• Journal of Korean Society of Forest Science
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• v.112 no.4
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• pp.515-522
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• 2023

The aim of this study was to quantitatively evaluate a new stem volume table for estimating the growth, carbon storage, and greenhouse gas (GHG) absorption in Cryptomeria japonica and Chamaecyparis obtusa stands and to provide suggestions for improving the domestic GHG inventory. Carbon storage and GHG absorption were estimated using growing stock data obtained from invariable sub-sample plots between the 6^th and 7^th national forest inventories. We assessed changes in growing stock using the parameters employed by Kozak (1988) and Versions 1 and 2 of the stem volume table. Version 2 has new stem tables for 16 species, including Cryptomeria japonica, which were unavailable in Version 1. Version 2 also includes new data for trees with diameters at breast height equal to or greater than 30 cm. We found greater growing stock values using Version 2 than Version 1 for both stands, and the differences were statistically significant (p<0.001). Applying the new stem volume table increased GHG absorption by 22% for the Cryptomeria japonica stand and 13% for the Chamaecyparis obtusa stand. The growing stock estimation method used in this study should therefore be applied to re-estimate GHG absorptions in the forestry sector to produce accurate statistics for the IPCC guidelines.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2004.04a
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• pp.441-447
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• 2004

본 연구는 지도제작 자동화의 효율성을 향상시키기 위하여 자동화율을 높이고, 단순ㆍ명료하며, 기존의 지형도와 최대한 유사한 형태의 지도가 출력되도록 하는 원칙을 가지고 1/5,000 수치지도 Ver2.0을 이용하여 연구하였다. 이를 위해 지도제작에 필요한 정보를 수치지도 Ver2.0에서 획득하고, 기존 지형도 도식규정에서 표현하는 정보와 비교ㆍ분석하여 실무자 및 제작자들과 많은 협의과정을 거친 후, 지도 제작 자동화에 유리하면서 지도의 미적 품질을 유지하는 도식을 고안하였다. 그 결과 지도제작자동화율을 높이고, 사용자들이 최신의 정보를 얻을 수 있도록 하였다.

• The Magazine for Energy Service Companies
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• s.47
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• pp.50-53
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• 2007

• The Magazine for Energy Service Companies
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• s.49
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• pp.45-49
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• 2007

• The Magazine for Energy Service Companies
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• s.45
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• pp.32-35
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• 2007

• TTA Journal
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• s.98
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• pp.76-80
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• 2005

• The Magazine for Energy Service Companies
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• s.48
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• pp.46-52
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• 2007

• The Magazine for Energy Service Companies
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• s.46
• /
• pp.51-53
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• 2007

• Korean Architects
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• s.576
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• pp.181-199
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• 2017

• Journal of Animal Reproduction and Biotechnology
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• v.35 no.2
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• pp.183-189
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• 2020

The pregnancy rate in indigenous ewes inseminated with frozen-thawed Suffolk semen following natural and synchronized estrus was determined. The serum Progesterone and Estrogen concentration and vaginal electrical resistance (VER) of ewes at the time of Artificial Insemination (AI) were observed as successful pregnancy determinants. 21 healthy ewes were selected for this experiment during January-April, 2017. 10 ewes were inseminated in natural estrus. Whereas, 11 ewes were inseminated after estrus synchronization using intravaginal sponges containing 60 mg medroxyprogesterone acetate. Trans-cervical Al (TCAI) was performed in all ewes within 12-16 hours of observed heat. Prostaglandin E₁ analogue impregnated vaginal sponge was used for cervical relaxation 6-8 hours before insemination. Pregnancy was diagnosed through trans-abdominal ultrasonography after 40 days of AI. The pregnancy rate of ewes in synchronized estrus was higher (54.5%) than in natural estrus (30%). Higher serum Progesterone level (0.90 ± 0.02 ng/mL) and significantly (p < 0.001) lower VER (257.78 ± 10.11 ohm) were observed at the time of AI in ewes becoming pregnant. Results suggest that higher Progesterone concentration and lower VER could be considered as pregnancy indicators. Oestrous synchronization could be implemented to increase the pregnancy rate in ewes.