以C8051F020为核心的交流伺服控制系统

目前数字伺服驱动广泛采用单片机或数字信号处理器（DSP）来实现数字控制算法,控制算法复杂,而且基本上是单自由度控制器。交流伺服驱动器的控制包括信号的测量、滤波、核心算法的实时完成,驱动信号的产生和系统的监控、保护等功能。据此设计出了基于C8051F020单片机的多自由度伺服驱动控制器,使硬件和控制算法上都大为简化。     

量子磁盘表面磁场分布模拟

量子磁盘由于记录点尺寸很小,用常规的磁场测量方法无法对其表面磁场分布数值图进行测试。为了证实量子磁盘的可行性,该文对量子磁盘表面的磁场分布用有限元软件进行模拟计算,在假设量子磁盘的磁化方向为水平磁化的前提下,得到了圆形量子点直径为20nm;量子点间距离为10nm;方形量子点边长为20nm,间距为20nm的情况下量子磁盘的二维表面磁场分布图,证实了其表面磁场分布具有明显的周期性,周期长度为量子点大小加上量子点间距离。并且所得到的磁场分布图为量子磁盘的理论研究提供了一定的参考数据。     

Knowledge work and practices of seeing: Epistemologies of the eye,gaze, and professional vision

Much practice within organizations is to some extent embodied in and centered on the visual capacities of the agent, the acting subject. Distinguishing between ‘epistemologies of the eye’, i.e. theories of how knowledge is acquired through visual practices, and ‘practices of seeing’, i.e. theories and studies of how vision and visuality are actually used in everyday working life, the paper points to the need to understand vision and visuality in organizational practice. Using the case of functional magnetic resonance imaging (fMRI), it is suggested that professional vision, i.e. practices of seeing that are shared within epistemic communities, is firstly technologically mediated and, secondly, based on the ability to combine vision, speech, gesture, and other embodied and cognitive resources in order to make sense of the images produced by fMRI technology. The paper concludes that organization theory should examine practices of seeing in greater detail and as part of the project in order to understand how knowledge is constituted and used as a collectively constituted resource within organizations.     

开发区的创新驱动发展战略研究——以盐城经济技术开发区为例

实施创新驱动发展战略,对于开发区走出低水平投资驱动的传统增长路径,打造新的竞争优势具有战略意义。制度创新是推进创新驱动发展战略的突破口。为此,采取系列措施创新制度,落实发展战略：完善各类经济成分的组织机构和运行环境,推进各类企业的规范化制度建设,理顺公共资源和生产要素的配置制度,完善保障企业运作和市场公正运行的法制环境,改进开发区管委会的组织体系与工作方式等。     

Safety First: Recognizing and Managing the Risks to Child Participants in Magnetic Resonance Imaging Research

Specialized and up-to-date knowledge is required to identify and manage the risks associated with advanced biomedical research. Additional complexities need to be considered when the research involves infants or young children. In this article, we focus on recent information about the physical risks of pediatric magnetic resonance imaging research and highlight information gaps. With an eye to assisting institutional review boards and researchers, we consider strategies for the management of these risks and formulate key questions aimed at exposing hidden hazards. Institutional review boards should ask these questions, and researchers should bear them in mind as they develop research protocols.     

Disclosure of Unknown Harms in Magnetic Resonance Imaging Research

Unknown harms are by their nature difficult to communicate. While magnetic resonance imaging (MRI) has known risks (e.g., metal projectiles, dislodgement of medical implants), this imaging modality also has potential unknown long-term negative health effects associated with its static magnetic fields. We carried out a research ethics board (REB) file review of previously approved MRI research studies and found that unknown risks were either left undisclosed or were inadequately disclosed to research participants and REBs. This article outlines issues raised by our REB file review and suggests steps that should be taken in order to satisfactorily communicate information about potential unknown harms of MRI.     

高亮度车用灯驱动电路研究

以寿命长、抗震、高效、对光源良好的控制能力等优点,高亮度LED灯在汽车照明中得到广泛的应用,也是目前国际汽车灯具领域的研究热点,主要介绍车用高亮度LED驱动电路目前的研究情况及存在问题,并对其发展做了展望。     

宏达公司战略成本控制模式

针对宏达公司成本管理问题,采用规范研究的方法,分析了宏达船舶配套机械制造公司战略定位、成本动因、价值链以及业务流程,对其在设计成本、研发成本和制造成本方面提出战略成本模式的改进建议。希望宏达公司成本管理能从传统的成本控制模式转变到适应新环境的战略成本控制模式。     

Multivariate functional response low‐rank regression with an application to brain imaging data

We propose a multivariate functional response low‐rank regression model with possible high‐dimensional functional responses and scalar covariates. By expanding the slope functions on a set of sieve bases, we reconstruct the basis coefficients as a matrix. To estimate these coefficients, we propose an efficient procedure using nuclear norm regularization. We also derive error bounds for our estimates and evaluate our method using simulations. We further apply our method to the Human Connectome Project neuroimaging data to predict cortical surface motor task‐evoked functional magnetic resonance imaging signals using various clinical covariates to illustrate the usefulness of our results.     

作业成本法下成本动因的选择研究

实施作业成本法最重要也是最关键的步骤就是成本动因的选择,Babad等人开创了定量研究该问题的先河,后续研究以Homburg教授的模型最有代表性。但该模型只体现了成本动因之间的相关性,未考虑成本动因对企业整体的重要性。本文尝试性地对Homburg教授的模型加以改进,将重要性概念量化并融合到Homburg教授的模型中,实现了成本动因相关性和重要性的均衡。最后通过效果分析证实了改进模型确实兼顾到了成本动因的重要性和相关性。