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Chaos and bifurcation of voltage-mode-controlled buck dc-dc converter with multi control parameters

International Journal of Modelling and Simulation 2010年第4期30卷 472-478页

作者： Harb, Ahmad M. Harb, Souhib M. Batarseh, Issa E. School of Electrical and Computer Engineering University of Central Florida Orlando FL 32816 United States Electrical Engineering Department University of Science and Technology Irbid Jordan Taibah University Saudi Arabia Power Electronics research Center University of Central Florida UCF Orlando FL United States

In general, DC-DC converter is a highly nonlinear system. More than one decade ago, many researchers have approved that DC-DC converters are experiencing bifurcation and chaotic oscillations. In this paper, DC-DC buck converter is been studied and analyzed. The study showed that such DC-DC buck converter is experiencing a nonlinear behaviour (chaotic behaviour) under certain operation conditions. In this paper, we studied the bifurcation and chaos in the DC-DC buck converter by changing different control parameters. Bifurcation diagrams and state-space diagrams have been shown for these parameters.

关键词： Bifurcation (mathematics)

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Time-domain observation of Rabi flopping in a laser

Time-domain observation of Rabi flopping in a laser

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Conference on Lasers and Electro-Optics (CLEO)

作者： Hyunyong Choi Vasileios-Marios Gkortsas Laurent Diehl David Bour Scott Corzine Jintian Zhu Gloria Höfler Federico Capasso Franz X. Kärtner Theodore B. Norris Center for Ultrafast Optical Science Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA School of Engineering and Applied Sciences Harvard University Cambridge MA USA Agilent Laboratories Palo Alto CA USA

We report direct time-domain observation of Rabi flopping in an operating semiconductor quantum cascade laser.

ISBN: (纸本)9781557528896

We report direct time-domain observation of Rabi flopping in an operating semiconductor quantum cascade laser.

关键词： Time domain analysis Quantum cascade lasers Optical pulses Ultrafast optics Laboratories Lead compounds Temperature Resonance Wavelength measurement Pulse measurements

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Reducing energy use and operational cost of air conditioning systems with multi-objective evolutionary algorithms

Reducing energy use and operational cost of air conditioning...

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Congress on Evolutionary Computation

作者： Cristian Perfumo John K. Ward Julio H. Braslavsky Commonwealth Scientific and Industrial Research Organisation University of Newcastle Australia Commonwealth Scientific and Industrial Research Organisation Australia ARC Centre of Excellence of Complex Dynamic System and Control School of Electrical Engineering and Computer Science University of Newcastle Australia

Air conditioning is responsible for around 60% of energy use in commercial buildings and is rapidly increasing in the residential sector. Although each system is individually small, the proliferation of air conditioning and the correlation of energy use with temperature is driving peak demand and the need for electricity distribution network upgrades. Energy retailers are now looking for ways to reduce this aggregate peak demand, leading to a tradeoff between peak demand, energy cost and the thermal comfort of building occupants. This paper presents a multi-objective evolutionary algorithm (MOEA) to quantify trade-offs amongst these three competing goals. We study a scenario with 8 air conditioners (ACs) and compare our findings against the case of having all ACs working independently, irrespective of global goals. The results show that, with statistically significant certainty, any run of the MOEA outperforms any scenario where the ACs function independently to keep a given level of comfort on a typical hot day.

关键词： Buildings Electricity Measurement Aggregates Optimization Air conditioning Evolutionary computation

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Cooperative Bridges: Topology control in Cooperative Wireless Ad Hoc Networks

Cooperative Bridges: Topology Control in Cooperative Wireles...

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2010 Proceedings IEEE INFOCOM

作者： Jieun Yu Heejun Roh Wonjun Lee Sangheon Pack Ding-Zhu Du Network Research Lab. (NetLab) Korea University Seoul Rep. of Korea Dept. of Computer Science and Engineering Korea University Seoul Rep. of Korea WCU FNOT Research Center Korea University Seoul Rep. of Korea WCU FNOT Research Center School of Electrical Engineering Korea University Seoul Rep. of Korea Dept. of Computer Science Erik Josson School of Engineering and Computer Science University of Texas at Dallas Richardson TX USA

ISBN: (纸本)9781424458363

Cooperative Communication (CC) is a technology that allows multiple nodes to simultaneously transmit the same data. It can save power and extend transmission coverage. However, prior research work on topology control considers CC only in the aspect of energy saving, not that of coverage extension. We identify the challenges in the development of a centralized topology control scheme, named Cooperative Bridges, which reduces transmission power of nodes as well as increases network connectivity. We observe that CC can bridge (link) disconnected networks. We propose two algorithms that select the most energy efficient neighbor nodes, which assist a source to communicate with a destination node;an optimal method and a greedy heuristic. In addition, we consider a distributed version of the proposed topology control scheme. Our findings are substantiated by an extensive simulation study, through which we show that the Cooperative Bridges scheme substantially increases the connectivity while consuming a similar amount of transmission power compared to other existing topology control schemes.

关键词： Cooperative Communication Topology control Connectivity

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A statistical shape model using 2D-principal component analysis from few medical samples and its evaluation

A statistical shape model using 2D-principal component analy...

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International Conference on Software engineering and Data Mining (SEDM)

作者： Tomoko Tateyama Taishi Tanaka Shinya Kohara Amir Hossein Foruzan Akira Furukawa Yen-Wei Chen Intelligent Image Processing Laboratory College of Information Science and Engineering Ritsumeikan University Shiga Japan Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran Department of Radiology Shiga University of Medical Science Shiga Japan

ISBN: (纸本)9781424473243;9788988678220;9788988678213

Since the medical training samples are very limited, it is difficult to construct a statistical shape model with good generalization using few samples. In this paper, we propose a novel statistical shape modeling method using 2D PCA. The 3D shape is represented as a matrix by spherical parameterization. The experiments showed that our proposed method can reconstruct statistical shape model with good generalization even using fewer samples.

关键词： Biomedical imaging Shape control Biomedical engineering Principal component analysis Liver Information analysis Educational institutions Azimuth Covariance matrix Image analysis

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Effect of chirality on the silicon-carbon nanotube thermal interface resistance

Effect of chirality on the silicon-carbon nanotube thermal i...

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International Conference on Enabling science and Nanotechnology (ESciNano)

作者： Mohamed Osman Taejin Kim School of Electrical Engineering and Computer Science Washington State University Tri-Cities Richland WA USA National Cancer Institute Frederick Cancer Research and Development Center Frederick MD USA

In the present paper, thermal interface resistance between carbon nanotubes and silicon using molecular dynamic (MD) simulations is determined. The MD simulations showed a temperature discontinuity of 53°K and 56°K at the interface between silicon and (11,11) SWNT and (19,0), respectively. This results in thermal interfaces resistances of 2.85x10 -9 m K/W and 3.34x10 -9 m K/W at the interface between silicon and (11, 11) SWNT and (19, 0), respectively. These thermal interface resistances are of the same order of magnitude and the silicon (19, 0) CNT interface shows a 17% higher thermal interface resistance than that of silicon(11, 11) CNT interface.

关键词： Resistance

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A novel radio resource allocation scheme with delay considerations for OFDMA wireless networks

A novel radio resource allocation scheme with delay consider...

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IEEE Princeton Section Sarnoff Symposium

作者： Jian Liu Benny Bing Research Center of Optical Internet & Mobile Information Networks (COIMIN) University of Electronic Science and Technology Chengdu China School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)9781424455928;9781424455935

In this paper, we propose an adaptive cross-layer radio resource allocation (CL_ARRA) scheme, which is compatible with the IEEE 802.16e-2005 Orthogonal Frequency Division Multiple Access (OFDMA) air interface. The scheme comprises two steps: dynamic subcarrier allocation (DSA) and dynamic power allocation (DPA). Using DSA and DPA, we obtain a cross-layer function to maximize the system throughput and average delay performance under specific constraints. Unlike conventional methods that require different frequency resources for neighboring cells, our scheme allows overlapped cells to share the same frequency resource and reduces transmission collisions. In addition, our scheme incorporates a delay component to support real-time traffic. The performance of our scheme is validated by analytical and simulation results. It will be shown that CL_ARRA is superior to the proportional fair scheduler in 802.16e OFDMA because it takes into consideration of not only the channel state information but also the queue state information.

关键词： Resource management Wireless networks Delay Frequency conversion Throughput Road accidents Traffic control Performance analysis Analytical models Channel state information

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Scalable embedded Ge-junction vertical-channel tunneling field-effect transistor for low-voltage operation

Scalable embedded Ge-junction vertical-channel tunneling fie...

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IEEE Nanotechnology Materials and Devices Conference (NMDC)

作者： Min-Chul Sun Sang Wan Kim Garam Kim Hyun Woo Kim Jong-Ho Lee Hyungcheol Shin Byung-Gook Park System LSI Division Samsung Electronics Company Limited Yongin si South Korea School of Electrical Engineering and Computer Science Inter-University Semiconductor Research Center Seoul South Korea

While a tunneling field-effect transistor (TFET) is an attractive candidate for sub-20 nm ultra-low-power device, high I ON /I OFF and on-current are rarely reported with the deep-submicron structures. In this study, we propose a practical novel TFET structure with vertical channel and Ge junction, which shows high current ratio, low subthreshold swing and relatively high current even when the minimum device dimension is smaller than 20 nm. To find the optimum design, the off-state injection of a short-channel TFET and optimization of the source-side junction are studied by simulation.

关键词： Tunneling Logic gates Silicon MOSFET circuits Transistors Junctions Doping

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Impulse response invariant discretization of a generalized commensurate fractional order filter

Impulse response invariant discretization of a generalized c...

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World Congress on Intelligent control and Automation (WCICA)

作者： Yan Li Hu Sheng YangQuan Chen School of Control Science and Engineering Shandong University Jinan China Department of Electronic Engineering Dalian University of Technology Dalian China Center for Self-Organizing and Intelligent Systems (CSOIS) Department of Electrical and Computer Engineering Utah State University Logan UT USA

In this paper, we derive the impulse response of a generalized commensurate fractional-order filter of the form (s 2α +as α +b) -γ , where a, b ≥ 0, α ∈ (0, 1] and γ ∈ (0, 1). The asymptotic properties of the impulse responses are obtained. Moreover, based on the derived analytical impulse response, we show how to perform the discretization of the above fractional-order filter. Finally, a number of illustrated examples in time and frequency domains are provided as proofs of concepts.

关键词： Laplace equations Fractional calculus Frequency response Equations Time frequency analysis Time domain analysis

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The debye dielectric behavior of mixed normal and relaxor-ferroelectrics: Monte Carlo investigation

The debye dielectric behavior of mixed normal and relaxor-fe...

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12th International Meeting on Ferroelectricity, IMF-12 and the 18th IEEE International Symposium on Applications of Ferroelectrics, ISAF-18

作者： Laosiritaworn, Yongyut Kanchiang, Kanokwan Ngamjarurojana, Athipong Yimnirun, Rattikorn Guo, Ruyan Bhalla, Amar S. Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand ThEP Center CHE 328 Si Ayutthaya Road Bangkok 10400 Thailand Science and Technology Research Institute Chiang Mai University Chiang Mai 50200 Thailand School of Physics Institute of Science Suranaree University of Technology Nakhon Ratchasima 30000 Thailand Department of Electrical and Computer Engineering University of Texas at San Antonio One UTSA Circle San Antonio TX 78249-1644 United States

In this work, Monte Carlo simulation was used to investigate the Debye dielectric behavior of mixed normal- and relaxor-ferroelectrics. The results show that, with increasing temperature, the dielectric permittivity of the mixed system sharply increases at low temperatures but slowly decays at high temperatures, while still presenting the dielectric peaks close to the relaxor- and normal-ferroelectrics transition temperatures. Further, it is found that the sharpness, the magnitude, and the frequency dispersion of the dielectric peaks can be finely tuned by adjusting relevant normal-ferroelectric parameters in the model. However, the modified Curie-Weiss law shows that its exponent γ is governed by the inverse-temperature dependence as the exponent is very close to 2 regardless of normal-ferroelectric content. The functionalities of the Debye-type dielectric permittivity are then discussed along with the comparison with experiments. © Taylor & Francis Group, LLC.

关键词： Ferroelectric materials

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