Automatic Image Checkpoint Selection for Guider‐Follower Pedestrian Navigation

In recent years guider‐follower approaches show a promising solution to the challenging problem of last‐mile or indoor pedestrian navigation without micro‐maps or indoor floor plans for path planning. However, the success of such guider‐follower approaches is highly dependent on a set of manually and carefully chosen image or video checkpoints. This selection process is tedious and error‐prone. To address this issue, we first conduct a pilot study to understand how users as guiders select critical checkpoints from a video recorded while walking along a route, leading to a set of criteria for automatic checkpoint selection. By using these criteria, including visibility, stairs and clearness, we then implement this automation process. The key behind our technique is a lightweight, effective algorithm using left‐hand‐side and right‐hand‐side objects for path occlusion detection, which benefits both automatic checkpoint selection and occlusion‐aware path annotation on selected image checkpoints. Our experimental results show that our automatic checkpoint selection method works well in different navigation scenarios. The quality of automatically selected checkpoints is comparable to that of manually selected ones and higher than that of checkpoints by alternative automatic methods.     

国外城市社会空间演变的动力机制研究综述及政策启示

城市社会空间演变的动力机制问题一直是国外城市社会学、地理学、人口学、规划学等学科研究的热点，形成了各种理论流派。当前，在经济全球化和市场化改革不断深入的背景下，中国城市社会空间正发生类似于西方城市社会空间的演变趋势。因此，对国外城市社会空间演变的动力机制理论进行研究，可以为正在发生的中国城市社会空间问题提供可供借鉴的理论解释，并且也为合理的城市治理公共政策提供理论依据。     

基于主题模型与信息熵的中文文档自动摘要技术研究

提出了一种基于LDA模型以及信息熵的文档自动摘要技术,即通过LDA模型对文档进行浅层语义分析,得到文档的主题分布以及不同主题下的词语分布;通过对主题的分析,可以得到最能代表文档中心思想的主题,以及该主题下的词语分布。同时,提出了一种新的基于信息熵的度量句子重要性的方法,并将该方法应用于文档的关键句抽取过程中。该方法将文档中句子的出现看成一个随机变量,通过对随机变量建模并度量它的信息熵来选取文档中的关键性语句。实验结果表明,应用主题模型与信息熵摘取的文档摘要能有效地从文档中摘出中心句。     

微生物学中好氧颗粒污泥的形成机理

全面地综述了国内外在好氧颗粒污泥方面的研究现状,包括好氧颗粒污泥的基本特征、颗粒化过程中的影响因素、形成机理及其微生物组成,以及在污水处理方面的优势。同时,对其未来的研究和发展趋势作了展望。     

国内外干式拉丝润滑剂的使用

综述我国拉丝行业采用国内外拉丝润滑剂的现状，简介热丝润滑机理及高速干式拉拔对润滑剂的性能要求，指出拉丝中与润滑剂有关的问题及其对策。     

地理信息系统在环保领域的应用综述

地理信息系统是一门以计算机为基础的新兴技术，围绕着这项技术的研究、开发和应用，形成了一门交叉性、边缘性学科，其在环保领域的应用将有力地促进环保工作的开展。本文首先简要介绍了GIS技术，而后综合论述了其在环保领域中的应用。     

有机膦酸分析方法的研究进展

有机膦酸具有化学稳定性强、耐高温、耐氧化、不易水解、络合性高、易生物降解等特点。分析方法主要包括络合滴定法、电位滴定法、喹啉磷钼酸盐重量法、钼蓝比色法、核磁共振分析法、红外光谱分析法、离子交换色谱法、单晶X-射线衍射技术、电喷雾—质谱法、电喷雾质谱负离子检测、高效液相色谱—电喷雾质谱法、离子交换色谱-电感耦合等离子体-质谱法、高效液相色谱-质谱法、离子对高效液相色谱法和紫外法等。综述了有机膦酸分析方法的研究进展,归纳了各类方法的优缺点,并对其发展趋势进行了展望。     

第三代移动通信智能天线的研究现状及发展趋势分析

本文首先简单地介绍移动通信发展以及第三代移动通信（3G）的技术特征和实现目标，并阐述了如何用多址来解决通信资源紧缺的问题，随后重点讲述智能天线的定义、优点、组成、工作原理、信道模型以及要解决的关键技术问题和发展现状。最后，提出了智能空分多址的概念，并对智能天线未来的发展进行了分析和预测。     

Multimedia technologies for structuring and retrieval of TV news

Because of the media digitization, a large amount of information such as speech, audio and video data is produced everyday. In order to retrieve data from these databases quickly and precisely, multimedia technologies for structuring and retrieving of speech, audio and video data are strongly required. In this paper, we overview the multimedia technologies such as structuring and retrieval of speech, audio and video data, speaker indexing, audio summarization and cross media retrieval existing today for TV news detabase. The main purpose of structuring is to produce tables of contents and indices from audio and video data automatically. In order to make these technologies feasible, first, processing units such as words on audio data and shots on video data are extracted. On a second step, they are meaningfully integrated into topics. Furthermore, the units extracted from different types of media are integrated for higher functions. Yasuo Ariki, Ph.D.: He is a Professor in the Department of Electronics and Informatics at the Ryukoku University. He received his B.E., M.E. and Ph.D. in information science from Kyoto University in 1974, 1976 and 1979, respectively. He had been an Assistant in Kyoto University from 1980 to 1990, and stayed at Edinburgh University as visiting academic from 1987 to 1990. His research interests are in speech and image recognition and in information retrieval and database. He is a member of IPSJ, IEICE, ASJ, Soc. Artif. Intel. and IEEE.