Putting it into perspective

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Putting the pleasure into products

Now that consumers expect everything they buy to be both functional and easy to use, designers need to think seriously about the pleasure their products bring to users. The artefacts and products with which we surround ourselves are potential sources of pleasure. They should be designed with a view to how they can provide pleasure to those who use and experience them. This requires a rich understanding of users, an approach to design that sees products not just as tools but as `living objects'. Moving beyond usability, to take a holistic pleasure-based approach, can facilitate the creation of useful usable and pleasurable products that will delight the customer. The four pleasures discussed are physiological pleasure, social pleasure, psychological pleasure, and ideological pleasure     

供货短缺己经出现

在过去的几个月里,电子元件短缺的情况继续扩大。几乎所有的产品都受到了影响。为什么会出现这种情况？何时形势将会好转？我们需要了解什么是驱动供货短缺的动力,以及供货商们正在做什么样的反应。但有一点是肯定的,在这些产品短缺的周期中,供货短缺的情况被多次展示和多重产品订货所放大了。     

Putting success into your succession planning

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10Gb以太网物理层接口展望

随着10G市场的成熟,以太网设备间物理层连接方案也有了多种选择 随着多家供应商可以提供具有卸载(offload)能力和高密度、低延迟交换能力的网络接口适配器,10Gb以太网产业链正在迅速成熟.     

济南市扎实推进全运会安全保障工作

济南市无线电管理办公室在济南市委、市政府以及山东省无线电管理办公室的领导下．以全运会无线电安全保障工作为重点,通过加强组织领导、搞好应急演练．开展执法检查、落实工作任务等措施,扎实有效地开展了全运会的安全保障工作．并取得了阶段性的工作成果。     

把战术数据链纳入C~3I的互通环境

在分析战术数据链特点的基础上，提出了一种简单易行的方案来实现数据共享。这种方案也可作为向数据链和C3I系统内其他网络实现完全互连互通过渡的中介手段。     

Putting the human being back into engineering [education]

The author suggests that the main crisis facing engineering education and the engineering industry is a crisis of professionalism. He outlines four principles of professionalism, discusses the goal of education, and examines excellence in industry     

Incorporating two-port networks with S-parameters into FDTD

A modeling approach for incorporating a two-port network with S-parameters in the finite-difference time-domain (FDTD) method is reported. The proposed method utilizes the time-domain Y-parameters to describe the network characteristics, and incorporates the Y-parameters into the FDTD algorithm. The generalized pencil-of-function technique is applied to improve the memory efficiency of this algorithm by generating a complex exponential series for the Y-parameters and using recursive convolution in the FDTD updating equations. A modeling example is given, which shows that this approach is effective and accurate. This modeling technique can be extended for incorporating any number of N-port networks in the FDTD modeling     

把跳频嵌入导弹武器C^3I系统分组无线网

文章针对导弹武器C3I系统的特点，对把跳频技术嵌入该通信网后需要考虑的关键问题进行了分析和探讨，以供进一步设计和实现时参考。     

Incorporating mutation probability into priority-aware protection in optical networks

A persisting major challenge for optical network operators is to meet the various availability requirements of the different subscribed services through the deployment of effective protection strategies. Priority-aware shared protection is a promising scheme that has been proposed in the open literature as a potential approach to tackling this challenge. However, the priority-aware protection strategy is rigid in the sense that it privileges the high priority connections regardless of the low priority ones. Hence, this letter proposes to improve priority-aware protection by introducing the mutation probability parameter. This parameter expresses the likelihood that a highpriority connection be relegated temporarily to a lower priority level during recovery. In this way, the mutation-based protection strategy offers optical operators the possibility to increase the availability of their low-priority clients without violating the availability requirements of their high-priority ones. Performance of this novel protection strategy is analyzed in this letter by precisely calculating the connection availabilities resulting from its deployment.     

Functional models of UMTS and integration into future networks

The universal mobile telecommunication system (UMTS) will implement terminal mobility and a form of personal mobility limited to UMTS. The most essential procedures to provide this are related to user registration, location management, handover and security. These mobility procedures are specified using specific functional models. In these models, the required functions are identified and the distribution of the functions in the network is anticipated. In a next step, the specific models are mapped onto a generic functional model. This generic model can be considered as the integration and unification of the specific models. Its structure reflects two important implementation aspects. First, the integration of UMTS into future networks for fixed telecommunications is anticipated. Secondly, the application of the intelligent network architecture for the implementation of the UMTS mobility procedures and service provision is assumed     

Introducing microcells into macrocellular networks: a case study

The performance in terms of signal-to-interference ratio (SIR), teletraffic, and spectral efficiency of a combined macrocellular and microcellular network is investigated when either both types of cells share the same channel set, or when the channel set is partitioned between the macrocells and the microcells. The analysis is for time-division multiple access (TDMA) with frequency hopping, power control, and discontinuous transmission, and the radio channel is composed of an inverse fourth-power path loss law with log-normal fading. We commence by introducing a single microcell into a hexagonal cluster of macrocells before considering clustered microcells. Both omnidirectional and sectorized cells are examined. We find that high reuse factors are required when channel sharing is employed. When channel partitioning is used, no co-channel interference occurs between the microcells and the macrocells allowing them to be planned independently. The reuse factors in the microcells and macrocells therefore do not need to be increased beyond conventional values. The outcome is that by opting for channel partitioning, the improvement in spectral efficiency compared to channel sharing is two to three times greater     

Putting our heads together

It is also overdue for us to consider combining the European MOVPE and MBE workshops. Maybe as an annual event. Epitaxy has become a continuum with MOVPE and MBE at the extremes and in-between theMOMBE, CBE and other strange bedfellows like ALE and MEE. For the sake of sharing knowledge and not re-inventing the wheel maybe weshould consider one overall European epitaxy conference.     

Putting data on a diet

The use of data compression to reduce bandwidth and reduce storage requirements is discussed. The merits of lossless versus lossy compression techniques, the latter offering far greater compression ratios, are considered. The limits of lossless compression are discussed, and a simple method for lossless compression, runlength encoding, is described, as are the more sophisticated Huffman codes, arithmetic coding, and the trie-based codes invented by A. Lempel and J. Ziv (1977, 1978), WAN applications as well as throughput and latency are briefly considered