본 연구는 여성노인을 대상으로 라인댄스와 저항성운동을 적용한 복합운동프로그램이 신체수행능력, 골밀도 및 부갑상선호르몬에 미치는 영향을 구명하기 위하여, 만65세~75세 여성노인을 대상으로 운동군 11명, 대조군 11명으로 분류하여 회당 60분씩 주 2회 라인댄스, 1회 저항성운동을 12주간 실시하였다. 운동 수행강도는 운동자각도(RPE)를 이용하여 ‘가볍다’에서 ‘약간 힘들다’ 정도인 11~14 사이를 유지 하였다. 라인댄스와 저항성운동 전·후에 측정한 자료의 그룹 내 차이 비교를 위해 대응표본 T검정, 그룹 간차이는 운동 전·후의 변화량을 산출하여 독립표본 T검정을 실시하였고, 측정변인들에 대한 그룹 및 시기간 상호작용을 검증하기 위해 이원배치 반복측정 분산분석으로 하였으며, 각 항목별 통계적 유의수준은 .05로 설정하였다. 그 결과, 운동군이 신체수행능력 중 균형(p<.05), 보행속도(p<.01), 의자에서 일어서기(p<.001), SPPB 종합점수(p<.001)가 증가하였으며, 골밀도는 요추(L2~L4)골밀도에서 운동군이 유의하게 증가하였고(p<.05), T-score점수는 운동군이 유의한 증가를 보였으나(p<.01), 대조군은 유의한 차이가 나타나지 않았다. PTH수준은 운동군이 유의하게 감소하였고(p<.05), 대조군은 유의한 차이가 나타나지 않았 다. 이상의 결과 규칙적이고 지속적인 신체활동은 여성노인의 신체수행능력, 골밀도 및 부갑상선 호르몬의 변화에 긍정적인 영향을 미친 것으로 사료된다.

The purpose of this study was to investigate the effect of combined exercise training during 12weeks on physical fitness, body composition and bone mineral density in university students. Nineteen male university students who were enrolled of 1st grade at department of physical education in Korea National University of Education were participated in this experiment. Subjects were performed combined exercise training - running, physical training using plyometrics and resistance training - of 5days per week, 70min per 1 time, during 12weeks. The measurement items were health related fitness(muscle strength, muscular endurance, cardiovascular endurance, flexibility), motor skill fitness(power, balance), body composition(% body fat, muscle mass) and bone mineral density(T-score). On the basis of the results analyzed in this study and consideration of many pre studies related it, the result were as follows. First, data analysis of 12 week combined exercise training on health related fitness, post level was revealed more significant increase than pre level at muscle strength(p<.05), muscular endurance(p<.05), cardiovascular endurance(p<.001) and flexibility(p<.05). Second, data analysis of 12 week combined exercise training on motor skill fitness, It was not revealed significant differences between the pre and the post level of the power and balance). Third, data analysis of 12 week combined exercise training on body composition, post level revealed more significant improvement than pre level at muscle mass(p<.05), but It was not revealed significant differences between the pre and the post level of the % body fat. Fourth, data analysis of 12 week combined exercise training on bone mineral density, post level revealed more significant improvement than pre level at T-score(p<.05). In conclusion, It was revealed that 12 week combined exercise training increased physical fitness, and improved body composition and bone mineral density. I hope that more studies will be followed on physical fitness, body composition and bone mineral density on various exercise types, exercise intensity, time and frequency in university students in the future.

The purpose of this study is to examine the changes in bone mineral density in long-stay patients of a geriatric hospital in relation to physical therapy, thereby providing basic data for preventing the onset or deterioration of osteoporosis in inpatients of geriatric hospitals or relevant facilities. The subjects of this study were 133 elderly patients who had been in H geriatric hospital in Yongin-si for more than four years. Their bone mineral density T-scores at admission and those after four years were measured to compare and analyze the changes in bone mineral density in relation to physical therapy. According to the results, the decrease in T-score for the group without physical therapy was greater by .40 than that for the group with physical therapy, indicating a statistically significant difference between the two groups(p<.01). Accordingly, physical therapy proved to be effective in preventing bone mineral density loss and maintaining the current density.

In order to know how the magnetic field increases with density in interstellar clouds, we have analyzed observations of extinction and polarization for stars in the ρ Oph molecular cloud complex. The size of grains in dense parts of the complex is estimated to be larger than the ones in diffuse interstellar clouds by about 15 percent in radii. Employing the Davis-Greenstein mechanism for grain alignment with this estimated grain size, we have put constraints on the exponent in the field-density relation B ∝ n x : 1 / 5 ≤ x ≤ 1 / 3 . It is concluded that magnetic field in gravitationally contracting clouds increases less steeply than the classical expectation based on the approximation of isotropic contraction with complete frozen-in flux.

방사선치료에 사용하는 CT 스캐너에 의해 획득된 CT 및 CBCT 전자밀도팬텀의 CT영상부터 CT수 대 물 리적 밀도 변환에 관한 CT 스캐닝 매개변수의 의존성은 실험으로 분석하였다. CT수는 관전류량, 슬라이스 두께, 영상재구성 필터, 시야 그리고 팬텀 용적의 크기에 대해 의존하지 않았다. 그러나 CT수는 관전압과 팬텀 횡단면적 크기에 의존하였다. 결과로서, 물리적 밀도 1이상의 범위에 대하여, 90과 120 kVp 사이의 관 전압에서 관측된 최대 CT수 차이는 27%이었고, 그리고 CT 몸통과 머리 전자밀도팬텀 사이에서 관측된 최대 CT수 차이는 15%이었다.

This study was carried out to investigate the effect of no-tillage on sequential cropping supported from recycling of first crop ridge on the productivity of crop and physical properties of soil under green house condition. This study is a part of “No-tillage agriculture of Korea-type on recycled ridge”. From results for distribution of soil particle size with time process after tillage, soil particles were composed with granular structure in both tillage and no-tillage. No-tillage soil in distribution of above 2 mm soil particle increased at top soil and subsoil compared with tillage soil. Tillage and one year of no-tillage soil were not a significant difference at above 0.25 mm~below 0.5 mm, above 0.5 mm~below 1.0 mm, and above 1.0 mm of water-stable aggregate. Two years of no-tillage soil was significantly increased by 8.2%, 4.5%, and 1.7% at above 0.25 mm~below 0.5 mm, above 0.5 mm~below 1.0 mm, and above 1.0 mm of water-stable aggregate, respectively, compared with one year of no-tillage. Bulk density of top soil was 1.10 MG m3 at tillage and 1.30 MG m3 at one year of no-tillage. Bulk density of top soil was 1.14 MG m3 at two years and 1.03 MG m3 at three years of no-tillage, respectively. Bulk density of subsoil was a similar tendency. Solid phase ratio in top soil and subsoil was increased at one year of no-tillage compared with tillage soil, while soil phase ratio decreased at two and three years of no-tillage. Pore space ratio in tillage top soil (58.5%) was decreased by 8.5% at compared with no-tillage soil (51.0%). Pore space ratio was 56.9% and 61.2% at two and three years of no-tillage soil, respectively. Subsoil was a similar tendency. Gaseous phase ratio was decreased at one year of no-tillage soil, and increased at two and three years of no-tillage soil compared with tillage soil. Liquid phase ratio in top soil was increased at one year of no-tillage (28.3%), and decreased at two years (23.4%) and at three years (18.3 %) of no-tillage soil compared with tillage soil (24.2%). Subsoil was a similar tendency. Liquid phase ratio in subsoil was increased than top soil.

Waste stone sludge generated during the collection of crushed aggregate is difficult to use due to high moisture content. Production of 1 ton aggregate generates approximately 0.25 tons of waste stone sludge. Considering the total crushed aggregate collection in 2012 of about 100 million tons, it can be estimated that 25 million tons of waste stone sludge is generated annually. Recycling of waste stone sludge is made difficult by the high moisture content of 30%. Therefore, to make recycling this process must be a drying process, which makes a fine powder of even better quality that can use as an additive. The purpose of this study is to analyze the changes in physical properties caused by the use of dried waste stone sludge as an additive in the extrusion of cement. A test specimen was made, substituting 50% of the silica with waste stone sludge, and physical performance evaluation was performed. Results showed that 50% substitution of silica resulted in no difference in moldability, but a slight increase in the water content required for the same workability was found. Flexural strength and drying shrinkage were found to be 97% of normal levels, but satisfied the specified performance in the KS F 4735 standard.

대맥재배에 있어서 재식밀도와 시비량의 차이가 간의 형태적, 생리적 특성의 변화와 수량에 미치는 영향을 구명코저 시험한 결과를 요약하면 다음과 같다. (1) 시비량에 있어서는 표준시구보다 배비구에서 간 내, 외경, 간 벽후가 두꺼우며 단위간 건물중이 높고, 간장이 다소 커지며 수중, 수수가 많았다. (2) 재식밀도에 있어서는 소식일수록 도복에 견딜수 있는 방향으로 변화되었으나, 수량면을 고려하면 5×5cm, 10×10cm 구가 알맞은 편이고 15×15cm구와 20×20cm구는 거의 비슷하였다. (3) 좌절하중, 좌절시 Bending moment, 단면2차 moment, 단면계수등은 표준비구보다 배비구가 높아 도복에 강하며, 재식밀도면에서는 소식일수록 전기형질의 수치가 높았다. (4) 도복지수는 밀식일 경우는 표준비구가 높으며 10×10cm구 이상 소식일 때는 시비량과 재식거리에 따른 도복지수의 차이는 없었다. (5) 수량면에서는 배비가 좋으며, 안전다수를 위한 재식거리는 5×5cm구가 가장 좋았다.