基于多结构信息的FAT文件系统数据恢复算法

针对FAT文件系统,目前多数恢复软件难以恢复物理上非连续存储的被彻底删除文件。本文提出一种基于多结构信息的数据恢复算法,结合FAT表中簇分配信息、目录表中起始簇和时间等信息,能够较好地对一些物理非连续的文件进行恢复,提高了数据恢复的成功率。     

多假设跟踪算法研究及其应用

MHT（多假设跟踪）是一种基于多个扫描周期量测,进行数据互联的技术,理论上是解决数据关联的最优方法。文中重点阐述多假设跟踪算法中数据聚簇、假设生成及假设概率计算、假设约简与剪枝等环节。从工程角度出发,采用K—best最优假设和N-scan回溯剪枝以提高算法效率和实用性。     

一种无线网络优化中挖掘LTE小区场景突变的方法研究

研究了一种检测无线网络优化中挖掘LTE小区场景突变的方法,通过筛选过滤出场景突变的LTE小区数据集,分析确认是否由于某些性能指标或者参数原因而导致的小区场景突变,最终挖掘得到发生场景突变的LTE小区。     

标准音频信号磁带快速复制磁头的研制

分析了标准音频信号磁带快速复制磁头的磁芯结构特点,并根据磁头的漏磁通分布,给出了磁头的等效磁路。在对磁头磁阻及相关参数如磁头电感量Ｌ,磁头记录电流Ｉｒ等的计算中,考虑了磁芯材料磁导率μ↑￣的复数特性,得到了与实验一致的结果。     

基于特定产业集群生命周期下的政府政策分析

产业集群与产业、产品一样也存在生命周期。本文通过对产业集群生命周期的各阶段进行分析,简述了其各阶段的特征及表现。进而提出政府在各阶段中所处位置与应采取的措施。     

An efficient algorithm for generalized SS/TDMA scheduling with satellite cluster and intersatellite links

We consider the satellite cluster scheduling problem, which is one of the most interesting problems in the satellite communication scheduling area. This problem is known to be NP-complete, and a couple of heuristic algorithms have been developed. In this paper, we suggest another algorithm for this problem which has the same computational complexity as the best existing one and provides much better solution quality. Extensive computational simulation results are reported.     

Phase and magnetic properties of iron oxide clusters in 20CaO·20SiO2·7Fe2O3·6FeO glasses

The annealing of 20CaO·20SiO₂·7Fe₂O₃·6FeO glasses at 973K in vacuo produced clusters of iron oxide, the shape of which was nearly spherical and the diameter distributed in the narrow range 25–115Å. The phase of clusters was identified to be Fe³⁺(Fe³⁺ _{poststagger|1.30}Fe²⁺ _{poststagger|0.55}V_0.15)·O₄ in the inverse spinel structure based upon the Mössbauer spectra and x-ray diffraction profiles. The clusters exhibited superparamagnetism and their effective anisotropy energy constant was inversely proportional to the cluster diameter. The magnetization of the glasses measured by a vibrating sample magnetometer was 7.2 × 10^-6 Wbmkg^-1 at 10 kOe at room temperature and smaller than the value calculated assuming that the whole clusters have superparamagnetism. These results suggest the pinning of spins near the cluster surface.     

An Airborne Radar Clutter Tracking Algorithm Based on Multifractal and Fuzzy C-Mean Cluster

For an airborne Iookdown radar, clutter power often changes dynamically about 80 dB with wide distributions as the platform moves. Therefore, clutter tracking techniques are required to guide the selection of const false alarm rate （CFAR） schemes. In this work, clutter tracking is done in image domain and an algorithm combining multifractal and fuzzy C-mean （FCM） cluster is proposed. The clutter with large dynamic distributions in power density is converted to steady distributions of multifractal exponents by the multifractal transformation with the optimum moment. Then, later, the main lobe and side lobe are tracked from the multifractal exponents by FCM clustering method.     

松花江干流名称的历史演变和源头的变革

随着历史的进步和流域内少数民族部落国的兴衰，松花江干流的名称随之发生演变．在历史的长河中，嫩江和第二松花江都曾经做过松花江的干流，其源头都曾经当过松花江的源头．本文从历史的角度论述了松花江干流名称的演变和对源头认定的变革，并得出结论：仅从河流名称的历史演变是不能确定松花江源头的，松花江源头只能根据现代河流理论确定．     

基于CXD3142R监控系统设计

为了达到远程监控的目的,采用CXD3142R的数字成像系统构建远程监控系统,并做了远程监控的实验。实验表明,该系统通过对视频信息的记录、回放、实时传递的智能管理,实现了预置点设置、定时录像和移动侦测等功能,达到了预期的远程监控的目标。