融合锚词抽取的海量短文本主题层次挖掘

从短文本集中挖掘不同粒度的主题、构建主题的层次结构在舆情分析、视觉检测、语义挖掘和图谱构建等方面具有重要应用.围绕如何从短文本集中分层次地挖掘主题,在修改传统短语定义的基础上,提出了融合锚词抽取的海量短文本主题层次挖掘框架.提出的主题层次挖掘框架首先基于词共现图实现主题推断和锚词抽取;然后,应用关联规则挖掘频繁锚词短语;最后,采用排序方法量化锚词短语以寻找最具代表性的主题短语.与已有的基于词共现图构建主题层次的方法相比,融合了锚词抽取的词共现图分析方法更有利于构建层次更高的主题.在2个实际的中文短文本数据集上执行实验,结果表明提出的方法挖掘的短语能较好地解释主题和用于分类预测.     

电子工单处理系统的关键技术

本文分析了电子工单处理系统的任务和特点。根据工单处理过程的多样性和易变性，提出了一种规则驱动的分布式工单处理系统，并对该系统的软件体系结构、工单处理中的规则以及工单处理的瓶颈和对策给予了介绍。     

Enabling efficient reprogramming through reduction of executable modules in networked embedded systems

We present a systematic modular design approach for networked embedded systems. We effectively reduce the module file size to enable efficient network reprogramming, while at the same time retain necessary information to maintain module flexibility. We further handle module dependencies in a fine-grained manner, which improves system reliability while keeping the system configuration to its minimum requirement. We have implemented the modular approach based on a micro embedded OS, SenSpire OS, for AVR and MSP430 platforms. The evaluation results show that the proposed SELF module file format is 4.6–7.6 times smaller than the standard ELF format, and is 1.6–2.4 times smaller than the CELF format (a Compact ELF format for the Contiki OS). SELF retains necessary information to enable flexible modular programming and inter-module communications. We have further developed a long-term energy efficiency model to explore the tradeoffs of different reprogramming approaches.     

NON-PARAMETRIC TOPIC MODEL FOR DISCOVERING GEOGRAPHICAL TOPIC VARIATIONS

This paper presents a non-parametric topic model that captures not only the latent topics in text collections, but also how the topics change over space. Unlike other recent work that relies on either Gaussian assumptions or diseretization of locations, here topics are associated with a distance dependent Chinese Restaurant Process （ddCRP）, and for each document, the observed words are influenced by the document＇s GPS-tag. Our model allows both unbound number and flexible distribution of the geographical variations of the topics＇ content. We develop a Gibbs sampler for the proposal, and compare it with existing models on a real data set basis.     

Modular design and improvement of the management system in the smart home with the use of interval multiset estimates

The paper addresses modular design and improvement/extension of the management system in the smart home and the building automation system (BAS). The design procedure is based on the hierarchical morphological multicriteria design (HMMD) approach: (a) construction of a tree-like system model, (b) generation of design alternatives for leaf nodes of the system model, (c) the bottom-up process: (i) selection of design alternatives for system parts/components and (ii) composition of the selected alternatives into a resultant combination. Here, the HMMD approach with interval multiset estimates for design alternatives is used. The system improvement scheme is based on the following: (a) upgrade of the system components (strategy 1), (b) system extension by adding an additional part (strategy 2). The multiple choice problem with interval multiset estimates for improvement operations is used in system improvement procedure. Two basic applied illustrative numerical examples are considered: (1) a modular management system for the smart home and (2) a modular building automation system consisting of four parts.     

QoS guarantees for multimedia services on a TDMA-based satellitenetwork

This article describes a proposed network architecture for both the ground and space segments of a satellite network supporting multimedia services with quality of service (QoS) guarantees. The space segment proposal is geared toward a TDMA-based satellite network comprising many nongeostationary satellites, while the ground segment proposal does not put any restriction an the satellite network. The ground segment proposal is based on the new ATM adaptation layer 2 (AAL2) which we consider to have a major role to play in offering an efficient way to provide multimedia services over ATM networks. Indeed, it allows easy encapsulation of the complete set of media component sessions which forms a multimedia transaction into a single ATM virtual channel connection. An additional advantage of AAL2 is that it can run over any arbitrary slotted access system independent of the ATM format (i.e., without transporting the ATM cell headers). This is important for efficient interfacing of the ground and space segments. The space segment proposal aims at providing a robust, easily managed and controlled architecture to guarantee QoS by using a combination of connectionless and connection-oriented techniques. This is achieved by: defining a fixed logical network architecture (i.e., independent of the motion of the satellites); limiting the functionality of the switches in the sky; and using adequate addressing and routing procedures     

微博热点话题检测系统的设计与实现

本文描述了一个微博热点检测系统。管理者通过它可以快速了解正在发生的或是已发生的微博热点事件。系统采用调用微博API接口与改进爬虫程序相结合的方式获取网页数据;由于网络数据量巨大,为了提高效率,还采用了网页清理技术;重点介绍了话题活性模型的方法,系统可以根据时间坐标快速寻找热点话题,提高了热点话题发现的效率,大大降低了热点话题发现的时间复杂度。     

用Python语言跨平台分析处理电子表格

在日常工作中经常需要分析和处理电子表格,这就容易涉及很多重复性的工作。有时还要求软件能在不同操作系统下使用。鉴于此背景,基于降低手工处理复杂电子表格重复性操作强度,且不用更改代码便可以在不同操作系统(Windows、Linux、MAC等等)上运行的目的,采用目前流行的动态语言Python编程的方式实现了电子表格的处理任务。通过实际分析几十万条客服工单电子表格,得出了通过编写程序可以大幅度降低人工操作强度,减少工作时间,且能跨平台使用的结论。     

Spoken document understanding and organization

Spoken documents (or associated multimedia content) are in fact better understood and reorganized in a way that retrieval/browsing can be performed easily. For example, they are now in the form of short paragraphs, properly organized in some hierarchical visual presentation with titles/summaries/topic labels as references for retrieval and browsing. The retrieval can be performed based on the full content, the summaries/titles/topic labels, or both. In this article, this is referred to as spoken document understanding and organization for efficient retrieval/browsing applications. The purpose of this article is to present a concise, comprehensive, and integrated overview of related areas in a unified context of spoken document understanding and organization for efficient retrieval/browsing applications. In addition, we present an initial prototype system we developed at National Taiwan University as a new example of integrating the various technologies and functionalities.     

基于维基百科和网页相似度分析的主题爬行策略

针对当前常用爬虫爬行策略的不足,提出结合维基百科和网页相似度分析的主题爬行策略。利用维基百科分类树的结构对主题进行描述;下载网页后对网页进行相应处理,结合文本相关性和Web链接分析来计算候选链接的优先级。实验表明,该爬虫搜索结果与主题相关度明显高于传统爬虫,爬虫爬全率有一定提高。该主题爬虫主题描述方法和爬行策略有一定的推广价值,尤其在转基因生物领域中,该爬虫中有一定的创新性。     

Pigeon: a wireless two-way messaging system

Wireless messaging is an integral component of universal personal communication services (PCSs). Its growth is likely to be further fueled by the availability of new data capabilities in the new PCS air interfaces. Our research focuses on high-level issues such as new messaging functionalities, high-layer protocols, and overall system design. Pigeon is our proposal of a wireless two-way messaging system. The novelty of our system lies in: (1) the techniques used in mitigating the wireless media and end device constraints, (2) the functionalities provided, and (3) its modular architecture. Examples of (1) include the use of asymmetric protocols and the introduction of user agents. Examples of (2) include group addressing, transaction support, and flexible messages. The modularity of Pigeon allows its individual components to be adopted by specific systems, A prototype of Pigeon has been implemented, and is operational at Bell Laboratories. We describe the motivation, design, and functionality of Pigeon. We also present, as an example, a mapping of Pigeon to a standard cellular/PCS messaging system     

基于GSM技术的AICPS容错重构与安全管理研究

采用基于TLS三层栈的先进的航电系统结构,阐述了机载综合核心处理系统AICPS的软件结构和组成。其通用系统管理GSM分为健康监控、故障管理、配置管理和安全管理4个软件功能模块,以及飞机级、综合区级、资源元素级共三级。基于GSM、运行蓝图和虚通道,论述了AICPS的故障管理技术、容错重构机制和安全管理策略,由于航空电子系统高安全、高可靠性等特点,研究故障管理、容错重构以及安全管理非常必要,其研究对于提高我国航空电子系统的可用性、可靠性和提升武器装备嵌入式系统的主动防御水平,提高航空武器装备系统的抗毁性有着重要的意义。     

A method for computing error vector magnitude in GSM EDGEsystems-simulation results

This paper describes the error vector magnitude (EVM) as it is specified for a GSM EDGE (8-PSK) system and presents a method of its derivation. Simulation results of the algorithm applied to a nonlinear power amplifier are shown, and compared to the data obtained with an alternative commercial implementation. The validity of the current EVM proposal as a system linearity figure of merit is also discussed     

LTE-Advanced的标准化情况

LTE-Advanced将在LTE的基础上研究新一代移动通信系统(IMT-Advanced)的候选技术提案,本文介绍了目前在3GPP中对LTE-Advanced标准化研究的情况,包括目前讨论的主要技术内容.     

BURST-LDA： A NEW TOPIC MODEL FOR DETECTING BURSTY TOPICS FROM STREAM TEXT

Topic models such as Latent Dirichlet Allocation （LDA） have been successfully applied to many text mining tasks for extracting topics embedded in corpora. However, existing topic models generally cannot discover bursty topics that experience a sudden increase during a period of time. In this paper, we propose a new topic model named Burst-LDA, which simultaneously discovers topics and reveals their burstiness through explicitly modeling each topic＇s burst states with a first order Markov chain and using the chain to generate the topic proportion of documents in a Logistic Normal fashion. A Gibbs sampling algorithm is developed for the posterior inference of the proposed model. Experimental results on a news data set show our model can efficiently discover bursty topics, outperforming the state-of-the-art method.     

Image registration

In order to demonstrate the growth of the medical image registration field over the past decades, this paper presents the number of journal publications on this topic since 1988 until 2002. In a similar manner, trends in topics within the field of medical image registration are detected. Publications on computed tomography (CT) and magnetic resonance imaging (MRI) are rather constant through the years. Positron emission tomography (PET) and single photon emission computed tomography (SPECT), on the other hand, seem to loose ground to newly emerging functional imaging techniques, such as functional MRI (fMRI) whereas an increase in interest in registration of ultrasound (US) images was observed. Two topics in image registration that are currently considered hot are intraoperative and elastic registration. Although the interest in intraoperative registration strongly increased in the late 1990s, there seems to be a slight relative decrease in recent years. On the other hand, elastic registration has become a popular topic, reaching the highest numbers so far in 2002.     

Antennas for non-specialists

The article reports the experience of giving a hands-on antenna course to a group of participants who were not antenna specialists. The discussion of the results is presented in the format of a student-instructor dialog. The questions asked by the participants were sometimes very challenging to answer, especially without resorting to mathematical formulas. For the benefit of those antenna instructors who are interested in imitating this course, a set of instructions for performing the experiments is presented at the beginning of each experiment; these can be used as worksheets to hand out to the participants.     

基于VPX的多DSP+FPGA红外图像处理系统设计与实现

针对大面阵红外图像快速处理要求及模块化设计原则,本文采用了4片TI公司的DSP和1片Virtex7 FPGA设计了一个多DSP的红外图像实时处理系统,试验表明该系统适用于复杂图像处理算法的计算和实时图像中跟踪目标的实时处理.