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Error Analysis on Double Sideband Antenna Effect
Jeongil Moon,Yoonsik Kwak 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.3
This paper analyzes the influence of amplitude and phase error of a faults on sideband antennas which can be used as a DSB. The ability of a standard VOR system to provide accurate bearing information to a flying aircraft depends on many factors, for example, the transmitting antenna radiation characteristics, the terrain surrounding the transmitting antenna, the aircraft receiver characteristics, the aircraft receiving antenna, etc. An antenna system consists of a carrier and sideband antenna. Up to date FAA require extensive site preparation for a standard system to be installed. This paper describes the effect of fault on a double sideband antenna. It is hoped that the information provided may be found useful in determining the improvement in siting errors that may be expected with an antenna system under a specified set of conditions and in evaluating the siting errors in the existing systems under specified set of conditions
Moon, YoungJun,Jeong, DaeKeun,Kang, Jeongil International Academy of Physical Therapy Research 2019 Journal of International Academy of Physical Ther Vol.10 No.3
Background: Stroke patients require arm movement exercising for various stimulations in standing position for various stimulations rather than in a sitting position because they require integrated skillful movements, such as stretching, holding, and controlling. Objective: This study was conducted to provide foundational clinical data about lower limb global synkinesis in stroke patients using arm movements in a standing position. Design: Randomized controlled trial. Methods: The subjects were divided into a control group (n = 10) and an experimental group (n = 10), and a pre-test was conducted to evaluate leg global synkinesis (GS) and balance. Intervention method is stretching an arm to hold a ball, repeating supination and pronation of the hand only while maintaining the arm extended as much as possible, repeating shoulder abduction and adduction while holding the pegboard. This was followed by a three-week intervention during which re-measurement was conducted in the same way as was done for the pre-test. Results: The control group showed a significant difference in GS and balance during plantar flexion (p<.05), and the experimental group showed a significant difference in GS and balance during all movements (p<.05, p<.01, respectively). There was a significant difference in GS and balance between the two groups during dorsiflexion (p<.05, p<.01, respectively). Conclusion: The findings demonstrate that human arm movements in a standing position can reduce GS in the affected limb, and balance can be improved by stimulating the surrounding tissues of the affected limb and changing them positively.
Jeongil Kang,Huikyeong Kim,Daekeun Jeong,Seungkyu Park,Daejung Yang,Jeho Kim,Youngjun Moon 국제물리치료연구학회 2020 Journal of International Academy of Physical Ther Vol.11 No.1
Background: Multifaceted approaches will be needed, such as global synkinesis (GS) achieve functional improvements in the arms of stroke patients from involuntary movements during exercise. Objective: To identify changes in arm GS and muscle activity, functional evaluation and the correlation with variables through action observation training, combined with functional electrical stimulation (FES), thereby verifying the effect on stroke patients. Design: A quasi-experimental study. Methods: The subjects of this study were 20 stroke patients who were divided into two groups: Control group (n=10) and experimental group (n=10). Before the intervention, arm GS and muscle activity were measured using surface electromyography (EMG), and arm function was evaluated using the Fugl– Meyer Assessment (FMA) scale. At the end of the intervention, which lasted 4-wk, arm GS and muscle activity were measured again using the same scale. Results: There was a decrease statistically significant difference in GS during the bending action in experimental group (P<.01). Both groups showed a significant difference increased only in the activity of the anterior deltoid (AD) and biceps brachii (BB) (P<.05). The results of the arm functional assessment revealed a significant difference increase in both groups (P<.05). In the between-group comparison, there was a significant difference decrease in GS during the bending action (P<.05). Only the muscle activity of the AD and BB were significantly increase different (P<.05). There was a significant betweengroup difference increase in the arm functional assessment (P<.05). There was a positive correlation between GS and muscle activity on the FMA in the control group (r=.678, P<.05). In experimental group, GS during the bending arm action exhibited a negative correlation (r=-.749, P<.05), and the muscle activity of the AD and BB showed a positive correlation (r=.701, P<.05). Furthermore, in experimental group, the activity of the extensor carpi radialis increased, and the activity of the flexor carpi radialis decreased, which exhibited a negative correlation (r=-.708, P<.05). Conclusion: These results suggest that brain plasticity could be more efficiently stimulated by combining surface stimulation in the affected arm of stroke patients.
YoungJun Moon,Daekeun Jeong,Jeongil Kang 국제물리치료연구학회 2019 Journal of International Academy of Physical Ther Vol.10 No.3
Background: Stroke patients require arm movement exercising for various stimulations in standing position for various stimulations rather than in a sitting position because they require integrated skillful movements, such as stretching, holding, and controlling. Objective: This study was conducted to provide foundational clinical data about lower limb global synkinesis in stroke patients using arm movements in a standing position. Design: Randomized controlled trial. Methods: The subjects were divided into a control group (n = 10) and an experimental group (n = 10), and a pre-test was conducted to evaluate leg global synkinesis (GS) and balance. Intervention method is stretching an arm to hold a ball, repeating supination and pronation of the hand only while maintaining the arm extended as much as possible, repeating shoulder abduction and adduction while holding the pegboard. This was followed by a three-week intervention during which re-measurement was conducted in the same way as was done for the pre-test. Results: The control group showed a significant difference in GS and balance during plantar flexion (p<.05), and the experimental group showed a significant difference in GS and balance during all movements (p<.05, p<.01, respectively). There was a significant difference in GS and balance between the two groups during dorsiflexion (p<.05, p<.01, respectively). Conclusion: The findings demonstrate that human arm movements in a standing position can reduce GS in the affected limb, and balance can be improved by stimulating the surrounding tissues of the affected limb and changing them positively.
항공사 객실 승무원의 자아상태가 직무만족과 고객지향성에 미치는 영향 - 교류분석을 중심으로 -
문지원 ( Jiwon Moon ),연지영 ( Jiyoung Yeon ),최정일 ( Jeongil Choi ) 한국품질경영학회 2018 품질경영학회지 Vol.46 No.1
Purpose: This study attempted to analyze how the ego state of flight attendants affects their job satisfaction and customer orientation using Berne’s (1966) transactional analysis and further compare the difference between job satisfaction and customer orientation depending on demographic characteristics, position, and ego state. Methods: The data was collected by using the structured questionnaires to flight attendant of major airline companies. The proposed research model is tested using 164 valid questionnaires using SPSS 23 and Smart PLS 2. Results: This research indicated the only free child ego sate among ego state factors of flight attendant was found to have a positive impact on job satisfaction. In the relationship between ego states and customer orientation, all ego state factors were found to have a significant influence on customer orientation. Conclusions: The study offered a theoretical and empirical foundation for future research by empirically identifying the relationship between ego state factors and customer orientation in the in-flight service and suggested the strategic implications to increase job satisfaction and customer orientation based on the psychology and ego state of flight attendant.
Design and Implementation of Context Aware Sensor Tags for Distribution Measurement of Farm Products
Yoonsik Kwak,Byungju Lee,Jeongil Moon,Donghee Park,Youngsik Kwak,Seokil Song 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.7
This paper discusses the design and implementation of context-aware sensor tags that can be attached to various containers. The tags are designed to be utilizable in non-standardized fruit boxes, and can identify whether fruit has been loaded in a box because they are attached inside the box. After recognizing normal load status, data are sent only when there is content. The tags were designed and implemented to measure distribution by detecting the movement of the fruit box, and sending data through a context-aware function that determines whether fruit is loaded, and a data-transmission event; the tags also send data periodically, even when the fruit box is not moved
Meta Pseudo Labels 기반 딥페이크 영상 검출
문경환(Kyeong-Hwan Moon),옥수열(Soo-Yul Ok),서정일(Jeongil Seo),이석환(Suk-Hwan Lee) 한국멀티미디어학회 2024 멀티미디어학회논문지 Vol.27 No.1
Recently, there has been considerable research on deepfake detection. However, most existing methods face challenges in adapting to the advancements in new generative models within unknown domains. In this paper, our objective is to detect deepfake videos in unknown domains using unlabeled data. Specifically, our proposed approach employs Meta Pseudo Labels (MPL), allowing the model to be trained on unlabeled images. MPL involves the simultaneous training of both a Teacher model and a Student model, where the Teacher model generates Pseudo Labels utilized to train the Student model. This method aims to enhance the adaptability and robustness of deepfake detection systems against emerging unknown domains. The experimental results demonstrate an improvement of 1.91% and 1.87% in ACC and AUROC, respectively, for the known domain. Similarly, in the unknown domain, there is an enhancement of 1.59% in ACC and 1.29% in AUROC.