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An Improved Adaptive Exponential Smoothing Model for Short-term Travel Time Forecasting of Urban Arterial Street

Acta Automatica Sinica 2008年第11期34卷 1404-1409页

作者： Zhi-Peng LI Hong YU Yun-Cai LIU Fu-Qiang LIU Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 200092 P. R. China Intelligent Transportation System Department Shanghai Electrical Apparatus Research Institute Shanghai 200063 P. R. China Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong University Shanghai 200240 P. R. China

Short-term forecasting of travel time is essential for the success of intelligent transportation system. In this paper, we review the state-of-art of short-term traffic forecasting models and outline their basic ideas, related works, advantages and disadvantages of each model. An improved adaptive exponential smoothing (IAES) model is also proposed to overcome the drawbacks of the previous adaptive exponential smoothing model. Then, comparing experiments are carried out under normal traffic condition and abnormal traffic condition to evaluate the performance of four main branches of forecasting models on direct travel time data obtained by license plate matching (LPM). The results of experiments show each model seems to have its own strength and weakness. The forecasting performance of IASE is superior to other models in shorter forecasting horizon (one and two step forecasting) and the IASE is capable of dealing with all kind of traffic conditions.

关键词： Travel time short-term forecasting license plate matching (LPM) exponential smoothing

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Implementation and Analysis of Probabilistic Methods for Gate-Level Circuit Reliability Estimation

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Tsinghua Science and Technology 2007年第S1期12卷 32-38页

作者：王真江建慧杨光 Key Laboratory of Embedded Systems and Service Computing Ministry of Education of Shanghai Department of Computer Science and Technology Tongji University

The development of VLSI technology results in the dramatically improvement of the performance of integrated circuits. However, it brings more challenges to the aspect of reliability. Integrated circuits become more susceptible to soft errors. Therefore, it is imperative to study the reliability of circuits under the soft error. This paper implements three probabilistic methods (two pass, error propagation probability, and probabilistic transfer matrix) for estimating gate-level circuit reliability on PC. The functions and performance of these methods are compared by experiments using ISCAS85 and 74-series circuits.

关键词： soft error soft error rate signal reliability failure probability reliability estimation

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Research on road topology based mobility prediction schemes

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High Technology Letters 2007年第2期13卷 140-144页

作者：陈林 Chen Hongzhong Jiang Changjun Key Lab of Embedded System and Service Computing of the Ministry of Education Department of Computer Science and Technology Tongji University Shanghai 201804 P.R.China

Geographic routing has been introduced in mobile ad hoc networks and sensor networks. But its per-formance suffers greatly from mobility-induced location errors that can cause Lost Link （LLNK） and LOOP problems. Thus various mobility prediction algorithms have been proposed to mitigate the errors, but sometimes their prediction errors are substantial. A novel mobility prediction technique that incorpo-rates both mobile positioning information and road topology knowledge was presented. Furthermore, the performance of the scheme was evaluated via simulations, along with two other schemes, namely, Linear Velocity Prediction （LVP） and Weighted Velocity Prediction （WVP） for comparison purpose. The results of simulation under Manhattan mobility model show that the proposed scheme could track the movement of a node well and hence provide noticeable improvement over LVP and MVP.

关键词： geographic muting mobility prediction road topology shortest path Manhattan mo-bility model

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WSHLA: Web services-based HLA collaborative simulation framework

WSHLA: Web services-based HLA collaborative simulation frame...

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4th International Conference on Cooperative Design, Visualization, and Engineering, CDVE 2007

作者： Hengye, Zhu Guangyao, Li Lulai, Yuan CAD Research Center Tongji University Shanghai 201804 China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 201804 China

ISBN: (纸本)9783540747796

Collaborative simulation technology is an important factor in improving the efficiency of complex product design. Although High Level Architecture (HLA)-based simulation technology can meet the needs for simulation in product design, it's also marked by many deficiencies. In this paper, we focus on the introduction of web services into HLA simulation system and propose a Web services-Based HLA Collaborative Simulation Framework (WSHLA). The framework uses web services to encapsulate the invocations of HLA services and then make simulation system more interoperable and reusable. Firstly, the overall structure of WSHLA and the proxy, which acts on behalf of a federate and interacts with Runtime Infrastructure (RTI), are presented. Then, the detailed design and implementation process of WSHLA are discussed. Experimental results show that, using web services, the framework can make up for the deficiencies in HLA simulation system and ensure WSHLA-based collaborative simulation goes smoothly at the expense of some time. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Web services

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An Enhanced Scheduling Solution to Support Quality of service for Broadband Wireless Access Networks

An Enhanced Scheduling Solution to Support Quality of Servic...

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第三届IEEE无线通讯、网络技术暨移动计算国际会议

作者： Fuqiang Liu Yuhui Huang Shangzhi Xu The Key Laboratory of Embedded System and Service Computing supported by Ministry of Education Broadband Wireless Communication and Multimedia Laboratory Tongji University Shanghai China

This paper proposes an enhanced scheduling solution to support different quality of service (QoS) for IEEE 802.16e broadband wireless access network. Based on the existing scheduling algorithm M-LWDF, we do deeper research into how to integrate it into IEEE 802.16e. The proposed scheduling solution combines the key service flow parameters defined by IEEE 802.16e standard with M-LWDF scheme. Simulation results show that the delay character is improved for real-time services using the proposed method.

关键词： scheduling QoS BWA

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An improved test case generation method of pair-wise testing

An improved test case generation method of pair-wise testing

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16th Asian Test Symposium, ATS 2007

作者： Qian, Feng-An Jiang, Jian-Hui Key Laboratory of Embedded Systems and Service Computing Ministry of Education of the People's Republic of China Tongji University Shanghai 201804 China Department of Computer Science and Technology Tongji University Shanghai 201804 China

ISBN: (纸本)0769528902

Pair-wise testing is a testing criterion based on specification, which requires that for each pair of parameters, every combination of their valid value should be covered by at least one test case in the test set. This paper presents an improved method based on AETG. Experimental results show that the size of test set produced by our method is relatively small. In addition, the method can be easily implemented. © 2007 IEEE.

关键词： Software testing

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Implementation and Analysis of Probabilistic Methods for Gate-Level Circuit Reliability Estimation

Implementation and Analysis of Probabilistic Methods for Gat...

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第十二届全国容错计算学术会议

作者： WANG Zhen JIANG Jianhui YANG Guang Key Laboratory of Embedded Systems and Service Computing Ministry of Education of Shanghai 201804 Department of Computer Science and Technology Tongji UniversityShanghai 201804China

关键词： soft error soft error rate signal reliability failure probability reliability estimation

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A Rough Set Approach to Grouping Goods in Electronic Commerce

A Rough Set Approach to Grouping Goods in Electronic Commerc...

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International Conference on Advanced Communication Technology (ICACT)

作者： Qiguo Duan Duoqian Miao The Key Laboratory of Embedded System and Service Computing Ministry of Education Shanghai China Department of Computer Science and Technology University of Tongji Shanghai China Department ofComputer Science and Technology University of Tongji Shanghai China

As electronic commerce (EC) become more and more prevalent to people, it is very critical to provide the right information to the right customers. The EC sites are generating large amount of data on customer purchases. Data mining techniques in EC domain is currently a hot research area. This paper proposes a rough set based approach to obtaining patterns of goods and classifying associated goods into groups, which can be used by the sites to group their goods according to the customers' preference and adopt appropriate selling policies.

关键词： Electronic commerce Set theory Data mining Computer science Laboratories embedded system embedded computing Web pages Transaction databases Information systems

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Admission Control for Non-preprovisioned service Flow in Wireless Metropolitan Area Networks

Admission Control for Non-preprovisioned Service Flow in Wir...

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European Conference on Universal Multiservice Networks (ECUMN)

作者： Liping Wang Fuqiang Liu Yusheng Ji Nararat Ruangchaijatupon The Key Laboratory of |Embedded System and Service Computing| Ministry of Education China Ministry of Education Tongji University Shanghai China Graduate University of Advanced Studies (SOKENDAI) Tokyo Japan National Institute of Information Japan School of Electronics and Information Engineering University of Tongji Shanghai China The Graduate University for Advanced Studies Tokyo Japan National Institute of Informatics Japan

Improving the admission control process in wireless metropolitan area networks (WMAN) based on the IEEE 802.16e standard can improve the QoS. Because IEEE 802.16e supports five classes of service as well as mobility, an admission control policy for non-preprovisioned service flow is proposed. This policy is compatible with the QoS parameters for each service class defined in the standard. As improvements, the guard channel scheme is used to give handover connections higher priority and a novel proportional bandwidth-borrowing scheme is added to prioritize the different service classes. The simulation results show the proposed admission control policy maximizes the bandwidth utilization and the use of the two schemes provides a reasonable priority order of new originated connections and handover connections of different service classes. The connection-blocking and connection-dropping probabilities were reduced to the extent that they can be ignored

关键词： Admission control Wireless LAN Metropolitan area networks Bandwidth Media Access Protocol Laboratories embedded system embedded computing Informatics Identity management systems

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Single camera 3D lane detection and tracking based on EKF for urban intelligent vehicle

Single camera 3D lane detection and tracking based on EKF fo...

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IEEE International Conference on Vehicular Electronics and Safety, ICVES 2006

作者： Min, Tian Fuqiang, Liu Zhencheng, Hu IEEE Key Laboratory of Embedded System and Service Computing Ministry of Education China Electronic and Information Engineering Department Tongji University Shanghai 201804 China Department of Computer Science Kumamoto University Kumamoto 860-8555 Japan

ISBN: (纸本)1424407591

Road boundary detection and tracking is an important and integral function in advanced driver-assistance system. This paper proposes an algorithm, which can follow multi-kinds of lane, straight and curved, quickly and robustly. The algorithm uses several masks to extract blobs of road markings, combining with KNN function to remove the disturbance. Further more, road is modeled as a 3D surface, and some important parameters of current lane are provided on real-time by tracking based on Extended Kalman Filter (EKF). The results of experiments, which have been done in urban road, show that the algorithm is adapted to many road conditions. Even in a complex driving environment, it also has a good performance. © 2006 IEEE.

关键词： Extended Kalman filters

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