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International Symposium on Integrated Circuits (ISIC)

作者： Yuen-Haw Chang Yu-Jhang Chen Dept. of Computer Science and Information Engineering Chaoyang University of Technology Wufong Taichung Taiwan

ISBN: (纸本)9781479948321

This paper presents the modeling & implementation of a closed-loop high-gain switched-inductor switched-capacitor converter (SISCC) for step-up DC-DC conversion & regulation. The power part of SISCC consists of two cascaded blocks: (i) Front: a serial-parallel switched-capacitor (SC) circuit with nc pumping capacitors, and (ii) Core: a switched-inductor (SI) booster with mc resonant capacitors, so as to boost the step-up gain up to (nc+1)x(mc+1) at most, where D is the duty cycle of pulse-width-modulation (PWM) control. The control part of SISCC is composed of a phase generator and PWM controller, mainly implemented in the chip (I.C. number: D35-101B-37e, TSMC 0.35μm 2P4M, size: 500μm×300μm, 12.2mW, max. frequency: 200kHz) via full-custom fabrication of National Chip Design and Implementation Center (CIC), Taiwan. Some theoretical analysis includes: formulation, steady-state analysis, and conversion ratio. Finally, the performance of this scheme is verified experimentally on a SISCC prototype, and the results are illustrated to show the efficacy of this scheme.

关键词： Capacitors Switches Pulse width modulation Inductors Silicon Steady-state Charge pumps

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CRA: A Real-Time CUDA-Based Resolution Adapter in Screen Recording Applications

CRA: A Real-Time CUDA-Based Resolution Adapter in Screen Rec...

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IEEE International Conference on Computational science and engineering, CSE

作者： Kang-Tso Wu Shin-Hung Chang Dept. of Computer Science and Information Engineering Fu Jen Catholic University Taipei Taiwan

ISBN: (纸本)9781479979820

Recently, screen recording technology is widely used by lots of applications, such as remote control, distance learning, and distance conference etc. A problem, called Asymmetric Screen Resolution (ASR) in this paper, will occur in these applications. The ASR problem means that the resolution of a recording computer is different from that of a display computer. Different computer system will have different screen resolution and the ASR problem will result in screen recording resolution mismatch between the recording computer and display computer. This paper proposes a novel CRA algorithm to apply advantage of the CUDA parallel computing for adjusting the resolution on the Graphics Processing Unit (GPU). This algorithm effectively reduces CPU utilization and guarantees the display quality after adjusting resolution. Four different application scenarios, web browsing, text editing, slide presentation, and video playback are used to test the performance of our proposed CRA algorithm. These experiments measure CPU utilization and the PSNR of image adjusted by the CRA algorithm. The experimental results show that CRA algorithm effectively reduce CPU utilization 32%~40% while using whole screen in resolution adjustment. The CRA algorithm effectively reduces CPU utilization 0.1%~13% while using difference rectangle in resolution adjustment. On image quality measurements, the PSNR value is controlled between 25db~28db while using the CRA algorithm to adjust screen resolution from 1920×1080 to 1536×864. The PSNR value is controlled between 26db~34db by using the CRA algorithm to adjust screen resolution from 1920×1080 to 960×540. Using CRA algorithm presented in this paper will definitely get a good image quality, and effectively reduce CPU utilization.

关键词： computers Interpolation Graphics processing units Data transfer Instruction sets Image resolution Parallel processing

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Petri net modelling and analysis of mobile communication protocols UMTS, LTE, GPRS and MANET 4

Petri net modelling and analysis of mobile communication pro...

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4th International Conference on computer Communication and Informatics, ICCCI 2014

作者： Singh, Sukhdeep Singh, Gurpal Lakshmi Narasimhan, V. Pabla, Harcharan Singh Dept. of Computer Science and Engineering Gyan Vihar University Jaipur Rajasthan India Dept. of Information and Technology Gyan Vihar University Jaipur Rajasthan India Srikar and Associates Intl. Pty Ltd United States Srikar and Associates Intl. Pty Ltd Australia Srikar and Associates Intl. Pty Ltd India Department of Engineering and Computer Science Concordia University MontrealQC Canada

ISBN: (纸本)9781479923526

Petri net is a powerful modelling and analysis mechanism, which facilitates a smart way to understand events and dynamic systems. This paper provides an analysis of several generations of mobile network systems, namely, UMTS, LTE, GPRS and MANET using Petri net. The detailed analysis shows that these protocols are robust, bounded and deadlock free. © 2014 IEEE.

关键词： Petri nets

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Parallel Subcircuit Extraction Algorithm on GPGPUs

Parallel Subcircuit Extraction Algorithm on GPGPUs

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IEEE International Conference on High Performance Computing and Communications (HPCC)

作者： Che Lun Hung Hsiao Hsi Wang Chun Ting Fu Chia Shin Ou Dept. of Computer Science and Communication Engineering Providence University Taichung Taiwan Dept. of Computer Science & Information Management Providence University Taichung Taiwan Dept. of Computer Science National Tsing Hua University Hsinchu Taiwan

ISBN: (纸本)9781479961245

Subcircuit Extraction plays an important role in computer-Aided-Design of digital circuits. With the rapid growth of wafer processing technologies, the integration is from very large scale to giga large scale. Therefore, to extract sub circuits from such large scale integration is computation-consuming problem. In this paper, we propose a parallel sub circuit extraction algorithm on graphic processing unit. The experimental result shows that the proposed algorithm can achieve over 3x-7x times faster than serial algorithm.

关键词： Graphics processing units Instruction sets Transistors Algorithm design and analysis Logic gates Filtering algorithms Heuristic algorithms

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Comments on Chaotic Maps-Based Password-Authenticated Key Agreement Using Smart Cards

Comments on Chaotic Maps-Based Password-Authenticated Key Ag...

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International Conference on Intelligent information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Ya Fen Chang Wei Liang Tai Wei Na Wu Wei Han Li Yung Chi Chen Dept. of Computer Science and Information Engineering National Taichung University of Science and Technology Taichung Taiwan Dept. of Information Communications Chinese Culture University Taipei Taiwan

In 2012, Guo and Chang proposed a chaotic maps-based password-authenticated key agreement scheme. Their scheme uses smart cards and Chebyshev chaotic maps to enhance the security. After analyzing Guo and Chang's protocol, we find that their scheme does not provide forward secrecy and integrity is absent in password change phase. In this paper, details of the found flaws and some further suggestions are given.

关键词： Smart cards Protocols Authentication Chebyshev approximation Chaotic communication

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The Differences between Self-Organized Group and Designated Group for Cooperative Learning

The Differences between Self-Organized Group and Designated ...

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IEEE International Conference on Ubi-Media Computing

作者： Jian Wei Li Yao Tien Wang Yi Chun Chang Dept. Information and Communication Engineering Chaoyang University of Technology Taichung City Taiwan Dept. Computer Science and Information Engineering Hungkuang University Taichung City Taiwan

The literatures have indicated that cooperative learning facilitates enhancing learning performance, which focuses on (1) the interaction and the collaboration between grouping members, and (2) one member helping other members to be successful. The literatures have shown that the grouping organization is a critical issue for promoting learning achievement in cooperative learning. To evaluate the differences between the self-organized groups and the designated groups, this paper has conducted a serial of experiments and assessments to study the differences of learning performance, participation and satisfaction degree. In the self-organized groups the grouping members are decided by the grouping members, whereas the grouping members in the designated group are composited of the considering conditions. The experiment have demonstrated that the learning achievement of the designated group is high than the self-organized group. For the participation and the satisfaction degree of the curriculum, the self-organized group is high than the designated group.

关键词： Educational institutions Organizations Collaborative work Cities and towns Collaboration Programming

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Detection of Realistic Facial Occlusions for Robust 3D Face Recognition

Detection of Realistic Facial Occlusions for Robust 3D Face ...

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International Conference on Pattern Recognition

作者： Nese Alyuz Berk Gokberk Lale Akarun Dept. of Computer Engineering Bogazici University Istanbul Turkey Dept. of Electrical Eng. Mathematics and Computer Science University of Twente Enschede The Netherlands

Face is a highly utilized biometric, and 3D modality is preferred due to better handling of variations such as pose and illumination. However, occlusions covering the face alter the 3D surface and degrade the recognition performance. To improve recognition rates, the occluded parts should be detected prior to any surface comparison. In this paper, we consider two different occlusion detection approaches: The first one is based on statistical facial surface modeling, where pixel-wise Gaussian Mixture Models are trained. The second algorithm considers occlusion detection as a binary image segmentation problem: The regional cues of dept. values are incorporated with neighborhood cues, and the acquired surface is modeled as a graph. The surface pixels are labeled as either face or occlusion via the graph cut technique. Experiments on the Bosphorus and the UMB-DB databases, including realistic occlusion variations, show that both methods improve occlusion detection and face recognition rates as compared to the baseline technique.

关键词： Face Databases Detectors Face recognition Three-dimensional displays Computational modeling Training

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Random Access for a Cognitive Radio Transmitter with RF Energy Harvesting

Random Access for a Cognitive Radio Transmitter with RF Ener...

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IEEE Global Communications Conference

作者： Yue Lu Wei Wang Zhaoyang Zhang Aiping Huang Vincent K. N. Lau Dept. of Information Science and Electronic Engineering Zhejiang Key Lab. of Information Network Technology Zhejiang University Dept. of Electronic and Computer Engineering Hong Kong University of Science and Technology

ISBN: (纸本)9781479935130

In this paper, we investigate the random access for an energy harvesting secondary user (SU) in a cognitive radio system, in which the SU harvests energy from radio frequency (RF) radiation of the primary user (PU). With multipacket reception channel model, the SU can increase its throughput through not only utilizing the idle periods of the PU, but also opportunistically sharing the PU spectrum with some probability when the PU is active. By choosing the appropriate random access probability, we maximize the throughput of the SU under the constraint of the primary queue stability. We also define the energy-limited region and spectrum-limited region to specify the tradeoff between the SU performance and the PU activity. Furthermore, we investigate the effect of the primary queueing delay constraint on the throughput performance of the SU.

关键词： cognitive radio energy harvesting probability queueing theory radio spectrum management radio transmitters radiowave propagation wireless channels RF energy harvesting SU performance cognitive radio transmitter energy limited region multipacket reception channel model opportunistic PU spectrum sharing primary queue stability primary queueing delay constraint primary user radio frequency radiation random access random access probability secondary user spectrum limited region throughput performance Approximation methods Cognitive radio Energy harvesting Queueing analysis Radio frequency Stability analysis Throughput

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A NOVEL CIRCULAR APPROACH TO CHANGE DETECTION IN PAIR OF IMAGES EXTRACTED FROM IMAGE TIME SERIES

A NOVEL CIRCULAR APPROACH TO CHANGE DETECTION IN PAIR OF IMA...

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IEEE International Geoscience and Remote Sensing Symposium

作者： Lorenzo Bruzzone Francesca Bovolo Dept. of Information Engineering and Computer Science University of Trento Center for Information and Communication Technology Fondazione Bruno Kessler

ISBN: (纸本)9781479953141

This paper presents a novel approach to binary change detection in pairs of images extracted from time series. The main idea is that, given a binary change detection map obtained with any literature technique applied to the considered pair of images, we can identify possible change detection errors exploiting other images in the time series. This can be done by considering other pairs of images in the time series that, jointly with the analyzed one, can define a closed circular path in time. Then we model the binary change variable as a conservative field along circular paths within the time series. If for a pixel the circular path does not satisfy the conservativeness property an error is detected. Accordingly, the change detection label on that pixel is considered unreliable Experimental results obatined on a time series of ASAR Envisat images point out the effectiveness of the approach in detecting unreliable pixels.

关键词： Change detection Time series Time correlation Circular conservative field Remote sensing

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On Variable Selection of a Nonlinear Non-parametric System with a Limited Data Set: A Stepwise Algorithm

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IFAC Proceedings Volumes 2014年第3期47卷 4979-4984页

作者： Er-wei Bai Kang Li Wenxiao Zhao Dept. of Electrical and Computer Engineering University of Iowa Iowa City Iowa 52242 School of Electronics Electrical Engineering and Computer Science Queen's University Belfast UK Academy of Mathematics and Systems Science China

This paper considers a problem of identification for a high dimensional nonlinear non-parametric system when only a limited data set is available. The algorithms are proposed for this purpose which exploit the relationship between the input variables and the output and further the inter-dependence of input variables so that the importance of the input variables can be established. A key to these algorithms is the non-parametric two stage input selection algorithm.

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