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A micromachined monolithic half coaxial transmission line filter

A micromachined monolithic half coaxial transmission line fi...

引用

Asia-Pacific Conference on Microwave

作者： I. Llamas-Gano Yongsung Kim Chang-Wook Back Yong-Kweon Kim Sch. of Electr. Eng. & Comput. Sci. Seoul Nat. Univ. South Korea Nano Fabrication Center Samsung Advanced Institute of Technology Yongin Kyoungki-Do Korea School of Electrical Engineering and Computer Science Seoul National University Seoul Korea

In this paper, we present the design and development of a micromachined monolithic half coaxial transmission line filter. The proposed transmission line has an air gap between conductors, to provide low propagation losses, while allowing the use of wide center conductors to reduce conductor losses. Additionally by using a quartz substrate, dielectric losses are minimized. Out of experimental resonators we have extracted an unloaded quality factor of 141. The transmission line is used in the design of a three pole, capacitively coupled bandpass filter, having a 5% fractional bandwidth and a center frequency of 31.75 GHz.

关键词： Coaxial components Transmission lines Conductors Propagation losses Dielectric substrates Dielectric losses Resonator filters Q factor Couplings Band pass filters

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Super-resolution from highly undersampled images

Super-resolution from highly undersampled images

引用

IEEE International Conference on Image Processing

作者： P. Vandewalle L. Sbaiz M. Vetterli S. Sustrunk School of Computer and Communication Sciences Ecole Poly technique Fédérale de Lausanne (EPFL) Lausanne Switzerland School of Computer and Communication Sciences Ecole Polytechnique Federale de Lausanne Lausanne Switzerland Department of Electrical Engineering and Computer Science UC Berkeley Berkeley CA Ecole Polytechnique Federale de Lausanne Lausanne VD CH Sch. of Comput. & Commun. Sci. Ecole Polytech. Fed. de Lausanne Switzerland

Aliasing artifacts in images are visually very disturbing. Therefore, most imaging devices apply a low-pass filter before sampling. This removes all aliasing from the image, but it also creates a blurred image. Actually, all the image information above half the sampling frequency is removed. In this paper, we present a new method for the reconstruction of a high resolution image from a set of highly undersampled and thus aliased images. We use the information in the entire frequency spectrum, including the aliased part, to create a sharp, high resolution image. The unknown relative shifts between the images are computed using a subspace projection approach. We show that the projection can be decomposed into multiple projections onto smaller subspaces. This allows for a considerable reduction of the overall computational complexity of the algorithm. A high resolution image can then be reconstructed from the registered low resolution images. Simulation results show the validity of our algorithm.

关键词： Image resolution Frequency Image reconstruction Signal resolution Image sampling High-resolution imaging Sampling methods Computational complexity Computational modeling Reconstruction algorithms

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Top-down instruction, bottom-up learning in a microcontroller lab

Top-down instruction, bottom-up learning in a microcontrolle...

引用

ASEE 2004 Annual Conference and Exposition, "engineering Researchs New Heights"

作者： Turpin, Richard H. University of the Pacific Sch. of Eng. and Computer Science Department of Electrical Engineering Sch. of Eng. and Computer Science University of the Pacific Stockton CA

This paper presents, explains and illustrates a sch.me for replacing a sequence of singular lab projects in a microcontroller laboratory course with an integrated set of projects that centers on the design of a controller for an embedded system application. The objective of the new sch.me is to package student learning experiences in a framework that encourages and enables students to acquire a more comprehensive understanding of the process of designing and implementing a complete solution to a complex, real-time embedded system controller. "Top-Down Instruction" refers to the concept of providing a suitable model for an embedded system solution and design process from the start, whereas "Bottom-Up Learning" reflects the fact that the students' learning must begin at their level. Further, the sch.me is designed to enhance the students' ability to learn, understand and use new engineering concepts, tools and components in order to prepare them for life as continuous learners. The instructor's perspective on course outcomes is presented.

关键词： computer aided instruction

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Online and batch learning of pseudo-metrics

Online and batch learning of pseudo-metrics

引用

Proceedings, Twenty-First International Conference on Machine Learning, ICML 2004

作者： Shalev-Shwartz, Shai Singer, Yoram Ng, Andrew Y. Sch. of Comp. Sci. and Engineering Hebrew University Computer Science Department Stanford University

ISBN: (纸本)1581138385

We describe and analyze an online algorithm for supervised learning of pseudo-metrics. The algorithm receives pairs of instances and predicts their similarity according to a pseudo-metric. The pseudo-metrics we use are quadratic forms parameterized by positive semi-definite matrices. The core of the algorithm is an update rule that is based on successive projections onto the positive semi-definite cone and onto half-space constraints imposed by the examples. We describe an efficient procedure for performing these projections, derive a worst case mistake bound on the similarity predictions, and discuss a dual version of the algorithm in which it is simple to incorporate kernel operators. The online algorithm also serves as a building block for deriving a large-margin batch algorithm. We demonstrate the merits of the proposed approach by conducting experiments on MNIST dataset and on document filtering.

关键词： Online systems

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Profile of a successful engineering student at a private, liberal arts university

Profile of a successful engineering student at a private, li...

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ASEE 2004 Annual Conference and Exposition, "engineering Researchs New Heights"

作者： Van Treuren, Ken Eisenbarth, Steve Baylor University Department of Engineering Baylor University Sch. of Eng. and Computer Science Baylor University

With shrinking engineering enrollments, programs are looking for ways of predicting and measuring student success. Profiling incoming and graduating students gives some insight as to what student information might be used as a predictor of success. Eventually, these identified qualities of a successful student might be used to prescreen potential students and to counsel high sch.ol students interested in an engineering career. A wide variety of factors are available for analysis using already existing University and Department databases. The first factor thought to measure student success is usually cumulative GPA however, that alone is not a sole predictor of success. Other data, such as SAT verbal and math scores, first semester GPA, high sch.ol graduation rank, high sch.ol extra curricular activities, concurrent employment, internships, math placement exams, socio-economic factors, gender and minority status, may also be indicators of student success. Preliminary data suggest involvement in student professional societies enhances graduation rates. Passing the Fundamentals of engineering Exam indicates a minimum level of academic success on a national assessment tool. Comparisons are made between incoming freshman data and final graduating student data. Also, a comparison is made between the engineering student profile and that of a typical liberal arts incoming freshman.

关键词： engineering education

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A new course for freshmen: Introduction to electrical and computer engineering (w/ lab)

A new course for freshmen: Introduction to electrical and co...

引用

ASEE 2004 Annual Conference and Exposition, "engineering Researchs New Heights"

作者： Turpin, Richard H. University of the Pacific Department of Electrical Engineering Sch. of Eng. and Computer Science University of the Pacific Stockton CA

This paper describes a spring semester course, Introduction to Electrical and computer. engineering, for freshmen EE and CpE majors as a sequel to the fall semester course, Introduction to engineering. The primary purpose of the course is to provide students with more focused career guidance and to introduce them to certain fundamental concepts and skills relating to the practice and study of electrical and computer engineering. Particular focus is given in the paper to the laboratory element, which culminates in the students' assembly of their own microcontroller project boards.

关键词： Electrical engineering

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Architectural approaches for dynamic translation and reconfiguration

Architectural approaches for dynamic translation and reconfi...

引用

2004 IEEE Region 5 Conference: Annual Technical and Leadership Workshop

作者： Veale, Brian F. Antonio, John K. Tull, Monte P. School of Computer Science University of Oklahoma Norman OK 73019 Sch. of Elec./Computer Engineering University of Oklahoma Norman OK 73019

ISBN: (纸本)078038217X

A microprocessor taxonomy is introduced based on whether: (1) the hardware is static or reconfigurable and (2) the code translation process is static or dynamic. The IBM DAISY and Transmeta Crusoe™ microprocessors are reviewed. These static hardware microprocessors support a dynamic translation process to execute programs originally compiled for the PowerPC and Intel® X86 microprocessors, respectively. Inspired by features from both the DAISY and Crusoe™ microprocessors, a conceptual design of a dynamically reconfigurable microprocessor is given. Driven by the results of a preliminary study, a specific approach to designing a reconfigurable microprocessor is presented. As a part of this approach, the concept of partitioning the instruction set of a microprocessor in order to support an application, instead of partitioning the functionality of the application, is developed.

关键词： Microprocessor chips

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Sensorless position control of active magnetic bearings based on high frequency signal injection with digital signal processing

Sensorless position control of active magnetic bearings base...

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19th Annual IEEE Applied Power Electronics Conference and Exposition - APEC 2004

作者： Yim, Jung-Sik Sul, Seung-Ki Ahn, Hyeong-Joon Han, Dong-Chul Sch. of Elec. Eng./Computer Science Seoul National University Korea Republic of Sch. of Mech./Aerospace Engineering Seoul National University Korea Republic of

The high frequency signal injection method in the sensorless position control of Active Magnetic Bearings (AMB), has some merits such in that there is no steady-state error in the estimated position and can control the amplitude of the signals used for position estimation. In this paper, a method to inject a high frequency signal and to process the signal to obtain the position of the rotor has been proposed. In this method, all signal processing is done in the digital domain, and in contrast to the analog method, there is no offset nor are there any continuous tuning problems. The proposed method does not need additional hardware for signal injection and signal processing. The PWM inverter, which is used to regulate coil current, generates the injection signal, and the DSP, which is used to control the system, performs signal processing in a normal sampling cycle. The experimental results show reasonable performance with regard to the 4-degree-of-freedom control of rotor position, while rotating at 30,000 [r/min].

关键词： Magnetic bearings

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Atomic page update methods for OpenMP-aware software DSM

Atomic page update methods for OpenMP-aware software DSM

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Proceedings - 12th Euromicro Conference on Parallel, Distributed and Network-based Proceedings, PDP 2004

作者： Kee, Yang-Suk Kim, Jin-Soo Jeun, Woo-Chul Ha, Soonhoi Institute of Computer Technology Seoul National University Division of Computer Science KAIST Sch. of Comp. Sci. and Engineering Seoul National University

ISBN: (纸本)0769520839

When software distributed shared memory (SDSM) is extended to utilize threads in support of OpenMP, a challenge is how to preserve memory consistency in a thread-safe way, which is known as "atomic page update problem". In this paper, we show that this problem can be solved by creating two independent access paths to a physical page and by assigning different access permissions to them. Especially, we discuss three new methods using System V shared memory IPC, a new mdup() system call, and a fork() system call as well as a known method using file mapping. The main contribution of this paper is to introduce various solutions to the atomic page update problem and to compare their characteristics extensively. Experiments carried out on a Linux-based cluster of SMPs and an IBM SP Nighthawk system show that the proposed methods achieve better performance than the file mapping method and the method using the process creation mechanism is the best candidate for the IBM SP system.

关键词： Multiprocessing systems

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Improved trajectory linearization flight controller for reusable launch vehicles

Improved trajectory linearization flight controller for reus...

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42nd AIAA Aerospace sciences Meeting and Exhibit

作者： Bevacqua, Tim Best, Eric Huizenga, Andrew Cooper, David Zhu, J. Jim Sch. of Elec. Eng./Computer Science Avionics Engineering Center Ohio University Athens OH 4570 United States

This paper presents an improved design of the ascent and entry flight controllers of the X-33 reusable launch vehicle technology demonstrator using the technique of trajectory linearization control (TLC) that was originally published in 2000 and 2001, respectively. The revised ascent controller design uses the launch plumb-line kinematics model that is appropriate for the X-33 and includes aerodynamic derivatives that were neglected in the previous design. The time-varying bandwidth (gain) adaptation algorithm has also been revised to respond to flight characteristics in transonic and different dynamic pressure flight regimes. The revised entry controller includes the originally neglected aerodynamic derivatives and a bandwidth (gain) adaptation algorithm that responds to dynamic pressure changes. Some implementation errors have also been corrected. Test results on the NASA Advanced Guidance and Control (AG&C) Testing and the Integration and Testing of Advanced Guidance and Control (ITAG&C) Testing will also be presented, which show that the performance, robustness and fault tolerance of the redesigned controller have been improved significantly.

关键词： Flight dynamics

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