Loose Coupling and Healthcare Organizations: Deployment Strategies for Groupware

Healthcare organizations are often organized in a modular, loosely coupled fashion where separate and semi-autonomous work units specialize in different areas of care delivery. This partitioning allows each unit to adapt to emerging practice standards in its area of expertise and to adjust to its local work environment. However, organizational loose coupling can limit the flow of information within organizations and can make it difficult to coordinate services when patients’ care is dependent on professionals from more than one unit. Groupware systems have the potential to improve coordination and information access in healthcare organizations. However, modularity and loose coupling make it difficult to introduce new systems when they span more than one unit, since authority is not always centralized and since perceptions and frames of reference on new deployments differ across units. In this paper, we define a groupware deployment framework for loosely coupled healthcare organizations that has two parts: a set of deployment challenges and a set of deployment strategies. The deployment challenges include: difficulties centralizing deployments, perceptions of inequity, role conflicts, and problems achieving critical mass. The deployment strategies outline a preliminary set of approaches for addressing the difficulties of deploying CSCW systems in loosely coupled healthcare organizations. We illustrate the framework by presenting a case study of a groupware deployment in a home care setting.     

多机紧耦合YH数控线切割系统通信与控制子系统的设计与实现

针对多机紧耦合YH数控线切割系统通信与控制子系统的设计与实现课题，讨论了在Windows环境下实现主CPU与从处理器控制板的通信与加工控制方法，对多机紧耦合系统中的通信代码设计、数控加工控制软件设计及其在YH数控线切割系统上的实现作了详细的叙述。     

一种基于CSMA/CA的无线局域网协议的实现方法

论述了一种基于CSMA／CA的无线局域网协议的实现方法，按照IEEE8802．11协议标准以及通过无线传输特性的分析，提出了一种利用时间片的方法来实现CSMA／CA协议的方案，详述了基于时间片CSMA／CA协议的无线局域网适配器YH－TLAN工作过程，并给出了具体的实现方法。     

一种带集成WATCHDOG电路的无纸记录仪的设计

为适应各种工业现场，必须进一步提高无纸记录仪的抗干扰能力。文章设计的无纸记录仪从硬件和软件上作了一些改进，采用了集成看门狗电路、V／F转换、光耦隔离技术、数字滤波等关键技术，使系统的稳定性与可靠性得到了较大提高。文章的研究成果已经得以在工业现场推广应用。     

Analysis and design of ribbon cables for high‐speed digital applications

Ribbon cables have been widely used as subsystem interconnections in a large number of digital systems, because they can convey numerous bits of a digital signal simultaneously. In this article, finite difference and finite difference time domain (FDTD) methods are used to analyze and optimize the electrostatic analysis design of ribbon cables, and measurements are used to verify the numerical results. © 2002 Wiley Periodicals, Inc. Int J RF and Microwave CAE 12: 148–158, 2002.     

多导体传输线互耦实验研究

对多导体传输线的参数进行了测量,分析了误差的原因,并对多导体传播输线的瞬态响应进行了实验研究,讨论了负载与传输线瞬态响应的关系。     

A New Apparatus for Combined Measurements of the Viscosity and Density of Fluids for Temperatures from 233 To 523 K at Pressures up to 30 Mpa

A new apparatus for measuring the viscosity and density of fluids is presented. The main element of the instrument is an electronically controlled magnetic suspension coupling. For the density measurement (buoyancy principle according to the single-sinker method), this coupling is used for the contactless transfer of the forces acting on a sinker in the measuring cell to an analytical balance. The coupling also serves as a frictionless bearing for a slender rotating cylindrical body which is slowed down due to the viscous drag of the fluid surrounding the cylinder. The viscosity of the fluid can be directly determined from the decay rate of the rotational frequency. The new combined viscometer-densimeter covers a viscosity range of 5 to 150 Pa·s and a density range from 20 to 2000 kg·m^–3 at temperatures from 233 to 523 K and pressures up to 30 MPa. Test measurements on the viscosities and densities of nitrogen and carbon dioxide at 253, 293, and 523 K at pressures up to 30 MPa show an estimated total uncertainty of ±0.6 to ±1.0% in viscosity and of ±0.02 to ±0.05% in density.     

色噪声下双头分子马达的停留时间

分子马达是一类能将化学能直接转变为机械能的蛋白质大分子，它们广泛存在于生物体中。它们沿相应微管作定向运动，其定向运动机制时高分子合成有重要的指导意义。我们引入分子马达双头之间的耦合作用势函数，建立分子马选在色噪声作用下的双头耦合模型。采用二阶龙格-库塔算法求解Langevin方程，结合Monte Carol模拟方法，计算得到马达的停留时间和跃迁时间。进一步分析讨论了耦合系数、阱深参数、噪声强度时停留时间及跃迁时间的影响，并作了相应的分析。     

Scattering Parameters Representing Imperfections in Precision Coaxial Air Lines

Scattering parameter expressions are developed for the principal mode of a coaxial air line. The model allows for skin-effect loss and dimensional variations in the inner and outer conductors. Small deviations from conductor circular cross sections are conformally mapped by the Bergman kernel technique. Numerical results are illustrated for a 7 mm air line. An error analysis reveals that the accuracy of the scattering parameters is limited primarily by the conductor radii measurement precision.     

Flexible Multibody Systems Models Using Composite Materials Components

The use of a multibody methodology to describe the large motion of complex systems that experience structural deformations enables to represent the complete system motion, the relative kinematics between the components involved, the deformation of the structural members and the inertia coupling between the large rigid body motion and the system elastodynamics. In this work, the flexible multibody dynamics formulations of complex models are extended to include elastic components made of composite materials, which may be laminated and anisotropic. The deformation of any structural member must be elastic and linear, when described in a coordinate frame fixed to one or more material points of its domain, regardless of the complexity of its geometry. To achieve the proposed flexible multibody formulation, a finite element model for each flexible body is used. For the beam composite material elements, the sections properties are found using an asymptotic procedure that involves a two-dimensional finite element analysis of their cross-section. The equations of motion of the flexible multibody system are solved using an augmented Lagrangian formulation and the accelerations and velocities are integrated in time using a multi-step multi-order integration algorithm based on the Gear method.