• Food Science and Preservation
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• v.1 no.1
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• pp.9-14
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• 1994

Soluble solids($^{\circ}$Brix), acid content and edible part ratio of Citrus unshiu collected at sorting Places in south Cheju area wee more lowered, and peel thickness was more thickened with increasing fruit size. Compared to early variety of Citurs unshiu(C. unshiu Miyakawa Mar), peel thickness of medium variety of Citurs unshiu(C. unshiu Hayashi Mar) was more thickened, and edible part ratio was more lowered with increasing fruit size. Soluble solids of medium variety of Citurs unshiu were lowered, and acid contents were increased compared to early variety. Processing properties for pressing concentrated juice was good for early variety of Citurs unshiu, especially on fruit diameter of 50-65mm. Soluble solids, acid contents and juice ratio were decreased with increasing peel thickness. The quality properties for fresh fruit with peel thickness had a good correlation on early variety of Citurs unshiu, and these data are supposed to be applied to the quality evaluation of Citurs unshiu produced in Cheju.

• Water for future
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• v.17 no.2
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• pp.72-79
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• 1984

This investagation was carried out by analyzing water types and measuring the environmetal isotopes (tritium and deuterium) for development of water resources and protection of ground waters from sea water intrusion. The water sample were taken monthly from April to June, 1983 from sixteen sites in the Cheju metropolitan area; three sea, three spring, and ten ground waters. The ground water in the midwest area of the city contained 20 TU of tritium and-46 per mille of deuterium, classified as the $NaHCO_3$ type of ground water, generally deep seated. The spring water and ground water in the southern part of the city contained 15 to of tritium and-39 per mile of deuterium, and appeared to the $CaHCO_3$ type of shallow ground water, easily affected 표 precipitation. The results of tritium and deuterium analyses showed that the ground water in the coastal area were not affected by sea water intrusion, although they changed from $NaHCO_3$ or $CaHCO_3$ type to NaCl type in May and June. It is concluded that the high Na and Cl content in those ground waters might come from municipal sewage. The sea water in the Yong-duam area was influenced by sping water.

• The Korean Journal of Malacology
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• v.7 no.1
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• pp.58-65
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• 1991

A study on the distribution and community structure of the benthic molluscan shells of the southern coastral area in Cheju Island was carried out from August 1990 to July 1991. The benthic molluscan shells collected and identified from 8 stations were composed of 3 classes, 7 orders, 22 families and 59 species. The number of appearance species from station 1 to station 8 were 22, 35, 32, 26, 28, 24, 32 and 31 species respectively. the first dominant species of the upper intertidal zone of the 8 stations were Nodilittorina exigua, those of the middle zones were Monodonta neritoides from st.1 to St.5, but the second dominant species were not uniftom at ach station.

• Korean Journal of Veterinary Service
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• v.19 no.2
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• pp.180-184
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• 1996

The present study was conducted to investigate for the hematological test and treatment effect of cattle infected with theileriosis in Cheju area. The results were summarized as fellows 1. Symptom of cattle infected with theileriosis were lose of appetite, depression, jaundise, anemia and fever. 2. A postmortem sing of cattle infected with theileriosis were not observed exept for jaundise of subcutaneous, expansion of gallbladder. 3. In the hematological test results of cattle infected with theileriosis supposed lese then killed so far as RBC number of 1, 000, 000/mm and if treated with RBC number of 2, 000, 000/mm cattle was able to recovery 4. In the treatment of cattle infected with theileriosis recovered after 90 days of treatment and the precaution against a shock of blood transfusion were able to the control of injection time and blood qantity.

• Korean Journal of Materials Research
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• v.18 no.3
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• pp.143-147
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• 2008

Fe compounds in scoria as distributed in the south-western area of Jeju Island were investigated using X-ray fluorescence spectroscopy, X-ray diffractometry, and $^{57}Fe$ $M{\ddot{o}}ssbauer$ spectroscopy. The samples were prepared from four parasite volcanoes. It was found that these samples are typical basalt comprised of $SiO_2$, $Al_2O_3$, Fe, and silicate minerals. The $M{\ddot{o}}ssbauer$ spectra showed doublets for olivine, pyroxene, and ilmenite as well as sextets for hematite and magnetite. The valence state of Fe is chiefly a 3+ charge state with a slight 2+ charge state. It is expected that these results will add to the body of information related to the formation mechanisms of Jeju Island.

• Solar Energy
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• v.18 no.4
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• pp.59-66
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• 1998

It was compared with experimental data to verify TRNSYS Model of the thermosyphon hot water system and the various simulations were conducted to optimize the component parameters of the system. To obtain consistent simulation results the system model, which could accurately describ the thermal storage tank temperature stratification and the friction head for mass flow rate, was used. The optimization of collector parameters(collector aspect ratio, riser numbers per header unit length), thermal storage tank parameters(ratio of tank length to tank diameter, heat exchanger type), system parameters(ratio of tank volume to collector area) was simulated by TRNSYS program. The simulation results indicate that the system performance is more effected by collector aspect ratio and the ratio of tank volume to collector area than the othor parameters.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.672-674
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• 2006

Information and communication technology joins in and with development the mobile service pattern which the tourist uses is various and it is changing. Jeiu area is the domestic maximum tourist resort which the annual 5 million visit. The mobile service pattern change from mobile market predition does to be possible. Research analysis against sightseeing industry which is major industry and a mobile service market it led from the research which it sees location base and the mobile fusion technology.

• Korean Journal of Environmental Agriculture
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• v.13 no.1
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• pp.19-30
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• 1994

This study was conducted to investigate the degree of ground water pollution used for drinking water in Cheju Island. Samples were collected monthly from 31 wells of 10 divided areas and were analyzed for $NO_3-N$, pH, $SO_4$, Cl and hardness from 1987 to 1992. $NO_3-N$ concentrations in the samples, with the exception of sample No.23, did not exceed the standard concentration of drinking-water(10mg/l). $NO_3-N$ concentrations at area 10, unpolluted area, ranged from <1.0 mg/l to just over 1.2 mg/l. However, samples from the business district of the area 8 showed the concentrations ranging from 5 mg/l in 1987 to 8.l mg/l in 1992 with a mean of 6.8 mg/l, about 5 times higher than those from the area 10. $NO_3-N$ concentration in sample No. 23 increased from 4 mg/l in 1987 to 12.6 mg/l in 1991. Average rate of increase in $NO_3-N$ in samples of No. 1, 2, 4, and 8 at area 8 was about 1.2mg/l per year in the study period. The ground water at area 1, 2, 3, 4, 5, 6, and 7 showed in the range of pH 7 to 8.1, being similar to area 10. However, pH at area 8 was in the range of 6.6 to 7.3, being lower than that in the other areas. Hardness at area 1, 2, 3, 4, 5, and 6 were in the range of 30 to 80 mg/l, being higher than that at area 10. Those at area 8 were the highest among all the other areas tested. The results of this study suggest that $NO_3-N$ contamination in ground water could be a problem at hotel complexes and business district in Cheju Island.

• Journal of Environmental Impact Assessment
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• v.6 no.2
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• pp.103-112
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• 1997

The object of this study is the introduction and the application of Ecological Footprint(EF) for sustainability of regional people activities. It is a tool for the evaluation of specific projects through various lifestyles or consumption to area of broad policy and budgets. But in Korea there is no assessment for consumption level of human activities by EF. Therefore this study try to analyse ecologically productive land for human activities of Cheju-island in order to assess the sustainability in Cheju and compares with another industrized countries. We analyze the human activities level of Cheju-island then the EF is about 0.9(ha/cap). This value is not more than another countries like Canada and United States. EF assists in choosing technologies, policies and Life Cycle Assessment(LCA) which can perform a certain task with the smallest ecological footprint. It will help society to avoid collapse and move towards sustainability and ecological efficiency.

• Journal of Korean Society of Rural Planning
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• v.12 no.2 s.31
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• pp.27-35
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• 2006

The purpose of this paper is to estimate the economic value of Multi-functionality Roles including landscape and so on, which the stone fences in Jejudo possess, using Dichotomous Choice Contingent Valuation Method(DC-CVM). The stone wall is life cultural heritance of Cheju islanders. It has functions like Development of Favorable Landscapes, Maintenance of Cultural Heritage, and Recreation/Relaxation. Expectation from Cheju visitors shows that the existence and inheritance value of the stone wall is higher then we expected. According to the research that we had done from the people that had agreed to contribute the stone wall, the result was that the public commercial value of Cheju tradition stone will increase every yew(2006: 367 billion won, 2011: 437.1 billion won). Therefore, preserving the stone wall that has Multi-functional Roles and values can lead to huge economic value in the future. But farmhouses in the stone wall conservation area are being supported 6 million won every year. This is only 10% of the income that farmhouse ems per year. Thus, stone wall preservation policy and plan that can raise green-tour commercial value of Cheju Island of long-term inside measurement will have to be propelled continuously.