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유요한 ( Yoo¸ Yohan ) 한국종교학연구회 2021 宗敎學硏究 Vol.39 No.-
Just as articulated as National Intangible Heritage by Cultural Heritage Administration of Korea in the designation announcement of Jeju keun-gut, the Jeju traditional shamanic religion can be said to be “living” and is very valuable as systematic academic materials. Many Jeju people still outline the principle of their lives on the basis of traditional myths and reenact the myths in carrying out rituals at each stage of their lives, at both the level of community and that of family. Jeju myths provide people an overall worldview that covers perspectives of human beings, souls, nature, gods, and cosmos. Jeju myths not only demonstrate the characteristics of Korean shamanism, more specifically, those of Jeju shamanic tradition, but also help students attain better understandings of myth itself. Likewise, Jeju rituals, including keun-gut, are useful materials for comprehending general properties of ritual, while showing distinct aspects of the Jeju religion. Jeju rituals are also invaluable for studying the Korean shamanic tradition, in that they contain religious thoughts and practices that are now difficult to be seen in most places of Korea. Hereafter, more comprehensive and better organized research on the Jeju religion than now should be conducted.
Plastic Deformation Behavior of Sintered Fe-Based Alloys for Light-Weight Automotive Components
Yohan Kang,Suchul Yoon,Minwook Kim,Seok-Jae Lee 한국진공학회(ASCT) 2014 Applied Science and Convergence Technology Vol.23 No.3
We investigated the effects of the chemical composition and the relative density on the plastic deformation behavior of sintered Fe-based alloys by means of compressive tests. Overall compressive stresses increased as the amount of alloying elements and the relative density were respectively increased. Addition of alloying elements except for Mo increased the yield stress regardless of the relative density. The relationship between the effects of the chemical composition and the relative density and the mean rate of the stress increase was analyzed. A constitutive equation based on the Ludwik equation with the regressed parameters was proposed to predict the compressive true stress-true strain curves of the sintered Fe-based alloys. The K and n values used in the proposed equation were regressed as a function of the alloying elements and the relative density based on the individual K and n values. The plastic deformation behavior predicted using the proposed constitutive equation showed reliable accuracy compared with experimental data.
Autonomous Management of Everyday Places for a Personalized Location Provider
Yohan Chon,Talipov, E.,Hojung Cha IEEE 2012 IEEE Transactions on Human-Machine Systems Vol.42 No.4
<P>Currently available location technologies such as the global positioning system (GPS) or Wi-Fi fingerprinting are limited, respectively, to outdoor applications or require offline signal learning. In this paper, we present a smart phone-based autonomous construction and management of a personalized location provider in indoor and outdoor environments. Our system makes use of electronic compass and accelerometer, specifically for indoor user tracking. We mainly focus on providing point of interest (POI) locations with room-level accuracy in everyday life. We present a practical tracking model to handle noisy sensors and complicated human movements with unconstrained placement. We also employ a room-level fingerprint-based place-learning technique to generate logical location from the properties of pervasive Wi-Fi radio signals. The key concept is to track the physical location of a user by employing inertial sensors in the smartphone and to aggregate identical POIs by matching logical location. The proposed system does not require a priori signal training since each user incrementally constructs his/her own radio map into their daily lives. We implemented the system on Android phones and validated its practical usage in everyday life through real deployment. The extensive experimental results show that our system is indeed acceptable as a fundamental system for various mobile services on a smartphone.</P>
SmartDC: Mobility Prediction-Based Adaptive Duty Cycling for Everyday Location Monitoring
Yohan Chon,Talipov, Elmurod,Hyojeong Shin,Hojung Cha IEEE 2014 IEEE TRANSACTIONS ON MOBILE COMPUTING Vol.13 No.3
<P>Monitoring a user's mobility during daily life is an essential requirement in providing advanced mobile services. While extensive attempts have been made to monitor user mobility, previous work has rarely addressed issues with predictions of temporal behavior in real deployment. In this paper, we introduce SmartDC, a mobility prediction-based adaptive duty cycling scheme to provide contextual information about a user's mobility: time-resolved places and paths. Unlike previous approaches that focused on minimizing energy consumption for tracking raw coordinates, we propose efficient techniques to maximize the accuracy of monitoring meaningful places with a given energy constraint. SmartDC comprises unsupervised mobility learner, mobility predictor, and Markov decision process-based adaptive duty cycling. SmartDC estimates the regularity of individual mobility and predicts residence time at places to determine efficient sensing schedules. Our experiment results show that SmartDC consumes 81 percent less energy than the periodic sensing schemes, and 87 percent less energy than a scheme employing context-aware sensing, yet it still correctly monitors 90 percent of a user's location changes within a 160-second delay.</P>