棱镜耦合自动测试系统设计

基于单片机与PC上位机,设计了包括硬件和软件的棱镜耦合自动测试系统。该系统控制了步进电机的运转状态,实现了光强数据的自动采集、处理,并通过软件完成数据存储、分析及图形显示。实验结果表明,该系统满足棱镜耦合技术要求,实验效果良好,实现了高精度、高自动测试的棱镜耦合技术。     

From sequential programs to concurrent threads

Chip multiprocessors are of increasing importance due to difficulties in achieving higher clock frequencies in uniprocessors, but their success depends on finding useful work for the processor cores. This paper addresses this challenge by presenting a simple compiler approach that extracts non-speculative thread-level parallelism from sequential codes. We present initial results from this technique targeting a validated dual-core processor model, achieving speedups ranging from 9-48% with an average of 25% for important benchmark loops over their single-threaded versions. We also identify important next steps found during our pursuit of higher degrees of automatic threading.     

Asymptotic model matching for nonlinear systems

This paper investigates the problem of designing a compensating control law for a square invertible nonlinear plant so that the response of the closed-loop system asymptotically matches that of a prescribed, driven, nonlinear model. A set of necessary conditions for achieving asymptotic model matching is established. One of these involves the stability properties for subdynamics which are common to every model matching closed loop. These subdynamics, called the “fixed dynamics,” are intrinsically characterized. Based on these results, a new set of sufficient conditions for achieving asymptotic model matching is given. The interrelation between the minimum-phase and vector relative degree properties of a plant and a matchable model are studied     

Understanding the impact of nurses' perception and technological capability on nurses' satisfaction with nursing information system usage: A holistic perspective of alignment

Based on the holistic perspective of ‘alignment’, evaluating the alignment of human–computer interaction is crucial to ensure effective information system implementation and a positive impact on performance. This study aims to examine the impact of alignment between the nurses' perception of NIS (Nursing Information System) performability and technological capability of NIS achieving success on nurses' satisfaction and nursing care performance through the perspectives of alignment as covariation and alignment as profile deviation. A quantitative method and a cross-section design were used to collect data from 531 registered nurses in Taiwan. The results indicate that the coalignment of nurses' perception of NIS performability and the technological capability of NIS achieving success has a positive impact on nurses' satisfaction with NIS usage. Consequently, nurses' satisfaction will increase with the improved performance of nursing care. The results of this research will help the management of NIS application and development within the context of nursing care.     

Time and cost risk analysis

The Project Management Group at UMIST has been involved with the development of project management software since the early 1970s, and has developed a construction project risk analysis program named CASPAR. Recently, the program has been further developed to include time-only probability analysis which reports the most frequently observed critical paths, the probability of achieving milestone dates, and the most likely completion data for the project. The original CASPAR program has also been extended to illustrate the effect of risks on both the cost and duration of a project. The results are presented in terms of ‘probability contours’ which quantify the probability of achieving values of both the cost and duration.     

一种单级链式逆变器软开关策略的研究

介绍了一种单级链式逆变器,该逆变器采用了移相全桥的控制方式.传统的移相全桥ZVS逆变器滞后桥臂很难实现ZVS,通过在传统的移相全桥电路中添加辅助谐振电路,从而使滞后桥臂实现ZVS.在ORCAD环境中进行了电路仿真,仿真结果证明,增加的辅助谐振电路能够有效地改善变压器漏感的续流能力,从而降低了开关损耗.     

Software development team flexibility antecedents

The ability to respond to changes in the environment during the development of software is crucial in achieving a quality product. Putting the project team together to achieve the ability to react effectively requires an understanding of the nature of flexibility and capabilities that might promote the ability to respond to changing requirements and conditions. Based on dynamic capability theory, we build a model of software quality that is dependent on the flexibility of the team, with the flexibility of the team dependent on reactive and anticipatory capabilities of the team members. A questionnaire administered to 119 software development team members indicates strong linkages from reactive capabilities and mixed results for anticipatory capabilities to team flexibility. Both flexibility components of a comprehensive response and efficient response to changes are critical in achieving quality software. The items comprising the capabilities can serve to guide management in building flexible development teams.     

A Mathematical Framework for Designing a Low-Loss, Low-Delay Internet

We survey some recent results on modeling, analysis and design of congestion control schemes for the Internet. Using tools from convex optimization and control theory, we show that congestion controllers can be viewed as distributed algorithms for achieving fair resource allocation among competing sources. We illustrate the use of simple mathematical models to analyze the behavior of currently deployed Internet congestion control protocols as well as to design new protocols for networks with large capacities, delays and general topology. These new protocols are designed to nearly eliminate loss and queueing delay in the Internet, yet achieving high utilization and any desired fairness.     

低密度纠删码度分布序列的若干分析性质

研究了删除信道中逼近容量的度分布序列。证明了低密度纠删码的度分布序列为逼近容量序列的充分必要条件，给出并证明了左边正刚度分布序列的若干分析性质，指出删除信道中逼近容量的度分布序列也应具有某些类似的分析性质。这些分析性质对低密度纠删码度分布序列的设计有着重要的理论指导意义。     

基于改进显著图的高效裂纹检测算法

裂纹检测对于确保设施和设备的安全运行非常重要。然而现有的裂纹检测方法数据标注困难,且训练时间长,检测速度慢。针对这些问题,提出一种基于改进显著图的裂纹检测算法,应用卷积神经网络提取的特征计算出图像中裂纹的位置,从而实现裂纹检测。该算法解决了裂纹检测算法数据标注困难的问题;训练时间短,使用两块k80显卡训练时间仅为23 min;检测速度快,具有105 帧/s的检测速度;同时在自制数据集上达到了52%的平均精度,验证了该算法的有效性。     

Compilers for improved Java performance

Because they are interpreted, Java executables run slower than their compiled counterparts. The native executable translation (NET) compiler's objective is to optimize the translation of Java byte-code to native machine code so that it runs nearly as fast as native code generated directly from a source. The article presents some preliminary results for several large application programs and standard benchmarks. It compares the NET-compiled code performance with Sun's Java VM, Microsoft's Java just-in-time compiler, and equivalent C and C++ programs directly compiled. The results show that the optimizing NET compiler is capable of achieving better performance than the two other byte-code execution methods, in some cases achieving speeds comparable to directly compiled native code     

A Survey of Documentation Practice within Corrective Maintenance

The purpose of documentation is to describe software systems and software processes. Consistent, correct and complete documentation of a software system is an important vehicle for the maintainer to gain its understanding, to ease its learning and/or relearning processes, and to make the system more maintainable. Poor system documentation, on the other hand, is the primary reason for quick software system quality degradation and ageing. Proper process documentation records the process, its stages and tasks, executing roles, their decisions and motivations, and the results of each individual process task. It is extremely important for achieving insight and visibility into the processes, important for their meaningful process measurement and thereby pivotal for achieving high process maturity. In this paper, we report on the results of an explorative study in which we have identified a number of rudimentary documentation requirements relevant within corrective maintenance, and found out how they were implemented within eighteen software organizations in Sweden. The goal was to examine the industrial documentation practice within corrective maintenance. Our results show that the documentation within corrective maintenance is still a very neglected issue within the organisations studied. None of our organisations has fully implemented all our documentation requirements.     

一种基于膨胀的渐进渐出图像融合算法

在对多幅图像的不同区域进行拼接时,需要涉及到图像分割、配准以及图像融合等方法。针对多幅图像不同区域进行拼接的情况,提出了一种“基于膨胀的渐进渐出”图像融合算法,该算法在图像融合过程中结合形态学方法,大幅度提高了拼接图像的效果。多个实验验证了所提算法的有效性。     

Parallel Image Reconstruction in Real-Time Ultrasound Process Tomography for Two-phased Flow Measurements

This paper investigates different parallel-processing architectures as a means of achieving real-time ultrasound tomographic imaging capability. The real-time numerical image reconstruction is implemented by a parallel processor network and DSP controlled data acquisition electronics. The parallel imaging technique developed for the present work has been shown to be capable of achieving the necessary real-time image generation rate (100 frames per second on a 100 × 100 image array for software image reconstruction) and an average update frequency of 30 frames per second when acquiring data from the hardware. The parallel image processing algorithm which combines geometric and algorithmic parallelism aiming at optimizing the parallel efficiency of the processors of the array has been implemented and verified. The experimental imaging results generated by the parallel imaging system are presented and the dynamic performance of the parallel system are discussed.     

SEPARATE: a machine learning method based on semi-global partitions

Presents a machine learning method for solving classification and approximation problems. This method uses the divide-and-conquer algorithm design technique (taken from machine learning models based on a tree), with the aim of achieving design ease and good results on the training examples and allows semi-global actions on its computational elements (a feature taken from neural networks), with the aim of attaining good generalization and good behavior in the presence of noise in training examples. Finally, some results obtained after solving several problems with a particular implementation of SEPARATE are presented together with their analysis.     

A unified approach to controller design for achieving ISS and related properties

A unified approach to the design of controllers achieving various specified input-to-state stability (ISS) like properties is presented. Both full state and measurement feedback cases are considered. Synthesis procedures based on dynamic programming are given using the recently developed results on controller synthesis to achieve uniform l/sup /spl infin// bound. Our results provide a link between the ISS literature and the nonlinear H/sup /spl infin// design literature.     

双目视差测距中的图像配准技术研究

双目视差测距是被动光电测距中的一种重要方法。主要就双目视差测距中的图像配准问题进行了探讨,找出了一种基于区域的快速匹配算法,同时比较了OpenCV中Block Matching块匹配法和Graph Cut图切割法,从而实现了基于Block Matching块匹配的双CCD测距系统,最后对实验结果进行了分析验证,结果证明该系统有效而实用。     

信道估计误差对功率分配算法的影响分析

自适应功率分配技术可以最大限度提高OFDM传输系统的信道容量和传输质量.是多用户OFDM系统中的关键技术.分析和比较了非理想信道估计情况下,信道估计误差对当前三种主要OFDM适应功率分配算法性能的影响.仿真结果表明,无论是理想信道估计还是存在误差的非理想信道估计条件下.理想频谱平衡算法和迭代频谱平衡算法的性能总是优于迭代注水算法.但是,随着信道估计误差的不断增大,迭代注水算法的性能具有较好的稳健性.对设计实际系统有重要的指导意义.     

The effect of competences on learning results an educational experience with a business simulator

Business games constitute a relevant e-learning method in management training. Their use and application has grown progressively, especially in business schools, universities and professional associations all over the world. The main reason for their popularity is that business games are seen as learning tools that allow students to acquire certain skills and competences above and beyond the skills fostered by other online or face-to-face methodologies. This study aims to analyse the relationship between generic competences and the learning results perceived by students in a business game. Analysis of the skills acquired using business simulators provides a wide field for potential future experimentation. The design of education plans is based entirely on the developing these skills. This study helps identify and assess which competencies are most linked to achieving the best learning outcomes, based on the value that students place on them, their satisfaction with them and their expectations of them. Only 16 of the 23 generic skills have a significant impact on achieving any of the objectives of the study variables.