高分辨高灵敏度CCD图像传感器驱动时序设计

在分析面阵CCD图像传感器结构和驱动时序基础上,针对高分辨率高灵敏度ICX694ALG大面阵CCD图像传感器,研究其驱动时序发生器;以现场可编程门阵列(FPGA)作为硬件平台,通过Verilog HDL硬件描述语言对该驱动时序发生器进行了硬件描述,采用ISE软件进行功能仿真,并针对XILINX公司的可编程逻辑器件XC3S1000进行了硬件适配;仿真测试表明,FPGA驱动时序发生器能够满足高分辨高灵敏ICX694ALG大面阵CCD图像传感器驱动要求,达到了设计要求。     

Personal driving diary: Automated recognition of driving events from first-person videos

In this paper, we introduce the concept of personal driving diary. A personal driving diary is a multimedia archive of a person’s daily driving experience, describing important driving events of the user with annotated videos. This paper presents an automated system that constructs such multimedia diary by analyzing videos obtained from a vehicle-mounted camera. The proposed system recognizes important interactions between the driving vehicle and the other actors in videos (e.g., accident, overtaking, etc.), and labels them together with its contextual knowledge on the vehicle (e.g., mean velocity) to construct an event log. A decision tree based activity recognizer is designed, detecting driving events of vehicles and pedestrians from the first-person view videos by analyzing their trajectories and spatio-temporal relationships. The constructed diary enables efficient searching and event-based browsing of video clips, which helps the users when retrieving videos of dangerous situations. Our experiment confirms that the proposed system reliably generates driving diaries by annotating the vehicle events learned from training examples.     

无轨胶轮车调度监控系统关键技术研究

详细介绍了无轨胶轮车调度监控系统井下分站行车区间闭锁机制、系统容量及布局方式、系统冗余性等关键技术的实现。工业试验结果表明,基于上述关键技术的无轨胶轮车调度监控系统单台分站之间的调度时间不超过3s,具有较高的可靠性。     

基于网络编码的文件备份方案

针对数据备份需占用大量空间和需额外手段对其安全保密性进行保护的问题,提出了一种基于网络编码技术的文件备份方案,其核心是对多个备份文件进行网络编码操作,生成编码备份文件后存储于备份服务器中。该方案包括以下部分:备份的基本原理、备份过程、文件更新对备份恢复的影响和处理、备份的更新和全局备份控制系统。实验与理论分析表明,该方案较传统备份方案大幅节省了存储空间,提高了备份文件的安全保密性,但文件的可恢复性微降并增加了系统的复杂度。     

Safety, domain independence and translation of complex value database queries

This paper considers the theory of database queries on the complex value data model with external functions. Motivated by concerns regarding query evaluation, we first identify recursive sets of formulas, called embedded allowed, which is a class with desirable properties of “reasonable” queries.We then show that all embedded allowed calculus (or fix-point) queries are domain independent and continuous. An algorithm for translating embedded allowed queries into equivalent algebraic expressions as a basis for evaluating safe queries in all calculus-based query classes has been developed.Finally we discuss the topic of “domain independent query programs”, compare the expressive power of the various complex value query languages and their embedded allowed versions, and discuss the relationship between safety, embedded allowed, and domain independence in the various calculus-based queries.     

Using space windowing for a preliminary analysis of complex time data in human component system studies. Examples with eye-tracking in advertising and car/head movements in driving

Empirical studies of human systems often involve recording multidimensional signals because the system components may require physical measurements (e.g., temperature, pressure, body movements and/or movements in the environment) and physiological measurements (e.g., electromyography or electrocardiography). Analysis of such data becomes complex if both the multifactor aspect and the multivariate aspect are retained. Three examples are used to illustrate the role of fuzzy space windowing and the large number of data analysis paths. The first example is a classic simulated data set found in the literature, which we use to compare several data analysis paths generated with principal component analysis and multiple correspondence analysis with crisp and fuzzy windowing. The second example involves eye-tracking data based on advertising, with a focus on the case of one category variable, but with the possibility of several space windowing models and time entities. The third example concerns car and head movement data from a driving vigilance study, with a focus on the case involving several quantitative variables. The notions of analysis path multiplicity and information are discussed both from a general perspective and in terms of our two real examples.     

管理信息系统通用模块的设计

对管理信息系统进行研究,给出通用模块的设计和实现。针对现存管理信息系统对需求变化响应不足的缺点,结合其共性提出通用模块的设计思路和实现方法,并通过定制进行业务的调整。通用模块分为6个业务子模块和1个控制子模块,在B/S和C/S架构下得以实现,并已经在实际中使用。     

高精度二相混合式步进电机控制系统研究

在二相混合式步进电机数学模型的基础上,针对电机低速运行时的振动和噪声过大的问题,研究了正弦脉宽调制细分驱动技术,开发出一种新型的基于单片机的多细分二相混合式步进电机驱动器。该系统主要分为数字控制部分、GAL片逻辑综合信号处理单元、SG3525恒流控制电路、驱动功放电路、过流保护及反馈电路和系统供电电源模块等。系统采用专用集成芯片和可编程逻辑器件,以8位单片机AT89C2051为控制核心,实现恒流控制、正/反转运行、过流保护和多档位细分等功能。实验结果表明,系统硬件和软件设计合理可行,各项技术指标均达到了设计要求。     

Anode‐voltage‐control circuit for compensation of luminance deterioration

Abstract— An external driving circuit that has realized long lifetime, power‐consumption control, and peak luminance for organic light‐emitting diode (OLED) displays have been developed. This circuit realizes an effective method for constant‐anode‐voltage (CV) driving refered to as clamped inverter (CI) driving. The feature of CV driving is to achieve low‐power consumption compared with constant‐anode‐current (CC) driving and to control the power consumption and peak luminance according to the image because display luminance can be easily changed by controlling the anode voltage. On the other hand, CV driving has the problem that luminance deterioration appears to be serious compared with that of CC driving because the current of the OLED element decreases according to usage time. To cope with this, a lifetime compensation circuit that has increased the anode voltage so that it compensates for the luminance deterioration has been developed. This circuit can compensate not only the decrease in current but also the decrease in luminance at a constant current that CC driving cannot. However, increasing the anode voltage causes an increase in stress on the OLED element. The influence of stress on OLED lifetime was verified. As a result, it was confirmed that this circuit can extend the lifetime by 32% even if the anode voltage is increased, causing stress on the OLED structure.     

系统通信模型执行性研究

针对可执行体系结构中系统数据交换是如何最终落实到具体的通信网络或设备,并进行具体数据传输问题,提出了系统通信模型执行方法.该方法描述了系统通信模型具有的基本元素及相关属性、模型元素之间的关系和表示,阐述了系统通信模型与系统接口描述模型、系统数据交换描述以及系统状态转移/系统时序图之间的关系,说明了系统功能驱动系统数据交换的具体步骤以及系统通信模型执行的过程.系统通信模型的执行使系统体系结构模型在整体上形成一个内在的一致性执行体,充实并完善了可执行体系结构,为可执行体系结构的执行奠定基础.