Service substitution is an important research topic in the fields of Web services and service-oriented computing. This work presents a novel method to analyse and substitute Web services. A new concept, called a Service Cluster Net Unit, is proposed based on Web service clusters. A service cluster is converted into a Service Cluster Net Unit. Then it is used to analyse whether the services in the cluster can satisfy some service requests. Meanwhile, the substitution methods of an atomic service and a composite service are proposed. The correctness of the proposed method is proved, and the effectiveness is shown and compared with the state-of-the-art method via an experiment. It can be readily applied to e-commerce service substitution to meet the business automation needs.

A Web service substitution method based on service cluster nets

Psychological resilience is characterized as the ability to recover from stress, which is essential for sleep quality. However, the neurological underpinnings of psychological resilience and the neural substrates of the links between psychological resilience and sleep quality in healthy brains remain not well understood. To address these issues, we adopted the method of resting-state functional connectivity (rs-FC) analysis in 144 young college students. The functional connectivity analysis indicated that psychological resilience was associated with the middle frontal gryus (MFG) functional connectivity, which mainly involved the right middle cingulum gyrus (rMCG), the right precentral gyrus (rPreCG), the left postcentral gyrus (lPoCG), and the left thalamus. Furthermore, mediation analysis suggested that psychological resilience played a mediating role in the relationship between MFG functional connectivity and sleep quality. Overall, the current study offered further evidence for the neurological underpinnings of psychological resilience and provided new insights into the relationship between psychological resilience and sleep quality from a neural basis perspective. 

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Psychological resilience mediates the association of the middle frontal gyrus functional connectivity with sleep quality

The composition of web services in cloud computing allows making them cooperative in order to satisfy a client request. However, the substitution of one of these services by another must ensure the proper functioning of the new composition. Hence there is a need to develop adequate methods to verify the services substitution. In this aim, we propose, in the present paper, two verification methods. The first one deals with context-independent substitution and sets if a web service can substitute another one. The second one focuses on context-aware substitution and decides the substitutability of web services in a specific composition. These methods use open coloured Petri net (OCNets) as a formal framework for modelling web services and their composition in cloud computing. This model allows the structural analysis of web services' interfaces. For the behavioural verification, we use services automata, which allow capturing OCNets' behaviour and checking its preservation.

On context-independent and context-aware cloud services substitutability verification

Web services are evolved as a platform independent technology allowing universal interoperability between software assets. Web services substitution is one of the most challenging topics in service computing area. In this paper, we investigate a context independent substitutability of Web services. We use open colored Petri nets (OCNets) as a formal modeling framework of services and we propose an approach for verifying the substitutability using some reduction rules of OCNets.

Verifying Web services substitutability using open colored nets reduction techniques

Web services are considered as one of the emerging technologies in the development, deployment and integration of Internet applications, and this, thanks to their features of universal interoperability and their ability to be reused and composed with other web services. Their substitution is one of the most challenging topics in service computing area. In this paper, we investigate a context-independent substitutability of Web services. We use Open Colored Petri Nets (OCNets) as a formal modeling framework of web services and we propose an approach for verifying the substitutability which proceeds in two steps. First, we compare the structures of OCNets' interfaces while deducting the type of the relation between them. After that, we generate the services automata of the OCNets, and we compare their behaviors by using the algorithm WS Behavioral Substitutability Checking.

Towards formal checking of Web services substitutability

Web service substitution refers to the problem of identifying an optimal service that can replace another service for the same abstract service in a composition. However, the quality of Web services is closely related to their execution context. For example, a Web service will have different performance if it is invoked in different network conditions, transferring and processing different data amount, or in different service host conditions. Most existing service substitution approaches ignore this issue so as to make the substituted composite service inefficient or even unexecutable. To solve this problem, an execution context aware approach for Web service substitution is proposed in this paper. Firstly the execution context data of composite services is recorded into log repositories. Then, the Web service execution context feature rules which qualitatively express the different performance of Web services in different execution context conditions are mined. At last, the discovered knowledge is applied to choose the optimal candidate substitutive service according to current execution context conditions. Extensive experimental results show that our approach can improve the robustness and efficiency of substituted composite services.

http://ieeexplore.ieee.org/iel5/6214738/6222119/06222149.pdf

An execution context aware approach for Web service substitution

Previous neuroimaging studies have demonstrated that sleep is associated with brain functional changes in some specific brain regions. However, few studies have examined the relationship between all possible functional connectivities (FCs) within the sensory/somatomotor network (SSN) and the sleep quality of young male samples. The SSN consists of two motor cortices and is known to play a critical role in sleep. Poor sleep quality may be associated with increased sensory/somatomotor functional connectivity during rest. Hence, 202 young male participants underwent a resting-state functional magnetic resonance imaging (fMRI) scan and completed the Pittsburgh Sleep Quality Index (PSQI). Results indicated that increased functional connectivity within the SSN was associated with poor sleep quality. Specifically, the total PSQI score was positively correlated with the increased functional connectivity of the left paracentral lobule (PCL), bilateral precentral gyrus (PreCG), supplementary motor area (SMA) and bilateral postcentral gyrus (PoCG). Additionally, our findings also exhibited that (a) the subjective sleep quality factor of PSQI was positively correlated with FC between the bilateral PoCG and the bilateral PCL as well as between the left PreCG and the right SMA; (b) the sleep latency factor of PSQI was positively correlated with FC between the left PoCG and the right precuneus (PCUN); (c) the sleep disturbances factor of PSQI was positively correlated with FC between the left PCL and the right PoCG, and (d) the daytime dysfunction factor of PSQI was positively correlated with FC between the bilateral PoCG and the left PCL as well as between the bilateral PreCG and the SMA. In short, our findings can be comprehensively understood as neural mechanisms of intrinsic SSN connectivity are associated with sleep quality of man. Meanwhile, it may expand our knowledge and provide new insight into a deeper understanding of the neurobiological mechanisms of sleep or sleep problems. 

/pdf/resting-state-functional-connectivity-of-the-sensory-20ixiq6v.pdf

Resting-state functional connectivity of the sensory/somatomotor network associated with sleep quality: evidence from 202 young male samples

The role of valence, arousal, stimulus type, and temporal paradigm in the effect of emotion on time perception: A meta-analysis

The impact of peer victimization on Chinese left-behind adolescent suicidal ideation: The mediating role of psychological suzhi and the moderating role of family cohesion.

Dan Cheng Li

Papers

An execution context aware approach for Web service substitution

Resting-state functional connectivity of the sensory/somatomotor network associated with sleep quality: evidence from 202 young male samples

The role of valence, arousal, stimulus type, and temporal paradigm in the effect of emotion on time perception: A meta-analysis

The impact of peer victimization on Chinese left-behind adolescent suicidal ideation: The mediating role of psychological suzhi and the moderating role of family cohesion.

The Relationship Between Parenting Stress and Parental Burnout Among Chinese Parents of Children with ASD: A Moderated Mediation Model.