• KSII Transactions on Internet and Information Systems (TIIS)
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• v.15 no.2
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• pp.713-728
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• 2021

This paper proposes an augmented reality technique to generate acrobatic scenes from hitting motion videos. After a user shoots a motion that mimics hitting an object with hands or feet, their pose is analyzed using motion tracking with deep learning to track hand or foot movement while hitting the object. Hitting position and time are then extracted to generate the object's moving trajectory using physics optimization and synchronized with the video. The proposed method can create videos for hitting objects with feet, e.g. soccer ball lifting; fists, e.g. tap ball, etc. and is suitable for augmented reality applications to include virtual objects.

• International journal of advanced smart convergence
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• v.11 no.2
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• pp.185-193
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• 2022

There have been various studies in Korea to develop a %IMF(Intramuscular Fat Percentage) estimation method suitable for Hanwoo. Recently, a %IMF estimation method using a convolutional neural network (CNN), a kind of deep learning method among artificial intelligence methods, has been studied. In this study, we performed a performance comparison when various preprocessing methods were applied to the %IMF estimation of ultrasound images using CNN as mentioned above. The preprocessing methods used in this study are normalization, histogram equalization, edge enhancement, and a method combining normalization and edge enhancement. When estimating the %IMF of Hanwoo by the conventional method that did not apply preprocessing in the experiment, the accuracy was 98.2%. The other hand, we found that the accuracy improved to 99.5% when using preprocessing with histogram equalization alone or combined regularization and edge enhancement.

• Annual Conference of KIPS
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• 2020.11a
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• pp.659-662
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• 2020

최근 코로나 19로 인한 사회적 거리 두기 확산에 따라 언택트 문화가 새로운 패러다임으로 등장해 사회 전반으로 확산되고 있다. 언택트 문화의 확산으로 컴퓨터를 사용할 때 직접적인 접촉이 있는 키보드나 마우스 같은 입력장치는 공공장소에서 여러 사람이 접촉할 경우 문제가 생길 수 있다. 본 논문에서는 웹캠을 통해 입력된 영상에서 손동작을 인식하는 합성곱 신경망을 학습하고 결과로 나온 추론 모델을 이용하여 비접촉 가위바위보 게임을 구현하였다.

• Annual Conference of KIPS
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• 2020.11a
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• pp.1048-1051
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• 2020

본 논문에서는 사람의 손에 관한 개별적으로 분리되어 진행되고 있는 손 위치 추정, 손 자세 추정, 손 동작 인식 작업을 통합하는 Faster-RCNN기반의 프레임워크를 제안하였다. 제안된 프레임워크에서는 RGB 동영상을 입력으로 하여, 먼저 손 위치에 대한 박스를 생성하고, 생성된 박스 정보를 기반으로 손 자세와 동작을 인식하도록 한다. 손 위치, 손 자세, 손 동작에 대한 정답을 동시에 모두 가지는 데이터셋이 존재하지 않기 때문에 Egohands, FPHA 데이터를 동시에 효과적으로 사용하는 방안을 제안하였으며 제안된 프레임워크를 FPHA데이터에 평가하였다., 손 위치 추정 정확도는 mAP 90.3을 기록했고, 손 동작 인식은 FPHA의 정답을 사용한 정확도에 근접한 70.6%를 기록하였다.

• Advances in nano research
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• v.14 no.6
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• pp.527-539
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• 2023

Measuring energy burn during intensive combat sport has been a challenging concerns for a long time. In the present article, the energy consumption during combat sports is measured by use of wearable GoBe2 equipped with nanotechnology measuring devices. In this regard, 12 professional combat athletes were asked to wear GoBe2 devices during different sessions of intensive combat exercises. The curves provided by GoBe2 nano-sensor devices are further collected and analyzed for different combat durations. On the other hand, energy consumption in these athlete is calculated using other validated methods to evaluate reliability of GoBe2 wearable devices. Based on the results obtained from these experiments a multi-parameter mathematical model is presented for estimation of combat calorie consumptions. The results show that nanotechnology in these type of sensors could help in estimation of calorie consumption during combat. Moreover, the reliability of using wearable GoBe2 sensors are satisfactory except for some specific conditions. The mathematical model provides a satisfactory results based on athlete physical condition and also duration of the combat with about 8% error margin in the results.

• International conference on construction engineering and project management
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• 2024.07a
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• pp.1264-1271
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• 2024

Tatami serves as a multi-functional flooring and furniture material in traditional Japanese houses, and Westerners use it with suitable arrangements. Some choose to sleep on tatami for health reasons, while others adopt the lifestyle of 'floor living' to solve the spatial problems in cities. In any case, people use tatami for practical reasons rather than due to a cultural preference. I surveyed 750 respondents, including 463 non-Japanese people, and conducted both quantitative and qualitative analysis. I also interviewed European vendors and users of tatami during 2022-2023. The results showed that non-Japanese customers, especially Europeans, wanted authentic tatami mats made of natural materials such as igusa and rice straw to ensure health and sustainability. On the other hand, Japan's tatami industry is shifting towards artificial, or alternative, tatami-like mats. Few authentic tatami rooms exist in Japanese homes nowadays, and producers of tatami materials are almost extinct in Japan. Chinese farmers who supply almost 80% of igusa to the Japanese market may also discontinue their trade because the production is time-consuming and yields low profit. This paper discusses the possibilities of continuously producing and selling tatami in and outside Japan.

• Ocean and Polar Research
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• v.45 no.4
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• pp.219-228
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• 2023

One reason for the constant change of coastlines is related to natural factors such as waves, tides, changes in ocean currents, and sea level rise, and another reason is with regard to artificial factors such as man-made structures in coastal areas. The recent intensification of climate change is accelerating common efforts around the world to cope with the phenomenon of beach regression. Korea designates Coastal Erosion Management Zones under the 'Coast Management Act' to mitigate its coastal erosion. France, on the other hand, enacted the 2021 Climate Act that promotes adaptation to territory due to beach regression, while gradually limiting development activities at the urban planning level according to the proximity of the coastline through Loi Littoral (The French Coastal Law). This paper reviews the coastal erosion management legislation of both countries, derives implications for legislation in Korea based on an assessment ofFrench legislation, and presents an improvement plan.

• Science of Emotion and Sensibility
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• v.22 no.3
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• pp.35-46
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• 2019

Artificial intelligence (AI) technology has been evolving to recognize and learn the languages, voice tones, and facial expressions of users so that they can respond to users' emotions in various contexts. Many AI-based services of particular importance in communications with users provide emotional interaction. However, research on nonverbal interaction as a means of expressing emotion in the AI system is still insufficient. We studied the effect of lighting on users' emotional interaction with an AI device, focusing on color and flickering motion. The AI device used in this study expresses emotions with six colors of light (red, yellow, green, blue, purple, and white) and with a three-level flickering effect (high, middle, and low velocity). We studied the responses of 50 men and women in their 20s and 30s to the emotions expressed by the light colors and flickering effects of the AI device. We found that each light color represented an emotion that was largely similar to the user's emotional image shown in a previous color-sensibility study. The rate of flickering of the lights produced changes in emotional arousal and balance. The change in arousal patterns produced similar intensities of all colors. On the other hand, changes in balance patterns were somewhat related to the emotional image in the previous color-sensibility study, but the colors were different. As AI systems and devices are becoming more diverse, our findings are expected to contribute to designing the users emotional with AI devices through lighting.

• Korean journal of applied entomology
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• v.47 no.1
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• pp.95-100
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• 2008

We compared colony development and survival rate after artificial hibernation between the bumblebees, Bombus terrestris, produced from domestic and foreign companies. The number of worker and queen produced from foundation colony of three domestic and one foreign companies was 232.4-270.8 and 62.0-181.8, respectively, but there was no statistical difference. In colony development of B. terrestris queens which were terminated diapause by $CO_2$ narcosis at different companies, oviposition rate, colony foundation and progeny-queen production of bumblebees produced from domestic companies were superior to those from foreign company. But foreign company in the number of worker and queen was superior to domestic companies. On the other hand, survival rate and colony development of B. terrestris queens, which were terminated diapause by artificial hibernation at three domestic and two foreign companies, were no significant differences. These results indicate that oviposition, colony foundation, progeny-queen production, and survival rate after artificial hibernation showed no differences between the bumblebees produced from domestic and foreign companies.

• Journal of the Korea Institute of Building Construction
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• v.18 no.5
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• pp.447-453
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• 2018

Since 1960, Korea the town center was developed intensively due to rapid industrial development. As a result of the development, the population was concentrated in urban areas and the green area was decreased. Due to the decrease of the green area, the circulation system of the rainwater was changed, hence the rainwater was not introduced into the groundwater., On the other hand, the water on the surface of the road was changed into the water for flowing to the river and evaporation. The changes in the water flow cause many problems, and the depletion of the groundwater does not create an environment in which microorganisms and plants can live. in Korea, permeable pavement construction is increased to solve these problems, but existing pavement blocks have many problems. The pores of the permeable block are clogged due to the accumulation of dust or whitening phenomenon, and the permeability is lost. In this study, the solution of the problems of existing permeable block were suggested by using polymer and artificial permeable pipe, and strength, permeability and service life are increased, The relationship between the substitution rate of the polymer and the mixing ratio of the artificial permeable pipe was analyzed.