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A simple word trigger method for social tag suggestion

A simple word trigger method for social tag suggestion

引用

Conference on Empirical Methods in Natural Language Processing, EMNLP 2011

作者： Liu, Zhiyuan Chen, Xinxiong Sun, Maosong Department of Computer Science and Technology State Key Lab. on Intelligent Technology and Systems Beijing 100084 China National Lab. for Information Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)1937284115

It is popular for users in Web 2.0 era to freely annotate online resources with tags. To ease the annotation process, it has been great interest in automatic tag suggestion. We propose a method to suggest tags according to the text description of a resource. By considering both the description and tags of a given resource as summaries to the resource written in two languages, we adopt word alignment models in statistical machine translation to bridge their vocabulary gap. Based on the translation probabilities between the words in descriptions and the tags estimated on a large set of description-tags pairs, we build a word trigger method (WTM) to suggest tags according to the words in a resource description. Experiments on real world datasets show that WTM is effective and robust compared with other methods. Moreover, WTM is relatively simple and efficient, which is practical for Web applications. © 2011 Association for Computational Linguistics.

关键词： Social networking (online)

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Empirical study on rare query characteristics

Empirical study on rare query characteristics

引用

2011 IEEE/WIC/ACM International Conference on Web Intelligence, WI 2011

作者： Yao, Ting Zhang, Min Liu, Yiqun Ma, Shaoping Ru, Liyun State Key Lab. of Intelligent Technology and Systems Tsinghua National Laboratory for Information Science and Technology Dept. of Computer Science and Technology Beijing 100084 China

ISBN: (纸本)9780769545134

User behavior analysis has played an important role in Web information retrieval. Rare queries, whose frequencies are rather low, are usually ignored in existing studies due to the data sparseness. Little has been known about the mass of rare queries on either the information need or the user behavior. In this paper, we make an empirical study of users' behavior on rare queries using a large scale search log. Features concerning query, resource and post-query actions are analyzed, based on which we propose a practical categorization framework and obtain an overview of rare query composition. Further, we study the characteristics of several most commonly occurring types of rare queries, and suggest improving the search performance of them separately. This work gives more insights into understanding the long tail of queries and will be helpful for Web search in terms of rare queries. © 2011 IEEE.

关键词： Behavioral research

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Streamline-based visualization of 3D explosion fields

Streamline-based visualization of 3D explosion fields

引用

2011 7th International Conference on Computational Intelligence and Security, CIS 2011

作者： Wang, Yi Zhang, Wenyao Ning, Jianguo State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing China Beijing Lab. of Intelligent Information Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9780769545844

The visualization of explosion fields is an important issue in explosion science and technology. This paper presents a streamline-based method to visualize 3D explosion fields. Given the velocity data in a 3D explosion field, isosurfaces of the magnitude of velocity are firstly extracted. Seeds of streamlines are then uniformly distributed on the isosurfaces. And streamlines are generated with the placed seeds. By this way, the density of streamlines is controlled by a predefined value. When the isosurfaces and the density value are properly set, the coverage of streamlines can be sufficient. To reduce visual cluttering, a technique of line illumination is used to render streamlines. Moreover, a color coding technique is applied to visualize the magnitude of velocity and distinguish the distribution of media in 3D explosion fields. Test results show that the method proposed in this paper can achieve effective visualization of 3D explosion fields. The visual clarity and the spatial perception are improved in the final visualized images. © 2011 IEEE.

关键词： Explosions

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A low power catalytic combustion gas sensor based on a suspended membrane microhotplate

A low power catalytic combustion gas sensor based on a suspe...

引用

6th IEEE International Conference on Nano/Micro Engineered and Molecular systems, NEMS 2011

作者： Xu, Lei Li, Tie Gao, Xiuli Wang, Yuelin Zheng, Rui Xie, Lei Lee, Lichung State Key Laboratories of Transducer Technology Science and Technology on Micro-System Laboratory CAS Shanghai China RAE Lab. RAE Systems Shanghai China

ISBN: (纸本)9781612847757

A microhotplate based catalytic combustion gas sensor with low power consumption employing Pd-Pt/ γ-Al2O3 is presented in this paper. The microhotplate was fabricated on a silicon substrate by micromachining process. And the sensitive material Pd-Pt and compensation material γ-Al2O3 were prepared by sol-gel process. This sensor has been tested under constant working voltage to methane gas and achieved good performance. With the increasing of working voltage, both the output signal and power consumption of the sensor increased. The ratio of the sensitivity to power consumption was considered as an optimizing factor for selecting a rational working voltage. The sensor output signal showed a fairly linear relationship to the methane gas concentration. It achieved a sensitivity of 2mV/%CH4 to 50% LEL methane gas at a low power of 52mW. © 2011 IEEE.

关键词： Methane

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Fuzzy sliding mode control based on hybrid Taguchi genetic algorithm for magneto-rheological suspension system

Fuzzy sliding mode control based on hybrid Taguchi genetic a...

引用

作者： Dong, X.-M. Yu, M. Liao, C.-R. State Key Laboratory of Mechanic Transmission Chongqing University Chongqing 400044 China Key Lab. of Optoelectronic Technology and System Education Ministry Chongqing University Chongqing China

Magneto-rheological (MR) suspension systems display non-linearity and parameter uncertainty and thus it is difficult to derive an accurate model for designing a model-based controller. In this study, a novel fuzzy sliding mode control (FSMC) approach based on the hybrid Taguchi genetic algorithm (HTGA) is proposed to suppress the vibration of the MR suspension system. As the first step, the MR absorber is designed and manufactured based on the damping force level and mechanical dimensions required for the test car. After experimentally measuring the current-dependent damping force characteristic, a precise inverse model of the MR absorber is formulated. Subsequently, FSMC based on the HTGA is formulated on the basis of a quarter car model incorporated with an MR absorber. The linguistic variables and control rules of the fuzzy logic controller are optimized using the HTGA. For comparison purposes, two representative controllers including a conventional sliding mode controller and a fuzzy logic controller are also proposed. Finally, simulations and a road test are performed to validate the effectiveness and robustness of the proposed FSMC.

关键词： Controllers

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A full-mode FME VLSI architecture based on 8x8/4x4 adaptive Hadamard Transform for QFHD H.264/AVC encoder

A full-mode FME VLSI architecture based on 8x8/4x4 adaptive ...

引用

2011 IEEE/IFIP 19th International Conference on VLSI and system-on-Chip, VLSI-SoC 2011

作者： Liu, Jialiang Chen, Xinhua Fan, Yibo Zeng, Xiaoyang College of Information Science and Engineering Shandong University of Science and Technology Qingdao China State Key Lab. of ASIC and System Fudan University Shanghai China

ISBN: (纸本)9781457701719

Adaptive Block-size Transform (ABT) has been added to H.264/AVC standard with the Fidelity Range Extension. In this paper, we apply this ABT concept to our FME design and propose a full-mode FME architecture based on 8x8/4x4 adaptive Hadamard Transform. This technique can avoid unifying all variable block-size blocks into 4x4-size blocks and improve the encoding performance. We also exploit the linearity of Hadamard Transform in quarter-pel refinement and decrease the cycles caused by the second long search process. In architecture level, we employ two interpolating engines that can support 8-pel and 4-pel input to time-share one SATD (Sum of Absolute Hadamard Transform) Generator. These strategies can increase parallelism and reduce the cycles efficiently. Besides, this design can support full modes, which guarantees the encoding performance. Experimental results show that our design can achieve real-time processing for QFHD@30fps at the operation frequency of 320MHz with 444.6K gates hardware. © 2011 IEEE.

关键词： Signal encoding

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MUX-MCM based quantization VLSI architecture for H.264/AVC high profile encoder

MUX-MCM based quantization VLSI architecture for H.264/AVC h...

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2011 IEEE/IFIP 19th International Conference on VLSI and system-on-Chip, VLSI-SoC 2011

作者： Ying, Jiang Chen, Xinhua Fan, Yibo Zeng, Xiaoyang College of Information Science and Engineering Shandong University of Science and Technology Qingdao China State Key Lab. of ASIC and System Fudan University Shanghai China

ISBN: (纸本)9781457701719

This paper presents a hardware-efficient and high-throughput quantization implementation for H.264/AVC high profiles encoder. The constant multiplication in quantization is accomplished by time-multiplexed multiple-constant multipliers (MUX-MCM). By rational pipeline decision, the proposed design manages to achieve a high throughput at a low area cost. Synthesized with SMIC0.18μm technology, the proposed design reaches a maximum operating frequency of 250Mhz with a throughput of 1Gpixels/sec at the hardware cost of 28.56 Kgates. © 2011 IEEE.

关键词： Throughput

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Research on shunt APF's control system based on DSP and C/OS-II

Research on shunt APF's control system based on DSP and C/OS...

引用

2011 6th IEEE Conference on Industrial Electronics and Applications, ICIEA 2011

作者： Zha, Fan Chen, Lezhu School of Electrical Engineering and Information Anhui University of Technology Maanshan 243002 China State Key Lab. of Power System Tsinghua University Beijing 100084 China

ISBN: (纸本)9781424487554

This paper describes the work of designing a fully-digital shunt active power filter control system based on digital signal processor TMS320F2812. The control algorithm for control system of shunt active power filter is realized by DSP which is the core processor of the embedded operating system C/OS-II's hardware platform, the ip-iq principle is presented for the harmonic current extracting and the reference current generation. The SVPWM control method is used to make the harmonic current command signal into a pulse width commands to control the inverter generate compensation current. A simulation study with the MATlab.on the system has been done, and experimental results show that the designed digital control system works well and all the investigated control algorithms are effective to compensate load harmonic currents. © 2011 IEEE.

关键词： Digital control systems

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A low power 1.0 GHz VCO in 65nm-CMOS LP-process

A low power 1.0 GHz VCO in 65nm-CMOS LP-process

引用

2011 IEEE 9th International Conference on ASIC, ASICON 2011

作者： Zhang, Zhang Yu, Zhiyi Cheng, Xu Zeng, Xiaoyang Electronics and Apply Physical School Hefei University of Technology Hefei 230009 Anhui China State Key Lab. of ASIC and System Fudan University Shanghai 201203 China

ISBN: (纸本)9781612841908

A 1.0GHz, Voltage Controlled Oscillator (VCO) fabricated in TSMC 1.2V 1P9M 65nm CMOS LP-Process is presented in the paper. The output frequency is proportional to the control voltage (Vctrl). The advantage of the architecture is very simple and easy to be realized and it aims at low power, low area and low cost. Measured results show that the VCO operates at 400 MHz to 1.6 GHz while Vctl ranges from 0.8V to 1.4V and the tuning range is even larger than 100%. The VCO works well in Register File and consumes 0.5 mA from a 1.2-V power supply, and occupies an area of 400 μm2. © 2011 IEEE.

关键词： Variable frequency oscillators

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Study on non-invasive assessment of arterial stiffness

Study on non-invasive assessment of arterial stiffness

引用

IEEE 2011 10th International Conference on Electronic Measurement and Instruments, ICEMI 2011

作者： Zhao, Xueling Liu, Jin Joint Lab. of Information Sensing and Intelligent Control Tianjin University of Technology and Education Tianjin 300222 China State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University Tianjin 300072 China

ISBN: (纸本)9781424481590

Arterial stiffness is an effective parameter for monitoring sub-clinical arterial stiffness, and can tell effectively the cardioArterial health condition of human body. Elastic expansion coefficient of blood vessel (named as ETK) denotes the degree of arterial elastic expansion during systolic ejection, usually used to calculate other cardiovascular parameters as the intermediate variable. A new method is proposed to estimate directly the arteriosclerotic degree with ETK, and a non-invasive monitor for blood pressure and arterial stiffness is developed. Clinical experiment results show that the correlation coefficient between ETK and results of clinical ultrasound system is 0.76, which proves the validity of the method. © 2011 IEEE.

关键词： Blood vessels

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