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Jeong Dongyeon,Cho Inn-Kyu,Kim Kyumin,Lee Joohee,Choi Jung Mun,Kim Jiyeon,Kim Changnam,Yoo Soyoung,Chung Seockhoon 대한신경정신의학회 2022 PSYCHIATRY INVESTIGATION Vol.19 No.7
Objective We aimed to explore the influence of public workers’ distress or viral anxiety on their level of depression and work engagement during the coronavirus disease (COVID-19) pandemic. Additionally, we ascertain the mediation effect of resilience and public service motivation on this association.Methods A total of 300 public workers participated in this online survey. Their demographic characteristics and responses to survey items were collected using the Stress and Anxiety to Viral Epidemics–6 items Scale, the Patient Health Questionnaire–9 items Scale, the Public Service Motivation (PSM) Scale, the Nine-item Utrecht Work Engagement Scale, the Korean Occupational Stress Scale–Short Form, and the Brief Resilience Scale.Results Work engagement of public workers was expected by PSM (β=0.28, p<0.001), resilience (β=0.30, p<0.001), and work-related stress (β=-0.40, p<0.001) (F=57.4, p<0.001). Depression was expected by fewer years of employment (β=-0.12, p=0.02), viral anxiety (β= 0.21, p<0.001), and low resilience (β=-0.42, p<0.001) (F=22.1, p<0.001). Resilience and PSM partially mediated the effects of work-related stress on work engagement. Depression was influenced by COVID-19–induced viral anxiety, and their resilience—but not PSM—mediated the association.Conclusion Public workers’ resilience and PSM partially mediated the effects of work-related stress on work engagement. The influence of viral anxiety on public workers’ depression was mediated by their resilience but not PSM.
MAPLE: Mobility support using asymmetric transmit power in low-power and lossy networks
Jeong, Seungbeom,Park, Eunjeong,Woo, Dongyeon,Kim, Hyung-Sin,Paek, Jeongyeup,Bahk, Saewoong Editorial Department of Journal of Communications 2018 Journal of communications and networks Vol.20 No.4
<P>With the proliferation of emerging Internet of Things (IoT) devices and applications, mobility is becoming an integral part of low-power and lossy networks (LLNs). However, most LLN protocols have not yet focused on the support for mobility with an excuse of resource constraints. Some work that do provide mobility support fail to consider radio duty-cycling, control overhead, or memory usage, which are critical on resource-limited lowpower devices. In this paper, we introduce MAPLE, an asymmetric transmit power-based routing architecture that leverages a single resource-rich LLN border router. MAPLE supports mobility in duty-cycled LLNs using received signal strength indicator (RSSI) gradient field-based routing. High-power transmission of the gateway not only allows LLN endpoints to be synchronized for low duty-cycle operation, but also establishes an RSSI gradient field which can be exploited for opportunistic routing without a need for any neighbor or routing table. This eliminates the scalability problem due to memory limitation, and provides a responsive routing metric without control overhead. MAPLE also addresses the RSSI local maximum problem through local adaptation. We implement MAPLE on a low-power embedded platform, and evaluate through experimental measurements on a real multihop LLN testbed consisting of 31 low-power ZigBee nodes and 1 high-power gateway. We show that MAPLE improves the performance of mobile devices in LLN by 27.2%/55.7% and 17.9% in terms of both uplink/downlink reliability and energy efficiency, respectively.</P>
Evaluating psychological anxiety in patients receiving radiation therapy using smartwatch
Jeong Sangwoon,Jeon Chanil,Lee Dongyeon,Park Won,Pyo Hongryull,Han Youngyih 대한방사선종양학회 2024 대한방사선종양학회지 Vol.42 No.2
Purpose: Patients undergoing radiation therapy (RT) often experience psychological anxiety that manifests as muscle contraction. Our study explored psychological anxiety in these patients by using biological signals recorded using a smartwatch.Materials and Methods: Informed consent was obtained from participating patients prior to the initiation of RT. The patients wore a smartwatch from the waiting room until the conclusion of the treatment. The smartwatch acquired data related to heart rate features (average, minimum, and maximum) and stress score features (average, minimum, and maximum). On the first day of treatment, we analyzed the participants' heart rates and stress scores before and during the treatment. The acquired data were categorized according to sex and age. For patients with more than three days of data, we observed trends in heart rate during treatment relative to heart rate before treatment (HRtb) over the course of treatment. Statistical analyses were performed using the Wilcoxon signed-rank test and paired t-test.Results: Twenty-nine individuals participated in the study, of which 17 had more than 3 days of data. During treatment, all patients exhibited elevated heart rates and stress scores, particularly those in the younger groups. The HRtb levels decreased as treatment progresses. Conclusion: Patients undergoing RT experience notable psychological anxiety, which tends to diminish as the treatment progresses. Early stage interventions are crucial to alleviate patient anxiety during RT.
Kim Doyeub,Jeong Incheol,Kim Kyeong Joon,Bae Kyung Taek,Kim Dongyeon,구종언,Yu Hyeongmin,Lee Kang Taek 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.2
Solid oxide fuel cells (SOFCs), which are widely viewed as the next-generation energy conversion devices, provide envi- ronmentally friendly power generation by direct conversion of chemical energy with high effi ciency and less pollutant emissions. However, their high operating temperatures limit their usability in applications, such as distributed generation of electricity and heat, power plants, and transportation. At reduced temperatures, the electrolytes and electrodes used in SOFCs experience sluggish oxygen transport kinetics. Therefore, the development of materials with high oxygen ion conduction and unique cell designs is needed to achieve higher performance. This article provides an overview of the recent progress on solid oxide electrolyte materials, unique cell designs featuring bilayer electrolytes, and resulting microstructures at lower operating temperatures.
PATH GENERATION ALGORITHM BASED ON CRASH POINT PREDICTION FOR LANE CHANGING OF AUTONOMOUS VEHICLES
Chanho Park,Nak-Tak Jeong,Dongyeon Yu,Sung-Ho Hwang 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.3
To reduce the calculation time needed to determine the optimal path, the form of the road and the path of an autonomous vehicle were linearized; additionally, among multiple obstacles, only those that were potentially dangerous were chosen. By considering the movement of moving obstacles, the cost was calculated. The calculation time was shortened by reducing the number of design variables of the optimal path, when changing lanes to avoid obstacles, to two. Limiting conditions, such as the lateral and longitudinal acceleration, were excluded from the cost calculation by restricting the search region of the design variable. The final result was calculated using a relatively free search of the golden-section search regarding the initial value setting. For the golden-section search, the number of final design variables was reduced to one; this was done by optimizing the search direction. The search direction was determined based on the final position of the vehicles and the calculated optimal points. By including a collision avoidance algorithm and moving in a short period of time, the calculated optimal path prevented accidents due to path errors caused by simplification. The path could be found easily, even for complex road shapes and with multiple vehicles nearby.
Recent progress in oxygen electrodes for protonic ceramic electrochemical cells
Oh Seeun,Kim Hyeonggeun,Jeong Incheol,Kim Dongyeon,Yu Hyeongmin,Lee Kang Taek 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.2
Protonic ceramic electrochemical cells, a promising technology for energy conversion and storage, have garnered significant interest in recent years owing to their superior low-temperature (< 600 °C) performance relative to solid oxide electrochemical cells. However, the sluggish kinetics of oxygen electrodes have impeded further advancements. Despite considerable research efforts, the development of practically applicable oxygen electrodes remains challenging. We herein review the recent research focusing on the fundamental understanding and development of oxygen electrode materials. Furthermore, we provide a range of material design strategies for enhancing the catalytic activity of oxygen electrodes along with a concise overview of potential derivative applications. Finally, the perspectives and potential directions for the development of oxygen electrodes for high-performance protonic ceramic electrochemical cells are presented.