• Korean journal of health promotion
• /
• v.17 no.2
• /
• pp.109-118
• /
• 2017

Background: Abdominal obesity as measured by waist-to-height ratio (WHtR) may have stronger and inverse associations with cardiovascular (CV) health than overall obesity as measured by body mass index (BMI). However, there was some challenges for controversies. We aimed to examine the associations of WHtR and BMI with CV health among Korean children using data of the 2010-2012 Korea National Health and Nutrition Examination Survey. Methods: A cross-sectional study was conducted with the sample of 2,363 children by analyzing by gender and two-age groups (10-12 and 13-18 years). Overall obesity was categorized into 3 groups by BMI percentile: non-overweight (<85), overweight (${\geq}85$), and obesity groups (${\geq}95$). Abdominal obesity was categorized into 2 groups by WHtR: normal (<0.5) and abdominal obesity groups (${\geq}0.5$). The CV health score was defined as a z-score by calculating the sum of 7 CV factors. Results: The overweight/obesity groups had significantly lower CV health scores than the normal group (P<0.05) in boys and girls aged either 10-12 years or 13-18 years after adjusting for covariates. The abdominal obesity group also showed significantly lower CV health scores than the normal group (P<0.05) in all the groups; this significant association remained significant in boys aged 13-18 years even after further adjusting for BMI category (P<0.01). Conclusions: Among boys aged 13-18 years, abdominal obesity as measured by WHtR was significantly and inversely associated with CV health, independent of BMI category. Therefore, it should be considered to assess the level of abdominal obesity as a measure of CV health in late adolescent boys.

• (The)Study of the Eastern Classic
• /
• no.33
• /
• pp.279-304
• /
• 2008

This paper draws out the contents related to "Yuk(易)" Silhak(實學), and discusses the tendency in order to review the ideas shown in Wandang's Seodok(書牘). Also, it studies Taoism expressed in Seodok in terms of figuring out Wandang's Taoism. The features of his thoughts are following. The first one is the use of "Yuk(易)" for Soogichiin(修己治人). What he considered most important was Eumsiknamnyu(飮食男女) linked directly to the people's life. He maintained that a country must be ruled by doing Soogi(修己) with "Yuk(易)" and by making use of "Yuk(易)". The next one is both a view of Gyungsechiyong(經世致用) of Dongseoboolboon(東西不分) and a natural view of Iyonghooseng(利用厚生), standing on Silsagusi(實事求是). He actively accepted new learning and concepts those days, and he asserted that Western techniques should be even imitated for the sake of the nation. Thirdly, his view of Moowi(無爲) and Boolun(不言). He didn't use to do any Jakwi(作爲) of Jeosool(著述). This kind of view seems to save his life and be connected to Yangshin(養身) even though others tried to keep a jealous eye on and entrap him. Last, his concept of Jayeonsooneung(自然順應) and Jayeonhoigui(自然回歸). It is shown through his wish of farm work and his politics, saying that a king ought not to bind the people with faithfulness and propriety, and that he ought to rule the nation with humanity. In sum, Wandang's ideas shown in Seodok can be divided into two streams. One is Boshin(保身) through Moowijayeon(無爲自然), Boolun(不言), and Jayeonhoigui(自然回歸). The other is a pursuit of his studies for the purpose of Dukchi(德治) followed by Soogichiin, Kyongsechiyong, Iyonghooseng, and Injung. Here, since Boshin can be said to be advanced Soogi, and Soogichiin and others are connected directly to people's comfortable life, they can be integrated to Soogiianbaeksung(修己以安百姓). In other words, his thoughts were based on the fusion of Confucianism and Taoism, and he aimed at Soogiianbaeksung by accepting and using to take a look at the change of period and learning.

• (The)Study of the Eastern Classic
• /
• no.54
• /
• pp.289-318
• /
• 2014

The purpose of this study was to compare Gwonbeop motions among "Gihyosinseo", "Mubiji", "Muyejaebobunyuksokjib" and to analysis catalogue of books on Gwonbeop for comprehensive interpretation in "Muyedobotongji". the conclusion through literature review was as follows. First, There were total 16 references which were composed of 14 references of China and 2 references of Korea. In particular there was no reference of Japan for Gwonbeop. In detail, unrepresentative references of China were "Hanseo", "Gihyosinseo", "Mubiji" and unrepresentative reference of Korea was Muyejaebobunyuksokjib". Second, We compared motions of Gwonbeop between China and Korea. There were located 5 motions such as Gyungakguheese(False Prey Posture), Gigose(Flag Beating Posture), Ahnshichukshinse(Goose Wing Posture), Jumjoose(Picking Elbow Posture), Pogase(Throwing Shelf Postere). In other three references unmentioned "Mubiji" there were located 8 motions such as Jungranse(Spring Railing Posture), Gichukgakse(Ghost Kicking and Leg Striking Postere), Jidangse(Open Finger Attacking Posture), Soodoose(Beast Head Shield Posture) Shingwon(Heavenly Fist Posture), Il-jopyunse(Whipping Lunging Posture), Jakjiryongse(Dragon Prey Snatching Posture), Joyangsoose(Slanting Hero Hand Posture), In two references of Korea there were located 2 unique motions such as Nachaluichoolmun Gakabyunhase(Low Encountering Posture), Gumgyedongnipse(Single Leg Throwing Postere). Third, Most of all we found two kinds of unique motions such as Chukcheonse and Eungswaeik on "Muyejaebobunyuksokjib" and such as Nachaluichoolmun Gakabyunhase(Low Encountering Posture), Gumgyedongnipse (Single Leg Throwing Postere) on "Muyedobotongji". Based on chronological table although "Gihyosinseo" is the longest literature, there was begun changing techniques in details on literatures of Korea. Transformed into techniques of Gwonbeop on Korea could be supposed that those skills were reflected in society and culture of the Joseon Dynasty. To sum it up, Gwonbeop of "Muyedobotongji" was written by "Gihyosinseo", "Mubiji", "Muyejaebobunyuksokjib" but most motions of Gwonbeop were begun to change gradually except 5 motions of "Gihyosinseo". Especially, there were 8 unique motions which could not be found in references of China. Those unique motions of Korea literatures were living proof of attempting transfiguration from motions of China. The significance of this study was to be able to put stepping-stone to interpretate history of Taekwondo which takes center stage on bare hands martial arts and analyzed the meaning of historical martial arts on Gwonbeop in Joseon Dynasty.

• Korean Journal of Optics and Photonics
• /
• v.33 no.4
• /
• pp.167-176
• /
• 2022

Adaptive optics (AO) systems compensate for atmospheric disturbance, especially phase distortion, by introducing counter-wavefront deformation calculated from real-time wavefront sensing or prediction. Because AO system implementations are time-consuming and costly, it is highly desirable to estimate the system's performance during the development of the AO system or its parts. Among several techniques, we mostly apply statistical analysis, computational simulation, and optical-bench tests. Statistical analysis estimates performance based on the sum of performance variances due to all design parameters, but ignores any correlation between them. Computational simulation models every part of an adaptive optics system, including atmospheric disturbance and a closed loop between wavefront sensor and deformable mirror, as close as possible to reality, but there are still some differences between simulation models and reality. The optical-bench test implements an almost identical AO system on an optical bench, to confirm the predictions of the previous methods. We are currently developing an AO system for a 1.6-m ground telescope using a deformable mirror that was recently developed in South Korea. This paper reports the results of the statistical analysis and computer simulation for the system's design and confirmation. For the analysis, we apply the Strehl ratio as the performance criterion, and the median seeing conditions at the Bohyun observatory in Korea. The statistical analysis predicts a Strehl ratio of 0.31. The simulation method similarly reports a slightly larger value of 0.32. During the study, the simulation method exhibits run-to-run variation due to the random nature of atmospheric disturbance, which converges when the simulation time is longer than 0.9 seconds, i.e., approximately 240 times the critical time constant of the applied atmospheric disturbance.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.25 no.1
• /
• pp.28-36
• /
• 2023

Solar radiation that is measured at relatively small number of weather stations is one of key inputs to crop models for estimation of crop productivity. Solar radiation products derived from GK-2A and Himawari 8 satellite data have become available, which would allow for preparation of input data to crop models, especially for assessment of crop productivity under an agrivoltaic system where crop and power can be produced at the same time. The objective of this study was to compare the degree of agreement between the solar radiation products obtained from those satellite data. The sub hourly products for solar radiation were collected to prepare their daily summary for the period from May to October in 2020 during which both satellite products for solar radiation were available. Root mean square error (RMSE) and its normalized error (NRMSE) were determined for daily sum of solar radiation. The cumulative values of solar radiation for the study period were also compared to represent the impact of the errors for those products on crop growth simulations. It was found that the data product from the Himawari 8 satellite tended to have smaller values of RMSE and NRMSE than that from the GK-2A satellite. The Himawari 8 satellite product had smaller errors at a large number of weather stations when the cumulative solar radiation was compared with the measurements. This suggests that the use of Himawari 8 satellite products would cause less uncertainty than that of GK2-A products for estimation of crop yield. This merits further studies to apply the Himawari 8 satellites to estimation of solar power generation as well as crop yield under an agrivoltaic system.

• (The) Research of the performance art and culture
• /
• no.39
• /
• pp.669-700
• /
• 2019

Farmers' band music is a religious ritual in Korea. It is a solemn ritual to exhibit the auspicious holiness of the people to the God. Most of the ritual is accomplished by music. The music of the farmers 'band, in this sense, has its meaning as the expression of holiness by sound. In this paper, I will explore the principle to make various rhythms of farmers' band music, especially focusing on the chaegut (lit. "stroke music"). It is very symbolic because the name of the music shows the strokes of the gong, called jing, in a rhythmic phrase. In this sense, the chaegut is man-made music based on the specific principles in accordance with the strokes of the gong. Among many chaegut rhythms, samchae (lit. "three strokes") to chilchae (lit. "seven strokes") are the main rhythms. They were made after the principle of 'forward with drums, backward with gongs' in Five way procession. It the basic principle of military procession from the early Joseon Dynasty. The procession follows with the sound of the drums and gongs. There was always a principle of "five strokes" to control the procession. The "five strokes" became the basis of the making of chaegut rhythms. The rhythms of the samchae to chilchae are based on the rhythm of samchae. The samchae has three gong strokes in a cycle, which exhibits the chaotic moment with the rhythmic noise. The name of the rhythm exhibits the correspondence of the signifiant, that is the name "three strokes" and the signifié, that is the real three strokes of gongs in music. Other four rhythms has made up from the samchae with half cycles are added in accordance with the strokes of the gongs. In this way, the chaegut shows the principle of "five strokes" in the military procession. The rhythm of ochae jilgut is a mixture of ochae (lit. "five strokes") and jilgut (lit. "road music") which is usually performed on the road to a mountain shrine. The musical structure of ochae jilgut corresponds to the colotomic structure of Southeast Asian music and the 15th-century music of old musical scores. The rhythm of gilgunak chilchae is a mixture of gilgunak (lit. "road military music") and chilchae (lit. "seven strokes"). The rhythmic structure is similar to other regional music, sijo ("short song") of the literati music and norae garak (lit. "some melody") of the shaman music. In sum, the chaegut is very artistic music made from the military procession of the Joseon Dynasty. The name of the rhythm corresponds with the strokes of the gong in a cycle. In this way, the chaegut shows the principle of music-making to exhibit the ritual characteristics of the Korean people.

• Journal of Intelligence and Information Systems
• /
• v.28 no.1
• /
• pp.131-154
• /
• 2022

Recently, researches on unstructured data analysis have been actively conducted with the development of information and communication technology. In particular, topic modeling is a representative technique for discovering core topics from massive text data. In the early stages of topic modeling, most studies focused only on topic discovery. As the topic modeling field matured, studies on the change of the topic according to the change of time began to be carried out. Accordingly, interest in dynamic topic modeling that handle changes in keywords constituting the topic is also increasing. Dynamic topic modeling identifies major topics from the data of the initial period and manages the change and flow of topics in a way that utilizes topic information of the previous period to derive further topics in subsequent periods. However, it is very difficult to understand and interpret the results of dynamic topic modeling. The results of traditional dynamic topic modeling simply reveal changes in keywords and their rankings. However, this information is insufficient to represent how the meaning of the topic has changed. Therefore, in this study, we propose a method to visualize topics by period by reflecting the meaning of keywords in each topic. In addition, we propose a method that can intuitively interpret changes in topics and relationships between or among topics. The detailed method of visualizing topics by period is as follows. In the first step, dynamic topic modeling is implemented to derive the top keywords of each period and their weight from text data. In the second step, we derive vectors of top keywords of each topic from the pre-trained word embedding model. Then, we perform dimension reduction for the extracted vectors. Then, we formulate a semantic vector of each topic by calculating weight sum of keywords in each vector using topic weight of each keyword. In the third step, we visualize the semantic vector of each topic using matplotlib, and analyze the relationship between or among the topics based on the visualized result. The change of topic can be interpreted in the following manners. From the result of dynamic topic modeling, we identify rising top 5 keywords and descending top 5 keywords for each period to show the change of the topic. Existing many topic visualization studies usually visualize keywords of each topic, but our approach proposed in this study differs from previous studies in that it attempts to visualize each topic itself. To evaluate the practical applicability of the proposed methodology, we performed an experiment on 1,847 abstracts of artificial intelligence-related papers. The experiment was performed by dividing abstracts of artificial intelligence-related papers into three periods (2016-2017, 2018-2019, 2020-2021). We selected seven topics based on the consistency score, and utilized the pre-trained word embedding model of Word2vec trained with 'Wikipedia', an Internet encyclopedia. Based on the proposed methodology, we generated a semantic vector for each topic. Through this, by reflecting the meaning of keywords, we visualized and interpreted the themes by period. Through these experiments, we confirmed that the rising and descending of the topic weight of a keyword can be usefully used to interpret the semantic change of the corresponding topic and to grasp the relationship among topics. In this study, to overcome the limitations of dynamic topic modeling results, we used word embedding and dimension reduction techniques to visualize topics by era. The results of this study are meaningful in that they broadened the scope of topic understanding through the visualization of dynamic topic modeling results. In addition, the academic contribution can be acknowledged in that it laid the foundation for follow-up studies using various word embeddings and dimensionality reduction techniques to improve the performance of the proposed methodology.

• Journal of Life Science
• /
• v.33 no.7
• /
• pp.565-573
• /
• 2023

In light of the complex interactions between the host animal and its resident gut microbiomes, studies of these microbial communities as a means to improve cattle production are important. This study was conducted to analyze the intestinal microorganisms of Holstein (HT) and Jersey (JS), raised in Korea and to clarify the differences in microbial structures according to cattle species through next-generation sequencing. The alpha-diversity analysis revealed that most species richness and diversity indices were significantly higher in JS than in HT whereas phylogenetic diversity, which is the sum of taxonomic distances, is not significant. Microbial composition analysis showed that the intestinal microbial community structure of the two groups differed. In the both groups, a significant correlation was observed among the distribution of several microbes at the family level. In particular, a highly significant correlation (p<0.0001) among a variety of microbial distributions was found in JS. Beta-diversity analyis was to performed to statistically verify whether a difference exists in the intestinal microbial community structure of the two groups. Principal coordinate analysis and unweighted pair group method with arithmetic mean (UPGMA) clustering analysis showed separation between the HT and JS clusters. Meanwhile, permutational multivariate analysis of variance (PERMANOVA) revealed that their microbial structures are significantly different (p<0.0001). LEfSe biomarker analysis was performed to discover the differenc microbial features between the two groups. We found that several microbes, such as Firmicutes, Bacilli, Moraxellaceae and Pseudomonadales account for most of the difference in intestinal microbial community structure between the two groups.

• Journal of Ethics
• /
• no.88
• /
• pp.103-122
• /
• 2013

This paper aims to study on conceptual suitability or unfitness of Silhak(實學). It is general that by criticizing Chujahak(朱子學) or beyond the limitation of Seonglihak(性理學), Silhak has developed practical tendency to reforming the society in the middle and end of Chosen Dynasty, related to the context of Korean national reflection in modern times. However, it is unfortunate to be understood. As presented in Chosenwangjosillok(『朝鮮王朝實錄』), there has been a few usages in the term 'Silhak'. In short, it was different from its contemporary meaning. At that time, it was usually used to have the meaning of Gyunghak(經學), compared to Sajanghak(詞章學), or rarely, of 'the true study' or 'the practical study'. Therefore, it is to claim that its conception has been manipulated or exaggerated very seriously. Since 1930s, in particular, its conception has been misused in interpreting works of Jung Yak-Yong by some scholars, such as Jung In-Bo, Moon Il-Pyung and An Jae-Hong, who tried to apply the term to overcome the Japanese colonial era symbolised as modernity based on the future life of Korea. Even though their attempt has led to have crucial discussions on the conceptions of Silhak, it has an unnecessary result that there has been a new and totally different understanding of Silhak in South Korea, North Korea, China, Japan, etc., which means that the unsustainable conception of Silhak has been one of major problems in studying of Silhak. To give an practical solution, I would try to make sense of 'time spirit' whose scholars studied Silhak in the middle and end of Chosen Dynasty. A problem, however, is that a scholar group in the name of Bukhakpa(北學派) had certain links and bonds. This is because many scholars studying of Silhak were usually features out of the main stream, which made them it difficult to form any various groups. That is to say, it seems to be natural that they have dreamed of utopian imaginations less than of overlapping points in reality. To sum up, it would be concluded at least that any approach to human lives and thoughts in the given conceptions of Silhak, e.g. ethical thoughts of Silhak, enables us to be indifferentiated to take its true meaning and time spirit of Chosen Dynasty. To be disenchanted of its social roles in Chosen Dynasty, fundamentally, it should be escaped from the wrong net of illusions and sings in understanding Silhak in certain eclectic steps.

• The Journal of Korean Philosophical History
• /
• no.29
• /
• pp.89-123
• /
• 2010

As above, as theoretical basis of critiques against School of Mohism, the researcher summarized the positions of the elder Confucian scholars including Meng Zi. In the body of text, taking it as promises, the researcher examined the critiques against Mo Tzu and School of Mohism as well focusing on the aspects and development of the theory of rejecting heterodoxy which had been introduced and strongly argued from the end of Goryeo kingdom to the late Joseon period. The summary of the body of this text is as follows: In the old literatures prior to Goryeo Kingdom, the researcher couldn't find any cases that either the School of Mohism or Mo Tzu including the Hundred Schools of Thought had been rejected explicitly. Having reached the end of Goryeo and the beginning of Joseon period, Meng Zi's viewpoints on the theory of rejecting heterodoxy had begun to emerge and come into play with the progress of accepting Neo-Confucianism, and, these critiques against Yang Zhu and Mo Tzu being given, the scholar-literati circle had started rejecting Buddhism and Lao Tzu. Basically the contents of the critiques against the School of Mohism in the early period of Joseon were in succession to Meng Zi's theory of rejecting heterodoxy and the views and thoughts of the elder Confucian scholars including Han Yu rather than any specific critiques against Mo Tzu' ideology itself. Until entering the middle of Joseon period, the critiques against the School of Mohism had been used as a tool to promote Confucianism in an affirmative manner, while arguing strongly against the viewpoint of Han Yu in the first place. Particularly, not only the original text of the Mo Tzu's writings were directly quoted, although it was partial, but also the contents of the critiques against the School of Mohism had been developed and stretched to the extent of their entire ideological system. Having approached to the late period of Joseon, the critiques against the School of Mohism had begun to be linked to those critiques against the study of state examination or of sentence patterns including Catholic Church, furthermore the critics raised their harsh tones against the irregularities of the society at large like the issue of corruptions of the government officials of those days instead, although they still had firmly stood on the ground of the theory of rejecting heterodoxy. Those scholars that belonged to the School of Practical Learning, in particular, said in justification of the School of Mohism arguing that the major ideologies of Mo Zi had usefulness in the real world, also they even evaluated that Meng Zi ' critiques against the School of Mohism were immoderate. To sum up, characteristics of scholars in the Joseon period to understand and critique the School of Mohism are that ideologies of Mo Tzu were mostly used as a tool for the sake of critiques against heresies in other sectors of society based mainly on Meng Zi's theory of rejecting heterodoxy, rather than opposing views against the ideologies or philosophies of the School of Mohism itself. Meanwhile, however, on the plus side, the critics praised Mo Tzu's individual efforts in order to put his ideology of peace into practice apart from the ideological system of the School of Mohism. Also, having reached the late period of Joseon, the researcher was able to have discovered the fact that the writings of Mo Tzu had been used as historical materials in order to ascertain historical truths of Confucian Scriptures, rather not having it regarded as an ideology text.