{"title":"Developing Models of the Control and Monitoring System of SMS-Network Platforms","authors":"T. Musina","doi":"10.2139/ssrn.3126154","DOIUrl":"https://doi.org/10.2139/ssrn.3126154","url":null,"abstract":"This paper is concerned with analytical models and methods for reliability planning, optimization, and operation of the control and monitoring system of SMS-network platforms. The difference between classical models of reliability and models developed here is that the last ones take into account the economy is often an important aspect of reliability planning. Network providers operate in a competitive environment, so the main principle of reliability planning is not so much to increase reliability as well (as it’s done in fully technical approach) as to maximise the total profit of the network. Thus, new methods must allow to find the combination of factors (costs, investments into reliability, redundancy and increased maintenance, the profit from system operation, penalties for delays and failures, risks defined in a service level agreement, etc.) that maximises the profit. We employ the well-known from an actuarial science a model that considers a network through two cash flows: incoming cash from customers and outgoing claims paid due unreliability under SLA. Also we include into the optimisation model more general assumptions about the reliability of systems: different ways of reliability improvements and redundancy, non-exponentially distributed failures and recoveries, dependent failures, and reliability control.","PeriodicalId":325692,"journal":{"name":"RCRN: Communication Networks (Topic)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122042034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Diffusion of Academic Achievements: Social Selection and Influence in Student Networks","authors":"S. Dokuka, D. Valeeva, M. Yudkevich","doi":"10.2139/ssrn.2658031","DOIUrl":"https://doi.org/10.2139/ssrn.2658031","url":null,"abstract":"Peer group effects show the influence of student social environments on their individual achievements. Traditionally, a social environment is considered by researchers of peer effects as exogenously given. However, significant peers that affect performance are often those that are deliberately chosen. Students might choose their friends among peers with similar academic achievements. A dynamic analysis of student social networks and academic achievements is needed to disentangle social selection and social influence processes in network formation. Using data about the friendship and advice networks of first year undergraduate students, we show that friends tend to assimilate each others’ achievements and choose advisers with similar grades. We explain these results by social segregation based on student performance. The article contributes to the dynamic analysis of student social networks and the understanding of the nature of peer group effects in education","PeriodicalId":325692,"journal":{"name":"RCRN: Communication Networks (Topic)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122492864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Firm-Created Word-of-Mouth Communication: A Field-Based Quasi-Experiment","authors":"D. Godes, Dina Mayzlin","doi":"10.2139/ssrn.569361","DOIUrl":"https://doi.org/10.2139/ssrn.569361","url":null,"abstract":"In this paper, we investigate the effectiveness of the firm's proactive management of consumer-to-consumer communication. We are particularly interested in understanding how, if at all, the firm should go about effecting meaningful word-of-mouth. To tackle this problem, we implemented a large-scale field-based quasi experiment in which a national firm created word of mouth through two (non-randomized) populations: loyal customers and non-loyal customers. We break our theoretical problem into two subproblems. First, we ask, What kind of WOM drives sales? Motivated by previous research, we hypothesize that the WOM that is most effective at driving sales occurs between acquaintances (not friends) and is created by non-loyal customers, not loyals. We find support for this. This result is also noteworthy as it demonstrates the potential usefulness of exogenously created WOM. Then, we ask, \"Which agents are most effective at creating this kind of WOM?\" In particular, we are interested in evaluating the effectiveness of the commonly-used opinion leader designation. While we find that for the agents that were very loyal to the product, opinion leadership was associated with the creation of more WOM, this was not the case for less loyal agents. This finding may present a challenge for a firm attempting to design a WOM campaign. In a final exploratory analysis, we suggest a measure of one's social network intensity as a predictor of effectiveness of non-loyals as potential buzz agents.","PeriodicalId":325692,"journal":{"name":"RCRN: Communication Networks (Topic)","volume":"253 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120968583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}