• Journal of the Korean Magnetics Society
• /
• v.22 no.4
• /
• pp.142-146
• /
• 2012

Records regarding to magnetism in the written Korean history were surveyed. In this article, we depicted how the magnetism (magnet) was understood by the public in the past in the Korea. The records about magnetism could be chronically categorized into three eras; 1) an era of recognizing a magnetic characteristics, 2) era of recognizing a magnetic pole, and 3) era of acquiring a modern knowledge. The written history of the Silla dynasty (BC57-AD935) revealed that a magnet was produced in this era. However, no record about magnet was found in the written history of the Goryo dynasty (918-1392). It was revealed that throughout the Korean history the interest in the magnetism (magnet) was emphasized most in the Josun dynasty (1392-1910). The magnetism (magnet) was most widely exploited in a geomancy. A magnetic compass was used widely to find a merciful direction and place in everyday life. In the era of Josun dynasty, a magnet was exploited as a magnetic compass for a navigation over the sea. An interesting usage of the magnet in the Josun dynasty was found in the pharmaceutical purpose.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
• /
• v.15 no.1
• /
• pp.10-15
• /
• 2004

Background and Objective : Voice disorders are one of the major occupational hazards of school teaching. Prolonged voice use through verbal instruction has been implicated as a cause of vocal impairment among members of this profession. They all depend on their voice for their livelihood and are greatly alarmed by slightest alteration in voice quality. Despite considerable research in the area of voice problems in teachers, the prevalence of voice disorders in this group is unknown. Severe voice problems can affect teacher's ability to teach in the classroom. Materials and Method : This study investigated the prevalence of self-reported voice problems in teachers using a survey of a simple random sample of middle school teachers (n=1000). As part of the survey, teachers were asked to report voice problems for the day of the survey, duration, main symptom, smoking, caffeine, alcohol history etc. Results : The reponse rate was 91%(n=94) with 89.7%(n=812) teachers reporting voice problems on the day of the survey, and 40%(n=330) of these group reporting the history of medical consult. Conclusion : These finding indicate a need for vocal hygiene education in teachers and for the development of educational programs aimed at preventing voice problems in this group of professional voice users.

• The Journal of Korean Medical History
• /
• v.18 no.1
• /
• pp.89-101
• /
• 2005

Obejectives : This survey was accomplished to find out how Korean medical doctors think that the recognition regarding the Korean acupuncture method and research direction Methods : The survey questions were developed by the consensus from the professors who major in acupuncture and moxibustion. The questionnaire was given the 2731 Korean medical doctors at the mending education site; In addition, it was given to 793 doctors working at the 105 Korean medical hospitals listed on the National Korean Medical Hospital Associations Address book by postal mail; and also it was given to the 142 public health care Korean medical doctors who attended the conference for the municipal and provincial representatives of the public health service Korean medical doctors. Total of 1277 questionnaires were retrieved out of the 3666 subjects. Results : 1. Eleven hundred eighth seven out of 1277 Korean medical doctors think motion and bone and joint disease which has an effect in acupuncture treatment(92.9%) 2. Nine hundred fourteen out of 1277 Korean medical doctors used "Body acupuncture method"(71.5%) and 902 out of 1277 Korean medical doctors think of the korean acupuncture method which is "Sa Am acupuncture method"(70.6%) 3. Eight hundred forty out of 1277 Korean medical doctors want verification which leads a clinical research to know that acupuncturist have acupuncture and moxibustion treatment(65.7%). Conclusion : Korean medical doctors think motion and bone and joint disease which has an effect in acupuncture treatment Korean medical doctors most used "Body acupuncture method" but think of the korean acupuncture method which is "Sa Am acupuncture method". Korean medical doctors want verification which leads a clinical research to know that acupuncturist have acupuncture and moxibustion treatment.

• Journal of Korean society of Dental Hygiene
• /
• v.19 no.1
• /
• pp.117-129
• /
• 2019

Objectives: The purpose of this study was to investigate the influence of demographic characteristics and oral health status on unmet dental needs among preschool children and to provide a basis for improvement of the dental care equality and accessibility using data from the $6^{th}$ National Health and Nutrition Survey. Methods: This study was performed using data collected from the $6^{th}$ National Health and Nutrition Survey. The subjects were 1,472 out of 22,940 people, who participated in the survey and under went oral examination. IBM SPSS Statistics (Version 20.0) was used for statistical analyses based on the complex sampling design. Frequency analysis was performed to determine the distribution of unmet dental needs according to the characteristics of the subjects. The Rao-Scott ${\chi}^2$ test was performed to examine the relationship of unmet dental needs with general characteristics and health- and oral health-related variables. Relevant factors were determined using binary logistic regression analysis. Results: The factors that had statistically significant relations with unmet dental needs included age, medical insurance, household income, limited physical activity, history of dental caries in deciduous teeth, and subjective health status. Logistic regression analysis of complex samples was conducted to determine factors related to unmet dental needs. The results of analysis showed that limited physical activity and history of dental caries in deciduous teeth were related to unmet dental needs. Conclusions: The results show the factors affecting, and the reasons for, the unmet dental needs of preschool children. Future studies are needed to develop national projects and oral health education reforms to address inequalities in preschool children's dental care.

• Journal for History of Mathematics
• /
• v.28 no.2
• /
• pp.85-102
• /
• 2015

Elliptic curves are a common theme among various fields of mathematics, such as number theory, algebraic geometry, complex analysis, cryptography, and mathematical physics. In the history of elliptic curves, we can find number theoretic problems on the one hand, and complex function theoretic ones on the other. The elliptic curve theory is a synthesis of those two indeed. As an overview of the history of elliptic curves, we survey the Diophantine equations of 3rd degree and the congruent number problem as some of number theoretic trails of elliptic curves. We discuss elliptic integrals and elliptic functions, from which we get a glimpse of idea where the name 'elliptic curve' came from. We explain how the solution of Diophantine equations of 3rd degree and elliptic functions are related. Finally we outline the BSD conjecture, one of the 7 millennium problems proposed by the Clay Math Institute, as an important problem concerning elliptic curves.

• Communications for Statistical Applications and Methods
• /
• v.18 no.5
• /
• pp.559-570
• /
• 2011

The role of jurisprudence is examined in the early history of probability and statistics. From the mid-17th to the early 18th century, Christiaan Huygens and Jacob Bernoulli used mathematical expectation to solve the problems that originated from games of chance. We demonstrate that their concept of expectation as a fair price for participating in a game came from the legal concept of 'fair trade'. In addition, we consider that the probability that Bernoulli defined in his Ars Conjectandi originated from the legal concept of 'degree of certainty'. After considering some contributions of Laplace and Poisson, we examined the history of census and statistical survey in the early 19th century. Contrary to the history of the 17th and 18th century, statistics influenced society and law in the 19th century.

• The Journal of Korean Medical History
• /
• v.17 no.2
• /
• pp.27-43
• /
• 2004

"Uirimchwaryo(醫林撮要)" is a medical book that takes a model of written in the middle of Chosun dynasty. In the contents side, it seems to unite a korea medicine with the Geum-Won Dynasty(金元時代) in ancient china. we can think much of the value that it combines theory with experience, choosing the merits of "Uibangyuchwi(醫方類聚)" which were the masterpieces of the first half of Chosun Dynasty and it increased a practical use to choose easily prescription in the clinic. This book which was proofread and published by imperial physician Yang Yaesoo(楊禮壽, ? ~ 1597) is not exist. In this condition, existing print type is added by scholars only after "Donguibogam(東醫寶鑑)" was compiled. When the academic conference was held in last year, I introduced a new founded book in japan's possession that printed in Chosun dynasty. Moreover I survey more documents and investigate a few old printed books that are handed down to Chosun and Japan. In addition, I will present that had done interchanges between the ancient nations in par-eastern asia, especially to have done by diplomatic mission. We can evaluate the value and effect of "Uirimchwaryo" in Chosun dynasty of medical history.

• Parasites, Hosts and Diseases
• /
• v.40 no.4
• /
• pp.177-180
• /
• 2002

Gangweon-do is known to be highly endemic area of sparganosis more than other provinces in Korea. A seroepidmiologic examination for the detection of anti-Spirometra erinacei plerocercoid IgG in serum was carried out in normal inhabitants in Hongcheon-gun, Gangweon-do. Sere were tested by enzyme-linked immunosrobent assay (ELISA) for the anti-sparganum antibodies. Positive rate for anti-sparganum antibody in 719 adults was 3.3%. Data of the questionnaire for 24 ELISA positive inhabitants revealed that 20 had a history of eating raw meat of snakes, 24 had a history of eating frogs, and 24 had a history of drinking stream water. Two positive cases had a past history of sparganosis. Two positive cases showed current symptoms of sparganosis. The data revealed that ELISA would be useful to find infected cases among normal inhabitants at sparganosis-endemic areas.

• Korean Journal of Environmental Biology
• /
• v.21 no.2
• /
• pp.126-131
• /
• 2003

Thirty three species in six subfamilies of Staphylinidae are recognized from Ulleung-do through the survey in 2001. Among them, Thirty one species are newly reported from Ulleung-do. Two species, Anotylus lewisius(Sharp) and Megarthrus aino Cuccodoro, are reported for the first time from Korea.

• 한국문화재보존과학회:학술대회논문집
• /
• 2006.04a
• /
• pp.111-117
• /
• 2006