上海贝尔阿尔卡特微波产品系列添新翼

上海贝尔阿尔卡特正式推出9500微波交叉连接设备（MXC）．以扩充及完善其全球领先的微波产品系列。     

上海贝尔阿尔卡特信息

上海贝尔阿尔卡特解决方案中标中国移动全国IP网络项目；上海贝尔阿尔卡特获河北联通、安徽移动网络扩容合同；上海贝尔阿尔卡特获中国移动和中国联通8800万欧元扩容合同；上海贝尔阿尔卡特助无锡电信网络转型。     

上海贝尔阿尔卡特信息

上海贝尔阿尔卡特被要求做强国资委规定的主业；上海贝尔阿尔卡特联合大唐移动成功中标网通青岛TD—SCDMA项目。     

上海贝尔阿尔卡特信息

上海贝尔阿尔卡特为克拉玛依部署下一代网络（NGN）， 黄菊参观上海贝尔阿尔卡特展台,     

上海贝尔阿尔卡特信息

上海贝尔阿尔卡特1430HLR获部颁入网证：日前，上海贝尔阿尔卡特宣布，其NGN解决方案的核心产品1430HLR（GSM数字移动通信归属位置寄存器）以其卓越的性能于近日获得信息产业部颁发的电信设备入网许可证（NAL）。这标志着上海贝尔阿尔卡特1430HLR产品方案已获取了接入电信网的钥匙．以开启其在国内的大规模商用之门。作为目前业界最先进的HLR产品．上海贝尔阿尔卡特1430HLR基于开放标准．可以向HSS平滑升级，支持网络向R5、R6的平滑演进.     

上海贝尔阿尔卡特信息

上海贝尔阿尔卡特为苏、鄂两省提供IP业务解决方案：上海贝尔阿尔卡特与中国移动签订3．4亿美元合同.     

上海贝尔阿尔卡特信息

广东电信选择上海贝尔阿尔卡特IP业务路由器;上海贝尔阿尔卡特更换总裁;上海贝尔阿尔卡特中标中国联通IP网络转型项目.     

上海贝尔阿尔卡特信息

中国网通选择上海贝尔阿尔卡特NGN解决方案；上海贝尔阿尔卡特获北京4号线3000万欧元大单；上海贝尔阿尔卡特A1000 SGSN获信息产业部电信设备入网许可证；上海贝尔阿尔卡特获得山西移动GPRS扩容合同。     

上海贝尔阿尔卡特信息

上海贝尔阿尔卡特全力以赴支援灾区:四川省汶川地震发生后,上海贝尔阿尔卡特情系灾区人民,全体员工立即行动起来积极向灾区捐款,截至2008年5月14日,上海贝尔阿尔卡特向四川汶川地震受灾地区捐款累计已达500     

江苏积极开展不明无线电信号查处工作

为进一步加强无线电管理工作,加大对违规设置使用台站的查处力度,江苏省无线电管理局积极加强对不明无线电信号的查处工作.日前,江苏无线电管理局又发出通知,要求全省无线电管理机构加强该项工作.     

取消阿尔卡特BTS合路器跨桥前后覆盖的测试分析

本文通过对合路器跨桥取消前后的对比测试结果分析,得出了取消跨桥后增加无线网络覆盖的结论,提出了一种增加网络覆盖的方法。     

买银行股与存银行的取舍问题探究--以各大银行网络数据调查为依据

有钱是应该存银行还是买银行股这是困扰众多民众的问题,存银行的怕收益太少,买股票又怕风险太高,因而到底该选择哪种,很多人难以选择。本文在对各大行的数据进行比较后选择工商银行的一支股票为例,对其进行基本面和技术面的分析,得出结论该支股票的可持有性较高,具有一定的未来价值。但归根到底,存银行还是买银行股还是要根据个人风险偏好,风险厌恶型投资者会选择存银行,而风险偏好者会选择买银行股。     

Confocal microwave imaging for breast cancer detection: localization of tumors in three dimensions

The physical basis for breast tumor detection with microwave imaging is the contrast in dielectric properties of normal and malignant breast tissues. Confocal microwave imaging involves illuminating the breast with an ultra-wideband pulse from a number of antenna locations, then synthetically focusing reflections from the breast. The detection of malignant tumors is achieved by the coherent addition of returns from these strongly scattering objects. In this paper, we demonstrate the feasibility of detecting and localizing small (<1 cm) tumors in three dimensions with numerical models of two system configurations involving synthetic cylindrical and planar antenna arrays. Image formation algorithms are developed to enhance tumor responses and reduce early- and late-time clutter. The early-time clutter consists of the incident pulse and reflections from the skin, while the late-time clutter is primarily due to the heterogeneity of breast tissue. Successful detection of 6-mm-diameter spherical tumors is achieved with both planar and cylindrical systems, and similar performance measures are obtained. The influences of the synthetic array size and position relative to the tumor are also explored.     

Implantable radiators for cancer therapy by microwave hyperthermia

The treatment of cancer by the combined effects of heat and radiation or chemotherapy is a promising procedure which has attracted wide interest. Microwave radiation is one of the most useful techniques for creating thermal fields in tissue but its use is limited by the rapid attenuation of microwaves in propagation through the body. Consequently, the design of microwave radiators which can be hypodermically inserted into tissue or introduced via a body orifice has been undertaken by a number of investigators. We review this work, the results of in vitro and in vivo animal tests, and the present status and outlook for patient treatment by this method.     

On the size of shares for secret sharing schemes

A secret sharing scheme permits a secret to be shared among participants in such a way that only qualified subsets of participants can recover the secret, but any nonqualified subset has absolutely no information on the secret. The set of all qualified subsets defines the access structure to the secret. Sharing schemes are useful in the management of cryptographic keys and in multiparty secure protocols.We analyze the relationships among the entropies of the sample spaces from which the shares and the secret are chosen. We show that there are access structures with four participants for which any secret sharing scheme must give to a participant a share at least 50% greater than the secret size. This is the first proof that there exist access structures for which the best achievable information rate (i.e., the ratio between the size of the secret and that of the largest share) is bounded away from 1. The bound is the best possible, as we construct a secret sharing scheme for the above access structures that meets the bound with equality.This work was partially supported by Algoritmi, Modelli di Calcolo e Sistemi Informativi of M.U.R.S.T. and by Progetto Finalizzato Sistemi Informatici e Calcolo Parallelo of C.N.R. under Grant Number 91.00939.PF69.     

机器人双耳声源定位

机器人拥有听声辩位能力是机器人智能化的重要表现。研究机器人声源定位具有广泛的应用前景。对于基于双耳听觉的声源定位,文中根据听觉系统中的"双耳效应"及"耳廓效应"等线索进行定位,首先建立了拟人机器人头部模型,通过头部转动实现前后方位的判定。其次,运用时间差(ITD)算法模型和声级差(ILD)算法模型分别实现了信号的水平方位的定位。并且应用互相关算法进行信号时延的估算。最后根据耳廓效应,根据频谱的变化实现了垂直方位的定位。本文通过定位算法编写程序,并且通过输入的声源信号实现声源方位的确定及误差分析。     

New frontiers for Detroit's big three

An overview is given of the electronics in the 1989 models from General Motors, Ford, and Chrysler. Leading the developments are head-up displays, speed-dependent suspension damping, an adaptive transaxle, a user-friendly CRT display, and fast defrosting. On- and offboard diagnostic systems to aid the mechanic have been introduced by Chrysler Motors