• Journal of Environmental Science International
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• v.31 no.11
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• pp.941-950
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• 2022

This study was conducted to provide data and stem information to establish a local volume table of Cryptomeria japonica in Jeju Island. Stem analysis was performed on 26 trees by selecting two average trees from each site of the 13 plots of C. japonica stands in 2021 and 2022. During the analysis stage, one outlier tree was rejected, and a total of 260 observations of the specific stem height of 25 trees were used. Of the seven major taper equation models applied for parameter estimation and statistical verification, the Muhairwe 1999 model was found to be the best fit and selected as the optimal model. Stem shape-related estimates were acquired through the selected model, and sectional measurements according to the Smalian formula applied at an interval of 10 cm from the height of the stem were used to develop a volume table. A paired t-test comparison between the C. japonica volume obtained from the present study and those selected from the current yield table by NIFoS(2020), revealed significant differences (p<0.05), highlighting the necessity of a local volume table for C. japonica in Jeju Island.

• Journal of Korean Society of Forest Science
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• v.40 no.1
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• pp.19-24
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• 1978

The study was conducted to find out the relationship between land cost and financial yield earned by the plantations of Pinus koraiensis, Pinus densiflora and Cryptomeria japonica, and to investigate possible land investment for the given rates of return. The result of the study could be summarized as follows: 1. In the case of Pinus koraiensis plantation on site index 12, the finnancial yield was 6.4 percent when the land cost was 0.5 million Won per hectare, but the yield was reduced to 2.1 percent when the cost was 2.5 million Won. It would be therefore necessary for inducing plantation investment to raise financial yield by control of forest land price. 2. The financial yield on land of zero expectation value, in other words, internal rate of return of land investment was estimated at 10 percent. If the opportunity cost of forest land is higher than this, the economic plantation is not visible even though the land is free. 3. With the expected financial yield of 3 percent, the possible land investment of poor sites was estimated at 1.24, 0.28 and 0.80 million Won per hectare for the plantation of Pinus koraiensis, Pinus densiflora and Cryptomeria japonica, respectively. In any case, however, land cost could not be over 3 million Won per hectare. 4. The rate earned from forest land investment was generally less than 10 percent. Therefore, the annual interest rate in forestry could not be higher than this, and hopeful rate is not exceeding 6 percent.

• Journal of Korean Society of Forest Science
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• v.67 no.1
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• pp.31-41
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• 1984

This study was examined for purposes of identifing woods of the hull construction collected from a sunken old-ship by the anatomical wood features, and then from the result the geographical distribution ranges of the species were described. Most woods of the hull construction, i.e. shell plating, bulkhead, floor, bulwark, deck and kneel were identified with Chinese red pine (Pinus massoniana), but the fenders were idendified with Chinese fir (Cunninghamia lanceolata). These two species are known to be the endemic species in the south region of Yangtze River. As the other materials, bulwark stays and liquid tank stays were respectively identified with Cinnamomum spp., Distylium spp., and the geographical distributions of these species are the south China, the south coast of Korea and the Japanese Islands.

• Applied Biological Chemistry
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• v.41 no.2
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• pp.141-146
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• 1998

In order to determine the optimmum harvest time of Citrus unshiu Marc. var. miyagawa and C. unshiu Marc. var. okitsu produced in Cheju, citrus fruits sampled at packing houses or harvested directly on citrus tree in south and north area of Cheju were analyzed. The fruits were grown in size till middle of October, and soluble solids were increased continuously after that. The fruits size were different by positional directions on the tree, the quality of citrus fruits in central southern positions on the tree was good for fresh fruit consumptions. Compared with only the quality of citrus fruits as a factor of soluble solids, total sugar, pH, and color index, the optimum harvest time were supposed to be reasonable at late of November for C. unshiu Marc. var. okitsu, and at early of December for C. unshiu Marc. var. miyagawa. The results obtained from citrus fruits sampled at packing houses were supposed to be not suitable for determing the optimum harvest time, because of storage after harvest at ordinary harvesting time.

• The Korean Journal of Community Living Science
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• v.16 no.4
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• pp.95-102
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• 2005

The present study was performed to investigate the 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical scavenging and Proly1 endopeptidase (PEP) inhibitory activities of plant extracts. The whole extract of Fragaria yezoensis inhibited the DPPH radical by $90.4\%$ and the stem of Gingko biloba, Gardenia jasminoides for. grandiflora and Rhododendron yedoensa var. poukhanene, the loaves of Rhododendron mucronulatum var. ciliatum, Gardenia jasminoides for. grandiflora and Corylus sieboldiana var. mandshurice, the fruit of Cornus officinalis, and the root of Gingko biloba showed high DPPH radical scavenging activities. In the case of PEP inhibitory activities, high inhibition was observed in the whole Plant of Fragaria ananassa, Fragaria yezoensis and Hypericum erectum, the stem of Actinidia arguta and Rhododendron yedoensa var. poukhanese, the leaves of Rhododendron yedoensa var. poukhanense and Rosa davurica, the fruit of Cornus officinalis. and the root of Acer okamotoanum. There was significant correlation (P=0.000) between DPPH radical scavenging and prolyl endopeptidase inhibitory activities, thus some of plant extracts such as whole Fragaria yezoensis, fruit of Cornus officinalis had high activities in both DPPH-scavenging and prolyl endopeptidase inhibition. Therefore, it is required to examine the mechanical interaction between DPPH-scavenging and prolyl endopeptidase inhibitory activities and further studying plant extracts with both these activities is desired to develop agents for preventing and treating of Alzheimer's disease.

• Korean journal of applied entomology
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• v.33 no.2
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• pp.107-113
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• 1994

This study is canled for tanonomical investigation of Olibatid mites on landscape plan& As the results, thirteen species of Oribatid mites on the plants are described for the first time from Korea. but the harmfulness caused by the mites is not yet proved The mites are Tuberemoeus singularis Sellnick, Zygoribatulo elongoto Hammer. Scahperemaeus yamashitoi Aoki, Oribatula sakamori Aoki, Camis~a segnis (Hemann), Scheloribates Jatipes (Koch), Oppiella nova (Oudemans), Lauroppia neerlondica (Oudemans), Hemileius sp.. Oripodo sp., Twncopes sp.. and Tectocehpeus sp. etc. Among them, Tuberemaeus singularis and Zygoribotulo elongatn are recorded from Korea for the first time And three lalvae are found out at intestine of one specimen of Tuberemoeus singularrs Sellnick which is collected on Cryptomerio japonica D, in Chep (Seoguipo). Therefore, thls mite seems to be ovoviviparous.

• Journal of the Korean Wood Science and Technology
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• v.20 no.3
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• pp.21-27
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• 1992

The amount of moisture transmitted under four different humidity conditions was measured in earlywood and latewood for Cryptomeria japonica(LT specimens). The results obtained are summarized as follows. The vapor permeability in eariywood was about three times larger than that of latewood. The vapor permeabilities in earlywood and late wood depended on the average moisture content of the wood. This indicates that moisture transmission is influenced by vapor permeability or vapor-transmission resistance, but the values obtained by experiments do not have great adaptability for practical situations because of changes in the experimental conditions. There fore, it is necessary to know the moisture content along the flow direction in order to explain the moisture transmission of wood. The vapor permeability was calculated using the density in air dried wood. These were then compared with the experimental values. The vapor permeabilities calculated with this density in the radial direction(LR specimen) had a good tendency to agree with the experimental values, but not so in tangential direction(LT specimen).

• Korean Journal of Food Science and Technology
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• v.17 no.4
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• pp.304-310
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• 1985

Sensory comparison of the flavor of ginseng teas prepared from concentrated white or red ginseng extract was investigated by multipl comparison test and quantitative descriptive analysis (QDA) on 12 selected descriptions. The white ginseng tea revealed higher intensities in odor and taste than those of red ginseng tea, particularly on earthy and sweet odor and bitter and astringent taste. Increase in sample temperature from $2^{\circ}C$ to $80^{\circ}C$ caused a general increase in aroma and bitter taste. When sucrose added into 3% ginseng tea solution, all of the taste descriptions, most significantly on bitterness and astringency, scored lower except sweetness while the aroma was affected a little.

• Proceedings of the Korean Society of Environment and Ecology Conference
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• 2007.04a
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• pp.169-175
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• 2007

본 연구는 제주 한남시험림에서 2006년 11월부터 2007년 2월까지 매달 3일 연속으로 선조사법 실시 2개 지역과 정점조사법 실시 2개 지역을 정하여 동계 조류 군집을 조사하였다. 총 32종의 조류를 확인하였으며, 출현빈도 0.50 이상인 조류는 11월 직박구리, 검은머리방울새, 큰부리까마귀, 곤줄박이, 멧비둘기, 박새였으며, 12월 직박구리, 큰부리까마귀, 검은머리방울새, 곤줄박이, 멧비둘기, 노랑턱멧새, 박새였으며, 1월 직박구리, 큰부리까마귀, 곤줄박이, 멧비둘기, 박새였으며 2월 곤줄박이, 큰부리까마귀, 직박구리, 검은머리방울새, 노랑턱멧새, 박새였다. 박새류 중 곤줄박이, 진박새, 박새 3종만을 확인하였으며, 기존 문헌에 기재된 쇠박새는 확인하지 못하였다. 큰오색딱다구리의 관찰빈도는 평균 0.37로서 육지(mainland)에 비하여 높았으며, 삼나무숲과 활엽수림에서 둥지를 발견할 수 있었다. 향후, 지속가능한 산림경영과 관련하여 큰오색딱다구리를 비롯한 산림성 조류에 대한 지속적 모니터링에 대한 고찰을 하였다.

• The Korean Journal of Mycology
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• v.26 no.3 s.86
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• pp.327-341
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• 1998

The mycoflora of Korea, especially the cercosporoid taxa, have been poorly studied in the past. For this reason, a systematic revision of these taxa has been initiated, with the eventual aim of producing a monograph of the Korean cercosporoid taxa. The present study circumscribes ten species; viz., Cercospora althaeina, C. arachidicola, C. armoraciae, C. carotae, C. ipomoeae, Mycovellosiella ferruginea, Passalora miurae, Pseudocercospora araliae, P. cannabina and P. vitis. Distinguishing morphological characteristics are described and illustrated for each species.