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Prediction of Wave Breaking Using Machine Learning Open Source Platform (머신러닝 오픈소스 플랫폼을 활용한 쇄파 예측)

  • Lee, Kwang-Ho;Kim, Tag-Gyeom;Kim, Do-Sam
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.32 no.4
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    • pp.262-272
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    • 2020
  • A large number of studies on wave breaking have been carried out, and many experimental data have been documented. Moreover, on the basis of various experimental data set, many empirical or semi-empirical formulas based primarily on regression analysis have been proposed to quantitatively estimate wave breaking for engineering applications. However, wave breaking has an inherent variability, which imply that a linear statistical approach such as linear regression analysis might be inadequate. This study presents an alternative nonlinear method using an neural network, one of the machine learning methods, to estimate breaking wave height and breaking depth. The neural network is modeled using Tensorflow, a machine learning open source platform distributed by Google. The neural network is trained by randomly selecting the collected experimental data, and the trained neural network is evaluated using data not used for learning process. The results for wave breaking height and depth predicted by fully trained neural network are more accurate than those obtained by existing empirical formulas. These results show that neural network is an useful tool for the prediction of wave breaking.

A Comparative Study on the Perception and Consumption Behaviors of Korean, Chinese, and US Consumers for Energy bars (한국, 중국, 미국 소비자들의 에너지 바에 대한 인식 및 소비 행동 비교 연구)

  • Oh, Ji Eun;Yoon, Hei-Ryeo
    • Journal of the Korean Society of Food Culture
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    • v.35 no.4
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    • pp.333-341
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    • 2020
  • This study evaluated the perception, consumption behavior, and optional attributes of Korean, Chinese, and U.S. consumers of energy bar products. Data were compared and analyzed by surveying 300 consumers in each country. Significant differences were observed in preference for energy bars according to their nationality, in the order China, the U.S., and Korea. Perception of taste, types and dietary suitability of the products ranked lower for Korean consumers, as compared to consumers of the United States and China. The order dietary fiber, protein, and calcium were the sought-after nutritional requirements of the products. The demand for protein was significantly higher in the U.S. Calcium demand was low in the United States and China, but was very high in Korea, which could be attributed to the low calcium intake of Koreans. Other optional attributes which were closely associated with the purchase and re-purchase decision, included price, taste and delivery period. All three factors were recognized as important options in Korea, whereas awareness of packaging/appearance and brand was not. The taste, nutrients and price in the U.S. ranked high as important optional attributes, while the packaging, external and expiration dates were recognized as low. Unlike Korea and the U.S., important optional attributes for Chinese consumers were determined in the order expiration date, taste, and nutrients, and showed low perception for packaging, appearance, weight, counts, and prices. Evaluating the preference for the main and secondary ingredients, Koreans preferred nuts over grains, Americans preferred dried fruits over nuts, and Chinese preferred nuts and grains; both Korean and American consumers had low preference for dried vegetables. The preference for chocolate was low in Korea and China, whereas preference for jelly was high in China as compared to Korea and the U.S. The intention of purchasing energy bars was significantly lower in Korea than in the U.S. and China. A variety of nutritious functional bars have recently been distributed and sold in Korea, but they are mostly produced in the U.S., which is the largest producer and consumer worldwide. Taken together, results of this study indicate that the demand for nutritional enhancement and preferred materials vary according to the nationality. Hence, it is necessary to develop products that reflect these criteria. Further research is required to analyze the relationship between preference and consumption behavior for each material product developed in the future.

Development of Environment Friendly Permeable Concrete Bio Blocks (친환경 투수 콘크리트 바이오 블록의 개발)

  • Song, Hyeon-Woo;Lee, Joong-Woo;Kwon, Seong-min;Lee, Tae-Hyeong;Oh, Hyeong-Tak
    • Journal of Navigation and Port Research
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    • v.44 no.4
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    • pp.305-311
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    • 2020
  • Rising sea levels along the coast from global warming causes the increase of wave energy along the coast. This rise in sea levels results in relatively deep water levels, which would incur the loss of sand that had not occurred in the past from erosion in coastal areas. Generally, it has been challenging to protect against coastal erosion, and the slope, cross-sectional shape, and materials are selected for the site conditions depending on the change in external forces. However, the application of counter measures based on insufficient understanding of the phenomenon is causing various damage, indicating the need for technological development and converging technologies to improve credibility. In this study, we developed eco-friendly permeable biopolymer concrete blocks to control the coastal erosion by using the Bio-Coast, an effective porous structure that mitigates the destructive erosion caused by the rising sea levels. The hexagonal design of Bio-Coast was derived from the honeycomb, columnar joints, and clover, which are durable and stable structures in nature, and the design was changed to apply bumps on the Bio-Coast filling in the form of a clover to reduce wave overtopping and run-up. Applying the field condition of beaches on the east coast of Korea, the block weight and size were decided and the prototype blocks were manufactured and are ready for field placement. In particular, it is intended to protect coastal areas from destructive erosion by natural and artificial external forces, and to extend the design to river,s lakes, and natural walking trails, to improve the efficiency of quality control and process control through the use of blocks.

The Relationship among Life-satisfaction, Self-neglect, Psychological Well-Being of the Elderly (노인의 생활만족도, 자기방임, 심리적 행복감에 관한 연구)

  • Ahn, Seong Ah;Jung, Eun Young;Kong, Jeong Hyeon
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.3
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    • pp.253-260
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    • 2020
  • The purpose of this study is to verify the relationship between the elderly's life satisfaction, self-neglect, and psychological well-being and to provide the basis for the development of mediation program to improve the psychological well-being of the elderly. The subjects of this study were 143 elderly persons who living in J city of G province. For data analysis, SPSS WIn 21.0 program was used to calculate real numbers, percentages, the mean values, and standard deviation values, and to conduct t-test, ANOVA, Pearson correlation, and multiple regression analysis. The subjects' psychological well-being was analyzed according to their general characteristics. As a result, their subjective well-being had a positive correlation with their life satisfaction (r=.841, p<.001), and had a negative correlation with their self-neglect (r=-.501, p<.001). As a result of stepwise regression analysis, the factors affecting the psychological well-being of the elderly were life satisfaction (β=.787, p<.001), income source (β=-.114, p=.028), and the explanatory power of these variables was 71.3%. In order to improve the psychological well-being of the elderly through the results of this study, it is necessary to prepare various social systems suitable for the characteristics of the elderly.

The Control System of a Medical Robot Bed for Prevention and Healing of Pressure Ulcer (욕창 예방 및 치유를 위한 의료용 로봇 침대 제어 시스템)

  • Lee, Youngdae;Kim, Changyoung;Chang, Changjun;Kim, Jung Ae;Lim, Jae-Young
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.3
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    • pp.353-359
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    • 2020
  • In this study, the controller structure and control algorithm of medical robot bed developed for pressure ulcer prevention and healing are described. The existing pressure ulcer prevention mattress is operated manually and the remaining maximum body pressure exceeds the pressure of ulcer generation, so there is always room for pressure ulcers. However, the system developed in this study does not generate the pressure ulcers because the body pressure drops to zero when the keyboard of the bed descends using the active electric driving keyboard. In addition, even if the bed is raised and the pressure above the critical body ulcer pressure is abnormal, the device and the control algorithm are designed so that the lasting time is within the pressure ulcer generation critical time and the pressure ulcer itself is not generated. The bed key board motor is a motor designed with the BLDC servos suitable for medical use and these can communicate each other easily through CAN(Car Area Network). The system is new medical robot bed that is effective in preventing pressure ulcers and will be distributed to many patients suffering from pressure ulcers.

Elementary school children with mother's perception and policy demands for after school care classes (초등학생 자녀를 둔 어머니의 방과 후 돌봄 교실에 대한 인식과 정책적 요구)

  • Lee, Jae-Hee;Kim, Dae-Wook
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.3
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    • pp.293-300
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    • 2020
  • This study aims to investigate the awareness and policy demands of after school care classes of mothers with elementary school children. The participants of study were 25 mothers with elementary school children in Seoul, Gyeonggi, Incheon, Gangwon. Data collection was conducted from June 23, 2017 to July 18, 2017 by focus group interview. Through the data analysis, the results of the study were analyzed as 'the reality of the after school care class that the mother sees' and 'the policy demands of the mother's after school care class'. 'The reality of the after school care class that the mother sees' is 'the overall level of after school care class is low', 'the probability of selecting the same as a lottery', 'the quality of education that varies depending on the level of the teacher', 'for the child attending the care class negative awareness'. 'Mother's policy demands for after school care classes' are presented as 'positioning as a substitute for thinking and caring', 'improvement of separation between parents' expectations', 'expansion of care recipients', 'request for resilient management'. As the conclusion of this study, first, after school care classes need to focus on the care function. Second, it is necessary to operate after school care classes by level. Third, the realistic needs of mothers should be reflected so that after school care classes can be positioned as alternatives to private education.

The Aesthetic Values of Chinese poetry written by this time of the 21st Century - Aesthetic boundary of Geasan Kwon Seung Geun Chinese poetry literature - (21세기, 이 시대인(時代人)이 짓는 한시의 미학적 가치 - 계산(溪山) 권승근(權丞根) 한시문학(漢詩文學)의 심미경계(審美境界))

  • Kwon, Yun Heee
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.3
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    • pp.193-204
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    • 2020
  • According to science technology development, information society has progressed rapidly in the 21st century. Our consciousness and tradition have become entangled in the tide of Westernization. Therefore, the education of Chinese characters was neglected, and Chinese poetry literature was naturally neglected. This led to the abundance of material civilization, however, from the mental aspects, the daily life of modern people became insecure. There is a poet who has lived a lonely life of creation of Chinese poetry in this era. He is a Geasan Kwon Seung Geun(1940~) who writes only poem while being friends with nature. His Chinese poems were revealed through life experiences in nature, which is inspiring sympathy. The origin of his theme is nature. The poetry obtained from nature is rustic simple and pure. Therefore His poems have the style and taste of nature. The Chinese poetry literature of Geasan has been embodied the elements of self-interest, self-satisfaction, self-contentment and living in free at his literatue. On its basis, his Chinese literature has aesthetic boundary of remaining aloofness(自然而然的 超然)·rambling talk, living peacfully and play around with leisure·(閒遠物遊的 閑淡)·deviation rhyme of vividly and beautifully(生趣淸遠的 逸韻) The aesthetic boundary of Chinese poetry of Geasan can be seen as having a depth. This is the aesthetic boundary of Chinese poetry written by this generation in the 21st century.

A Study on effect of Craft Activities Experience Factor to Self-esteem and Social-support for middle-aged women (공예활동 체험요소가 중년여성의 자아존중감과 사회적 지지에 미치는 영향연구)

  • Hong, Myung Sook;Nam, Sang Moon
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.3
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    • pp.67-74
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    • 2020
  • Middle-aged women experience physical and mental changes along with the loss of femininity, and they feel psychologically empty according as their child's growth and independence reduces the role of care and parenting. These women understand the sense of loss and emptiness caused of their role reduction as an opportunity to maintain their values and beliefs for their leisure life. Accordingly, middle-aged women overcome negative emotions facing in the middle-aged such as depression or empty mind, and establish self-esteem and social support in recognizing it as an opportunity for building relationship and self-realization in social relations, which come through human to human communication by doing craft activities. In this study, in order to analyze the effect of the experience factor of craft activity to self-esteem and social support for middle-aged women, we set up a research model with the experience factor of craft activity as an independent variable and self-esteem and social support as dependent variables. As a result of the study, educational experiences, recreational experiences, and deviant experiences had a meaningful effect on self-esteem, but aesthetic experiences did not have meaningful effect. And, recreational experiences and aesthetic experiences had a meaningful effect on social support, but educational experiences and deviant experiences did not have meaningful effect on social support. Therefore, the institutional system for craft experiences, that can provide content of environmental characteristics for aesthetic factor and visual elements are required. It influences to the change of senses and emotions of middle-aged women. Also, there are limitations that this study did not consider factors of ultimate life changes through craft activities. Thus this study suggests development of new model for variables of wellbeing-related matters.

Creating Cultural Consumer Value in Corporate Culture Marketing. -Focused on Cultural Space 'SpigenHall' and Opera , Apple Steve Jobs' 10th Anniversary Memorial Study- (기업 문화마케팅의 문화소비자 가치 창출 -융복합문화공간 '슈피겐홀'과 오페라 <스티브 잡스의 혁명>을 중심으로, 애플 스티브 잡스의 10주년 추모 연구-)

  • Oh, Se Jong
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.3
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    • pp.111-116
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    • 2020
  • This is a case study of corporate culture marketing to commemorate the 10th anniversary of the death of Steve Jobs on October 5, 2021. Corporate culture marketing seeks to derive cultural consumer values through Steve Jobs' fandom, and to increase corporate brand image and achieve profits. According to Big Data, Steve Jobs' brand image was derived from 'Innovation', 'First', 'Creativity', 'Change', and 'Design'. So, the relationship between Spigen convergence culture space 'SpigenHall', which is highly related to Steve Jobs' brand image, and the opera , which is made of the material of former Apple CEO Steve Jobs, is analyzed with big data and culture. We investigated the opinions of content experts. SpigenKorea and the digital opera are designed to provide Steve Jobs' story of joy and sorrow, offer VIP members' premium services, press publicity is 'the first in Korea', GangNam's suitable for famous celebrity performance venues and cultural and artistic venues 'SpigenHall', the revenue of the performance ticket was selected as a donation. This study is suitable for researching the life story of male CEOs and planning a cultural city. The limitations of the study need to analyze various works by genre and attempt to analyze consumer values according to the industry.

The Effect Dementia Knowledge and Attitude on Dementia Preventive Behavior of Adults (중년기 성인의 치매에 대한 지식과 태도가 치매예방행위에 미치는 영향 요인)

  • Kim, Young Hee;Kwon, Young Chae
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.3
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    • pp.9-17
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    • 2020
  • This study is a narrative research study to investigate the knowledge, attitudes and preventive behaviors of middle-aged adults with dementia and to identify related factors. The study subjects were a total of 230 middle-aged adults living in K and P cities, and data were collected from March 2018 to July 2019 using a structured questionnaire. Collected data were analyzed by descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient, and multiple linear regression analysis using SPSS / WIN 23.0 program. As a result of the study, the knowledge of dementia was 9.97 out of 15, the attitude of dementia was 47.45 out of 60, and the prevention of dementia was 27.75 out of 36. Knowledge of dementia had a positive correlation with dementia attitude (r=.122, p=.050) and dementia prevention behavior (r=.122, p<.05). Factors affecting dementia prevention behavior include marital status (β=.129, p<.05), education level (β=.219, p<.000), and type of disease (β=-.108, p<.000), presence of religion (β =-. 219, p <.000), interest in dementia (β=.237, p<.000), presence of drinking (β=.317, p<.000), smokingPresence or absence (β=.235, p<.000) and knowledge of dementia β=.316, p<.000) were found to have a significant effect. Therefore, in order to improve dementia prevention behavior of middle-aged adults, it is necessary to develop customized education programs for middle-aged adults to practice knowledge of dementia, positive attitudes, and good lifestyle.