• The Journal of Korean Institute of Information Technology
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• v.16 no.11
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• pp.85-95
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• 2018

With the popularity of smartphones, most peoples have been using mobile cameras to capture photographs. However, due to insufficient amount of lights in a low lighting condition, unwanted noises can be generated during image acquisition. To remove the noise, a method of using deep convolutional neural networks is introduced. However, this method still lacks the ability to describe textures and edges, even though it has made significant progress in terms of visual quality performance. Therefore, in this paper, the HOG (Histogram of Oriented Gradients) images that contain information about edge orientations are used. More specifically, a method of learning deep convolutional neural networks is proposed by stacking noise and HOG images into an input tensor. Experiment results confirm that the proposed method not only can obtain excellent result in visual quality evaluations, compared to conventional methods, but also enable textures and edges to be improved visually.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.30 no.1
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• pp.34-41
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• 2019

Objectives: We aimed to compare preterm, neurodevelopmentally disordered and healthy full-term children. Methods: We enrolled 47 children who were born preterm, 40 neurodevelopmentally disordered children, and 80 healthy children as control participants, in order to assess the cognitive functioning and the risk of behavioral problems at the age of 5. Children were assessed using the Korean Wechsler Preschool and Primary Scale of Intelligence-4th edition (K-WPPSI-IV), the Child Behavior Checklist (CBCL), and the Temperament and Character Inventory (TCI). Results: The mean K-WPPSI-IV score of the preterm group was $87.19{\pm}17.36$, which was significantly higher than that of the neurodevelopmental disorder group ($69.98{\pm}28.63$; p<0.001) but lower than that of the control group ($107.74{\pm}14.21$; p<0.001). The cumulative CBCL scores of the preterm children were not significantly different from those of the control group. Additionally, the TCI scores for reward dependence of the preterm children were higher than those of the control group. Conclusion: The cognitive performance of preterm infants was lower than that of healthy full-term infants at the age of 5, and there was an association between slower growth and decreased cognitive ability.

• The Korean Journal of Applied Statistics
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• v.31 no.6
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• pp.693-706
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• 2018

It is very important to support the elderly with disability ageing in place. Assisting devices can help them to live independently in their community; however, they have to be used appropriately to meet care needs. This study develops an assisting device recommendation system for the beneficiaries of long-term care insurance that include algorithms to decide the most appropriate type of assisting device for beneficiaries. We used long-term care (LTC) insurance data for grade assessment including 8,084 beneficiaries from July 2015 to June 2016. In addition, we collected standard care plans for assisting devices, that power-assessors made, considering their performance and ability that could subsequently be matched with grade assessment data. We used a decision-tree model in data-mining to develop the model. Finally, we developed 15 algorithms for recommending assisting devices. The findings might be useful in evidence-based care planning for assisting devices and can contribute to enhancing independence and safety in LTC.

• Journal of Engineering Education Research
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• v.21 no.6
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• pp.35-43
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• 2018

In many universities, the Capstone Design course aims to educate creativity, teamwork and leadership, and ultimately aims to cultivate practitioners with practical ability required in the industry. Since the introduction of capstone design as a regular course, it has spread not only to engineering but also to the humanities and social sciences. A typical capstone design is usually carried out within a limited range of schedules and budgets within the scope of a major and a subject. In the case of a special-purpose capstone design, it is necessary to find out excellent items aiming at start-up and commercialization at an early stage, It contributes to the achievement of international convention participation, start-up and commercialization. The teaching styles of capstone design such as multidisciplinary capstone design, fusion capstone design, and global capstone design are developed and operated in various ways. Depending on each type, objectives, curriculum, scope of participation, operation method, performance and so on. In the case of capstone design, it is contributing to increase the achievements such as participation in international conventions, establishment of business and commercialization by early detection of excellent items aiming at start-up and commercialization, development and establishment of support process. Technological and Humanities Convergence Capstone Design Moel is named as the process of designing a four-level idea called "Idea Factory-based Technology-Humannities Fusion Capstone Design Process", and it is used to generate ideas, elaborate ideas, advanced ideas, and commercialization.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.11
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• pp.332-337
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• 2018

Aircraft searchlights are used in search or rescue missions when performing night missions, and provide infrared light to keep operations in concealment. During aircraft operation, the infrared ray transmission filter glass for generating infrared rays can break, resulting in problems such as loss of concealment ability and maintenance. In this paper, we describe the procedure for testing the operating conditions of the searchlight when the defect occurs and finding the cause of the defect. We also summarize various methods to improve the cause and process of making the improved filter prototype. In addition, we also describe the results of verifying the performance requirements of the searchlight. As a result of the test and verification, the damage of the filter was improved and the improved filter was applied to the aircraft.

• The Journal of Korean Association of Computer Education
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• v.21 no.6
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• pp.105-115
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• 2018

The descriptive-type question is appropriate for deep thinking ability evaluation, but it is not easy to grade. Since, even though same grading criterion, the graders produce different scores, we need the objective evaluation system. However, the system needs the Korean analysis. As the descriptive-type answering is described with the compound sentence, the system has to analyze the compound sentence. This paper develops the Korean syntactic-semantic analysis system for compound sentence and evaluates performance of the system. This system selects the modifiee of the word phrase using syntactic-semantic constraint and semantic dictionary. The 93% accurate rate shows that the system is effective. This system will be utilized in descriptive-type grading and Korean processing.

• Journal of the Korea Computer Graphics Society
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• v.25 no.3
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• pp.65-73
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• 2019

Recently commercial mixed-reality devices have be launched and a variety of mixed-reality content has produced, but narrow field of view, which appear to be hardware technical limitations, are mentioned as an important issue for hindering immersion and limiting the scope of use. We propose a new innovative system that cooperate multiple beam projectors and a number of mixed reality devices. Using this technology, users can maximize immersion and minimize frustration of narrow viewing angles through 3D object rendering on background of large 2D screens. This system, named BtS (Beyond the Sight), is implemented on a client-server basis and includes the ability to calibrate between devices, share spatial coordinate systems, and synchronize real-time renderings as core modules. In this paper, each configuration module is described in detail and the possibility of its performance and application is shown through the introduction of mixed reality content case created using BtS system.

• Korean Journal of Applied Biomechanics
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• v.29 no.2
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• pp.53-60
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• 2019

Objective: The purpose of this study was to investigate the differences of smoothness and coordination of the fingers and upper extremities between skilled and non-skilled players during receiving the basketball. Method: Ten male recreational basketball players (age: $23.2{\pm}2.7yrs.$, career: $8.6{\pm}1.6yrs.$, height: $177.3{\pm}6.0$, weight: $72.9{\pm}8.5kg$) careering over five years and ten non-skilled males (age: $27.3{\pm}1.5yrs.$, height: $173.7{\pm}5.6$, weight: $73.2{\pm}12.6kg$) were participated in this study. Then, participants were asked to perform basketball receiving movement for ten times. The receiving movements were recorded by eight infrared cameras (Oqus 300, Qualisys, Sweden). The collected rad data were calculated to duration of basketball receiving, Jerk-Cost, CRP and CRP variability. Results: The CRP of MCP-Wr, Wr-El in skilled group were greater than non-skilled group (p<.05). The CRP variability of El-Sh in non-skilled group was greater than skilled group (p<.05). Conclusion: These results suggest that skilled players perform more effective movement for impact absorption from the basketball. Moreover, the skilled players have consistent movement patterns during basketball performance. Lastly, it is important to train finger sensation and cognitive ability of thrown basketball from the passer.

• Journal of the Korea institute for structural maintenance and inspection
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• v.23 no.4
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• pp.131-136
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• 2019

Buildability of fresh concrete, a key element of Concrete 3D printing, is the ability to build filaments at a desirable height without excessive deformation or collapse. Buildability is closely related to yield stress, and the higher the yield stress, the better. Also, the shear stress of fresh concrete increases as it hardens over the time after extruded, and consequently the buildability increases. Therefore, in concrete 3D printing, proper time gaps between printed layers (Printing Time Gap, PTG) are required to ensure the buildability of fresh concrete. As the PTG increases, the buildability increases; however, an excessive PTG reduces the bond performance between the printed layers, and the extrudability can be lowered as the printing time increases. In this research, therefore, 3D printing experiments were conducted with the variable of PTG to examine the buildability of 100 MPa-high strength concrete. In addition, a pseudo-layer loading method was applied to simulate the buildability test for 3D concrete printing and its applicability was examined.

• Journal of The Korean Society of Clinical Toxicology
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• v.16 no.2
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• pp.149-156
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• 2018

Purpose: The purpose of this study was to determine whether hepatotoxicity could be predicted early using biochemical markers in patients with acetaminophen (AAP) poisoning and to assess the usefulness of predictive factors for acute liver injury or hepatotoxicity. Methods: This study was a retrospective observational study involving a medical records review. The participants were patients who were admitted to the emergency department (ED) with AAP overdose at two hospitals over a 10-year period. Demographic data, age, time from ingestion to visit, initial AAP level, initial hepatic aminotransferases, and initial prothrombin time were recorded. Acute liver injury was defined as a peak serum ALT >50 U/L or double the admission value, and hepatotoxicity was defined as a peak ALT >1,000 U/L. Receiver operating characteristic curve analyses were performed to compare the prognostic performance among variables. Results: A total of 97 patients were admitted to the ED with AAP overdose, of whom 26 had acute liver injury and 6 had hepatotoxicity. Acute liver injury was associated with the time interval after taking the drug, and hepatotoxicity was associated with the initial PT and the ALT level. The scoring system proposed by the authors has a significant ability to predict both acute liver injury and hepatotoxicity. Conclusion: To predict the prognosis of AAP poisoning patients, the time interval after taking AAP was important, and initial prothrombin time and ALT level were useful tests. Also a scoring system combining variables may be useful.