基于句式结构的评论倾向性识别方法

网络评论的倾向性识别是一种重要的网络舆情分析技术。针对网络评论的特点,提出了基于句式结构的网络评论倾向性识别方法。该识别方法主要思想是先对已进行倾向性识别的网络评论集进行分词并提取句式结构,形成各种句式结构的基准句集;再对待判别的网络评论提取句式结构,并比较其与相应句式结构的基准句集的相似度,从而判别出待识别的评论的褒贬倾向性。实验表明：该方法的准确率为80%以上,具有良好的实用性。     

Unifying regularization and Bayesian estimation methods for enhanced imaging with remotely sensed Data-part II: implementation and performance issues

The fused Bayesian-regularization (FBR) method from a companion paper provides a rigorous theoretical formalism for optimal estimation of the power spatial spectrum pattern (SSP) of the wave field scattered from the probing surface as it is required for enhanced radar imaging of the remotely sensed scenes. Being nonlinear and solution-dependent, the optimal FBR method requires extremely complex nonlinear solution-dependent operator inversions and, therefore, cannot be recommended as a numerically realizable estimator of the SSP. Here, we design a family of robust easy-to-implement FBR algorithms, provide the relevant computational recipes, and discuss their performances. We comment on the practical aspects of the robustified FBR estimators, such as numerical implementation and improvement in the output SNR. The advantage in using the proposed robust FBR method is demonstrated through simulations of enhancing the SAR images formed using the conventional matched filtering of the trajectory signal.     

Comments on `Efficient transdermal links with coupling-insensitivegain'' by B.C. Galbreath, et al

In a comment on a previously published paper (ibid., vol.BME-34, no.4, p.265-75, 1987), the potential benefits of stagger tuning of the coils on inductively-coupled links are discussed     

Fab Performance

To remain competitive and to boost profitability, manufacturers in capital-intensive and highly competitive industries want to maximize throughput and minimize flow time. Achieving high throughput conflicts with achieving low flow time. In order to unhide the tradeoff between throughput and flow time, a performance measure, called manufacturing performance, has been developed. The manufacturing performance is defined by the quotient of the ratio between throughput and flow time of an actual manufacturing system and this ratio of a reference system. The reference system can be adapted by the user in correspondence with objectives. By applying the manufacturing performance to one workstation and using analytic approximations for this workstation, manufacturing performance can be expressed analytically. It seems that manufacturing performance has an optimal value that is given by equipment availability and coefficient of variation. Manufacturing performance is applied also to a four-workstation manufacturing line. Results from analytic approximations show the practicability of the manufacturing performance. Comparison of manufacturing performance with overall fab efficiency, an earlier proposed metric, showed that the manufacturing performance is a more clear metric. This conclusion was based upon simulations with a two-stations manufacturing line. The manufacturing performance is a technical performance metric for manufacturing lines that supports, for instance, economical considerations to obtain optimal throughput-flow time combinations under economical optimal results. This is a useful addition to the existing metrics, which may benefit manufacturers in their operations. The authors consider this contribution as a discussion paper and demand for comment.     

Author's reply by S. Wang and F. L. Teixeira

Wang and Teixeira reply to a comment (by An Ping Zhao, IEEE Microwave Wireless Comp. Lett., vol.14, no.5, p. 248-9, 2004) on their original paper (Wang and Teixeira, IEEE Microwave Wireless Comp. Lett., vol.13, p.72-4, 2003 February).     

Comments on “Nondispersive waves: interpretation andcausality”, by P.T.M. Hillion [and reply]

Heyman and Felsen comment on a paper by Hillion (IEEE Trans. Antennas Propag., vol.AP-40, p.1031-5, 1992). Hillion gives a reply. The articles discuss nondiffracting wave objects and how they can be excited by physical aperture antennas     

Comments, with reply, on `Synchronization and relativity' by G.M.R.Winkler

The commenter asserts that the above-titled paper by G.M.R. Winkler (see ibid., vol.79, no.7, p.1029-39, July 1991) perpetuates a fairly widespread fundamental error by using a semipopular explanation for the dissemination of time in rotating frames of reference. The misconception that one must employ general relativity to describe kinematic phenomena (synchronization, Sagnac effect, etc.) in accelerated systems, even in flat space-time, is exposed by the commenter, who proposes a way to resolve the problem. Winkler replies that he shares the commenter's concerns but does not necessarily agree with the way he proposes to resolve the issues, and he presents arguments to support his position. In a further comment, the commenter disagrees and offers further discussion     

信息时代新闻评论工作者的职责与角色转型

随着信息技术的快速发展,各种媒介的信息量也呈几何增长.并引发了当今信息传播形态的深刻变革:人们接受信息的方式,由听命于一家之言到多元意见复合交流,及时反馈;传播关系发生了演变,媒介的一家独尊、传受分明的模式,转向以传为主、传受交互、受传合一的交流网络关系.同时,新闻评论的传播生态发生了变化,在仍然保留主流意见传播者的地位的同时,形式更为灵活,它成为一个议题设置者,开始搭建各种意见交流的平台.新闻评论出现了个性化、专业化的势态.这也要求新闻评论要遵循公共利益的原则,更加注重采用客观公正的表现方式,运用事实说话,而不是不加解释地直接发表结论.     

52 m散装水泥船罐体支撑结构局部强度分析与模糊评判

以52 m散装水泥船为研究对象, 利用有限元分析软件, 分析该船罐体支撑结构局部强度, 在局部强度不满 足规范要求的情况下, 对局部结构提出三种改进方案:改变支撑结构横向板的厚度、增加支撑板结构的垂直 扶强材和改变支撑结构板材属性。在通过计算验证应力计算值均满足规范要求的基础上, 借助模糊综合评 判理论对改进后三种方案进行比较分析, 通过确定评价对象的因素集、确定评价因素的权重向量、确定评 价对象的评语集、指标量化处理、二级模糊评判和一级模糊评判等流程, 确立方案Ⅲ为最优加强方案。     

融合深度情感分析和评分矩阵的推荐模型

目前,大多数推荐系统都具有评分数据稀疏性的问题,它会限制模型的有效性.而用户对于某件商品撰写的评论中隐含了很多信息,对评论文本进行情感分析并提取关键的因素来用于模型的学习,可以有效地缓解数据稀疏问题,但仅使用评论数据而忽略了评分数据的主要因素会影响推荐精度.对此,为了进一步提高推荐精度,该文提出一个评论文本和评分矩阵交...     

Comments on 'Basis-restricted transformations and performance measures for spectral representations' by Pearl, J.

In this correspondence, we comment on some of the shortcomings, for source encoding problems, of the measure of distance between orthonormal representations proposed by Pearl.^1We further examine, using rate-distortion theory, whether rates achievable for a given distortion level by the use of basis-restricted transformations have some inherent dissimilarity independently of input statistics and of other implied parameters.     

Comments on “SITO electronically tunable high output impedance current-mode universal filter”

A comment related to the recently published current-mode universal filter, is given. In this comment, it is claimed that this filter is derived from the previously published one without any significant change.     

Comments on “An exact formulation for the vector potential ofa cylindrical antenna with uniformly distributed current and arbitraryradius” [and reply]

The paper written by Werner (see ibid, vol.41, no.8, p.1009-1018, 1993) relies on the technique and results that were developed by Overfelt (1987). At the time, I submitted a comment regarding that method (see. Gera, ibid. p.584, 1990). It seems that this comment applies here. Werner replies that the exact expressions for the generalised exponential integral are mathematically correct in the form that they appear in the paper, as demonstrated by the results shown. There are actually several equivalent forms which exist for these expansions     

Cross-layer designs of multichannel reservation MAC under Rayleigh fading

We consider a reservation-based medium access control (MAC) scheme where users reserve data channels through a slotted-ALOHA procedure. The base station grants access to users in a Rayleigh fading environment using measurements at the physical layer and system information at the MAC layer. The paper has two contributions pertaining to simple reservation based medium access. First, we provide a Markov chain formulation to analyze the performance (throughput/channel utilization) of the multichannel slotted system. Second, a Neyman-Pearson like MAC design optimized for performance is presented. This design can serve as a benchmark in evaluating the performance of other designs based on conventional physical layer detectors such as maximum a posteriori probability, maximum likelihood, and uniformly most powerful detectors. Results show that utilizing system information in addition to the physical layer measurements indeed leads to a gain in performance. We discuss the issue of further improving the performance in fading by means of multiple measurements and also comment on the delay/channel-utilization trade-off for the optimal MAC design.     

Generalized sampling: a variational approach .II. Applications

For pt.I see ibid., vol.50, no.8, p.1965-76 (2000). The variational reconstruction theory from a companion paper finds a solution consistent with some linear constraints and minimizing a quadratic plausibility criterion. It is suitable for treating vector and multidimensional signals. Here, we apply the theory to a generalized sampling system consisting of a multichannel filterbank followed by a nonuniform sampling. We provide ready-made formulas, which should permit application of the technique directly to problems at hand. We comment on the practical aspects of the method, such as numerical stability and speed. We show the reconstruction formula and apply it to several practical examples, including new variational formulation of derivative sampling, landmark warping, and tomographic reconstruction     

Optical heterodyne binary-DPSK systems: a review of analysis andperformance

We review the work on optical heterodyne binary-DPSK systems. In particular we show why the study of these systems has been so challenging and discuss the techniques which have been developed to analyse the standard DPSK receiver. Next we describe the methods used to develop and analyse improved receiver structures and comment on the impact of improved performance and lowered error rate floors. We discuss the work on suboptimal receivers and outline the current state of the search for a truly optimal receiver. This work include a considerable discussion of the modeling and analysis of laser phase noise since it is this noise which makes the study of coherent optical systems so complex. We describe the historical development of this work from early approximate techniques to the accurate approaches currently emerging in the literature. We also evaluate the contributions made and outline their strengths, weaknesses and areas of use     

An efficient approach to comment spam identification

This paper proposes a novel approach to comment spam identification based on content analysis. Three main features including the number of links, content repetitiveness, and text similarity are used for comment spam identification. In practice, content repetitiveness is determined by the length and frequency of the longest common substring. Furthermore, text similarity is calculated using vector space model. The precisions of preliminary experiments on comment spam identification con-ducted on Chinese and English are as high as 93% and 82% respectively. The results show the validity and language independency of this approach. Compared with conventional spam filtering approaches,our method requires no training, no rule sets and no link relationships. The proposed approach can also deal with new comments as well as existing comments.     

Comments on: “Reduction of peak-to-average power ratio ofOFDM system using a companding technique”

The authors comment on the work of Xianbin Wang, Tjhung, and and Ng (see ibid., vol.45, no.3, 1999). They add that Wang et al. present a very elegant analysis of the symbol error rate in a companded COFDM system. A comment that they make is that it seems that the noise power was constant, while the transmitted signal's power was increased as it was companded. It would in our opinion be more meaningful to compare the performance of the companded signal to that of an uncompanded signal of equal power     

Message from the Editor (Jul. 1955 [T-MTT])

The omission from this issue of our distinguished microwave personality is regrettable. This feature has evoked much favorable comment and it is planned to continue it in all regular issues. The October issue will present Professor Ernst Weber of the Polytechnic Institute of Brooklyn.     

Optimal excitation of multimode graded-index fibres in d.m.d. and d.m.a. measurements

A wave optics computational procedure to obtain optimally selective excitation in d.m.d. and d.m.a. measurements is presented. Good agreement with a Fourier optics approach is found. It is shown that for the optimal excitation of higher order mode groups (by increasing input beam offset) the beam spot size must be considerably reduced from that for the optimal excitation of the fundamental mode.