Reflective Designs — An Overview

We render runtime system adaptations by design-level concepts such that running systems can be adapted and examined at a higher level of abstraction. The overall idea is to express design decisions as applications of design operators to be carried out at runtime. Design operators can implement design patterns for use at runtime. Applications of design operators are made explicit as design elements in the running system such that they can be traced, reconfigured, and made undone.Our approach enables Reflective Designs: on one side, design operators employ reflection to perform runtime adaptations; on the other side, design elements provide an additional reflection protocol to examine and configure performed adaptations. Our approach helps understanding the development and the maintenance of the class of software systems that cannot tolerate downtime or frequent shutdown-revise-startup cycles.We have accumulated a class library for programming with Reflective Designs in Squeak/Smalltalk. This library employs reflection and dynamic aspect-oriented programming. We have also implemented tool support for navigating in a system that is adapted continuously at runtime.Note: This extended abstract summarises our full paper [Hirschfeld, R. and R. Lämmel, Reflective Designs, IEE Proceedings Software (2004), Special Issue on Reusable Software Libraries. To appear. Available at http://homepages.cwi.nl/~ralf/rd/].     

Experimental simulation of friction and wear of carbon yarns during the weaving process

Nowadays many mechanical composite parts are reinforced by carbon weaving material. During the weaving process some damage to the carbon yarns appears that decreases the final mechanical properties of the part. This study focused on the friction interactions that occurred between warp yarns. A specific kinematic experiment has been done in order to simulate the weaving movement of these yarns, which induces friction. By varying experimental parameters, initial normal load, oscillation frequency and oscillation angle, it is possible to understand their influence on friction phenomena and fibre damage. The energies induced during friction have also been studied. The results obtained show that the coefficient of friction decreases with the increase of normal load, but is not influenced by the oscillation frequency. Yarn wear, i.e. filament breaks, appears beyond a certain normal load. The friction energy increases with normal load and oscillating angle but does not depend on oscillation frequency.     

Wire-woven cellular metals: The present and future

Wire-woven metals are a type of cellular metal composed of uniform 3D truss-like cells, and fabricated using wires as the raw material. Wire-woven metals are practically the most common choice for lattice truss metals to achieve multi-layered structures with fine cells. Since the new millennium, a number of wire-woven metals have been developed. This paper reviews various wire-woven metals and introduces their topologies and fabrication processes. In addition, their mechanical and thermal properties with analytic solutions, their variations, and applications are presented. Finally, the limits and prospects of wire-woven metals are discussed. The future of wire-woven metals seems promising due to the many options in the selection of the mother material, cell size, overall size, relative density, and cell geometry. Furthermore, their mechanical and thermo-hydraulic properties are superior to their competitors such as metal foams and they can be mass-produced at low cost.     

基于工作过程的现代织造技术教学实践与探析

将＂工学结合＂教学理念应用于现代织造技术的课程改革中,采用项目教学,以现代织造工作任务为驱动,培养学生的专业能力、语言表达能力及团队协作能力。经过教学实践验证,取得了一定的教学成果。     

FAST型剑杆织机生产Tencel亚麻交织物的体会

探讨用FAST型剑杆织机生产Tencel与亚麻交织物的工艺技术要求。整经要确保排列、张力、卷绕均匀,尤其是整经轴边纱排列密度易略小掌握;浆纱要确保毛羽被覆效果及各区张力和边纱排列;织造采用高后梁、早开口的上机工艺,并对织机关键部件进行改造和选用。成功开发并批量生产出Tencel与亚麻交织系列品种,解决了边撑疵、小断纬等疵点,织机平均效率达92%以上。     

三层方格布产品的开发

床上用品布料要求柔软舒适、吸湿透气,为适应这一要求,利用多臂织机开发了三层方格布.重点介绍了浆料配方、上浆工艺及织造过程中应该注意的问题,认为上浆工艺是重点,合理配置浆纱及织造工艺,才能提高织造效率.     

缥缈变化的“宋”罗

回顾了罗的变化历史及其组织结构和织造技术的演化,分析了南宋黄昇墓中出土的各种花罗组织结构多样性,重点探讨了二经绞平纹花罗、二经绞浮纬花罗、三经绞平纹花罗、三经绞斜纹花罗、三经绞隐纹花罗等在小花楼束综提花机上的装造形式、织造工艺和操作程序,为再现古代提花织罗技术的奇巧及保护和传承这项独特的丝织技艺提供技术支持。     

中国式住居的织补策略

文章从城市的视角来讨论中国式居住的问题,提出当前城市面临的最主要问题之一是城市片断的产生,而住区是这种片断的主要表现形式之一。针对城市“片断化”的现象,结合国内外相关领域的理论与实践,文章以“织补”为核心,提出“中国式住居”的发展策略。     

加减针凹凸花纹针织物设计与编织工艺

以加减针实现凹凸肌理效应为研究对象,让人们重新认识凹凸肌理效应的花纹组织,以传统的编织手法为基础,通过特殊的手段设计出新颖的花纹组织,并分析织物的编织工艺和结构花型意匠图,特别是对加减针凹凸肌理效应针织物的编织要点的总结,从中得到编织规律,人们能够通过编织规律随机的改变花纹形状。     

Estimating traffic capacity for weaving segments using neural networks technique

The impact of weaving vehicles on the capacity of freeway segments is uncertain due to the complexity in operation. The Highway Capacity Manual (HCM) 2000 provides values for capacity on various weaving segments (Exhibit 24-8) based on sets of conditions (configuration, speed, length, volume ratio, and number of lanes). However, to find capacity for a given set of conditions, an iterative process should be carried out using a properly programmed spreadsheet. This paper suggests alternative and convenient procedure for estimating capacity on weaving segments. Two capacity prediction models are developed using regression and neural networks (NNT). Although, linear regression (LR) technique showed satisfactory results, neural network technique outscored linear regression in the prediction performance, and generalization ability. The trained neural network architecture represented by weight and bias values for each layer is simply used to predict capacity for weaving segments under new conditions.