A borrow-and-return model to reduce client waiting time for broadcasting-based VOD services

One way to broadcast a popular video is to use multiple channels, each broadcasting a portion of the video periodically. Among the many schemes falling in this category, this paper focuses on several representative schemes (such as FB, Pagoda, and RFS ), which all share a FSFC property by repeatedly broadcasting the first segment of the video on the first channel. We propose a general borrow-and-return model that can be immediately applied to any scheme owning the FSFC property to reduce the viewer's waiting time without increasing the number of channels required. Given a group of videos, the basic idea is to lend the free time slots of videos without viewers to those videos with viewers to speedup the latter's transmission. By so doing, some bandwidth may be vacated by the borrowing videos to benefit others' transmission. The effectiveness of this model is analyzed by applying it to the FB scheme.     

Joint mobility tracking and handoff in cellular networks via sequential Monte Carlo filtering

We consider the application of sequential Monte Carlo (SMC) methodology to the problem of joint mobility tracking and handoff detection in cellular wireless communication networks. Both mobility tracking and handoff detection are based on the measurements of pilot signal strengths from certain base stations. The dynamics of the system under consideration are described by a nonlinear state-space model. Mobility tracking involves an online estimation of the location and velocity of the mobile, whereas handoff detection involves an online prediction of the pilot signal strength at some future time instants. The optimal solutions to both problems are prohibitively complex due to the nonlinear nature of the system. The SMC methods are therefore employed to track the probabilistic dynamics of the system and to make the corresponding estimates and predictions. Both hard handoff and soft handoff are considered and three novel locally optimal (LO) handoff schemes are developed based on different criteria. It is seen that under the SMC framework, optimal mobility tracking and handoff detection can be implemented naturally in a joint fashion, and significant improvement is achieved over existing methods, in terms of both the tracking accuracy and the trade-off between service quality and resource utilization during handoff.     

Optimal fractional movement-based scheme for PCS location management

In this letter, we propose a fractional movement-based location update scheme for personal communication service networks. Similar to the well-known fractional guard channel scheme for channel assignments, in our proposed scheme, the movement threshold is a real number with a fraction instead of an integer. We prove analytically that there is a unique optimal fractional movement threshold that minimizes the total cost of location updates and paging per call arrival.     

DETECTING TECHNIQUE OF WEAK PERIODIC PULSE SIGNAL VIA SYNTHESIS OF CROSS-CORRELATION AND CHAOTIC SYSTEM

In this letter, with the synthesis of usual cross-correlation detecting method and chaotic detecting method, a new detecting system for the weak periodic pulse signal is constituted,in which the two methods can play respective preponderance. Theoretical analyses and simulation studies have shown that the detecting system is very sensitive to the periodic pulse signal under strong noise background and has exceedingly powerful capability of suppressing complex noise.     

DISPERSION COMPENSATION CFBG IN100km 10Gbit／s RECIRCULATING SYSTEMS

A 10Gbit/s recirculating system is configured with Chirped Fiber Bragg Grating (CFBG) for the dispersion compensation. For the first time, the transmission distance in the loop reaches 1000km with bit error rate of 10-9. The effect of the group delay ripple of the fiber grating is also investigated in the recirculating systems, and it is shown that the transmission distance is limited to 4 cycles (4×167.1km ) in the loop with the power penalty fluctuation below 1.0dB. Thus the group delay ripple should be reduced to allow for the wavelength drift of±5GHz. At the end of this letter, the principles are given for designing long haul recirculating systems with dispersion compensation CFBG.     

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。     

微波治疗慢性增生性咽炎的疗效观察

采用微波热凝和雾化吸入两种方法对慢性增生性咽炎治疗的疗效观察比较。结果表明：微波治疗组总有效率为94.3%，雾化吸入组（对照组）总有效率为66.7%，微波治疗组疗效明显优于雾化吸入组，是目前治疗慢性增生性咽炎较为理想的方法。     

Nd:YAG激光治疗慢性肥厚性鼻炎对鼻腔黏液纤毛系统的影响研究

本文对Nd：YAG激光的三种不同方法治疗慢性肥厚性鼻炎治疗前、治疗后的鼻粘膜的临床表现及黏液毛系统的光镜、电镜进行了对照研究，对Nd:YAG激光治疗慢性鼻炎提供了理论依据。     

基于散乱数据点的三角网格生成算法研究

根据光学三维传感测得的数据特点，提出了一种基于动态圆的散乱数据点的三角网格生成算法。该算法效率高，得到的曲面的效果好，并且还可以根据实际情况调整动态圆的半径来改善图形的效果。本文还给出了用这种算法处理三维面形自动测量仪测量数据的实验结果。     

半导体激光穴位照射和电针灸治疗股外侧皮神经炎75例疗效比较

目的 :观察激光穴位照射治疗股外侧皮神经炎的疗效。方法 :将 75例患者随机分为 2组 ,治疗组 42例 ,采用激光穴位照射治疗。对照组 3 3例 ,采用常规针灸治疗。结果 :治疗组的痊愈率与对照组相比差别有显著意义 (P <0 .0 5 )。结论 :电针灸治疗股外侧皮神经炎有确切疗效 ,激光穴位照射治疗在此基础上更显著的提高疗效