A new mixed-mode sustain method to improve the luminous efficiencyof alternating current plasma display panels

In this paper, a new mixed-mode sustain method to improve the luminous efficiency of alternating current plasma display panels is proposed. An opposite discharge is initiated between successive surface sustain discharges during the sustain period. The opposite discharge not only has a higher ultraviolet photon collection factor, but also improves the surface sustain discharge efficiency for the production of ultraviolet photons. The experimental results show that a 21~59% improvement in luminous efficiency within a sustain voltage range of 170 V to 190 V is achieved by the new mixed-mode sustain driving approach, as compared with the conventional surface-type sustain method     

How to write job descriptions effectively

This publication contains reprint articles for which IEEE does not hold copyright. You may purchase this article from the Ask*IEEE Document Delivery Service at http://www.ieee.org/services/askieee/     

自动动态补偿功能改善酸蚀蚀刻不均匀性问题

在酸蚀制程中,由于其蚀铜量较大,蚀刻线生产时蚀刻速度较慢,导致蚀刻不均匀性对线路制作存在很大影响,为改善蚀刻不均匀性的问题,采用奥宝公司专门开发的可制造性设计功能----自动动态补偿(Dynamic Etch Compensation),根据不同的间距设置不同的线宽补偿量,来确保蚀刻后线宽的一致性。     

撰写印制电路行业技术论文的几点想法

近几年来,在审校《印制电路信息》报刊和每年春秋季论文的评审过程中,学到了不少,受益匪浅,但也了解了在大量的投稿论文中,存在不少的瑕疵和不足。究竟如何写论文,既要有一定的技术含量,又要通顺流畅,能让业内外人士看得懂,这也并非易事。     

A new write/erase method to improve the read disturbcharacteristics based on the decay phenomena of stress leakage currentfor flash memories

This paper describes a new write/erase method for flash memory to improve the read disturb characteristics by means of drastically reducing the stress leakage current in the tunnel oxide. This new write/erase operation method is based on the newly discovered three decay characteristics of the stress leakage current. The features of the proposed write/erase method are as follows: 1) the polarity of the additional pulse after applying write/erase pulse is the same as that of the control gate voltage in the read operation; 2) the voltage of the additional pulse is higher than that of a control gate in a read operation, and lower than that of a control gate in a write operation; and 3) an additional pulse is applied to the control gate just after a completion of the write/erase operation. With the proposed write/erase method, the degradation of the read disturb life time after 10⁶ write/erase cycles can be drastically reduced by 50% in comparison with the conventional bipolarity write/erase method used for NAND type flash memory. Furthermore, the degradation can he drastically reduced by 90% in comparison with the conventional unipolarity write/erase method fur NOR-, AND-, and DINOR-type flash memory. This proposed write/erase operation method has superior potential for applications to 256 Mb flash memories and beyond     

Part II-how newcomers learn to write: resources for guidingnewcomers

For part I see ibid., June 1998. Part I focused on what newcomers need to learn in order to write appropriately on the job and suggested resources and strategies to help supervisors guide their new employees through the maze of organizational discourse conventions. This article, based on the same ethnographic study of newcomers in two organizations which provided the basis for Part I, will describe theories that explain how newcomers learn, show evidence of those theories in action, and provide further suggestions for facilitating learning about writing in the workplace     

Cognitive science applied to reduce network operation margins

In an increasingly competitive market environment with smaller product offer differentiation, a continuous maximization of efficiency, while guarantying the quality of the provided services, remains a main objective for any telecom operator. In this work, we address the reduction of the operational costs of the optical transport network as one of the possible fields of action to achieve this aim. We propose to apply cognitive science for reducing these costs, specifically by reducing operation margins. We base our work on the case-based reasoning technique by proposing several new schemes to reduce the operation margins established during the design and commissioning phases of the optical links power budgets. From the obtained results, we find that our cognitive proposal provides a feasible solution allowing significant savings on transmitted power that can reach a 49%. We show that there is a certain dependency on network conditions, achieving higher efficiency in low loaded networks where improvements can raise up to 53%.     

Eclipse开放式开发平台

嵌入式领域一直都在致力于为软件和系统工程师提供一个通用的开放式开发界面.工具则一向与实时系统(RTOS)或处理器紧密相关,而这二者的具体特性都需要专有环境来予以支持,这一点造成了开发人员在为了满足不断变化的设计需要而更换环境时,不可避免地会遭遇陡峭的学习曲线和额外的工具开销.     

Non-interacting write and read processes in organic memory devices

In organic memory devices, we introduce non-interacting “write” and “read” processes so that the state of a device is not perturbed during the “read” process. We have used heterojunction devices based on suitable materials in such a way that they can generate photovoltage and photocurrent upon illumination. Both open-circuit voltage or short-circuit current of the device have responded to conductance switching. We have showed that the device can be switched to a high-conducting state by applying a suitable voltage pulse and its state can be probed or “read” by measuring open-circuit voltage or short-circuit current. The results show newer parameters to probe organic memory devices.     

Dynamic adaptation policies to improve quality of service of real-time multimedia applications in IEEE 802.11e WLAN Networks

With the increased popularity of wireless broadband networks and the growing demand for multimedia applications, such as streaming video and teleconferencing, there is a need to support diverse multimedia services over the wireless medium. In order to efficiently address these diverse needs, efforts have been pursued to provide Quality of Service (QoS) mechanisms for medium access, resulting in a standard called IEEE 802.11e. One of the enhancements proposed in IEEE 802.11e is a polling-based access mechanism, which is targeted for real-time multimedia flows. In this polling-based scheme, scheduling and time allocation are based on flow reservations. Hence, the effectiveness of the mechanism is heavily dependent on the accuracy of the flow requirements in the reservation. Flow requirements, however, can vary over time and an allocation based on fixed reservations cannot address this variability. This limitation, which is present in the reference scheduler of IEEE 802.11e, leads to degraded multimedia quality for flows with variable requirements, even when channel resources are available. In order to address the above limitation, we present an adaptation framework that dynamically adjusts the polling-based access mechanism and associates flows to different modes of access (polling-based/contention-based), according to the current needs of the application, as opposed to solely relying on the reservation parameters. We demonstrate that with our adaptation, the achieved QoS for real-time multimedia streams, in terms of delay and throughput metrics, can be significantly improved compared to other known mechanisms. Additionally, we show the benefits of our adaptation framework on overall multimedia quality and system capacity. This research is supported by the University of California Discovery Grant (com02-10123) and the Center for Wireless Communications (CWC), University of California, San Diego.     

Preparing to write the document: a worksheet for situationalanalysis in the workplace

The author presents a worksheet which helps authors facilitate writing projects by identifying important preliminary considerations, the potential readers of the document, relationships of the writer to the audience and the document, the purpose of the document, and strategies to achieve that purpose. Each of these categories is discussed in detail, in terms of the entries to be made on the form     

一种多功能可擦写式LED点阵显示屏的研制

LED显示屏通常由计算机控制要显示的文字,但其硬件和使用成本都相对较高。设计并制作了一种多功能可擦写式LED点阵显示屏,系统采用STC11F16XE单片机作为主控芯片,用74LS245芯片与CD4515BC译码器组成显示驱动。实现了通过按键切换各种显示模式;利用光电传感器制作的光笔在LED点阵显示屏上可实现如点亮、划亮、反显、整屏擦除、笔画擦除、连写多字等显示功能,并且可以自动调节亮度和自动休眠。实验证明,利用该系统可以扩展成不同大小、内容可随时修改的LED显示屏,并且成本低,具有良好的推广价值。     

在服务中求发展 谱写协会新篇章

云南省无线电协会（简称“协会”）成立于2004年8月。近五年来,在云南省相关领导、部门和业务主管单位的关心、指导下,协会坚持按照《云南省无线电协会章程》办事,认真贯彻落实《国务院办公厅关于加快推进行业协会商会改革和发展的若干意见》（国办发[2007]36号）及《云南省人民政府办公厅关于培育和发展行业协会的指导意见》（云政办发[2006]51号）两个文件精神,     

Fade margins for soft and hard handoffs

A particularly attractive feature of CDMA wireless systems proposed in the Telecommunication Industry Association's standard IS-95 [1] is their ability to get into what is known as soft handoff. A mobile in soft handoff maintains simultaneous radio links with multiple base-stations which enables it to make use of the best quality leg most of the time. This is believed to result in a reduction of the fade margin that is needed to provide the desired coverage in a given geographical area in the presence of log-normal shadow fading. This paper presents an analysis of fade margins for systems allowing soft handoffs (e.g. CDMA) and those where only hard handoffs are possible (e.g. FDMA, TDMA). The analysis is based on a model for hard handoffs with hysteresis and connection delay and confirms the belief that soft handoffs result in smaller fade margins.     

Robust pole assignment and optimal stability margins

A robust pole assignment by linear state feedback is achieved in state-space representation by selecting a feedback which minimises the conditioning of the assigned eigenvalues of the closed-loop system. It is shown here that when this conditioning is minimised, a lower bound on the stability margin in the frequency domain is maximised.     

Adding noise to improve measurement

We have shown the possibility of improving the performance of several system classes in the presence of noise. The strategy depends on the application. Stochastic resonance can reduce threshold while suitable noise modulation can linearize thresholds