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정재엽,박준호,김종익,임종택,이상래,김춘식 한국산림과학회 2010 Forest Science And Technology Vol.6 No.2
The growth, carbon and nitrogen responses of container grown 2-0 red (Pinus densiflora) and black pine (Pinus thunbergii) seedlings were examined at three types of container volume (250 cm³, 350 cm³, 500 cm³) with or without foliar fertilization. There were significant main and interaction effects of seedling growth on container volume and foliar fertilization. Root collar diameter, height, and dry mass of both pine seedlings decreased significantly (P < 0.05) with decreasing of container volume with fertilization, while no effect of container volumes without fertilization. Carbon and nitrogen concentrations of foliage were significantly different (P < 0.05) among container volumes, while other seedling components were not significantly different (P > 0.05) among the container volumes or between seedling types. The results indicate that growth characteristics and nitrogen status on container grown red and black pine seedlings were enhanced by increased container volumes with fertilization.
정재엽,김춘식 한국산림과학회 2011 Forest Science And Technology Vol.7 No.3
We examined the growth, carbon and nitrogen response of container-grown 2-0 red pine (Pinus densiflora) and black pine (P. thunbergii) seedlings at different types of fertilization. Red pine and black pine seedlings were treated with 0.3% or varying rates of water-soluble foliar fertilizer and a slow-release solid compound fertilizer. Root collar diameter and height of both pine seedlings were not significantly different among fertilizer types, while significantly higher in the fertilization than in the control treatments (P 5 0.05). The greatest dry mass of the seedling was observed in the varying rates of foliar fertilization. Carbon concentration among the seedling components was generally higher in foliage or stem than in roots, but that of seedling components was not affected by fertilization types. Nitrogen concentration of seedling components was not significantly different among fertilization types, but significantly greater (P 5 0.05) in the fertilization than in the control treatments. These results indicate that morphological characteristics and carbon and nitrogen status of container-grown red pine and black pine seedlings responded similarly between slow-release solid compound fertilizer and water-soluble fertilizer.
아동들의 태권도 수련활동참가에 따른 열등감 및 자아존중감의 관계
정재엽,정국현,김지영,김현철,이용국 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.2
The purpose of this study was to identify the relationship between children's Inferiority and self-esteem during Taekwondo practice. In order to achieve this purpose, 480 subject were selected among participants of Taekwondo activity programs in the Seoul area by using the stratified cluster random sampling method. Out of the 480 questionnaires responded to. only 414 were used for data analyses because 66 were responded to incompletely or incorrectly. The instrument for data collection was a questionnaire in which Inferiority and self-esteem consisted of items identified by Jun(1999) and Jun(1993), respectively. The statistical methods utilized in the study for analyzing the collected data were reliability analysis, descriptive statistics, one-way ANOVA, standard multiple regression analysis and the following results were obtained: First, both Inferiority and self-esteem differ statistically and significantly according to both sociodemographic variables. Second, both Inferiority and self-esteem differ statistically and significantly according to Taekwondo practice. Third, Inferiority statistically and significantly influences self-esteem.
정재엽,김춘식,안현철,조현서,추갑철 한국생태학회 2009 Journal of Ecology and Environment Vol.32 No.2
This study was carried out to evaluate litterfall dynamics in three adjacent coniferous tree plantations (larch: Larix leptolepis; red pine: Pinus densiflora; rigitaeda pine: P. rigitaeda) planted in the same year (1963), and growing under similar environmental conditions in the Sambong Exhibition Forests, Hamyanggun, Gyeongsangnam-do. Litter was collected monthly between July 2006 and June 2008. Needle, broad leaf and total litter inputs followed a similar monthly pattern in the three coniferous plantations. The amounts of needles, flowers, and miscellaneous litter were significantly lower in the larch than in the two pine plantations, while branch litter was significantly higher in the larch than in the two pine plantations. Average total litterfall for two years was significantly higher for the pine (5,475 kg ha-1 yr-1 for red pine and 5,290 kg ha-1 yr-1 for rigitaeda pine) plantations than for the larch (3,953 kg ha-1 yr-1) plantation. Needle litter comprised about 73.1% of total litterfall for the rigitaeda pine, 70.8% for the red pine and 62.9% for the larch plantations. Our results demonstrate that litterfall inputs can be affected by tree species.
차세대 위성탑재컴퓨터를 위한 프로세서 모니터 및 고장주입시스템의 설계 및 구현
정재엽,최종욱,천이진 사단법인 한국위성정보통신학회 2014 한국위성정보통신학회논문지 Vol.9 No.4
In order to verify normal operation of satellite OBC(On Board Computer), it is essential that processor monitoring anddebugging. So we are using the GRMON of Aeroflex Gaisler. It provides a lot of features for debugging of LEON processorbut we can't use that features on the NGSCB(Next Generation Spacecraft Computer Board) except a few things. So thecost-effectiveness is very low. And for hardware fault injection, we are using a method of modify satellite flight software,because we can't modify GRMON. This method can not guarantee normal operation of the satellite flight software. So inthis paper we were developed the processor monitoring and fault injection tool for NGSCB. 위성탑재컴퓨터의 정상동작을 검증하기 위해 프로세서의 모니터링 및 디버깅은 필수적이며, 현재 Aeroflex Gaisler의 GRMON을사용하고 있다. GRMON은 LEON 프로세서를 모니터링 및 디버깅하기 위한 다양한 기능을 제공하지만, 국내에서 제작한 위성탑재컴퓨터에 사용할 수 없는 기능이 많기 때문에 가격 대비 성능이 낮다. 또한 LEON 프로세서의 DSU를 이용하면 모든 메모리맵에접근이 가능하여 프로그램 실행 중 고장을 주입할 수 있음에도 불구하고, GRMON을 수정할 수 없기 때문에 그동안 위성탑재소프트웨어를 수정하여 하드웨어에 고장을 주입하는 방식을 사용하였다. 이런 고장주입 방법은 위성탑재소프트웨어의 형상을 변경하는것이므로 고장에 따른 소프트웨어의 영향성을 정확히 판단할 수 없다. 이에 향후 저궤도 관측위성에 적용될 LEON2FT AT697F프로세서를 탑재한 차세대 위성탑재컴퓨터(NGSCB, Next Generation Spacecraft Control Board)에서 프로세서 디버깅을 위한 기본 기능을 제공하고, 실제 위성에 탑재되는 위성탑재소프트웨어와 동일한 환경에서 하드웨어 고장을 주입할 수 있는 시스템을 설계 및 구현하였다.
Structural, Optical, and Chemical Properties of Cadmium Phosphate Glasses
정재엽,정윤기,황문경,박현준,최수연,김정환,류봉기 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.2
In this study, we prepared cadmium phosphate glasses with various compositions, given by xCdO–(100 – x)P2O5 (x = 10–55 mol%), and analyzed their Fourier transform infrared spectra, dissolution rate, thermal expansion coefficient, glass transition temperature, glass softening temperature, and optical band gap. We found that the thermal expansion coefficient and dissolution rate increased while the glass transition temperature and glass softening temperature decreased with increasing CdO content. These results suggest that CdO acts as a network modifier in binary phosphate glass and weakens its structure.
정재엽 계명대학교 산업경영연구소 2001 經營經濟 Vol.34 No.1
This paper analyze the behavior of conditional heteroscedasticity in stock returns to find the firm size effect in volatility. Using EGARCH-M model, estimation of the conditional heteroscedasticity in monthly excess returns of size-indexes if performed from January 1980 to December 1999. then conditional heteroscedasticity difference between size-indexes is examined. Empirical results do not show statistically significant volatility difference between size-indexes. These results here cast suspicion on the existence of the firm size effect in stock returns volatility.