Building a Platform to Bridge Low End Mobile Phones and Cloud Computing Services

Two waves of technology are dramatically changing daily life: cloud computing and mobile phones. New cloud computing services such as webmail and content rich data search have emerged. However, in order to use these services, a mobile phone must be able to run new applications and handle high network bandwidth. Worldwide, about 3.45 billion mobile phones are low end phones;they have low bandwidth and cannot run new applications. Because of this technology gap, most mobile users are unable to experience cloud computing services with their thumbs. In this paper, a novel platform, Thumb-in-Cloud, is proposed to bridge this gap.Thumb-in-Cloud consists of two subsystems: Thumb-Machine and Thumb-Gateways. Thumb-Machine is a virtual machine built into a low end phone to enable it to run new applications. Thumb-Gateways can tailor cloud computing services by reformatting and compressing the service to fit the phone' s profile.     

中国三网融合中的博弈及其影响

In January 2010, the State Council of China decided to speed up the convergence of the telecommunications network, cable network and Internet network. That means the government led practical exploration of the networks convergence. The convergence is related to the entities in the fields of telecommunications, broadcasting and the Internet industry. The authors apply the static game theory to analyze the games among the players in the fields of telecommunications and broadcasting, and point out that the games would strengthen the network infrastructures, promote the development of related industries, and profoundly influence and change the ways of thinking and social management in China. At last, the paper puts forward some policy recommendations.     

SOINMOSFET的双峰及辐射效应研究

通过对SOINMOFET的总剂量辐照试验,对器件辐照中的双峰效应进行研究。文中给出了双峰效应的表征。试验结果表明双峰的形状随辐照总剂量的增加而改变,并分析了具体的原因。另外,背栅晶体管对主要晶体管的耦合效应要远远大于其对寄生晶体管的作用。     

Method of Passive MMW Image Detection and Identification for Close Target

This paper mainly deals with the problem of detecting and identifying target in close range, the performance of which will be effected by the radiometer’s parameters and target’s characteristics. According to the relationship between the range equation of the Passive Millimeter Wave (PMMW) and these parameters, we present a convenient statistical method based on PMMW image detection to solve the inherent problem by statistical radiometer parameters, which can be achieved by the W band radiometer experimental data. Finally, we validate the method by simulation and experiment. The results show that the method is convenient for detecting and identifying target in close range.     

ZnO压敏防雷芯片工频耐受与通流能力的相关性

为了研究ZnO压敏防雷芯片的工频过电压耐受特性和8/20μs通流能力的相关性,在生产线上抽取同批次产品进行工频过电压耐受试验和8/20μs通流能力试验。研究结果表明:工频过电压老化后会使压敏电阻的通流能力下降,但经过8/20μs雷电流峰值20 kA冲击后,压敏电阻的工频过电压耐受能力会增强,在冲击15次左右时达到最大值,随着冲击次数的增多,工频过电压耐受能力会降低。     

Closed-form frequency estimator based on narrow-band approximation under noisy environment

A new method for single sinusoidal frequency estimation in closed-form formula is proposed. Since sinusoidal signals are narrow-banded and white noise distribution is statistically equal in the whole spectrum, a narrow-band signal extracted from the Fourier transform of the original signal can be used to approximate the noise-corrupted sinusoidal signal. A concise closed-form formula is then deduced to estimate the frequency based on the narrow-band signal. Performance analysis and simulation results are presented, showing that the new algorithm has close performance to the Cramer-Rao bound, especially under low SNRs. It is also demonstrated that the method can be easily generalized to multi-sinusoidal signals.     

One pot iridium-catalyzed asymmetrical double allylations of sodium sulfide: a fast and economic way to construct chiral C2-symmetric bis(1-substituted-allyl)sulfane

One pot asymmetrical double allylations of sodium sulfide catalyzed by an iridium complex along with a combination of caesium fluoride and water in dichloromethane have been realized and the double allylation products with two C-S bond chiral centers were obtained in 67-99% yields with b/l 81/19-99/1, dr 85/15-99/1, and 96-99% ee.     

Ag cluster-aptamer hybrid: specifically marking the nucleus of live cells

Silver cluster-aptamer hybrids were mineralized via an artificially designed aptamer. The hybrids gave red emission when excited by light, and they successfully targeted the nucleus of live cells. This method is an effective approach to make cell target probes.     

Facile fabrication of robust multilayer films: visible light-triggered chemical cross-linking by the catalysis of a ruthenium(II) complex

Highly stable covalently attached multilayer films were constructed by visible-light irradiation of hydrogen-bonding directed multilayer films of poly(allylamine) and poly(4-vinylphenol).     

One-pot reduction of graphene oxide at subzero temperatures

We report a new reducing agent system: hydriodic acid with trifluoroacetic acid, which can chemically convert graphene oxide into reduced graphene oxide at temperatures below 0 °C in solution. This is the first achievement to produce reduced graphene oxide at subzero temperature with a mass production.