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송상철,송창길,김주성 한국약용작물학회 2015 한국약용작물학회지 Vol.23 No.1
Characteristic of seed for Sageretia thea fruits collected from the habitat of harvest season in Jeju and theirgermination ratio in different temperatures were considered. The average weight was 0.2 g, average diameter was 7.2 ㎜,average length was 6.5 ㎜, and size distribution range was 5.1 ~ 10.0 mm. The number of seeds per fruit was 1.8, and 1000grain weight was 7.77 g with diameter of 3.7 ㎜ and thickness of 1.7 ㎜ in size. The fruit maturation was investigated to befrom April 27 to June 1, when the best maturation period was about a week, May 11 to May 18. Also, the fruits grown onMay 4 to May 11 were seen to have the bigger in transverse size and weight with a tendency of the earlier maturation datehas the greater the number of seeds. S. thea seeds pretreated for 24 hours at 50℃ were not germinated, while most of thosepretreated for 24 hours at 4℃ were successfully germinated at any degree of temperature (except at a temperature of 10℃). Particularly, the highest germination rate of 55% was made at 15℃, and plumule and radicle were best grown within thetemperature range of 25℃.
송상철,송창길,김주성 韓國藥用作物學會 2014 한국약용작물학회지 Vol.22 No.4
This study was carried out to investigate the vegetation and habitat environment of Sageretia thea which isdistributed in Jeju island, Korea. Sageretia thea were mainly distributed to the west area in Jeju island. Soil pH andEC of Sageretia thea habitat were 5.8 and 0.34dS•m−1. The contents of organic matter, available phosphate, exchangeablepotassium, exchangeable sodium, exchangeable magnesium and exchangeable calcium were 15.27%, 13.6㎎㎏−1,0.27cmol+㎏−1, 1.3cmol+㎏−1, 1.7cmol+㎏−1, 4.9cmol+㎏−1, respectively. Thirty one taxa including 25 families, 31 genus, 27species and 4 varieties were identified surrounding Sageretia thea habitat. Specific plant species were 1 taxon in III grade, 1taxon in I grade and 3 taxa in I grade.
생장조정제 처리가 상동나무 열매의 비대와 수확시기에 미치는 영향
송상철,송창길,김주성 한국약용작물학회 2015 한국약용작물학회지 Vol.23 No.4
This study had been conducted to investigate the effect of some plant growth regulators inducing fruit enlargement and optimal harvest time in Sageretia thea. Two hundred fifty ㎎/ℓ mepiquat chloride treatment, 1㎎/ℓ thidiazuron treatment on full bloom, and 200㎎/ℓ gibberellic acid treatment on 7 days before full bloom resulted in the increase of 21.7% in weight, and 200㎎/ℓ gibberellic acid treatment 7 days before full bloom, 10㎎/ℓ forchlorfenuron treatment 14 days after full bloom, and 1㎎/ℓ thidiazuron treatment on full bloom also brought about positive effects on the enlargement of the fruit, increasing 6.3%, 6.3% and 8.1% in its transverse diameter, respectively. Furthermore, the effects of the plant growth regulator treatments on the harvest time of Sageretia thea were determined as follows: the increase in the optimal harvest time of 57.2 - 75.4%, shorter maturation period, by the treatments with 500㎎/ℓ mepiquat chloride 7 days after full bloom, 100㎎/ℓ gibberellic acid treatment on full bloom, 2.5㎎/ℓ forchlorofenuron 7 days after full bloom and 2㎎/ℓ thidiazuron treatment 7 days before full bloom; and the greater effects of plant growth regulator treatments on the fruit maturation in the following order, gibberellic acid > thidiazuron > forchlorofenuron > mepiquat chloride. The results of this study are expected to be used as a reference data to develop Sageretia thea as a new local specific crop for Jeju island.
송상철,옥지웅,이재은 연세대학교 경영연구소 2013 연세경영연구 Vol.50 No.2
This study analyzes the determinants of the level of TMT Localization of 583 Korean subsidiaries entered in 29 different countries and how the subsidiary experience in host country affects their staffing policy for manager positions at foreign subsidiaries. The results of empirical analysis present that the intra-firm trade dependency of subsidiaries and headquarter technological capabilities show significantly negative effect, whereas subsidiary size shows significantly positive effect on the localization level of management team. Subsidiary experience in host country negatively moderates the effects of intra-firm trade dependency and subsidiary size on local employment policy of foreign subsidiaries but not with headquarter technological capability. The contribution of this research is that we tried to find out the dynamics of localization process of the foreign subsidiary. In particular, we investigated how the experience of foreign subsidiaries in a host country moderates the impact of three key variables on Korean firms' expatriation decisions, which include a dependency of intra-firm trade, subsidiary size, and headquarter technological capability. These findings suggest that to explain local employment policy of Korean MNCs, it is necessary to consider both main and interaction effects of predictors.
GIS를 활용한 부산지역의 해안·강변지역 열섬특성 분석
송상철(Song, Sang Cheol),강인준(Kang, In Joon),손명찬(Son, Myung Chan),한기봉(Han, Ki Bong) 대한공간정보학회 2013 대한공간정보학회지 Vol.21 No.1
주거, 상업, 공공시설용지 등의 토지개발은 시외지역에 비하여 도심지역의 온도가 상승하는 원인이 되어왔다. 따라서 본 연구에서는 강변지역과 해안지역을 중심으로 연구지역을 선정하여 토지이용 및 기후변화에 따른 온도변화를 분석하였고, 또한 지형적 특징과 온도변화와의 상관관계를 알아보았다. 2003년에 비해 2007년 기온은 1.80℃ 증가하였고, 풍속은 0.24m/s 감소하였다. 또한 시가화 지역은 3.27% 증가하였고, 산림지역은 2.54% 감소하였다. 상관관계를 비교 분석한 결과 강변지역은 초지와 나지가, 해안지역은 산림과 초지에서 지형인자와 기후인자간의 상관성이 비교적 높게 나타났다. 이러한 연구결과는 지역 특성에 따라 열섬현상 문제에 대한 방안을 제시, 예측 등의 기초자료로 활용될 것으로 기대된다. Development of housing, industrial and public lands has been a cause to increase a temperature of a city higher than that of a rural area. Knowing that, the research analyzed temperature changes in a riverside district and a coastal area depending on the land usage and climate change in the areas. Add to this, the study examined a correlation between topographic characteristics and temperature changes. According to the results, the temperature was increased by 1.80℃ in 2007 comparing to 2003 while the wind velocity was reduced by 0.24m/s. In addition, a more number of areas were designated as build-up areas which, in return, decreased the forested land. The analysis on the correlation reported that the riverside district has more of grassland and bare land while the coastal area has more of wooded land and grassland. The study is expected to be used as fundamental data for research on heat island effect which would be different by each regional characteristic as it proposes measures to solve the heat island effect.
송상철 ( Sang-chul Song ),홍지원 ( Jiwon Hong ),김상욱 ( Sang-wook Kim ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.1
트위터 이용자 수 증가로 인해, 유저의 타임라인에 하루 새롭게 기재되는 트윗 수가 급증하는 정보 과다 현상이 중요한 이슈로 자리 잡은 지 오래다. 이에 본 논문은 이고-네트워크 정보를 바탕으로 학습 된 분류 시스템을 이용해 각각의 이고 유저마다 트윗 추천에 유리한 추천 방식을 예측하고, 이를 기반으로 선호할만한 트윗을 우선적으로 선별해주는 그래프 기반 트윗 추천 시스템을 제안한다. 실험을 통하여 단일한 추천 방식보다, 최고 11.5% 추천 정확도 성능이 향상함을 확인하였다.