Bo Wan

ORCID

Publication Activity (10 Years)

Years Active: 2003-2024
Publications (10 Years): 110

Top Venues

CoRR

Remote. Sens.

IEEE Access

IEEE Trans. Instrum. Meas.

Publications

Bo Wan, Michael Tschannen, Yongqin Xian, Filip Pavetic, Ibrahim Alabdulmohsin, Xiao Wang, André Susano Pinto, Andreas Steiner, Lucas Beyer, Xiaohua Zhai
LocCa: Visual Pretraining with Location-aware Captioners. CoRR (2024)
Xiao Liang, Di Wang, Haodi Zhong, Quan Wang, Ronghan Li, Rui Jia, Bo Wan
Candidate-Heuristic In-Context Learning: A new framework for enhancing medical visual question answering with LLMs. Inf. Process. Manag. 61 (5) (2024)
Yu Tang, Shangqi Guo, Jinhui Liu, Bo Wan, Lingling An, Jian K. Liu
Hierarchical reinforcement learning from imperfect demonstrations through reachable coverage-based subgoal filtering. Knowl. Based Syst. 294 (2024)
Xuemei Luo, Xiaotong Luo, Di Wang, Jinhui Liu, Bo Wan, Lin Zhao
Global semantic enhancement network for video captioning. Pattern Recognit. 145 (2024)
Haiwen Diao, Bo Wan, Xu Jia, Yunzhi Zhuge, Ying Zhang, Huchuan Lu, Long Chen
SHERL: Synthesizing High Accuracy and Efficient Memory for Resource-Limited Transfer Learning. CoRR (2024)
Mingxiao Li, Bo Wan, Marie-Francine Moens, Tinne Tuytelaars
Animate Your Motion: Turning Still Images into Dynamic Videos. CoRR (2024)
Bo Wan, Tinne Tuytelaars
Exploiting CLIP for Zero-shot HOI Detection Requires Knowledge Distillation at Multiple Levels. WACV (2024)
Yifeng Wang, Jiahao He, Di Wang, Quan Wang, Bo Wan, Xuemei Luo
Multimodal transformer with adaptive modality weighting for multimodal sentiment analysis. Neurocomputing 572 (2024)
Hao Li, Rong Pan, Gang Liu, Min Dang, Qijie Xu, Xu Wang, Bo Wan
TIR-Net: Task Integration Based on Rotated Convolution Kernel for Oriented Object Detection in Aerial Images. IEEE Trans. Geosci. Remote. Sens. 62 (2024)
Runnan Zhang, Gang Liu, Hongzhaoning Kang, Quan Wang, Bo Wan, Nan Luo
Anonymity in Attribute-Based Access Control: Framework and Metric. IEEE Trans. Dependable Secur. Comput. 21 (1) (2024)
Bang Xiong, Bo Wan, Jiayang Huang, Fengqi Li, Xintai Li, Pengfei Yang
Cross-Stimulus Transfer Method Using Common Impulse Response for Fast Calibration of SSVEP-Based BCIs. IEEE Trans. Instrum. Meas. 73 (2024)
Xiaozhu Gao, Jinhui Liu, Bo Wan, Lingling An
Hierarchical Reinforcement Learning from Demonstration via Reachability-Based Reward Shaping. Neural Process. Lett. 56 (3) (2024)
Hui Zhao, Nanzhi Feng, Jianhua Li, Guobin Zhang, Jing Wang, Quan Wang, Bo Wan
VM performance-aware virtual machine migration method based on ant colony optimization in cloud environment. J. Parallel Distributed Comput. 176 (2023)
Bo Wan, Shuai Dong, Deping Chu, Hong Li, Yiyang Liu, Jinming Fu, Fang Fang, Shengwen Li, Dan Zhou
A deep neural network model for coreference resolution in geological domain. Inf. Process. Manag. 60 (3) (2023)
Ying Xu, Chuan-Shun Wei, Chao Yuan, Yumeng Zhang, Tao Li, Bo Wan, Ziqiang Cui
A Detection Method for Vortex Precession Frequency Based on MEMS Three-Axis Acceleration Sensor. IEEE Trans. Instrum. Meas. 72 (2023)
Shunping Zhou, Yuting Feng, Shengwen Li, Daoyuan Zheng, Fang Fang, Yuanyuan Liu, Bo Wan
DSM-Assisted Unsupervised Domain Adaptive Network for Semantic Segmentation of Remote Sensing Imagery. IEEE Trans. Geosci. Remote. Sens. 61 (2023)
Lucas Beyer, Bo Wan, Gagan Madan, Filip Pavetic, Andreas Steiner, Alexander Kolesnikov, André Susano Pinto, Emanuele Bugliarello, Xiao Wang, Qihang Yu, Liang-Chieh Chen, Xiaohua Zhai
A Study of Autoregressive Decoders for Multi-Tasking in Computer Vision. CoRR (2023)
Yumin Tian, Yuanbo Li, Di Wang, Xiao Liang, Ronghua Zhang, Bo Wan
Enhancing CLIP-Based Text-Person Retrieval by Leveraging Negative Samples. PRCV (7) (2023)
Haiwen Diao, Bo Wan, Ying Zhang, Xu Jia, Huchuan Lu, Long Chen
UniPT: Universal Parallel Tuning for Transfer Learning with Efficient Parameter and Memory. CoRR (2023)
Yumin Tian, Aqiang Ding, Di Wang, Xuemei Luo, Bo Wan, Yifeng Wang
Bi-Attention enhanced representation learning for image-text matching. Pattern Recognit. 140 (2023)
Xiao Liang, Di Wang, Quan Wang, Bo Wan, Lingling An, Lihuo He
Language-Guided Visual Aggregation Network for Video Question Answering. ACM Multimedia (2023)
Fang Fang, Jiahui Zhang, Shengwen Li, Daoyuan Zheng, Linyun Zeng, Bo Wan
Spatial Extent-Aware Multimodal Fusion Method for Measuring Urban Socioeconomic Status. IGARSS (2023)
Fang Fang, Rui Xu, Shengwen Li, Qingyi Hao, Kang Zheng, Kaishun Wu, Bo Wan
Semisupervised Building Instance Extraction From High-Resolution Remote Sensing Imagery. IEEE Trans. Geosci. Remote. Sens. 61 (2023)
Bo Wan, Yongfei Liu, Desen Zhou, Tinne Tuytelaars, Xuming He
Weakly-supervised HOI Detection via Prior-guided Bi-level Representation Learning. ICLR (2023)
Shaofeng Li, Tingyu Wang, Bo Wan
A Task Scheduling Algorithm for Micro-cloud Platform Based on Task Real-time. CNCIT (2023)
Hong Li, Bo Wan, Deping Chu, Run Wang, Guoxi Ma, Jinming Fu, Zhuocheng Xiao
Progressive Geological Modeling and Uncertainty Analysis Using Machine Learning. ISPRS Int. J. Geo Inf. 12 (3) (2023)
Lirong Zhou, Junjun Wang, Zhao Huang, Lu Fan, Quan Wang, Jinhui Liu, Bo Wan
A Logic Encryption-Enhanced PUF Architecture to Deceive Machine Learning-Based Modeling Attacks. ATS (2023)
Daoyuan Zheng, Shengwen Li, Fang Fang, Jiahui Zhang, Yuting Feng, Bo Wan, Yuanyuan Liu
Utilizing Bounding Box Annotations for Weakly Supervised Building Extraction From Remote-Sensing Images. IEEE Trans. Geosci. Remote. Sens. 61 (2023)
Bo Wan, Yongfei Liu, Desen Zhou, Tinne Tuytelaars, Xuming He
Weakly-supervised HOI Detection via Prior-guided Bi-level Representation Learning. CoRR (2023)
Bo Wan, Tinne Tuytelaars
Exploiting CLIP for Zero-shot HOI Detection Requires Knowledge Distillation at Multiple Levels. CoRR (2023)
Jiayang Huang, Pengfei Yang, Bang Xiong, Quan Wang, Bo Wan, Ziling Ruan, Keyi Yang, Zhiqiang Zhang
Incorporating Neighboring Stimuli Data for Enhanced SSVEP-Based BCIs. IEEE Trans. Instrum. Meas. 71 (2022)
Fang Fang, Daoyuan Zheng, Shengwen Li, Yuanyuan Liu, Linyun Zeng, Jiahui Zhang, Bo Wan
Improved Pseudomasks Generation for Weakly Supervised Building Extraction From High-Resolution Remote Sensing Imagery. IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens. 15 (2022)
Bang Xiong, Jiayang Huang, Bo Wan, Changhua Jiang, Kejia Su, Fei Wang
A High-Speed SSVEP-Based Speller Using Continuous Spelling Method. ICONIP (4) (2022)
Bo Wan, Junjun Dang, Xuanxuan Liu, Qi Wang
Micro-Expression Recognition Based on MAML Meta-Learning Algorithm. SmartWorld/UIC/ScalCom/DigitalTwin/PriComp/Meta (2022)
Gang Liu, Ziwen Tang, Bo Wan, Yanfei Li, Yan Liu
Differential privacy location data release based on quadtree in mobile edge computing. Trans. Emerg. Telecommun. Technol. 33 (6) (2022)
Deping Chu, Bo Wan, Hong Li, Shuai Dong, Jinming Fu, Yiyang Liu, Kuan Huang, Hui Liu
A machine learning approach to extracting spatial information from geological texts in Chinese. Int. J. Geogr. Inf. Sci. 36 (11) (2022)
Bo Wan, Wenjuan Han, Zilong Zheng, Tinne Tuytelaars
Unsupervised Vision-Language Grammar Induction with Shared Structure Modeling. ICLR (2022)
Qingfan Zhang, Maosheng Hu, Yansong Zhou, Bo Wan, Le Jiang, Quanfa Zhang, Dezhi Wang
Effects of UAV-LiDAR and Photogrammetric Point Density on Tea Plucking Area Identification. Remote. Sens. 14 (6) (2022)
Nan Luo, Ying Xu, Quan Wang, Bo Wan
Retrieving point cloud models of target objects in a scene from photographed images. Multim. Tools Appl. 80 (4) (2021)
Yuanyuan Liu, Wei Dai, Fang Fang, Yongquan Chen, Rui Huang, Run Wang, Bo Wan
Dynamic multi-channel metric network for joint pose-aware and identity-invariant facial expression recognition. Inf. Sci. 578 (2021)
Hui Zhao, Fanxin Meng, Nanzhi Feng, Quan Wang, Bo Wan, Jing Wang
An Energy-Efficient Task Scheduling Strategy Based on Improved Fireworks Algorithm in Heterogeneous Cloud. HPCC/DSS/SmartCity/DependSys (2021)
Rongjie Li, Songyang Zhang, Bo Wan, Xuming He
Bipartite Graph Network With Adaptive Message Passing for Unbiased Scene Graph Generation. CVPR (2021)
Bo Wan, Bang Xiong, Jiayang Huang, Pengfei Yang
A Novel SSVEP-based Word Speller Based on Sliding Multi-Window Strategy. BCI (2021)
Qian He, Desen Zhou, Bo Wan, Xuming He
Single Image 3D Object Estimation with Primitive Graph Networks. ACM Multimedia (2021)
Qiao Hua, Yaqin Ye, Bo Wan, Bo Chen, Yingqiang Zhong, Jiao Pan
An Interpretable Model for ECG Data Based on Bayesian Neural Networks. IEEE Access 9 (2021)
Yongfei Liu, Bo Wan, Lin Ma, Xuming He
Relation-aware Instance Refinement for Weakly Supervised Visual Grounding. CoRR (2021)
Qian He, Desen Zhou, Bo Wan, Xuming He
Single Image 3D Object Estimation with Primitive Graph Networks. CoRR (2021)
Jun Luo, Shukai Guan, Bo Wan, Maogong Jiang, Guicui Fu
Research on IGBT Bonding Wires Crack Propagation at the Macro and Micro Scales. IEEE Access 9 (2021)
Fang Fang, Kaishun Wu, Yuanyuan Liu, Shengwen Li, Bo Wan, Yanling Chen, Daoyuan Zheng
A Coarse-to-Fine Contour Optimization Network for Extracting Building Instances from High-Resolution Remote Sensing Imagery. Remote. Sens. 13 (19) (2021)
Lei Gao, Bo Wan, Gang Liu, Guojun Xie, Jiayang Huang, Guanglan Meng
Investigating the Effectiveness of Virtual Reality for Culture Learning. Int. J. Hum. Comput. Interact. 37 (18) (2021)
Hui Zhao, Quan Wang, Jing Wang, Bo Wan, Zili Wu
Popularity-Based and Version-Aware Caching Scheme at Edge Servers for Multi-Version VoD Systems. IEEE Trans. Circuits Syst. Video Technol. 31 (3) (2021)
Ye Wang, Bo Wan, Guicui Fu, Yutai Su
PRNU Estimation of Linear CMOS Image Sensors That Allows Nonuniform Illumination. IEEE Trans. Instrum. Meas. 70 (2021)
Gang Liu, Hongzhaoning Kang, Quan Wang, Yumin Tian, Bo Wan
Contourlet-CNN for SAR Image Despeckling. Remote. Sens. 13 (4) (2021)
Fang Fang, Yafang Yu, Shengwen Li, Zejun Zuo, Yuanyuan Liu, Bo Wan, Zhongwen Luo
Synthesizing location semantics from street view images to improve urban land-use classification. Int. J. Geogr. Inf. Sci. 35 (9) (2021)
Hui Zhao, Nanzhi Feng, Fanxin Meng, Quan Wang, Bo Wan, Jing Wang
A Mapping-based Dynamic Semi-Online Task Scheduling Method for Minimizing Energy in Edge Computing. HPCC/DSS/SmartCity/DependSys (2021)
Rongjie Li, Songyang Zhang, Bo Wan, Xuming He
Bipartite Graph Network with Adaptive Message Passing for Unbiased Scene Graph Generation. CoRR (2021)
Gang Liu, Quan Wang, Lianqin Wu, Rong Pan, Bo Wan, Yumin Tian
Zero-watermarking method for resisting rotation attacks in 3D models. Neurocomputing 421 (2021)
Yongfei Liu, Bo Wan, Lin Ma, Xuming He
Relation-aware Instance Refinement for Weakly Supervised Visual Grounding. CVPR (2021)
Bo Wan, Qi Wang, Kejia Su, Caiyu Dong, Wenjing Song, Min Pang
Measuring the Impacts of Virtual Reality Games on Cognitive Ability Using EEG Signals and Game Performance Data. IEEE Access 9 (2021)
Yongfei Liu, Bo Wan, Xiaodan Zhu, Xuming He
Learning Cross-Modal Context Graph for Visual Grounding. AAAI (2020)
Jian Pu, Ren-bin Yu, Jian-hua Wang, Bo Wan, Jian-xia Luo, Shuqing Tian
POD analysis of passage-layout effect on unsteady internal flow in a realistic blade serpentine coolant channel with low aspect ratios. J. Vis. 23 (5) (2020)
Pengfei Yang, Jiayang Huang, Xin Mi, Bo Wan
A Memory Confidentiality Protection Scheme Based on Dynamic Keys and Compression Counter. J. Inf. Sci. Eng. 36 (4) (2020)
Bo Wan, Jiale Dang, Zhetao Li, Hongfang Gong, Feng Zhang, Sangyoon Oh
Modeling Analysis and Cost-Performance Ratio Optimization of Virtual Machine Scheduling in Cloud Computing. IEEE Trans. Parallel Distributed Syst. 31 (7) (2020)
Xueqin Guo, Fengzhen Chen, Fei Gao, Ling Li, Ke Liu, Lijin You, Cong Hua, Fan Yang, Wanliang Liu, Chunhua Peng, Lina Wang, Xiaoxia Yang, Feiyu Zhou, Jiawei Tong, Jia Cai, Zhiyong Li, Bo Wan, Lei Zhang, Tao Yang, Minwen Zhang, Linlin Yang, Yawen Yang, Wenjun Zeng, Bo Wang, Xiaofeng Wei, Xun Xu
CNSA: a data repository for archiving omics data. Database J. Biol. Databases Curation 2020 (2020)
Dezhi Wang, Bo Wan, Jing Liu, Yanjun Su, Qinghua Guo, Penghua Qiu, Xincai Wu
Estimating aboveground biomass of the mangrove forests on northeast Hainan Island in China using an upscaling method from field plots, UAV-LiDAR data and Sentinel-2 imagery. Int. J. Appl. Earth Obs. Geoinformation 85 (2020)
Ping Jiang, Bo Wan, Quan Wang, Jian Wu
Fast and Efficient Facial Expression Recognition Using a Gabor Convolutional Network. IEEE Signal Process. Lett. 27 (2020)
Gang Liu, Runnan Zhang, Bo Wan, Shaomin Ji, Yumin Tian
Extended Role-Based Access Control with Context-Based Role Filtering. KSII Trans. Internet Inf. Syst. 14 (3) (2020)
Hui Zhao, Quan Wang, Jing Wang, Bo Wan, Shangshu Li
VM Performance Maximization and PM Load Balancing Virtual Machine Placement in Cloud. CCGRID (2020)
Bo Wan, Ye Wang, Yutai Su, Guicui Fu
Reliability Evaluation of Multi-Mechanism Failure for Semiconductor Devices Using Physics-of-Failure Technique and Maximum Entropy Principle. IEEE Access 8 (2020)
Fei Sun, Fang Fang, Run Wang, Bo Wan, Qinghua Guo, Hong Li, Xincai Wu
An Impartial Semi-Supervised Learning Strategy for Imbalanced Classification on VHR Images. Sensors 20 (22) (2020)
Wenjie Zhen, Lin Yang, Mei-Po Kwan, Zejun Zuo, Bo Wan, Shunping Zhou, Shengwen Li, Yaqin Ye, Haoyue Qian, Xiaofang Pan
Capturing what human eyes perceive: A visual hierarchy generation approach to emulating saliency-based visual attention for grid-like urban street networks. Comput. Environ. Urban Syst. 80 (2020)
Wei Yang, Bo Wan, Xiaolei Qu
A Forward Collision Warning System Using Driving Intention Recognition of the Front Vehicle and V2V Communication. IEEE Access 8 (2020)
Dan-Ping Zhang, Ding-Shuai Xue, Yan-Hong Liu, Bo Wan, Qian Guo, Ju-Jie Guo
Comparative Study of Three Mixing Methods in Fusion Technique for Determining Major and Minor Elements Using Wavelength Dispersive X-ray Fluorescence Spectroscopy. Sensors 20 (18) (2020)
Bo Wan, Desen Zhou, Yongfei Liu, Rongjie Li, Xuming He
Pose-Aware Multi-Level Feature Network for Human Object Interaction Detection. ICCV (2019)
Shuo Gao, Yanning Dai, Vasileios Kitsos, Bo Wan, Xiaolei Qu
High Three-Dimensional Detection Accuracy in Piezoelectric-Based Touch Panel in Interactive Displays by Optimized Artificial Neural Networks. Sensors 19 (4) (2019)
Yumin Tian, Chenhui Peng, Di Wang, Bo Wan
High confidence detection for moving target in aerial video. IET Image Process. 13 (14) (2019)
Fei Sun, Run Wang, Bo Wan, Yanjun Su, Qinghua Guo, Youxin Huang, Xincai Wu
Efficiency of Extreme Gradient Boosting for Imbalanced Land Cover Classification Using an Extended Margin and Disagreement Performance. ISPRS Int. J. Geo Inf. 8 (7) (2019)
Pengfei Yang, Jiayang Huang, Xin Mi, Bo Wan
An Integrity Protection Scheme Based on Binary Multi-granularity Incremental Tree for Embedded Computing Platform. NaNA (2019)
Yongfei Liu, Bo Wan, Xiaodan Zhu, Xuming He
Learning Cross-modal Context Graph for Visual Grounding. CoRR (2019)
Di Wang, Bin Shang, Quan Wang, Bo Wan
Semi-paired and semi-supervised multimodal hashing via cross-modality label propagation. Multim. Tools Appl. 78 (17) (2019)
Dezhi Wang, Bo Wan, Penghua Qiu, Zejun Zuo, Run Wang, Xincai Wu
Mapping Height and Aboveground Biomass of Mangrove Forests on Hainan Island Using UAV-LiDAR Sampling. Remote. Sens. 11 (18) (2019)
Bo Wan, Xi Li, Bo Zhang, Caixu Zhao, Xianglan Chen, Chao Wang, Xuehai Zhou
DCW: A Reactive and Predictable Programming Framework for LET-Based Distributed Real-Time Systems. ACM Trans. Design Autom. Electr. Syst. 24 (3) (2019)
Lei Gao, Bo Wan, Cheng Fang, Yangyang Li, Chen Chen
Automatic Clustering of Different Solutions to Programming Assignments in Computing Education. CompEd (2019)
Bo Wan, Desen Zhou, Yongfei Liu, Rongjie Li, Xuming He
Pose-aware Multi-level Feature Network for Human Object Interaction Detection. CoRR (2019)
Yumin Tian, Qiang Li, Di Wang, Bo Wan
Robust joint learning network: improved deep representation learning for person re-identification. Multim. Tools Appl. 78 (17) (2019)
Guicui Fu, Yutai Su, Wendi Guo, Bo Wan, Zhongqing Zhang, Ye Wang
Life prediction methodology of system-in-package based on physics of failure. Microelectron. Reliab. (2018)
Kaiqi Zhou, Bo Wan, X. I. Li, B. O. Zhang, Caixu Zhao, Chao Wang
Supporting Predictable Servant-Based Execution Model on Multicore Platforms. HPCC/SmartCity/DSS (2018)
Li Yu, Peiyuan Qiu, Xiliang Liu, Feng Lu, Bo Wan
A holistic approach to aligning geospatial data with multidimensional similarity measuring. Int. J. Digit. Earth 11 (8) (2018)
Dezhi Wang, Bo Wan, Penghua Qiu, Yanjun Su, Qinghua Guo, Xincai Wu
Artificial Mangrove Species Mapping Using Pléiades-1: An Evaluation of Pixel-Based and Object-Based Classifications with Selected Machine Learning Algorithms. Remote. Sens. 10 (2) (2018)
Bo Wan, Lin Yang, Shunping Zhou, Run Wang, Dezhi Wang, Wenjie Zhen
A Parallel-Computing Approach for Vector Road-Network Matching Using GPU Architecture. ISPRS Int. J. Geo Inf. 7 (12) (2018)
Dezhi Wang, Bo Wan, Penghua Qiu, Yanjun Su, Qinghua Guo, Run Wang, Fei Sun, Xincai Wu
Evaluating the Performance of Sentinel-2, Landsat 8 and Pléiades-1 in Mapping Mangrove Extent and Species. Remote. Sens. 10 (9) (2018)
Bo Wan, Bo Zhang, Xi Li, Kaiqi Zhou, Caixu Zhao, Chao Wang, Xuehai Zhou
: a real-time testbed for empirically comparing real-time multicore schedulers: work-in-progress. EMSOFT (2018)
Lei Wang, Quan Wang, Di Wang, Bo Wan, Bin Shang
Online Matrix Factorization Hashing for Large-Scale Image Retrieval. Big Data (CCF) (2018)
Ling Guo, Bo Wan, Changlong Li, Kaiqi Zhou, Xi Li
A Flow-Grained End-to-End Delay Analysis for RC Traffic in TTEthernet. COMPSAC (1) (2018)
Chao Wang, Yuming Cheng, Lei Gong, Bo Wan, Aili Wang, Xi Li, Xuehai Zhou
FPGA Based Big Data Accelerator Design in Teaching Computer Architecture and Organization. CyPhy (2017)
Bo Wan, Xi Li, Haizhao Luo, Chao Wang, Xianglan Chen, Xuehai Zhou
Work-in-Progress: TTI: A Timing ISA for LET Model in Safety-Critical Systems. RTSS (2017)
Run Wang, Bo Wan, Qinghua Guo, Maosheng Hu, Shunping Zhou
Mapping Regional Urban Extent Using NPP-VIIRS DNB and MODIS NDVI Data. Remote. Sens. 9 (8) (2017)
Xi Li, Beilei Sun, Bo Wan, Xianglan Chen, Xuehai Zhou
安全关键信息物理系统的时序可预测性 (Temporal Predictability in Safety Critical Cyber Physical System). 计算机科学 44 (Z11) (2017)
Bo Wan, Xi Li, Kaiqi Zhou, Haizhao Luo, Chao Wang, Xianglan Chen, Xuehai Zhou
Clockwerk: A Predictable and Efficient Extension of Logical Execution Time Model. APSEC (2017)
Bo Wan, Rongrong Wu, Kaihuo Zhang, Lanxin Liu
A new subtle hand gestures recognition algorithm based on EMG and FSR. CSCWD (2017)

Bo Wan.css-eqlu8i{font-size:small;padding-left:4px;}

Publication Activity (10 Years)

Top Topics

Top Venues

Bo Wan