Notes数据库中存取控制的自维护

Lotus Notes开发平台是一个面向非结构化信息领域优秀的通信处理软件和群件平台。本文将Notes数据库中存取控制安全机制和传统的关系数据库相结合,根据人员工作的调整自动改变人员在Notes系统中的相应权限,实现Notes存取控制安全机制的自维护     

设计文件的审批与会签

设计文件的审批与会签国营７６０厂标准化室（４５３０５９）杨超培无论是《军工产品质量管理条例》的贯彻，还是ＧＢ／Ｔ１９０００－ＩＳＯ９０００《质量管理和质量保证》系列标准的贯彻，都把设计控制作为质量体系要素的重要一环。搞好设计文件的审批会签是落实技术责...     

基于Lotus Domino/Notes的并发访问控制

在分布式系统设计开发过程中，保证信息的一致性和多用户访问的并发控制是一个重要内容。为了解决Lotus Domino／Notes自身的复制和保存冲突不能完全满足实际并发访问控制的需要，在分析排它锁并发控制模型的基础上，设计了基于Lotus Domino／Notes的文档编辑并发控制模型，并描述其具体实现过程。实际应用表明，模型能够满足多用户并发访问控制的要求。     

机柜生产的工艺性评价

从工艺人员的角度分析了通用机械设计中应注意的加工和装配问题，供设计人员在设计图纸时，及工艺人员进行会签时参考，以帮助提高图纸设计质量。     

基于Intranet架构的办公自动化系统技术研究

介绍了OAS设计中的关键技术——网络技术、非结构化数据库技术和工作流技术。并以企业的OAS为实例，着重论述了基于工作流图的分析设计方法、基于Lotus Domino Notes流程控制模板的工作流实现技术。     

基于LotusNotes的文档ID应用剖析

介绍了文档数据库Lotus Domino／Notes的特点．对其文档处理的核心，即Notes文档的ID构成机制作了系统剖析．并在此基础上分析了如何在文档复制中运用ID的不同组件以及如何运用API程序访问文档ID等。     

基于Lotus Domino/Notes办公自动化系统的开发

以某大学为例，从办公自动化系统功能设计，数据库设计，系统设计和安全性设计出发，介绍了基于Lotus Domino／Notes办公自动化系统软件的开发。     

Lotus Domino/Notes在超高压局公文管理中的应用

系统采用目前极为流行的群件系统——LDtus Domino／Notes，完成了哈尔滨超高压局在公文流转过程中的各种计划表、申请表、规程、报表、发文、收文的网上起草、审批、下发等，使得各种公文的管理、流转实现了办公自动化，实现了东北公司对办公自动化系统的整体规划。从总体设计、具体实现、技术问题、安全机制、系统特点等方面对系统进行了介绍与探讨。     

工作流技术在信息通信资源申请中的应用研究

针对电力行业信息通信资源申请的特殊业务,结合各部门会签审批的行业特点,自主开发了一个简单易用的工作流引擎,本文对该工作流引擎进行了简单介绍。同时本文提出一种基于角色的会签工作流模型及两种会签策略。本文将工作流模型定义为一个五元组,然后介绍了顺序会签和并行会签两种会签策略,以及判断会签节点状态的方法。最后通过实例对会签策略进行了验证。     

Lotus Notes Release 4——高档的群组软件

如果你的公司承担的是在大型网络上传播信息的任务,你可能已经在使用Lotus的Notes,而且对其牢骚满腹。Notes的界面令人生畏,开发环境也已过时,而且在安装设置Notes时需要许多技术人员支持。那为什么还要用它呢?这是因为,尽管Notes有这些缺陷,但目前还没有哪个软件具备了Notes的功能:把分布式数据库与功能强大的通信、复制和防火墙(为远程协同工作而特殊设计的功能)结合在一起。     

基于GA-MP的低复杂度OTFS检测算法

针对正交时频空(Orthogonal Time Frequency Space, OTFS)通信系统信号检测复杂度高的问题,提出一种改进的高斯近似消息传递(Gaussian Approximate Message Passing, GA-MP)检测算法。依据最大后验概率检测准则,对发送信号及隐变量进行逐符号高斯近似,基于置信传播算法与联合因子图进行消息传递,用边缘后验概率替代GA-MP中的外部信息以减少运算量,结合阻尼因子提升收敛速度,同时引入概率阈值减少后续更新的节点数,从而使运算复杂度得到有效降低。实验结果表明,改进后的GA-MP算法在保证误码率性能的前提下具有更低的复杂度。     

大内径离轴光纤旋转连接器的设计与实现

为了实现旋转系统之间的光信号耦合,设计了一 种新型的大内径离轴光纤旋转连接器。 将光纤准直器 和红外直角棱镜按照一定的规则排布在法兰盘上,使光信号能在较大离轴偏移量下保持持续 传输状态。分 析了影响离轴光信号传输耦合效率的主要因素,通过优化热扩芯光纤(TECF)准直器和红外直 角棱镜进一步减小了 离轴光纤旋转连接器的耦合损耗。研制的离轴光纤旋转连接器法兰盘内径为60mm, 内外法兰盘上的TECF准直器分别为16个, 并行光收发器实现串行光信号的收发。实验结果表明,本文的离轴光纤旋转 连接器在60RPM的转速和1.25Gbit/s的光信号 传输速率下最大插入损 耗为21.73 dB,可以满足旋转系统之间稳定传输光信号的要求。     

一种改进的SLNR多用户MIMO预编码方法

MU-MIMO系统中,基站在相同的时间与频率资源上与多个用户进行通信,导致不同用户之间存在同信道干扰。SLNR预编码方法将联合优化的问题转化成若干个独立优化问题,在系统性能与复杂度之间取到很好的折中。提出了一种改进的SLNR预编码方法,该方法在泄漏信号的基础上,考虑干扰信号的影响,对预编码向量进行迭代优化。仿真结果表明,与SLNR方法相比,该方法在理想CSI和非理想CSI情况下都可以进一步提高系统的吞吐量。     

Study of thermal cycling and temperature aging on PbSnAg die attach solder joints for high power modules

High power modules are still facing the challenges to increase their power output, increase the junction temperature, and increase their reliability in harsh conditions. Therefore this study is doing a detail analysis of the soldering joint between a direct copper bonded substrate and a high power IGBT made with the high lead solder alloy Pb_92.5Sn_5.0Ag_2.5. The intermetallic phases and the microstructure of standard chip to substrate solder joint will be analysed and compared to deteriorated joints coming from modules which have undergone an active thermal cycling. As expected, the as soldered joint was clearly different than solder joints made for ball grid array or small components on PCBs. The as soldered joint shows no sign of Cu₆Sn₅ intermetallic layer, but instead shows the presence of Ag₃Sn particles at the solder–chip interface. Furthermore, the failure mechanisms under active thermal cycling also seem to be different. There is no growth of intermetallic phases and no strong delamination of the device. Instead a large network of intermetallic particles (Ag₃Sn) is produced during aging and seems to degrade the solder thermal properties.     

Adaptive robust spread-spectrum receivers

We consider the problem of robust detection of a spread-spectrum (SS) signal in the presence of unknown correlated SS interference and additive non-Gaussian noise. The proposed general SS receiver structure is comprised by a vector of adaptive chip-based nonlinearities followed by an adaptive linear tap-weight filter and combines the relative merits of both nonlinear and linear signal processing. The novel characteristics of our approach are as follows. First, the nonlinear receiver front-end adapts itself to the unknown prevailing noise environment providing robust performance for a wide range of underlying noise distributions. Second, the adaptive linear tap-weight filter that follows the nonlinearly processed chip samples results in a receiver that is proven to be effective in combating SS interference as well. To determine the receiver parameters, we propose, develop, and study three adaptive schemes under a joint mean-square error (MSE), or a joint bit-error-rate (BER), or a joint MSE-BER optimization criterion. As a side result, we derive the optimum decision fusion filter for receivers that utilize hard-limiting (sign) chip nonlinearities. Numerical and simulation results demonstrate the performance of the proposed schemes and offer comparisons with the conventional matched-filter (MF), the decorrelator, the conventional minimum-variance-distortionless-response (MVDR) filter, and the sign-majority vote receiver     

Side-mode suppression for long DBR lasers

We present the results of a traveling-wave analysis of the excitation of side longitudinal modes for a nearly-single mode DBR laser with long passive waveguide. The theory accounts for the intraband and interband mode mixing and predicts their joint multiplicative broadband effect on the side mode intensities. The sign of the effect depends on the location of the lasing mode on the net gain curve, yielding strong symmetrical side-mode suppression for negative frequency detuning. The spectrum thus features a symmetrical shape with asymmetrical tuning characteristics. The effect enables almost single-mode operation of cm-long DBR lasers     

Hybrid digital-analog technique for UWB direction finding

In this letter, we propose an alternative approach for UWB direction finding using hybrid digital-analog technique. The proposed system uses an array of leading-edge pulse detection scheme in analog domain. The detection scheme is realized using tunnel diode with envelope detector and comparator latch, whose output is digital binary signal. The outputs or all array branches are then summed up to form a staircase-shaped waveform, whereby the slope of the waveform indicates the direction of impinging UWB signal. In order to detect the slope and produce the estimation of the direction, an analog differentiator joint with a peak detector is utilized. The proposed system is relatively simple and does not require high sampling rate or high speed DAC.     

基于双层字典学习的单通道语音增强方法

为了提升复杂噪声环境下语音增强效果,该文提出了一种基于双层字典学习的单通道语音增强方法。在训练阶段首先采用干净语音和噪声训练初始化特征子字典,然后基于区分性约束和抗混淆约束的优化函数训练双层联合字典,第一层字典表达语音信号和噪声的可区分分量,而第二层字典表达语音信号和噪声的易混淆成分。在测试阶段含噪语音在双层联合字典上投影得到稀疏系数矩阵,然后重构得到增强后的语音。该方法利用目标优化函数的约束性减少“交叉投影”现象的发生,降低了信号在联合字典的混淆,从而进一步提升了语音增强的效果。实验结果表明,从全局信噪比（SNR）、主观语音质量评估（PESQ）和对数频谱距离（LSD）三个方面评价,相比于基于稀疏约束非负矩阵分解和改进的维纳滤波的语音增强方法,该方法具有更好的性能,能够更有效地去除噪声。      

Joint reliability-importance of two edges in an undirected network

Joint reliability importance (JRI) of two edges in an undirected network is introduced. Concepts of joint failure importance (JFI) and marginal failure importance (MFI), duals of JRI and marginal reliability importance (MRI), are also introduced. The JRI of two edges in an undirected network is represented by the MRI of each edge in subnetworks. Relationships between JRI and MRI, JRI and JFI, and JFI and MFI are presented. From these relationships, it is shown that the JRI is an appropriate quantitative measure of the interactions of two edges in a network, with respect to source-to-terminal reliability. It can also show that the sign of the JRI of two edges can be determined without computing the JRI of these two edges in some special cases     

未来防空系统综合化对抗体系发展展望

在介绍全球主要现役防空系统的基础上,结合网络通信、人工智能技术在军事装备中的逐步推广以及商用货架产品用于军事装备的特点,预测了未来防空系统的发展趋势,分析了基于联合组网和自动控制的智能化防空系统给目前广泛采用的基于信号层的压制和欺骗式雷达对抗所带来的挑战,针对未来防空系统的特点给出了综合化对抗体系发展的三个层面并建立了对应的应用模式。最后得出网络对抗、智能反辐射以及传统传感器电子对抗综合化是未来防空系统对抗体系主要发展方向的结论。