The relationship between the Laplace transform and Fourier transform

In this note, a relationship between the one-sided Laplace transform and the one-sided Fourier transform is discussed.     

The fast recursive computation of Tchebichef moment and its inverse transform based on Z-transform

The outputs of cascaded digital filters operating as accumulators are combined with a simplified Tchebichef polynomials to form Tchebichef moments (TMs). In this paper, we derive a simplified recurrence relationship to compute Tchebichef polynomials based on Z-transform properties. This paves the way for the implementation of second order digital filter to accelerate the computation of the Tchebichef polynomials. Then, some aspects of digital filter design for image reconstruction from TMs are addressed. The new proposed digital filter structure for reconstruction is based on the 2D convolution between the digital filter outputs used in the computation of the TMs and the impulse response of the proposed digital filter. They operate as difference operators and accordingly act on the transformed image moment sets to reconstruct the original image. Experimental results show that both the proposed algorithms to compute TMs and inverse Tchebichef moments (ITMs) perform better than existing methods in term of computation speed.     

The relationship between individual characteristics and experienced presence

People experience different levels of presence (e.g.  and ), and different levels of cybersickness (Sharples, Cobb, Moody, & Wilson, 2008) even though they are immersed in the same virtual environment setting. In the current study, we raised the question how differences in individual characteristics might relate to differences in sensed presence for a virtual environment related to public speaking. The individual characteristics included in the experiment were related to visual abilities, personality traits, cognitive styles, and demographic factors. We recruited 88 participants, who were first immersed in a non-stereoscopic neutral environment, and then in a public speaking world: once with stereoscopic rendering and once without stereoscopic rendering, in a counter-balanced order. The results showed that immersive tendency and monocular visual ability were significantly correlated with presence and these correlations were consistent among the three virtual environments. Immersive tendencies and its subscale “involvement” were also found to be significantly correlated with cybersickness in all three worlds. Screening people on these variables may help to recognize the users who are more likely to benefit from virtual reality applications and may help to reduce the number of dropouts during virtual reality exposure therapy.     

The relationship between culture and information privacy policy

Operating in a global market provides challenges for managers concerned with information privacy. This work builds on a branch of research that has evolved to examine the relationship between culture and attitudes to information privacy. Our approach is unique in that our dependent variable is a count variable designed to measure the rate of uptake of privacy laws. It is a departure from studying cultural variables at the individual level. We also identify the cultural impact of legislation at the national level. Previous models generally use a relatively crude division of legislative codes. By contrast, this work examines the impact of culture on baskets of privacy elements drawn from the EU directive. These attributes are candidates for codification in law, but are taken up at varying rates. A key originality and challenge of the work is the use of the GLOBE variables for culture. Results suggest that group collectivism, power distance, assertiveness and uncertainty avoidance are the most powerful cultural predictors of the level of privacy legislation provision.     

Efficient implementation of the image rotation method using chirp Z-transform

The implementation of an image rotation method based on the chirp Z-transform is presented. Low computational costs of the algorithm are achieved by performing the chirp Z-transform using convolution in the Fourier domain. The series of numerical experiments supports the preservation of the image quality, even for multiple rotations.     

The relationship between organizational culture and the deployment of agile methods

Context

Systems development normally takes place in a specific organizational context, including organizational culture. Previous research has identified organizational culture as a factor that potentially affects the deployment systems development methods.

Objective

The purpose is to analyze the relationship between organizational culture and the post-adoption deployment of agile methods.

Method

This study is a theory development exercise. Based on the Competing Values Model of organizational culture, the paper proposes a number of hypotheses about the relationship between organizational culture and the deployment of agile methods.

Results

Inspired by the agile methods thirteen new hypotheses are introduced and discussed. They have interesting implications, when contrasted with ad hoc development and with traditional systems development methods.

Conclusion

Because of the conceptual richness of organizational culture and the ambiguity of the concept of agility the relationship between organizational culture and the deployment of agile systems development forms a rich and interesting research topic. Recognizing that the Competing Values Model represents just one view of organizational culture, the paper introduces a number of alternative conceptions and identifies several interesting paths for future research into the relationship between organizational culture and agile methods deployment.     

氢键与蛋白质耐热性关系的研究

挑选了NCBI COG数据库中具有全基因组的单细胞微生物,选择其中已知三维结构的蛋白质作为研究对象,通过HB- Plus3．0计算出氢键数目并用Perl编程将氢键分类,研究了不同类型的氢键对蛋白质耐热性的影响。结果表明:随着耐热性增高,古细菌类蛋白质中氢键总含量、主链-主链氢键含量,以及非电荷-非电荷氢键含量有显著降低;细菌类蛋白质带电荷-带电荷氢键含量显著增加,而非电荷-非电荷氢键含量显著降低。它们唯一的共同点都是避免在耐热蛋白质中形成非电荷-非电荷氢键。     

The relationship between monochronicity,polychronicity and individual characteristics

With the increasing complexity of control rooms and the information explosion, effective multitasking is now desired. Monochronicity and polychronicity, which describe a person's ability to do one thing and many things at a time, respectively, have been studied for a long time. However, it is not clear these abilities are related to various individual characteristics. Forty-eight Chinese participants were tested on their perception, memory, judgement, attention ability and cognitive style. They also performed a task that required search and calculation under three conditions of unpaced, paced and paced with sequencing. There were significant differences in the performance and strategy between monochronic and polychronic individuals in the selective attention test. Monochronic individuals focused their attention on the primary task and achieved higher performance. Polychronic individuals had somewhat better total performance in more than one task under time-constrained conditions. The results clearly indicate that an individual's time use behaviours ought to be considered in training and control scenarios to account for differences among people.     

The relationship between knowledge,belief, and certainty

We consider the relation between knowledge and certainty, where a fact isknown if it is true at all worlds an agent considers possible and iscertain if it holds with probability 1. We identify certainty with belief, interpreted probabilistically. We show that if we assume one fixed probability assignment, then the logic KD45, which has been identified as perhaps the most appropriate for belief, provides a complete axiomatization for reasoning about certainty. Just as an agent may believe a fact although is false, he may be certain that a fact is true although is false. However, it is easy to see that an agent can have such false (probabilistic) beliefs only at a set of worlds of probability 0. If we restrict attention to structures where all worlds have positive probability, then S5 provides a complete axiomatization. If we consider a more general setting, where there might be a different probability assignment at each world, then by placing appropriate conditions on thesupport of the probability function (the set of worlds which have non-zero probability), we can capture many other well-known modal logics, such as T and S4. Finally, we considerMiller's principle, a well-known principle relating higher-order probabilities to lower-order probabilities, and show that in a precise sense KD45 characterizes certainty in those structures satisfying Miller's principle.     

The relationship between coping strategies and GHQ-scores in nurses

This paper discusses the development of a situation specific questionnaire for measuring coping with shiftwork. Previously, no standardized measure appears to have been developed, even though coping behaviour is considered to be an important factor in determining tolerance to shiftwork. The results from this study indicated that the present questionnaire may have some potential. · Its psychometric qualities were relatively good. Coping scores were related to psychological health, measured by GHQ-12. Analysis of variance showed a main effect of only one of the subscales (disengagement strategies) on GHQ and also a reliable interaction between disengagement and engagement on GHQ-scores. Further research into the effect of coping strategies on shiftwork tolerance is suggested.     

The relationship between workflow graphs and free-choice workflow nets

Workflow graphs represent the main control-flow constructs of industrial process modeling languages such as BPMN, EPC and UML activity diagrams, whereas free-choice workflow nets are a well understood class of Petri nets that possesses many efficient analysis techniques. In this paper, we provide new results on the translation between workflow graphs and free-choice workflow nets.We distinguish workflow graphs with and without inclusive Or-logic. For workflow graphs without inclusive logic, we show that workflow graphs and free-choice workflow nets are essentially the same thing. More precisely, each workflow graph and each free-choice workflow net can be brought into an equivalent normal form such that the normal forms are, in some sense, isomorphic. This result gives rise to a translation from arbitrary free-choice workflow nets to workflow graphs.For workflow graphs with inclusive logic, we provide various techniques to replace inclusive Or-joins by subgraphs without inclusive logic, thus giving rise to translations from workflow graphs to free-choice nets. Additionally, we characterize the applicability of these replacements. Finally, we also display a simple workflow graph with an inclusive Or-join, which, in some sense, cannot be replaced. This shows a limitation of translating inclusive logic into free-choice nets and illustrates also a difficulty of translating inclusive logic into general Petri nets.     

On the relationship between models and ontologies

Software and Systems Modeling -     

竖立球冠体内任意高度与体积关系研究

对平置金属直圆筒罐两侧球冠内高度与体积关系进行了研究,得出了可供计算计量使用的关系式V2=f（H2）,给出了计算实例。     

The relationship between physical workload and quality within line-based assembly

Reducing costs and improvement of product quality are considered important to ensure productivity within a company. Quality deviations during production processes and ergonomics have previously shown to be associated. This study explored the relationship between physical workload and real (found during production processes) and potential (need of extra time and assistance to complete tasks) quality deviations in a line-based assembly plant. The physical workload on and the work rotation between 52 workstations were assessed. As the outcome, real and potential quality deviations were studied during 10 weeks. Results show that workstations with higher physical workload had significantly more real deviations compared to lower workload stations. Static work posture had significantly more potential deviations. Rotation between high and low workload was related to fewer quality deviations compared to rotation between only high workload stations. In conclusion, physical ergonomics seems to be related to real and potential quality deviation within line-based assembly.

Practitioner Summary: To ensure good productivity in manufacturing industries, it is important to reduce costs and improve product quality. This study shows that high physical workload is associated with quality deviations and need of extra time and assistance to complete tasks within line-based assembly, which can be financially expensive for a company.     

The structural relationship between financial ratios and capital asset pricing

The relationship between financial statement information and security market information has been the subject of intensive theoretical and empirical research. The bulk of empirical studies consider this relationship without an explicit consideration of causality. In the present study we put forward some novel results concerning the direction of causality between these two information sets. Our results indicate that the accrual information in financial statements has some projective value with respect to future reactions on the security markets.     

The generalized matrix product and the wavelet transform

This paper provides a new formulation of wavelet transforms in terms of generalized matrix products. After defining the generalized matrix product, a fast algorithm using parallelism for compactly supported wavelet transforms that satisfym-scale scaling equations form 2 is established. Several special examples, such as the Fourier-wavelet matrix expansion and wavelet decompositions and reconstructions, that demonstrate that the new formulation and algorithm offer unique advantages over existing wavelet algorithms are provided.This research was supported in part by U.S. Air Force contract F08635-89-C-0134.