• 대한수학회논문집
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• 제16권1호
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• pp.153-161
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• 2001

In the course of working on the preconditioning $C^1$ polynomial spline collocation method, one has to deal with the exponential decay of $C^1$ Lagrange polynomial splines. In this paper we show the exponential decay of $C^1$ Lagrange polynomial splines using the Chebyshev-Gauss points as the local data points.

• 한국환경보건학회지
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• 제45권5호
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• pp.487-496
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• 2019

Objective: The purpose of this study was to create soil contamination maps using QGIS (Quantum Geographic Information System) and suggest selection methods for soil pollution sources for preferential investigation in a soil contamination survey. Method: Data from soil contamination surveys over five years in Gyeonggi-do Province, South Korea (2013-2017) were used for making soil contamination maps and analyzing the density of survey points. By analyzing points exceeding the concern level of soil contamination, soil pollutant sources for priority management were identified and selection methods for preferred survey points were suggested through a study of the model area. Results: A soil contamination survey was conducted at 1,478 points over five years, with the largest number of surveys conducted in industrial complex and factory areas. Soil contamination maps for copper, zinc, nickel, lead, arsenic, fluoride, and total petroleum hydrocarbons were made, and most of the survey points were found to be below concern level 1 for soil contamination. The density of the survey points is similar to that of densely populated areas and factory areas. The analysis results of points exceeding the criteria showed that soil pollutant sources for priority management were areas where ore and scrap metals were used and stored, traffic-related facilities areas, industrial complex and factory areas, and areas associated with waste and recycling. According to the study of the model area, the preferred survey points were traffic-related facilities with 15 years or more since their construction and factories with a score of 10 or more for soil contamination risk. Conclusion: Soil contamination surveys should use GIS for even regional distribution of survey points and for the effective selection of preferred survey points. This study may be used as guidelines to select points for a soil contamination survey.

• 한국안전학회지
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• 제12권3호
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• pp.76-82
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• 1997

Flash points ire used to classify flammable liquids according to their relative flammability. Such a classification is important for the safe handling of flammable liquids which constitute the solvent mixtures. MRSM(modified response surface methodology)-1 and MRSM-2 models we suggested for the prediction of the flash points in the flammable ternary system. By means of this methodology, it is possible to predict the flash points of the flammable mixtures system using computer graphics in the triangular coordinate for the ternary system. The proposed methodology(MRSM) has been tested and compared successfully with previously reported flash points in journal for the ternary system.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제2권2호
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• pp.157-162
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• 1995

Let I be the interval, $S^1$ the circle and let X be a compact metric space. And let $C^{circ}(X,\;X)$ denote the set of continuous maps from X into itself. For any f$f\in\;C\circ(X,\;X),\;let\;P(f),\;R(f),\;\Gamma(f),\;\Lambda(f)\;and\;\Omega(f)$ denote the collection of the periodic points, recurrent points, ${\gamma}-limit{\;}points,{\;}{\omega}-limit$ points and nonwandering points, respectively.(omitted)

• 대한한의학회지
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• 제18권2호
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• pp.199-213
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• 1997

A comparative study of influence by area between acupuncture points on hand of original acupuncture system with those of hand acupuncture system was resulted as followes 1. The influence of acupuncture points on original acupuncture system was different from those on hand acupuncture system by meridian system even though on same area or point but was similar by meridian coordination even though on different area or point. 2. The influence of acupuncture points on hand acupuncture system was almost added by those of coordinated original acupuncture system point on those of hand acupuncture system point. 3. The influence of non coordinated hand acupuncture points with several original acupuncture points was according to those of up or down point on same meridian. 4. Tung;s acupuncture system had no corelationship with other two acupuncture systems, where it has no holistic system on original princeple and Extra-points had also no corelationship, where it has no meridian system.

• 대한수학회보
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• 제61권1호
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• pp.195-205
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• 2024

In this paper, we consider the set of periodic shadowable points for homeomorphisms of a compact metric space, and we prove that this set satisfies some properties such as invariance and being a G_δ set. Then we investigate implication relations related to sets consisting of shadowable points, periodic shadowable points and uniformly expansive points, respectively. Assume that the set of periodic points and the set of periodic shadowable points of a homeomorphism on a compact metric space are dense in X. Then we show that a homeomorphism has the periodic shadowing property if and only if so is the restricted map to the set of periodic shadowable points. We also give some examples related to our results.

• 대한한방체열의학회지
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• 제4권1호
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• pp.45-53
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• 2005

Objectives; Hapkok(L14) and Taechung(Liv3) are acupuncture points located on both sides of each foot and hand of the human body. These two points are called sakwan points. Matching these acupuncture points have a significant reason in points of not only regulating the circulation of Yin-Yang as a source point of each meridian, but also playing a basic role of twelve meridian by controling circulation of ki and blood in the whole body. There are already related documents and studies on stimulating sakwan points. Since those papers mostly studied on either hapkok or taechung, we came to have a doubt of stimulating the two point at the same time when an inbalance of Yin-Yang and ki-blood appears. Accordingly, we got to investigate how thermogram of body changes after applying an acupuncture on sakwan points. Our study is as follows ; Methods; Our study was performed on 30 normal cases(M:F=17:13) with no past history to observe the effects of the acupuncture. We measured temperature of abdomen and the back of both hands by D.I.T.I(Digital Infrared Thermographic Imaging) before and after acupuncture on sakwan points. Results and Conclusion; The thermographic change on abdomen was $0.51{\pm}0.71^{\circ}C$. Temperature of abdomen after acupuncture was higher than before acupuncture with high validity(p <0.01). And the thermographic changes on the back of both hands were right hand $0.54{\pm}1.17^{\circ}C$, left hand $0.56{\pm}1.28^{\circ}C$. Temperature on the back of both hands after acupuncture was higher than before acupuncture, but the difference between them had little validity(p <0.01) In addition, we found that it doesn't necessarily follow that the thermographic changes on abdomen and back of both hands after acupuncture on sakwan points happen concurrently.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제45권6호
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• pp.309-315
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• 2019

Objectives: The aim of this study was to evaluate the validity of the existing classification and difficulty index of impacted mandibular third molars in clinical situations and propose a more practical classification system. Materials and Methods: This study included 204 impacted mandibular third molars in 154 patients; panoramic x-ray images were obtained before tooth extraction. Factors including age, sex, and pattern of impaction were investigated. All impacted third molars were classified and scored for spatial relationship (1-5 points), depth (1-4 points), and ramus relationship (1-3 points). All variables were measured twice by the same observer at a minimum interval of one month. Finally, the difficulty index was defined based on the total points scored as slightly difficult (3-4 points), moderately difficult (5-7 points), very difficult (8-10 points), and extremely difficult (11-12 points). Results: The strength of agreement of the total points scored and difficulty index were 0.855 and 0.746, respectively. Most cases were classified as moderately difficult (73.0%). Although only 13 out of 204 cases (6.4%) were classified as extremely difficult, patients classified as extremely difficult were the oldest (P<0.05). Conclusion: For difficulty classification, the authors propose one more difficult category beyond the existing three-step difficulty index: the clinician should consider the patient's age in the difficulty index evaluation.

• 대한한의학회지
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• 제17권1호
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• pp.84-110
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• 1996

Meridian collateral and meridian points have been the base of acupuncture and moxibustion therapy. Also the theory have composed the main portion of Oriental Medicine. But the mechanism and scientific background has not been completely eatablished, and the research on the objectification of diagnosis of meridian collateral and meridian points, and acupuncture & moxibustion therapy has been necessary nowadays. A new understanding of value of Oriental Medicine has been increasing, the scientific understanding of meridian collateral and meridian points should have been examined. The system of meridian collateral and meridian points was very interesting topics between the scientists in the world. Especially, the elucidation of function and mechanism of Qi(氣) was very important in the scientific theme of 21th century. But there has been many difficulties in the study of meridian collateral and meridian points, since the system of meridian collateral and meridian points has the complexed function and vague structure in the organism. As the one of index of meridian points, the electric current has been used. In this report, the volume of electric current on the skin around the meridian points was investigated. The results of investigation showed the meridian points have higher electric current volume than non-meridian points.

• 한국학교보건학회지
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• 제15권1호
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• pp.141-150
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• 2002

The purpose of this study was to investigate the visual acuity and the degree of vision-related knowledge and behaviors of the 1st and 2nd graders of primary school and their parents in a city. The research design was a descriptive study and the subjects were 579 pupils and their parents in Namwon City, Chonbuk province. Children's vision screening was conducted with Han's test by author, school nurse according to the guidelines. The data were analyzed by frequency, percentage, mean, S.D., t-test, ANOVA, Pearson's correlation coefficient, $x^2$-test with SAS program. Subnormal visual acuity group (SVAG) in children was 17.3%, and was higher in girls and in the 2nd graders, but there were no significant differences statistically. The mean score of the vision-related knowledge in children was 6.8 points out of 10 points and that of vision-related behaviors was 23.5 points out of 33 points. The mean scores of the vision-related knowledge were significantly higher in 2nd graders (p= .02), in girls (p= .02) and SVAG (p= .01) and the group of high scores in vision-related knowledge presented significantly high scores in vision-related behaviors (p= .001). The mean score of the vision-related knowledge in parents was 6.4 points out of 10 points and that of vision-related behaviors was 28.4 points out of 33 points. The group with high scores of vision-related knowledge in parents presented significantly high scores in vision-related behaviors (p= .003). As SVAG were higher in 2nd graders and the group of high scores of vision-related knowledge showed also high scores in vision-related behaviors in both children and their parents, From the above results, the author suggests a school-based visual health program for them.