But it is difficult to read data . the most discommodiousness is that the data read ca n ' t be saved and dealed with 精度尚可，能达到要求但读数困难，也不能进行数据的保存和后处理。
2.
Changchun is not a big city but it is favorite in my heart . i now live in beijing , but i do not like beijing because its discommodiousness . i love changchun 长春不大，可处处洋溢着蓬勃的气息。这种气息是我爱的。每当回到从前的土地就会由内而外地爽。长春并不古老也不新潮，城市不繁华也不残破。每个人不虚荣也不卑贱。我爱我的城市。
3.
At present , the most of vtr which are used in watch - control occasion for speciality are short of a uniform control - check - alarm system , which brings on the discommodiousness of operation and the user can not know the time of occurring a fault , which reduces the reliability of the watch - control system . therefor , at first , i carefully analyze the servo theory of the vtr which had been produced by chmavc with k mechanism to find out the work rule of the control signal ; second , take out some right control signal ; then for dealing with the problem of vtr in use for watch - control , i choose some right components to design the uniform control system for many special vtr with protel software . it mainly includes the following functions : operation functions of all vtr ( for example : power , play , ff , rew , stop , rec , eject , fwd , rwd , sp , lp ) was controlled by line at the same time ; in , the process of recording , when the tape walks to the end or stops by itself , the system gives an alarm and shows the number of the wrong vtr ; in the process of recording , the system gives an alarm and shows the number of the wrong vtr when the video signal from vidicon is losed ; the system controls all vtr to record on the non - working time when there is something wrong in the guarding section ; the system controls the video from vtr to switch to right monitor 目前，用在监控场合的业务用录像机普遍缺乏一个统一的控制及检测报警系统，这就导致了操作的不方便和出现了故障用户不知道，降低了监控系统的可靠性，为此，我首先对华录松下生产的k机芯的录像机伺服原理进行仔细分析，找出各个伺服控制信号的控制变化规律；然后从中选出合适的控制信号；针对目前录像机在实际监控使用过程中存在的问题，选用合适的元器件；运用protel绘图软件，设计了这个多台业务用录像机的统一控制系统，她主要包括以下功能：录像机操作功能(如power play ff rew stop rec eject及正寻反寻带速设定等)的统一线控控制功能；磁带在记录过程中，磁带到头和磁带自己“偷停”的报警，并要能显示出具体是哪一台录像机；在记录状态下，摄像头输入信号丢失报警，并要能显示出具体是哪一台录像机；在休息或其他不需要记录时，一旦警戒区有情况，则控制所有机器自动进入录像状态的功能；从录像机输出的监控图像信号对监视器的切换功能。
4.
Because 3d surface model contains huge number of triangles , a mesh simplification algorithm based on triangle edges shrinkages is presented in this paper to speed up the rendering in real time . in chapter four , the cutting of reconstructed 3d models is explored . in order to observe expediently the size and interspaces structure of inner tissues and avoid the discommodiousness of surface reconstruction , a simple cutting methods based on ray - casting algorithm is presented to get the inner images information 第三章主要对marchingcubes ( mc )表面重建算法进行描述， mc算法是基于规则体数据抽取等值面的经典算法，本文实现了这种等值面构建表面模型的算法，并对其算法的二义性进行了相应的处理；针对其重建速度较慢的问题，提出了体素间相关性处理的方法来加快重建速度；并对其生成的表面几何模型所包含三角面片数量巨大的问题，提出一种快速有效的三角形边收缩算法进行网格简化，提高了表面模型的绘制速度。
