Mobile Design as Neighborhood Acupuncture: Activating the Storytelling Networks of South Los Angeles

Abstract

A delicate touch is required to empower neighborhoods using civic media. Funding is persistently scarce. Especially in marginalized neighborhoods, blunt designs can be counterproductive and even entrench complex problems. New metaphors may be needed to guide design and empower local neighborhoods. Urban acupuncture is used as the basis for this study, emphasizing a light-touch strategy that has shown success in Brazil with urban transit, and more recently in Europe with urban design. We specifically propose “neighborhood acupuncture” to address the local level, tapping the sociology of place-based communication. To investigate the implications for systematic design, a case study is probed in South Los Angeles using mobile media for community mapping. Using qualitative methods, three tactics were investigated for the potential to “poke” the network into action, including one to bridge diverse storytelling networks. Each tactic ultimately seeks to build the capacity for collective action around neighborhood issues. Acupuncture is broadly argued to sustain two design shifts: first to help approach neighborhoods as ecosystems, and second, to design for circulation rather than any single technology platform.     

价值流技术在产品生产系统优化中的应用

以学生课桌椅的生产过程为研究对象,运用价值流图技术对其进行研究。首先,通过对改善前产品生产过程进行工艺流程分析和现场数据测量,绘制出产品生产的价值流图,并找出其中存在的问题;然后,针对存在的问题,运用工业工程的相关方法,提出相应的改善措施,并绘制出改善后产品的价值流图。通过改善工位设备、车间布局和人员的调整,有效地减少了生产过程中非增值活动,并减少了在制品库存,缩短了交货周期,提高了加工效率。     

复合校正算法在硬币图像校正中的应用

针对移动硬币图像获取过程中产生的图像失真问题,提出了一种可以获得清晰标准图像的复合校正算法。该算法将透视映射校正与椭圆变换理论相结合,对抓拍到的非静止状态下的失真硬币图像进行还原校正,为获得清晰标准的硬币表面花纹图案提供了一种高效的图像形变矫正手段,降低了硬币图像捕捉环节对机械结构精密度的依赖。实验表明,该算法图像校正精度更高,其图像平均灰度值仅为椭圆直接变换法的10%。     

施工扬尘防治中的政府角色及政策偏好研究

基于我国建筑业的阶段性发展特征,结合国外扬尘防治的政策实践,阐述我国施工扬尘防治工作中的政府角色;分析38个城市的政策与法规数据,归纳施工扬尘防治政策的5个措施维度。建议引入多维度集成的一体化控尘政策方案,进一步细化、明确、设计现有政策内容,以提升我国施工扬尘的防治效果。     

电缆测井高速遥传系统中比特分配与星座映射的实现

通过在现有的硬件平台提高电缆的传输速率,优化系统硬件平台内部资源分配。采用"注水"算法进行信道比特及能量联合分配。该方法与子信道能量均匀分配方式相比,链路层传输速率提高9.13%。设计了一种OFDM系统中星座映射的新方法,与原有方法相比,新方法大大节约了硬件存储资源。     

一体化标识网络映射缓存DoS攻击防范方法研究

为了抵御一体化标识网络中接入路由器可能遭受的映射缓存DoS攻击,本文提出了一种基于双门限机制的映射缓存DoS攻击防范方法.该方法设计了一种基于迭代思想的谜题机制降低映射缓存中映射信息条目的增加速率,并采用了映射信息可信度算法识别和过滤映射缓存中恶意的映射信息条目.仿真实验与性能分析表明,该方法能够有效地抵御映射缓存DoS攻击,防止映射缓存溢出.     

Value stream mapping approach and analytical network process to identify and prioritize production system’s Mudas (case study: natural fibre clothing manufacturing company)

The current research has been done to identify and prioritize the Mudas of the production line of a natural fibre clothing manufacturing company; in this way, value stream mapping has been used to identify the Mudas, then analytical hierarchy method has been used to screen the Mudas. In the first step, necessary information to design value stream of production process has been obtained by observation, measurement and interview; afterward, according to the obtained information and by forming a focus group, Mudas in the production line have been identified and prioritized according to seven categories of Mudas. In order to prioritizing the Mudas by the usage of analytical hierarchy method, the Super Decision software has been applied. Then, according to the obtained priorities, suggested map of the future value system has been drawn and some suggestions have been presented to eliminate Mudas and move towards the lean manufacturing.     

限制失真的网格参数化方法

针对当前网格参数化效率较低、映射失真较严重的问题，提出一种限制失真的网格参数化方法。首先，预处理原始网格模型。输入原3D网格模型，采用Half-Edge数据结构来重新组织网格并切割网格模型产生相应的切缝；构建Tutte映射把3D网格映射到一个2D凸多边形域，即构建2D网格模型。然后，进行限制失真的网格参数化计算。将Tutte映射后的2D网格模型作为限制失真计算的初始数据，建立相对于原3D模型网格的失真度量函数；求得该度量函数的最小值点，即为映射后的网格坐标集合；将映射后的网格作为限制失真映射的输入网格，设定迭代终止条件，循环迭代直至迭代结束，得到收敛的最优网格坐标；在计算映射失真度时，针对等距映射失真采用Dirichlet能量函数度量，针对共形映射失真采用尽可能等距（MIPS）能量函数度量；在求解映射失真度量函数的最小值点时采用代理函数法结合组合牛顿法的最优解方法。最终，实现了该方法并开发了一个原型系统。在原型系统中，分别设计了限制等距失真和限制共形失真的网格参数化实验，对程序执行时间和失真能量下降情况进行了统计和对比，提供了相应的纹理映射效果展示。实验数据表明，所提出的方法执行效率高、映射失真能量下降快，最优值收敛质量稳定；纹理映射时纹理着色均匀、布局紧致、线条均匀，符合实际应用的标准。     

面向数据流结构的指令映射优化方法

在高性能计算领域,数据流是一类重要的计算结构,也在很多实际场景表现出很好的性能和适用性。在数据流计算模式中,程序是以数据流图来表示的,数据流计算中一个关键的问题是如何将数据流图映射到多个执行单元上。通过分析现有数据流结构的指令映射方法及其不足,提出了基于数据流结构的新型指令映射优化方法。主要是根据多地址共享数据包的特性对指令映射方法进行优化,延迟多地址共享数据路由包的拆分,减少网络拥堵。     

Strain gradient differential quadrature finite element for moderately thick micro-plates

In this study, we integrate the advantages of differential quadrature method (DQM) and finite element method (FEM) to construct a C¹-type four-node quadrilateral element with 48 degrees of freedom (DOF) for strain gradient Mindlin micro-plates. This element is free of shape functions and shear locking. The C¹-continuity requirements of deflection and rotation functions are accomplished by a fourth-order differential quadrature (DQ)-based geometric mapping scheme, which facilitates the conversion of the displacement parameters at Gauss-Lobatto quadrature (GLQ) points into those at element nodes. The appropriate application of DQ rule to non-rectangular domains is proceeded by the natural-to-Cartesian geometric mapping technique. Using GLQ and DQ rules, we discretize the total potential energy functional of a generic micro-plate element into a function of nodal displacement parameters. Then, we adopt the principle of minimum potential energy to determine element stiffness matrix, mass matrix, and load vector. The efficacy of the present element is validated through several examples associated with the static bending and free vibration problems of rectangular, annular sectorial, and elliptical micro-plates. Finally, the developed element is applied to study the behavior of freely vibrating moderately thick micro-plates with irregular shapes. It is shown that our element has better convergence and adaptability than that of Bogner-Fox-Schmit (BFS) one, and strain gradient effects can cause a significant increase in vibration frequencies and a certain change in vibration mode shapes.