A vision system for an automatic assembly machine of electroniccomponents

A vision system for the automatic assembly of electronic components is developed. The vision system presents information about positions, orientations, and quality of rectangular-shaped electronic components in real time. The orientation is detected by the windowed Hough transform along with a simple edge-detection method, whereas the position of each component is determined by using the projection method with dynamic thresholding. In addition, real-time implementation of the vision system in which multiple central processors are used for parallel processing of the algorithms is described     

高速公路汽车连环相撞事故预警系统的设计与实现

为了减少高速公路汽车连环相撞事故给人民生命财产带来的损失,本文提出一种基于无线传感器网络的车辆事故无线预警系统。本系统利用三维加速度传感器和陀螺仪实时监测车辆运行状况,检测事故的发生;一旦发生事故,则采用短距离无线通信与GPRS通信两套通信方案同时进行预警,一方面使事故发生地附近的车辆及时收到预警信号,提高警惕,采取措施,避免连环交通事故的发生;另一方面通知高速公路管理中心,及时处理事故,疏导交通。     

Design and implementation of an omnidirectional vision system for robot perception

To meet the demand of surrounding detection of a humanoid robot, we developed an omnidirectional vision system for robot perception (OVROP) with 5 Degrees of Freedom (DOFs). OVROP has a modular design and mainly consists of three parts: hardware, control architecture and visual processing part (omnidirectional vision and stereovision). As OVROP is equipped with universal hardware and software interfaces it can be applied to various types of robots. Our performance evaluation proves that OVROP can accurately detect and track an object with 360° field of view (FOV). Besides, undistorted omnidirectional perception of surroundings can be achieved through calibrations of both monocular and stereo cameras. Furthermore, our preliminary experimental results show that OVROP can perceive a desired object within 160 ms in most cases. As a result, OVROP can provide detailed information on surrounding environment for full-scope and real-time robot perception.     

一种语音导览系统的设计与实现

给出了一种可用于复杂自然环境下的景点语音自动导览系统。采用STM32F103RBT6作为MCU通过SPI模块与语音芯片ISD4004进行通信,来实现景点语音信息的随机录放;利用无源RFID实现景点的自动触发和识别。重点介绍了系统的主要功能设计和实现过程。     

水下航行体测试设备模糊FMECA分析与应用

测试设备是某水下航行体重要的地面保障设备之一,只有经调试检查合格的水下航行体才能够执行实航试验。为增强测试设备的系统可靠性水平,提高水下航行体的准备效率,在测试设备的设计阶段采用FMEA方法,对主要的故障模式、原因、影响和严酷度等进行了分析;同时采用层次分析方法和加权平均模型进行危害性综合评判,找出了潜在的设计缺陷和薄弱环节,并在设计中逐一得到了改进和优化。实际运行情况表明,测试设备的平均故障间隔时间(MTBF)大于800小时,虚警率小于2%,证明提出的模糊FMECA方法,在提高测试设备系统可靠性的工作中是切实可用的,能够为设计和改进提供有力的理论支撑。     

Adaptifon system for telephony ? an alternative implementation of the Lincompex concept

The compression and expansion circuits of the Lincompex system are each realised by using an adaptive delta modulator to perform an analogue-digital-analogue conversion. It is also shown that the Lincompex control signal giving information of the syllabic variations is readily available from the delta modulator.     

一种工业无线检测系统的设计与实现

无线检测系统的设计是为了将以太网技术无缝接入工业检测系统.现场检测设备以及网关等是该系统的主要组成部分,无线网关主要负责的是建立、管理网络,从各个节点中接收数据,将其解析之后再进行重组,以此来实现上位机组的软件通信.通过不断的测试,我们发现,该系统完美的符合了工业现场的所有需求,并且具有很高的实际价值.     

一种改进型OCSP系统的设计与实现

CRL与OCSP是证书状态查询的两种重要机制。本文比较了CRL和OCSP协议,在对OCSP协议进行分析的基础上,针对OCSP系统面临的主要问题,给出了一种改进型OCSP系统的设计与实现,并对实现中使用的关键技术进行了详细地论述。     

一种嵌入式指纹识别系统设计与实现

为了克服基于PC平台的指纹识别系统体积较大、可移动性不佳、不便于携带等不足,对嵌入式技术实现的指纹识别系统进行研究。对指纹识别算法进行分析,从硬件与软件两个方面着手,使用S3C2410微处理器与MBF200指纹采集传感器为硬件核心,拓展必要的外部设备,设计完成指纹识别系统。经过实际测试,该指纹识别系统具有实时性好、识别准确率高的优点,体积轻便、便于移动,为同类产品的设计研究提供参考依据。     

一种智能电力计量系统的设计和实现

文中提出了一种集成了GSM通信技术和图形用户界面的智能电力计量系统。该系统通过优化设计的智能电表实现了对低压用户的准确电力计量和潜在电力偷窃检测。所设计的智能电表采用了先进传感器和微控制器实现低压电能消耗的准确测量,并借助GSM网络将计量数据实时提供给供电公司并使用图形用户界面显示所检测的实时用电数据。测试结果表明,所设计的智能电力计量系统能够准确测量用电数据和有效检测潜在电力偷窃行为。     

融合式入侵防御系统的研究和实现

针对防火墙和入侵检测技术在网络安全防御上存在的缺陷，提出了一种融合式入侵防御系统。该系统通过增加入侵检测系统的联动响应插件，扩展防火墙动态加入过滤规则的功能，实现了两者的紧密结合。详细介绍了系统的结构、工作流程以及融合策略的具体实现，并给出了攻击实验。实验结果证明该防御系统对大规模的蠕虫攻击起到了实时抵制作用。     

Computational analysis of contractility in engineered heart tissue

Engineered heart tissue (EHT) is a potential therapy for heart failure and the basis of functional in vitro assays of novel cardiovascular treatments. Self-organizing EHT can be generated in fiber form, which makes the assessment of contractile function convenient with a force transducer. Contractile function is a key parameter of EHT performance. Analysis of EHT force data is often performed manually; however, this approach is time consuming, incomplete and subjective. Therefore, the purpose of this study was to develop a computer algorithm to efficiently and objectively analyze EHT force data. This algorithm incorporates data filtering, individual contraction detection and validation, inter/intracontractile analysis and intersample analysis. We found the algorithm to be accurate in contraction detection, validation and magnitude measurement as compared to human operators. The algorithm was efficient in processing hundreds of data acquisitions and was able to determine force-length curves, force-frequency relationships and compare various contractile parameters such as peak systolic force generation. We conclude that this computer algorithm is a key adjunct to the objective and efficient assessment of EHT contractile function.     

北斗预警信息压缩传输系统的设计与实现

北斗卫星单次短报文通信数据量及服务频率限制了长预警信息数据的传输。针对该问题,通过研究预警信息数据协议,设计预警信息压缩传输系统。为了提高预警信息传输效率,设计一种基于固定位长和RLE算法的混合压缩编码;为了提高预警信息传输成功率,设计基于预警信息压缩包的传输协议。此外,利用图形界面语言Qt完成人机交互界面并实现了预警信息压缩包的解码。最后,设计基于误报避免机制的预警信息显示,并给出算法的流程。实验结果表明,所设计的预警信息压缩传输系统能够有效地提高长预警信息数据传输效率和传输成功率,而且可在相关基于北斗卫星的预警信息发布系统中作为参考。     

Automated control synthesis for an assembly line using discrete event system control theory

The design of logic controllers for event-driven systems continue to rely largely on intuitive methods rather than on formal techniques. This approach results in a control code that requires extensive verification, is hard to maintain and modify, and may even fail at times. Supervisory control theory (SCT) provides a formal approach to logic control synthesis. In order to demonstrate the usefulness of the supervisory control theory in manufacturing systems, an educational test-bed that simulates an automated car assembly line has been built using LEGO/spl reg/ blocks. Finite state machines (FSMs) are used for modeling operations of the assembly line, and for the specifications that accomplish the task of successfully completing the assembly repeatedly. Using the technique of SCT, we derive a supervisor that enforces the specifications while offering the maximum flexibility of assembly. Subsequently a controller is extracted from the maximally permissive supervisor for the purpose of implementing the control by selecting, when possible, at most one controllable event from among the ones allowed by the supervisor. Testing to check the correctness of the control code is reduced, since the controller is guaranteed to enforce the specifications.     

电信反欺诈系统(AFS)的设计与实现

AFS系统(Anti-FraudSystem)通过运用数据挖掘技术中的贝叶斯分类器(BayesianClassifiers)来解决电信行业中的客户欺诈问题。首先介绍了开发电信反欺诈系统的必要性和紧迫性,论述了采用贝叶斯分类器的理由,然后介绍了AFS系统的构架和功能,并着重阐述了系统中采用贝叶斯分类器实现反欺诈功能的具体思路,最后对AFS系统进行了总体评价。     

一个基于Internet安全电子商务系统的安全机制设计与实现

本文介绍了我们已经实现的一个基于Internet的安全电子商务系统,它已成功地嵌入到当前流行的Netscape浏览器和服务器中,本文主要讨论了基于涉及基于设计级的安全需求,系统体系结构,系统功能和使用的关键技术,全安机制的设计和实现是我们的重点。     

Design and implementation of a robust and nonlinear flight control system for an unmanned helicopter

In this work, we focus on the design and implementation of a robust flight control system for an unmanned helicopter. A comprehensive nonlinear model for an unmanned helicopter system, which is built by our research team at the National University of Singapore, is first presented. A three-layer control architecture is then adopted to construct an automatic flight control system for the aircraft, which includes (1) an inner-loop controller designed using the H_∞ control technique to internally stabilize the aircraft and at the same time yield good robustness properties with respect to external disturbances, (2) a nonlinear outer-loop controller to effectively control the helicopter position and yaw angle in the overall flight envelope, and lastly, (3) a flight-scheduling layer for coordinating flight missions. Design specifications for military rotorcraft set for the US army aviation are utilized throughout the whole process to guarantee a top level performance. The result of actual flight tests shows our design is very successful. The unmanned helicopter system is capable of achieving the desired performance in accordance with the military standard under examination.