• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2002년도 Proceedings
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• pp.279-281
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• 2002

The results of the specific radioactivity study for Rn-222 in mineral spring water of Khalzan mountain and Janchivlan of Mongolia, using the HP-Ge gamma-spectrometer, are discussed. Some physical and chemical properties in some sample of mineral spring water are determined.

• 한국약용작물학회지
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• 제20권4호
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• pp.251-258
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• 2012

The management and control of mineral nutrients is one of most important techniques to increase the productivity and the quality of Korean ginseng. The mineral nutrients are measured with different plant tissues and different growth stages of 2-year-old ginseng grown under hydroponic culture with two different temperatures. The content of N, P, Ca, and Mg were higher at low temperature in both leaves and roots than those at high temperature. However, the content of K was high in leaves at low temperature compared to that of high temperature, while it was not significantly different in roots. The uptake amounts of N and K was higher throughout the experimental period at low temperature in both leaves and roots than those at high temperature. However, the uptake amount of P was not clearly different between two different temperatures and among six different growth stages. The uptake amount of N, P, K was generally decreased in leaves from June to August, while it was increased in roots. The relationship between dry weight and mineral nutrients in leaves was appeared positive with N, K, Ca, and Mg, but negative P. In roots, N, K, Ca, and Mg were negative, showing that was positive with only P. Comparing the correlation coefficients among mineral nutrients in leaves, N and K were significantly positive correlation each other. P was significantly positive correlation with Na and Zn. In case of roots, N was highly significant positive correlation with K, Mg, and Mn, but P was negatively correlated with Ca, Cu, Na, Fe, and Zn.

• 한국초지조사료학회지
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• 제11권3호
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• pp.189-194
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• 1991

This experiment was carried out to investigate the effect of pure mineral nitrogen fertilization on dry matter yield and to determine the amounts of advisable mineral nitrogen according to difference of annual precipitations in permanent grassland. The results obtained were as follows: 1. Only PK-fertilizing without additional mineral nitrogen application produced 6. 9 tonlha of annual dry matter yields on average in relatively wet years that was higher than in rel. dry and normal years under 3-cut system by 0. 7 and 0.6 ton DMIha, respectively. 2. Due to the lesser rainfall the nitrogen-efficiency was substantially higher with heavy dressing of nitrogen fertilizer. The absolute differences in yield between rel. dry and wet years were 0.4 and 0.7 ton DMIhalyear respectively when dressed with 90 and 120 kgN/ha/cut at 4-, 5- and 6-cut systems, whereas at 3-cut system differences around 1.3 and 1.1 ton Dhllhalyear respectively were recorded. 3. In rel. dry years the most efficient N-dressing rates per ha and year tended to be slightly higher than in rel. wet and normal years. Particularly at 5-cut system 4-7 kg/ha/cut of more nitrogen fertilization was required in order to obtain the highest overyields. 4. The N-dressing rates needed to maintain a nitrogen-efficiency of 8 to 16 kg DM/kg N tended to be stronger particularly at high cut system, and also in rel. dry years higher dressing rates were required that in rel. wet and normal years.

• Journal of Nutrition and Health
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• 제39권5호
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• pp.460-466
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• 2006

To investigate the effects of dietary patterns on bone mineral density and its biochemical markers among Korean healthy college women for 2 years, 34 female college students were recruited through convenience sampling. Bone mineral density was measured using Dual Energy X-ray Absorptiometry (DEXA) twice at baseline and two years later. Osteocalcin and parathyroid hormone were measured in fasting serum and N-teleopeptides of type collagen (NTx) in urine. Dietary intake was assessed by 24-hour recall method 8 times with average 4-month interval. Dietary patterns with percent energy of each food group using cluster analysis were classified into two groups. The first cluster (n = 16) was characterized with high consumption of bread, snack, fast foods, beverage and considerable of rice so it was determined as 'Modified dietary pattern group'. The second cluster was characterized with high consumption of rice and kimchi so determined as 'Traditional dietary pattern group'. There were no significant difference of age, menarcheal age, body mass index but percent of body fat by pattern groups. The traditional group showed higher value of bone mineral density among lumber spine and all femur sites at baseline and 2 years later but it was not significant after adjusted for percent of body fat. Serum osteocalcin and urine NTx was higher among the traditional group at baseline than the modified group. There were similar proportions of carbohydrate:fat:protein between groups but significantly higher intake of protein, iron, vitamin A among the traditional group. In conclusion, there were two distinctive dietary patterns among Korean college women. There was difference of bone mineral density and its biochemical markers between two patterns. Further research would be necessary to explore the relationship between dietary patterns and health risks for larger-sized and various populations.

• Journal of Sport and Applied Science
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• 제7권2호
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• pp.21-28
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• 2023

Purpose: This study was to investigate the effect of a 12-week plyometric training on body composition, physical fitness and bone mineral density in obese male adolescents. Method: Twenty adolescent boys who are obese were randomly assigned to a control group (CON, n=10) or plyometic exercise group (EXE, n=10). The EXE group was performed 3 times per week for 12 weeks. The body composition, physical fitness, and bone mineral density were measured before and after the 12 weeks intervention. Results: The results of this study were as follows: i) In EXE group, the fat mass was significantly decreased between pre and post, whereas the difference of the body weight, BMI, and LBM were not significant. ii) Among the physical fitness factors, grip strength, muscular endurance, and 2 0m shuttle running were significantly improved but flexibility did not show any significant difference. iii) The bone mineral density was significantly improved between pre and post in EXE group. Conclusion: These results suggested that plyometric training for 12 weeks may be effective in improving body composition, physical fitness, and bone mineral density in obese adolescents. Further implications were discussed.

• 한국작물학회지
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• 제48권5호
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• pp.381-387
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• 2003

Winter hairy vetch (HV) can be used as green manure with conventional tillage system (CT), in which chemical N fertilizer required for cultivation of sub-sequent com could be fully saved, or as cover crop with no-tillage system (NT) in which soil could be protected from erosion, control of weed, and the reduction of N fertilizer application. This experiment was carried out to compare the enrichment of soil mineral nitrogen (SMN) at corn root zone, and the changes of com growth and N uptake according to HV amounts (winter fallow, above-ground HV removed, intact HV, and HV added from aboveground HV removed) under two tillage systems in the upland field of National Crop Experiment Station, Suwon, Korea in 1996. HV cultivation during winter decreased SMN a little at com planting. HV incorporation with CT increased SMN rapidly during early growth stage according to rapid decomposition of Hv. SMN by HV cover with NT was increased slowly and its increase was higher in the surface soil (soil layer 0-7.5cm) compared to deep soil layer 7.5-22cm. Com growth and N status at corn silking stage, com yield and N uptake at harvest were increased in proportion to aboveground HV amounts regardless of tillage system. Average hairy vetch nitrogen (HV-N) uptake efficiency by com was 10% higher with CT than with NT in which average HV-N uptake efficiency was 43 %. Corn yields were not different between two tillage systems, but corn N uptake was increased by 33 kgN/ha more with CT than with NT due to the increase of corn N concentration. The increase of SMN and com N uptake from HV cover with NT could not be disregarded though those with CT were higher than with NT

• 한국광물학회지
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• 제25권4호
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• pp.313-322
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• 2012

몽골 우기누르 지역 철-망간 광상과 타미르골 지역 철 광상의 광체는 먼곤체지 층 내에 렌즈상으로 협재되는 특성을 갖는다. 이러한 광상은 캠브리아 기에서 실루리아기에 이르는 화산 기원의 퇴적형 광상인 타미르골-요루골 광상구에 해당된다. 우기누르 지역의 철-망간 광체와 타미르골 지역의 철광체는 주로 규암과 편암을 모암으로 하여 먼곤체지 층 내에 렌즈상으로 협재되어 있다. 우기누르지역의 편암이 주로 세리사이트 편암인 데 비해 타미르골 지역은 주로 백운모 편암이 나타나는 차이를 갖는다. 또한 우기누르 지역의 광석은 망간이10에서 12% 함유되나 타미르골 지역의 광석은 망간이 1% 이하로 함량이 낮은 특성을 갖는다. 우기누르 철 망간 광상의 철 광물은 주로 자철석, 적철석이 우세하게 나타나고 기타 철 산화물과 황철석이 미량으로 수반되어 나타나며, 망간 광물은 주로스페사틴, 버네사이트가 우세하게 나타나고 기타망간 산화물이 수반되어 나타난다. 타미르골 지역의 철 광석은 자철석이 우세하게 나타나고 적철석이 수반되며 황철석, 철 산화물, 탄산질 철 등이 미량으로 수반되어 나타난다. 우기누르 철-망간 광상에 대한 육상 자력탐사 결과 높은 자기 이상값을보이는 영역이 지표에서 확인된 광체의 방향과 같은 약 $N30^{\circ}W$ 방향으로 나타나며 지표에서 확인된 광체 이외에 지표에 드러나지 않은 부분에서도 연장되는 것이 확인되었다.

• 한국작물학회지
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• 제46권5호
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• pp.387-394
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• 2001

Blackgram (Vigna mungo) is more salt tolerant than mungbean (Vigna radiata). This study was initiated to know whether the accumulation pattern of mineral ions in different plant parts plays a significant role in the differences in salt tolerance between the two Vigna species. Different mineral ions, viz. N, Cl, Na, K, Mg and Ca in different organs of two varieties of each of blackgram- Barimash-l (susceptible one) and Barimash-2 (tolerant one), and mungbean-Barimung-3 (tolerant one) and Barimung-4(susceptible one), were analyzed after growing with 0, 50, 75 and 100 mM NaCl solutions. The two crops showed a decreased but similar pattern of total N accumulation under saline conditions. The tolerant variety of both the crops showed a less reduction in total N than the susceptible one. Leaves showed the maximum while stem the minimum N, irrespective of levels of salinity. C $l^{[-10]}$ and N $a^{+}$ accumulation increased with the increasing salinity levels. Interestingly, similar to a halophyte, the salt tolerant blackgram exhibited conspicuously higher amount of N $a^{+}$ in the shoot than the salt-susceptible mungbean. However, the tolerant varieties showed less amount of N $a^{+}$ than the susceptible one, especially in blackgram. Seeds of both Vigna spp. accumulated the minimum amount of N $a^{+}$ than other plant parts. $K^{+}$ accumulation decreased by salinity in most of the plant parts, except seeds. Blackgram showed larger reduction in K than mungbean. The $Mg^{++}$ increased in leaves, petioles and stem by salinity while decreased in the roots, podshells and seeds in both the crops. Salinity increased $Ca^{++}$ accumulation in all plant-parts except roots of both Vigna spp. Apparently, the leaves of mungbean accumulated higher concentration of $Ca^{++}$ than blackgram. Varietal differences in the accumulation pattern of $K^{+}$, $Mg^{++}$ and $Ca^{++}$ were not clear. It was concluded that blackgram, presumably, possesses a similar salt tolerance mechanism to halophyte, and the pattern of accumulation of mineral ions in blackgram and mungbean was not fully ascribed to the differences in salinity tolerance between the two Vigna species.gna species.ies.s.ies.

• 한국초지조사료학회지
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• 제18권2호
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• pp.123-128
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• 1998

1996년 작물시험장 전작포장에서 헤어리베치의 피복 및 질소시비가 옥수수의 생육 및 질소 흡수량 에 미치는 영향을 조사한 결과를 요약하면 다음과 같다. 봄 초 고사시키기 전 헤어리베치의 피복은 표 토충(O~7.5cm)과 충위 7.5~22cm에서 토양의 무기태 질소 함량을 감소시켰으나 옥수수 6엽기(추비시기)의 토양에서 무기태 질소 함량을 중가시켰다. 질소 비료 무시용시 헤어리베치의 피복은 출사시까지의 옥수수 생육, 건물중 그리고 출사기 질소 흡수량이 무피복에 비해 감소되었지만 출사기 이후 건물중이 회복되어 수확시에는 차이가 나타나지 않았다. 질소 비료 135kgFN/ha 시용시 헤어리베치의 피복은 옥수 수 출사기를 다소 늦추고 건물중을 무피복보다 감소 시켰으나 수확기에는 차이가 없었다. 질소비료 무시 용시 헤어리베치의 피복은 옥수수 전질소 흡수량을 중가시켰는데 이는 주로 출사기 이후의 질소 흡수량의 중가에 기언하였다. 헤어리베치의 피복에 관계없 이 질소비료 135kgFN/ha의 시용은 질소 무시용시 보다 옥수수 생육파 수량을 중가시 키고 수확시 질소 흡수량도 증가시켰는데 특히 무피복구에서 출사기까지의 질소 흡수량을 많이 중가시켰다. 시비한 질소비료는 주로 출사기 전에 주로 흡수되었고 헤어리 베치에서 무기화된 질소는 출사기 이후에 많이 흡수되었으므로 헤어리베치를 이용한 옥수수 재배에서는 옥수수의 초기생장 및 질소 흡수량을 중진시키기 위해서 헤어리베치에 의해 무기화 될 질소를 제외한 나머지 질소량은 옥수수 파종전 기비로 전량 시용하는 것이 바람직한 것으로 보였다.

• 자원리싸이클링
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• 제26권3호
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• pp.39-46
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• 2017

탄소환원질화법을 이용하여 질화알루미늄(Aluminum Nitride: AlN)을 제조하는 연구를 실험실 규모로 수행하였다. 고품위 알루미나 분말과 탄소(carbon black)를 배합하여 흑연 도가니에 장입하고, 노내 분위기를 진공으로 한 다음 질소 가스를 흘려주어 온도($1,600{\sim}1,700^{\circ}C$), 시간(0.5~6 hr), $N_2$유량($4.7{\times}10^{-6}{\sim}20{\times}10^{-6}m^3/sec$), 장입 시료층 높이(0.5~20 mm)를 변화시키면서 AlN을 합성하였다. 실험결과, 고순도 알루미나와 탄소 혼합물을 질소 분위기의 $1600{\sim}1700^{\circ}C$ 온도 범위에서 반응시킬 때 반응 온도가 높을수록 생성된 AlN의 1차 입자 크기가 커지고, 반응 활성화 에너지는 382 kJ/mol로 화학 반응이 율속 단계로 판단되었다. 시험 제조한 AlN들의 산소 함량은 0.71~0.96 wt%였고, 질소는 30.7~35.1 wt%로서 상용 제품과 근접한 결과를 나타내었다.