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Seo Jiho,Lee Joon-Soo,Shim Sung-Lye,In Jun-Gyo,Park Chol-Soo,Lee Yong-Jae,Ahn Hee-Jun 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.5
Ginseng ( Panax ginseng ) has been used as a valuable medicinal plant in Asia, and the demand for ginseng production for health functional food is increasing worldwide after the COVID-19 crisis. Although a number of cultivars have been developed to increase ginseng production, none of them were widely cultivated in Korea because they could not resist various environmental stresses while being grown in one place for at least 4 years. To address this, Sunhong was developed as a ginseng cultivar with high yield and multiple stress tolerance by pure line selection. Sunhong showed high yield and heat tolerance comparable to Yunpoong, a representative high-yielding cultivar, and exhibited 1.4 times lower prevalence of rusty roots than Yunpoong, suggesting that Sunhong can keep its high yield and quality during long-term cultivation. In addition, distinct color and lodging resistance were expected to increase the convenience of cultivation. To supply pure seeds to farmers, we also established a reliable high-throughput authentication system for Sunhong and seven ginseng cultivars through genotyping-by-sequencing (GBS) analysis. The GBS approach enabled to identify a suffi cient number of informative SNPs in ginseng, a heterozygous and polyploid species. These results contribute to the improvement of yield, quality, and homogeneity, and therefore promote the ginseng industry.
기후변화에 따른 가지야마 공식 월별 보정계수 개선 및 평가
서지호 ( Seo Jiho ),이동준 ( Lee Dongjun ),이관재 ( Lee Gwanjae ),김종건 ( Kim Jonggun ),김기성 ( Kim Ki-sung ),임경재 ( Lim Kyoung Jae ) 한국농공학회 2018 한국농공학회논문집 Vol.60 No.5
The Kajiyama formula, which is an empirical formula based on the maximum flood data at Korean watersheds, has been widely used for the design of hydraulic structures and management of watersheds. However, this formula was developed based on meteorological data and flow measured during early 1900s so that it could not consider the recently changed rainfall pattern due to climate changes. Moreover, the formula does not provide the monthly coefficients for 5 months including July and August (flood season), which causes the uncertainty to accurately interpret runoff characteristics at a watershed. Thus, the objective of this study is to enhance the monthly coefficients based on the recent meteorological data and flow data expanding the range of rainfall classification. The simulated runoff using the enhanced monthly coefficients showed better performance compared to that using the original coefficients. In addition, we evaluated the applicability of the enhanced monthly coefficient for future runoff prediction. Based on the results of this study, we found that the Kajiyame formula with the enhanced coefficients could be applied for the future prediction. Hence, the Kajiyama formula with enhanced monthly coefficient can be useful to support the policy and plan related to management of watersheds in Korea.
서지호(Jiho Seo),이상수(Sangsu Lee),성낙원(Nakwon Sung) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effects of split injection on the combustion and formations of soot and NOx were investigated with the idealized injection profile and constant volume chamber. The formation of soot is mainly due to the continuous supply of fuel which is too excessive to be burned at a short time. During the dwell of the split injection, the formation of soot stopped and the air around the spray was entrained into the spray plume. The fuel injected after dwell was burned under the leaner condition that soot formation was suppressed. The main mechanism of soot reduction by split injection is the decrease of soot formation rather than the increase of soot oxidation.