信息化时代服务补救对顾客抱怨的影响

信息化时代的来临为信息共享、自由交流创造了条件,个人的观点、意见以及思想可以通过网络平台便捷的表达。开放的社会环境加速了信息的传播,人们对服务补救的理解更加深刻,服务失误发生之后对补救的质量更为重视。服务补救的水平直接影响顾客抱怨的可能性,并对企业形象及综合竞争力产生影响。本文通过分析信息化时代顾客抱怨的特点,探讨信息化时代服务补救对顾客抱怨的影响,并提出化解顾客抱怨的对策。     

基于边界和模糊集理论的三维图像分割

本文提出了一种基于边界和模糊集理论的三维图象分割方法，利用高斯－拉普拉斯算子检测出图象中各结构的边界后，通过区域增长获取感光趣结构的三维二值模板，由高斯－拉普拉斯图象和二值模板出发，利用模糊集理论，确定感兴趣结构的三维模糊模板，从而达到在体积图象中分割出感兴趣结构的目的。     

宽带综合业务数字网的ATM技术

目前宽带综合业务数字网(B—ISDN)已成为各国研究与开发的重要内容。本文简述了信息传输技术的发展趋势,着重介绍了ATM技术的概念、ATM信元结构和传输帧结构、ATM交换技术和ATM系统参考模型。     

The electrode system in impedance-based ventilation measurement

In this paper, we determined which electrode types, sizes, and locations were best suited for impedance-based ventilation measurement. Optimal electrodes provide high signal-to-(motion) artifact ratio (SAR) and reliability by meeting the following criteria: 1) low baseline impedance, 2) high adhesion, 3) good physical stability, 4) large effective area, 5) thin with high flexibility. We compared 14 electrodes from two main groups: adhesive-gel and conductive rubber electrodes. Adhesive-gel electrodes are easy to apply, make good body contact, and do not slip during the course of an experiment. We found that higher SAR's are obtained when electrode area is increased by connecting several small electrodes together rather than by using a single electrode with a larger area. The peak SAR is achieved when two electrode arrays (area = 70 cm2) are centered at the 8th intercostal spaces on opposite midaxillary lines. To determine the optimal electrode locations, we placed 32 electrodes on the trunk and recorded impedance between 171 electrode combinations on ten normal adult subjects. Based on these data, we conclude that the SAR's are highest when one electrode is placed on the midpoint between the left and right second intercostal spaces on the sternum and the other electrode is placed in the opposite position on the back.     

Optimization of grating duty factor in gain-coupled DFB lasers withabsorptive grating-analysis and fabrication

Grating duty factor strongly affects the performance of gain-coupled (GC) distributed feedback (DFB) laser diodes with an absorptive grating. Through numerical analysis the authors have found an optimum value in the duty factor for their low threshold operation. The minimum threshold gain achievable at this optimum duty factor is found to be almost independent of the order of the grating. According to this prediction, the authors have fabricated GaAlAs/GaAs GC DFB lasers with a third-order absorptive grating where the grating duty factor has been made close to the theoretical optimum value. In 200-μm-long devices with both facets as-cleaved, low CW threshold current of 25 mA, external efficiency of 0.5 mW/mA, and SMSR as high as 45 dB have been obtained, which is qualitatively consistent with the analysis. High yield of single mode oscillation seems to be the result of the gain coupling     

High-temperature performance and microstructure of composite modified hard asphalt

Composite modified hard asphalt (CMHA) was prepared by four-step high-speed shearing method adding crumb rubber, styrene-butadiene-styrene (SBS) copolymer, and hard asphalt to QHD AH-70 neat asphalt. The high-temperature performance and microstructure of CMHA were evaluated by rotational viscometer, fluorescence microscopy, and infrared spectroscopy, through which the modification mechanism was proposed. The results show that the shearing time had great influence on the high-temperature performance of CMHA. A significant variation in phase morphology of CMHA during preparation was observed. It is found that phase morphology was converted from a continuous asphalt phase with dispersed polymer phase to two twisted continuous phases, then to a continuous asphalt phase with dispersed polymer phase again. Preparation of CMHA was a complex physical and chemical process. A fraction of SBS took part in the chemical reaction and others were dispersed in net structure, which is beneficial for workability and performance of asphalt.     

钛合金的激光气体氮化研究

本研究了Ｔｉ－６Ａｌ－４Ｖ合金的激光气体氮化，试验结果表明在激光功率密度大于５．０×１０＾４Ｗ／ｃｍ＾２，氮气压力为０．４ＭＰａ，通过激光辐射可在Ｔｉ－６Ａｌ－４Ｖ合金表面形成氮化钛。其氮化层的厚度为４００μｍ。在氮化层中存在大量氮化钛枝晶。其平均二次枝晶间距为１．７７μｍ。细小的氮化钛枝晶均匀地分布在氮化层中。最后测定和分析了氮化层的显微组织、相成份和显微硬度，并讨论了氮化钛的形成过程。     

Iterative boundary condition (IBC) in finite difference solvingscattering problems of open region

A novel truncation boundary condition, the iterative boundary condition (IBC), is proposed for finite difference (FD) solving electromagnetic scattering problems. The iterative process of this condition is given. Solutions of the IBC for some 2D cylinder scattering problems have been obtained and are compared with solutions using MoM and MEI. These solutions show very good agreement