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2007 Quantum Electronics and Laser Science Conference, QELS

作者： Bonato, C. Aspelmeyer, M. Jennewein, T. Pernechele, C. Villoresi, P. Zeilinger, A. CNR/INFM Laboratory for Ultraviolet and X-Ray Optical Research Department of Information Engineering University of Padova V. Gradenigo 6 35131 Padova Italy Quantum Imaging Laboratory Dep. of Electrical and Computer Engineering Boston University Boston MA United States Institut für Experimentalphysik Universität Wien Vienna Austria Institut für Quantenoptik und Quanteninformation Österrichische Akademie der Wissenschaften Vienna Austria Italy

We analyze the sources of polarization transformation for single photons in a Space-to-Earth quantum communication link, particularly the satellite pointing system, giving an estimate of the effect and discussing poss... 详细信息

ISBN: (纸本)1557528349

关键词： Quantum communication

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Priority dropping for scalable video

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of Multimedia and Ubiquitous engineering 2007年第3期2卷 119-130页

作者： Xiaogang, Yang Jiqiang, Liu Ning, Li Kim, Tai-Hoon State Key Lab. of Software Development Env Beihang University Beijing China Dep. of Computer and Inf. Technology Beijing jiaotong University Beijing China Dept. of Multimedia Engineering Hannam University Daejeon Korea Republic of

For H.264/SVC, different layers or frames have different order of precedence according to their importance on video quality and the decoding process. Network should provide more protection for high priority layers or frames when SVC stream is transmitted over IP network. This paper proposes an active queue management algorithm based on priority dropping and PID algorithm, called PID_PD, which first drops the least important packets when network congestion arises. PID_PD implements differentiated service in IP layer to provide high quality video for end user. In addition, PID_PD does not create a side effect for the performance of control system. In this paper, we use BCC (Binomial Congestion Control) as source rate control protocol. BCC and PID_PD form a close-loop control system. By using a classic control theoretic approach to analyze the stability of the close-loop system, we present a method to decide the PID_PD parameters. Simulation shows PID_PD can protect important video data well, lower the disturbance of background flow, and decrease the packet loss rate of SVC flow.

关键词： Control systems

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Sending the most appropriate feedbacks to students

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WSEAS Transactions on information Science and Applications 2007年第3期4卷 584-591页

作者： Kuo, Rita Hsieh, Athena Chang, Maiga Heh, Jia-Sheng Department of Electronic Engineering Chung-Yuan Christian University No.200 Chung Pei Rd. Chung Li 32023 Taiwan Dep. of Information and Computer Engineering Chung-Yuan Christian University No.200 Chung Pei Rd. Chung Li 32023 Taiwan National Science and Technology Program for e-Learning in Taiwan No.300 Jungda-Rd. Chung-Li 32001 Taiwan

It is important for students getting suitable feedback information when either they are doing or completing a learning activity. This research tries to know what kind of feedback message is really useful to students. For this purpose, this paper develops a workable e-learning environment with feedback mechanism to gather the learning effects of students with different kinds of feedbacks. The experiment involves five fifth-grade classes and divides five classes into three different groups. The students in the control group have no feedback and students in the other two groups have different kinds of feedback messages. The analysis of experiment data contains two parts: the first one evaluates the feedback efficiencies for all groups;and, then all students will be separated into three clusters based on their academic achievement in order to do further analysis.

关键词： Feedback

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Design and implementation of the PLC control lab using GSM system

Design and implementation of the PLC control lab using GSM s...

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6th International Conference on Advanced Learning Technologies, ICALT 2006

作者： Wu, Ping-Huang Lin, Chin-Chung Kuo, Chin-Hwa Wu, Pei-Lin Department of Electrical Engineering TungNan Institute of Technology Taiwan Dep. of Computer Science and Information Engineering Tamkamg University Taiwan Department of Information Computer Education National Taiwan Normal University Taiwan

ISBN: (纸本)0769526322

It has become a trend to integrate automatic industries via Internet and wireless applications over network. Along with the advancement of technology development, research on wireless applications and remote control has become significant and popular today. Thus, we have designed and implemented a teaching platform with wireless applications and remote control using GSM system in the Mobile-PLC (M-PLC) control lab. The integration of the mobile control and measurement using the GSM Short Message Service (SMS) provides a teaching platform where students can learn anytime and anywhere. We can monitor machine operations using GSM system. The usability and economy of teaching media is apt, since cell phones are cheap, easy to operate and portable. © 2006 IEEE.

关键词： Programmable logic controllers

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Scheduling with QoS support for multi rate wireless systems with variable channel conditions 12

Scheduling with QoS support for multi rate wireless systems ...

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12th European Wireless Conference on Enabling Technologies for Wireless Multimedia Communications, European Wireless 2006

作者： Gougousis, Alexandros Paterakis, Michael Information and Computer Networks Laboratory Dep. of Electronic and Computer Engineering Technical University of Crete Chania Crete73100 Greece

ISBN: (纸本)9783800729616

Scheduling through wireless shared channels is a very challenging problem because of each user's link-state variations through time. The challenge lies in the support of the quality of service (QoS) of each user under the uncertainty of channel behavior. This problem becomes even more difficult for some of the 2.5G and 3.5G network architectures (e.g EDGE,HSDPA, HDR) where the supported transmission rate can take multiple values and the channel can not be modeled by the traditional ON-OFF model. In this paper we propose Expo-pred-wei, a new scheduling algorithm, which take advantage of the channel variations in order to maximize the total cell throughput and at the same time to preserve, in an efficient way, a minimum QoS for each user. In contrast to other proposed algorithms, our algorithm exhibits very good performance in a wide set of traffic scenarios including Real-Time (RT) or Non-Real-Time (NRT) traffic as well as mixed RT and NRT traffic.

关键词： Quality of service

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Monitoring of lake Nasser using remote sensing and GIS techniques 7

Monitoring of lake Nasser using remote sensing and GIS techn...

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7th Symposium on Remote Sensing: From Pixels to Processes 2006

作者： Mostafa, M.M. Soussa, H.K. Information Technology Institute GIS Department Ain Shams University Faculty of Engineering Irrigation and Hydraulics Dep. Egypt

To improve management of the main water resource in Egypt, the River Nile, the Aswan High Dam was constructed and fully operated between 1964 and 1971 aiming to control the floods and fluctuation in water provisioning levels, regulating the water releases (and store extra water) and generating hydroelectric power. Since that date, Lake Nasser, the water storage body behind the dam, was born, and it was subjected to many studies covering the quantity and quality of stored water and environmental resources. In this research, the environmental impacts, including morphological aspects, and sedimentation in the lake, was carried using remote sensing images. Spectral reflectance characteristics of the water were correlated with in-site data measurements to analyze spatial and temporal changes of characteristics. The fluctuation in water dep.hs leading to changes in the surface area as well as different geometric features of the lake were estimated by classification of the imagery data in spectral reflectance. The lake sediments were studied using digital image processing techniques and detected by the field data for an accurate assessment. Remote sensing techniques demonstrates a reliable environmental and water monitoring efficient methodology to the biggest artificial lake, Lake Nasser. © 2006 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Remote sensing

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Analysis of the IEEE 802.11e EDCA under statistical traffic

Analysis of the IEEE 802.11e EDCA under statistical traffic

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2006 IEEE International Conference on Communications, ICC 2006

作者： Tantra, Juki Wirawan Foh, Chuan Heng Tinnirello, Ilenia Bianchi, Giuseppe Centre for Multimedia and Network Technology School of Computer Engineering Nanyang Technological University Singapore Singapore Dep. of Electrical Engineering Universita di Palermo Palermo Italy Dep. of Electrical Engineering Universita degli Studi di Roma Tor Vergata Roma Italy

ISBN: (纸本)1424403553

Many models have been proposed to analyze the performance of the IEEE 802.11 distributed coordination function (DCF) and the IEEE 802.11e enhanced distributed coordination function (EDCA) under saturation condition. To analyze DCF under statistical traffic, Foh and Zukerman introduce a model that uses Markovian Framework to compute the throughput and delay performance. In this paper, we analyze the protocol service time of EDCA mechanism and introduce a model to analyze EDCA under statistical traffic using Markovian Framework. Using this model, we analyze the throughput and delay performance of EDCA mechanism under statistical traffic. © 2006 IEEE.

关键词： Telecommunication traffic

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Semi-fragile image watermarking using zernike moment and fuzzy C-means

Semi-fragile image watermarking using zernike moment and fuz...

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9th Joint Conference on information Sciences, JCIS 2006

作者： Hsieh, Ching-Tang Wu, Yeh-Kuang Hsu, Chih-Hsu Dep. of Electrical Engineering Tamkang University Taipei 25137 Taiwan Department of Information Technology Ching-Kuo Institute of Management and Health Keelung 203

ISBN: (纸本)9078677015

In order to improve the detection of malicious tampering images, it is necessary to decrease the fragility of hidden watermarks, even for digital images which have been incidentally distorted. In this paper, we propose a new invariant semi-fragile digital watermarking technique based on eigenvalues and eigenvectors of real symmetric matrix generated by the four pixel pairs. A signature bit for detecting the malicious tampering of an image is generated using the dominant eigenvector. And the multi-rings Zernike transform (MRZT) is proposed to achieve geometric invariance based on the fuzzy C-means and Zernike moment. The MRZT method is to the geometric distortions even when the image is under malicious attacks. Experimental results show that this algorithm can resist high quality JPEG compression, and improve the detection performance of various malicious tampering.

关键词： Digital watermarking

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A 2D ternary barcode detection system with a dual threshold

A 2D ternary barcode detection system with a dual threshold

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2006 5th IEEE Conference on Sensors

作者： Wakaumi, Hiroo Nagasawa, Chikao Dep. of Engineering Technology Tokyo Metropolitan College of Industrial Technology 1-10-40 Higashi-Ooi Shinagawa Tokyo 140-0011 Japan Dep. of Information and Communication Systems Engineering Tokyo Metropolitan University 1-1 Minami-Ohsawa Hachioji Tokyo 192-0397 Japan

ISBN: (纸本)1424403766

A 2D ternary barcode detection system employing a dual threshold method has been developed to increase both detection speed and range. This system, adaptable to any ternary barcode pattern through the subtraction of each attenuated enveloped line of two sampled detected barcode signals from the original sampled signals, respectively, enables long range detection at higher scanning speeds while still containing a large amount of information. The prototype system, combined with a time-sharing laser light emission method that allowed the system to double effective scanning speeds, and using a two-line ten-character ternary barcode consisting of nine elements per character with a minimum bar width of 0.4 mm, was confirmed to successfully detect over a range of more than 5 cm at a maximum scanning speed of 835 scan/sec, which is 16 times higher than conventional CCD cameras. This system is expected to enable the real-time identification of goods on production lines and in automated warehouses. © 2006 IEEE.

关键词： CCD cameras

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Reducing reconfiguration time of reconfigurable computing systems in integrated temporal partitioning and physical design framework 20

Reducing reconfiguration time of reconfigurable computing sy...

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20th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2006

作者： Mehdipour, Farhad Zamani, Morteza Saheb Ahmadifar, Hamid Reza Sedighi, Mehdi Murakami, Kazuaki Amirkabir University of Technology IT and Computer Engineering Department #424 Hafez Ave. Tehran Iran Kyushu University Dep. of Informatics Graduate School of Information Science and Electrical Engineering Fukuoka Japan Guilan University Engineering Faculty Rasht Iran

ISBN: (纸本)1424400546

In reconfigurable systems, reconfiguration latency is a very important factor impact the system performance. In this paper, a framework is proposed that integrates the temporal partitioning and physical design phases to perform a static compilation process for reconfigurable computing systems. A temporal partitioning algorithm is proposed which attempts to decrease the time of reconfiguration on a partially reconfigurable hardware, This algorithm attempts to find similar single or pair of operations between subsequent partitions. Considering similar pairs instead of single nodes brings about less complexity for routing process. By using this technique, smaller reconfiguration bit-stream is obtained, which directly decreases the reconfiguration overhead time at the run-time. A complementary algorithm attempts to increase the similarity of subsequent partitions by searching for similar pairs and using a technique called dummy node insertion, An incremental physical design process based on similar configurations produced in the partitioning stage improves the metrics over iterations. © 2006 IEEE.

关键词： computer systems

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