• Korean Journal of Plant Resources
• /
• v.17 no.2
• /
• pp.139-146
• /
• 2004

Kenaf (Hibiscus cannabinus L.), an annual plant of the family Malvaceae, is considered to be the most promising for alternative plants with potential use as a non-wood fiber source. The objectives of this study were to select the optimum seeding date and adaptable cultivar among newly introduced kenaf cultivars (Everglades-41, Tainung-2 and Chingpi-3) in Jeju island, and to clarify the photosynthetic characteristics of those cultivars. Among the three cultivars, the fresh shoot weight per unit area of Chingpi-3 at harvest season showed highest through all seeding dates, that of while Everglades-41 was the lowest. The difference of shoot yield at harvest mainly due to seedling stand rate and plant number per unit area among the cultivars. The Chingpi-3 showed the highest shoot fresh weight in the seeding date of May 11 and decreased trend in the late seeding dates. Net photosynthesis rate was higher on Everglades-41 with entire type leaf than other two cultivars with palmate type leaf. The activity of ribulose-1,5-bisphosphate carboxylase/foxygenase (rubisco) estimated from the A-Ci curve showed highest in Chingpi-3 among three cultivars. These results suggest that Chingpi-3 might be adaptable cultivar with seeding date of around May 10 for kenaf production in Jeiu island.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.20 no.1
• /
• pp.131-143
• /
• 2019

The purpose of this study is to analyze the research trend of the dementia prevention program in the elderly. Between 2000 and 2018, the Korean Research Information Service (Riss), Google Scholar Search, DBpia, Korea Academy of Science Information (Dissemination Prevention), Dementia Prevention Program, Dementia, The purpose of this study was to investigate the dementia prevention program for the elderly. Based on the analysis criteria and methods of the 404 papers, 36 papers were finally selected. The results of this study are as follows: First, as a result of analysis of the basic structure of the research data and program implementation structure, And, when applied quantitative research method, 25 cases showed a much higher tendency. As a result of analyzing trends of the implementation structure of dementia prevention program for the elderly, 11 were the most in the nursing home (elderly welfare hospital), and the proportion of elderly women was higher than that of male elderly. 65 years of age or older. Second, as a result of analyzing the type of intervention program for dementia prevention program, Third, the Korean version of the MMSE-K tool, which measures cognitive function, is the most frequently used dementia prevention program measurement tool and the result of analysis of effectiveness, Significant improvement in cognitive function. The results of this study suggest that the prevention of dementia for the elderly should be avoided from a fragmentary program and improve the cognitive function, mental behavior and lifestyle of the elderly, improve the healthy aging and quality of life, Suggesting that a program is required.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
• /
• v.13 no.4
• /
• pp.303-307
• /
• 2008

We investigated about change of dinoflagellate composition during October 2006 to November 2007 at the Chagwi-Do, west-part of Jeju Island. There were 32 dinoflagellate species in collected samples and 19 species Amphisolenia bidentata, Ceratium gravidum, C. hexacanthum, C. platycorne, C. praelongum, C. ranipes, C. reflexum, C. geniculatum, Dissodinium elegans, D. bicorne, Ornithocercus heteroporus, O. magnificus, O. quadratus, O. splendidus, O. steinii, Protoperidinium excentricum, Pseliodinium vaubanii, Ptychodiscus noctiluca, Pyrocystis hamulus of collected dinoflagellate species were rare and unrecorded species from around the Korean Peninsula. The quantities by month of these tropical oceanic species, Ornithocercus were 28, 22, 0, 3 and $502\;cells/m^3$ in October 2006, February, April, September and November 2007 respectively. The abundance of genus Ornithocercus for whole dinoflagellate species were 8, 3.9, 0, 0.2 and 97.9% respectively. These results suggest that the coast of Korean Peninsula is getting warm by global warming.

• Korean Journal of Environmental Biology
• /
• v.37 no.3
• /
• pp.406-425
• /
• 2019

To observe the seasonal fluctuation of the meiobenthic fauna community around the coastal area of Jeju island, 20 stations were selected and seasonal surveys were conducted. Three-replicate meiobenthic samples were collected from each station in April, July, and November 2017; February, May, August, and November 2018; and February in 2019, in a total of eight months from 2017 to 2019. The total density of meiobenthos at each station ranged from 733 to 2,505 ind. 10 cm^-2. The month in which the highest habitat density appeared in most stations was April 2017 and the month in which the lowest habitat density was seen was February 2019. Nematodes were the most dominant faunal group among the representative 13 meiofaunal groups at all stations. The subdominant groups were benthic harpacticoid copepods and nauplius. The nematode/copepod (N/C) ratio, reflecting the health indices within the ecosystem, varied from 0.02 to 87.40 over the entire season and the average station values ranged from 2.00 to 16.80. The lowest N/C ratio value was found in April 2017 (0.02) and the highest N/C ratio was found at Station 11 in February 2019, which was 87.40, indicating the highest level of pollution. Seasonal and regional meiobenthos community structure similarity was divided into three groups through group analysis and multi-dimensional scaling (MDS) analysis, which showed that the meiobenthos community structure was affected by seasonal variations, rather than by regional differences.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.27 no.1
• /
• pp.41-55
• /
• 1991

A study was done to investigate characteristics of the land and sea breeze over Cheju island on the basis of surface meteorological data collected from 1977 to 1986. The results are summarized as follows: The frequency of the land and sea breze was highest in August followed by September, October, May and November in descending order. This indicates that the frequency of the land and sea breeze is higher in fall than in spring, and lowest in winter. The sea breeze began much earlier than any other regions of Korea all the year round, and it began about 30 minutes earlier and ended one hour later in the northern coast than in the southern coast of Cheju island. Meanwhile, the land breeze began about one hour earlier in the southern coast than in the northern coast and ended almost at the same time in both coasts. The annual mean duration of the sea breeze was about one hour longer in the northern coast than in the southern coast, but the land breeze showed an opposite trend. The duration of the sea breeze was longer in summer than in winter and again the land breeze was opposite. Transition period from the sea to the land breeze was relatively long in summer and shout in winter, but transition period from the land to the sea breeze was not different between seasons. The time for a maximum velocity of the sea breeze came earlier in the southern coast than in the northern coast, but that of the land breeze came almost at the same time in both coasts with no seasonal variations. Monthly mean maximum velocity of the sea breeze was greater than that of the land breeze.

• Korean Journal of Plant Resources
• /
• v.24 no.5
• /
• pp.650-658
• /
• 2011

The 460 collections of 60 crops were collected during 34 days from 28 November to 31 December 2008. The 295 accessions of 43 crops, 49 accessions of 24 crops and 116 accessions of 42 crops were collected in Kangwha, Ulreung and Jeju island in this exploration. Among the total collections, the portion of the food crops, vegetable or ornamental crops and industrial crops were 54.8%, 25.4% and 19.8%, respectively. The farmers conserved 48.4% to 53.6% of the landrace crops for 31 to 50 years. Furthermore, 13.1% to 18.7 % of the collections were cultivated over generation to generation. Most of the crop seeds were conserved by woman farmers aged from 61 to 80 years old. The 82.9% of the seed distributors were also woman farmers, whereas 17.1% was distributed by man farmers.

• The Korean Journal of Pesticide Science
• /
• v.11 no.3
• /
• pp.144-153
• /
• 2007

One of the most recent issues facing the pesticides regulatory process is the assessment of the potential for pesticides to leach through soil and appear in groundwater. Since Jeju island depends on a hydrogeologically vulnerable aquifer system as its principle source of drinking water, it is important to identify which pesticides are the most likely to result in groundwater contamination. The objective of this study was to assess groundwater contamination risk of 21 pesticides (12 insecticides, 6 herbicides and 3 fungicides) in Jeju soils using groundwater ubiquity score (GUS). Considering GUS estimated in 21 representative series of Jeju soils, generally herbicides showed relatively higher leaching potentials and insecticides showed lower leaching potentials. Groundwater contamination risk was higher in the order of bromacil > metolachlor > alachlor > linuron pretilachlor > butachlor for herbicides, carbofuran > ethoprophos > diazinone > dimethoate > penthoate > mecarbam > methidathion > endosulfan > fenitrothion > parathion > chlorpyrifos > terbufos for insecticides, and metalaxyl > chlorothalonil > triadimefon for fungicides. Among the tested pesticides alachlor, metolachlor, bromacil, ethoprophos and carbofuran were classified as the pesticides of very high or high groundwater contamination potential. Although the ranking of the leaching potential was essentially determined on the base of the intrinsic properties of the chemicals and environmental properties, variation of the relative groundwater contamination potentials of each pesticides in different soils were not significant. Therefore, the above ranking of groundwater contamination risk would be applied in most of Jeju soils. To lower the possibility of pesticide contamination of groundwater, the use of those pesticides classified as high or very high leaching potential should be strictly regulated in Jeju Island.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.15 no.10
• /
• pp.6388-6398
• /
• 2014

To understand size fractioned chlorophyll a and material cycle characteristics in Jeju marine ranching area (JMRA), 4 times of survey were conducted from April to November 2008. Picoplankton on the surface in JMRA was on average, $0.30{\mu}g/L$(annual mean(M):17.3%) in the $0.03{\sim}0.84{\mu}g/L$ range, accounting for 17.3%. Nannoplankton and picoplankton was on average, $1.35{\mu}g/L$(M:78.0%) in the $0.22{\sim}3.93{\mu}g/L$ range, and $1.73{\mu}g/L$(M:4.7%) in the nd ~ 0.24 range, respectively. The 10m layer was similar to the surface. The measured values changed according to the measurement times but the nanoplankton composition ratio was higher throughout the year. In addition, the size fractioned chlorophyll a distribution in JMRA was similar to that of tropical sea area affected by the Monsoon rather than South Korean offshore coast geographically adjacent to the East China Sea and Japan coastal waters affected by the Kuroshio/Tsushima warm currents. That is, the material cycle of JMRA consists of a microbial food web rather than traditional food chain at a lower trophic levels. Primary production is deemed to have a higher possibility of being adjusted by top-down dynamics, such as micro-zooplankton grazing pressure rather than nutrients supply.

• Pallet News
• /
• s.40
• /
• pp.4-8
• /
• 2006

동북아 산업표준협력회의(S-Dialogue) 물류분야의 유일한 추진과제로 아시아 파렛트 표준화 과제가 선정된 것은 제2회 동북아산업표준협력회의(2003.10.31 북경)로 합의비망록 제4항에 명기함으로써 한 · 중 · 일 파렛트 표준화 전문가 회의가 구성되어 제1차(2004.9.24 서울), 제2차(2005.6.24 북경) 제3차(2005.11.11 후쿠오카)에 걸쳐 아시아 일관수송용 평파렛트 구격(안) 및 추진주제인 "아시아 파렛트시스템 연맹 규약(안)" 제정을 추진하여 2년여에 걸쳐 많은 어려움이 있었으나 산업자원부의 적극적 지원과 3개국 파렛트 전문가들의 폭 넓은 이해와 협조로 지난 제3차 후쿠오카 회의에서 최종안에 3개국 대표가 서명함으로써 제1단계 작업이 성공리에 완료되어 제2단계 실행단계에 진입함으로써 아시아 통합물류시스템구축에 역사적인 거보를 내딛게 되었다. 그간의 추진경과 및 최종합의 내용, 3개국 정부에 대한 건의, 규격안의 주요골자를 첨부한 보고서로 대신 하고자 한다. 본 보고서는 제4회 동북아 산업표준협력회의(2005.11.24 제주)에서 보고 되고 이 회의 공동합의문 2 · 7항에 명기 하였다.

• Proceedings of the Speleological Society Conference
• /
• 1991.06a
• /
• pp.78-85
• /
• 1991

최근에 전세계에 알려진 사실이지만 제주도에는 세계에서 제일가는 단일용암동굴인 빌레못동굴(11.749m)과 용암동굴시스템인 만장굴시스템(13,268m)등 두 세계의 최고기록이 땅 속 깊이 도사리고 있음이 밝혀졌다. 뿐만 아니라, 석회동굴에 있어서도 그 규모에 있어서는 세계적인 것은 못되나 그 특수성에 있어서는 자랑 할 수 있는 것들이 많다. 그 하나가 동굴 호로 온통 동굴내를 장식하고 있는 선선여량의 호동굴이오, 그러고 기암괴기석으로 이름난 단양고수동굴 등등이다.이와 같은 석회동굴들은 이제곳곳에서 관광동굴로 개발되어 지역주민의 소득증대에 이바지 하고 있는 바 이로 인하여 점차 동굴의 자연환경은 파괴되어가고 있다. 따라서 이들 동굴환경의 보전관리는 당면한 과제로 되고 있다.