Quanyuan Feng

According to our database, Quanyuan Feng authored at least 97 papers between 2007 and 2024.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of four.

2024

A Novel Single-Stage Semi-Bridgeless CBB-LLC AC-DC Converter.

Junhong Yi, Hongbo Ma, Xiaobin Li, Song Lu, Zhe Chen, Jianping Xu, Quanyuan Feng

IEEE Trans. Ind. Electron., May, 2024

A Novel Single-Stage AC/DC Converter Integrated Interleaved DCM Boost PFC and LLC DC-DC With Reduced Bus Voltage.

Song Lu, Hongbo Ma, Junhong Yi, Zhe Chen, Xiaobin Li, Jianping Xu, Quanyuan Feng

IEEE Trans. Ind. Electron., April, 2024

A Broadband Stepped Configuration of Substrate Integrated Waveguide Vertical Transition Structure.

Haoxuan Sheng, Quanyuan Feng

IEEE Trans. Circuits Syst. II Express Briefs, April, 2024

A Fast Transient LDO Regulator Featuring High PSRR Over 100-kHz Frequency Range With Adaptive, Dynamic Biasing, and Current Mode Feed-Forward Amplifier.

Hua Fan, Lang Feng, Xiaopeng Diao, Xiuhua Xie, Ce Wang, Guo Li, Qi Wei, Fei Qiao, Quanyuan Feng, Edoardo Bonizzoni

IEEE Trans. Circuits Syst. II Express Briefs, April, 2024

2023

Numerical analysis of an ultralow switching loss IGBT with super junction and blocking junction.

Shu Zhao, Quanyuan Feng

Microelectron. J., December, 2023

Modeling of Linear-Nonlinear Behavior in Electrical Contacts With Interaction Interference.

Qiuyan Jin, Quanyuan Feng, Ziren Wang

IEEE Trans. Circuits Syst. II Express Briefs, August, 2023

Capacitor Recombination Algorithm Combined with LMS Algorithm in 16-Bit SAR ADC with Redundancy.

Hua Fan, Yunan Wang, Qi Wei, Quanyuan Feng, Wei Zhou

Circuits Syst. Signal Process., June, 2023

Optimized Split Capacitive Array in 16-Bit SAR ADC with Redundancy.

Hua Fan, Peng Lei, Quanyuan Feng, Qi Wei

Circuits Syst. Signal Process., March, 2023

Correction: Optimized Split Capacitive Array in 16-Bit SAR ADC with Redundancy.

Hua Fan, Peng Lei, Quanyuan Feng, Qi Wei

Circuits Syst. Signal Process., March, 2023

Interdisciplinary Project-Based Learning: Experiences and Reflections From Teaching Electronic Engineering in China.

Hua Fan, Huajiang Xie, Quanyuan Feng, Edoardo Bonizzoni, Hadi Heidari, Michael P. McEwan, Rami Ghannam

IEEE Trans. Educ., February, 2023

A 5th-Order Constant Bandwidth Tunable Bandpass Filter With Two Cascaded Trisection Structures.

Qianyin Xiang, Hongchun Sun, Mingye Fu, Qiuyan Jin, Quanyuan Feng

IEEE Trans. Circuits Syst. II Express Briefs, 2023

Accurate Simulation of High-Gain MMIC Amplifiers With Microstrip-Type Transistors.

Mingye Fu, Nianhua Jiang, Jens Bornemann, Quanyuan Feng

IEEE Trans. Comput. Aided Des. Integr. Circuits Syst., 2023

An Infrared Small Target Detection Algorithm Based on Edge Detection Enhancement.

Beiting Huang, Hua Fan, Guo Li, Hongrui Che, Haizhu Wang, Hongquan Wang, Quanyuan Feng

Proceedings of the IEEE PES Innovative Smart Grid Technologies Europe, 2023

Integrated Circuit Innovative Talents Training under the Background of New Engineering.

Hua Fan, Tianchi Yang, Hongrui Che, Haizhu Wang, Hongquan Wang, Quanyuan Feng

Proceedings of the IEEE International Symposium on Circuits and Systems, 2023

2022

A Valley-Locking Control Scheme for an Audible Noise-Free Valley-Skip-Mode Flyback Converter.

Qiang Wu, Xun Li, Yueyun Han, Zhixiong Di, Quanyuan Feng

IEEE Trans. Ind. Electron., 2022

Implementation of High Precision Error Amplification Scheme for AC-DC Converter.

Qiang Wu, Xun Li, Yongyuan Li, Zhixiong Di, Quanyuan Feng

IEEE Trans. Circuits Syst. II Express Briefs, 2022

A High-Throughput VLSI Architecture Design of Canonical Huffman Encoder.

Zhenyu Shao, Zhixiong Di, Quanyuan Feng, Qiang Wu, Yibo Fan, Xulin Yu, Wenqiang Wang

IEEE Trans. Circuits Syst. II Express Briefs, 2022

Detailed Routing Short Violation Prediction Using Graph-Based Deep Learning Model.

Xuan Chen, Zhixiong Di, Wei Wu, Qiang Wu, Jiangyi Shi, Quanyuan Feng

IEEE Trans. Circuits Syst. II Express Briefs, 2022

NBLG: A Robust Legalizer for Mixed-Cell-Height Modern Design.

Jinwei Chen, Zhixiong Di, Jiangyi Shi, Quanyuan Feng, Qiang Wu

IEEE Trans. Comput. Aided Des. Integr. Circuits Syst., 2022

A 4H-SiC double trench MOSFET with split gate and integrated MPS diode.

Disen Peng, Quanyuan Feng

Microelectron. J., 2022

A novel capacitor recombination calibration method applied to 18-bit SAR ADC.

Hua Fan, Jingxuan Yang, Qi Wei, Quanyuan Feng

Microelectron. J., 2022

Synthetic Aperture Radar Image Compression Based on a Variational Autoencoder.

Qihan Xu, Yunfan Xiang, Zhixiong Di, Yibo Fan, Quanyuan Feng, Qiang Wu, Jiangyi Shi

IEEE Geosci. Remote. Sens. Lett., 2022

Learned Compression Framework With Pyramidal Features and Quality Enhancement for SAR Images.

Zhixiong Di, Xuan Chen, Qiang Wu, Jiangyi Shi, Quanyuan Feng, Yibo Fan

IEEE Geosci. Remote. Sens. Lett., 2022

Design Validation of UWB MIMO Antenna with Enhanced Isolation and Novel Strips for Stop-Band Characteristics.

Muhammad Kabir Khan, Quanyuan Feng

Entropy, 2022

Electronic Circuit Education Innovation: Take Low-pass Filter Teaching as an Example.

Qiang Hu, Shaoyi Hou, Yongneng Xiao, Hua Fan, Wei Zhou, Quanyuan Feng, Xiaopeng Diao, Lang Feng, Jianming Liu

Proceedings of the IEEE International Geoscience and Remote Sensing Symposium, 2022

Exploration on the cultivation of innovative talents in electronic circuit.

Hua Fan, Qianqian Deng, Wei Zhou, Quanyuan Feng, Qiang Hu, Shaoyi Hou, Yongneng Xiao, Xiaopeng Diao, Lang Feng, Jianming Liu

Proceedings of the IEEE International Geoscience and Remote Sensing Symposium, 2022

"Fusion, Interaction, and Training": Cultivating Innovative Leading Talents.

Hua Fan, Kaicong Dong, Xiuhua Xie, Quanyuan Feng, Qiang Hu

Proceedings of the IEEE Asia Pacific Conference on Circuit and Systems, 2022

2021

A Miniaturized LDPC Encoder: Two-Layer Architecture for CCSDS Near-Earth Standard.

Jiaming Liu, Quanyuan Feng

IEEE Trans. Circuits Syst. II Express Briefs, 2021

Modeling and analyzing RFID Generation-2 under unreliable channels.

Yihong Chen, Quanyuan Feng, Xiaolin Jia, Huayue Chen

J. Netw. Comput. Appl., 2021

Modelling of Using Hall Magnetic Sensor for Environmental Monitor of Micrometer-Sized Magnetite Particles.

Hua Fan, Huajiang Xie, Jiangmin Mao, Jianming Liu, Xiaopeng Diao, Qi Wei, Quanyuan Feng

Proceedings of the IEEE International Systems Conference, 2021

Strengthening the Practical Capacity of Students: an Educational Case Study about Teaching Feedback in Electronics Circuit.

Hua Fan, Zonglin Li, Quanyuan Feng, Qi Wei

Proceedings of the IEEE International Systems Conference, 2021

Project-Based Course in Electronic Engineering Education.

Hua Fan, Bochuan Li, Jianming Liu, Qian Shen, Haizhu Wang, Qi Wei, Quanyuan Feng, Hadi Heidari

Proceedings of the IEEE International Symposium on Circuits and Systems, 2021

Design of an All-digital Time Domain Analog-to-digital Converter Based on Ring Delay Line Technology.

Hua Fan, Tongrui Xu, Jianming Liu, Quanyuan Feng

Proceedings of the International Conference on IC Design and Technology, 2021

Calibration method for improving the linearity of analog-to-digital converters in CMOS image sensor.

Hua Fan, Jie Shen, Quanyuan Feng, Qi Wei, Changtao He

Proceedings of the IEEE Asia Pacific Conference on Circuit and Systems, 2021

2020

An implementation of hot-swap circuit with high reliability.

Dagang Li, Zehong Li, Wei Li, Hua Fan, Ce Wang, Hongrui Che, Xuanhong Zeng, Quanyuan Feng, Hadi Heidari

Microelectron. J., 2020

Relay selection schemes in threshold DF cooperative systems with wireless power transfer.

Jin Yao, Jia Ye, Gaofeng Pan, Yiyuan Xie, Quanyuan Feng

J. Frankl. Inst., 2020

Four innovative calibration algorithms for capacitive mismatch in 18-bit redundant split SAR ADC.

Hua Fan, Peng Lei, Quanyuan Feng

Int. J. Circuit Theory Appl., 2020

A local congestion elimination technique driven by overflow.

Wei Wu, Zhixiong Di, Jiangyi Shi, Quanyuan Feng, Zhengguang Tang

IEICE Electron. Express, 2020

Median Selection for Calibrating the Capacitor Mismatch to Improve the Linearity of Analog-to-Digital Converter.

Hua Fan, Chen Wang, Quanyuan Feng

Circuits Syst. Signal Process., 2020

Teaching Embedded Systems for Energy Harvesting Applications: A Comparison of Teaching Methods Adopted in UESTC and KTH.

Hua Fan, Xinjie Wu, Rami Ghannam, Quanyuan Feng, Hadi Heidari, Muhammad Ali Imran

IEEE Access, 2020

High-Precision Adaptive Slope Compensation Circuit for DC-DC Converter in Wearable Devices.

Hua Fan, Weiping Cheng, Quanyuan Feng, Lang Feng, Dagang Li, Xiaopeng Diao, Yuanjun Cen, Hadi Heidari

IEEE Access, 2020

Design of Capacitor Array in 16-Bit Ultra High Precision SAR ADC for the Wearable Electronics Application.

Yuanjun Cen, Wei Feng, Ping Yang, Hua Fan, Yongkai Li, Yi Niu, Zhikai Liao, Xu Qi, Bo Wang, Yan Ran, Wei Li, Quanyuan Feng, Hadi Heidari

IEEE Access, 2020

Contactless 3D Magnetic Field Imaging For Remote Sensing Based On Hall Sensors.

Hua Fan, Jiayi Zhang, Yuanjun Cen, Quanyuan Feng

Proceedings of the 63rd IEEE International Midwest Symposium on Circuits and Systems, 2020

A Horizontal Hall Sensor 3D Comsol Model.

Hua Fan, Sujie Li, Yuanjun Cen, Quanyuan Feng, Hadi Heidari

Proceedings of the 63rd IEEE International Midwest Symposium on Circuits and Systems, 2020

Innovative Engineering Education in Circuits & Systems.

Hua Fan, Jiayi Zhang, Yang Li, Quanyuan Feng, Kaifei Fang, Hao Wen, Lishuang Lin, Xu Qi, Xiaopeng Diao, Edoardo Bonizzoni, Franco Maloberti, Rami Ghannam, Hadi Heidari

Proceedings of the IEEE International Symposium on Circuits and Systems, 2020

FPGA Based Digital Magnetic Field Detection System.

Hua Fan, Jingxuan Yang, Jia Zhang, Ke Zhang, Dezhi Xing, Quanyuan Feng

Proceedings of the IEEE International Geoscience and Remote Sensing Symposium, 2020

Optimization of High Precision SAR ADC Used in the Remote Sensing Technology.

Hua Fan, Jingxuan Yang, Yuanjun Cen, Quanyuan Feng

Proceedings of the IEEE International Geoscience and Remote Sensing Symposium, 2020

Improving Student Learning of Sensor Related Courses Using Innovative Projects.

Hua Fan, Jiangming Wang, Dezhi Xing, Ke Zhang, Jia Zhang, Quanyuan Feng

Proceedings of the IEEE International Geoscience and Remote Sensing Symposium, 2020

A Fast Transient Response and High PSR Low Drop-Out Voltage Regulator.

Yang Li, Hua Fan, Quanyuan Feng, Qiang Hu, Lang Hu, Hao Chen, Hadi Heidari

Proceedings of the 27th IEEE International Conference on Electronics, Circuits and Systems, 2020

Capacitive recombination calibration method to improve the performance of SAR ADC.

Hua Fan, Xinjie Wu, Quanyuan Feng, Ke Zhang, Jia Zhang

Proceedings of the 2020 IEEE Asia Pacific Conference on Circuits and Systems, 2020

"Truth from Practice, Learning beyond Teaching" Exploration in Teaching Analog Integrated Circuit.

Hua Fan, Xiaohu Qi, Quanyuan Feng

Proceedings of the 2020 IEEE Asia Pacific Conference on Circuits and Systems, 2020

2019

A Collision Avoidance Identification Algorithm for Mobile RFID Device.

Yihong Chen, Quanyuan Feng

IEEE Trans. Consumer Electron., 2019

An External Capacitor-Less Low-Dropout Voltage Regulator Using a Transconductance Amplifier.

Hua Fan, Xiaopeng Diao, Yongkai Li, Kaifei Fang, Hao Wen, Dagang Li, Kelin Zhang, Yuanjun Cen, Dainan Zhang, Quanyuan Feng, Hadi Heidari

IEEE Trans. Circuits Syst. II Express Briefs, 2019

Design novel structure of high-voltage MOSFET with double trench gates.

Hong-Jin Yang, Tao Jin, Quanyuan Feng

Microelectron. J., 2019

Innovations of Microcontroller Unit Based on Experiment.

Hua Fan, Yang Liu, Guoqin Yin, Quanyuan Feng, Yi Niu, Hongrui Che, Xuanhong Zeng, Qian Shen, Xiuhua Xie, Xiang He, Weijian Chen, Hadi Heidari

Proceedings of the IEEE International Symposium on Circuits and Systems, 2019

High-Precision Adaptive Slope Compensation Circuit for System-on-Chip Power Management.

Hua Fan, Kelin Zhang, Yuanjun Cen, Kaung Oo Htet, Hadi Heidari, Weiping Cheng, Yang Li, Quanyuan Feng, Hongrui Che, Xuanhong Zeng, Haizhu Wang, Hongquan Wang, Dagang Li

Proceedings of the 38th IEEE International Performance Computing and Communications Conference, 2019

Design Considerations of Data Converters for Industrial Technology.

Hua Fan, Jiayi Zhang, Jingwei Cai, Quanyuan Feng, Dagang Li, Kelin Zhang, Daqian Hu, Dezhi Xing, Hongrui Che, Yuanjun Cen, Hadi Heidari

Proceedings of the International Conference on IC Design and Technology, 2019

2018

A 4-Channel 12-Bit High-Voltage Radiation-Hardened Digital-to-Analog Converter for Low Orbit Satellite Applications.

Hua Fan, Dagang Li, Kelin Zhang, Yuanjun Cen, Quanyuan Feng, Fei Qiao, Hadi Heidari

IEEE Trans. Circuits Syst. I Regul. Pap., 2018

Synthesis Applied 4^th-Order Constant Absolute Bandwidth Frequency-Agile Bandpass Filter With Cross-Coupling.

Dengyao Tian, Quanyuan Feng, Qianyin Xiang

IEEE Access, 2018

Exploiting Smallest Error to Calibrate Non-Linearity in SAR Adcs.

Hua Fan, Jingtao Li, Quanyuan Feng, Xiaopeng Diao, Lishuang Lin, Kelin Zhang, Haiding Sun, Hadi Heidari

IEEE Access, 2018

High-Resolution ADCs for Biomedical Imaging Systems.

Hua Fan, Xinjie Wu, Tao Zhang, Quanyuan Feng, Lang Feng, Dagang Li, Kelin Zhang, Daqian Hu, Yuanjun Cen, Hadi Heidari

Proceedings of the 2018 New Generation of CAS, 2018

A Bit Cycling Method for Improving the DNL/INL in Successive Approximation Register (SAR) Analog-to-Digital Converter (ADC).

Hua Fan, Chen Wang, Hailiang Xiong, Quanyuan Feng, Dagang Li, Kelin Zhang, Xiaopeng Diao, Lishuang Lin, Hadi Heidari

Proceedings of the 2018 New Generation of CAS, 2018

High-resolution ADCs design in sensors.

Hua Fan, Jingxuan Yang, Franco Maloberti, Quanyuan Feng, Dagang Li, Daqian Hu, Yuanjun Cen, Hadi Heidari

Proceedings of the 9th IEEE Latin American Symposium on Circuits & Systems, 2018

High Linearity SAR ADC for High Performance Sensor System.

Hua Fan, Jingxuan Yang, Franco Maloberti, Quanyuan Feng, Dagang Li, Daqian Hu, Yuanjun Cen, Hadi Heidari

Proceedings of the IEEE International Symposium on Circuits and Systems, 2018

Promoting engineering education by scientific research.

Hua Fan, Weijian Chen, Yulan Li, Jin Zhang, Xingning Ye, Quanyuan Feng

Proceedings of the 2018 IEEE Global Engineering Education Conference, 2018

Reform and Practice of Analog Circuits.

Hua Fan, Sujie Li, Shuhan Yang, Quanyuan Feng, Weijian Chen, Xingning Ye, Shimeng Xie, Hadi Heidari

Proceedings of the 2018 IEEE Asia Pacific Conference on Circuits and Systems, 2018

2017

Secrecy Outage Analysis on Underlay Cognitive Radio System With Full-Duplex Secondary User.

Chao Zhang, Danyang Wang, Jia Ye, Hongjiang Lei, Jiliang Zhang, Gaofeng Pan, Quanyuan Feng

IEEE Access, 2017

Design of Sensor System for Air Pollution Monitoring.

Hua Fan, Junru Li, Yulin Qin, Quanyuan Feng, Dagang Li, Daqian Hu, Yuanjun Cen, Hadi Heidari

Proceedings of the Geo-Spatial Knowledge and Intelligence - 5th International Conference, 2017

2015

An improved anti-collision protocol for radio frequency identification tag.

Xiaolin Jia, Quanyuan Feng

Int. J. Commun. Syst., 2015

LC-KO: A congestion-aware and area&timing-oriented placement method.

Zhixiong Di, Yanlong Wang, Shuang Qiao, Qianyin Xiang, Quanyuan Feng

Proceedings of the 2015 IEEE 11th International Conference on ASIC, 2015

2014

Performance Analysis of Multi-Branch Multi-Hop Wireless Relay Systems over Log-Normal Channels.

Gaofeng Pan, Eylem Ekici, Quanyuan Feng

IEEE Trans. Wirel. Commun., 2014

A Parallel Dual Matrix Method for Blind Signal Separation.

Tiao Jun Zeng, Quanyuan Feng

Neural Comput., 2014

Failure analysis and improvement of 60 V power UMOSFET.

Debo Wang, Quanyuan Feng, Xiaopei Chen, Tao Jin

Microelectron. Reliab., 2014

An Efficient Anti-collision Algorithm for the EPCglobal Class-1 Generation-2 System under the Dynamic Environment.

Yihong Chen, Quanyuan Feng

KSII Trans. Internet Inf. Syst., 2014

Performance analysis of interference-limited cooperative systems with relay selection over independent log-normal fading channels.

Gaofeng Pan, Yunfei Chen, Quanyuan Feng

IET Commun., 2014

2013

Multiple-bits-slot reservation aloha protocol for tag identification.

Yihong Chen, Quanyuan Feng, Ma Zheng, Liu Tao

IEEE Trans. Consumer Electron., 2013

A universal-input high-power-factor power supply without electrolytic capacitor for multiple lighting LED lamps.

Hongbo Ma, Jih-Sheng (Jason) Lai, Quanyuan Feng, Wensong Yu, Cong Zheng

Int. J. Circuit Theory Appl., 2013

A Improved EPC Class 1 Gen 2 Protocol with FCFS Feature in the Mobile RFID Systems.

Xiaowu Li, Quanyuan Feng

Int. J. Comput. Commun. Control, 2013

An asymmetric coplanar waveguide (ACPW) resonant antenna based on the composite right/left-handed transmission line.

Shengjun Wei, Quanyuan Feng

Sci. China Inf. Sci., 2013

2012

Performance Analysis of Cooperative Time Hopping UWB Systems with Multi-User Interference.

Gaofeng Pan, Eylem Ekici, Quanyuan Feng

IEEE Trans. Wirel. Commun., 2012

Stability Analysis of an Efficient Anti-Collision Protocol for RFID Tag Identification.

Xiaolin Jia, Quanyuan Feng, Lishan Yu

IEEE Trans. Commun., 2012

Capacity Analysis of Log-Normal Channels Under Various Adaptive Transmission Schemes.

Gaofeng Pan, Eylem Ekici, Quanyuan Feng

IEEE Commun. Lett., 2012

Outage analysis of cooperative TH UWB systems.

Gaofeng Pan, Eylem Ekici, Yunfei Chen, Quanyuan Feng

Proceedings of the 2012 1st IEEE International Conference on Communications in China (ICCC), 2012

2011

A new differential mutation base generator for differential evolution.

Chuan Lin, Anyong Qing, Quanyuan Feng

J. Glob. Optim., 2011

High-Gain Array Antenna Based on Composite Right/Left-Handed Transmission Line.

Ningli Zhu, Quanyuan Feng, Zhiang Wu

Int. J. Commun. Netw. Syst. Sci., 2011

Correction to 'BER Analysis of Threshold Digital Relaying Schemes over Log-Normal Fading Channels' [Jul 11 731-733].

Gaofeng Pan, Eylem Ekici, Quanyuan Feng

IEEE Commun. Lett., 2011

BER Analysis of Threshold Digital Relaying Schemes over Log-Normal Fading Channels.

Gaofeng Pan, Eylem Ekici, Quanyuan Feng

IEEE Commun. Lett., 2011

A comparative study of crossover in differential evolution.

Chuan Lin, Anyong Qing, Quanyuan Feng

J. Heuristics, 2011

2010

An Efficient Anti-Collision Protocol for RFID Tag Identification.

Xiaolin Jia, Quanyuan Feng, Chengzhen Ma

IEEE Commun. Lett., 2010

A novel patch antenna for UHF band RFID tag.

Jingmin Yan, Quanyuan Feng, Chao Li, Qingdong Li

Proceedings of the 7th International Conference on Wireless and Optical Communications Networks, 2010

A tunable internal antenna based on composite right/left handed transmission line for mobile handset application.

Zhiang Wu, Quanyuan Feng, Shuangxi Liu

Proceedings of the 7th International Conference on Wireless and Optical Communications Networks, 2010

Design of a frequency-tunable dual-band planar monopole antenna for handheld terminals.

Shuangxi Liu, Quanyuan Feng, Zhiang Wu

Proceedings of the 7th International Conference on Wireless and Optical Communications Networks, 2010

Design and analysis of ferrite loaded improved slot PIFA antenna.

Qingdong Li, Quanyuan Feng, Jingmin Yan

Proceedings of the 7th International Conference on Wireless and Optical Communications Networks, 2010

2009

Synthesis of unequally Spaced Antenna Arrays by a new Differential Evolutionary Algorithm.

Chuan Lin, Anyong Qing, Quanyuan Feng

Int. J. Commun. Networks Inf. Secur., 2009

An Optimal Power Control Scheme in Low Rate UWB WSNs.

Gaofeng Pan, Quanyuan Feng

Proceedings of the CSIE 2009, 2009 WRI World Congress on Computer Science and Information Engineering, March 31, 2009

2007

Grouping based bit-slot ALOHA protocol for tag anti-collision in RFID systems.

C. P. Wong, Quanyuan Feng

IEEE Commun. Lett., 2007

The Standard Particle Swarm Optimization Algorithm Convergence Analysis and Parameter Selection.

Chuan Lin, Quanyuan Feng

Proceedings of the Third International Conference on Natural Computation, 2007