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Existence results for a class of semi-linear evolution equations
Eduardo Hernandez M.
Electronic Journal of Differential Equations , 2001,
Abstract: We prove the existence of regular solutions for the quasi-linear evolution $$ {d over dt}(x(t)+g(t,x(t))=Ax(t)+f(t,x(t)), $$ where $A$ is the infinitesimal generator of an analytic semigroup of bounded linear operators defined on a Banach space and the functions $f, g$ are continuous.
More General Credibility Models  [PDF]
Virginia ATANASIU
Informatica Economica Journal , 2007,
Abstract: This communication gives some extensions of the original Bühlmann model. The paper is devoted to semi-linear credibility, where one examines functions of the random variables representing claim amounts, rather than the claim amounts themselves.
Credibility in Web Search Engines  [PDF]
Dirk Lewandowski
Computer Science , 2012,
Abstract: Web search engines apply a variety of ranking signals to achieve user satisfaction, i.e., results pages that provide the best-possible results to the user. While these ranking signals implicitly consider credibility (e.g., by measuring popularity), explicit measures of credibility are not applied. In this chapter, credibility in Web search engines is discussed in a broad context: credibility as a measure for including documents in a search engine's index, credibility as a ranking signal, credibility in the context of universal search results, and the possibility of using credibility as an explicit measure for ranking purposes. It is found that while search engines-at least to a certain extent-show credible results to their users, there is no fully integrated credibility framework for Web search engines.
Media credibility and cognitive authority. The case of seeking orienting information
Reijo Savolainen
Information Research: an international electronic journal , 2007,
Abstract: Introduction. This article results from a qualitative case study focusing on the information seeking practices of environmental activists. The main attention was devoted to their perceptions of media credibility and cognitive authority in the context of seeking orienting information about environmental issues in particular. Method. The empirical data were gathered in 2005 by semi-structured interviews with twenty environmental activists in Finland. Analysis. The interview data were examined by means of qualitative content analysis by constantly comparing the articulations of media credibility and cognitive authority. Results. The perceptions of media credibility and cognitive authority tend to be dependent on the topic at hand. No specific cognitive authorities were recognized. Sources providing focused information issued by environmental asssociations were perceived as most credible. Newspapers were perceived as less credible due to their political bias and the general level of news reporting. The significance of one's own critical reflection was emphasized in the judgement of the credibility of information sources of various types. Conclusion. Perceived media credibility and cognitive authority significantly, though often implicitly, orient the selection of information sources. There is a need also to explore their role in the context of seeking problem-specific information, both job-related and non-work.
A non-linear model of information seeking behaviour
Allen E. Foster
Information Research: an international electronic journal , 2005,
Abstract: The results of a qualitative, naturalistic, study of information seeking behaviour are reported in this paper. The study applied the methods recommended by Lincoln and Guba for maximising credibility, transferability, dependability, and confirmability in data collection and analysis. Sampling combined purposive and snowball methods, and led to a final sample of 45 inter-disciplinary researchers from the University of Sheffield. In-depth semi-structured interviews were used to elicit detailed examples of information seeking. Coding of interview transcripts took place in multiple iterations over time and used Atlas-ti software to support the process. The results of the study are represented in a non-linear Model of Information Seeking Behaviour. The model describes three core processes (Opening, Orientation, and Consolidation) and three levels of contextual interaction (Internal Context, External Context, and Cognitive Approach), each composed of several individual activities and attributes. The interactivity and shifts described by the model show information seeking to be non-linear, dynamic, holistic, and flowing. The paper concludes by describing the whole model of behaviours as analogous to an artist's palette, in which activities remain available throughout information seeking. A summary of key implications of the model and directions for further research are included.
Admissible semi-linear representations  [PDF]
M. Rovinsky
Mathematics , 2005,
Abstract: The category of admissible (in the appropriately modified sense of representation theory of totally disconnected groups) semi-linear representations of the automorphism group of an algebraically closed extension of infinite transcendence degree of the field of algebraic complex numbers is described.
Low regularity semi-linear wave equations  [PDF]
Terence Tao
Mathematics , 1997,
Abstract: We prove local well-posedness results for the semi-linear wave equation for data in $H^\gamma$, $0 < \gamma < \frac{n-3}{2(n-1)}$, extending the previously known results for this problem. The improvement comes from an introduction of a two-scale Lebesgue space $X^{r,p}_k$.
基于回归特征分析的BPSK信号盲处理结果可信性评估
Credibility Evaluation for Blind Processing Results of BPSK Signals by Using Regression Features
 [PDF]

胡晓燕,胡国兵,高燕,吴珊珊
- , 2015,
Abstract: 针对二相编码(Binary phase shift k eying,BPSK)信号盲处理过程中信号调制方式识别及参数估计的可信性评估问题,提出了一种 基于线性回归特征分析的处理方法。根据特定处理结果建立参考信号,并将参考信号与原始 观测信号进行相关累加取模值,在分析相关累加模值曲线在原序与升序两种不同情形下线性回归 差异的基础上,分别定义了排序回归系数及分段回归符号两大特征,用以判别BPSK信号盲处 理结果的可信性。计算机仿真结果表明,在低信噪比、缺乏信号先验信息的条件下,本算法 可对BPSK信号盲处理结果的可信性进行有效检验。
A credibility test method based on the featu res of the linear regression is proposed to evaluate the blind processing result s of binary phase shift keying (BPSK) signals such as the modulation recognitio n and parameter estimation. The reference signals are first constructed depending on the certain identified modulation results. Two features, the ordered re gression factor and sign of the segments regression, are defined to test the cr edibility of the processing results by analyzing the differences of linear reg ression characteristics of the correlation series modulus between the ori ginal and the ascending order. Simulation results show that the proposed method can be used to effectively verify the credibility for blind processing results o f BPSK signals both at low signal to noise ratio and the condition without a prior knowledge for signal parameters.
Linear Programming in the Semi-streaming Model with Application to the Maximum Matching Problem  [PDF]
Kook Jin Ahn,Sudipto Guha
Computer Science , 2011,
Abstract: In this paper, we study linear programming based approaches to the maximum matching problem in the semi-streaming model. The semi-streaming model has gained attention as a model for processing massive graphs as the importance of such graphs has increased. This is a model where edges are streamed-in in an adversarial order and we are allowed a space proportional to the number of vertices in a graph. In recent years, there has been several new results in this semi-streaming model. However broad techniques such as linear programming have not been adapted to this model. We present several techniques to adapt and optimize linear programming based approaches in the semi-streaming model with an application to the maximum matching problem. As a consequence, we improve (almost) all previous results on this problem, and also prove new results on interesting variants.
Integrability Conditions for SDEs and Semi-Linear SPDEs  [PDF]
Feng-Yu Wang
Mathematics , 2015,
Abstract: By using the local dimension-free Harnack inequality established on incomplete Riemannian manifolds, integrability conditions on the coefficients are presented for SDEs to imply the non-explosion of solutions as well as the existence, uniqueness and regularity estimates of invariant probability measures. These conditions include a class of drifts unbounded on compact domains such that the usual Lyapunov conditions can not be verified. The main results are extended to second order differential operators on Hilbert spaces and semi-linear SPDEs.
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