Penn State College of Communications

About: Penn State College of Communications is a based out in . It is known for research contribution in the topics: Relay & Cognitive radio. The organization has 2106 authors who have published 2119 publications receiving 24693 citations.

Byzantine Defense in Collaborative Spectrum Sensing via Bayesian Learning

Abstract: Collaborative spectrum sensing (CSS) enables secondary users in cognitive radio networks to collaboratively explore spectrum holes as well as protecting the primary user from being interfered. Unfortunately, the emergence of spectrum sensing data falsification (SSDF) attack, also known as the Byzantine attack, brings significant threat to the reliability of the CSS. Majority of the existing studies on Byzantine defense can be divided into two categories: one is directly to make the judgment based on the current spectrum sensing data, while the other uses the historical spectrum sensing data to update sensors’ reputation. The first category of studies does not take the historical spectrum sensing data into account, while most of the second category of studies are heuristic in nature. In this paper, we invoke Bayesian learning to design Byzantine defense schemes. First, we develop a Bayesian offline learning algorithm by considering one practical challenge that the ground-truth spectrum state is unavailable for training. Then, we develop a Bayesian online learning algorithm by considering the case that the sensors’ attribute may be time-varying. In addition, we present simulations to show the performance of the proposed defence algorithms.

The role of negative emotions on motivation and communicative action: Testing the validity of situational theory of problem solving in the context of South Korea

Abstract: The purposes of this study are to explore the role of negative emotions in the framework of the situational theory of problem solving (STOPS). First, we tested the validity of the original STOPS model with a sex crime issue in the context of Korea. Second, we tested the mediating role of negative emotions in the relationship between situational recognition and communicative action. The result suggests that STOPS is a useful model with a crime problem in the Korean context. Also, our proposed model shows that negative emotions serve as another aspect of motivation, and emotional experiences might precede subsequent cognitive activities. Especially, negative emotions show a stronger effect on situational motivation than communicative action. This study also found that negative emotions people feel about sex crimes directly influence their communicative action. Among different types of publics, the active and aware publics show stronger emotional responses than do the latent publics and nonpublics.

Compact circular polarised SIW array antenna with high gain and conical-beam

Abstract: A substrate integrated waveguide (SIW) cavity-backed slot array antenna with circularly polarised (CP) conical beam is proposed. The antenna consists of four SIW cavities and four annular ring slots on each cavity as radiating part. Each antenna element radiates CP boresight beam and then conical beam can be obtained for the whole array. Without individual feed network, the proposed antenna has compact structure.