• Korean Journal of Weed Science
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• v.8 no.3
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• pp.291-294
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• 1988

About 136 weed species belonging to 44 families occurring in summer observed in Cheju island. The Compositae was the most widely occurring family covering 29 weed species, followed by 16 species in Graminae, 14 in Leguminosae, 13 in Rosaceae, 10 in Polygonaceae etc., The dominant weed species detected in range areas of Cheju island were Trifolium repens, Botrychium virginianum, Rosa multiflora, Miscanthus sinensis, Imperata cylindrica. The range areas of Cheju island consisted of the communities of Artemisia princeps-Botrychium virginianum, Artemisia princeps-Erigeron borariensis and Dianthus sinensis, and Artemisia-Lespedeza bicolor and Miscanthus sinensis and then the differential species of their communities were Botrychium virginianum, Erigeron boriensis, and Lespedeza bicolor and Miscanthus sinensis, respectively. The species of the high frequencies occurring in investigated sites were Artemisia princeps, Cirsium rhinoceros, Hydrocotyle ramijlora, Rosa multiflora, Sanguisorba officinalis, Rubus crataegifolius, Potentilla fragariodes, Erigeron annus, Plantago asiatica, Oxalis corniculata, Mosla dianthera in order.

• Journal of the Korean Society for Marine Environment & Energy
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• v.3 no.1
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• pp.52-61
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• 2000

The field surveys and the seawater analyses were conducted over the southern waters of Cheju island every month from July 1997 to June 1988. The distributions of dissolved inorganic nitrogen(DIN), dissolved inorganic phosphorus(DIP), chemical oxygen demand(COD) and dissolved oxygen(DO) in the southern water area of Cheju island were simulated and reproduced by an ecosystem model. In order to estimate the environmental capacity of the southern coastal area of Cheju island, the simulations for predicting the situation of unfavorable environment in which marine water quality might not be satisfied with Korean standards were performed with an ecosystem model by controlling quantitatively the pollution loads of discharge sources including streams flowing into the sea. The more the loads of 4 major pollution sources flowing into model region increase, the more evident appear the increases of COD, DIN and DIP concentrations around the water areas adjacent to pollution sources. In case the pollution loads of all 4 discharge sources including streams become 3 times as high as the present loads, the concentration of DIN at near-shore waters appears to be increased to about 14.5mmol/m³(=0.20mg/ℓ) which is the third class criterion of Korean standards for marine water quality. In case of 10 times as high as the present loads, COD at near-shore waters appears to be increased to about 1.0mg/ℓ which is the first class criterion of Korean standards. In case of 20 times as high as the present loads, DIP at near-shore waters appears to be increased to about 0.50mmol/m³(=0.015mg/ℓ) which is the second class criterion of Korean standards.

• Journal of Korea Water Resources Association
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• v.34 no.6
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• pp.587-596
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• 2001

The purpose of this study is to improve inefficient use of rainwater in island area where it uses rainwater to supply the domestic water and to propose rainwater utilizing system that is most appropriate to the characteristics of precipitation in Korea. To accomplish these purposes, Cheju island was chosen as a study area and the design for the roof area and tank size of rainwater utilizing system was based on the result of the relationship between the actual precipitation and domestic water data which was used in the analysis by run theory to use run theory. Since the result of the analysis indicated that the designed rainwater catchment system was operated stably in Cheju island, the same result is expected in other island too. Therefore, if this system is executed together with the roof rehabilitation work of island area, it will bring positive effects on broth the improvement of residental environment and the security of domestic water.

• Journal of the Korean Society of School Health
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• v.30 no.2
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• pp.154-163
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• 2017

Purpose: This study aimed to understand the current situation of Korean adolescents' sexual experience and its characteristics by school level, gender, and related factors to their sexual experience. This could be the basic evidence for the development of various sex education programs for the youth. Methods: This study used the 11th online survey data on youth health behavior (2015) and all 68,043 students who participated in the study were included for the analysis. The binominal logistic regression model was used to identify the characteristics and relevant factors of sexual intercourse experience. Analysis was performed by complex sample design using SPSS/WIN 18.0. The statistical significance was defined as p<.05 with a two-sided test. Results: The factors related to sexual experience of adolescents included grade, sadness and hopelessness, smoking, Internet addiction, and sex education in school, for middle school boys. For middle school girls, grade, residence area, sadness and hopelessness, smoking, drinking, and sex education in school were related. For high school boys, the factors were grade, living with parents, economic situation, sadness and hopelessness, smoking, drinking, and Internet addiction. For high school girls, grade, sadness and hopelessness, smoking, and drinking were found to be related factors. Conclusion: The results of this study suggest that a practical program considering adolescents' level and characteristics should be developed and applied.

• Journal of the Korean Home Economics Association
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• v.41 no.2
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• pp.13-29
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• 2003

The purpose of this study is to examine consumer characteristics according to analyze the level of consumer knowledge, skill, and consciousness through the comparison between young-elderly people and elderly people in Cheju. For the empirical analysis, the data was collected 428 consumers from May to June, 1999. The statistical methods for this study were descriptive statistics, t-test, ANOVA, correlation using SPSS Win program. The major findings of this study were as follows; 1) The level of consumer consciousness was very high, but the level of consumer knowledge and consumer skill were low. 2) Drug un, Recall system, Frozen-food management, Indication for consumer knowledge; Planning, Discontent treatment for consumer skill; Responsibility for consumer consciousness area were very low state. 3) Correlation according to Pearson's γ²were positive relationship between all of that consumer knowledge and consumer skill and consumer consciousness areas. 4) Sum of 3 findings were no great difference between young-elderly people and elderly people. From now on, some suggestions from this study how to stress on the consumer knowledge and consumer skill as well as consumer consciousness of the elderly in Cheju.

• Research in Community and Public Health Nursing
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• v.19 no.2
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• pp.143-156
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• 2008

Purpose: It is important to identify problems in elders' health through health examination as a part of health service for elders and to execute health education so that elders have appropriate abilities to manage and protect themselves. This study was attempted to assess the need of health education in the elderly and to analyze factors affecting the need of health education. Method: The participants in this study were 354 elderly people living independently in the Jeju Special Self-Governing Province of Korea, and a questionnaire survey was conducted through personal interviews from June 25 to July 26, 2007. The methodology was a descriptive study. Data were collected and analyzed using SPSS Win 12.0. Results: As for the contents of education, elders preferred most the area of 'prevention and management of elderly diseases.' Detailed education contents preferred by elders were the prevention of accidents, diet habits, exercise and weight management, mental health and stress management, complementary and alternative therapies, management of drinking and smoking, etc. Conclusion: According to elders' concerns and needs, systemic health education for the elderly should provide right health knowledge, health maintenance, health promotion and setting of appropriate health education.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.37 no.4
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• pp.335-338
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• 1992

A Cheju-leading mungbean cultivar Seonhwanogdu was seeded at 20, 30, 40, 50 and 60cm row width with within-row plant spacing of 10cm in mid-June of 1988 to 1990 to determine effects of row width on growth and seed yield of mungbean in Cheju area. Initial flowering and maturing dates were not influenced by the row width. Stem length, pods per plant, seeds per pod, 1000-seed weight linearly decreased as row width decreased because planting density increased. The relationship between seed yield and row width was quadratic, and the optimum row width with within-row plant spacing of 10cm for higher yield of mungbean was 40cm in Cheju.

• Korean Journal of Environmental Biology
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• v.24 no.4
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• pp.337-358
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• 2006

The field survey was conducted weekly from April to October in 2004 and 2005 on the sites along the 5.16 road. Sampling sites were made every 100 m height starting from 250 m altitude of both sides of Mt. Halla along 5.16 Road, which crosses the mountain from North to South. Totally 31,698 individuals of 76 species belonged to 25 families were collected. It was July that showed the largest number of species, as 48 species in the northern sloper 42 in the southern slope, and 22 at the highest site (at an altitude of 750 m), while it was April that showed the smallest as 17 species, 15 and 5, respectively. As for monthly fluctuation, the northern slope and the highest site reached their top in August, whereas it was June in the southern slope. In the analyses of similarity (chord distance) of any pair of temporal communities, the closest pair was between June and July in the northern slope area, between July and August in the southern slope and between July and September at the highest site, respectively.

• Proceedings of the KSRS Conference
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• 2004.10a
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• pp.188-191
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• 2004

Appearance and disappearance of the China Coastal Waters(CCW) in the neighbouring sea of Cheju Island was very different yearly but usually appeared strongly in summer. At this time, sea level and salinity were varied in this area by the influence of the CCW. Satellite data(T/P;Topex/Poseidon) and Salinity (NFRID;National Fisheries Research and Development Institute) were used from 1993 to 2001. We compared with TG data of NOR I and TIP data in the observed station(33 31'N, 12632'E). Coefficient of correlation was 0.6~0.8 with the exception of 1993 and 1995. And variations of salinity was higher than $32.00\%_{\circ}$ in the southwestern part of Cheju Island and the southern part of the South Sea of Korea during June-October and SLA(Sea level Anomaly) was 10-11cm. Salinity of the southeastern part was higher than those of the southwestern part and SLA was 12~13cm because of the influence of Tsushima Current.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.9 no.6
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• pp.824-832
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• 1998

The significant additional path loss is caused by scattering, diffraction, and attenuation of propagation. Most of the wave propagation models for rural areas mainly have considered the influence of topography but ignored the effects due to land usage. The goal of this paper is development of the field strength prediction program for Cheju which is used the contour map and the effects due to land usage. In oder to classify the propagation path and divide the environment of land, data of the terrain and the land-cover are formed into a pixel. Two-ray model is transformed into equivalent model by the predicted reflection coefficient and the slope of terrain. For non line of sight, the additional loss is determined by quantitative analysis. The result show good accord and the wave propagation model program can be applied to predicted the service region in rural area of Cheju.