查询词典 navigation key

To avoid the collision accidents of ships at sea, with the universalizing and application of computer, and the development and maturity of the technology of Expert System and Artificial Intelligent, this paper developed an intelligent collision avoidance expert system for navigation. The main research work centers on several aspects, which will be represented as below:By the navigation rules" understanding and analyzing, and by the navigation experience and navigation samples" collecting and trimming, we put forth and build a multi-unit and layering KB systematic structure, and implement the KBM. According to features of different knowledge, we adopt multifarious KR, such as: frame KR, production rule KR, procedure KR. We also build a multi-inference system, which based on analog inference, forward illation inference, conversion inference and meta-rule inference. At the same time, we develop each reasoning algorithm. For some problems in collision avoidance region during the building of the expert system, we put forth and build a set of models to solve them using neural network technology.

为了避免船舶间碰撞事故的发生，结合计算机技术在各类船舶中的普及与应用、专家系统技术及人工智能技术的发展、成熟，本文研制、开发了一种具有一定智能的航海避碰专家系统，主要内容包括以下几个方面：通过对航海规则的理解与分析，对航海经验、航海实例的搜集、整理，提出并建立起了航海避碰专家系统的多元分层知识库体系结构，并实现了知识库的管理；根据不同知识的特点，分别采用了框架、产生式规则、过程等多种知识表示方法；提出了一种基于类比推理、正向演绎推理、换位推理及元级推理等的多种推理机制，并建立起了相应的推理算法；引入神经网络技术，针对在建立专家系统过程中所遇到的有关避碰领域内的一些难题，提出并建立了相应解决问题的模型，其中包括：船舶类型的识别，会遇态势的分类及避碰危险的评估。

Navigation of 3375.net individual character next the article that I look for to including individual character navigation one piece casually, next I am used to the individual character navigation inside [navigation of Url=http:// Www.3375.net] individual character undertakes replacing.

net个性导航然后我就随便找一篇包含着个性导航的文章，然后我对里面的个性导航用[url=http：// www.3375.net]个性导航进行替换。

The method includes steps: digital watermark technique is adopted to hide information of key data in not key data codes of compressed image; under protection of digital watermark, using protective backup for key data detects whether normal transmitted key data is correct or not so as to detect error code; carrying out cyclic mutual backup by using macro blocks in same positions in front and back macro block set; embedding coded motion vector in form of digital watermark to DCT transformation coefficient, and ensuring that video data are not influenced as best as one can; when error code occurs, if key data backup is correct, then the backup replaces former key data; otherwise, using mean value of key data in adjacent macro blocks within same frame to replace former key data approximately.

本发明中，采用数字水印技术在压缩图像的非关键数据编码中隐藏关键数据信息；通过数字水印保护下的关键数据保护备份来检测正常传输的关键数据是否正确，由此来检测传输误码；用前后宏块组中相同位置的宏块进行循环相互备份；对运动向量进行编码，然后以数字水印的形式嵌入到相对不重要的DCT变换系数中，同时保证视频数据尽量不受影响；在误码发生时，如果关键数据备份正确，则直接替代原关键数据，否则用同一帧内相邻宏块的关键数据的平均值近似替代原关键数据。

The database such as the vessel database, navigation aids facility database, hydro-meteorological information database and the database of the port facility and above–water facility in the area of responsibility are set up that the MSA can realize the vessels entering or leaving port management, above-water and underwater construction management, navigation alarm and announcement publishing, above water dangerous condition, accident , water area pollution , and vessel alarm monitoring in the area of responsibility, as well as master the circumstances in the water area of the accident and dangerous conditions and the dynamic positions of the navigation vessels.

建立了船舶数据库、助航设施数据库、水文气象数据库、港口设施、辖区水上设施数据库。实现海事局对船舶进出港管理、水上水下施工管理、发布航行警告、航行通告、监控辖区水上险情、交通事故、水域污染、船舶报警，掌握事故、险情水域情况以及有关巡航船舶位置动态。

with the development of satellite navigation communication,antenna is a very important unit,performance of the satellite navigation communication system is affected by it partly.a new type of bifilar helix for satellite navigation communication system is introduced,and the traving-wave bifilar helix is analyzed briefly.meanwhile,the design and the test results are given.the results show that the antenna possesses excellent circular hemispherical beam with wide angle circular polarization and better impedance match,and has a compact structure and high integration.it can be applied in caps systems successful.

小 摘要：随着卫星导航通信技术的迅速发展，天线作为卫星导航通信系统中的重要部分，在一定程度上决定着卫星导航通信系统的性能。介绍一种用于卫星导航通信系统的双臂螺旋天线，讲述爬行波式螺旋天线的设计过程，并给出最终测试结果。结果表明，该天线具有优良的圆对称半球波束，良好的广角圆极化特性和优良的阻抗匹配特性，其结构简单、紧凑，为通信入站回传提供了一种优良的选择。

It has strong integration capability, and has realized navigation-aids information distribution based on WEBGIS at the first time. It strongly promotes navigation-aids daily management and maintenance, and this system provides technique guarantee for ships and marine departments to acquire navigation-aids information in time, by rule and line expediently.

该系统信息资源整合能力强，并首次实现基于电子海图基础数据的航标信息发布新技术，有力地促进了航标日常管理与维护，为船舶及涉海部门及时、准确、方便获取航标信息提供了技术保障。

The inertial navigation system is needed in the development of navigation, aviation and spaceflight. Communication system is one of the most important part in the data transmission of inertial alignment, the veracity, anti-interference and secrecy of which has an impact on the navigation, especially for data transmission between the aircraft carrier and carrier plane.

航海、航空和航天事业的迅速发展离不开惯性导航系统，惯性初始对准数据的传输离不开通信系统，而数据传输的准确性、抗干扰性、高保密性是事关导航的关键，其中在航母与舰载机之间数据传输的可靠性、保密性尤为重要。

However, keywords can only represent the simple content, which easily dissever the relevancy of the content The deep-content representation and application are not developed, so semantic navigation is not satisfied at present. Time mechanism is a kind of navigation mechanisms that uses time for the signpost, and determines navigation route according to the time of occurrence.

时序机制指以时间为导航路标、根据事物发生的时间顺序确定访问路径的一种导航机制，主要应用于WWW信息空间中以时问顺序为线索组织信息的结构中；空间机制指依据对象间的空间关联，为用户指引路径，提供导航路标的机制，应用于具有空间特征的结构中；社会机制指利用先行者的经验、建议为后来者指引路径的行为，原来主要应用在推荐系统、协作系统中，目前已经在主流的信息检索系统中得到了应用，如在CNKl知识网络服务平台（CNS 5.0）中的应用。

Strapdown inertial navigation system is a kind of very advanced inertial navigation technology,and it is the developing direction of inertial navigation.

捷联式惯性导航系统是一种十分先进的惯性导航技术，是近年来惯性技术的一个发展方向。

Strap-down inertial navigation system is a kind of advanced inertial navigation technology, which is the developing direction of inertial navigation.

捷联式惯性导航系统是一种先进的惯性导航技术，是近年来惯性技术的一个发展方向。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48