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作者： Ling, Cong Mow, Wai Ho Gan, Lu Department of Electrical and Electronic Engineering Imperial College London London SW7 2AZ United Kingdom Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong Hong Kong School of Engineering and Design Brunel University London UB8 3PH United Kingdom

In this paper, we propose low-complexity lattice detection algorithms for successive interference cancelation (SIC) in multi-input multi-output (MIMO) communications. First, we present a dual-lattice view of the vertical Bell Labs Layered Space-Time (V-BLAST) detection. We show that V-BLAST ordering is equivalent to applying sorted QR decomposition to the dual basis, or equivalently, applying sorted Cholesky decomposition to the associated Gram matrix. This new view results in lower detection complexity and allows simultaneous ordering and detection. Second, we propose a partial reduction algorithm that only performs lattice reduction for the last several, weak substreams, whose implementation is also facilitated by the dual-lattice view. By tuning the block size of the partial reduction (hence the complexity), it can achieve a variable diversity order, hence offering a graceful tradeoff between performance and complexity for SIC-based MIMO detection. Numerical results are presented to compare the computational costs and to verify the achieved diversity order. © 2009 IEEE.

关键词： MIMO systems

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Wavelet octave energy for breast tumor classification on sonography : A new shape feature

Wavelet octave energy for breast tumor classification on son...

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IEEE International Conference on Networking, Sensing and Control

作者： Yueh-Ching Liao King-Chu Hung Cheng-Tung Ku Chin-Feng Tsai Shu-Mei Guo Department of Computer Science and Information Engineering National Cheng Kung University Taiwan Department of Computer and Communication Engineering National Kaohsiung First Science and Technology Taiwan Department of Digital Content Design Tzu Hui Institute of Technology Taiwan Institute of Engineering Science and Technology National Kaohsiung First Science and Technology Taiwan

Infiltrative nature of lesions is a significant feature of malignant breast lesion in ultrasound images. Characterizing infiltrative nature is crucial for the realization of computer-aided diagnosis system. In this study, the infiltrative nature is regarded as an energy that produces irregularly and considerably local variances in a 1D signal. The local variances can be enhanced by few high octave energies in 1D discrete periodized wavelet transform (DPWT). A test dataset of breast sonograms with the lesion contour delineated by an experienced physician and two inexperienced students are built for feature efficacy evaluation. A high individual performance result implies that the proposed feature is well correlated with radiologist's perception and closer to match those in trained physician than morphometric parameters. Experimental results also reveal that with a great performance improvement, the proposed feature is suitable for the combination with some morphometric parameters.

关键词： Breast tumors Ultrasonography Shape Lesions Discrete wavelet transforms Cancer Ultrasonic imaging computer aided diagnosis Testing Sonogram

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A full chip integrated power and substrate noise analysis framework for mixed-signal SoC design

A full chip integrated power and substrate noise analysis fr...

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Custom Integrated Circuits Conference (CICC)

作者： Daisuke Kosaka Yoji Bando Goichi Yokomizo Kunihiko Tsuboi Ying Shiun Li Shen Lin Makoto Nagata Department of Computer Science and Systems Engineering Kobe University Kobe Japan STARC Japan Apache Design Solutions Inc. USA

A fully integrated framework of full-chip power and substrate noise analysis is discussed, featuring description of transistor-level custom circuits as dynamic noise sources, a high capacity solver for chip-level substrate coupling, and noise back annotation flow to transistors of sensitive circuits. Recursive evaluation of power current and operation timing under the presence of dynamic IR drop greatly improves the accuracy of analysis. A 90-nm CMOS chip was examined both by on-chip noise measurements and full-chip noise analysis.

关键词： Coupling circuits Timing Noise measurement Circuit noise

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Deriving the Worst-Case Execution Time Input Values

Deriving the Worst-Case Execution Time Input Values

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Euromicro Conference on Real-Time Systems

作者： Andreas Ermedahl Johan Fredriksson Jan Gustafsson Peter Altenbernd School of Innovation Design and Engineering Mälardalen University Vasteras Sweden Department of Computer Science University of Applied Sciences Darmstadt Germany

ISBN: (纸本)9781424444960

A Worst-Case Execution Time (WCET) analysis derives upper bounds for execution times of programs. Such bounds are crucial when designing and verifying real-time systems. A major problem with todaypsilas WCET analysis approaches is that there is no feedback on the particular values of the input variables that cause the programpsilas WCET. However, this is important information for the real-time system *** present a novel approach to overcome this problem. In particular, we present a method, based on a combination of input sensitive static WCET analysis and systematic search over the value space of the input variables, to derive the input value combination that causes the WCET. We also present several different approaches to speed up the search. Our evaluations show that the WCET input values can be relatively quickly derived for many type of programs, even for program with large input value spaces. We also show that the WCET estimates derived using the WCET input values often are much tighter than the WCET estimates derived when all possible input value combinations are taken into account.

关键词： Real time systems Input variables Job shop scheduling Hardware Testing Technological innovation design engineering computer science Upper bound Feedback

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Residual stresses and mechanical properties of a ZnO pyroelectric sensor

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Theoretical and Applied Fracture Mechanics 2009年第1期52卷 1-6页

作者： Hsiao, C.C. Hu, Y.C. Chang, R.C. Chao, C.K. Department of Mechanical Design Engineering National Formosa University 64 Wunhua Rd Huwei Township Yunlin County 632 Taiwan Department of Mechanical and Electro-Mechanical Engineering National Ilan University 1 Sec. 1 Shen-Lung Road I-Lan 260 Taiwan Department of Mechanical and Computer-Aided Engineering St. John's University 499 Sec. 4 Tam King Road Tamsui Taipei 251 Taiwan Department of Mechanical Engineering National Taiwan University of Science and Technology 43 Sec. 4 Keelung Road Taipei 106 Taiwan

The multilayer composite film stack is a common feature of the microsensors based on thin film technology. In this paper, we propose an analytical model to investigate the Young's moduli, hardness, and residual stresses of the constitutive film layers of a multilayer film stack. A multilayer film stresses model is derived to evaluate the residual stress distributions in the constitutive film layers of a ZnO pyroelectric sensor. A good agreement among the multilayer film stresses model, the grain morphologies characterized by scanning electron microscopy, the mechanical properties testing by nanoindentation, and the voltage responsivity measurement of the ZnO pyroelectric sensor is found in this paper. The proposed multilayer film stresses model can therefore be used to quantitatively analyze the film stresses and proceed to the optimization of thin film deposition process. © 2009 Elsevier Ltd. All rights reserved.

关键词： Zinc oxide

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Tracking mobile target using selected sensors

Tracking mobile target using selected sensors

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International Communication Systems and Networks and Workshops, COMSNETS

作者： Vaishali P. Sadaphal Bijendra N. Jain Tata Research Development and Design Centre Pune India Department of Computer Science and Engineering Indian Institute of Technology Delhi New Delhi India

We consider the problem of tracking a mobile target using an energy constrained wireless sensor network. This paper develops and describes a methodology to track a mobile target that moves with varying speed and direction in a 2D plane. In this paper, we combine distance measurements from several sensors to estimate location of the target. Given that available energy in sensors is at a premium, we have proposed to reduce the number of measurements. We present a methodology to track the target using measurements from an adequate number of carefully selected sensors that measure distance and communicate to the tracker. In this paper, we present results of extensive simulations that we have carried out to test and validate the algorithms. We study through simulations how the frequency of measurements by sensors, velocity of the mobile target, the amount by which the target changes its direction of motion affect the accuracy of tracking.

关键词： Target tracking Distance measurement Wireless sensor networks Vehicles Mobile computing Energy measurement Battery charge measurement Bayesian methods computer science Testing

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Development of a biomimetic robotic bear: Or is a bare bear bearable?

Development of a biomimetic robotic bear: Or is a bare bear ...

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IEEE International Conference on Robotics and Biomimetics

作者： Peter Turner Michael Dickinson School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW Australia School of Design Communication an IT University of Newcastle Callaghan NSW Australia

This paper presents the issues encountered in the development of a robot based on the biometric influence of a bear. One of the main aims of this research was to explore the possibilities of a robot, which could move between the different styles of motion. The bear offers a unique example of an animal with high mass and bulk, which can move between being a quadruped and a biped. Our earlier research had explored the development of a robotic dog. A quadruped robot design, suitable for use as a player in the RoboCup Four Legged League, which used the parameters of the existing Sony Aibo robot as a starting point. The outcomes of this research have been discussed in papers by Chalup and Lawrence. The current research has extended the previous platform development and reset the objective to a robot with both bipedal and quadrupedal motion possibilities. The original objectives of developing a high quality design with enhanced research programming possibilities, which also coveys a positive and engaging image of science and engineering through its form, were maintained. This is specially so, when considering the robot's ability to create interest in the general public, who will view the robot from a perspective outside of discipline specific interests. The introduction presents the biological inspiration for the current design, including the preparation and material production considerations. This is followed by a discussion of specific features of the robotic bear design, which has been given the name HyKim, followed by a conclusion.

关键词： Biomimetics Australia Biometrics Legged locomotion Robot programming Bones Biological system modeling Leg Animal structures Maintenance engineering

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A new partial transmit sequence scheme using genetic algorithm for peak-to-average power ratio reduction in a multi-carrier code division multiple access wireless system

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International Journal of Autonomous and Adaptive Communications Systems 2009年第1期2卷 40-57页

作者： Zhang, Yang Ni, Qiang Chen, Hsiao-Hwa Electronic and Computer Engineering School of Engineering and Design Brunel University West London UB8 3PH United Kingdom Department of Engineering Science National Cheng Kung University Tainan City 70101 Taiwan

One major drawback of multi-carrier broadband wireless transmission system is that its signal may cause high peak-to-average power ratio (PAPR). This article proposes a new partial transmit sequence (PTS) scheme using genetic algorithm for PAPR reduction in a synchronous multicarrier code division multiple access wireless system. We investigate the impact of each genetic algorithm operator and optimally configure genetic algorithm to be suitable for the practical system design. The simulation results demonstrate that our proposed genetic algorithm-based PTS scheme achieves low PAPR values with much lower computational complexity than other existing solutions. Meanwhile, the optimal parameters of genetic algorithm assisted PTS are provided. Copyright © 2009 Inderscience Enterprises Ltd.

关键词： Peak to average power ratio

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Group personnel relationship analysis based on social networks

Group personnel relationship analysis based on social networ...

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IEEE International Symposium on Information (IT) in Medicine and Education, ITME

作者： Hong Wang Wei-dong Wang Na Xu Wen Huang Institute of Information Science and Engineering ShanDong Normal University China Institute of Computer Science and Technology ShanDong University JiNan China Shandong light industry design institute Jinan China

Nowadays, there is a little account of research which focuses on the theory and application of directed networks in the complex networks area. In this paper, a directed network model which describes the group personnel relationship is set up and simulated. Firstly, by analyzing the main workflow and the intercommunion way in the group, a directed network model which describes the group personnel relationship is set up. Then, with an e-mail directed network and a telephone directed network constructed, and by using the dyad method, an empirical social network model which correctly describes the group personnel relationship is set up. Finally, a simulation test is done. By comparing the group personnel relationship model and the empirical model, the simulation results in according with the empirical findings quit well.

关键词： Personnel Electronic mail Social network services Construction industry Biological system modeling Data mining Complex networks

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Generic Skills in Software engineering Master Thesis Projects: Towards Rubric-Based Evaluation

Generic Skills in Software Engineering Master Thesis Project...

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Conference on Software engineering Education & Training (CSEE&T)

作者： Robert Feldt Martin Höst Frank Lüders Systems and Software Engineering Blekinge Institute of Technology Ronneby Sweden Computer Science Lund University Lund Sweden School of Innovation Design and Engineering Mälardalen University Vasteras Sweden

There has been much recent interest in how to help students in higher education develop their generic skills, especially since this is a focus of the Bologna process that aims to standardize European higher education. However, even though the Master thesis is the final and often crucial part of a graduate degree and requires many generic skills very little research has directly focused on them. In particular, there is a lack of such knowledge for engineering education programs. In this paper we present results from a survey where we asked 23 students from three different Swedish Universities about which generic skills are needed and developed in a Master thesis project in software engineering. One outcome of our analysis is that there is a lack of understanding on how to define, and thus examine, generic skills in software engineering thesis projects.

关键词： Software engineering Systems engineering education computer science education computer science Technological innovation design engineering Educational technology Educational programs engineering education Large-scale systems

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