• KSII Transactions on Internet and Information Systems (TIIS)
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• v.18 no.4
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• pp.980-997
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• 2024

To improve the brightness of images and reveal hidden information in dark areas is the main objective of low-light image enhancement (LLIE). LLIE methods based on deep learning show good performance. However, there are some limitations to these methods, such as the complex network model requires highly configurable environments, and deficient enhancement of edge details leads to blurring of the target content. Single-scale feature extraction results in the insufficient recovery of the hidden content of the enhanced images. This paper proposed an edge detection-based multi-scale feature enhancement network for LLIE (EDMFEN). To reduce the loss of edge details in the enhanced images, an edge extraction module consisting of a Sobel operator is introduced to obtain edge information by computing gradients of images. In addition, a multi-scale feature enhancement module (MSFEM) consisting of multi-scale feature extraction block (MSFEB) and a spatial attention mechanism is proposed to thoroughly recover the hidden content of the enhanced images and obtain richer features. Since the fused features may contain some useless information, the MSFEB is introduced so as to obtain the image features with different perceptual fields. To use the multi-scale features more effectively, a spatial attention mechanism module is used to retain the key features and improve the model performance after fusing multi-scale features. Experimental results on two datasets and five baseline datasets show that EDMFEN has good performance when compared with the stateof-the-art LLIE methods.

• The Journal of Korean Medicine
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• v.34 no.1
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• pp.179-191
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• 2013

Kleine-Levin syndrome is a rare disorder characterized by recurrent episodes of hypersomnia, hyperphagia, hypersexuality and delusion and hallucination with spontaneous recovery. A 17-year-old female suddenly showed hypersomnia, severe fatigue, and compulsive hyperphagia. She was diagnosed with suspected Kleine-Levin Syndrome. The precipitating factor was an upper respiratory tract infection that the patient had undergone 2 weeks prior. Past psychiatric history included somnambulism and ADHD; her symptoms of ADHD included attention deficit, impulsiveness, hyperactivity, and irritability. This was her third episode. Her hypersomnia was longer in duration but lower in frequency compared with usual KLS. Her low LF/HF ratio in heart rate variability measurement showed high parasympathetic nerve activity. A MMPI report showed some psychological problem. The patient was diagnosed of gastric fever by pattern identification. Her hypersomnia episode improved 6 weeks after onset. This is the first reported case of suspected Kleine-Levin Syndrome in the field of Oriental Medicine in Korea.

• Proceedings of the KIPE Conference
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• 2011.11a
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• pp.44-45
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• 2011

Research on photovoltaic (PV) generation is taking a lot of attention due to its infinity and environment-friendliness with decrease of price per PV cell. While central inverters connect group of PV modules to utility grid in which maximum power point tracking (MPPT) for each module is difficult, micro inverter is attached on each module so that MPPT for individual modules can be easily achieved. Moreover, energy generation and consumption efficiency can be much improved by employing direct current (DC) distribution system. In this paper, a digitally controlled PV micro converter interfacing PV to DC distribution system is proposed. Boundary conduction mode (BCM) is utilized to achieve zero voltage switching (ZVS) of active switch and eliminate reverse recovery problem of passive switch. A 120W prototype boost PV micro converter is implemented to verify the feasibility and experimental results show higher than 98% efficiency at peak power and 97.29% of European efficiency.

• Proceedings of the Korean Geotechical Society Conference
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• 1999.10a
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• pp.331-336
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• 1999

A great deal of attention has been given in recent years to large diameter specimen for evaluation of soft soil characteristics, and many studies and developments of the apparatus for obtaining large diameter undisturbed soil samples are in progress attempting to minimize the disturbance of samples for precise strength and consolidation tests in the laboratory. This paper introduces a new large diameter sampler(over 300mm diameter), which can take prefectly undisturbed sampling at any depths applying a new sampling technique. By comparing the results of consolidation tests it is shown that the samples obtained by this new apparatus are of a superior quality to that of samples obtained by conventional sampler(Nx, 75mm dia.) at the same depths.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.27 no.2
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• pp.184-188
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• 2001

Horner's syndrome as a complication of orthognathic surgery is given little attention of head and neck surgery and is a relatively benign and transient condition. A 18-year-old male referred to our department with long and anteriorly projected chin. The cephalometric evaluation revealed a skeletal Class III relationship. A 10-mm setback of the mandible to eliminate Class III relationship and 4-mm vertical reduction genioplasty were performed. Three weeks after operation, the patient was recognized anhidrosis in left face and the head, and ptosis of left eye. The trauma to cervical sympathetic nerve during left sagittal split ramus osteotomy was thought to be the cause of Horner's syndrome. Patient was treated by dermatologic and opthalmologic care. Follow-up examination 8 months later, he was recovery of horner's symptom.

• Proceedings of the KSRS Conference
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• 1999.11a
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• pp.243-248
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• 1999

From the lessons after the Nakhodka oil-spill in Jan. 1997, oil slick detection by using remote sensing data and assimilating the data to the simulation program is important for monitoring the oil-drift pattern. For this object, we are going to construct the oil-spill warning system for estimating the oil-drift pattern using remotesensing/numerical simulation Model. Additionally we plan to use this system for restorating oil-spill damage domestically, such as estimating the ecological damage and making the priority fur restorating the oil-spilled shoreline. This report is intended to summarize the role of geo-informatics in the oil spill accident by not only paying attention to the effect of information provision/information management via the map, but also reporting the interim result in part based on the details discussed in the processes of recovery support and environmental impact assessment during the Nakhodka's accident.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• v.21 no.1
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• pp.12-19
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• 2018

Pediatric patients require specialized attention and have diverse demands for proper growth and development, and thus need a different approach and interest in nutritional assessment and supply. Enteral nutrition is the most basic and important method of nutritional intervention, and its indications should be identified. Also, the sites, modes, types, and timing of nutritional intervention according to the patient's condition should be determined. In addition, various complications associated with enteral nutrition supply should be identified, and prevention and treatment are required. This approach to enteral nutrition and proper administration can help in the proper growth and recovery of pediatric patients with nutritional imbalances or nutritional needs.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.137-142
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• 2007

한정된 주의력 자원을 회복 시키기 위한 방법 중 피드백이 효과가 있는 것으로 보고되고 있다. 그러나 피드백의 구체적 내용에 대한 집중력 회복의 연구는 미미하다. 본 연구는 집중력을 회복할 수 있는 감각적 자극 중 정서적 피드백 간의 효과 차이를 분석 하였다. 집중력을 평가하기 위한 온라인 실험 시스템을 구축하고 시각, 청각, 촉각 피드백 자극을 제시하여 각각의 감각자극과 집중력 회복의 효과를 분석 하였다. 실험 참여자의 감각 피드백의 선호도에 따른 영향 요인을 알아보기 위하여 실험 후 주관적 설문을 실시하였다. 감각 피드백을 6명의 대학원생에게 일주일에 걸쳐 반복적으로 약200개의 자극을 제시하고 5회 이상 실험을 통하여 얻어진 30회 결과를 분석하였다. 결과적으로 피드백 별 수행 수준에서는 청각, 촉각, 시각 순으로 효과가 높았으며, 반응 시간에서는 촉각, 청각, 시각 순으로 효과적으로 나타났다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.27 no.3
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• pp.464-471
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• 2003

Among various methods to acquire high strength in plain carbon steel, the mettled of grain refinement by controlling thermo-mechanical processing parameters has gained a great attention if steel rolling industries. In the present study, three different rolling pass schedules are proposed to obtain fine grains which are based on combined results of recrystallization modelling, finite element analysis and experiment. Since meta-dynamic or dynamic recrystallization has been found to be very effective in producing fine grains, reduction ratio and interpass time in the proposed rolling pass schedules were determined in order to invoke such recrystallization as often as possible.

• 한국전산유체공학회:학술대회논문집
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• 2011.05a
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• pp.608-609
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• 2011

In this study, we tried to validate FLUENT solver model and domain setting for the problem of convective heat transfer in multiple tube bank under transitional zone. We have paid special attention to verify proper boundary conditions and the grid convergence. Through validation work, it is found that unsteady solution method with two-dimensional simulation domain can produce reasonable accurate results compared with existing experimental data. Simulation results with steady solution generates relatively large error. We found that both steady and unsteady method for three-dimensional domain shows acceptable accuracy. Further parametric study for deriving correlation from transverse and longitudinal pitch is currently underway.