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Active optical clock based on four-level quantum system

Chinese science Bulletin 2013年第18期58卷 2033-2038页

作者： ZHANG TongGang WANG YanFei ZANG XiaoRun ZHUANG Wei CHEN JingBiao State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum ElectronicsSchool of Electronics Engineering & Computer SciencePeking University

Active optical clock,a new conception of atomic clock,has been proposed *** this work,we propose a scheme of active optical clock based on four-level quantum *** final accuracy and stability of two-level quantum system are limited by second-order Doppler shift of thermal atomic *** three-level quantum system,they are mainly limited by light shift of pumping laser *** limitations can be avoided effectively by applying the scheme proposed *** atom four-level quantum system,as a typical example,is *** population inversion between 6S 1/2 and 5P 3/2 states can be built up at a time scale of 10-6 *** the mechanism of active optical clock,in which the cavity mode linewidth is much wider than that of the laser gain profile,it can output a laser with quantum-limited linewidth narrower than 1 Hz in *** experimental configuration is designed to realize this active optical clock.

关键词：主动光学量子系统四能级时钟三能级系统激光增益多普勒频移粒子数反转

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A wearable wireless respiration rate monitoring system based on fiber optic sensors

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Sensor Letters 2014年第9期12卷 1331-1336页

作者： Elsarnagawy, Tarek Farrag, Manal Haueisen, Jens Abulaal, Magdy Mahmoud, Khalid Fouad, H. Ansari, S.G. Department of Communications and Networks Engineering Prince Sultan University Riyadh Saudi Arabia Computer Science Department Prince Sultan University Riyadh Saudi Arabia Institute of Biomedical Engineering and Informatics Technical University Ilmenau Ilmenau Germany Academy of Civil Aviation 6 October Airport Cairo Egypt Communication Engineering Department German University Cairo Egypt Department of Applied Medical Science Riyadh Community College King Saud University Riyadh Saudi Arabia Biomedical Engineering Department Faculty of Engineering Helwan University P. O. Box 11792 Helwan Egypt Centre for Interdisciplinary Research in Basic Sciences Jamia Millia Islamia New Delhi India

In this article a portable and wearable wireless system to measure the respiratory rate and signal using embedded fiber Bragg grating (FBG) based optical sensor into textile (nylon) is realized. The measured data is analyzed and compared with the output data of a commercial wired piezoelectric crystal film respiratory belt from Grass Technology (FBGT-200) as a reference for the sake of validation. The results showed that the resultant average respiratory rate and the signal correlation coefficients between the FBGT-200 and the reference respiratory belt was 0.99 and 0.72 respectively. A variation in correlation coefficient for respiratory signal is found which is related to the variation in volunteer respiration pattern. The developed fiber optic based monitoring system has been tested on ten volunteers of different chest circumferences.

关键词： Fiber optics

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Enabling location based services for hyperlocal marketing in connected vehicles

Enabling location based services for hyperlocal marketing in...

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International Conference on Connected Vehicles and Expo (ICCVE)

作者： Vishnu Narayanan Rosmi Rehman Alin Devassy Subramanian Rama Punit Ahluwalia Anand Ramachandran Department of Electronics and Communication Engineering Amrita University Department of Computer Science VU University Analog Devices Inc. Dell Inc. Department of Computer Information Systems & Quantitative Methods UT pan Am Amrita Center for Wireless Networks and Applications Amrita University

Location based services is a class of computing services that uses the consumer's location data in order to personalize and enable features and services. Services include those for mapping and tracking, emergency response and disaster management and location based advertising. Of these services, location based advertising, also knows as hyperlocal marketing, accounts for the largest market share. In this paper we provide a motivating example of a hyperlocal marketing service applicable to connected vehicles and explore communication architectures for enabling such location based services. The specific scenario we consider uses sensors to automatically detect automotive problems in an intelligent vehicle and share the information wirelessly with a hyperlocal marketing server. The server, in turn, gets a dynamically updated list of hyperlocal services from retailers which would be analyzed, filtered and delivered to the consumer wirelessly so that the consumer could avail of a suitable service to address the issue. While considering different architectures we highlight the lack of a suitable standard for vehicle-to-infrastructure communication and suggest that this area needs further study.

关键词： Servers Wireless networks Vehicles Wireless sensor networks Telematics Connected vehicles Sensors

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Complex field network-coded cooperation based on multi-user detection in wireless networks

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Journal of Systems Engineering and Electronics 2013年第2期24卷 215-221页

作者： Jing Wang Xiangyang Liu Kaikai Chi Xiangmo Zhao School of Information Engineering Chang'an University State Key Laboratory of Integrated Service Networks Xidian University Department of Network Management Xi'an Communication College College of Computer Science and Technology Zhejiang University of Technology

Cooperative communication can achieve spatial diversity gains,and consequently combats signal fading due to multipath propagation in wireless networks powerfully.A novel complex field network-coded cooperation（CFNCC） scheme based on multi-user detection for the multiple unicast transmission is *** analysis and simulation results demonstrate that,compared with the conventional cooperation（CC） scheme and network-coded cooperation（NCC） scheme,CFNCC would obtain higher network throughput and consumes less time ***,a further investigation is made for the symbol error probability（SEP） performance of CFNCC scheme,and SEPs of CFNCC scheme are compared with those of NCC scheme in various scenarios for different signal to noise ratio（SNR） values.

关键词： network coding complex field wireless network cooperative communication multi-user detection

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Direct Detection SCFDE for Passive Optical Network Based on TDM and Polarization Interleaving

Direct Detection SCFDE for Passive Optical Network Based on ...

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OptoElectronics and communications Conference

作者： Bangjiang Lin Juhao Li Hui Yang Yuanbao Luo Yangsha Wan Yongqi He Zhangyaun Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

We present TDM-SCFDE-PON architecture for colorless upstream transmission and polarization interleaving SCFDE-PON for high-speed downstream transmission. Compared with OFDM and SCFDM, SCFDE achieves the best receiver ... 详细信息

ISBN: (纸本)9781479950485

关键词： Passive optical networks time division multiplexing receiver sensitivity Polarization direct detection Orthogonal frequency division multiplexing

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Design and fabrication of tapered photonic crystal fiber for astro-combs applications

Design and fabrication of tapered photonic crystal fiber for...

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OptoElectronics and communications Conference

作者： Fuzeng Niu Tongxiao Jiang Aimin Wang Guizhong Wang Chen Li Zhigang Zhang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University

We report the design and fabrication of tapered photonic crystal fibers for efficient fceo detection and ultra-flat visible super-continuum generation, which are used in an astro-comb system.

ISBN: (纸本)9781479950485

We report the design and fabrication of tapered photonic crystal fibers for efficient fceo detection and ultra-flat visible super-continuum generation, which are used in an astro-comb system.

关键词： Crystal fibres Photonic crystal fibers fabrication tapering

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Anomaly detection with multinomial logistic regression and Naïve bayesian

Anomaly detection with multinomial logistic regression and N...

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FTRA 7th International Conference on Multimedia and Ubiquitous Engineering, MUE 2013

作者： Hai, Nguyen Dai Giang, Nguyen Linh School of Information and Communication Technology Hanoi University of Science and Technology Hanoi Viet Nam Department of Communication and Computer Networks Hanoi University of Science and Technology Hanoi Viet Nam

ISBN: (纸本)9789400767379

Intrusion Detection by automated means is gaining widespread interest due to the serious impact of Intrusions on computer system or network. Several techniques have been introduced in an effort to minimize up to some extent the risk associated with Intrusion attack. In this paper, we have used two novel Machine Learning techniques including Multinomial Logistic Regression and Naïve Bayesian in building Anomaly-based Intrusion Detection System (IDS). Also, we create our own dataset based on four attack scenarios including TCP flood, ICMP flood, UDP flood and Scan port. Then, we will test the system's ability of detecting anomaly-based intrusion activities using these two methods. Furthermore we will make the comparison of classification performance between the Multinomial Logistic Regression and Naïve Bayesian. © 2013 Springer science+Business Media Dordrecht(Outside the USA).

关键词： Floods

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Comparison between SVM and back propagation neural network in building IDS

Comparison between SVM and back propagation neural network i...

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FTRA 7th International Conference on Multimedia and Ubiquitous Engineering, MUE 2013

ISBN: (纸本)9789400767379

Recently, applying the novel data mining techniques for anomaly detection-an element in Intrusion Detection System has received much research alternation. Support Vector Machine (SVM) and Back Propagation Neural (BPN) network has been applied successfully in many areas with excellent generalization results, such as rule extraction, classification and evaluation. In this paper, we use an approach that is entropy based analysis method to characterize some common types of attack like scanning attack. A model based on SVM with Gaussian RBF kernel is also proposed here for building anomaly detection system. BPN network is considered one of the simplest and most general methods used for supervised training of multilayered neural network. The comparative results show that with attack scenarios that we create and through the differences between the performance measures, we found that SVM gives higher precision and lower error rate than BPN method. © 2013 Springer science+Business Media Dordrecht(Outside the USA).

关键词： Support vector machines

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1×2 SOI-based splitter using high contrast grating hollow-core waveguide

1×2 SOI-based splitter using high contrast grating hollow-c...

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Asia communications and Photonics Conference, ACP 2013

作者： Xue, Ping Li, Yunjie Chen, Te Hu, Weiwei State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University China

The 1×2 splitter using high contrast grating hollow-core waveguide is designed and fabricated on Silicon-On-Insulator. The experiment results present its good performance on beam splitting and polarization mainta... 详细信息

ISBN: (纸本)9781557529893

关键词： Silicon on insulator technology

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Dynamic HTTP download scheduling with respect to energy consumption

Dynamic HTTP download scheduling with respect to energy cons...

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2013 24th Tyrrhenian International Workshop on Digital communications - Green Information and communications Technology, TIWDC 2013

作者： Blenk, Andreas Kellerer, Wolfgang Wamser, Florian Zinner, Thomas Tran-Gia, Phuoc Institute for Communication Networks Technische Universität München Germany Institute of Computer Science University of Würzburg Germany

ISBN: (纸本)9781479907564

Mobile devices, in particular smartphones, are battery powered. As their small size limits their energy capacity, an intelligent and energy-saving use of resources is crucial for the mobile user experience. Especially energy saving while sending and receiving data becomes important due to the always-on nature of smartphones. One solution for a sophisticated resource usage in wireless access networks is to tailor resource management to applications. The advantage of such mechanisms is to be able to address both the perceived quality of the users and the energy consumption of mobile devices at the same time. We propose several traffic scheduling algorithms for HTTP file download in wireless networks based on this application-aware paradigm. The core idea is to use download scheduling that avoids parallel transmissions and, in contrast, favors sequential *** have implemented and measured the algorithms in a wireless mesh network. The evaluation results quantify the gain of an application-aware resource management with respect to quality of experience and energy consumption. © 2013 IEEE.

关键词： HTTP

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