【摘 要】
：
The observatory control system(OCS),a part of automated control of Large Sky Area Multi-Object Fibre Spectroscopic Telescope(LAMOST),runs on the CentOS6 platfor
【机 构】
：
Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,
论文部分内容阅读
The observatory control system(OCS),a part of automated control of Large Sky Area Multi-Object Fibre Spectroscopic Telescope(LAMOST),runs on the CentOS6 platform and implements the communication between modules based on Common Object Request Broker Architecture(CORBA).However,CORBA is complicated and has limited development support;moreover,the official support for CentOS6 has ended.OCS inherently has some shortcomings such as the over-concentration of control and the blocking of device status processing,which hinder the realization of automated observation control of LAMOST.Therefore,this study designs and implements a universal observation control system(UOCS)for optical telescopes.The UOCS takes the device command as the basic execution unit,controls the device execution logic using observation script,controls the observation logic by event-driven messaging,and realizes mutual decoupling between modules via a distributed control mode,thereby ensuring high system robustness.The UOCS performs significantly better than OCS in terms of the observation performance,operator complexity,and communication error.Currently,UOCS is applied to the automated control of some devices and subsystems in LAMOST observation.It will be applied to the automated observation control of Multi-channel Photometric Survey Telescope by 2021.
其他文献
We report the discovery of three new pulsars in the globular cluster(GC)NGC 6517,namely NGC 6517 E,F and G,made with the Five-hundred-meter Aperture Spherical r
Accurate estimation of cratering asymmetry on the Moon is crucial for understanding Moon evolution history.Early studies of cratering asymmetry have omitted the contributions of high lunar obliquity and inclination.Here,we include lunar obliquity and incl
区域物流需求的快速增长,对拉动区域经济增长及促进区域产业优化升级起到重要作用。应用灰色系统理论优势分析方法对河南省物流需求影响因素开展分析,依据分析结果建立河南省物流需求的GM(1,1)模型,并对该区域未来物流需求进行了预测;影响因素分析结果及物流需求预测数据可以为该地区在制定区域物流发展规划时提供参考。
针对双线圈无线充电系统电能传输距离较短的问题,采用增加中继线圈的方法来提高传输距离,首先利用电路互感理论对系统进行建模分析,分别推导出系统传输效率关于线圈间距的函
The Astrophysics Directorate of CONIDA has installed two radio spectrometer stations belonging to the e-CALLISTO network in Lima,Peru.Given their strategic loca
利用Pro/E建立了混凝土搅拌车罐体的简化模型,导入有限元软件ABAQUS进行数值分析,模拟搅拌时的流场和流速的空间分布以及罐体外壳及搅拌叶片的应力分布。通过CEL(耦合欧拉-拉格朗日)分析,模拟了搅拌车进料、搅拌、出料三种动态过程。研究表明,在常规运输情况下,叶片的搅拌速度能够保证混凝土的均匀性,但罐体外壳和搅拌叶片在进料及出料工作状态下容易屈服。
为了研究大跨弯连续刚构桥自振频率变化规律,依据Rayleigh基本理论,推导桥梁自振频率的计算公式,并以某一典型桥梁为依托工程,运用通用软件ANSYS,通过变化结构的曲率半径,建立24种仿真模型,获取了桥梁结构一阶振动频率变化规律;修正自振频率的计算公式,并通过实际工程进行验证公式的适用性。结果表明:连续刚构桥第一阶振动以桥墩的纵向振动为主;计算值与算例验证误差为5%,满足工程需求。
针对传统曲线拟合方法在书写机器人中不够平滑和精度不高的问题,在分析三次样条曲线和NURBS样条曲线拟合方法优缺点的基础上,改进了样条曲线的拟合方法。首先利用弦误差提取合适的控制点,然后进行三次样条插值,生成的插补点通过相邻点间连线的夹角约束进行筛选,筛选后的插补点作为NURBS曲线的控制点,最后进行曲线拟合。通过MATLAB平台进行仿真和机器人书写实验,结果表明,改进方法拟合的平滑曲线可以通过控制点,具有更高拟合精度,且保留了传统B样条曲线的局部性和凸包性,可优化机器人的运动轨迹。
环氧沥青混凝土作为桥面铺装材料,因其强度高,刚度大,高温稳定性等特点,在桥梁铺装中得到广泛应用。但是,对纵坡状态下的环氧沥青混凝土桥面铺装的研究较少,选取5%纵坡的桥面二维结构,建立桥面铺装与车轮荷载的接触体系,对纵坡状态下,环氧沥青混凝土桥面铺装进行有限元分析,对比平坡状态下的接触状况。结果表明:在平坡状态下,环氧沥青混凝土桥面铺装,最大应力为14.69 MPa,最小应力为0 MPa.应力最大处为接触点处,最小处在接触点最远处。由此可知,在平坡状态下,环氧沥青桥面铺装结构,最不利状态即为接触点,距离越远
大多数的聚类算法都只是针对数值型数据,而在现实世界中,经常会遇到混合了数值属性和分类属性的数据,因此对混合数据的有效聚类是一个非常有挑战的研究问题。针对混合数据的基于熵的相似矩阵,利用阈值法构造相对应的复杂网络,对生成的复杂网络进行社团结构划分,复杂网络的一种社团结构划分就对应混合数据的一种聚类结果。通过三个实际混合数据集上的测试发现,与混合数据五种聚类算法:DP-MD-FN(density-based clustering algorithm for mixed type data employing