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Thermal Stability of Reliable Polycrystalline Zirconium Oxide for Nonvolatile Memory Application

Chinese Physics Letters 2008年第10期25卷 3742-3745页

作者：周鹏李晶陈良尧汤庭鳌林殷茵 School of Microelectronies and State Key Lab of ASIC and System Fudan University Shanghai 200433 Department of Optical Science and Engineering Fudan University Shanghai 200433

Thermal stability of resistive switching of stoichiometric zirconium oxide thin films is investigated for high yielding nonvolatile memory application. The A1/ZrO2/AI cell fabricated in the conventional device process shows highly reliable switching behaviour between two distinct stable resistance states. The retention capabilities are also tested under various conditions and temperatures. The excellent performance of Ai/ZrO2/AI ceil can be explained by assuming that anode/ZrO2 interface exists and by conducting filament forming/rupture mechanism. The device failure is illustrated in terms of permanent conducting filaments formation.

关键词： the power-law exponents precipitation durative abrupt precipitation change

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Reconfigurable baseband processing platform for communication systems

Reconfigurable baseband processing platform for communicatio...

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IEEE Asia-Pacific Conference on Circuits and systems

作者： Xiaofang Zhou Shuang Zhao Wenqing Lu Chao Lu Gerald E. Sobelman State Key Lab of ASIC and System Fudan University Shanghai China Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN USA

New trends in wireless communication systems require multi-standard coexistence and high data rates. In order to meet these requirements, we propose a reconfigurable baseband platform with coarse grained heterogeneous execution units and flexible interconnections, which are controlled by configuration information. In addition, we demonstrate the effectiveness of our approach in three sample implementations, namely RFID, WLAN OFDM and MIMO-OFDM systems. The performance results reveal that this platform is flexible enough to handle various baseband operations with good efficiency and at reasonable resource cost.

关键词： Baseband Hardware Digital signal processing Radiofrequency identification OFDM Wireless communication communication system software communication system control Software radio communication switching

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Nitrogen and Silicon Co-Doping of Ge2Sb2Te5 Thin Films for Improving Phase Change Memory Performance

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Chinese Physics Letters 2007年第3期24卷 781-783页

作者：蔡燕飞周鹏林殷茵汤庭鳌陈良尧李晶乔保卫赖云峰冯洁蔡炳初陈邦民 Department of Microelectronics ASIC & System State Key Lab Fudan University Shanghai 200433 Department of Optical Science and Engineering Fudan University Shanghai 200433 Research Institute of Micro/Nanometer Technology Shanghai Jiao Tong University Shanghai 200030 Silicon Storage Technology Inc. 1171 Sonora Court Sunnyvale CA94086 U.S.A.

Electrical properties and phase structures of （Si＋N）-codoped Oe2Sb2Te5 （GST） for phase change memory are investigated to improve the memory performance. Compared to the films with N or Si dopants only in previous reports, the （Si＋N）-doped GST has a remarkable improvement of crystalline resistivity of about 104mΩcm. The Fourier-transform infrared spectroscopy spectrum reveals the Si-N bonds formation in the film. X-ray diffraction patterns show that the grain size is reduced due to the crystallization inhibition of the amorphous GST by SiNx, which results in higher crystalline resistivity. This is very useful to reduce writing current for phase change memory applications.

关键词： RANDOM-ACCESS MEMORY ELECTRICAL-PROPERTIES CRYSTALLIZATION IMPROVEMENT MODEL

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Design and analysis of a self-tuning proportional and integral controller for active queue management routers to support TCP flows

Design and analysis of a self-tuning proportional and integr...

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INFOCOM 2006: 25th IEEE International Conference on Computer communications

作者： Xiong, Naixue Défago, Xavier Jia, Xiaohua Yan, G. He, Yanxiang School of Information Science Japan Advanced Institute of Science and Technology State Key Lab. of Software Engineering Computer School Wuhan University School of Information Science Japan Advanced Institute of Science and Technology 1-1 Asahidai Nomi Ishikawa 923-1292 Japan Kowloon Hong Kong IEEE IEEE Communication Society Department of Computer Science Wuhan University City University of Hong Kong Kowloon Hong Kong School of Computer Science and Technology Wuhan University of Science and Technology China SMIEEE

ISBN: (纸本)1424402212

Active Queue Management (AQM) is an effective method used in Internet routers for congestion control, and to achieve a tradeoff between link utilization and delay. The de facto standard, the Random Early Detection (RED) AQM scheme, and most of its variants use average queue length as a congestion indicator to trigger packet dropping. This paper proposes a novel AQM algorithm, called Self-tuning Proportional and Integral RED (SPI-RED), as an extension of RED. SPI-RED is based on a Self-tuning Proportional and Integral controller, which not only considers the average queue length at the current time point, but also takes into consideration the past average queue lengths during a round-trip time. Furthermore, we give theoretical analysis of the system stability and give guidelines for the selection of feedback gains for the TCP/RED system to stabilize the average queue length at a desirable level. Extensive simulations have been conducted with ns2. The simulation results have demonstrated that the proposed SPI-RED algorithm outperforms the existing AQM schemes in terms of drop probability and stability.

关键词： Queueing networks

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On designing a novel PI controller for AQM routers supporting TCP flows

On designing a novel PI controller for AQM routers supportin...

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7th Asia-Pacific Web Conference on Web Technologies Research and Development - APWeb 2005

作者： Xiong, Nai-Xue He, Yan-Xiang Yang, Yan Xiao, Bin Jia, Xiaohua State Key Lab of Software Engineering Computer School of Wuhan University Wuhan Hubei 430079 China Computer Science Department Central China Normal University Wuhan 430079 China Department of Computing Hong Kong Polytechnic University Hung Horn Kowloon Hong Kong IEEE Communication Society Department of Computer Science City University of Hong Kong Kowloon Hong Kong

Active Queue Management (AQM) is an effective method to enhance congestion control, and to achieve tradeoff between link utilization and delay. The de facto standard, Random Early Detection (RED), and most of its variants use queue length as congestion indicator to trigger packet dropping. As an extension of RED, a novel AQM algorithm, called NPI-RED, is proposed in this paper. The NPI-RED is based on a novel proportional and integral controller, which not only considers the average queue length at the current time slot, but also takes into consideration the past average queue lengths within a round trip time. We provide a guideline for the selection of the feedback gains for TCP/RED system to stabilize the dynamics, make the queue length converge at a certain target and improve the network performance. We present the condition of asymptotic stability for the model in terms of the average queue length, by using a method, in which we construct a Routh table associated with the characteristic polynomial. Based on the stability condition and control gains selection method, the extensive simulation results by ns2 demonstrate that the NPI-RED algorithm outperforms than the existed AQM schemes in robustness, drop probability and stability. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Control equipment

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Optimal ramped-gate soft programming of over-erased flash EEPROM cells at given current

Optimal ramped-gate soft programming of over-erased flash EE...

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2004 7th International Conference on Solid-state and Integrated Circuits Technology Proceedings, ICSICT 2004

作者： Quan, Wu-Yun Baek, Chang-Ki Kim, Dae M. Gang, Ruan Huang, Yiping ASIC and System State-Key Research Lab. Department of Microelectronics Fudan University 220 Handan-road 200433 Shanghai China School of Electrical Engineering and Computer Science ISRC Seoul National University Kwanak P.O. Box 34 Seoul 151-744 Korea Republic of Korea Institute for Advanced Study 207-43 Cheongryangri Seoul Korea Republic of

Presented herein is an efficient simulation technique enabling systematic investigation of the soft programming over-erased flash EEPROM cells. The simulation provides a method by which to find the optimal soft programming technique for given current. The method requires only the cell performance data and allows investigation of the soft programming under various bias conditions. In principle, the methodology can also be used to investigate the programming and erase operations. © 2004 IEEE.

关键词： Flash memory

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A novel MEMS gas sensor with effective combination of high sensitivity and high selectivity

A novel MEMS gas sensor with effective combination of high s...

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Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectronics

作者： Zhou, Jia Li, Po Zhang, Song Zhou, Feng Huang, Yiping Yang, Pengyuan Minhang, Bao ASIC and System State Key Lab. Department of Microelectronics Fudan University 220 Handan Road Shanghai 200433 China Chemistry Department Fudan University 220 Handan Road Shanghai 200433 China Department of Mechanical Engineering Inst. of Petrochemical Technology E.-China Univ. of Sci./Technology 1166 Songjin Road Shanghai 201512 China

A novel MEMS gas sensor including a PZT thin film layer and a zeolite layer is developed in this paper, which shows effective combination of high sensitivity and high selectivity. Working in resonating mode, the sensor depicts the mass loading due to molecular adsorption of the zeolite by the frequency shift. The relationship between the frequency shift in percent and the concentration of Freon is linear. The minimum mass loading of 3.5×10-9g and the sensitivity of -0.0024%/ppm can be determined from the experimental results.

关键词： Chemical sensors

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Zeolite-coated Microcantilever Gas Sensor

Zeolite-coated Microcantilever Gas Sensor

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2001 6th International Conference on Solid-state and Integrated Circuit Technology(ICSICT-2001)

作者： Jia Zhou Po Li Song Zhang Feng Zhou Yiping Huang Pengyuan Yang Minhang Bao ASIC and System State Key Lab Department of Microelectronics Fudan University Department of Mechanical Engineering Institute of Petrochemical Technology East-China University of Science and Technology Chemistry Department Fudan University

A novel freon gas sensor of piezoelectric microcantilever coated with zeolite has been developed in this *** by a PZT layer,the microcantilevers are employed to detect the concentration o

ISBN: (纸本)0780365208

A novel freon gas sensor of piezoelectric microcantilever coated with zeolite has been developed in this *** by a PZT layer,the microcantilevers are employed to detect the concentration o

关键词： microsensors gas sensors zeolites piezoelectric devices freon gas sensor piezoelectric microcantilever zeolite coating PZT layer gas concentration molecular sifter microporous material

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Real-time Path Planning for Intelligent Robots system Based on Vision Information

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IFAC Proceedings Volumes 1999年第2期32卷 861-866页

作者： Qingchun Meng Changjiu Zhou K. Jagannathan K.S. Leong Hongbo Ji Department of Electronics & Communication Engineering of Singapore Polytechnic 139651 Tel: 65 7721440 Fax: 65 7721974. Singapore Computer Science Dept. of Yantai University 264005 Yantai China State Key Lab. of Intelligent Technology & Systems of Tsinghua University 100084 Beijing China

Real-time path planning is a key subject in the research of a Multi-robot system, such as in soccer robot system, as in such system there are several robots to coordinate to complete one task and its workspace is time-varying. There exist unpredictable changes in such workspace. These changes will make the robots path planning tremendously hard. This paper introduce the study on the real-time planning of a multi-robot system, such as soccer robots system. In such systems, as there exist multiple mobile robots, robots path planning is highly required of real-time and of high path planning quality. In this paper, the definitions of Active Obstacle and Dominating Robot are put forward. Genetic-planning and Fuzzy-correction are developed as our path planning techniques. The concept of Sector Vital Value is proposed for Genetic-planning and Fuzzy-correction. Block-Inserting strategy is employed to further improve the system's real-time performance in the workspace modelization. It takes only 2% of workspace modeling time required by Grid-modeling technique. After taking the proposed measures, the system's real-time performance is improved a lot. The initial simulation shows that our planning strategy can meet real-time demand.

关键词： Multi-agent system Path Planning Fuzzy Logic Genetic Algorithms

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