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Multi-sensor data-based anomaly detection and diagnosis of a pumped storage hydropower plant
Sojin Shin,Cheolgyu Hyun,Seongpil Cho,Phill-Seung Lee 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.88 No.6
This paper introduces a system to detect and diagnose anomalies in pumped storage hydropower plants. We collect data from various types of sensors, including those monitoring temperature, vibration, and power. The data are classified according to the operation modes (pump and turbine operation modes) and normalized to remove the influence of the external environment. To detect anomalies and diagnose their types, we adopt a multivariate normal distribution analysis by learning the distribution of the normal data. The feasibility of the proposed system is evaluated using actual monitoring data of a pumped storage hydropower plant. The proposed system can be used to implement condition monitoring systems for other plants through modifications.
Democratic Transitions in South Asia: Prospects and Problems in Afghanistan and Bhutan
( Sojin Shin ) 인제대학교 민주주의와자치연구소(구 비교민주주의연구센터) 2019 비교민주주의연구 Vol.15 No.2
What is democracy in South Asia? How do the states in the region transform into democracy, and how does the democratic regime operate in the socio-political and economic spheres? This article explains the recent democratic transitions of eight countries in South Asia, namely, Afghanistan, Bangladesh, Bhutan, India, the Maldives, Nepal, Pakistan, and Sri Lanka, in the past decade. It also analyzes the opportunities and challenges of the region’s democratic movement through two select nations, Afghanistan and Bhutan, which have not yet reached to full-fledged democracy but in the gradual process of democratic transition. I argue that the political and financial insecurity has demoralized Afghanistan’s dream for democracy, while a unique development regime based on an anti-ethnic minority stance has acted as a barrier for Bhutan to be an inclusive and integrated democratic nation. Such challenges, however, which Afghanistan and Bhutan have encountered, are also frequently observed in other democratic regimes in South Asia, which are ‘not fully-functioning’ democracies.
Sojin Shin(신소진) 한국초등영어교육학회 2018 초등영어교육 Vol.24 No.2
Living in the digital era with the rapid growth of mass media, visual literacy has become an essential competence to acquire in order to understand the implicit information in the visual medium. The present study explored how 24 Korean elementary school students participated in meaning-making for visual information and constructed visual literacy in response to a postmodern picturebook, Anthony Browne’s (1999) Voices in the Park. Using a qualitative research method, the study collected and analyzed data from students’ oral discussion transcripts, written response journals, and teacher field notes. The results showed that Korean elementary school students were able to construct visual literacy through reading the postmodern picturebook. Further, using postmodern picturebooks in an EFL classroom had the potential to promote students’ language learning.
신소진 ( Shin Sojin ) 글로벌영어교육학회(구 호남영어교육학회) 2018 Studies in English education Vol.23 No.1
Recently, one of the main educational aims in Korea has been to foster students’ creativity. With the constant emphasis on its importance in the field of education, the present study analyzed research trends to identify the characteristics and developmental status of creativity education in English education in Korea. This study examined 54 research articles with three main categories of analysis: 1) research status, 2) subjects and methods, 3) topics and types of creativity education. The results showed that the number of research articles has gradually increased since 2007 and the largest number of them focused on elementary English education. Among the various subjects, students were the main focal points for many studies. Also, the most preferred topic was the development of teaching and learning methods and materials. This study suggests pedagogical implications for creativity education in English education.
Heewoong Shin,Sojin Oh,전혜지,오문현 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.2
The preparation of catalytically active composites consisting of a porous support and metal nanocatalysts is vital for the development of efficient catalytic systems. In particular, the development of porous composites containing inexpensive metal nanocatalysts instead of expensive noble metals is of great importance. Herein, we report the preparation of porous composites consisting of porous carbon (PC) or a zeolitic imidazolate framework (ZIF) as a support material, along with inexpensive Cu and Co as nanocatalysts. A composite of ZIF-67 and metallic Cu nanoparticles (Cu@ZIF-67) was produced from the simple thermal treatment of Cu2+-incorporating ZIF-67 (ZIF-67/Cu2+) at 450°C. However, the high-temperature pyrolysis of ZIF-67/Cu2+ at 800°C resulted in a PC-based composite containing metallic Cu and Co nanoparticles (Cu,Co@PC). The resulting Cu@ZIF-67 and Cu,Co@PC samples exhibited efficient catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol.