• 한국수산과학회지
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• 제37권2호
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• pp.148-158
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• 2004

In the adjacent seas of Cheju Island, the oceanographic conditions show low salinity surface waters starting in May. This water flows from the southeast part of the China Coastal Water, which flows southeastward along the Great Yangtze Sand Bank until April, with the help of southeasterly winds and flows from the adjacent sea off Cheju Island. In May, the Tsushima Warm Current and the low salinity surface water fluctuate in short and long-term periods as influenced by Yellow Sea Cold Water, which flows to the bottom layer at the western entrance of Cheju Strait. Temperature and salinity fronts in the northeastern sea area of U Island are formed in the boundary area between the Tsushima Warm Current, which expands towards Cheju Island from the southeastern sea area of Cheju Island and Hows out from the eastern entrance of the strait. Seasonally, additional oceanographic conditions, such as coastal counter-currents, which flow southward, appears within limited areas in the adjacent eastern and western seas of Cheju Island.

• 수산해양교육연구
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• 제11권1호
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• pp.59-68
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• 1999

제주도연안 인공어초의 집어효과 향상에 관한 연구를 위하여 인공어초 시설어장에서 패 조류 및 어류의 표본채집과 육안적 관찰 및 삼중자망으로 조사한 결과를 요약하면 다음과 같다. 1. 조사대상 인공어초 시설어장의 패류 출현종은 6종이었고, 서식량은 $490{\sim}3,483g/m^2$ 으로 패류의 위집 효과는 대체로 양호한 상태였다. 2. 조사대상 인공어초 시설어장에 부착하고 있는 해조류는 10종이었고, 부착량은 $3,556{\sim}10,550g/m^2$으로 풍부하게 부착하고 있었다. 3. 조사대상 인공어초 시설어장의 어획량은 천연초 어장에 비하여 3.5~4.4배, 인공어초 비시설 어장에 비하여 10.5~21.4배의 어획효과가 있어서 높은 생산성을 확인할 수가 있었다.

• The Plant Pathology Journal
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• 제16권1호
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• pp.43-47
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• 2000

Citrus tristeza virus (CTV) is the causal agent of one of the most important diseases of citrus. Recently, CTV has been detected in Cheju Island by ELISA. The coat protein (CP) gene of CTV isolated form Cheju Island was cloned by RT-PCR and the nucleotide was analyzed in this study. Citrus leaves were collected from trees showing decline symptoms from various region of Cheju Island in the summer of 1998 and 1999. The CP gene open reading frame is composed of 670 nucleotides and encodes a polypeptide of 223 amono acids. Sequence analysis the CP gene revealed that two CTV strains present in Cheju Island. Viruses collected form Sogwipo area and Cheju City area in 1999 ahowed 91-93% nucleotide sequence homology with CTV T36 strain. Viruses collected form Cheju City area in 1999 and Sogwipo City in 1998 showed 94-98% nucleotide sequence homology with CTV SY568 strain. A efficient viral RNA extraction methods was developed by modifying procedure for animal virus RNA purification methods and PCR product was detected form one tenth of RNA purified from as small as 45 mg fresh or frozen tissue.

• 한국식품저장유통학회지
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• 제4권1호
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• pp.53-59
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• 1997

Physicochemical properties affecting on the quality of Citrus unshiu Marc. var miyagawa and C. unshiu Marc. var, okitsu according to cultivation area in Cheju were investigated. Linear correlations (r>0.9) were showed between fruit size and peel thickness. There were much difference between cultivation areas in soluble solids of C. unshiu Marc. var. okitsu. The difference were not so much in soluble solids and acid contents of citrus fruits produced at same area below 65mm of fruit diameter, but the quality of large size fruits were inferior. Brix/Acid ratio could not be index for quality evaluation, because of individual deviation. Soluble solid content of citrus fruits produced in south Cheju was higher than that produced in north Cheju. Acid content and Brix/Acid ratio of citrus fruits produced in south Cheju was lower than that produced in north Cheju. The quality of C. unshiu Marc. var. miyagawa clad not so much difference between cultivation area, but the difference of quality were recognized significantly in C. unshiu Marc. var. okitsu.

• 한국주거학회논문집
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• 제8권3호
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• pp.81-90
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• 1997

Cheju province exposes a separated residential culture compared to the mainland area. since it has its own unique climate, natural features. Therefore, this study tried to grasp the residential behavior. was based on the questionnaire to Cheju province people, using the approach by statistic verification. This study also focused and aimed on suggesting the basic data about housing plan which is appropriate to the climate. natural features requirement from inhabitants through the comparison and analysis between the mainland area and Cheju province. The results of the study are as follows; Firstly. the diversified applicative study on ‘Ol-rae’. ‘Ma-dang’, ‘Yoo-young’ and so forth that is traditional outside garden of Cheju is imperative, because in urban area people think traffics, vicinity, etc. are more significant, and in rural area people think occupying large outside space is more significant. Secondly. in the study of the degree of satisfaction on the housing, most of the people's was ‘neutral’ and in rural area quite a lot of negative reaction exposed. This is owing to the uniform introduction on residential style of the mainland area. Thirdly, housing plan should be considered family members' housing needs and provincial characteristics, meanwhile most of the people answered positively about the residential value which is considered very significant lately, for instance, security of privacy. appropriate plan for child's room.

• The Korean Journal of Ecology
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• 제14권4호
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• pp.379-398
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• 1991

In order to investigate the ecotypic variations of pulsatilla koreana nakai distributed in korea, 8 local populations of the plant were selected in accordance with latitude and compared on the differences of leaf shape, elongstion, stomatal distribution and dhlorophyll content. The incised angle of the plant is 38。32' in cheju, showing a great difference as compared with 23。77'-30。 32' of the other sites. as to the incised rate, mt. togyu and cheju representsed relatively high values of 49.04% and 48.21% the parted leaved individuals were only observed along the warm current coastal area including cheju, sokcho and sunchon and were 54(62.8%), 2(2.5%) and 3(3.3%) in the sites, respectively. Especially, the individuals consisting of only parted learves were 5(5.8%) in cheju alone and none of the other sites showed such individuals at all. So p. cernua distributed in cheju and p. koreana in inland area can be considered to beecotypic variations of the same species from the upper investigations. According to the elongations of leaf and rachis, the local populations could be classified into 3 types, such as warm current coastal area type(cheju,sunchon and sokcho),southern inland area type(andong, chungju and mt. togyu)and central inland ara type(mt. komdan and hongchon). The dentate numbera of 39.80-43.73 in the warm current area were also different from those of 87% in mt.togyu and 15% in hongchon, while opposite leaflets account for 100% in the other sites. The content of chlorophyll ranged from 0.609 mg/g. d.w.(cheju)to 0.924 mg/g.d.w.(hongchon), showing an increasing trends as the latitudes grow higher. The number of stomata on the low epidermis is much larger than that on the upper epidermis in the whole area. But both aspects showed an increasing tendency, too as the latitude becomes higher.

• 한국환경과학회지
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• 제6권4호
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• pp.303-311
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• 1997

The characteristics of spring machanism In the Cheju Island were analyzed by statistical techniques. Basic characteristics, areal and altitudinal variations, and correlations of spring data were investigated. In this study. however, the subjects of the study are the 451 springs, the whole basin of Cheju Island derided Into four groups. In this study, analyzed the spring phenomena on the basis of both the geologic elements and the topogaphic elements. Also, the spring zone In Cheju Island are classified Into three types that the mountain area, the muddle area, the coastal area in spring distribution by attitude. The quentity of spring and variability show subvariety on the average according to Meinzer's classilfication and the whole basin of spring shows various distributions from Third to Sixth. The results of this study can be utilized to evaluate the condition of groundwater development In Cheju Island.

• 한국대기환경학회지
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• 제15권2호
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• pp.101-111
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• 1999

In previous study, the local trends in dustfall chemistry and deposition were determined and the characteristics of chemical compositions among dustfall, TSP and rainwater were also compared. Based on the previous results, in this study, the effects of sea salts and soil and soil on the chemical composition of dustfall were studied and then the sources of dustfall in Cheju area were tentatively identified by principal component analysis(PCA)

• 한국수산과학회지
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• 제31권3호
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• pp.437-446
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• 1998

제주도 북부연안역의 해황 및 조석전선의 변동특성을 파악하기 위하여 $1991\~1993$년까지 CTD에 의한 해황조사를 실시하고, 조석전선의 위치 Energy를 계산하여 분석하였다. 1 제주도 북부연안역의 국소지역에서는 해협의 중앙부 및 주변해역보다 상대적으로 저온v고염한 해수가 자주 출현하여 주변수 사이에는 국지적 수온 $\cdot$염분전선을 형성하는 경우가 많았다. 이와 같은 현상은 제주도 북부연안역에서의 용승 혹은 조석전선에 의해 발생하는 것이며, 위치는 지형이 다소 돌출된 곳과 수심이나 해저지형이 해$\cdot$조류의 흐름에 영향을 줄 수 있는 곳으로 제주도 서쪽의 차귀도와 비양도 연안, 애월북부 연안역과 제주시 부근 및 함덕 북부해역, 제주도 동쪽의 우도 북부와 행원부근해역에서 자주 출현하고 있다. 2. 제주해협내에는 성질이 서로 다른 이질수괴가 마주치고 있으므로 안장형 (Saddle)의 수온$\cdot$염분분포가 거의 매월 출현하여 안장형의 중앙역이나 이질수괴간의 경계역에서 수온$\cdot$염분전선이 형성된다. 3. 제주도 연안역을 대상으로 계산된 조석전선의 성층계수 (stratification parameter-V ($J/m^3$) )는 6월이 $8.4\~209.8\;J/m^3$의 범위이며, 8월이 $201.9\~634.9\;J/m^3$. 9월 $0.18\~680\;J/m^3$, 10월 $2.7\~462\;J/m^3$의 분포범위로 제주도 북부연안역 약 $1\~2$해리 범위내의 수심변화가 심한 해역에서 위치에너지 10$J/m^3$정도의 등치선이 출현해 조석전선이 형성되고 있으며 이는 대략 50m등심선과 일치했다.

• Journal of the korean society of oceanography
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• 제35권3호
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• pp.129-152
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• 2000

The Cheju Current (CC), defined here as a mean eastward flow in the Cheju Strait, mostly carries water of high temperature and salinity originating from the Kuroshio in winter and spring, the Cheju Warm Current Water (CWCW). The strong core of the eastward component of the CC is found close to Cheju Island (Cheju-Do, hereafter) in winter and spring with a peak speed of about 17.0 cm/s. The eastward flow weakens towards the northern Cheju Strait, and a weak westward flow occurs occasionally close to the southern coast of Korea. The volume transport ranges from 0.37 to 0.45 Sv(1 Sv=10$^6$ m$^3$/s) in winter and spring. Seasonal thermocline and harocline are formed in summer and eroded in November. The occurrence of the CWCW is confined in the southern Cheju Strait close to Cheju-Do below the seasonal thermocline in summer and fall, and cold water occupies the lower layer north of the CWCW which is thought to be brought into the area from the area west of Cheju-Do along with the CWCW. Stratification acts to increase both the speed of the CC with a peak speed of greater than 30 cm/s and the vertical shear of the along-strait currents. The strong core of the CC detached from the coast of Cheju-Do and shifted to the north during the stratified seasons. The volume transport in summer and fall ranges 0.510.66 Sv, which is about 1.5 times larger than that in winter and spring. An annual cycle of the cross-strait sea level difference shows its maximum in summer and fall and minimum in winter and spring, whose tendency is consistent with the annual variability of the CC and its transport estimated from the ADCP measurements. Moored current measurements west of Cheju-Do indicate the clockwise turning of the CC, and the moored current measurements in the Cheju Strait for 1530 days show the low-frequency variability of the along-strait flow with a period of about 37 days.