南方全站仪测量文件的转换

介绍南方全站仪测量文件转换的原理、方法及程序框图。

Excel2007在三维控制测量数据处理中的应用

本文介绍了Excel 2007的功能和TOPCON全站仪数据采集的观测方法和步骤,控制测量外业测量成果的信息提取、测量平差处理的方法及Excel VBA程序实现。

使用“格式文件”将徕卡仪器数据导出成cass格式的方法

本文探讨了如何使用格式文件导出cass格式文件的方法,并给出了具体的格式文件和注意事项。

大尺度3D激光扫描技术及其应用

针对大物体3D原型及测量的3D激光扫描技术近年来得到了飞速的发展.与其他3D测量技术相比,大尺度3D激光扫描技术可以在中、大距离内快速捕获大物体全区域的数字原型,特别是考虑时间和成本,大尺度3D激光扫描技术在不同环境和地点中捕获复杂物体的3D数据是十分奏效的.在详细介绍大尺度3D激光扫描技术原理的基础上,给出了在建筑结构、隧道工程等方面的一些应用实例.实际应用结果表明,大尺度3D激光扫描技术是各种反求工程对称应用的一种独特的工具或方法.

Near-duplicate document detection with improved similarity measurement

To quickly find documents with high similarity in existing documentation sets, fingerprint group merging retrieval algorithm is proposed to address both sides of the problem:a given similarity threshold could not be too low and fewer fingerprints could lead to low accuracy. It can be proved that the efficiency of similarity retrieval is improved by fingerprint group merging retrieval algorithm with lower similarity threshold. Experiments with the lower similarity threshold r=0.7 and high fingerprint bits k=400 demonstrate that the CPU time-consuming cost decreases from 1 921 s to 273 s. Theoretical analysis and experimental results verify the effectiveness of this method.

An Empirical Model for Estimating the Zonal Mean Aerosol Extinction Profiles from SAGE II Measurements

This paper presents an empirical model for estimating the zonal mean aerosol extinction profiles in the stratosphere over 10°-wide latitude bands between 60°S and 60°N, on the basis of Stratospheric Aerosol and Gas Experiment(SAGE) II aerosol extinction measurements at 1.02, 0.525, and 0.452 μm during the volcanically quiescent period between 1998–2004. First, an empirical model is developed for calculating the stratospheric aerosol extinction profiles at 1.02 μm. Then, starting from the 1.02 μm extinction profile and an exponential spectral dependence, an empirical algorithm is developed that allows the aerosol extinction profiles at other wavelengths to be calculated. Comparisons of the model-calculated aerosol extinction profiles at the wavelengths of 1.02, 0.525, and 0.452 μm and the SAGE II measurements show that the model-calculated aerosol extinction coefficients conform well with the SAGE II values, with the relative differences generally being within 15% from 2 km above the tropopause to 40 km. The model-calculated stratospheric aerosol optical depths at the three wavelengths are also in good agreement with the corresponding optical depths derived from the SAGE II measurements, with the relative differences being within 0.9% for all latitude bands. This paper provides a useful tool in simulating zonal mean aerosol extinction profiles, which can be used as representative background stratospheric aerosols in view of atmospheric modeling and remote sensing retrievals.

Understanding BitTorrent Through Real Measurements

In this paper, we present the resuks of the BitTorrent measurement study. Two sources of BitTorrent data were utilised： meta- data files and the logs of one of the currently most popular BitTorrent clients--gTorrent. Experimental data were collected for fifteen days from the popular torrent-discovery site thepiratebay.org （more than 30 000 torrents were captured and analysed）. During this pe- riod the activity and logs of an unmodified version of μTorrent client downloading ses- sions were also captured. The obtained ex- perimental results are swarm-oriented, which allows us to look at BitTorrent and its users from an exchanged resources perspective. Moreover, comparative analysis of the clients＇ connections with and without the μTP proto- col is carried out to verify the extent to which μTP improves BitTorrent transmissions. To the authors＇ best knowledge, none of the previous studies have addressed these issues.

Measuring the Complexity of Business Organization and Business Software Using Analytic Hierarchy Process （AHP）

The paper shows a proposition of metrics for measuring the complexity of the business organization and business software. The metrics is based on a subjective estimation of complexity of the elements from a part of the structure of business organization or business software in relation to other elements from the observed part. Estimation is performed based on the measuring scale for comparison of complexity of elements, and reaching a final conclusion on the complexity of elements in relation to other elements, through the Analytic Hierarchy Process （AHP）. Defined in this manner, the metrics represents a unique metrics for measuring the complexity of elements of business organization and business software, which enables their comparison. The paper also presents a short overview of existing metrics for measuring the complexity of business organization and business software.

Test of a low-mass contact binary model by comparing the relations obtained from theory with those from observations

The W UMa-type contact binaries have been observed for several decades.To construct the evolutionary model for W UMa-type contact binaries,many difficulties were encountered due to the existence of complicated physical processes in such systems.The model introduced by Huang,Song and Bi includes some special and unique understandings of the physical processes of contact binaries.It is necessary to test whether this model can be used for W UMa-type contact binaries.The best way to test a theoretical model is to know whether this model can explain the observational phenomena of such systems.For this aim,a comparison is performed for the relations of mass-luminosity,mass-radius,and the distribution in the HR diagram obtained from the model introduced by Huang et al.and those from the astronomical observations.The result of the comparison indicates that this model can be applied to W UMa-type contact binaries and can explain the observational phenomena of such binaries.

An improved phase measurement method of integrated pulse profile for pulsar

Integrated profile is one of the basic characteristic of X-ray pulsar. Gaussian function fit is used to model the components of X-ray pulsar profile, and it is combined with Poisson distribution model of X-ray pulsar to analyze Cramer-Rao low bound （CRLB） of phase, phase rate estimation and relation between CRLB and profile components. Then, a time domain method using minimum entropy is proposed for profile phase and phase rate estimation, and its effectiveness is explained using simulation examples.

Modeling and Doppler measurement of X-ray pulsar

Generally,the Doppler caused by the velocity of the detector leads to distortion of the integrated profile of the X-ray pulsar,on the contrary,if the distortion can be used to measure the Doppler,then the velocity of the detector is easy to be solved.In view of this,the correlation of the periodic error arise from the Doppler and the integrated profile was analyzed,then,based on the Poisson distribution model of the X-ray Pulsar,a new signal model and the concept of the profile entropy was defined.Furthermore,the directly cumulated profile of the signal was modeled with the Doppler as a parameter,and then the Doppler was solved via optimal method.Simultaneously,the performance of phase measurement based on this method was studded.The analysis shows that this method can get rid of the periodic error due to the discrete sampling,and can obtain continuous phase estimation.The experiment verification shows the consistency of the theory and the experiment.