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Reading comprehension based on visualization of eye tracking and EEG data

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Science China(Information Sciences) 2020年第11期63卷 276-289页

作者： shiwei cheng Yilin HU Jing FAN Qianjing WEI School of Computer Science and Technology Zhejiang University of Technology

Using eye tracking technology can help us understand reading behavior. Furthermore, sharing the teacher’s eye tracking features resulted in improving the students’ comprehension of the same reading material [1]. On ... 详细信息

关键词： N/A null no key words eye tracking EEG

Adaptive navigation assistance based on eye movement features in virtual reality

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Virtual Reality & Intelligent Hardware 2023年第3期5卷 232-248页

作者： Song ZHAO shiwei cheng School of Computer Science and Technology Zhejiang University of TechnologyHangzhou 310023China

Background Navigation assistance is essential for users when roaming virtual reality scenes;however,the traditional navigation method requires users to manually request a map for viewing,which leads to low immersion and poor user *** To address this issue,we first collected data on who required navigation assistance in a virtual reality environment,including various eye movement features,such as gaze fixation,pupil size,and gaze ***,we used the boosting-based XGBoost algorithm to train a prediction model and finally used it to predict whether users require navigation assistance in a roaming *** After evaluating the performance of the model,the accuracy,precision,recall,and F1-score of our model reached approximately 95%.In addition,by applying the model to a virtual reality scene,an adaptive navigation assistance system based on the real-time eye movement data of the user was *** Compared with traditional navigation assistance methods,our new adaptive navigation assistance method could enable the user to be more immersive and effective while roaming in a virtual reality(VR)environment.

关键词： Eye movement Navigation Human-computer interaction Virtual reality Eye tracking

Mesh Smoothing Method Based on Local Wave Analysis

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Chinese Journal of Mechanical Engineering 2012年第3期25卷 598-607页

作者： QIN Xujia ZHENG Hongbo cheng shiwei LIU Shishuang XU Xiaogang School of Computer Science and Technology Zhejiang University of TechnologyHangzhou 310023China Department of Equipment system and Automatization Dalian Naval AcademyDalian 116018China State Key Laboratory of CAD&CG Zhejiang UniversityHangzhou 310058China

As the mesh models usually contain noise data,it is necessary to eliminate the noises and smooth the *** existed methods always lose geometric features during the smoothing ***,the noise is considered as a kind of random signal with high frequency,and then the mesh model smoothing is operated with signal processing *** wave analysis is used to deal with geometric signal,and then a novel mesh smoothing method based on the local wave is *** proposed method includes following steps：Firstly,analyze the principle of local wave decomposition for 1D signal,and expand it to 2D signal and 3D spherical surface signal processing;Secondly,map the mesh to the spherical surface with parameterization,resample the spherical mesh and decompose the spherical signals by local wave analysis;Thirdly,propose the coordinate smoothing and radical radius smoothing methods,the former filters the mesh points＇ coordinates by local wave,and the latter filters the radical radius from their geometric center to mesh points by local wave;Finally,remove the high-frequency component of spherical signal,and obtain the smooth mesh model with inversely mapping from the spherical *** mesh models with Gaussian noise are processed by local wave based method and other compared *** results show that local wave based method can obtain better smoothing performance,and reserve more original geometric features at the same time.

关键词： mesh models local wave analysis noise smoothing

EasyGaze:Hybrid eye tracking approach for handheld mobile devices

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Virtual Reality & Intelligent Hardware 2022年第2期4卷 173-188页

作者： shiwei cheng Qiufeng PING Jialing WANG Yijian CHEN School of Computer Science and Technology Zhejiang University of TechnologyHangzhou 310023China

Background Eye-tracking technology for mobile devices has made significant ***,owing to limited computing capacity and the complexity of context,the conventional image feature-based technology cannot extract features accurately,thus affecting the *** This study proposes a novel approach by combining appearance-and feature-based eye-tracking *** and eye region detections were conducted to obtain features that were used as inputs to the appearance model to detect the feature *** feature points were used to generate feature vectors,such as corner center-pupil center,by which the gaze fixation coordinates were *** To obtain feature vectors with the best performance,we compared different vectors under different image resolution and illumination conditions,and the results indicated that the average gaze fixation accuracy was achieved at a visual angle of 1.93°when the image resolution was 96×48 pixels,with light sources illuminating from the front of the *** Compared with the current methods,our method improved the accuracy of gaze fixation and it was more usable.

关键词： Eye movement Gaze estimation Fixation Human-computer interaction Eye tracking

准噶尔盆地重点领域油气勘探研究进展及潜力方向

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油气地质与采收率 2024年第4期31卷 24-41页

作者：王金铎张关龙庄新明宫亚军张翊曲彦胜薛雁程世伟中国石化胜利油田分公司勘探开发研究院山东东营257015

准噶尔盆地胜利探区主要位于盆地周缘超剥带、复杂山前带和深洼区,油气成藏条件复杂,勘探难度大。为明确胜利探区重点领域的潜力方向,指导下步油气勘探部署层次优选,基于胜利探区准西缘超剥带领域、准中地区上组合深层领域、准中地区下... 详细信息

准噶尔盆地胜利探区主要位于盆地周缘超剥带、复杂山前带和深洼区,油气成藏条件复杂,勘探难度大。为明确胜利探区重点领域的潜力方向,指导下步油气勘探部署层次优选,基于胜利探区准西缘超剥带领域、准中地区上组合深层领域、准中地区下组合超深层领域、准北缘及准东南山前带领域沉积、储层、油源对比、输导体系、成藏模式、油气富集控制因素等勘探研究进展系统总结,对各重点领域下步的潜力方向进行了分析。结果表明:准西缘超剥带领域的哈山地区侏罗系—白垩系、车排子地区新近系沙湾组、车排子地区石炭系及准中地区上组合深层领域的永进-征沙村地区侏罗系齐古组、莫西庄地区侏罗系三工河组及东道海子凹陷成6井区侏罗系八道湾组是下步主要的增储上产阵地;准中地区下组合超深层领域的沙湾凹陷征10井区二叠系上乌尔禾组—三叠系克拉玛依组、盆1井西凹陷庄深1井区二叠系风城组—夏子街组是下步重要的接替阵地;准北缘哈山山前带及准东南博格达山南、北山前带准原地系统是下步需要持续探索的有利阵地;石北凹陷及石钱滩凹陷石炭系深层非常规页岩气领域是今后需要积极准备的后备阵地。“十四五”—“十五五”期间,胜利探区应以“立足全区、决胜深层、常非并重、统筹推进”勘探思路为指导,持续、有序地推进盆地各重点领域的勘探。

关键词：勘探历程含油气系统重点领域勘探研究进展潜力方向准噶尔盆地

芽孢杆菌B55产羧甲基纤维素酶的培养优化研究

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工业微生物 2024年第1期54卷 76-80页

作者：张佳雯王玉芳张忠民卢宽鲁仪增程仕伟鲁东大学生命科学学院烟台市生物发酵与分离工程实验室山东烟台264025 烟台职业学院山东烟台264670 山东省林草种质资源中心山东济南250102

芽孢杆菌来源的纤维素酶具有耐热耐碱等优良催化特性,故而受到了广泛关注。本研究利用筛选的芽孢杆菌B55发酵生产羧甲基纤维素酶,在确定碳源、氮源、金属盐、羧甲基纤维素添加量、接种量等对菌株产酶影响的基础上,进行正交试验优化以确... 详细信息

芽孢杆菌来源的纤维素酶具有耐热耐碱等优良催化特性,故而受到了广泛关注。本研究利用筛选的芽孢杆菌B55发酵生产羧甲基纤维素酶,在确定碳源、氮源、金属盐、羧甲基纤维素添加量、接种量等对菌株产酶影响的基础上,进行正交试验优化以确定最佳发酵培养工艺。研究结果表明:最佳培养工艺的配方为30 g/L甘油、5 g/L葡萄糖、3 g/L大豆蛋白胨、16 g/L酵母浸粉、4 g/L羧甲基纤维素、3 g/L磷酸氢二钾,3 g/L磷酸二氢钠,pH 7.0,在4%(V/V)接种量、培养温度32℃的条件下,发酵48 h获得最大酶活力401.34 U/mL,具备规模生产的应用潜力。

关键词：羧甲基纤维素酶芽孢杆菌培养优化发酵生产

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试油井老资料复查及实例分析

油气井测试 2005年第1期14卷 36-37页

作者：陈世伟辽河石油勘探局井下作业公司辽宁盘锦124107

辽河盆地油气藏类型复杂,储集层类型丰富,给老井老资料挖潜工作带来难度。随着勘探开发技术的提高,对原有试油层进行重新再认识,以增加石油地质储量,具有重要经济意义。

关键词：试油油井老井油气藏类型挖潜油层石油地质增加经济意义勘探开发

Collaborative eye tracking based code review through real-time shared gaze visualization

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Frontiers of Computer Science 2022年第3期16卷 163-173页

作者： shiwei cheng Jialing WANG Xiaoquan SHEN Yijian CHEN Anind DEY School of Computer Science and Technology Zhejiang University of TechnologyHangzhou 310023China Information School University of WashingtonSeattle 98195-9440USA

Code review is intended to find bugs in early development phases,improving code quality for later integration and ***,due to the lack of experience with algorithm design,or software development,individual novice programmers face challenges while reviewing *** this paper,we utilize collaborative eye tracking to record the gaze data from multiple reviewers,and share the gaze visualization among them during the code review *** visualizations,such as borders highlighting current reviewed code lines,transition lines connecting related reviewed code lines,reveal the visual attention about program functions that can facilitate understanding and bug *** can help novice reviewers to make sense to confirm the potential bugs or avoid repeated reviewing of code,and potentially even help to improve reviewing *** built a prototype system,and conducted a user study with paired *** results showed that the shared real-time visualization allowed the reviewers to find bugs more efficiently.

关键词： computer supported collaborative learning computer supported cooperative work social computing fixation human computer interaction

Non-Darcy flow in oil accumulation (oil displacing water) and relative permeability and oil saturation characteristics of low-permeability sandstones

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Petroleum Science 2010年第1期7卷 20-30页

作者： Zeng Jianhui cheng shiwei Kong Xu Guo Kai Wang Hongyu State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China School of Natural Resources and Information Technology China University of Petroleum Beijing 102249 China CNPC Greatwall Drilling Company Beijing 100101 China

Hydrocarbon resources in low-permeability sandstones are very abundant and are extensively distributed. Low-permeability reservoirs show several unique characteristics, including lack of a definite trap boundary or caprock, limited buoyancy effect, complex oil-gas-water distribution, without obvious oil-gas-water interfaces, and relatively low oil （gas） saturation. Based on the simulation experiments of oil accumulation in low-permeability sandstone （oil displacing water）, we study the migration and accumulation characteristics of non-Darcy oil flow, and discuss the values and influencing factors of relative permeability which is a key parameter characterizing oil migration and accumulation in low-permeability sandstone. The results indicate that： 1） Oil migration （oil displacing water） in low- permeability sandstone shows non-Darcy percolation characteristics, and there is a threshold pressure gradient during oil migration and accumulation, which has a good negative correlation with permeability and apparent fluidity; 2） With decrease of permeability and apparent fluidity and increase of fluid viscosity, the percolation curve is closer to the pressure gradient axis and the threshold pressure gradient increases. When the apparent fluidity is more than 1.0, the percolation curve shows modified Darcy flow characteristics, while when the apparent fluidity up＂ non-Darcy percolation curve; 3） Oil-water is less than 1.0, the percolation curve is a ＂concave- two-phase relative permeability is affected by core permeability, fluid viscosity, apparent fluidity, and injection drive force; 4） The oil saturation of low- permeability sandstone reservoirs is mostly within 35%-60%, and the oil saturation also has a good positive correlation with the permeability and apparent fluidity.

关键词： Non-Darcy flow relative permeability oil saturation low-permeability sandstone