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Using Quantile Regression Approach to Analyze Price Movements of Agricultural Products in China

Journal of Integrative Agriculture 2012年第4期11卷 674-683页

作者： LI Gan-qiong XU Shi-wei LI Zhe-min SUN Yi-guo DONG Xiao-xia Agricultural Information Institute Chinese Academy of Agricultural Sciences/Key Laboratory of Agri-information Service Technology Ministry of Agriculture/Key Laboratory of Digital Agricultural Early Warning Technology and System Chinese Academy of Agricultural Sciences Beijing 100081 P.R. China Department of Economics University of Guelph Ontario N1G2W1 Canada

This paper studies how the price movements of pork,chicken and egg respond to those of related cost factors in short terms in Chinese *** employ a linear quantile approach not only to explore potential data heteroscedasticity but also to generate confidence bands for the purpose of price stability *** then evaluate our models by comparing the prediction intervals generated from the quantile regression models with in-sample and out-of-sample *** monthly data from January 2000 to October 2010,we observed these findings：（i） the price changes of cost factors asymmetrically and unequally influence those of the livestock across different quantiles;（ii） the performance of our models is robust and consistent for both in-sample and out-of-sample forecasts;（iii） the confidence intervals generated from 0.05th and 0.95th quantile regression models are good methods to forecast livestock price fluctuation.

关键词： cost factors agricultural products forecasting price movements quantile regression model

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Battery discharge characteristics of wireless sensors in building applications

Battery discharge characteristics of wireless sensors in bui...

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2012 9th IEEE International Conference on Networking, Sensing and Control, ICNSC 2012

作者： Guo, Wenqi Healy, William M. Zhou, MengChu Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States National Institute of Standards and Technology Gaithersburg MD 20899 United States Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 200092 China

ISBN: (纸本)9781467303880

Sensor nodes in wireless networks often use batteries as their source of energy, but replacing or recharging exhausted batteries in a deployed network can be difficult and costly. Therefore, prolonging battery life becomes a principal objective in the design of wireless sensor networks (WSNs). There is little published data that quantitatively analyze a sensor node's lifetime under different operating conditions. This paper presents several experiments to quantify the impact of key wireless sensor network design and environmental parameters on battery performance. Our testbed consists of MicaZ motes, commercial alkaline batteries, and a suite of techniques for measuring battery performance. We evaluate known parameters, such as communication distance, working channel and operating power that play key roles in battery performance. Through extensive real battery discharge measurements, we expect our results to serve as a quantitative basis for future research in designing and implementing battery-efficient sensing applications and protocols. © 2012 IEEE.

关键词： Zigbee

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Adaptive rate-distortion prediction for multiple reference selection and inter-mode decision

Adaptive rate-distortion prediction for multiple reference s...

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13th Pacific-Rim Conference on Multimedia, PCM 2012

作者： Zhao, Tiesong Zhang, Yun Kwong, Sam Wang, Hanli Chen, Qian Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China Department of Computer Science City University of Hong Kong Hong Kong Hong Kong Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai China

ISBN: (纸本)9783642347771

To minimize Rate-Distortion (RD) cost in video coding, RD Optimization (RDO) technique is adopted, which also brings increasingly computational complexity in Motion Estimation (ME), multiple reference selection and mode decision. In this paper, a Gaussian model based adaptive RD cost prediction method is developed to jointly speed up multiple reference selection and inter-mode decision. Besides the ability of achieving good coding efficiency with much reduced computational power, our method is also with two major advantages. First, it can achieve robust performance, including computational complexity reduction and almost intact video quality, with a wide range of video sequences resolutions and even for various scene changes;second, it could be either individually used or combined with the other efficient mode decision algorithms, and in both cases, our method could achieve remarkable performance, which is revealed by exhaustive experimental results. © 2012 Springer-Verlag.

关键词： Image coding

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Multi-grid analysis of the three-dimensional doppler radar radial velocity: Idealized cases study

Multi-grid analysis of the three-dimensional doppler radar r...

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2012 5th International Joint Conference on Computational Sciences and Optimization, CSO 2012

作者： Li, Wei Xie, Yuanfu Key Laboratory of Marine Environmental Information Technology National Marine Data and Information Service State Oceanic Administration Tianjin China NOAA Earth System Research Laboratory Boulder CO United States

ISBN: (纸本)9780769546902

Through idealized experiments, this study is to test the performance of multi-grid three-dimensional variantional (3D-Var) on three-dimensional (3D) Doppler radar radial velocity data assimilation, and to what degree the 3D Doppler radar radial velocity can improve the conventional (in situ) wind observation analysis. A two-scale idealized wind field is constructed, and then random-distributed conventional wind data and 3D Doppler radar radial velocity data are generated based on this idealized wind field. By assimilating these data and comparing the analyses with the true idealized circulation field, the multi-grid 3D-Var performance in 3D Doppler radar radial velocity analysis is evaluated. The effects of weak constraint and strong constraint on the multi-grid 3D-Var analyses are also presented. Results show that the 3D Doppler radar radial velocity data do provide additional useful information especially in the sparse distributed conventional observation situation, and the multi-grid 3D-Var with strong constraint can make better analyses on not only horizontal but also vertical velocity. © 2012 IEEE.

关键词： Velocity

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A relational taxonomy of services for large scale service repositories

A relational taxonomy of services for large scale service re...

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2012 IEEE 19th International Conference on Web services, ICWS 2012

作者： Wu, Yan Yan, Chungang Ding, Zhijun Wang, Pengwei Jiang, Changjun Zhou, Mengchu Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States School of Electronics and Information Engineering Tongji University Shanghai China

ISBN: (纸本)9780769547527

With the rapid development of service-oriented computing (SOC) and service-oriented architecture (SOA), the number of services is rapidly increasing. How to organize and manage services effectively in repositories to improve the efficiency of service discovery and composition is important. This paper proposes three categorization rules to classify services for a large scale repository to form a relational taxonomy. The service retrieve scope can be drastically narrowed by this taxonomy. Therefore, the efficiency of service discovery and service composition can be greatly improved. We evaluate and compare the performance of the proposed method and other related ones via a publicly available test set, ICEBE05. The experimental results validate the effectiveness and high efficiency of the proposed one. © 2012 IEEE.

关键词： Web services

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Logical difference analysis based on variable precision lower approximation operator and graded upper approximation operator

Logical difference analysis based on variable precision lowe...

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2012 International Conference on Computer Science and Information Processing, CSIP 2012

作者： Zhang, Xianyong Miao, Duoqian Department of Computer Science and Technology Tongji University Shanghai 201804 China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 201804 China College of Mathematics and Software Science Sichuan Normal University Chengdu Sichuan 610068 China

ISBN: (纸本)9781467314114

This paper aims to construct and analyze an original logical difference based on the quantitative approximation operators. According to the variable precision lower approximation operator and graded upper approximation operator, we first put forward the specific logical difference;the new concept makes the specific logical combination on precision and grade, and has the practical multiple quantitative meaning. Then, both the fundamental structure and properties are investigated and obtained for the logical difference. Furthermore, two algorithms, the regular and structural algorithms, are proposed and analyzed, and the structural algorithm has more advantages. Finally, an example is provided. The proposed concept partially extends the graded and classical approximation operators;thus, some properties are achieved correspondingly for these previous approximation operators. © 2012 IEEE.

关键词： Rough set theory

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Algorithms and analyses of logical difference of graded lower and upper approximation operators

Algorithms and analyses of logical difference of graded lowe...

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2012 International Conference on Computer Science and Information Processing, CSIP 2012

ISBN: (纸本)9781467314114

Grade serves as a fundamental quantitative index, and the graded rough set model is a basic model. Thus, this paper aims to investigate an original logical difference in the graded rough set model. According to the specific logical requirement on the grade index, the logical difference is put forward based on the graded lower and upper approximation operators;the new concept has the practical logical quantitative meaning. Then, both the macroscopic essence and microscopic fundamental structure are obtained for the new concept. For calculation, two algorithms, the conventional and microscopic algorithms are proposed and analyzed emphatically, and we conclude that the microscopic algorithm has more advantages in time and space complexity. Finally, the logical difference and its algorithms are both illustrated by an example. © 2012 IEEE.

关键词： Rough set theory

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A testability-aware low power architecture

A testability-aware low power architecture

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25th IEEE International system-on-Chip Conference, SOCC 2012

作者： Wang, Gang Wang, Jian Qi, Zi-Chu Key Laboratory of Computer System and Architecture Chinese Academy of Sciences Beijing 100190 China Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Loongson Technology Corporation Limited Beijing 100190 China

ISBN: (纸本)9781467312950

Test power consumption is becoming a major concern in low power integrated circuits(ICs). This paper presents a revised low power compression architecture for scan test. In this paper, the variance in power consumption is used to select test pattern during scan test, and a low power feedback MUX is added to the scan chains. Simulation results by mathematical methods show that the proposed test architecture is promising in reduction of power consumption. © 2012 IEEE.

关键词： Electric power utilization

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Trust-drive minimize cost within deadline algorithm for instance-intensive workflows in cloud computing environment

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Journal of Convergence Information technology 2012年第13期7卷 412-419页

作者： Daoguo, Li Mukuai, Wang Rong, Zhao Hangzhou Dianzi University China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University China

Cloud computing is an emerging paradigm and it has been accepted and researched widely both in industry and academic fields. Instance-intensive workflows are workflows with a great number of concurrent instances;they are typical applications in cloud computing environment. However, cloud resources consist of unreliable servers;it becomes increasingly important to provide reliable scheduling strategy. Considering unreliable cloud resources and QoS requirements of instanceintensive workflows, we propose Trust-drive Minimize Cost Within Deadline (TD-MCWD) scheduling algorithm. On the one hand, the TD-MCWD algorithm staggers deadlines of the large number of concurrent instances of the same nature, expecting to get cheaper and more intensively competitive resources. On the other hand, considering the risk factors on the basis of resource reliability was estimated by trust model, the TD-MCWD algorithm tends to assign the task to the high reliable resource. Simulation experiment shows TD-MCWD algorithm can reduce the rate of delayed instance completion and the average execution cost of successful instance completion. Besides, TD-MCWD has a better load balancing and shows a better performance.

关键词： Quality of service

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Cache locking for network processing acceleration

Cache locking for network processing acceleration

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2012 10th IEEE International Symposium on Parallel and Distributed Processing with Applications, ISPA 2012

作者： Su, Wen Gao, Xiang Wang, Jing You, Ruibang Key Laboratory of Computer System and Architecture Chinese Academy of Sciences China Institute of Computing Technology Chinese Academy of Sciences China Graduate University Chinese Academy of Sciences China Loongson Technology Corporation Limited China

ISBN: (纸本)9780769547015

With the dramatic increase in network speed during the past ten years, network processing efficiency has been significantly decreased. In this paper, we propose a network accelerating scheme, which employs cache locking method to reduce data and instruction accessing latency. Interrupts handling and buffer maintenance overheads are obviously decreased. Experimental results show that our solution increases about 22% network bandwidth and reduces 10% latency. © 2012 IEEE.

关键词： Locks (fasteners)

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