排序方式: 共有42条查询结果,搜索用时 15 毫秒
1.
利用MS1000高精度旋转扫描声纳系统在渤海海域平台上或近平台区域进行海底管道电缆及地貌调查,可以有效的获得近平台区域的海底管道电缆精确位置、障碍物大小和分布情况以及周边地貌情况。本文深入讨论旋转扫描声纳系统在近平台区域海底管道电缆及地貌调查的方法、技术特点及技术优势,有效的解决了海上近平台区域海底管道电缆和地貌调查较难实现的困难。为以后近平台区域海底管道电缆及地貌调查提供了指导、参考及借鉴。 相似文献
2.
3.
4.
介绍了漏磁检测的基本原理,分析了管道缺陷的漏磁信号与缺陷几何参数的关系.应用BP神经网络进行了管道缺陷参数的定量识别,识别结果的误差小于10%,完全满足实际检测的要求. 相似文献
5.
空间数据库技术和GIS二次开发平台技术的成熟,为地理信息技术的大规模应用提供了基础,各行各业都在升级原有的GIS系统或进行全新的更高级别的应用开发.在众多GIS系统中,由于管线信息系统的特殊性,很多单位都面临着如何把现有管线信息系统向ArcGIS平台升级的问题,因此如何提高管线数据的安全性并加强应用系统的功能,以支持更高的管线信息应用的问题,值得研究. 相似文献
6.
新课改背景下信息技术教师角色的重定位 总被引:2,自引:0,他引:2
通过调查了解信息技术教育的现状,文章积极反思了当前中小学信息技术教师面临的问题,以专业化发展视角对新课改背景下信息技术教师的角色定位进行了认真思考,主要从信息技术教师应成为学科知识的权威、课程的建设者和开发者、学生学习的知心伙伴、教师信息素养的直接培训者等方面进行了阐述。 相似文献
7.
In H.264, computational complexity and memory access of deblocking filters are variable, dependent on video contents. This paper proposes a VLSI architecture of deblocking filters with adaptive dynamic power, which avoids redundant computations and memory accesses by precluding the blocks that can be skipped. The vertical and horizontal edges are simultaneously processed in an advanced scan order to speed up the decoder. As a result, dynamic power of the proposed architecture can be reduced adaptively (up to about 89%) for different videos, and the off-chip memory access is improved when compared to previous designs. Moreover, the processing capability of the proposed architecture is in particular appropriate for real-time deblocking of high-definition television (HDTV, 1920× 1080 pixels/frame, 60 frames/s video signals) video operation at 62 MHz. Using the proposed architecture, power can be reduced by up to about 89% and processing time by from 25% to 81% compared with previous designs. 相似文献
8.
This study presents a new method of 4-pipelined high-performance split multiply-accumulator (MAC) architecture, which is capable of supporting multiple precisions developed for media processors. To speed up the design further, a novel partial product compression circuit based on interleaved adders and a modified hybrid partial product reduction tree (PPRT) scheme are proposed. The MAC can perform 1-way 32-bit, 4-way 16-bit signed/unsigned multiply or multiply-accumulate operations and 2-way parallel multiply add (PMADD) operations at a high frequency of 1.25 GHz under worst-case conditions and 1.67 GHz under typical-case conditions, respectively. Compared with the MAC in 32-bit microprocessor without interlocked piped stages (MIPS), the proposed design shows a great advantage in speed. Moreover, an improvement of up to 32% in throughput is achieved. The MAC design has been fabricated with Taiwan Semiconductor Manufacturing Company (TSMC) 90-nm CMOS standard cell technology and has passed a functional test. 相似文献
9.
10.
《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献