• Child Health Nursing Research
• /
• 제12권4호
• /
• pp.506-513
• /
• 2006

Purpose: The purpose of this study was to evaluate the effects of school safety education for children to increase their safety behavior. Method: The participants were 262 fourth graders enrolled in S elementary school located in Anyang city. The participants were randomly assigned to three groups. For the first experimental group, school safety education was provided for both children and parents. For the second experimental group, safety education was provided only for the children. For the control group, no treatment was given. Result: The first experimental group showed the highest increment on the classroom safety activities score. The first experimental group also had the highest increment on the outside-the-classroom safety activities score. Further, the first experimental group showed the highest increment on the traffic safety activities score. Conclusion: Safety education in the elementary school is very effective to ensure children are protected from school and traffic accidents. Also safety education can be more effective if safety related parent education programs are provided to parents. Therefore safety education should be provided systematically for both children and their parents to prevent childhood accidents.

• The Plant Pathology Journal
• /
• 제16권4호
• /
• pp.227-230
• /
• 2000

A total of 90 isolates of Fusarium oxysporum f.sp. melonis, the causal agent of oriental melon (Cucumis melo var. makuwa) wilt, was isolated from symptomatic tissues of oriental melon from 4 provinces in Korea. These isolates were grouped into vegetative compatibility groups (VCGs) by demonstrating heterokaryosis through complementation using nitrate nonutilizing (nit) mutants. No self-incompatibility was observed in any of isolates. All isolates were grouped into 3 VCGs ; A, B, and C. iSOLATES BELONGING TO VCG A and VCG B accounted for 87% and 91% of the fungal population collected in 1991 and 1993, respectively. As the increment of cultivation period in the same field, the proportion of isolates belonging to VCG B increased whereas that of isolates belonging to VCG A decreased. Mean virulence of a total population increased as the increment of cultivation period in the same field. Isolates belonging to VCG B showed the highest increment of virulence. These data suggest that replanting of a host plant in the same field may cause increase of virulence in the pathogens. Furthermore, virulence of F. oxysporum f.sp. melonis isolates is related to the VCGs.

• 한국식품영양학회지
• /
• 제11권5호
• /
• pp.536-541
• /
• 1998

This study was carried out to investigate the changes of characteristics of myofibrillar protein for the vacuum chilled, the air frozen or the rechilled Holstein beef loin. The vacuum chilled beef was stored at 1$^{\circ}C$ and the air frozen beef was stored at -20$^{\circ}C$ for 60 days. The rechilled beef was restored for 3 days at 1$^{\circ}C$ by using the vacuum chilled or the air frozen beef. Myofibrillar protein extractability, 30,000 dalton component content and Mg-ATP ase activity for the vacuum chilled beef were higher than those of the air frozen beef. Each parameters increased significantly for the vacuum chilled beef after the 20 days storage, but there was no significant difference for the vacuum chilled beef after the 20 days storage, but there was no significant difference for the air frozen beef during the 60 days storage. By the rechilling process, myofibrillar protein extractability of the vacuum chilled and the frozen beef were not significant difference. The 30,000 dalton component of the vacuum chilled beef was showed not significant increment by rechilling, but the frozen beef was showed significant increment by rechilling. The Mg-ATPase activity of myofibrillar protein of the vacuum chilled beef was not changes by rechilling, but the frozen beef after the 20 days storage was significant increment by rechilling.

• 한국안전학회지
• /
• 제27권4호
• /
• pp.43-49
• /
• 2012

In the design of high speed railway bridges is important a impact factor as a tool of assessing the dynamic capacitys of bridges. However, the impact factor(or dynamic amplification factor, DAF) of high speed railway bridges may essentially be changeable because the dynamic response is affected by the long train length(380 m), number of axles and high speed velocity(300 km/h)(Korea Train eXpress: KTX). Therefore, on this study will be examined the dynamic capacity and stability of the typical PSC Box Girder of high speed railway bridge. At first, the static/dynamic analysis is performed considering the axle load line of KTX based upon existing references. Additionally, the KTX moving load is transformed into the dynamic time series load for conducting various parameter studies like axle length, analytical time increment, velocity of KTX. The time history analysis is repeatedly performed to get maximum dynamic responce by varying axle load length, analytical time increment, velocity of KTX. The study shows that dynamic analysis has resonable results with optimal axle load length(0.6 m) and time increment(0.01 sec.) and maximum DAF and dynamic resonance happens at 270 km/h velocity of KTX.

• 한국생활과학회지
• /
• 제14권1호
• /
• pp.107-117
• /
• 2005

The purpose of this study is to develop the size and grading increments chart for the middle-aged obese women compared with normal women in middle age. Seven hundred and thirty three women's data from the 4th National Korean Size Survey for Standardization (1997) were analyzed. It was found that size increment of bust and hip girth of obese women was different from that of ordinary middle-aged women. The rate of coverage for a certain set of size specification and the grading increment value for the clothing of Korean obese women in middle aged group were also suggested. The relative percentage value of grading rule based on the change in bust girth increment of Korean obese women was quite different from that of American women. In conclusion, it was noted that the characteristics of the body size specification of obese women was quite different from those of the corresponding age group, so that the separated size specification and grading rule are needed to be used in the manufacturing process of obese women's clothing.

• 아시안잔디학회지
• /
• 제3권1호
• /
• pp.5-12
• /
• 1989

Tiller numbers per Unit area were increased as plant density heightened followed by little difference in tiller number in 110 days after transplanting(ll0DAT), this being caused by the immediate increment of tiller since' 90DAT During the growth period, the greatest number of green leaves per unit area was attained in 90DAT of both 160-density and 200-density plots, and in l00DAT of 40-, 80-, and I 20-density plots. Thus, the period to reach the maximum green leaf number with the high plant density was earlier than with the' low plant density. The increment of plant density increased the DM weight of ahoveground part and, with 40-densitytreatment. DNI weight was increased 6.1 times as much up to 110DAT as up to 7ODAT but 2 to 2.9 times with other ehe'nsity treatments. The' rate of increase in stolon length was greatest at the period between 80 and 90DAT when DM weight of stolon showed a large increment. Meanwhile, the average number of stolon was 1.7 at 70DAT but was increased up to 10 at 110DAT probably due to accelerative appeance of Ist stolon branch since 8.0DAT. DM weight of stolon was found to exceeded that of root after 90DAT Thus it was concluded that, when turfs is estahlished from sprig. it may be desirable for first mowing practice to be made at least within l00 days after planting.

• 물과 미래
• /
• 제28권3호
• /
• pp.197-204
• /
• 1995

인구의 도시집중으로 인하여 유역의 유출용적이 증대하며 이로 인한 합류부의 수위상승으로 내수배제가 불가능하게 되어 침수피해가 발생하고 있다. 본 실험연구에서는 소유역 하천에서 우수거의 합류로 인한 본류하천의 흐름변화를 실험하였으며, 하천의 수위상승을 소하천(본류)의 유량과 경사, 우수거(지류)의 유량과 경사 및 합류각에 따른 본류의 수위상승을 분석하였다. 실험결과 본류하천의 경사에 대해서는 경사가 급할수록 수심비가 증대하는 것으로 나타났으며, 본류의 유량은 적을수록, 지류의 유량은 많을 수록 수심비는 크게 나타났다. 합류각에 대해서는 합류각이 작을수록 수심비가 작은값을 나타내고 있다. 이와 같이 도시 소하천의 합류시 수심비의 상승영향을 보면 합류각, 지류유량 및 본류유량 등의 순으로 상승영향이 밀접하게 나타났다.

• 공업화학
• /
• 제5권6호
• /
• pp.943-948
• /
• 1994

본 실험에서는 카본블랙 함량에 따른 미가황고무 혼합물의 물리적 특성과 가황고무 혼합물의 팽윤거동에 대해 고찰하였다. 카본블랙 함량 증가에 따라 미가황고무 혼합물 중의 bound rubber 함량은 증가하였으며 ${\alpha}_f$는 1.46이었다. 또한 고무 혼합물 중의 카본블랙은 구형입자의 거동을 보여주었다. Mooney-Rivlin의 응력-변형 방법에 의해 구한 가황고무의 $C_1$값은 카본블랙 함량 증가에 따라 증가하는 경향을 보였다.

• 한국건축시공학회지
• /
• 제5권2호
• /
• pp.161-166
• /
• 2005

This study is to evaluate on the increased cost of construction according to the depth change of concrete slabs in apartment building. When we increased the depth of concrete slab from 150mm to 180, 210mm, the qualitative and cost of construction were calculated by the high-rise type, the unit-size type. As a result of this study, in 32 Pyong type, increment of construction cost rate appeared by $5.1\%$ in case of increase from slab 150mm to 180mm, and $10.0\%$ in case of increase from slab 150mm to 210mm. In 45 Pyong type, Increment of construction cost rate appeared by $5.7\%$ in case of increase from slab 150mm to 180mm, and $10.2\%$ in case of increase from slab 150mm to 210mm. In 55 Pyong type, Increment of construction cost rate appeared by $2.4\%$ in case of increase from slab 150mm to 180mm, and $8.9\%$ in case of increase from slab 150mm to 210mm.

• 대한화학회지
• /
• 제22권3호
• /
• pp.128-132
• /
• 1978

산화환원 전위차 적정에 있어, 수치미분법으로 얻은 적정곡선의 2차 미분이 0이 되는 점을 얻어 종말점으로 삼을 때, 그 오차의 성격을 전자계산기를 사용하여 계산하였다. 그 결과로부커 당량점이 포함되는 시약첨가량의 어느 부분에 당량점이 존재하는 가에 따라 종말점의 오차가 변화함을 알 수 있다. 오차는 그 중심점에서 당량점이 벗어남에 따라 증가하여 최대 오차는 첨가량의 약 1/2이다. 따라서 수치미분법으로 영 2차미분점을 얻는 경우에는 적정곡선의 최대 기울기의 점을 얻어 두 값을 비교해 보는 것이 바람직스럽다. 또 종말점 부근에서는 묽은 시약을 사용하여 적정하는 방법으로 오차를 작게 할 수 있다.