Integrated Personal Mobility Architecture: A Complete Personal Mobility Solution

The high expectations and demand for users to access the Internet from anywhere at anytime has made user mobility an important part of the design and development of the next generation mobile communications and computing. Traditionally user mobility has been divided into two areas: Terminal Mobility and Personal Mobility. In recent years terminal mobility has focused on the movement of the terminal and developed extensions to IP protocols such as Mobile IP. In contrast, personal mobility has only received limited attention, and is somewhat lagging behind. This research has either focussed on personal mobility in communications or personalisation of operating environments. As a result, to date no framework for providing true personal mobility has emerged. In this paper, we introduce a new personal mobility framework called IPMoA (Integrated Personal Mobility Architecture), which integrates both aspects of personal mobility to provide a complete personal mobility solution, and illustrate the viability of this approach through a proof-of-concept implementation.     

Design and fabrication of a significantly shortened multimode interference coupler for polarization splitter application

We report that we have successfully designed and fabricated a significantly shortened multimode interference coupler for application in polarization splitter, using a phenomenon that we termed "quasi-state" (QS) imaging effect. First, we identified and analyzed the QS imaging effect, and, based on the QS analysis, designed and fabricated a novel multimode interference (MMI) device with its split length shortened to 1/5 of a normally designed MMI split length. The fabrication is simple and cost effective and the fabricated device shows outstanding characteristics in extinction ratio, signal homogeneity, excess loss, and tolerance in the length of the splitter.     

A noncooperative power control game for multirate CDMA data networks

The authors consider a multirate code-division multiple acess system, in which all users have the same chip rate and vary their data rate by adjusting the processing gain. The receivers are assumed to be implemented using conventional matched filters, whose performance is sensitive to the received power levels. The authors' goal is to maximize the total system throughput by means of power control. A game theoretic approach is adopted. It is shown that for a certain type of pricing function, a unique Nash equilibrium solution exists and it possesses nice global properties. For example, it can be shown that for the optimal solution a high-rate connection should maintain a higher energy per bit than low-rate ones. The asymptotic spectral efficiency is also derived.     

基于浓厚分散系 HANAI 理论的血液温度生物 电阻抗特性量化表征研究

温度是人体的重要机能,血液温度变化监测对人体健康评估尤为重要。本文提出拓展的浓厚分散系HANAI理论,结合生物电阻抗谱,量化表征温度对血液生物电阻抗特性的影响规律,为监测血液温度及相关血液疾病的演变过程提供基础。试验结果表明,随着温度T不断上升,血液的生物电阻抗参数Z~*持续下降;奈奎斯特峰值电阻参数R_c和峰值电抗参数X_c与温度T有良好的线性关系,可描述为R_c=-0.3T+24.14和X_c=0.08T-5.78。将传统HANAI方程进行拓展,并进行多物理场数值模拟,其数值分析、模拟结果与试验结果较好吻合,揭示了血浆电导率σ_p和细胞质电导率σ_c是温度对血液生物电阻抗特性的主要影响因素。本文展示了一种潜在的血液温度监测方法,在临床医学领域或有一定的科研与应用价值。     

碳纳米管电极上的电化学行为分析

用化学方法对碳纳米管进行表面处理 ,用红外谱对处理后的碳纳米管进行表征 ,处理后的碳纳米管表面出现了活性功能团羧基。用这些碳纳米管制成电极 ,对Cd离子在硫酸钠中的电化学行为进行了分析。结果表明 ,从碳纳米管电极上可以观察到很好的、准可逆循环伏安图 ;在扫描速度为 10 0mV·s- 1时 ,氧化还原峰电位分别出现在 - 0 .6 5V和 - 0 .95V对照饱和甘汞电极(SCE)。峰电流与扫描速度的平方根成良好的线性关系 ,说明反应过程是由镉离子的扩散控制的。由循环伏安图相关的电位与扫描速度关系 ,我们导出了电子转移动力学速度参数。由于碳纳米管电极有很好的电化学活性和可重复性 ,它可以成为一种新型的分析电极材料     

分布式光纤拉曼放大器的增益平坦设计

介绍了在波分复用（WDM）系统中分布式光纤拉曼放大器（FRA）的理论分析模型。在此基础上，对增益平坦设计所需考虑的因素进行了分析；最后通过试验证明了它的有效性。     

MOCVD外延碲镉汞薄膜的生长工艺选择

金属有机化合物汽相沉积（ＭＯＣＶＤ）技术是制备用于红外焦平面阵列（ＩＲＦＦＰＡ）的高质量碲镉汞（ＨｇＣｄＴｅ）薄膜材料的重要手段。文中讨论了汞源温度、生长温度、衬底材料及互扩散多层工艺（ＩＭＰ）等因素在ＭＯＣＶＤ外延生长碲镉汞薄膜过程中的作用机理,并选择适合的生长条件获得了质量优良的碲镉汞薄膜。     

Precise Extraction of Charge Carrier Mobility for Organic Transistors

Unreliable mobility values, and particularly greatly overestimated values and severely distorted temperature dependences, have recently hampered the development of the organic transistor field. Given that organic field‐effect transistors (OFETs) have been routinely used to evaluate mobility, precise parameter extraction using the electrical properties of OFETs is thus of primary importance. This review examines the origins of the various mobilities that must be determined for OFET applications, the relevant extraction methods, and the data selection limitations, which help in avoiding conceptual errors during mobility extraction. For increased precision, the review also discusses device fabrication considerations, calibration of both the specific gate‐dielectric capacitance and the threshold voltage, the contact effects, and the bias and temperature dependences, which must actually be handled with great care but have mostly been overlooked to date. This review serves as a systematic overview of the OFET mobility extraction process to ensure high precision and will also aid in improving future research.     

信息安全中的数字水印技术

随着信息网络的日新月异,信息的合法使用和保护成为当前重要的热门话题.文中针对日益引起人们关注的数字水印技术,详细讨论了信息隐藏中数字水印技术的概念、基本特征、通用模型等.总结概括了这种技术的发展以及研究状况,在此基础上,提出进一步发展和研究的方向.     

数据网络的安全

本从安全的含义与安全威胁、安全服务与安全机制、安全体系、安全技术、管理法规等方面,对网络安全进行了阐述;并介绍了一些网络安全产品。