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Ullah R.,KAIST | Amblee N.,Indian Institute of Management Kozhikode | Kim W.,KAIST | Lee H.,Kakao Data Mining and Consulting Company
Decision Support Systems | Year: 2016

Word-of-mouth (WOM) in the form of online customer reviews has received considerable attention by practitioners and academics. Prior literature has focused more on the understanding of the phenomenon using the frequency or overall rating/valence information of WOM, while questions on how firms can potentially use or design online WOM platforms and benefit from it based on the content of WOM are still open, and need more attention from researchers. In addition, an important antecedent for the generation of word-of-mouth is a strong emotional imbalance known as schema discrepancy, which is considered to trigger the consumer to post a customer review online. However, only a limited number of studies to date have actually examined the emotional content of reviews to validate this line of reasoning. To fill this gap, we analyzed the emotional content of a large number of online product reviews using Natural Language Processing (NLP) methods. We find that there is a difference in the emotional content of reviews across search and experience goods in the early stages of product launch. However, interestingly, these differences disappear over time as the addition of reviews reduces the information asymmetry gap. This suggests that traditional experience goods are evaluated more like search goods in online environments, because consumers can easily evaluate attributes of products prior to purchase based on the reviews accumulated. In addition, we find that more extreme reviews have a greater proportion of emotional content than less extreme reviews, revealing a bimodal distribution of emotional content, thereby empirically validating a key assumption that underpins much of the extant literature on online WOM. Furthermore, reviews have a greater proportion of positive emotional content within positive extreme ratings as compared to negative emotional content within negative extreme ratings which is a major factor in online WOM generation, and helps explain the commonly observed J-shaped distribution of reviews. Our findings suggest important managerial implications regarding product development, advertisement, and platform design using WOM content. © 2015 Elsevier B.V. All rights reserved. Source

Sidharth S.,Center for Artificial Intelligence and Robotics | Sebastian M.P.,Indian Institute of Management Kozhikode
ACE 2010 - 2010 International Conference on Advances in Computer Engineering | Year: 2010

The WiMAX IEEE 802.16 (e) is defined as the Worldwide Interoperability for Microwave Access by the WiMAX Forum, formed in April 2001 to promote conformance and interoperability of the IEEE 802.16 standard, officially known as WirelessMAN. The absence of physical boundaries makes in general a wireless network more vulnerable than a wired network. The IEEE 802.16 provides a security sublayer in the MAC layer to address the privacy issues across the fixed BWA (Broadband Wireless Access). Several proposals have been published to address the flaws in IEEE802.16 security after the release of IEEE802.16-2001. However, even with the modified version IEEE802.16-2004, the security problems still persist and many additional flaws have emerged. This paper examines the threats against the authentication protocols of WiMAX and proposes a new authentication protocol which is more reliable and secure. The proposed protocol is rigid against the attacks like Denial of service (DOS), Man-in-the-middle and replay. © 2010 IEEE. Source

Roy S.,Indian Institute of Management Kozhikode | Mukhopadhyay C.,Indian Institute of Science
Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability | Year: 2015

This article presents frequentist inference of accelerated life test data of series systems with independent log-normal component lifetimes. The means of the component log-lifetimes are assumed to depend on the stress variables through a linear stress translation function that can accommodate the standard stress translation functions in the literature. An expectation-maximization algorithm is developed to obtain the maximum likelihood estimates of model parameters. The maximum likelihood estimates are then further refined by bootstrap, which is also used to infer about the component and system reliability metrics at usage stresses. The developed methodology is illustrated by analyzing a real as well as a simulated dataset. A simulation study is also carried out to judge the effectiveness of the bootstrap. It is found that in this model, application of bootstrap results in significant improvement over the simple maximum likelihood estimates. © IMechE 2015. Source

Thangamani G.,Indian Institute of Management Kozhikode
International Journal of Performability Engineering | Year: 2013

This paper deals with the availability analysis of a Cooling Tower used in an air conditioning system. The system is modeled as a Generalized Stochastic Petri Net (GSPN) and analyzed using Monte Carlo Simulation method. The superiority of this approach over others is demonstrated. The proposed GSPN is a promising tool that can be conveniently used to model and analyze any complex systems. It is a promising tool for modeling and estimation of reliability measures of any process plants. © RAMS Consultants. Source

Balooni K.,Indian Institute of Management Kozhikode | Balooni K.,Wageningen University | Lund J.F.,Copenhagen University
Conservation Letters | Year: 2014

One of the proposed strategies for implementation of reducing emissions from deforestation and forest degradation plus (REDD+) is to incentivize conservation of forests managed by communities under decentralized forest management. Yet, we argue that this is a challenging road to REDD+ because of three general characteristics of forests under existing decentralized management regimes. First, these forests already accumulate biomass and, in some cases, generate leakage, which threatens to undercut REDD+ additionality. Second, these forests are many and small, which will drive up REDD+ transactions costs. Third, beyond the "conservation islands" represented by forests under decentralized management, processes of deforestation and forest degradation continue. Given these challenges, we argue that REDD+ efforts through decentralized forestry should be redirected from incentivizing further conservation of forests under existing decentralized management arrangements toward a push for extending the coverage of forests under decentralized management, making forest rights the hard currency of REDD+. © 2013 Wiley Periodicals, Inc. Source

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