• 동아시아식생활학회지
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• 제23권5호
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• pp.519-532
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• 2013

The purpose of this study was to make a comparative analysis of dietary habits, snacks, eating out and fast-food intake between students with a relatively early sexual maturity and others with a relatively late sexual maturity in a bid to grasp the impact of dietary behaviors on sexual maturity. The subjects in this study were 565 boys and girls who resided in Seoul and Gyeonggi province. They included fifth- and sixth-grade school children and seventh-grade middle school students. To classify the selected students according to the level of sexual maturity, the students of the same month age were divided into two groups in consideration of the stage of their sexual maturity and that of the other age groups. The early mature group was significantly taller and weighed more than the late mature group irrespective of gender. According to Tanner stages, the boys of the early mature group reached a 3.03 stage of sexual maturity when the sexual organs were taken into account, and those of the late mature group reached a 1.50 stage of sexual maturity. The girls of the early mature group reached a 3.43 stage of sexual maturity on the basis of breast, and those of the late mature group reached a 2.73 stage of sexual maturity. Concerning eating out, the early mature group ate out more frequently than the late mature group. In regard to snacks, the early mature group had a snack more often. The findings of the study indicated that there were differences in physical development and some dietary behaviors according to sexual maturity. The early mature group had a snack and ate out relatively more often than the late mature group, which showed that some dietary behaviors had an impact on the sexual maturity of the teens who arrived at the age of puberty.

• 한국초지조사료학회지
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• 제16권4호
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• pp.291-298
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• 1996

This study was carried out at Crop Experiment Station in 1993 and 1994. The objective of this study was finding out variation of growth and yield of corn according to maturity. Hybrids of corn used in this study were early maturing corn Comet80, Elite90, Royaldent IOOT, Royaldent T$\times$llO, P3525, P3394, medium maturing corn Royaldent 120T. and late maturing corn Jungbuok, P3144W. G4743. Stalk height, leaf number, ear weight, stover weight, and TDN yield of early maturing corn were linearly increased with prolonged maturity in 1993 growing season. Leaf number, and stover weight of early and late maturing corn were linearly increased with prolonged maturity in 1994 growing season. But ear weight of late manuring corn was not increased as much as that of early manuring corn with prolonged maturity. Increase of total DM and TDN yield of late maturing corn was due to stover weight increase compared with ear weight increase of early maturing corn. Leaf number and stover weight were highly correlated with silk (Growing Degree Days) GDD.

• 한국초지조사료학회지
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• 제17권3호
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• pp.305-314
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• 1997

Nineteen clones of Jerusalem Artichoke (JA) from several countries were collected through the series of experiments about JA started in 1979. Collected clones were screened for adaptibility in Korea and showed introduction path way. The results about an ecological response of collected clones including flowering, tuberization, biomass production, sugar contents and grouping of collected clones for use of genetic material were as follows; 1. Nineteen clones collected were ffom Korea(2), Japan(l), USA(Z), Canada(2), France(4), Germany(7), and USSR(1). 2. Through the characteristics of top collected clones were divided to the types of branch-non branch, short and long plant height, and early and late maturity. Tuber characteristics were mainly grouped to the types of white skin color-violet skin color, clusters-single unit, round-elongate, and knotty-smooth. 3. Total sugar yields 6-om top at flowering time were 490 - 630kgl10a and 6-om the tuber were 420 -490 kg/ IOa through the high yielding clones. The top-high yielding clones were Mammoth French White, Fuseau 60, Nahodka, and JA3. The higher tuber yields were got from the clones of D- 19, Colombia, Bianka and Mammoth French White. 4. Collected clones were grouped to three and first group was characterized to early maturity and short plant height and second group to medium and finally, third group to late maturity and high plant height. 5. High yielding of top was 6-om the I group of early maturity and short plant height and high yielding of tuber h m III group of late maturity and high plant height.

• Asian-Australasian Journal of Animal Sciences
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• 제7권1호
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• pp.41-48
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• 1994

This experiment was carried out in order to evaluate the chemical composition and rumen degradation characteristics of Italian ryegrass harvested at three different growth stages, i,e. pre-blooming, early-blooming and late-blooming. Degradation values were obtained by incubation of the samples using the nylon bag technique on the rumen of sheep fed a normal diet (Timothy hay with 200 g/d concentrate per head) for 12, 24, 36, 48 and 72 hours, respectively. Neutral detergent fiver (NDF) content was highest at late-blooming (64.4%) while no difference was found among the pre-blooming and early-blooming (49.4% vs 48.3%). However, acid detergent fiber (ADF) content markedly increased from 30.0% at pre-blooming to 35.4% and 46.4% at early-blooming and late-blooming, respectively. Lignin and silica contents also increased as advancing maturity of the grass, Rumen degradation of dry matter (DM) significantly reduced (p < 0.05) as advancing maturity of the grass. Ruman degradation cellulose and ADF at pre-blooming were significantly higher (p < 0.05) than those of early-blooming and late-blooming. However, no significant differences were observed among the early-blooming and late-blooming. With advancing maturity, rumen degradation of NDF and hemicellulose significantly reduced (p < 0.05) at the incubation times.

• 한국초지조사료학회지
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• 제24권4호
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• pp.309-316
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• 2004

본 연구는 파종기가 다른 추파호밀의 Feekes scale에 의한 생장발달을 분석하기 위하여 수행하였다. 시험배치는 10처리 3반복의 분할구배치로 주구에는 9월 30일과 10월 15일의 파종시기를, 세구로는 'Kodiak', 'Koolgrager', 'Danko', 'Homil22', 'Olhomil' 품종을 두었다. 초장은 조기파종이 만기파종보다 높았으며, 공시품종간에는 조생품종이 가장 높았다. 분얼경수는 조기파종시에 48.0개로 만기파종시의 24.3개보다 높았으며, 공시품종간에는 만생품종이 다른 품종보다 높게 나타났다. 생장발달 분석에 있어서 조기파종이 만기파종보다 3일 빨랐다. 조기파종시에는 조생품종인 'Olhomil'이 만생품종인 'Danko' 보다 숙기가 빨랐으며, 만기파종시에도 조생품종인 'Olhomil' 및 'Koolgrager'가 빠른 숙기를 보여주었다. 그러므로 시험에서 얻은 결론은 추파용 호밀의 생장과 발달단계를 Feekes scale로 비교한 결과 'Olhomil' 및 'Koolgrazer'는 조생종,'Homil22'는 중생종 그리고 'Kodiak' 및 'Danko'는 만생종으로 분류가 가능했다.

• Asian-Australasian Journal of Animal Sciences
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• 제14권12호
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• pp.1705-1711
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• 2001

Silage corn (Zea mays L) is grown extensively in livestock operations, and many managements focus on forage yield. This experiment was conducted at Seoul National University (SNU) Experimental Livestock Farm, Suwon in 1998. We determined the effect of planting date and harvest stage on forage yield and quality responses of corn hybrids (five relative maturity groups). The five maturity groups (100 d, 106 d, 111 d, 119 d and 125 d) were planted on 15 April and 15 May, and harvested at maturity stages (1/3, 1/2 and 2/3 kernel milkline). Whole plant dry matter (DM) and ear percentages had significant differences among corn hybrids. Ear percentages of early maturing corns (100 d and 106 d) were higher than for other hybrids. Ear percentage at the early planting date was higher than that at the late planting date for all corn hybrids. The DM and total digestible nutrients (TDN) yields of the 106 d and 111 d corn hybrids were higher than other hybrids, and the DM and TDN yields at the early planting date were higher than that at the late planting date. The acid detergent fiber (ADF) and neutral detergent fiber (NDF) percentages were greater for the late maturity corn hybrids. For plants of the early planting date, the ADF and NDF percentages were lower than for those of late planting date for hybrids. From the comparison among harvest stages, ADF and NDF percentages were decreased as harvest stage progressed. The TDN, net energy for lactation (NEL), and cellulase digestible organic matter of dry matter (CDOMD) were decreased as maturity of corn hybrid delayed. The TDN, NEL, and CDOMD values at the early planting date were higher than those at the late planting date among for corn hybrids. From the comparison among harvest dates, TDN, NEL, and CDOMD values were increased as harvest stage progressed. The correlation coefficient for DM percentage of grain at harvest with DM and TDN yields were 0.68*** and 0.76***, respectively. And the correlation coefficient for ear percentage with ADF, NDF, and CDOMD were -0.81***, -0.82*** and 0.73***, respectively. Our study showed differences of silage corn in forage production and quality resulting from hybrid maturity, planting date, and harvest stage. We believe that for the best silage corn, selection of the hybrid and best management practices are very important.

• Child Health Nursing Research
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• 제14권3호
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• pp.305-314
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• 2008

Purpose: This study was done to identify sexual maturity, sexual knowledge and sexual attitude in late elementary school children and to provide basic data to develop more concrete and practical applications for sexual education. Method: The participants were 1,959 fifth and sixth graders from 8 elementary schools in Busan and Gyungnam. Result: Sexual maturity for boys was at the $1.3{\pm}\;.6$ stage and pubic hair $1.2{\pm}\;.6$. Breast maturity for girls was at the $2.3{\pm}\;.7$ stage, and pubic hair, $1.7{\pm}\;.8$. Of the boys, 5.9% had experienced nocturnal emission, and of the girls, 20.9% had experienced menarche. Sexual knowledge was lower than the mean. They were not well informed about contraception and sexual disease. Sexual knowledge of girls and of sixth graders was higher than boys and fifth graders. The more mature students had higher sexual knowledge. Sexual attitude was generally positive but was more positive for girls than for boys. Sexual maturity, sexual knowledge, and sexual attitude were positively correlated. Conclusion: Because sexual maturity comes earlier, systematic sexual education is needed for elementary students. Institutional and economic support should continue to be given to the sexual education programs in school, home and community.

• 한국작물학회지
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• 제68권4호
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• pp.431-437
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• 2023

본 시험은 강원도 북부 지대에서 대한민국 육성 조 품종의 재배모형을 설정하기 위하여 강원도 화천과 인제의 농가 포장에서 조생 품종 '미리메조'와 만생 품종 '황미차조', '삼다차조', 그리고 손가락조 품종 '손가락조 1호'에 대한 파종 시기를 달리하여 출수기 생태 특성을 분석하였다. 1. 강원도 북부지대에서 조 조생종의 출수기는 파종기가 5월 중순(5/15)일 때, 8월 초순으로 출수일수는 약 80일이었으며, 6월 하순(6/20) 파종 시에는 8월 하순으로 출수일수는 약 65일이었다. 2. 만생종은 5월 중순일 때, 8월 중하순(8/18~8/26)으로 약 100일이었으며, 6월 하순(6/20) 파종 시에는 9월 중순(9/8~9/15)으로 약 85일이었다. 3. 출수기 적산온도는 조생종은 파종기 5월 중순의 약 1,700℃에서 6월 중순의 약 1,500℃이었으며, 만생종은 약 2,100℃에서 약 1,900℃의 범위를 보였다. 4. 출수기 일장시간은 조생종은 14.0 h에서 13.2 h로, 만생종은 13.2 h에서 12.5 h의 범위였다. 5. 강원도 북부지대에서 국내 조 품종의 출수 한계기를 8월 하순으로 고려할 때, 출수기 한계 적산온도는 조생종은 약 1,500℃, 만생종은 약 2,000℃로 산정되었다. 6. 출수기간 중 일평균 기온이 증가함에 따라 출수일수는 단축되었으며, 두 특성 간에 부의 상관관계를 보였다. 7. 파종기 지연에 따른 출수기간 중 일평균 기온의 증가는 출수일수 단축 및 적산온도의 감소를 유도하였다.

• 한국연초학회지
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• 제4권1호
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• pp.37-42
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• 1982

Korean local and introduced varieties were classified by the cluster analysis of correlation and taxonomic distance based on nineteen growth characters. 1. Thirty six varieties can be classified into three groups(I, II, III) by WVGM (weighted variable group method) 2. Major characters for classifying cultivars were days to flowering, number of leaves, leaf length, stem diameter and width of midrib: the five characters seemed to be useful in monothetic classification. 3. Korean varieties were similar to oriental, and japanese varieties to taiwan. 4. WVGM was more accurate and meaningful than classification by WPGM (weighted paired group method) and reticulate diagram of correlation. 5. Characteristics of each group: Group I closely related to many leaves, late of maturity and broad leaf type, Group II related to medium leaves, late of maturity and narrow leaf type, Croup 19 related to few leaves, early of maturity and medium leaf type respectively.

• 한국농림기상학회:학술대회논문집
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• 한국농림기상학회 2011년도 학술발표회
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• pp.16-18
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• 2011

Evaluation of climate change on the rice productivity was conducted using crop growth simulation model, where Odae, Hwaseong, Ilpum were used as a representative cultivar of early, medium, and medium-late rice maturity type, respectively, and climate change scenario 'A1B' was applied to weather data for future climate change at 57sites. When cropping season was fixed, rice yield decreased by 4~35% as climate change which was caused by poor filled grain ratio with high temperature and low irradiation during grain-filling. When cropping season was changed, rice yield decreased by only 0~5% as climate change which was caused poor filled grain ratio with low irradiation during grain-filling period. However, this irradiation decline was less than when cropping season was fixed. Therefore, we need to develop rice cultivars resistant to low irradiation which can maintain high filled grain ratio under poor irradiation condition, and late maturity rice cultivars whose growing period is longer than the present medium-late maturity type.