discrete time edge model we use low-resolution information to characterize local intensity changes and perform resolution enhancement accordingly. A linear MMSE estimator follows to minimize the estimation ... |
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| A General Classification Rule for Probability Measures |
12 AUG 1993 |
21 pages |
| Authors:
Ofer Zeitouni; Sanjeev R. Kulkarni; PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING
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| We consider the problem of classifying an unknown probability distribution based on a sequence of random samples drawn according to this distribution. Specifically, if A is a subset of the space of all probability measures M1(sigma) over some compact Polish space E, we want to decide whether or not the unknown distribution belongs to A or its complement. We propose an algorithm which leads a.s. to a correct decision for ... |
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