检索结果-南通市图书馆

A strong tracking nonlinear robust filter for eye tracking

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2010年第4期8卷 503-508页

作者： zutao zhang Jiashu zhang School of Mechanical Engineering Southwest Jiaotong University Chengdu Sichuan 610031 China Sichuan Key Lab of Signal and Information Processing Southwest Jiaotong University Chengdu Sichuan 610031 China

Non-intrusive methods for eye tracking are important for many applications of vision-based human computer ***,due to the high nonlinearity of eye motion,how to ensure the robustness of external interference and accuracy of eye tracking pose the primary obstacle to the integration of eye movements into today＇s *** this paper,we present a strong tracking unscented Kalman filter （ST-UKF） algorithm,aiming to overcome the difficulty in nonlinear eye *** the proposed ST-UKF,the Suboptimal fading factor of strong tracking filtering is introduced to improve robustness and accuracy of eye *** with the related Kalman filter for eye tracking,the proposed ST-UKF has potential advantages in robustness and tracking *** last experimental results show the validity of our method for eye tracking under realistic conditions.

关键词： Eye tracking Strong tracking unscented Kalman filter (ST-UKF) Unscented Kalman filter (UKF) Strong tracking filtering (STF)

A novel strong tracking finite-difference extended Kalman filter for nonlinear eye tracking

在线全文

学校读者我要写书评

暂无评论

Science in China(Series F) 2009年第4期52卷 688-694页

作者： zhang zutao zhang JiaShu School of Mechanical Engineering Southwest Jiaotong University Chengdu 610031 China Sichuan Key Lab of Signal and Information Processing Southwest Jiaotong University Chengdu 610031 China

Non-intrusive methods for eye tracking are important for many applications of vision-based human computer interaction. However, due to the high nonlinearity of eye motion, how to ensure the robust- ness of external interference and accuracy of eye tracking poses the primary obstacle to the integration of eye movements into today＇s interfaces. In this paper, we present a strong tracking finite-difference extended Kalman filter algorithm, aiming to overcome the difficulty in modeling nonlinear eye tracking. In filtering calculation, strong tracking factor is introduced to modify a priori covariance matrix and improve the accuracy of the filter. The filter uses finite-difference method to calculate partial derivatives of nonlinear functions for eye tracking. The latest experimental results show the validity of our method for eye tracking under realistic conditions.

关键词： strong tracking finite-difference extended Kalman filter (STFDEKF) eye tracking extended Kalman filter (EKF) suboptimal fadingfactor

Potential for energy conservation:A portable desktop paper reusing system for office waste paper

在线全文

学校读者我要写书评

暂无评论

能源与人工环境(英文) 2020年第2期1卷 165-177页

作者： Tingsheng zhang Xinglong Liu Yajia Pan zutao zhang Yanping Yuan School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031PR China

Renewable paper reusing plays a significant role in the sustainable environment under the background of the shortage in forest resources and the pollution from the paper *** conventional reusing stream of waste office paper appears to have low reusing rates while consuming massive amounts of energy in intermediate *** this study,we developed a novel portable renewable desktop paper reusing system based on font area detection and greyscale *** proposed system consists of two main parts,namely,a greyscale sensor and font area detection model and a polishing *** as an ink mark detector for waste desktop paper,the greyscale sensor and font area detection model can detect the font in the waste desktop paper using an adaptive dynamic compensation *** polishing mechanism will grind the font area of the wasted desktop paper,and this paper reusing processing is non-chemical,energy saving and environmentally *** proposed system is demonstrated through simulations and experimental results,which show that the proposed renewable desktop paper reusing system is portable and is effective for reusing waste office paper in the *** accuracy of 99.78%is demonstrated in the greyscale sensor and font area detection model,and the average reuse rate of one piece of paper is 2.52 times,verifying that the proposed portable system is effective and practical in renewable desktop paper reusing applications.

关键词： Paper reusing system Greyscale sensor Font area detection Save energy and resources

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

改善薄板翘曲的制作工艺

印制电路信息 2024年第6期32卷 58-59页

作者：张祖涛唐国斌肖祥燕何平胜宏科技(惠州)股份有限公司广东惠州516211

0引言随着电子产品朝轻、薄、小等方向发展,印制电路板(printed circuit board,PCB)也向薄型化方向发展。本文阐述了一种改善薄板翘曲的制作工艺,主要从优化叠构、改善生产流程上着手,以达到满足客户要求的板翘值。

关键词：印制电路板电子产品薄型化制作工艺翘曲生产流程薄板 PCB

A high-efficiency regenerative shock absorber considering twin ball screws transmissions for application in range-extended electric vehicles

在线全文

学校读者我要写书评

暂无评论

能源与人工环境(英文) 2020年第1期1卷 36-49页

作者： Zhanwen Wang Tianming zhang zutao zhang Yanping Yuan Yujie Liu School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031PR China School of Mechanics and Engineering Southwest Jiaotong UniversityChengdu 610031PR China

Renewable energy technologies,particularly in electric vehicles(EVs),have received significant attention in re-cent *** wasted energy in a vehicle’s shock absorber can be converted into an alternative energy source by regenerative shock *** this paper,a high-efficiency regenerative shock absorber considering twin ball screws transmissions is proposed for application in range-extended electric *** proposed regenerative shock absorber can convert vibrational kinetic energy,which is traditionally dissipated as heat in suspension systems,into *** proposed system is divided into four modules:suspension vibration input module,transmission module,generator module and power storage *** by road roughness,the irregular linear oscillations of the suspension are transmitted to the suspension vibration input *** reciprocating vibrations are converted into unidirectional rotation of the generator by a pair of ball screws,gears,and two overrun clutches in the transmission *** utilisation of different screw pitches leads to different damping coefficients for upward and downward progress,enabling the shock absorber to fully utilise elastic elements to im-prove vehicle comfort when compressed and quickly absorb vibrations when *** electricity produced by the generator is stored in supercapacitors to charge the battery and extend the range of *** mechanical properties of the full-scaled fabricated prototype were studied by utilising a mechanical testing and sensing *** average power output of 3.701 W in 1Hz-3 mm sinusoidal vibration input and a peak efficiency of 51.1%and average efficiency of 36.4%were achieved in a bench *** range can be approximately extended by 1 mile per 100 miles when EV is driving on the road of class B with a speed of 60 km/h,demonstrating that the proposed high-efficiency regenerative shock absorber is beneficial for harvesting renewable energy,and practical and significa

关键词： Regenerative shock absorber Ball screws with different characteristics Supercapacitors Range-extended electric vehicles Renewable energy

Elastic energy storage technology using spiral spring devices and its applications:A review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy and Built Environment 2023年第6期4卷 669-679页

作者： Shiwei Guo Li Yang Yanping Yuan zutao zhang Xiaoling Cao School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China

Harvesting and storing energy is a key problem in some *** energy storage technology has the advantages of wide-sources,simple structural principle,renewability,high effectiveness and *** paper elaborates the operational principles and technical properties and summarizes the appli-cability of elastic energy storage technology with spiral *** energy storage using spiral spring can realize the balance between energy supply and demand in some *** input-spontaneous out-put working style can provide simple energy sources for short-time energy supply,and provide strong moment impact and rapid start,or realize the energy conservation for reciprocating *** output working style can realize energy output with uniform speed for timekeeping and *** input working style can harvest and store random mechanical energy or convert small torque into a large moment to drive external ***,this paper proposes new researches and developments of elastic energy storage technology on new materials and structures,mechanical properties and structural dynamics analyses,design and control for new functions.

关键词： Mechanical energy storage Elastic energy storage Spiral spring system Energy input/output characteristics Implementation mechanism

A new real-time eye tracking based on nonlinear unscented Kalman filter for monitoring driver fatigue

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2010年第2期8卷 181-188页

作者： zutao zhang 1 , 2 , Jiashu zhang 2 (1.School of Mechanical Engineering, Southwest Jiaotong University, Chengdu Sichuan 610031, China 2.Sichuan Key Lab of Signal and Information Processing, Southwest Jiaotong University, Chengdu Sichuan 610031, China) School of Mechanical Engineering Southwest Jiaotong University Chengdu Sichuan China Sichuan Key Lab of Signal and Information Processing Southwest Jiaotong University Chengdu Sichuan China

A new scheme for driver fatigue detection is presented, which is based on the nonlinear unscented Kalman filter and eye tracking. Assuming a probability distribution than to approximate an arbitrary nonlinear function or transformation, eye nonlinear tracking can be achieved using an unscented transformation (UT), which adopts a set of deterministic sigma points to match the posterior probability density function of the eye movement. Driver fatigue can be detected using the percentage of eye closure (PERCLOS) framework in a realistic driving condition after the eye nonlinear tracking. This system was tested adequately in realistic driving environments with subjects of different genders, with/without glasses, in day/night driving, being commercial/noncommercial drivers, in continuous driving time, and under different road conditions. The last experimental results show that the proposed method not only improves the robustness for nonlinear eye tracking, but also can provide more accurate estimation than the traditional Kalman filter.

关键词： Eye tracking Unscented Kalman filter (UKF) Fatigue detection PERCLOS

在线全文

学校读者我要写书评

暂无评论

基于脆弱数字水印的人脸图像的安全性

西南交通大学学报 2007年第3期42卷 340-344页

作者：张祖涛张家树和红杰西南交通大学信号与信息处理四川省重点实验室

针对人脸识别系统中人脸图像数据可能受到攻击,导致人脸图像被恶意添加、替换、篡改等安全隐患,采用脆弱数字水印方法,解决上述人脸识别系统中人脸图像数据安全问题.用人脸原始图像的小波低频系数的高7位生成低频压缩图像,作为水印.通... 详细信息

针对人脸识别系统中人脸图像数据可能受到攻击,导致人脸图像被恶意添加、替换、篡改等安全隐患,采用脆弱数字水印方法,解决上述人脸识别系统中人脸图像数据安全问题.用人脸原始图像的小波低频系数的高7位生成低频压缩图像,作为水印.通过混沌置乱加密,将水印直接嵌入到原始人脸图像的最低有效位平面,区分人脸图像篡改并定位检测.实验结果表明,采用脆弱数字水印的人脸图像对恶意添加、替换、篡改都有很高的敏感度.嵌入脆弱数字水印对人脸图形的特征提取的识别率以及识别速度的影响都很小.

关键词：脆弱数字水印人脸识别特征提取图像安全性

在线全文

学校读者我要写书评

暂无评论

轨道交通领域新能源再生技术研究现状与展望

西南交通大学学报 2023年第5期58卷 1180-1193,1202页

作者：吴小平张祖涛潘亚嘉漆令飞张庭生郝大宁西南交通大学机械工程学院四川成都611756

近年来,铁路轨道沿线的智能监测设备建设、轨道交通领域的环境新能源再生等新兴技术受到了广泛关注.新能源再生技术的基本原理是通过捕获环境清洁能源并将获得的能量转化为电能,为各类智能传感器、交通信号装置、监控设备等正常运行提... 详细信息

近年来,铁路轨道沿线的智能监测设备建设、轨道交通领域的环境新能源再生等新兴技术受到了广泛关注.新能源再生技术的基本原理是通过捕获环境清洁能源并将获得的能量转化为电能,为各类智能传感器、交通信号装置、监控设备等正常运行提供电能.目前,轨道交通领域的各种新能源再生技术在国内外已有许多研究成果,包括风能采集、热能采集、太阳能采集、声能采集、制动能采集以及振动能采集.其中,振动能采集是轨道交通领域受关注程度最高、研究最为深入的一种新能源再生技术,其主要能量采集形式包括电磁式、压电式、摩擦式以及液压式.通过对研究内容及现状的总结和梳理,归纳了现有技术问题和工程应用挑战:包括稳定性、耐用性、经济性、能量大小、运动放大、可靠性方面.随着技术的逐渐成熟,新能源再生技术的实际工程应用将促进轨道交通领域的智能化和可持续化发展.

关键词：轨道交通新能源再生研究现状趋势与展望